#!/usr/bin/env bash

if [[ ! ${QUERY_STRING} ]]; then
	echo "Script must be run through CGI" >&2
	exit 1
fi

main() {
	local qs=${QUERY_STRING}
	local repo=${qs%%;*}
	qs=${qs#*;}
	local commit=${qs%%;*}
	qs=${qs#*;}
	local file=${qs%%;*}
	[[ ${qs} == *\;* ]] && qs=${qs#*;} || qs=

	local filter_maint= projects=
	while [[ -n ${qs} ]]; do
		local q=${qs%%;*}
		case ${q} in
			maintainer=*)
				filter_maint="--maintainer ${q#maintainer=}"
				;;
			include-projects)
				projects=--projects
				;;
			pkg=*)
				pkgs=${q#pkg=}
				filter_pkg="--pkg ${pkgs//://}"
				;;
		esac
		[[ ${qs} == *\;* ]] && qs=${qs#*;} || qs=
	done

	if [[ ${repo} == */* ]]; then
		echo "DANGER! SOMEONE TRIES TO ABUSE ME!" >&2
		exit 1
	fi

	local topdir=$(dirname "${0}")/..

	if ! cd "${topdir}/htdocs/output/${repo}" 2>/dev/null; then
		echo "Status: 404 Not Found"
		echo
		echo "404 Not Found"
		exit 0
	fi

	# generate HTML from XML
	local verbose=
	local lfile=${file}
	if [[ ${file} == *.verbose.html ]]; then
		file=${file%.verbose.html}.html
		verbose=--verbose
	fi
	[[ ${file} == *.html ]] && lfile=${file%.html}.xml

	local tree=( $(git ls-tree "${commit}" "${lfile}" 2>/dev/null) )
	if [[ ! ${tree[*]} ]]; then
		# fallback for stuff without .xml
		lfile=${file}
		tree=( $(git ls-tree "${commit}" "${lfile}" 2>/dev/null) )
		if [[ ! ${tree[*]} ]]; then
			echo "Status: 503 Service Unavailable"
			echo "Retry-After: 30"
			echo
			echo "404 Not Found (if the report was just published, you may need to wait a minute or two for sync)"
			exit 0
		fi
	fi

	local revarg=
	[[ ${commit} != HEAD ]] && revarg="--revision ${commit}"

	local ct
	case "${file}" in
		*.css) ct=text/css;;
		*.html) ct=text/html;;
		*.xml) ct=application/xml;;
		*) ct=text/plain;;
	esac

	echo "Content-Type: ${ct}"
	echo
	if [[ ${file} == *.html && ${lfile} == *.xml ]]; then
		local ts=$(TZ=UTC git log --format='%cd' --date=iso-local -1 | cut -d' ' -f1-2)

		git cat-file -p "${tree[2]}" \
			| PYTHONIOENCODING=utf8 python \
			"${topdir}"/pkgcheck2html/pkgcheck2html.py ${verbose} \
			-x "${topdir}"/pkgcheck2html/excludes.json \
			${filter_maint} ${projects} ${filter_pkg} -t "${ts}" -
	else
		git cat-file -p "${tree[2]}"
	fi
}

main