#!/bin/bash
PROGRAM_NAME=""$(basename "$0")

if [ $1 == "-a" ]; then
	STACK_NAME=$2
	shift 2
fi

if [ -z "$STACK_NAME" ]; then
	echo "$(tput setaf 1)ERROR: \$STACK_NAME must be set (e.g. export STACK_NAME=my_cool_app)$(tput sgr0 )"
	exit
fi

if type direnv > /dev/null 2>&1 && ! direnv status | grep -q 'Found RC allowed true'; then
	echo "$(tput setaf 1)ERROR: direnv is blocked, run direnv allow$(tput sgr0)"
	exit
fi

sub_help(){
	echo "Usage: $PROGRAM_NAME [-a STACK_NAME] <subcommand> [options]"
	echo ""
	echo "Subcommands:"
	echo "    run SERVICE [CMD]                     run a command in the specified service's container"
	echo "    secret_generate SECRET VERSION [CMD]  generate a secret, store it in pass & as a Docker secret"
	echo "    deploy [COMPOSE_FILE]                 let 'em rip"
	echo "    logs SERVICE                          tail logs from a deployed service"
	echo ""
		echo "Make sure \$STACK_NAME is set (probably using direnv)"
}

sub_secret_generate(){
	SECRET=$1
	VERSION=$2
	PW=${3:-pwqgen}

	if [ -z "$SECRET" ] || [ -z "$VERSION" ]; then
		echo "Usage: $PROGRAM_NAME secret_generate SECRET VERSION"
		exit
	fi

	$PW | tee \
		>(docker secret create "${STACK_NAME}_${SECRET}_${VERSION}" -) \
		>(pass insert "hosts/autonomic-swarm/${STACK_NAME}/${SECRET}" -m)
}

sub_run(){
	SERVICE=$1
	SH=${2:-/bin/sh}

	if [ -z "$SERVICE" ]; then
		echo "Usage: $PROGRAM_NAME run SERVICE [CMD]"
		exit
	fi

	CONTAINER=$(docker container ls --format "table {{.ID}},{{.Names}}" \
		| grep "${STACK_NAME}_${SERVICE}" | cut -d',' -f1)

	if [ -z "$CONTAINER" ]; then
		echo "Container not found! 🚨"
		exit
	fi

	docker exec -it "$CONTAINER" "$SH"

	return
}

sub_deploy (){
	COMPOSE=${1:-compose.yml}

	echo "About to deploy:"
	echo "  Compose: $(tput setaf 3)${PWD}/${COMPOSE}$(tput sgr0)"
	echo "  Domain: $(tput setaf 2)${DOMAIN}$(tput sgr0)"
	echo "  Stack: $(tput setaf 1)${STACK_NAME}$(tput sgr0)"

	read -rp "Continue? (y/[n])? " choice

	case "$choice" in
		y|Y ) ;;
		n|N ) return;;
		* ) return;;
	esac

	if docker stack deploy -c "$COMPOSE" "$STACK_NAME"; then
		echo "$(tput setaf 2)Yay! App should be available at https://${DOMAIN}$(tput sgr0)"
	else
		echo "$(tput setaf 1)Oh no! Something went wrong 😕 Check errors above$(tput sgr0)"
	fi
}

sub_logs (){
	SERVICE=$1

	docker service logs "${STACK_NAME}_${SERVICE}" \
		--follow \
		--no-trunc \
		--details \
		--timestamps
}

subcommand=$1
case $subcommand in
	"" | "-h" | "--help")
		sub_help
		;;
	*)
		shift
		"sub_${subcommand}" "$@"
		if [ $? = 127 ]; then
			echo "Error: '$subcommand' is not a known subcommand." >&2
			echo "       Run '$PROGRAM_NAME --help' for a list of known subcommands." >&2
			exit 1
		fi
		;;
esac