#include "window_manager.h"

#include <string.h>

#include <algorithm>

#include <SDL.h>

#include "color.h"
#include "debug.h"
#include "dinput.h"
#include "draw.h"
#include "input.h"
#include "memory.h"
#include "mouse.h"
#include "palette.h"
#include "pointer_registry.h"
#include "svga.h"
#include "text_font.h"
#include "vcr.h"
#include "win32.h"
#include "window_manager_private.h"

namespace fallout {

#define MAX_WINDOW_COUNT (50)

// The maximum number of radio groups.
#define RADIO_GROUP_LIST_CAPACITY (64)

static void windowFree(int win);
static void _win_buffering(bool a1);
static void _win_move(int win_index, int x, int y);
static void _win_clip(Window* window, RectListNode** rect, unsigned char* a3);
static void _win_drag(int win);
static void _refresh_all(Rect* rect, unsigned char* a2);
static Button* buttonGetButton(int btn, Window** out_win);
static int paletteOpenFileImpl(const char* path, int flags);
static int paletteReadFileImpl(int fd, void* buf, size_t count);
static int paletteCloseFileImpl(int fd);
static Button* buttonCreateInternal(int win, int x, int y, int width, int height, int mouseEnterEventCode, int mouseExitEventCode, int mouseDownEventCode, int mouseUpEventCode, int flags, unsigned char* up, unsigned char* dn, unsigned char* hover);
static int _GNW_check_buttons(Window* window, int* out_a2);
static bool _button_under_mouse(Button* button, Rect* rect);
static void buttonFree(Button* ptr);
static int button_new_id();
static int _win_group_check_buttons(int a1, int* a2, int a3, void (*a4)(int));
static int _button_check_group(Button* button);
static void _button_draw(Button* button, Window* window, unsigned char* data, int a4, Rect* a5, int a6);
static void _GNW_button_refresh(Window* window, Rect* rect);

// 0x50FA30
static char _path_patches[] = "";

// 0x51E3D8
static bool _GNW95_already_running = false;

#ifdef _WIN32
// 0x51E3DC
static HANDLE _GNW95_title_mutex = INVALID_HANDLE_VALUE;
#endif

// 0x51E3E0
bool gWindowSystemInitialized = false;

// 0x51E3E4
int _GNW_wcolor[6] = {
    0,
    0,
    0,
    0,
    0,
    0,
};

// 0x51E3FC
static unsigned char* _screen_buffer = NULL;

// 0x51E400
static bool _insideWinExit = false;

// 0x51E404
static int _last_button_winID = -1;

// 0x6ADD90
static int gWindowIndexes[MAX_WINDOW_COUNT];

// 0x6ADE58
static Window* gWindows[MAX_WINDOW_COUNT];

// 0x6ADF20
static VideoSystemExitProc* gVideoSystemExitProc;

// 0x6ADF24
static int gWindowsLength;

// 0x6ADF28
static int _window_flags;

// 0x6ADF2C
static bool _buffering;

// 0x6ADF30
static int _bk_color;

// 0x6ADF34
static VideoSystemInitProc* gVideoSystemInitProc;

// 0x6ADF38
static int _doing_refresh_all;

// 0x6ADF3C
static void* _GNW_texture;

// 0x6ADF40
static RadioGroup gRadioGroups[RADIO_GROUP_LIST_CAPACITY];

// 0x4D5C30
int windowManagerInit(VideoSystemInitProc* videoSystemInitProc, VideoSystemExitProc* videoSystemExitProc, int a3)
{
#ifdef _WIN32
    CloseHandle(_GNW95_mutex);
    _GNW95_mutex = INVALID_HANDLE_VALUE;
#endif

    if (_GNW95_already_running) {
        return WINDOW_MANAGER_ERR_ALREADY_RUNNING;
    }

#ifdef _WIN32
    if (_GNW95_title_mutex == INVALID_HANDLE_VALUE) {
        return WINDOW_MANAGER_ERR_TITLE_NOT_SET;
    }
#endif

    if (gWindowSystemInitialized) {
        return WINDOW_MANAGER_ERR_WINDOW_SYSTEM_ALREADY_INITIALIZED;
    }

    for (int index = 0; index < MAX_WINDOW_COUNT; index++) {
        gWindowIndexes[index] = -1;
    }

    if (_db_total() == 0) {
        if (dbOpen(NULL, 0, _path_patches, 1) == -1) {
            return WINDOW_MANAGER_ERR_INITIALIZING_DEFAULT_DATABASE;
        }
    }

    if (textFontsInit() == -1) {
        return WINDOW_MANAGER_ERR_INITIALIZING_TEXT_FONTS;
    }

    _get_start_mode_();

    gVideoSystemInitProc = videoSystemInitProc;
    gVideoSystemExitProc = directInputFree;

    int rc = videoSystemInitProc();
    if (rc == -1) {
        if (gVideoSystemExitProc != NULL) {
            gVideoSystemExitProc();
        }

        return WINDOW_MANAGER_ERR_INITIALIZING_VIDEO_MODE;
    }

    if (rc == 8) {
        return WINDOW_MANAGER_ERR_8;
    }

    if (a3 & 1) {
        _screen_buffer = (unsigned char*)internal_malloc((_scr_size.bottom - _scr_size.top + 1) * (_scr_size.right - _scr_size.left + 1));
        if (_screen_buffer == NULL) {
            if (gVideoSystemExitProc != NULL) {
                gVideoSystemExitProc();
            } else {
                directDrawFree();
            }

            return WINDOW_MANAGER_ERR_NO_MEMORY;
        }
    }

    _buffering = false;
    _doing_refresh_all = 0;

    colorPaletteSetFileIO(paletteOpenFileImpl, paletteReadFileImpl, paletteCloseFileImpl);
    colorPaletteSetMemoryProcs(internal_malloc, internal_realloc, internal_free);

    if (!_initColors()) {
        unsigned char* palette = (unsigned char*)internal_malloc(768);
        if (palette == NULL) {
            if (gVideoSystemExitProc != NULL) {
                gVideoSystemExitProc();
            } else {
                directDrawFree();
            }

            if (_screen_buffer != NULL) {
                internal_free(_screen_buffer);
            }

            return WINDOW_MANAGER_ERR_NO_MEMORY;
        }

        bufferFill(palette, 768, 1, 768, 0);

        // TODO: Incomplete.
        // _colorBuildColorTable(_getSystemPalette(), palette);

        internal_free(palette);
    }

    _GNW_debug_init();

    if (inputInit(a3) == -1) {
        return WINDOW_MANAGER_ERR_INITIALIZING_INPUT;
    }

    _GNW_intr_init();

    Window* window = gWindows[0] = (Window*)internal_malloc(sizeof(*window));
    if (window == NULL) {
        if (gVideoSystemExitProc != NULL) {
            gVideoSystemExitProc();
        } else {
            directDrawFree();
        }

        if (_screen_buffer != NULL) {
            internal_free(_screen_buffer);
        }

        return WINDOW_MANAGER_ERR_NO_MEMORY;
    }

    window->id = 0;
    window->flags = 0;
    window->rect.left = _scr_size.left;
    window->rect.top = _scr_size.top;
    window->rect.right = _scr_size.right;
    window->rect.bottom = _scr_size.bottom;
    window->width = _scr_size.right - _scr_size.left + 1;
    window->height = _scr_size.bottom - _scr_size.top + 1;
    window->tx = 0;
    window->ty = 0;
    window->buffer = NULL;
    window->buttonListHead = NULL;
    window->hoveredButton = NULL;
    window->clickedButton = 0;
    window->menuBar = NULL;

    gWindowsLength = 1;
    gWindowSystemInitialized = 1;
    _GNW_wcolor[3] = 21140;
    _GNW_wcolor[4] = 32747;
    _GNW_wcolor[5] = 31744;
    gWindowIndexes[0] = 0;
    _GNW_texture = NULL;
    _bk_color = 0;
    _GNW_wcolor[0] = 10570;
    _window_flags = a3;
    _GNW_wcolor[2] = 8456;
    _GNW_wcolor[1] = 15855;

    atexit(windowManagerExit);

    return WINDOW_MANAGER_OK;
}

// 0x4D616C
void windowManagerExit(void)
{
    if (!_insideWinExit) {
        _insideWinExit = true;
        if (gWindowSystemInitialized) {
            _GNW_intr_exit();

            for (int index = gWindowsLength - 1; index >= 0; index--) {
                windowFree(gWindows[index]->id);
            }

            if (_GNW_texture != NULL) {
                internal_free(_GNW_texture);
            }

            if (_screen_buffer != NULL) {
                internal_free(_screen_buffer);
            }

            if (gVideoSystemExitProc != NULL) {
                gVideoSystemExitProc();
            }

            inputExit();
            _GNW_rect_exit();
            textFontsExit();
            _colorsClose();

            SDL_DestroyWindow(gSdlWindow);

            gWindowSystemInitialized = false;

#ifdef _WIN32
            CloseHandle(_GNW95_title_mutex);
            _GNW95_title_mutex = INVALID_HANDLE_VALUE;
#endif
        }
        _insideWinExit = false;
    }
}

// win_add
// 0x4D6238
int windowCreate(int x, int y, int width, int height, int color, int flags)
{
    int v23;
    int v25, v26;
    Window* tmp;

    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (gWindowsLength == MAX_WINDOW_COUNT) {
        return -1;
    }

    if (width > rectGetWidth(&_scr_size)) {
        return -1;
    }

    if (height > rectGetHeight(&_scr_size)) {
        return -1;
    }

    Window* window = gWindows[gWindowsLength] = (Window*)internal_malloc(sizeof(*window));
    if (window == NULL) {
        return -1;
    }

    window->buffer = (unsigned char*)internal_malloc(width * height);
    if (window->buffer == NULL) {
        internal_free(window);
        return -1;
    }

    int id = 1;
    while (windowGetWindow(id) != NULL) {
        id++;
    }

    window->id = id;

    if ((flags & WINDOW_USE_DEFAULTS) != 0) {
        flags |= _window_flags;
    }

    window->width = width;
    window->height = height;
    window->flags = flags;
    window->tx = rand() & 0xFFFE;
    window->ty = rand() & 0xFFFE;

    if (color == 256) {
        if (_GNW_texture == NULL) {
            color = _colorTable[_GNW_wcolor[0]];
        }
    } else if ((color & 0xFF00) != 0) {
        int colorIndex = (color & 0xFF) - 1;
        color = (color & ~0xFFFF) | _colorTable[_GNW_wcolor[colorIndex]];
    }

    window->buttonListHead = NULL;
    window->hoveredButton = NULL;
    window->clickedButton = NULL;
    window->menuBar = NULL;
    window->blitProc = blitBufferToBufferTrans;
    window->color = color;
    gWindowIndexes[id] = gWindowsLength;
    gWindowsLength++;

    windowFill(id, 0, 0, width, height, color);

    window->flags |= WINDOW_HIDDEN;
    _win_move(id, x, y);
    window->flags = flags;

    if ((flags & WINDOW_MOVE_ON_TOP) == 0) {
        v23 = gWindowsLength - 2;
        while (v23 > 0) {
            if (!(gWindows[v23]->flags & WINDOW_MOVE_ON_TOP)) {
                break;
            }
            v23--;
        }

        if (v23 != gWindowsLength - 2) {
            v25 = v23 + 1;
            v26 = gWindowsLength - 1;
            while (v26 > v25) {
                tmp = gWindows[v26 - 1];
                gWindows[v26] = tmp;
                gWindowIndexes[tmp->id] = v26;
                v26--;
            }

            gWindows[v25] = window;
            gWindowIndexes[id] = v25;
        }
    }

    return id;
}

// win_remove
// 0x4D6468
void windowDestroy(int win)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    Rect rect;
    rectCopy(&rect, &(window->rect));

    int v1 = gWindowIndexes[window->id];
    windowFree(win);

    gWindowIndexes[win] = -1;

    for (int index = v1; index < gWindowsLength - 1; index++) {
        gWindows[index] = gWindows[index + 1];
        gWindowIndexes[gWindows[index]->id] = index;
    }

    gWindowsLength--;

    // NOTE: Uninline.
    windowRefreshAll(&rect);
}

// 0x4D650C
void windowFree(int win)
{
    Window* window = windowGetWindow(win);
    if (window == NULL) {
        return;
    }

    if (window->buffer != NULL) {
        internal_free(window->buffer);
    }

    if (window->menuBar != NULL) {
        internal_free(window->menuBar);
    }

    Button* curr = window->buttonListHead;
    while (curr != NULL) {
        Button* next = curr->next;
        buttonFree(curr);
        curr = next;
    }

    internal_free(window);
}

// 0x4D6558
void _win_buffering(bool a1)
{
    if (_screen_buffer != NULL) {
        _buffering = a1;
    }
}

// 0x4D6568
void windowDrawBorder(int win)
{
    if (!gWindowSystemInitialized) {
        return;
    }

    Window* window = windowGetWindow(win);
    if (window == NULL) {
        return;
    }

    _lighten_buf(window->buffer + 5, window->width - 10, 5, window->width);
    _lighten_buf(window->buffer, 5, window->height, window->width);
    _lighten_buf(window->buffer + window->width - 5, 5, window->height, window->width);
    _lighten_buf(window->buffer + window->width * (window->height - 5) + 5, window->width - 10, 5, window->width);

    bufferDrawRect(window->buffer, window->width, 0, 0, window->width - 1, window->height - 1, _colorTable[0]);

    bufferDrawRectShadowed(window->buffer, window->width, 1, 1, window->width - 2, window->height - 2, _colorTable[_GNW_wcolor[1]], _colorTable[_GNW_wcolor[2]]);
    bufferDrawRectShadowed(window->buffer, window->width, 5, 5, window->width - 6, window->height - 6, _colorTable[_GNW_wcolor[2]], _colorTable[_GNW_wcolor[1]]);
}

// 0x4D684C
void windowDrawText(int win, const char* str, int a3, int x, int y, int a6)
{
    int v7;
    int v14;
    unsigned char* buf;
    int v27;

    Window* window = windowGetWindow(win);
    v7 = a3;

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    if (a3 == 0) {
        if (a6 & 0x040000) {
            v7 = fontGetMonospacedStringWidth(str);
        } else {
            v7 = fontGetStringWidth(str);
        }
    }

    if (v7 + x > window->width) {
        if (!(a6 & 0x04000000)) {
            return;
        }

        v7 = window->width - x;
    }

    buf = window->buffer + x + y * window->width;

    v14 = fontGetLineHeight();
    if (v14 + y > window->height) {
        return;
    }

    if (!(a6 & 0x02000000)) {
        if (window->color == 256 && _GNW_texture != NULL) {
            _buf_texture(buf, v7, fontGetLineHeight(), window->width, _GNW_texture, window->tx + x, window->ty + y);
        } else {
            bufferFill(buf, v7, fontGetLineHeight(), window->width, window->color);
        }
    }

    if (a6 & 0xFF00) {
        int t = (a6 & 0xFF00) >> 8;
        v27 = (a6 & ~0xFFFF) | _colorTable[_GNW_wcolor[t]];
    } else {
        v27 = a6;
    }

    fontDrawText(buf, str, v7, window->width, v27);

    if (a6 & 0x01000000) {
        // TODO: Check.
        Rect rect;
        rect.left = window->rect.left + x;
        rect.top = window->rect.top + y;
        rect.right = rect.left + v7;
        rect.bottom = rect.top + fontGetLineHeight();
        _GNW_win_refresh(window, &rect, NULL);
    }
}

// 0x4D6B24
void windowDrawLine(int win, int left, int top, int right, int bottom, int color)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    if (color & 0xFF00) {
        int t = (color & 0xFF00) >> 8;
        color = (color & ~0xFFFF) | _colorTable[_GNW_wcolor[t]];
    }

    bufferDrawLine(window->buffer, window->width, left, top, right, bottom, color);
}

// 0x4D6B88
void windowDrawRect(int win, int left, int top, int right, int bottom, int color)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    if ((color & 0xFF00) != 0) {
        int v1 = (color & 0xFF00) >> 8;
        color = (color & ~0xFFFF) | _colorTable[_GNW_wcolor[v1]];
    }

    if (right < left) {
        int tmp = left;
        left = right;
        right = tmp;
    }

    if (bottom < top) {
        int tmp = top;
        top = bottom;
        bottom = tmp;
    }

    bufferDrawRect(window->buffer, window->width, left, top, right, bottom, color);
}

// 0x4D6CC8
void windowFill(int win, int x, int y, int width, int height, int a6)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    if (a6 == 256) {
        if (_GNW_texture != NULL) {
            _buf_texture(window->buffer + window->width * y + x, width, height, window->width, _GNW_texture, x + window->tx, y + window->ty);
        } else {
            a6 = _colorTable[_GNW_wcolor[0]] & 0xFF;
        }
    } else if ((a6 & 0xFF00) != 0) {
        int v1 = (a6 & 0xFF00) >> 8;
        a6 = (a6 & ~0xFFFF) | _colorTable[_GNW_wcolor[v1]];
    }

    if (a6 < 256) {
        bufferFill(window->buffer + window->width * y + x, width, height, window->width, a6);
    }
}

// 0x4D6DAC
void windowUnhide(int win)
{
    Window* window;
    int v3;
    int v5;
    int v7;
    Window* v6;

    window = windowGetWindow(win);
    v3 = gWindowIndexes[window->id];

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window->flags & WINDOW_HIDDEN) {
        window->flags &= ~WINDOW_HIDDEN;
        if (v3 == gWindowsLength - 1) {
            _GNW_win_refresh(window, &(window->rect), NULL);
        }
    }

    v5 = gWindowsLength - 1;
    if (v3 < v5 && !(window->flags & WINDOW_DONT_MOVE_TOP)) {
        v7 = v3;
        while (v3 < v5 && ((window->flags & WINDOW_MOVE_ON_TOP) || !(gWindows[v7 + 1]->flags & WINDOW_MOVE_ON_TOP))) {
            v6 = gWindows[v7 + 1];
            gWindows[v7] = v6;
            v7++;
            gWindowIndexes[v6->id] = v3++;
        }

        gWindows[v3] = window;
        gWindowIndexes[window->id] = v3;
        _GNW_win_refresh(window, &(window->rect), NULL);
    }
}

// 0x4D6E64
void windowHide(int win)
{
    if (!gWindowSystemInitialized) {
        return;
    }

    Window* window = windowGetWindow(win);
    if (window == NULL) {
        return;
    }

    if ((window->flags & WINDOW_HIDDEN) == 0) {
        window->flags |= WINDOW_HIDDEN;
        _refresh_all(&(window->rect), NULL);
    }
}

// 0x4D6EA0
void _win_move(int win, int x, int y)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    Rect rect;
    rectCopy(&rect, &(window->rect));

    if (x < 0) {
        x = 0;
    }

    if (y < 0) {
        y = 0;
    }

    if ((window->flags & WINDOW_MANAGED) != 0) {
        x += 2;
    }

    if (x + window->width - 1 > _scr_size.right) {
        x = _scr_size.right - window->width + 1;
    }

    if (y + window->height - 1 > _scr_size.bottom) {
        y = _scr_size.bottom - window->height + 1;
    }

    if ((window->flags & WINDOW_MANAGED) != 0) {
        // TODO: Not sure what this means.
        x &= ~0x03;
    }

    window->rect.left = x;
    window->rect.top = y;
    window->rect.right = window->width + x - 1;
    window->rect.bottom = window->height + y - 1;

    if ((window->flags & WINDOW_HIDDEN) == 0) {
        _GNW_win_refresh(window, &(window->rect), NULL);

        if (gWindowSystemInitialized) {
            _refresh_all(&rect, NULL);
        }
    }
}

// 0x4D6F5C
void windowRefresh(int win)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    _GNW_win_refresh(window, &(window->rect), NULL);
}

// 0x4D6F80
void windowRefreshRect(int win, const Rect* rect)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    Rect newRect;
    rectCopy(&newRect, rect);
    rectOffset(&newRect, window->rect.left, window->rect.top);

    _GNW_win_refresh(window, &newRect, NULL);
}

// 0x4D6FD8
void _GNW_win_refresh(Window* window, Rect* rect, unsigned char* a3)
{
    RectListNode *v26, *v20, *v23, *v24;
    int dest_pitch;

    // TODO: Get rid of this.
    dest_pitch = 0;

    if ((window->flags & WINDOW_HIDDEN) != 0) {
        return;
    }

    if ((window->flags & WINDOW_TRANSPARENT) && _buffering && !_doing_refresh_all) {
        // TODO: Incomplete.
    } else {
        v26 = _rect_malloc();
        if (v26 == NULL) {
            return;
        }

        v26->next = NULL;

        v26->rect.left = std::max(window->rect.left, rect->left);
        v26->rect.top = std::max(window->rect.top, rect->top);
        v26->rect.right = std::min(window->rect.right, rect->right);
        v26->rect.bottom = std::min(window->rect.bottom, rect->bottom);

        if (v26->rect.right >= v26->rect.left && v26->rect.bottom >= v26->rect.top) {
            if (a3) {
                dest_pitch = rect->right - rect->left + 1;
            }

            _win_clip(window, &v26, a3);

            if (window->id) {
                v20 = v26;
                while (v20) {
                    _GNW_button_refresh(window, &(v20->rect));

                    if (a3) {
                        if (_buffering && (window->flags & WINDOW_TRANSPARENT)) {
                            window->blitProc(window->buffer + v20->rect.left - window->rect.left + (v20->rect.top - window->rect.top) * window->width,
                                v20->rect.right - v20->rect.left + 1,
                                v20->rect.bottom - v20->rect.top + 1,
                                window->width,
                                a3 + dest_pitch * (v20->rect.top - rect->top) + v20->rect.left - rect->left,
                                dest_pitch);
                        } else {
                            blitBufferToBuffer(
                                window->buffer + v20->rect.left - window->rect.left + (v20->rect.top - window->rect.top) * window->width,
                                v20->rect.right - v20->rect.left + 1,
                                v20->rect.bottom - v20->rect.top + 1,
                                window->width,
                                a3 + dest_pitch * (v20->rect.top - rect->top) + v20->rect.left - rect->left,
                                dest_pitch);
                        }
                    } else {
                        if (_buffering) {
                            if (window->flags & WINDOW_TRANSPARENT) {
                                window->blitProc(
                                    window->buffer + v20->rect.left - window->rect.left + (v20->rect.top - window->rect.top) * window->width,
                                    v20->rect.right - v20->rect.left + 1,
                                    v20->rect.bottom - v20->rect.top + 1,
                                    window->width,
                                    _screen_buffer + v20->rect.top * (_scr_size.right - _scr_size.left + 1) + v20->rect.left,
                                    _scr_size.right - _scr_size.left + 1);
                            } else {
                                blitBufferToBuffer(
                                    window->buffer + v20->rect.left - window->rect.left + (v20->rect.top - window->rect.top) * window->width,
                                    v20->rect.right - v20->rect.left + 1,
                                    v20->rect.bottom - v20->rect.top + 1,
                                    window->width,
                                    _screen_buffer + v20->rect.top * (_scr_size.right - _scr_size.left + 1) + v20->rect.left,
                                    _scr_size.right - _scr_size.left + 1);
                            }
                        } else {
                            _scr_blit(
                                window->buffer + v20->rect.left - window->rect.left + (v20->rect.top - window->rect.top) * window->width,
                                window->width,
                                v20->rect.bottom - v20->rect.bottom + 1,
                                0,
                                0,
                                v20->rect.right - v20->rect.left + 1,
                                v20->rect.bottom - v20->rect.top + 1,
                                v20->rect.left,
                                v20->rect.top);
                        }
                    }

                    v20 = v20->next;
                }
            } else {
                RectListNode* v16 = v26;
                while (v16 != NULL) {
                    int width = v16->rect.right - v16->rect.left + 1;
                    int height = v16->rect.bottom - v16->rect.top + 1;
                    unsigned char* buf = (unsigned char*)internal_malloc(width * height);
                    if (buf != NULL) {
                        bufferFill(buf, width, height, width, _bk_color);
                        if (dest_pitch != 0) {
                            blitBufferToBuffer(
                                buf,
                                width,
                                height,
                                width,
                                a3 + dest_pitch * (v16->rect.top - rect->top) + v16->rect.left - rect->left,
                                dest_pitch);
                        } else {
                            if (_buffering) {
                                blitBufferToBuffer(buf,
                                    width,
                                    height,
                                    width,
                                    _screen_buffer + v16->rect.top * (_scr_size.right - _scr_size.left + 1) + v16->rect.left,
                                    _scr_size.right - _scr_size.left + 1);
                            } else {
                                _scr_blit(buf, width, height, 0, 0, width, height, v16->rect.left, v16->rect.top);
                            }
                        }

                        internal_free(buf);
                    }
                    v16 = v16->next;
                }
            }

            v23 = v26;
            while (v23) {
                v24 = v23->next;

                if (_buffering && !a3) {
                    _scr_blit(
                        _screen_buffer + v23->rect.left + (_scr_size.right - _scr_size.left + 1) * v23->rect.top,
                        _scr_size.right - _scr_size.left + 1,
                        v23->rect.bottom - v23->rect.top + 1,
                        0,
                        0,
                        v23->rect.right - v23->rect.left + 1,
                        v23->rect.bottom - v23->rect.top + 1,
                        v23->rect.left,
                        v23->rect.top);
                }

                _rect_free(v23);

                v23 = v24;
            }

            if (!_doing_refresh_all && a3 == NULL && cursorIsHidden() == 0) {
                if (_mouse_in(rect->left, rect->top, rect->right, rect->bottom)) {
                    mouseShowCursor();
                }
            }
        } else {
            _rect_free(v26);
        }
    }
}

// 0x4D759C
void windowRefreshAll(Rect* rect)
{
    if (gWindowSystemInitialized) {
        _refresh_all(rect, NULL);
    }
}

// 0x4D75B0
void _win_clip(Window* window, RectListNode** rectListNodePtr, unsigned char* a3)
{
    for (int index = gWindowIndexes[window->id] + 1; index < gWindowsLength; index++) {
        if (*rectListNodePtr == NULL) {
            break;
        }

        Window* window = gWindows[index];
        if (!(window->flags & WINDOW_HIDDEN)) {
            if (!_buffering || !(window->flags & WINDOW_TRANSPARENT)) {
                _rect_clip_list(rectListNodePtr, &(window->rect));
            } else {
                if (!_doing_refresh_all) {
                    _GNW_win_refresh(window, &(window->rect), NULL);
                    _rect_clip_list(rectListNodePtr, &(window->rect));
                }
            }
        }
    }

    if (a3 == _screen_buffer || a3 == NULL) {
        if (cursorIsHidden() == 0) {
            Rect rect;
            mouseGetRect(&rect);
            _rect_clip_list(rectListNodePtr, &rect);
        }
    }
}

// 0x4D765C
void _win_drag(int win)
{
    // TODO: Probably somehow related to self-run functionality, skip for now.
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    windowUnhide(win);

    Rect rect;
    rectCopy(&rect, &(window->rect));

    tickersExecute();

    if (vcrUpdate() != 3) {
        _mouse_info();
    }

    if ((window->flags & WINDOW_MANAGED) && (window->rect.left & 3)) {
        _win_move(window->id, window->rect.left, window->rect.top);
    }
}

// 0x4D77F8
void _win_get_mouse_buf(unsigned char* a1)
{
    Rect rect;
    mouseGetRect(&rect);
    _refresh_all(&rect, a1);
}

// 0x4D7814
void _refresh_all(Rect* rect, unsigned char* a2)
{
    _doing_refresh_all = 1;

    for (int index = 0; index < gWindowsLength; index++) {
        _GNW_win_refresh(gWindows[index], rect, a2);
    }

    _doing_refresh_all = 0;

    if (a2 == NULL) {
        if (!cursorIsHidden()) {
            if (_mouse_in(rect->left, rect->top, rect->right, rect->bottom)) {
                mouseShowCursor();
            }
        }
    }
}

// 0x4D7888
Window* windowGetWindow(int win)
{
    if (win == -1) {
        return NULL;
    }

    int index = gWindowIndexes[win];
    if (index == -1) {
        return NULL;
    }

    return gWindows[index];
}

// win_get_buf
// 0x4D78B0
unsigned char* windowGetBuffer(int win)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return NULL;
    }

    if (window == NULL) {
        return NULL;
    }

    return window->buffer;
}

// 0x4D78CC
int windowGetAtPoint(int x, int y)
{
    for (int index = gWindowsLength - 1; index >= 0; index--) {
        Window* window = gWindows[index];
        if (x >= window->rect.left && x <= window->rect.right
            && y >= window->rect.top && y <= window->rect.bottom) {
            return window->id;
        }
    }

    return -1;
}

// 0x4D7918
int windowGetWidth(int win)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (window == NULL) {
        return -1;
    }

    return window->width;
}

// 0x4D7934
int windowGetHeight(int win)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (window == NULL) {
        return -1;
    }

    return window->height;
}

// win_get_rect
// 0x4D7950
int windowGetRect(int win, Rect* rect)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (window == NULL) {
        return -1;
    }

    rectCopy(rect, &(window->rect));

    return 0;
}

// 0x4D797C
int _win_check_all_buttons()
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    int v1 = -1;
    for (int index = gWindowsLength - 1; index >= 1; index--) {
        if (_GNW_check_buttons(gWindows[index], &v1) == 0) {
            break;
        }

        if ((gWindows[index]->flags & WINDOW_MODAL) != 0) {
            break;
        }
    }

    return v1;
}

// 0x4D79DC
Button* buttonGetButton(int btn, Window** windowPtr)
{
    for (int index = 0; index < gWindowsLength; index++) {
        Window* window = gWindows[index];
        Button* button = window->buttonListHead;
        while (button != NULL) {
            if (button->id == btn) {
                if (windowPtr != NULL) {
                    *windowPtr = window;
                }

                return button;
            }
            button = button->next;
        }
    }

    return NULL;
}

// 0x4D7A34
int _GNW_check_menu_bars(int a1)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    int v1 = a1;
    for (int index = gWindowsLength - 1; index >= 1; index--) {
        Window* window = gWindows[index];
        if (window->menuBar != NULL) {
            for (int pulldownIndex = 0; pulldownIndex < window->menuBar->pulldownsLength; pulldownIndex++) {
                if (v1 == window->menuBar->pulldowns[pulldownIndex].keyCode) {
                    v1 = _GNW_process_menu(window->menuBar, pulldownIndex);
                    break;
                }
            }
        }

        if ((window->flags & WINDOW_MODAL) != 0) {
            break;
        }
    }

    return v1;
}

// 0x4D69DC
void _win_text(int win, char** fileNameList, int fileNameListLength, int maxWidth, int x, int y, int flags)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return;
    }

    if (window == NULL) {
        return;
    }

    int width = window->width;
    unsigned char* ptr = window->buffer + y * width + x;
    int lineHeight = fontGetLineHeight();

    int step = width * lineHeight;
    int v1 = lineHeight / 2;
    int v2 = v1 + 1;
    int v3 = maxWidth - 1;

    for (int index = 0; index < fileNameListLength; index++) {
        char* fileName = fileNameList[index];
        if (*fileName != '\0') {
            windowDrawText(win, fileName, maxWidth, x, y, flags);
        } else {
            if (maxWidth != 0) {
                bufferDrawLine(ptr, width, 0, v1, v3, v1, _colorTable[_GNW_wcolor[2]]);
                bufferDrawLine(ptr, width, 0, v2, v3, v2, _colorTable[_GNW_wcolor[1]]);
            }
        }

        ptr += step;
        y += lineHeight;
    }
}

// 0x4D80D8
void programWindowSetTitle(const char* title)
{
    if (title == NULL) {
        return;
    }

#ifdef _WIN32
    if (_GNW95_title_mutex == INVALID_HANDLE_VALUE) {
        _GNW95_title_mutex = CreateMutexA(NULL, TRUE, title);
        if (GetLastError() != ERROR_SUCCESS) {
            _GNW95_already_running = true;
            return;
        }
    }
#endif

    strncpy(gProgramWindowTitle, title, 256);
    gProgramWindowTitle[256 - 1] = '\0';

    if (gSdlWindow != nullptr) {
        SDL_SetWindowTitle(gSdlWindow, gProgramWindowTitle);
    }
}

// [open] implementation for palette operations backed by [XFile].
//
// 0x4D8174
int paletteOpenFileImpl(const char* path, int flags)
{
    char mode[4];
    memset(mode, 0, sizeof(mode));

    if ((flags & 0x01) != 0) {
        mode[0] = 'w';
    } else if ((flags & 0x10) != 0) {
        mode[0] = 'a';
    } else {
        mode[0] = 'r';
    }

    if ((flags & 0x100) != 0) {
        mode[1] = 't';
    } else if ((flags & 0x200) != 0) {
        mode[1] = 'b';
    }

    File* stream = fileOpen(path, mode);
    if (stream != NULL) {
        return ptrToInt(stream);
    }

    return -1;
}

// [read] implementation for palette file operations backed by [XFile].
//
// 0x4D81E8
int paletteReadFileImpl(int fd, void* buf, size_t count)
{
    return fileRead(buf, 1, count, (File*)intToPtr(fd));
}

// [close] implementation for palette file operations backed by [XFile].
//
// 0x4D81E0
int paletteCloseFileImpl(int fd)
{
    return fileClose((File*)intToPtr(fd));
}

// 0x4D8200
bool showMesageBox(const char* text)
{
    SDL_Cursor* prev = SDL_GetCursor();
    SDL_Cursor* cursor = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
    SDL_SetCursor(cursor);
    SDL_ShowCursor(SDL_ENABLE);
    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, NULL, text, NULL);
    SDL_ShowCursor(SDL_DISABLE);
    SDL_SetCursor(prev);
    SDL_FreeCursor(cursor);
    return true;
}

// 0x4D8260
int buttonCreate(int win, int x, int y, int width, int height, int mouseEnterEventCode, int mouseExitEventCode, int mouseDownEventCode, int mouseUpEventCode, unsigned char* up, unsigned char* dn, unsigned char* hover, int flags)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (window == NULL) {
        return -1;
    }

    if (up == NULL && (dn != NULL || hover != NULL)) {
        return -1;
    }

    Button* button = buttonCreateInternal(win, x, y, width, height, mouseEnterEventCode, mouseExitEventCode, mouseDownEventCode, mouseUpEventCode, flags | BUTTON_FLAG_0x010000, up, dn, hover);
    if (button == NULL) {
        return -1;
    }

    _button_draw(button, window, button->normalImage, 0, NULL, 0);

    return button->id;
}

// 0x4D8308
int _win_register_text_button(int win, int x, int y, int mouseEnterEventCode, int mouseExitEventCode, int mouseDownEventCode, int mouseUpEventCode, const char* title, int flags)
{
    Window* window = windowGetWindow(win);

    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (window == NULL) {
        return -1;
    }

    int buttonWidth = fontGetStringWidth(title) + 16;
    int buttonHeight = fontGetLineHeight() + 7;
    unsigned char* normal = (unsigned char*)internal_malloc(buttonWidth * buttonHeight);
    if (normal == NULL) {
        return -1;
    }

    unsigned char* pressed = (unsigned char*)internal_malloc(buttonWidth * buttonHeight);
    if (pressed == NULL) {
        internal_free(normal);
        return -1;
    }

    if (window->color == 256 && _GNW_texture != NULL) {
        // TODO: Incomplete.
    } else {
        bufferFill(normal, buttonWidth, buttonHeight, buttonWidth, window->color);
        bufferFill(pressed, buttonWidth, buttonHeight, buttonWidth, window->color);
    }

    _lighten_buf(normal, buttonWidth, buttonHeight, buttonWidth);

    fontDrawText(normal + buttonWidth * 3 + 8, title, buttonWidth, buttonWidth, _colorTable[_GNW_wcolor[3]]);
    bufferDrawRectShadowed(normal,
        buttonWidth,
        2,
        2,
        buttonWidth - 3,
        buttonHeight - 3,
        _colorTable[_GNW_wcolor[1]],
        _colorTable[_GNW_wcolor[2]]);
    bufferDrawRectShadowed(normal,
        buttonWidth,
        1,
        1,
        buttonWidth - 2,
        buttonHeight - 2,
        _colorTable[_GNW_wcolor[1]],
        _colorTable[_GNW_wcolor[2]]);
    bufferDrawRect(normal, buttonWidth, 0, 0, buttonWidth - 1, buttonHeight - 1, _colorTable[0]);

    fontDrawText(pressed + buttonWidth * 4 + 9, title, buttonWidth, buttonWidth, _colorTable[_GNW_wcolor[3]]);
    bufferDrawRectShadowed(pressed,
        buttonWidth,
        2,
        2,
        buttonWidth - 3,
        buttonHeight - 3,
        _colorTable[_GNW_wcolor[2]],
        _colorTable[_GNW_wcolor[1]]);
    bufferDrawRectShadowed(pressed,
        buttonWidth,
        1,
        1,
        buttonWidth - 2,
        buttonHeight - 2,
        _colorTable[_GNW_wcolor[2]],
        _colorTable[_GNW_wcolor[1]]);
    bufferDrawRect(pressed, buttonWidth, 0, 0, buttonWidth - 1, buttonHeight - 1, _colorTable[0]);

    Button* button = buttonCreateInternal(win,
        x,
        y,
        buttonWidth,
        buttonHeight,
        mouseEnterEventCode,
        mouseExitEventCode,
        mouseDownEventCode,
        mouseUpEventCode,
        flags,
        normal,
        pressed,
        NULL);
    if (button == NULL) {
        internal_free(normal);
        internal_free(pressed);
        return -1;
    }

    _button_draw(button, window, button->normalImage, 0, NULL, 0);

    return button->id;
}

// 0x4D8674
int _win_register_button_disable(int btn, unsigned char* up, unsigned char* down, unsigned char* hover)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Button* button = buttonGetButton(btn, NULL);
    if (button == NULL) {
        return -1;
    }

    button->disabledNormalImage = up;
    button->disabledPressedImage = down;
    button->disabledHoverImage = hover;

    return 0;
}

// 0x4D86A8
int _win_register_button_image(int btn, unsigned char* up, unsigned char* down, unsigned char* hover, int a5)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (up == NULL && (down != NULL || hover != NULL)) {
        return -1;
    }

    Window* window;
    Button* button = buttonGetButton(btn, &window);
    if (button == NULL) {
        return -1;
    }

    if (!(button->flags & BUTTON_FLAG_0x010000)) {
        return -1;
    }

    unsigned char* data = button->currentImage;
    if (data == button->normalImage) {
        button->currentImage = up;
    } else if (data == button->pressedImage) {
        button->currentImage = down;
    } else if (data == button->hoverImage) {
        button->currentImage = hover;
    }

    button->normalImage = up;
    button->pressedImage = down;
    button->hoverImage = hover;

    _button_draw(button, window, button->currentImage, a5, NULL, 0);

    return 0;
}

// Sets primitive callbacks on the button.
//
// 0x4D8758
int buttonSetMouseCallbacks(int btn, ButtonCallback* mouseEnterProc, ButtonCallback* mouseExitProc, ButtonCallback* mouseDownProc, ButtonCallback* mouseUpProc)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Button* button = buttonGetButton(btn, NULL);
    if (button == NULL) {
        return -1;
    }

    button->mouseEnterProc = mouseEnterProc;
    button->mouseExitProc = mouseExitProc;
    button->leftMouseDownProc = mouseDownProc;
    button->leftMouseUpProc = mouseUpProc;

    return 0;
}

// 0x4D8798
int buttonSetRightMouseCallbacks(int btn, int rightMouseDownEventCode, int rightMouseUpEventCode, ButtonCallback* rightMouseDownProc, ButtonCallback* rightMouseUpProc)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Button* button = buttonGetButton(btn, NULL);
    if (button == NULL) {
        return -1;
    }

    button->rightMouseDownEventCode = rightMouseDownEventCode;
    button->rightMouseUpEventCode = rightMouseUpEventCode;
    button->rightMouseDownProc = rightMouseDownProc;
    button->rightMouseUpProc = rightMouseUpProc;

    if (rightMouseDownEventCode != -1 || rightMouseUpEventCode != -1 || rightMouseDownProc != NULL || rightMouseUpProc != NULL) {
        button->flags |= BUTTON_FLAG_RIGHT_MOUSE_BUTTON_CONFIGURED;
    } else {
        button->flags &= ~BUTTON_FLAG_RIGHT_MOUSE_BUTTON_CONFIGURED;
    }

    return 0;
}

// Sets button state callbacks.
// [a2] - when button is transitioning to pressed state
// [a3] - when button is returned to unpressed state
//
// The changes in the state are tied to graphical state, therefore these callbacks are not generated for
// buttons with no graphics.
//
// These callbacks can be triggered several times during tracking if mouse leaves button's rectangle without releasing mouse buttons.
//
// 0x4D87F8
int buttonSetCallbacks(int btn, ButtonCallback* onPressed, ButtonCallback* onUnpressed)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Button* button = buttonGetButton(btn, NULL);
    if (button == NULL) {
        return -1;
    }

    button->onPressed = onPressed;
    button->onUnpressed = onUnpressed;

    return 0;
}

// 0x4D8828
int buttonSetMask(int btn, unsigned char* mask)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Button* button = buttonGetButton(btn, NULL);
    if (button == NULL) {
        return -1;
    }

    button->mask = mask;

    return 0;
}

// 0x4D8854
Button* buttonCreateInternal(int win, int x, int y, int width, int height, int mouseEnterEventCode, int mouseExitEventCode, int mouseDownEventCode, int mouseUpEventCode, int flags, unsigned char* up, unsigned char* dn, unsigned char* hover)
{
    Window* window = windowGetWindow(win);
    if (window == NULL) {
        return NULL;
    }

    Button* button = (Button*)internal_malloc(sizeof(*button));
    if (button == NULL) {
        return NULL;
    }

    if ((flags & BUTTON_FLAG_0x01) == 0) {
        if ((flags & BUTTON_FLAG_0x02) != 0) {
            flags &= ~BUTTON_FLAG_0x02;
        }

        if ((flags & BUTTON_FLAG_0x04) != 0) {
            flags &= ~BUTTON_FLAG_0x04;
        }
    }

    // NOTE: Uninline.
    int buttonId = button_new_id();

    button->id = buttonId;
    button->flags = flags;
    button->rect.left = x;
    button->rect.top = y;
    button->rect.right = x + width - 1;
    button->rect.bottom = y + height - 1;
    button->mouseEnterEventCode = mouseEnterEventCode;
    button->mouseExitEventCode = mouseExitEventCode;
    button->lefMouseDownEventCode = mouseDownEventCode;
    button->leftMouseUpEventCode = mouseUpEventCode;
    button->rightMouseDownEventCode = -1;
    button->rightMouseUpEventCode = -1;
    button->normalImage = up;
    button->pressedImage = dn;
    button->hoverImage = hover;
    button->disabledNormalImage = NULL;
    button->disabledPressedImage = NULL;
    button->disabledHoverImage = NULL;
    button->currentImage = NULL;
    button->mask = NULL;
    button->mouseEnterProc = NULL;
    button->mouseExitProc = NULL;
    button->leftMouseDownProc = NULL;
    button->leftMouseUpProc = NULL;
    button->rightMouseDownProc = NULL;
    button->rightMouseUpProc = NULL;
    button->onPressed = NULL;
    button->onUnpressed = NULL;
    button->radioGroup = NULL;
    button->prev = NULL;

    button->next = window->buttonListHead;
    if (button->next != NULL) {
        button->next->prev = button;
    }
    window->buttonListHead = button;

    return button;
}

// 0x4D89E4
bool _win_button_down(int btn)
{
    if (!gWindowSystemInitialized) {
        return false;
    }

    Button* button = buttonGetButton(btn, NULL);
    if (button == NULL) {
        return false;
    }

    if ((button->flags & BUTTON_FLAG_0x01) != 0 && (button->flags & BUTTON_FLAG_0x020000) != 0) {
        return true;
    }

    return false;
}

// 0x4D8A10
int _GNW_check_buttons(Window* window, int* keyCodePtr)
{
    Rect v58;
    Button* prevHoveredButton;
    Button* prevClickedButton;
    Button* button;

    if ((window->flags & WINDOW_HIDDEN) != 0) {
        return -1;
    }

    button = window->buttonListHead;
    prevHoveredButton = window->hoveredButton;
    prevClickedButton = window->clickedButton;

    if (prevHoveredButton != NULL) {
        rectCopy(&v58, &(prevHoveredButton->rect));
        rectOffset(&v58, window->rect.left, window->rect.top);
    } else if (prevClickedButton != NULL) {
        rectCopy(&v58, &(prevClickedButton->rect));
        rectOffset(&v58, window->rect.left, window->rect.top);
    }

    *keyCodePtr = -1;

    if (_mouse_click_in(window->rect.left, window->rect.top, window->rect.right, window->rect.bottom)) {
        int mouseEvent = mouseGetEvent();
        if ((window->flags & WINDOW_FLAG_0x40) || (mouseEvent & MOUSE_EVENT_LEFT_BUTTON_DOWN) == 0) {
            if (mouseEvent == 0) {
                window->clickedButton = NULL;
            }
        } else {
            windowUnhide(window->id);
        }

        if (prevHoveredButton != NULL) {
            if (!_button_under_mouse(prevHoveredButton, &v58)) {
                if (!(prevHoveredButton->flags & BUTTON_FLAG_DISABLED)) {
                    *keyCodePtr = prevHoveredButton->mouseExitEventCode;
                }

                if ((prevHoveredButton->flags & BUTTON_FLAG_0x01) && (prevHoveredButton->flags & BUTTON_FLAG_0x020000)) {
                    _button_draw(prevHoveredButton, window, prevHoveredButton->pressedImage, 1, NULL, 1);
                } else {
                    _button_draw(prevHoveredButton, window, prevHoveredButton->normalImage, 1, NULL, 1);
                }

                window->hoveredButton = NULL;

                _last_button_winID = window->id;

                if (!(prevHoveredButton->flags & BUTTON_FLAG_DISABLED)) {
                    if (prevHoveredButton->mouseExitProc != NULL) {
                        prevHoveredButton->mouseExitProc(prevHoveredButton->id, *keyCodePtr);
                        if (!(prevHoveredButton->flags & BUTTON_FLAG_0x40)) {
                            *keyCodePtr = -1;
                        }
                    }
                }
                return 0;
            }
            button = prevHoveredButton;
        } else if (prevClickedButton != NULL) {
            if (_button_under_mouse(prevClickedButton, &v58)) {
                if (!(prevClickedButton->flags & BUTTON_FLAG_DISABLED)) {
                    *keyCodePtr = prevClickedButton->mouseEnterEventCode;
                }

                if ((prevClickedButton->flags & BUTTON_FLAG_0x01) && (prevClickedButton->flags & BUTTON_FLAG_0x020000)) {
                    _button_draw(prevClickedButton, window, prevClickedButton->pressedImage, 1, NULL, 1);
                } else {
                    _button_draw(prevClickedButton, window, prevClickedButton->normalImage, 1, NULL, 1);
                }

                window->hoveredButton = prevClickedButton;

                _last_button_winID = window->id;

                if (!(prevClickedButton->flags & BUTTON_FLAG_DISABLED)) {
                    if (prevClickedButton->mouseEnterProc != NULL) {
                        prevClickedButton->mouseEnterProc(prevClickedButton->id, *keyCodePtr);
                        if (!(prevClickedButton->flags & BUTTON_FLAG_0x40)) {
                            *keyCodePtr = -1;
                        }
                    }
                }
                return 0;
            }
        }

        int v25 = _last_button_winID;
        if (_last_button_winID != -1 && _last_button_winID != window->id) {
            Window* v26 = windowGetWindow(_last_button_winID);
            if (v26 != NULL) {
                _last_button_winID = -1;

                Button* v28 = v26->hoveredButton;
                if (v28 != NULL) {
                    if (!(v28->flags & BUTTON_FLAG_DISABLED)) {
                        *keyCodePtr = v28->mouseExitEventCode;
                    }

                    if ((v28->flags & BUTTON_FLAG_0x01) && (v28->flags & BUTTON_FLAG_0x020000)) {
                        _button_draw(v28, v26, v28->pressedImage, 1, NULL, 1);
                    } else {
                        _button_draw(v28, v26, v28->normalImage, 1, NULL, 1);
                    }

                    v26->clickedButton = NULL;
                    v26->hoveredButton = NULL;

                    if (!(v28->flags & BUTTON_FLAG_DISABLED)) {
                        if (v28->mouseExitProc != NULL) {
                            v28->mouseExitProc(v28->id, *keyCodePtr);
                            if (!(v28->flags & BUTTON_FLAG_0x40)) {
                                *keyCodePtr = -1;
                            }
                        }
                    }
                    return 0;
                }
            }
        }

        ButtonCallback* cb = NULL;

        while (button != NULL) {
            if (!(button->flags & BUTTON_FLAG_DISABLED)) {
                rectCopy(&v58, &(button->rect));
                rectOffset(&v58, window->rect.left, window->rect.top);
                if (_button_under_mouse(button, &v58)) {
                    if (!(button->flags & BUTTON_FLAG_DISABLED)) {
                        if ((mouseEvent & MOUSE_EVENT_ANY_BUTTON_DOWN) != 0) {
                            if ((mouseEvent & MOUSE_EVENT_RIGHT_BUTTON_DOWN) != 0 && (button->flags & BUTTON_FLAG_RIGHT_MOUSE_BUTTON_CONFIGURED) == 0) {
                                button = NULL;
                                break;
                            }

                            if (button != window->hoveredButton && button != window->clickedButton) {
                                break;
                            }

                            window->clickedButton = button;
                            window->hoveredButton = button;

                            if ((button->flags & BUTTON_FLAG_0x01) != 0) {
                                if ((button->flags & BUTTON_FLAG_0x02) != 0) {
                                    if ((button->flags & BUTTON_FLAG_0x020000) != 0) {
                                        if (!(button->flags & BUTTON_FLAG_0x04)) {
                                            if (button->radioGroup != NULL) {
                                                button->radioGroup->field_4--;
                                            }

                                            if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_DOWN) != 0) {
                                                *keyCodePtr = button->leftMouseUpEventCode;
                                                cb = button->leftMouseUpProc;
                                            } else {
                                                *keyCodePtr = button->rightMouseUpEventCode;
                                                cb = button->rightMouseUpProc;
                                            }

                                            button->flags &= ~BUTTON_FLAG_0x020000;
                                        }
                                    } else {
                                        if (_button_check_group(button) == -1) {
                                            button = NULL;
                                            break;
                                        }

                                        if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_DOWN) != 0) {
                                            *keyCodePtr = button->lefMouseDownEventCode;
                                            cb = button->leftMouseDownProc;
                                        } else {
                                            *keyCodePtr = button->rightMouseDownEventCode;
                                            cb = button->rightMouseDownProc;
                                        }

                                        button->flags |= BUTTON_FLAG_0x020000;
                                    }
                                }
                            } else {
                                if (_button_check_group(button) == -1) {
                                    button = NULL;
                                    break;
                                }

                                if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_DOWN) != 0) {
                                    *keyCodePtr = button->lefMouseDownEventCode;
                                    cb = button->leftMouseDownProc;
                                } else {
                                    *keyCodePtr = button->rightMouseDownEventCode;
                                    cb = button->rightMouseDownProc;
                                }
                            }

                            _button_draw(button, window, button->pressedImage, 1, NULL, 1);
                            break;
                        }

                        Button* v49 = window->clickedButton;
                        if (button == v49 && (mouseEvent & MOUSE_EVENT_ANY_BUTTON_UP) != 0) {
                            window->clickedButton = NULL;
                            window->hoveredButton = v49;

                            if (v49->flags & BUTTON_FLAG_0x01) {
                                if (!(v49->flags & BUTTON_FLAG_0x02)) {
                                    if (v49->flags & BUTTON_FLAG_0x020000) {
                                        if (!(v49->flags & BUTTON_FLAG_0x04)) {
                                            if (v49->radioGroup != NULL) {
                                                v49->radioGroup->field_4--;
                                            }

                                            if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_UP) != 0) {
                                                *keyCodePtr = button->leftMouseUpEventCode;
                                                cb = button->leftMouseUpProc;
                                            } else {
                                                *keyCodePtr = button->rightMouseUpEventCode;
                                                cb = button->rightMouseUpProc;
                                            }

                                            button->flags &= ~BUTTON_FLAG_0x020000;
                                        }
                                    } else {
                                        if (_button_check_group(v49) == -1) {
                                            button = NULL;
                                            _button_draw(v49, window, v49->normalImage, 1, NULL, 1);
                                            break;
                                        }

                                        if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_UP) != 0) {
                                            *keyCodePtr = v49->lefMouseDownEventCode;
                                            cb = v49->leftMouseDownProc;
                                        } else {
                                            *keyCodePtr = v49->rightMouseDownEventCode;
                                            cb = v49->rightMouseDownProc;
                                        }

                                        v49->flags |= BUTTON_FLAG_0x020000;
                                    }
                                }
                            } else {
                                if (v49->flags & BUTTON_FLAG_0x020000) {
                                    if (v49->radioGroup != NULL) {
                                        v49->radioGroup->field_4--;
                                    }
                                }

                                if ((mouseEvent & MOUSE_EVENT_LEFT_BUTTON_UP) != 0) {
                                    *keyCodePtr = v49->leftMouseUpEventCode;
                                    cb = v49->leftMouseUpProc;
                                } else {
                                    *keyCodePtr = v49->rightMouseUpEventCode;
                                    cb = v49->rightMouseUpProc;
                                }
                            }

                            if (button->hoverImage != NULL) {
                                _button_draw(button, window, button->hoverImage, 1, NULL, 1);
                            } else {
                                _button_draw(button, window, button->normalImage, 1, NULL, 1);
                            }
                            break;
                        }
                    }

                    if (window->hoveredButton == NULL && mouseEvent == 0) {
                        window->hoveredButton = button;
                        if (!(button->flags & BUTTON_FLAG_DISABLED)) {
                            *keyCodePtr = button->mouseEnterEventCode;
                            cb = button->mouseEnterProc;
                        }

                        _button_draw(button, window, button->hoverImage, 1, NULL, 1);
                    }
                    break;
                }
            }
            button = button->next;
        }

        if (button != NULL) {
            if ((button->flags & BUTTON_FLAG_0x10) != 0
                && (mouseEvent & MOUSE_EVENT_ANY_BUTTON_DOWN) != 0
                && (mouseEvent & MOUSE_EVENT_ANY_BUTTON_REPEAT) == 0) {
                _win_drag(window->id);
                _button_draw(button, window, button->normalImage, 1, NULL, 1);
            }
        } else if ((window->flags & WINDOW_FLAG_0x80) != 0) {
            v25 |= mouseEvent << 8;
            if ((mouseEvent & MOUSE_EVENT_ANY_BUTTON_DOWN) != 0
                && (mouseEvent & MOUSE_EVENT_ANY_BUTTON_REPEAT) == 0) {
                _win_drag(window->id);
            }
        }

        _last_button_winID = window->id;

        if (button != NULL) {
            if (cb != NULL) {
                cb(button->id, *keyCodePtr);
                if (!(button->flags & BUTTON_FLAG_0x40)) {
                    *keyCodePtr = -1;
                }
            }
        }

        return 0;
    }

    if (prevHoveredButton != NULL) {
        *keyCodePtr = prevHoveredButton->mouseExitEventCode;

        unsigned char* data;
        if ((prevHoveredButton->flags & BUTTON_FLAG_0x01) && (prevHoveredButton->flags & BUTTON_FLAG_0x020000)) {
            data = prevHoveredButton->pressedImage;
        } else {
            data = prevHoveredButton->normalImage;
        }

        _button_draw(prevHoveredButton, window, data, 1, NULL, 1);

        window->hoveredButton = NULL;
    }

    if (*keyCodePtr != -1) {
        _last_button_winID = window->id;

        if ((prevHoveredButton->flags & BUTTON_FLAG_DISABLED) == 0) {
            if (prevHoveredButton->mouseExitProc != NULL) {
                prevHoveredButton->mouseExitProc(prevHoveredButton->id, *keyCodePtr);
                if (!(prevHoveredButton->flags & BUTTON_FLAG_0x40)) {
                    *keyCodePtr = -1;
                }
            }
        }
        return 0;
    }

    if (prevHoveredButton != NULL) {
        if ((prevHoveredButton->flags & BUTTON_FLAG_DISABLED) == 0) {
            if (prevHoveredButton->mouseExitProc != NULL) {
                prevHoveredButton->mouseExitProc(prevHoveredButton->id, *keyCodePtr);
            }
        }
    }

    return -1;
}

// 0x4D9214
bool _button_under_mouse(Button* button, Rect* rect)
{
    if (!_mouse_click_in(rect->left, rect->top, rect->right, rect->bottom)) {
        return false;
    }

    if (button->mask == NULL) {
        return true;
    }

    int x;
    int y;
    mouseGetPosition(&x, &y);
    x -= rect->left;
    y -= rect->top;

    int width = button->rect.right - button->rect.left + 1;
    return button->mask[width * y + x] != 0;
}

// 0x4D927C
int buttonGetWindowId(int btn)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Window* window;
    if (buttonGetButton(btn, &window) == NULL) {
        return -1;
    }

    return window->id;
}

// 0x4D92B4
int _win_last_button_winID()
{
    return _last_button_winID;
}

// 0x4D92BC
int buttonDestroy(int btn)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Window* window;
    Button* button = buttonGetButton(btn, &window);
    if (button == NULL) {
        return -1;
    }

    if (button->prev != NULL) {
        button->prev->next = button->next;
    } else {
        window->buttonListHead = button->next;
    }

    if (button->next != NULL) {
        button->next->prev = button->prev;
    }

    windowFill(window->id, button->rect.left, button->rect.top, button->rect.right - button->rect.left + 1, button->rect.bottom - button->rect.top + 1, window->color);

    if (button == window->hoveredButton) {
        window->hoveredButton = NULL;
    }

    if (button == window->clickedButton) {
        window->clickedButton = NULL;
    }

    buttonFree(button);

    return 0;
}

// 0x4D9374
void buttonFree(Button* button)
{
    if ((button->flags & BUTTON_FLAG_0x010000) == 0) {
        if (button->normalImage != NULL) {
            internal_free(button->normalImage);
        }

        if (button->pressedImage != NULL) {
            internal_free(button->pressedImage);
        }

        if (button->hoverImage != NULL) {
            internal_free(button->hoverImage);
        }

        if (button->disabledNormalImage != NULL) {
            internal_free(button->disabledNormalImage);
        }

        if (button->disabledPressedImage != NULL) {
            internal_free(button->disabledPressedImage);
        }

        if (button->disabledHoverImage != NULL) {
            internal_free(button->disabledHoverImage);
        }
    }

    RadioGroup* radioGroup = button->radioGroup;
    if (radioGroup != NULL) {
        for (int index = 0; index < radioGroup->buttonsLength; index++) {
            if (button == radioGroup->buttons[index]) {
                for (; index < radioGroup->buttonsLength - 1; index++) {
                    radioGroup->buttons[index] = radioGroup->buttons[index + 1];
                }

                radioGroup->buttonsLength--;

                break;
            }
        }
    }

    internal_free(button);
}

// NOTE: Inlined.
//
// 0x4D9458
static int button_new_id()
{
    int btn;

    btn = 1;
    while (buttonGetButton(btn, NULL) != NULL) {
        btn++;
    }

    return btn;
}

// 0x4D9474
int buttonEnable(int btn)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Window* window;
    Button* button = buttonGetButton(btn, &window);
    if (button == NULL) {
        return -1;
    }

    if ((button->flags & BUTTON_FLAG_DISABLED) != 0) {
        button->flags &= ~BUTTON_FLAG_DISABLED;
        _button_draw(button, window, button->currentImage, 1, NULL, 0);
    }

    return 0;
}

// 0x4D94D0
int buttonDisable(int btn)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Window* window;
    Button* button = buttonGetButton(btn, &window);
    if (button == NULL) {
        return -1;
    }

    if ((button->flags & BUTTON_FLAG_DISABLED) == 0) {
        button->flags |= BUTTON_FLAG_DISABLED;

        _button_draw(button, window, button->currentImage, 1, NULL, 0);

        if (button == window->hoveredButton) {
            if (window->hoveredButton->mouseExitEventCode != -1) {
                enqueueInputEvent(window->hoveredButton->mouseExitEventCode);
                window->hoveredButton = NULL;
            }
        }
    }

    return 0;
}

// 0x4D9554
int _win_set_button_rest_state(int btn, bool a2, int a3)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Window* window;
    Button* button = buttonGetButton(btn, &window);
    if (button == NULL) {
        return -1;
    }

    if ((button->flags & BUTTON_FLAG_0x01) != 0) {
        int keyCode = -1;

        if ((button->flags & BUTTON_FLAG_0x020000) != 0) {
            if (!a2) {
                button->flags &= ~BUTTON_FLAG_0x020000;

                if ((a3 & 0x02) == 0) {
                    _button_draw(button, window, button->normalImage, 1, NULL, 0);
                }

                if (button->radioGroup != NULL) {
                    button->radioGroup->field_4--;
                }

                keyCode = button->leftMouseUpEventCode;
            }
        } else {
            if (a2) {
                button->flags |= BUTTON_FLAG_0x020000;

                if ((a3 & 0x02) == 0) {
                    _button_draw(button, window, button->pressedImage, 1, NULL, 0);
                }

                if (button->radioGroup != NULL) {
                    button->radioGroup->field_4++;
                }

                keyCode = button->lefMouseDownEventCode;
            }
        }

        if (keyCode != -1) {
            if ((a3 & 0x01) != 0) {
                enqueueInputEvent(keyCode);
            }
        }
    }

    return 0;
}

// 0x4D962C
int _win_group_check_buttons(int buttonCount, int* btns, int a3, void (*a4)(int))
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (buttonCount >= RADIO_GROUP_BUTTON_LIST_CAPACITY) {
        return -1;
    }

    for (int groupIndex = 0; groupIndex < RADIO_GROUP_LIST_CAPACITY; groupIndex++) {
        RadioGroup* radioGroup = &(gRadioGroups[groupIndex]);
        if (radioGroup->buttonsLength == 0) {
            radioGroup->field_4 = 0;

            for (int buttonIndex = 0; buttonIndex < buttonCount; buttonIndex++) {
                Button* button = buttonGetButton(btns[buttonIndex], NULL);
                if (button == NULL) {
                    return -1;
                }

                radioGroup->buttons[buttonIndex] = button;

                button->radioGroup = radioGroup;

                if ((button->flags & BUTTON_FLAG_0x020000) != 0) {
                    radioGroup->field_4++;
                }
            }

            radioGroup->buttonsLength = buttonCount;
            radioGroup->field_0 = a3;
            radioGroup->field_8 = a4;
            return 0;
        }
    }

    return -1;
}

// 0x4D96EC
int _win_group_radio_buttons(int count, int* btns)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    if (_win_group_check_buttons(count, btns, 1, NULL) == -1) {
        return -1;
    }

    Button* button = buttonGetButton(btns[0], NULL);
    RadioGroup* radioGroup = button->radioGroup;

    for (int index = 0; index < radioGroup->buttonsLength; index++) {
        Button* v1 = radioGroup->buttons[index];
        v1->flags |= BUTTON_FLAG_0x040000;
    }

    return 0;
}

// 0x4D9744
int _button_check_group(Button* button)
{
    if (button->radioGroup == NULL) {
        return 0;
    }

    if ((button->flags & BUTTON_FLAG_0x040000) != 0) {
        if (button->radioGroup->field_4 > 0) {
            for (int index = 0; index < button->radioGroup->buttonsLength; index++) {
                Button* v1 = button->radioGroup->buttons[index];
                if ((v1->flags & BUTTON_FLAG_0x020000) != 0) {
                    v1->flags &= ~BUTTON_FLAG_0x020000;

                    Window* window;
                    buttonGetButton(v1->id, &window);
                    _button_draw(v1, window, v1->normalImage, 1, NULL, 1);

                    if (v1->leftMouseUpProc != NULL) {
                        v1->leftMouseUpProc(v1->id, v1->leftMouseUpEventCode);
                    }
                }
            }
        }

        if ((button->flags & BUTTON_FLAG_0x020000) == 0) {
            button->radioGroup->field_4++;
        }

        return 0;
    }

    if (button->radioGroup->field_4 < button->radioGroup->field_0) {
        if ((button->flags & BUTTON_FLAG_0x020000) == 0) {
            button->radioGroup->field_4++;
        }

        return 0;
    }

    if (button->radioGroup->field_8 != NULL) {
        button->radioGroup->field_8(button->id);
    }

    return -1;
}

// 0x4D9808
void _button_draw(Button* button, Window* window, unsigned char* data, int a4, Rect* a5, int a6)
{
    unsigned char* previousImage = NULL;
    if (data != NULL) {
        Rect v2;
        rectCopy(&v2, &(button->rect));
        rectOffset(&v2, window->rect.left, window->rect.top);

        Rect v3;
        if (a5 != NULL) {
            if (rectIntersection(&v2, a5, &v2) == -1) {
                return;
            }

            rectCopy(&v3, &v2);
            rectOffset(&v3, -window->rect.left, -window->rect.top);
        } else {
            rectCopy(&v3, &(button->rect));
        }

        if (data == button->normalImage && (button->flags & BUTTON_FLAG_0x020000)) {
            data = button->pressedImage;
        }

        if (button->flags & BUTTON_FLAG_DISABLED) {
            if (data == button->normalImage) {
                data = button->disabledNormalImage;
            } else if (data == button->pressedImage) {
                data = button->disabledPressedImage;
            } else if (data == button->hoverImage) {
                data = button->disabledHoverImage;
            }
        } else {
            if (data == button->disabledNormalImage) {
                data = button->normalImage;
            } else if (data == button->disabledPressedImage) {
                data = button->pressedImage;
            } else if (data == button->disabledHoverImage) {
                data = button->hoverImage;
            }
        }

        if (data) {
            if (a4 == 0) {
                int width = button->rect.right - button->rect.left + 1;
                if ((button->flags & BUTTON_FLAG_TRANSPARENT) != 0) {
                    blitBufferToBufferTrans(
                        data + (v3.top - button->rect.top) * width + v3.left - button->rect.left,
                        v3.right - v3.left + 1,
                        v3.bottom - v3.top + 1,
                        width,
                        window->buffer + window->width * v3.top + v3.left,
                        window->width);
                } else {
                    blitBufferToBuffer(
                        data + (v3.top - button->rect.top) * width + v3.left - button->rect.left,
                        v3.right - v3.left + 1,
                        v3.bottom - v3.top + 1,
                        width,
                        window->buffer + window->width * v3.top + v3.left,
                        window->width);
                }
            }

            previousImage = button->currentImage;
            button->currentImage = data;

            if (a4 != 0) {
                _GNW_win_refresh(window, &v2, 0);
            }
        }
    }

    if (a6) {
        if (previousImage != data) {
            if (data == button->pressedImage && button->onPressed != NULL) {
                button->onPressed(button->id, button->lefMouseDownEventCode);
            } else if (data == button->normalImage && button->onUnpressed != NULL) {
                button->onUnpressed(button->id, button->leftMouseUpEventCode);
            }
        }
    }
}

// 0x4D9A58
void _GNW_button_refresh(Window* window, Rect* rect)
{
    Button* button = window->buttonListHead;
    if (button != NULL) {
        while (button->next != NULL) {
            button = button->next;
        }
    }

    while (button != NULL) {
        _button_draw(button, window, button->currentImage, 0, rect, 0);
        button = button->prev;
    }
}

// 0x4D9AA0
int _win_button_press_and_release(int btn)
{
    if (!gWindowSystemInitialized) {
        return -1;
    }

    Window* window;
    Button* button = buttonGetButton(btn, &window);
    if (button == NULL) {
        return -1;
    }

    _button_draw(button, window, button->pressedImage, 1, NULL, 1);

    if (button->leftMouseDownProc != NULL) {
        button->leftMouseDownProc(btn, button->lefMouseDownEventCode);

        if ((button->flags & BUTTON_FLAG_0x40) != 0) {
            enqueueInputEvent(button->lefMouseDownEventCode);
        }
    } else {
        if (button->lefMouseDownEventCode != -1) {
            enqueueInputEvent(button->lefMouseDownEventCode);
        }
    }

    _button_draw(button, window, button->normalImage, 1, NULL, 1);

    if (button->leftMouseUpProc != NULL) {
        button->leftMouseUpProc(btn, button->leftMouseUpEventCode);

        if ((button->flags & BUTTON_FLAG_0x40) != 0) {
            enqueueInputEvent(button->leftMouseUpEventCode);
        }
    } else {
        if (button->leftMouseUpEventCode != -1) {
            enqueueInputEvent(button->leftMouseUpEventCode);
        }
    }

    return 0;
}

} // namespace fallout