#!/bin/bash
# Based on ksp/web/tools/deploy
set -e

die ()
{
	echo >&2 "ERROR: $1"
	exit 1
}

get_git_branch ()
{
	CURRENT_BRANCH=$(git symbolic-ref --short HEAD) || die "HEAD is not a symbolic ref. Your head is probably detached."
}

check_git_pushed ()
{
	if ! $(git diff --quiet) || ! $(git diff --cached --quiet) ; then
		if [ -n "$KSP_FORCE_DIFF" ] ; then
			echo "## WARNING: There are uncommitted changes, but KSP_FORCE_DIFF makes us proceed."
		else
			git status
			die "There are uncommitted changes. Set KSP_FORCE_DIFF=1 if you really want to install."
		fi
	fi
	if [ $(git rev-parse $CURRENT_BRANCH) != $(git rev-parse origin/$CURRENT_BRANCH) ] ; then
		if [ -n "$KSP_FORCE_PUSHED" ] ; then
			echo "## WARNING: There are unpushed changes, but KSP_FORCE_PUSHED makes us proceed."
		else
			die "There are unpushed changes. Set KSP_FORCE_PUSHED=1 if you really know what you are doing."
		fi
	fi
}

check_git_branch ()
{
	local NEED=$1
	if [ $CURRENT_BRANCH != $NEED ] ; then
		if [ -n "$KSP_FORCE_BRANCH" ] ; then
			echo "## WARNING: Not on branch $NEED, but KSP_FORCE_BRANCH makes us proceed."
		else
			die "Public web must be installed from branch '$NEED'. Set KSP_FORCE_BRANCH=1 if you really want to install from '$CURRENT_BRANCH'."
		fi
	fi
}

QUICK=
if [ "$1" = "--quick" ] ; then
	QUICK=1
	shift
fi

if [ $# -ne 1 -a $# -ne 2 -o "${1:0:1}" = "-" ] ; then
	echo >&2 "Usage: $(basename $0) [--quick] <instance> [<commit>]"
	exit 1
fi
INST="$1"
COMMIT="$2"
get_git_branch

case "$INST" in
	test)	REMOTE_LOGIN="ksp-web@gimli.ms.mff.cuni.cz"
		REMOTE_PATH=/akce/ksp/testweb
		;;
	pub)	REMOTE_LOGIN="ksp-web@gimli.ms.mff.cuni.cz"
		REMOTE_PATH=/akce/ksp/web
		check_git_branch master
		;;
	*)	die "Unknown web instance $INST."
		;;
esac

if [ -z "$COMMIT" ] ; then
	COMMIT=$(git rev-parse HEAD)
	echo "## Installing branch $CURRENT_BRANCH (head $COMMIT) to web instance $INST"
else
	COMMIT=$(git rev-parse $COMMIT)
	echo "## Installing commit $COMMIT to web instance $INST"
fi
check_git_pushed
if [ -n "$QUICK" ] ; then
	echo "## WARNING: This is an incremental build"
fi

# XXX: Beware of quotes!
ssh -t $REMOTE_LOGIN "
	set -e
	cd $REMOTE_PATH
	echo '## Obtaining installation lock'
	# XXX: Keep in sync with ksp/tools/deploy
	if ! lockfile -1 -r10 $REMOTE_PATH/install.lock ; then
		echo '## Failed to obtain $REMOTE_PATH/install.lock, please check manually'
		exit 1
	fi
	install_unlock () {
		if [ -f $REMOTE_PATH/install.lock ] ; then
			echo '## Releasing installation lock'
			rm -f $REMOTE_PATH/install.lock
		fi
	}
	trap install_unlock SIGINT SIGHUP EXIT
	if [ -d src ] ; then
		echo '## Updating from repository'
		( cd kurz-src && git fetch )
	else
		echo '## Cloning repository'
		git clone --quiet --no-checkout git@gitea.ks.matfyz.cz:KSP/graf-uloh.git kurz-src
	fi
	echo '## Checking out files'
	if [ -z '$QUICK' ] ; then
		rm -rf kurz-src/*
		( cd kurz-src && git checkout --quiet $COMMIT && git reset --hard )
	else
		( cd kurz-src && git checkout --quiet $COMMIT )
	fi
	( cd kurz-src/frontend && tools/deploy-local )
"