#!/usr/bin/env bash

set -o errexit
set -o nounset

IMAGE=gamedl
CONTAINER=$IMAGE

function build_image () {
	echo "building $IMAGE..."
	# docker build --tag "$IMAGE" .

	docker build --tag "$IMAGE" - << EOF
FROM python:3-alpine
RUN apk add --no-cache git
RUN pip install itchiodl
WORKDIR /usr/src/humble-dl
RUN \
        git clone 'https://github.com/xtream1101/humblebundle-downloader.git' . &&\
        wget -O trovefix.patch 'https://patch-diff.githubusercontent.com/raw/xtream1101/humblebundle-downloader/pull/59.patch' &&\
        git apply trovefix.patch &&\
        pip install -e .
WORKDIR /dl
CMD echo "Usage: gamedl <hbd|itch-download|help|build> [<options>]"
EOF
}

function check_image () {
	if ! (docker image inspect "$IMAGE" >/dev/null); then
		echo "cannot access docker image $IMAGE, it probably does not exist."
		
		while true; do
			read -p "build image? [yn] " yn
			case $yn in
				[Yy]* ) build_image; exit ;;
				[Nn]* ) echo "bye"; exit ;;
				* )     echo "Please answer yes or no." ;;
			esac
		done
	fi
}

function run_image () {
	echo "mounting your local working dir as /dl"
	docker run -u $(id -u):$(id -g) -v $PWD:/dl -it --rm --name "$CONTAINER" "$IMAGE" "$@"
}

function show_help () {
	echo "Usage $0 <command> [<options>]

DESCRIPTION
	Run game platform downloaders in a docker container. Currently supported are:
	- Humble (https://pypi.org/project/humblebundle-downloader/)
	- Itch.io (https://pypi.org/project/itchiodl/)

	The downloaders run in a docker container with your current working dir
	mounted to /dl inside the container.

COMMANDS
	Every command except help and build get forwarded into the container,
	so you can run arbitrary commands if you know what you are doing.

	hbd
		Run the Humble downloader. Run 'gamedl hbd -h' for help.
	itch-download
		Run the Itch.io downloader. Run 'gamedl itch-download -h' for help.

	build
		(Re)build the gamedl-image.
	help
		That is what you are reading now.
"
}

cmd="help"
if [ $# -ge 1 ]; then
	cmd="$1"
fi

case "$cmd" in
	help | h | -h )
		show_help; exit ;;
	build )
		build_image; exit ;;
	* )
		run_image $@; exit ;;
esac