#!/bin/sh

# ----------------- Helper functions

log()
{
	echo $@
}

err()
{
	log $@
}

fatal()
{
	err $@
	exit 1
}

marker()
{
	log "# ------------- [$cur/$n_projects] $@"
}

fat_marker()
{
	log "# ==================================================== [$cur/$n_projects] $@"
}

#
# Guess and set the following global variables:
#
# - projects_dir: The directory all projects are contained in
# - project_dirs: A space separated list of all directories containing a project
# - n_projects: the number of projects
#
set_global_variables()
{
	[ "$projects_dir" ] || {
		projects_dir=`pwd`
		# If we're in a toplevel directory, suppose projects_dir == project_dirs,
		# i.e. we only want to target this Git repo
		if [ ! -d .git ]; then
			while [ ! -r Makefile ] || ! grep -q some-random-string-to-id-this-makefile Makefile; do
				[ "$projects_dir" = / ] && fatal "Failed to find projects directory"
				projects_dir=`dirname $projects_dir`
			done
		fi
	}

	[ "$project_dirs" ] || {
		project_dirs=`(cd $projects_dir; ls -d */.git 2>/dev/null | sed 's%/.git%%')`
	}
	n_projects=`echo $project_dirs | wc -w`
}

run_git()
{
	marker git "$@"
	git "$@"
}

# ----------------- Commands

cmd_run()
(
	local d
	local cmd=$1
	shift

	set_global_variables
	cd $projects_dir

	if [ "$PGIT_KEEP_GOING" != y ]; then set -e; fi
	for d in $project_dirs; do
		cur=`expr $cur + 1`
		run_git -C $d $cmd "$@"
	done
)

cmd_commit()
(
	local d do_cvs

	if [ "$1" = --cvs ]; then
		do_cvs=true
		shift
	fi

	set_global_variables
	cd $projects_dir

	if [ "$PGIT_KEEP_GOING" != y ]; then set -e; fi
	for d in $project_dirs; do
		cur=`expr $cur + 1`
		if run_git -C $d diff-index --quiet HEAD --; then
			log "Nothing to commit"
			continue
		fi
		run_git -C $d commit "$@"
	done
)

cmd_clone()
(
	run_clone() {
		local url="$1"
		local p="$2"
		run_git $GIT_GLOBAL_OPTS clone "$url" "$p"
		if [[ "$GIT_GLOBAL_OPTS" =~ proactiveAuth ]]; then
			run_git -C $p config set http.proactiveAuth basic
		fi
	}

	local remote_base="$global_remote_base"
	local remote_subpath="$global_remote_subpath"
	local whoami="$(id -un)"
	set_global_variables
	cd $projects_dir
	local projects="$PGIT_CLONE_PROJECTS"
	local ignore="$PGIT_IGNORE"
	local thisdir="${0%/*}"
	local jw_projects="/usr/bin/python3 $thisdir/jw-pkg.py"
	local create_remote_user_repos=false
	local long_opts="create-remote-user-repos"
	local refspec=()
	long_opts="$long_opts,refspec:"
	local login="$whoami"
	[ "$remote_user" ] && login="$remote_user"

	local opts
	opts=$(getopt -o C --long "$long_opts" -n clone -- "$@") || fatal "Failed to parse options $@"
	eval set -- "$opts"
	while [ "$1" != -- ]; do
	case "$1" in
		-C | --create-remote-user-repos)
			create_remote_user_repos=true
			;;
		--refspec)
			refspec=(${2//:/ })
			shift
			;;
		*)
			fatal "Unknown option $1"
			;;

	esac
	shift
	done

	local fromuser="${refspec[0]}"
	local fromref="${refspec[1]}"
	local toref="${refspec[2]}"
	[ "$fromuser" ] || fromuser=$whoami
	[ "$fromref" ] || fromref=master
	local git_srv_admin="$SSH $login@git.janware.com /opt/jw-pkg/bin/git-srv-admin.sh"

	if [ -z "$projects" ]; then
		projects=`$jw_projects projects list-repos --from-user $fromuser $remote_base`
		[ "$?" != 0 ] && exit 1
	fi

	if [ "$login" ]; then
		[ "${remote_base/@/}" = "${remote_base}" ] || fatal "Specified both --login $login and user in URL $remote_base"
		remote_base=$(echo $remote_base | sed "s|://|://$login@|")
	fi

	n_projects=`echo $projects | wc -w`
	if [ "$PGIT_KEEP_GOING" != y ]; then set -e; fi
	local project_dir
	for project_dir in $projects; do
		local project_name=$(readlink -f $project_dir | xargs basename)
		if echo $ignore | grep -q "\b$project_name\b"; then
			continue
		fi
		cur=`expr $cur + 1`
		local pullurl=$remote_base/$fromuser$remote_subpath/$project_name
		local pushurl=$remote_base/$login$remote_subpath/$project_name
		local curref=""
		fat_marker "Fetching project $project_name from user $fromuser"
		local remotename="jw-$fromuser"
		[ "$fromuser" = "$login" ] && remotename="origin"
		if [ -d $project_dir ]; then
			run_git -C $project_dir remote | grep -q "^$remotename$" || {
				run_git -C $project_dir remote add $remotename $pullurl
				[ "$fromuser" = "$login" ] || run_git -C $project_dir remote set-url --push $remotename no_push
			}
			run_git -C $project_dir fetch --prune --recurse-submodules=on-demand $remotename $fromref
			run_git -C $project_dir submodule foreach --recursive 'git fetch --tags -f origin'
			if [ "$toref" ]; then
				run_git -C $project_dir rebase --autostash $remotename/$fromref $toref
				run_git -C $project_dir merge --ff-only $remotename/$fromref $toref
			fi
		else
			run_clone $remote_base/$fromuser$remote_subpath/$project_name $project_dir
			if [ "$fromuser" != "$login" ]; then
				run_git -C $project_dir remote rename origin $remotename || fatal "Failed to rename remote in $project_dir"
				run_git -C $project_dir remote set-url --push $remotename no_push
				if [ $create_remote_user_repos = true ]; then
					$git_srv_admin -u $login -j create-personal-project $project_name
					run_git -C $project_dir remote add origin $pushurl
					run_git -C $project_dir push --recurse-submodules=on-demand origin master
					$git_srv_admin -u $login -j update-descriptions $project_name
					run_git -C $project_dir branch --set-upstream-to origin/master master
				fi
			fi
		fi
		run_git -C $project_dir submodule update --init --recursive || fatal "git submodule update failed in $project_dir"
	done
)

cmd_diff()
(
	local d
	set_global_variables
	cd $projects_dir
	for d in $project_dirs; do
		cur=`expr $cur + 1`
		# marker $d
		run_git -C $d diff --src-prefix=$d/ --dst-prefix=$d/ "$@"
	done
)

echo "running $0 $@ GIT_SSH=$GIT_SSH" >&2

cur=0
SSH=ssh
[ "$GIT_SSH" ] && SSH=$GIT_SSH
global_remote_base="ssh://git.janware.com/srv/git"

while [ "${1:0:1}" = - ]; do
	case "$1" in
		'--remote-base')
			global_remote_base="$2"
			shift
			;;
	esac
	shift
done

# Only janware.com ssh git supports subdirectories below users
if [[ "$global_remote_base" =~ git.janware.com ]]; then
	global_remote_subpath="/proj"
else
	global_remote_subpath=""
fi

cmd=$1
shift

while [ "${1:0:1}" = - ]; do
	case $1 in
		'--login')
			remote_user="$2"
			shift 2
			;;
		*)
			break
			;;
	esac
done

case $cmd in
	clone|diff|commit)
		cmd_${cmd//-/_} "$@"
		;;
	*)
		cmd_run $cmd "$@"
		;;
esac