#!/bin/bash

# Some PKGBUILDs need CARCH to be set
CARCH="x86_64"

# Useful functions
UMASK=""
set_umask () {
	[ "$UMASK" == "" ] && UMASK="$(umask)"
	export UMASK
	umask 002
}

restore_umask () {
	umask $UMASK >/dev/null
}

# set up general environment
WORKDIR=$(mktemp -d /tmp/$(basename $0).XXXXXXXXXX)
LOCKS=()

# check if messages are to be printed using color
unset ALL_OFF BOLD BLUE GREEN RED YELLOW
if [[ -t 2 ]]; then
	ALL_OFF="$(tput sgr0)"
	BOLD="$(tput bold)"
	BLUE="${BOLD}$(tput setaf 4)"
	GREEN="${BOLD}$(tput setaf 2)"
	RED="${BOLD}$(tput setaf 1)"
	YELLOW="${BOLD}$(tput setaf 3)"
fi
readonly ALL_OFF BOLD BLUE GREEN RED YELLOW

plain() {
	local mesg=$1; shift
	printf "${BOLD}    ${mesg}${ALL_OFF}\n" "$@"
}

msg() {
	local mesg=$1; shift
	printf "${GREEN}==>${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@"
}

msg2() {
	local mesg=$1; shift
	printf "${BLUE}  ->${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@"
}

warning() {
	local mesg=$1; shift
	printf "${YELLOW}==> WARNING:${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
}

error() {
	local mesg=$1; shift
	printf "${RED}==> ERROR${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
}

##
#  usage : in_array( $needle, $haystack )
# return : 0 - found
#          1 - not found
##
in_array() {
	local needle=$1; shift
	[[ -z $1 ]] && return 1 # Not Found
	local item
	for item in "$@"; do
		[[ $item = $needle ]] && return 0 # Found
	done
	return 1 # Not Found
}

script_lock() {
	local LOCKDIR="$TMPDIR/.scriptlock.$(basename $0)"
	if ! mkdir "$LOCKDIR" >/dev/null 2>&1 ; then
		local _owner="$(/usr/bin/stat -c %U $LOCKDIR)"
		error "Script $(basename $0) is already locked by $_owner."
		exit 1
	else
		set_umask
		return 0
	fi
}

script_unlock() {
	local LOCKDIR="$TMPDIR/.scriptlock.$(basename $0)"
	if [ ! -d "$LOCKDIR" ]; then
		warning "Script $(basename $0) was not locked!"
		restore_umask
		return 1
	else
		rmdir "$LOCKDIR"
		restore_umask
		return 0
	fi
}

cleanup() {
	local l
	local repo
	local arch

	trap - EXIT INT QUIT TERM
	for l in ${LOCKS[@]}; do
		repo=${l%.*}
		arch=${l#*.}
		if [ -d "$TMPDIR/.repolock.$repo.$arch" ]; then
			msg "Removing left over lock from [${repo}] (${arch})"
			repo_unlock $repo $arch
		fi
	done
	if [ -d "$TMPDIR/.scriptlock.$(basename $0)" ]; then
		msg "Removing left over lock from $(basename $0)"
		script_unlock
	fi
	rm -rf "$WORKDIR"
	[ "$1" ] && exit $1
}

abort() {
	msg 'Aborting...'
	cleanup 0
}

die() {
	error "$*"
	cleanup 1
}

trap abort INT QUIT TERM HUP
trap cleanup EXIT


#repo_lock <repo-name> <arch> [timeout]
repo_lock () {
	local LOCKDIR="$TMPDIR/.repolock.$1.$2"
	local _count
	local _trial
	local _timeout
	local _lockblock
	local _owner

	if [ $# -eq 2 ]; then
		_lockblock=true
		_trial=0
	elif [ $# -eq 3 ]; then
		_lockblock=false
		_timeout=$3
		let _trial=$_timeout/$LOCK_DELAY
	fi

	_count=0
	while [ $_count -le $_trial ] || $_lockblock ; do
		if ! mkdir "$LOCKDIR" >/dev/null 2>&1 ; then
			_owner="$(/usr/bin/stat -c %U $LOCKDIR)"
			warning "Repo [${1}] (${2}) is already locked by $_owner. "
			msg2 "Retrying in $LOCK_DELAY seconds..."
		else
			LOCKS[${#LOCKS[*]}]="$1.$2"
			set_umask
			return 0
		fi
		sleep $LOCK_DELAY
		let _count=$_count+1
	done

	error "Repo [${1}] (${2}) is already locked by $_owner. Giving up!"
	return 1
}

repo_unlock () { #repo_unlock <repo-name> <arch>
	local LOCKDIR="$TMPDIR/.repolock.$1.$2"
	if [ ! -d "$LOCKDIR" ]; then
		warning "Repo lock [${1}] (${2}) was not locked!"
		restore_umask
		return 1
	else
		rmdir "$LOCKDIR"
		restore_umask
		return 0
	fi
}

# usage: _grep_pkginfo pkgfile pattern
_grep_pkginfo() {
	local _ret

	_ret="$(/usr/bin/bsdtar -xOqf "$1" .PKGINFO | /bin/grep -m 1 "^${2} = ")"
	echo "${_ret#${2} = }"
}


# Get the package base or name as fallback
getpkgbase() {
	local _base

	_base="$(_grep_pkginfo "$1" "pkgbase")"
	if [ -z "$_base" ]; then
		getpkgname "$1"
	else
		echo "$_base"
	fi
}

issplitpkg() {
	local _base

	_base="$(_grep_pkginfo "$1" "pkgbase")"
	if [ -z "$_base" ]; then
		return 1
	else
		return 0
	fi
}

# Get the package name
getpkgname() {
	local _name

	_name="$(_grep_pkginfo "$1" "pkgname")"
	if [ -z "$_name" ]; then
		error "Package '$1' has no pkgname in the PKGINFO. Fail!"
		exit 1
	fi

	echo "$_name"
}

# Get the pkgver-pkgrel of this package
getpkgver() {
	local _ver

	_ver="$(_grep_pkginfo "$1" "pkgver")"
	if [ -z "$_ver" ]; then
		error "Package '$1' has no pkgver in the PKGINFO. Fail!"
		exit 1
	fi

	echo "$_ver"
}

getpkgarch() {
	local _ver

	_ver="$(_grep_pkginfo "$1" "arch")"
	if [ -z "$_ver" ]; then
		error "Package '$1' has no arch in the PKGINFO. Fail!"
		exit 1
	fi

	echo "$_ver"
}

getpkgfile() {
	if [[ ${#} -ne 1 ]]; then
		error 'No canonical package found!'
		exit 1
	elif [ ! -f "${1}" ]; then
		error "Package ${1} not found!"
		exit 1
	fi

	echo ${1}
}

getpkgfiles() {
	local f
	if [ ! -z "$(echo ${@%\.*} | sed "s/ /\n/g" | sort | uniq -D)" ]; then
		error 'Duplicate packages found!'
		exit 1
	fi

	for f in ${@}; do
		if  [ ! -f "${f}" ]; then
			error "Package ${f} not found!"
			exit 1
		fi
	done

	echo ${@}
}

check_pkgfile() {
	local pkgfile=$1

	local pkgname="$(getpkgname ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgver="$(getpkgver ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgarch="$(getpkgarch ${pkgfile})"
	[ $? -ge 1 ] && return 1

	in_array "${pkgarch}" ${ARCHES[@]} 'any' || return 1

	if echo "$(basename ${pkgfile})" | grep -q "${pkgname}-${pkgver}-${pkgarch}"; then
		return 0
	else
		return 1
	fi
}

check_pkgsvn() {
	local pkgfile="${1}"
	local _pkgbase="$(getpkgbase ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local _pkgname="$(getpkgname ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local _pkgver="$(getpkgver ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local _pkgarch="$(getpkgarch ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local repo="${2}"

	in_array "${repo}" ${PKGREPOS[@]} || return 1

	if [ ! -f "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}" ]; then
		mkdir -p "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}"
		svn export -q "${SVNREPO}/${_pkgbase}/repos/${repo}-${_pkgarch}/PKGBUILD" \
			"${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}" >/dev/null
		[ $? -ge 1 ] && return 1
	fi

	local svnver="$(. "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}"; echo "${pkgver}-${pkgrel}")"
	[ "${svnver}" == "${_pkgver}" ] || return 1

	local svnnames=($(. "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}"; echo ${pkgname[@]}))
	in_array "${_pkgname}" ${svnnames[@]} || return 1

	return 0
}

check_splitpkgs() {
	local repo="${1}"
	shift
	local pkgfiles=(${@})
	local pkgfile
	local pkgdir
	local svnname

	mkdir -p "${WORKDIR}/check_splitpkgs/"
	pushd "${WORKDIR}/check_splitpkgs" >/dev/null

	for pkgfile in ${pkgfiles[@]}; do
		issplitpkg "${pkgfile}" || continue
		local _pkgbase="$(getpkgbase ${pkgfile})"
		local _pkgname="$(getpkgname ${pkgfile})"
		local _pkgarch="$(getpkgarch ${pkgfile})"
		mkdir -p "${repo}/${_pkgarch}/${_pkgbase}"
		echo "${_pkgname}" >> "${repo}/${_pkgarch}/${_pkgbase}/staging"

		if [ ! -f "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}" ]; then
			mkdir -p "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}"
			svn export -q "${SVNREPO}/${_pkgbase}/repos/${repo}-${_pkgarch}/PKGBUILD" \
				"${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}" >/dev/null
			[ $? -ge 1 ] && return 1
		fi

		local svnnames=($(. "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}"; echo ${pkgname[@]}))
		for svnname in ${svnnames[@]}; do
			echo "${svnname}" >> "${repo}/${_pkgarch}/${_pkgbase}/svn"
		done
	done
	popd >/dev/null

	for pkgdir in "${WORKDIR}/check_splitpkgs/${repo}"/*/*; do
		[ ! -d "${pkgdir}" ] && continue
		sort -u "${pkgdir}/staging" -o "${pkgdir}/staging"
		sort -u "${pkgdir}/svn" -o "${pkgdir}/svn"
		if [ ! -z "$(comm -13 "${pkgdir}/staging" "${pkgdir}/svn")" ]; then
			return 1
		fi
	done

	return 0
}

check_pkgrepos() {
	local pkgfile=$1

	local pkgname="$(getpkgname ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgver="$(getpkgver ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgarch="$(getpkgarch ${pkgfile})"
	[ $? -ge 1 ] && return 1

	[ -f "${FTP_BASE}/${PKGPOOL}/${pkgname}-${pkgver}-${pkgarch}"${PKGEXT} ] && return 1
	[ -f "${FTP_BASE}/${PKGPOOL}/$(basename ${pkgfile})" ] && return 1

	local repo
	local arch
	for repo in ${PKGREPOS[@]}; do
		for arch in ${ARCHES[@]}; do
			[ -f "${FTP_BASE}/${repo}/os/${arch}/${pkgname}-${pkgver}-${pkgarch}"${PKGEXT} ] && return 1
			[ -f "${FTP_BASE}/${repo}/os/${arch}/$(basename ${pkgfile})" ] && return 1
		done
	done

	return 0
}

#usage: chk_license ${license[@]}"
chk_license() {
	local l
	for l in ${@}; do
		in_array ${l} ${ALLOWED_LICENSES[@]} && return 0
	done

	return 1
}

check_repo_permission() {
	local repo=$1

	[ ${#PKGREPOS[@]} -eq 0 ] && return 1
	[ -z "${PKGPOOL}" ] && return 1

	in_array "${repo}" ${PKGREPOS[@]} || return 1

	[ -w "$FTP_BASE/${PKGPOOL}" ] || return 1

	local arch
	for arch in ${ARCHES}; do
		local dir="${FTP_BASE}/${repo}/os/${arch}/"
		[ -w "${dir}" ] || return 1
		[ -f "${dir}"${repo}${DBEXT} -a ! -w "${dir}"${repo}${DBEXT} ] && return 1
	done

	return 0
}

set_repo_permission() {
	local repo=$1
	local arch=$2
	local dbfile="${FTP_BASE}/${repo}/os/${arch}/${repo}${DBEXT}"

	if [ -w "${dbfile}" ]; then
		local group=$(/usr/bin/stat --printf='%G' "$(dirname "${dbfile}")")
		chgrp $group "${dbfile}" || error "Could not change group of ${dbfile} to $group"
		chmod g+w "${dbfile}" || error "Could not set write permission for group $group to ${dbfile}"
	else
		error "You don't have permission to change ${dbfile}"
	fi
}