#!/bin/bash
set -eo pipefail

source helper-functions

filter_options() {
	local options="$1"
	local valid_options="$2"
	local fallback="$3"

	local filtered=()
	for valid_option in $valid_options; do
		for option in $options; do
			if [ "$option" == "$valid_option" ]; then
				filtered+=("$option")
			fi
		done
	done

	local result="$(IFS=' '; echo "${filtered[*]}")"
	if [ "$result" == "" ]; then
		echo "$fallback"
	else
		echo "$result"
	fi
}

resolve_version_tags() {
	local latest_version=$(last_stable_version)
	local milestone_version="$(last_milestone_version)"
	if [ "$milestone_version" == "" ]; then
		milestone_version="$(last_stable_version)"
	fi
	local snapshot_version=$(last_snapshot_version)

	local results=()
	for s in $@; do
		local result="$s"
		if [ "$result" == "latest" ]; then
			result="$latest_version"
		elif [ "$result" == "milestone" ]; then
			result="$milestone_version"
		elif [ "$result" == "snapshot" ]; then
			result="$snapshot_version"
		fi
		results+=("$result")
	done

	echo "$(IFS=' '; echo "${results[*]}")"
}

print_help() {
	local snapshot_5x=$(grep -E '^5\.[0-9]+\.[0-9]+-snapshot$' <<< $VERSIONS | tail -n 1)
	local milestone_4x=$(grep -E '^4\.[0-9]+\.[0-9]+.(M[0-9]+)$' <<< $VERSIONS | tail -n 1)
	local stable_42x=$(grep -E '^4\.2\.[0-9]+$' <<< $VERSIONS | tail -n 1)
	local stable_43x=$(grep -E '^4\.3\.[0-9]+$' <<< $VERSIONS | tail -n 1)

	cat <<-EOI
Usage: ./build [OPTIONS]

Builds openHAB Docker images using BuildKit.

When no options are provided the latest snapshot images are build for all Docker platforms.
To build other versions or only the images of a specific base image add these to the options.
To push the images to the Docker registry ($(docker_repo)) add --push
Log in to the Docker Registry with "docker login" before building and pushing the images.

Examples:

Build the Debian and Alpine $snapshot_5x images:
    ./build

Build the Debian $snapshot_5x images:
    ./build debian

Build the Alpine $milestone_4x images:
    ./build $milestone_4x alpine

Build the $stable_43x and $stable_42x Debian/Alpine images and push them to $(docker_repo):
    ./build $stable_43x $stable_42x --push

Build the latest/snapshot Debian images by resolving the versions ("milestone" can also be resolved):
    ./build latest snapshot debian

EOI
}

main() {
	local versions=$(filter_options "$(resolve_version_tags "${*/-SNAPSHOT/-snapshot}")" "$VERSIONS" "$(last_snapshot_version)")
	local bases=$(filter_options "$*" "$(bases)" "$(bases)")
	local push=$(filter_options "$*" "--push" "")

	for version in $versions; do
		for base in $bases; do
			build $version $base $push
		done
	done
}

if [ "$1" == "-h" ] ||  [ "$1" == "--help" ]; then
	print_help
else
	main "$@"
fi