#!/usr/bin/env sh

# POSIX shell implementation of Gitrect
#
# Operate on a tempfile and generate a listing of:
#
# prefix-trim-directory,remote=URL,...
#
# For all directories found in $WORKDIR
#
if [ ! "$(command -v git)" ]; then
	echo "git command not found. git must be installed and available in \$PATH to continue"
	exit 1
fi

# Reset all variables that might be set
DEFAULT_STATE="$HOME/.local/share/git/repolist"
WORKDIR="$HOME/.code"
verbose=0 # Variables to be evaluated as shell arithmetic should be initialized to a default or validated beforehand.
GITVER="$(git version | cut -d " " -f 3)"

usage="$(basename "$0") [-h] [-v -w WORKDIR -f FILE]

Set remotes for all git repos and pull new changes where:
    -w  set the (base) working directory (default: ${WORKDIR})
    -f  set the git list file (default: ${DEFAULT_STATE})

    -h  show this help text
    -v  increase output verbosity
"

while :; do
	case $1 in
	-h | -\? | --help) # Call a "show_help" function to display a synopsis, then exit.
		echo "$usage"
		exit
		;;
	-f) # Takes an option argument, ensuring it has been specified.
		if [ -n "$2" ]; then
			DEFAULT_STATE="$2"
			shift
		fi
		;;
	-f=?*)
		DEFAULT_STATE=${1#*=} # Delete everything up to "=" and assign the remainder.
		;;
	-f=) # Handle the case of an empty --file=
		printf 'ERROR: "-f" requires a non-empty option argument.\n' >&2
		exit 1
		;;
	-w) # Takes an option argument, ensuring it has been specified.
		if [ -n "$2" ]; then
			WORKDIR="$2"
			shift
		fi
		;;
	-w=?*)
		WORKDIR=${1#*=} # Delete everything up to "=" and assign the remainder.
		;;
	-w=) # Handle the case of an empty --file=
		printf 'ERROR: "-w" requires a non-empty option argument.\n' >&2
		exit 1
		;;
	-v)
		verbose=$((verbose + 1)) # Each -v argument adds 1 to verbosity.
		;;
	--) # End of all options.
		shift
		break
		;;
	-?*)
		printf 'WARN: Unknown option (ignored): %s\n' "$1" >&2
		;;
	*) # Default case: If no more options then break out of the loop.
		break ;;
	esac
	shift
done

# No posix-compliant way of getting separator, so leverage OS-specifics
FS_SEPARATOR="/"
# Don't care about windows, will figure it out another day

while read -r line; do
	dir=$(echo "$line" | cut -d, -f 1)
	remlist=$(echo "$line" | cut -d, -f 2-)
	clone=0 #False
	if [ $verbose -gt 0 ]; then
		echo "Operating on ${WORKDIR}${FS_SEPARATOR}${dir}"
	fi
	if [ ! -d "${WORKDIR}${FS_SEPARATOR}${dir}" ]; then
		#clone repo
		clone=$((clone + 1)) # Set true
		mkdir -p "${WORKDIR}${FS_SEPARATOR}${dir}"
	fi
	cd "${WORKDIR}${FS_SEPARATOR}${dir}" || exit
	if [ $clone -gt 0 ]; then
		if [ ${GITVER} \> "2.45" ]; then
			git init --ref-format=reftable
		else
			git init
		fi
	fi
	if [ $verbose -gt 1 ]; then
		echo "Remote url: ${remlist}"
	fi
	localRemotes=$(eval "git remote")
	len_localRemotes=${#localRemotes}
	echo "${remlist}" | awk -F ',' '{for (i = 1; i <= NF; i++) {printf "%s \n", $i}; printf "\n"}' | while read -r r || [ -n "$r" ]; do
		remoteName=$(echo "$r" | awk -F'=' '{print $1}') # Just get the remote name
		# Allow for blank / newlines during processing
		if [ "${remoteName}" = "" ]; then continue; fi

		if [ $len_localRemotes -gt 0 ]; then
			remExistsCheck=$(eval "git config remote.${remoteName}.url")
			if [ "${remExistsCheck}" = "" ]; then
				if [ $verbose -gt 0 ]; then
					echo "Adding remote ${r}"
				fi
				echo "$r" | awk -F'=' '{ print $1, $2; }' | xargs -n 2 git remote add
			else
				if [ $verbose -gt 0 ]; then
					echo "Setting remote ${r}"
				fi
				echo "$r" | awk -F'=' '{ print $1, $2; }' | xargs -n 2 git remote set-url
			fi
		else
			# Remotes not set locally
			if [ $verbose -gt 0 ]; then
				echo "Adding remote ${r}"
			fi
			echo "$r" | awk -F'=' '{ print $1, $2; }' | xargs -n 2 git remote add
		fi
	done
	if [ $verbose -gt 1 ]; then
		echo "Listed remotes for ${dir} are:"
		git remote -v
	fi
	if [ $clone -gt 0 ]; then
		git fetch --all
		rev=$(git ls-remote origin | grep HEAD | cut -f 1)
		if [ $verbose -gt 0 ]; then
			echo "Rev: ${rev}"
		fi
		br=$(git ls-remote origin | grep "${rev}" | grep -v HEAD | cut -f 2 | cut -d / -f 3 | head -n 1)
		if [ "$verbose" -gt 0 ]; then
			echo "Branch: ${br}"
		fi
		git switch "$br"
	fi
done <"$DEFAULT_STATE"

# Re-run confgit if it exists
if [ "$(command -v confgit.sh)" ]; then
	confgit.sh
fi

# Update all remotes if we have the fetchgit command
if [ "$(command -v fetchgit)" ]; then
	if [ "$verbose" -gt 0 ]; then
		find "$WORKDIR" -name ".git" -exec fetchgit -v {} \;
	else
		find "$WORKDIR" -name ".git" -exec fetchgit {} \;
	fi
fi