#!/bin/bash

# Gitea repositories mirrorer

rstc="\033[00m"
yellow="\033[1;33m"
blue="\033[1;36m"
red="\033[1;31m"

show_help() {
	echo -e "$(basename "$0") can be used to mirror all git repositories hosted on Gitea.\n"
	echo -e "USAGE: $(basename "$0") -u USER -g GIT_URL ?-d DIR?\n"

	echo -e "Command line arguments:"
	echo -e "    -h --help       show this help"
	echo -e "    -f --force      drop all existing local changes"
	echo -e "    -u --user       user name"
	echo -e "    -g --git        git url"
	echo -e "    -p --private    comma separated private repositories"
	echo -e "    -d --dir        directory for storing files (current working directory by default)"

	echo
	exit "${1:-0}"
}

die() {
	echo -e "${red}ERROR:${rstc} $*\n"

	show_help 1
}

git_update() {
	pushd "$1" >/dev/null

	[ -n "$FORCE" ] && git checkout . 2>&-

	git fetch
	git pull --all

	popd >/dev/null
}

#-------------------------------------------------------------------------------

UNKNOWN_ARGS=()

[ $# -eq 0 ] && show_help

while [[ $# -gt 0 ]]; do
	key="$1"

	case $key in
		-h|--help)    show_help;;
		-d|--dir)     DIRECTORY="$2"; shift; shift;;
		-u|--user)    USERNAME="$2";  shift; shift;;
		-g|--git)     GIT_URL="$2";   shift; shift;;
		-p|--private) PRIVATE="$2";   shift; shift;;
		-f|--force)   FORCE="true";   shift;;
		*)            UNKNOWN_ARGS+=("$1");  shift;;
	esac
done

[ ${#UNKNOWN_ARGS} -gt 0 ] && die "Unknown parameters: ${UNKNOWN_ARGS[*]}"
[ -z "${GIT_URL+x}"  ] && die "Unknown gitea URL. Use the --git cli parameter to specify it."
[ -z "${USERNAME+x}" ] && die "Unknown gitea user. Use the --user cli parameter to specify it."

#-------------------------------------------------------------------------------

[ -n "$DIRECTORY" ] && mkdir -p "$DIRECTORY" && cd "$DIRECTORY"

mapfile -t REPOSITORIES < <(curl -sq -L "$GIT_URL/api/v1/users/$USERNAME/repos" | jq -r '.[].clone_url')

if [ -n "$PRIVATE" ]; then
	for repository in $(tr ',' ' ' <<<"$PRIVATE"); do
		REPOSITORIES+=("https://${GIT_URL}/${USERNAME}/${repository}.git")
	done
fi

r=0

for repository in ${REPOSITORIES[*]}; do
	repo_name=$(sed 's/\.git.*$//' <<<"${repository##*/}")

	printf "\n${yellow}#### [%02d/%02d] ${blue}%s${rstc}\n" $((++r)) "${#REPOSITORIES[@]}" "$repo_name"

	if [ ! -d "$repo_name" ]; then
		git clone --progress "$repository"
	fi

	git_update "$repo_name"
done