#!/bin/sh

# builds a pak0.pak file for a respective gamedir

export PATH=$(pwd)/_bin:$PATH;

set -e

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

if [ $# -lt 1 ]
then
    usage
fi

PAK0_OUTDIR="$(pwd)/_build/halflife/$1-pak0"
FINAL_TEST=$(cat "sums/$1_pak0.sha512" | awk '{ print $1 }')

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

	if [ ! -z "$HL_STEAM_INSTALL" ]
	then
		find "$HL_STEAM_INSTALL" -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}" = "$2" ]
			then
				mkdir -p "${PAK0_OUTDIR}/$(dirname $1)"
				cp -v "${FOUND}" "${PAK0_OUTDIR}/$1"
				exit 0
			fi
		done

		if [ -f "${PAK0_OUTDIR}/$1" ]
		then
			return
		fi
	fi

	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}" = "$2" ]
		then
			mkdir -p "${PAK0_OUTDIR}/$(dirname $1)"
			cp -v "${FOUND}" "${PAK0_OUTDIR}/$1"
			exit 0
		fi
	done

	if [ ! -f "${PAK0_OUTDIR}/$1" ]
	then
		echo "${1}" >> "./_build/missing-$3-pak0.txt"
	fi
}

# clean up
if [ -d "$PAK0_OUTDIR" ]
then
		rm -rf "$PAK0_OUTDIR"
fi
mkdir -p "$PAK0_OUTDIR"

if [ -f "./_build/missing-$1-pak0.txt" ]
then
	rm "./_build/missing-$1-pak0.txt"
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-pak0.sha256"

# move the qfiles script over
mkdir -p "$PAK0_OUTDIR/src/"
cp -v "games/$1.dat" "$PAK0_OUTDIR/src/files.dat"

cd "$PAK0_OUTDIR/src/"
qfiles -pak 0

# GNU vs non GNU
if [ -x "$(command -v sha512sum)" ]
then
	FINAL_CHECK=$(sha512sum "$PAK0_OUTDIR/pak0.pak" | awk '{ print $1 }')
elif [ -x "$(command -v sha512)" ]
then
	FINAL_CHECK=$(sha512 -q "$PAK0_OUTDIR/pak0.pak")
else
	echo "No tool to validate sha512 sums with!"
	exit 2
fi

echo "Desired SHA512:   ${FINAL_TEST}"
echo "Generated SHA512: ${FINAL_CHECK}"

if [ "${FINAL_CHECK}" = "${FINAL_TEST}" ]
then
	echo "$1's pak0.pak has been built and verified!"
else
	echo "$1's pak0.pak FAILED the check. Will not pass purity test."
fi

cd "$PAK0_OUTDIR/../"
mkdir -p "./$1"
mv "$PAK0_OUTDIR/pak0.pak" "./$1/pak0.pak"
rm -rf "$PAK0_OUTDIR"