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

# Set defaults
BASEDIR="$(pwd)"
BASEHASH="$(echo "$BASEDIR" |sha256sum |head -c7)"
ACTION="watch"
VERBOSITY="0"
DOCKER_IMAGE=glenux/docmachine:latest
DOCKER_OPT_TTY="-t"

gxt_usage() {
	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 "-v, --verbose          Enable verbosity"
	echo "-h, --help             Show this help"
}

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

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

	case "$ARG" in
	-a|--action)
		shift # argument requires a parameter
		if [ -z "$OPT" ]; then
			>&2 echo "ERROR: missing argument for --action"
			exit 1
		fi
		ACTION="$OPT"
		;;
	-d|--data-dir) 
		shift # argument requires a parameter
		if [ -z "$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 "$OPT" && pwd)"
		;;
	-h|--help)
		>&2 gxt_usage
		exit 0
		;;
	-T|--no-tty)
		DOCKER_OPT_TTY=""
		;;
	-v|--verbosity)
		VERBOSITY="$((VERBOSITY+1))"
		;;
	*) 
		>&2 gxt_usage
		>&2 echo "ERROR: unknown option '$ARG'"
		exit 1
		;;
	esac
done

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

## Detect Marp SCSS
if [ -f "$BASEDIR/.marp/theme.scss" ]; then
	eval DOCKER_OPT_MARP_THEME="-v \"$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

## Detect Mkdocs configuration - old format (full)
if [ -f "$BASEDIR/mkdocs.yml" ]; then
	>&2 echo "Mkdocs: detected mkdocs.yml file. Please rename to mkdocs-patch.yml"
	exit 1
fi

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

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

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

if [ "$VERBOSITY" -gt 0 ]; then
	set -x
fi

DOCKER_NAME="docmachine-$BASEHASH"
DOCKER_CID="$(docker ps -f "name=$DOCKER_NAME" -q)"

if [ -n "$DOCKER_CID" ]; then
	docker kill "$DOCKER_NAME"
fi

docker run -i $DOCKER_OPT_TTY \
	--name "$DOCKER_NAME" \
	--rm \
	--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"

if [ "$VERBOSITY" -gt 0 ]; then
	set +x
fi