#!/bin/sh
# vim: set ft=sh:

# Set defaults
BASEDIR="$(pwd)"
ACTION="watch"
DOCKER_IMAGE=glenux/teaching-boilerplate:latest
DOCKER_OPT_TTY="-t"

# Parse arguments
while [ $# -gt 0 ]; do
	ARG="${1:-}"
	OPT="${2:-}"
	shift

	# echo "DEBUG: ARG=$ARG OPT=$OPT"

	case "$ARG" in
	-d|--data-dir) 
		shift # argument requires a parameter
		if [ -z "$OPT" ]; then
			>&2 echo "ERROR: missing argument for --data-dir"
			exit 1
		fi
		if [ ! -d "$OPT" ]; then
			>&2 echo "ERROR: argument for --data-dir must be a directory"
			exit 1
		fi
		BASEDIR="$(cd "$OPT" && pwd)"
		;;
	-a|--action)
		shift # argument requires a parameter
		if [ -z "$OPT" ]; then
			>&2 echo "ERROR: missing argument for --action"
			exit 1
		fi
		ACTION="$OPT"
		;;
	-T|--no-tty)
		DOCKER_OPT_TTY=""
		;;
	-h|--help)
		echo "Usage: $0 [options]"
		echo ""
		echo "-d, --data-dir DIR     Content directory"
		echo "-a, --action ACTION    Action (watch, build, shell, etc.)"
		echo "-t, --tty              Enable TTY mode (needed for shell)"
		echo "-h, --help             Show this help"
		;;
	*) 
		>&2 echo "ERROR: unknown option '$ARG'"
		exit 1
		;;
	esac
done

echo "basedir      = $BASEDIR"
echo "docker_image = $DOCKER_IMAGE"
echo "action       = $ACTION"

if [ -f "$BASEDIR/.marp/theme.scss" ]; then
	DOCKER_OPT_MARP_THEME="-v $BASEDIR/.marp:/app/.marp"
	echo "Theme: detected Marp files. Adding option to command line ($DOCKER_OPT_MARP_THEME)"
else
	echo "Theme: no theme detected. Using default files"
fi

if [ -f "$BASEDIR/mkdocs.yml" ]; then
	DOCKER_OPT_MKDOCS_CONFIG="-v $BASEDIR/mkdocs.yml:/app/mkdocs.yml"
	echo "Mkdocs: detected mkdocs.yml file. Adding option to command line ($DOCKER_OPT_MKDOCS_CONFIG)"
else
	echo "Mkdocs: no mkdocs.yml detected. Using default files"
fi

if [ -d "$BASEDIR/slides" ]; then
	DOCKER_OPT_MARP_PORT="-p 5200:5200"
fi

if [ -d "$BASEDIR/docs" ]; then
	DOCKER_OPT_MKDOCS_PORT="-p 5100:5100"
fi

set -x
docker run -i $DOCKER_OPT_TTY \
	--shm-size=1gb \
	-e "EXT_UID=$(id -u)" \
	-e "EXT_GID=$(id -g)" \
	-v "$BASEDIR/docs:/app/docs" \
	-v "$BASEDIR/slides:/app/slides" \
	-v "$BASEDIR/images:/app/images" \
	-v "$BASEDIR/_build:/app/_build" \
	$DOCKER_OPT_MKDOCS_CONFIG \
	$DOCKER_OPT_MARP_THEME \
	$DOCKER_OPT_MKDOCS_PORT \
	$DOCKER_OPT_MARP_PORT \
	"$DOCKER_IMAGE" "$ACTION"
set +x

# TODO: ask current user permissions
# TODO: fix permissions on generated files