#!/bin/sh

# builds a pak0.pak file for a respective gamedir

set -e

usage ()
{
    echo Usage: `basename $0` gamedir >&2
    exit 2
}

if [ $# -lt 1 ]
then
    usage
fi

FILES_OUTDIR="$(pwd)/_build/halflife/$1"
FILES_MISSING="$(pwd)/_build/missing-$1-loose.txt"

find_file ()
{
	SEARCHNAME=$(basename "${1}")

	#echo "Looking for $SEARCHNAME"

	find "./_tmp" -type f -name "${SEARCHNAME}" | while read FOUND
	do
		# GNU vs non GNU
		if [ -x "$(command -v sha512sum)" ]
		then
			CHECK=$(sha256sum "$FOUND" | awk '{ print $1 }')
		elif [ -x "$(command -v sha512)" ]
		then
			CHECK=$(sha256 -q "$FOUND")
		else
			echo "No tool to validate sha256 sums with!"
			exit 2
		fi
		
		if [ "${CHECK}" = "$2" ]
		then
			mkdir -p "${FILES_OUTDIR}/$(dirname $1)"
			cp -v "${FOUND}" "${FILES_OUTDIR}/$1"
			exit 0
		fi
	done

	if [ ! -f "${FILES_OUTDIR}/$1" ]
	then
		echo "${1}" >> "$FILES_MISSING"
	fi
}

find_file_whatever ()
{
	echo "Looking for $1"

	find "./_tmp" -type f -path "*/${2}/${1}*" | while read FOUND
	do
		mkdir -p "${FILES_OUTDIR}/$(dirname $1)"
		cp -v "${FOUND}" "${FILES_OUTDIR}/$1"
		exit 0
	done
}

if [ ! -d "$FILES_OUTDIR" ]
then
	echo "Please generate a pak0.pak first."
	exit 2
fi

if [ -f "$FILES_MISSING" ]
then
	rm -v "$FILES_MISSING"
fi

while read LINE
do
	FILE=$(echo ${LINE} | cut -d ' ' -f 2)
	SUM=$(echo ${LINE} | cut -d ' ' -f 1)
	find_file ${FILE} $SUM $1
done < "games/$1.sha256"

# since we don't need to pass purity checks for these
# we'll find the next best equivalent
while read LINE
do
	FILE=$(echo ${LINE} | cut -d ' ' -f 2)
	find_file_whatever ${FILE} $1
done < "$FILES_MISSING"