#! /usr/bin/env bash

pkg="$(echo "$1" | sed 's@/*$@@;s@^\.*/*@@')"

if [ -z "${pkg}" ]; then
	echo "Usage: build <package>" 2>&1

	exit 1
fi

function determineOsArch() {
	os="$(uname -s | dd conv=lcase 2>/dev/null)"
	arch="$(uname -m | dd conv=lcase 2>/dev/null)"

	case "${arch}" in
		i?86)
			arch='ix86'
			;;
	esac
}

function determinePrefix() {
	determineOsArch

	prefixsuffix="${pkg}/${os}-${arch}/${version}"
	prefix="/opt/appfs/${domain}/${prefixsuffix}"
	destdir="$(pwd)/INST"

	mkdir "${destdir}" || die
}

function preconfigure() {
	:
}

function postconfigure() {
	:
}

function configure() {
	glibcvers=2.20
	glibcdir="/opt/appfs/core.appfs.rkeene.org/glibc/platform/${glibcvers}"
	dynlinker="$(ls "${glibcdir}"/lib/ld-linux*.so.* | tail -n 1)"

	CFLAGS="-I${glibcdir}/include"
	CPPFLAGS="-I${glibcdir}/include"
	LDFLAGS="-Wl,--rpath,${glibcdir}/lib -Wl,--dynamic-linker,${dynlinker}"
	export CFLAGS CPPFLAGS LDFLAGS

	./configure --prefix="${prefix}" --sysconfdir=/etc --localstatedir=/var
}

function prebuild() {
	:
}

function postbuild() {
	:
}

function build() {
	grep "DESTDIR" Makefile || die "Don't know how to build this software"

	make
}

function preinstall() {
	:
}

function postinstall() {
	:
}

function install() {
	make install DESTDIR="${destdir}"
}

function cleanup() {
	cd "${workdir}" || exit 1
	cd .. || exit 1
	rm -rf "${workdir}"
}

function die() {
	local message

	message="$1"

	if [ -n "${message}" ]; then
		echo "error: ${message}" >&2
	fi

	cleanup

	exit 1
}

cd "$(dirname "$(which "$0")")" || exit 1

if [ -f 'build.conf' ]; then
	. 'build.conf'
fi

if [ -d "pkgs/${pkg}" ]; then
	pkgdir="pkgs/${pkg}"
	pkgfile="${pkgdir}/info"
else
	pkgfile="pkgs/${pkg}"
	pkgdir="${pkgfile}"
fi
pkgdate="$(find "${pkgdir}" -type f -printf '%TY%Tm%Td%TH%TM.%TS\n' | cut -f 1-2 -d '.' | sort -n | tail -n 1)"

. "${pkgfile}"

archivedir="$(pwd)/ARCHIVE"
workdir="workdir-$$${RANDOM}${RANDOM}${RANDOM}"
mkdir "${workdir}" "${archivedir}"
cd "${workdir}" || exit 1
workdir="$(pwd)"

# Download
## Cleanup
rm -f src.new src

## Fetch file
wget -O src.new "${url}" || exit 1

## Verify signature
### XXX:TODO

## Move file into place
mv src.new src

# Decompress archive
## Determine type of archive
case "${url}" in
	*.tar.xz|*.tar.xz'?'*|*.txz)
		decompress='xz'
		;;
	*.tar.gz|*.tar.gz'?'*|*.tgz)
		decompress='gzip'
		;;
	*.tar.bz2|*.tar.bz2'?'*|*.tbz2)
		decompress='bzip2'
		;;
	*.zip|*.zip'?'*)
		decompress='unzip'
		;;
	*)
		echo "Unknown compression method: ${url}" >&2

		exit 1
		;;
esac

## Do decompression
case "${decompress}" in
	unzip)
		unzip 'src' || die 'Unable to uncompress archive'
		;;
	*)
		"${decompress}" -dc src | tar -xf - || die 'Unable to uncompress archive'
		;;
esac

## Cleanup source
rm -f src

# If we just have one directory, use that directory
dir="$(echo *)"
if [ -e "${dir}" ]; then
	mv "${dir}"/* .
fi

# Start logging
set -x

# Determine properties
determinePrefix

# Start the build
preconfigure || die 'preconfigure failed'
configure || die 'configure failed'
postconfigure || die 'postconfigure failed'

prebuild || die 'prebuild failed'
build || die 'build failed'
postbuild || die 'postbuild failed'

preinstall || die 'preinstall failed'
install || die 'install failed'
postinstall || die 'postinstall failed'

(
	appdir="$(appfsinstalldir)/${prefixsuffix}"
	mkdir -p "${appdir}"

	cd "${destdir}/${prefix}" || exit 1
	cp -rp * "${appdir}"
	find "${appdir}" -print0 | xargs -0 touch -t "${pkgdate}"
)

cleanup

exit 0
