#!/bin/bash

# Config
DirectorY="$1"
OutDir="$2"
FileName="$3"
BuiltDLP="$4"
MD5Sum="$5"
BackupDLP="http://wz2100.net/~dak180/BuildTools/Mac/"


# Make sure we are in the right place
cd "${SRCROOT}"
if [ ! -d "external" ]; then
	mkdir external
fi
if [ ! -d "prebuilt" ]; then
	mkdir prebuilt
fi

# Checks
if [ "${ACTION}" = "clean" ]; then
	# Force cleaning when directed
	rm -fRv "prebuilt/${DirectorY}" "external/${OutDir}"
	MD5SumLoc="$(md5 -q "prebuilt/${FileName}")"
	if [ "${MD5SumLoc}" != "${MD5Sum}" ]; then
		rm -fRv "prebuilt/${FileName}"
	fi
	exit 0
elif [ -d "prebuilt/${DirectorY}" ]; then
	# Clean if dirty
	echo "error: ${DirectorY} exists, probably from an earlier failed run" >&2
# 	rm -frv "prebuilt/${DirectorY}"
	exit 1
elif [[ -d "external/${OutDir}" ]] && [[ ! -f "prebuilt/${FileName}" ]]; then
	# Clean up when updating versions
	echo "warning: Cached file is outdated or incomplete, removing" >&2
	rm -fR "prebuilt/${DirectorY}" "external/${OutDir}"
elif [[ -d "external/${OutDir}" ]] && [[ -f "prebuilt/${FileName}" ]]; then
	# Check to make sure we have the right file
	MD5SumLoc="$(cat "external/${OutDir}/.MD5SumLoc" 2>/dev/null || echo "")"
	if [ "${MD5SumLoc}" != "${MD5Sum}" ]; then
		echo "warning: Cached file is outdated or incorrect, removing" >&2
		rm -fR "prebuilt/${DirectorY}" "external/${OutDir}"
		MD5SumFle=`md5 -q "prebuilt/${FileName}"`
		if [ "${MD5SumFle}" != "${MD5Sum}" ]; then
			rm -fR "prebuilt/${FileName}"
		fi
	else
		# Do not do more work then we have to
		echo "${OutDir} already exists, skipping" >&2
		exit 0
	fi
fi

# Fetch
cd prebuilt
if [ ! -f "${FileName}" ]; then
	echo "Fetching ${FileName}"
	if ! curl -LfO --connect-timeout "30" "${BuiltDLP}"; then
		if ! curl -LfOC - --connect-timeout "30" "${BackupDLP}${FileName}"; then
			echo "error: Unable to fetch ${SourceDLP}" >&2
			exit 1
		fi
	fi
else
	echo "${FileName} already exists, skipping" >&2
fi

# MD5 check
MD5SumLoc="$(md5 -q "${FileName}")"
if [ -z "${MD5SumLoc}" ]; then
	echo "error: Unable to compute md5 for ${FileName}" >&2
	exit 1
elif [ "${MD5SumLoc}" != "${MD5Sum}" ]; then
	echo "error: MD5 does not match for ${FileName}" >&2
	exit 1
fi

# Unpack
if ! tar -xzf "${FileName}"; then
	echo "error: Unpacking $FileName failed" >&2
	exit 1
fi

# Save the sum
echo "${MD5SumLoc}" > "${DirectorY}/.MD5SumLoc"

# Move
if [ ! -d "${DirectorY}" ]; then
	echo "error: Can't find $DirectorY to rename" >&2
	exit 1
else
	cd ..
	mv "prebuilt/${DirectorY}" "external/${OutDir}"
	touch external/${OutDir}/*
fi

exit 0
