#!/usr/bin/env bash

set -euo pipefail

msg() {
	printf "\033[32;1m%s:\033[m %s\n" 'info' "$*"
}

warn() {
	>&2 printf "\033[33;1m%s:\033[m %s\n" 'warning' "$*"
}

die() {
	>&2 printf "\033[31;1m%s:\033[m %s\n" 'error' "$*"
	exit 1
}

confirm() {
	local msg="$1"
	echo -n "$msg [y/N] "

	local confirm
	read -r confirm
	[[ "${confirm,,}" = 'y' ]]
}

phelp() {
	cat <<EOF
  ebil - ebil.club cli

usage:
  push | push your site files to ebil.club
    > ebil push --user robin dist/
  pull | pull your site from ebil.club to a local directory
    > ebil pull --user robin site/

env:
  you can set certain options using environment variables.

  EBIL_USER="robin"       | --user robin
  EBIL_PATH="dist/"       | push --from dist/
                            pull --to dist/
  EBIL_PATH_REMOTE="root" | push --to root
                            pull --from root
  EBIL_HOST="ebil.club"
  EBIL_REMOTE="/var/ebil.club/\${user}/\${path_remote}"

note:
  specify options *before* regular arguments.
EOF
	exit 0
}

sourceenv() {
	# shellcheck disable=SC2046
	[[ -f .env ]] && export $(grep -v '^#' .env | xargs -0) || return 0
}

checkfrom() {
	[[ -d "$1" ]] || die 'from does not exist'
}

rcopy() {
	local src="$1"
	local dst="$2"
	shift
	shift

	rsync -rltzq --progress "$@" "$src/" "$dst"
}

push() {
	local user="$1"
	local from="$2"
	local to="$3"
	local host="$4"
	local remote="$5"

	from="$(realpath "$from")"
	checkfrom "$from"

	if [[ -z "$remote" ]]; then
		msg 'user:' "$user"
		remote="/var/ebil.club/${user}/${to}"
	fi

	[[ -f "${from}/index.txt" ]] && msg 'custom curl message configured' "(${from}/index.txt)"
	[[ -f "${from}/index.html" ]] || warn 'index.html not found' "(${from}/index.html)"

	msg 'pushing to' "${user}@${host}:${to}" 'from' "$from"
	rcopy "$from" "${host}:${remote}" --delete --chmod=D755,F644
}

pull() {
	local user="$1"
	local from="$2"
	local to="$3"
	local host="$4"
	local remote="$5"

	to="$(realpath "$to")"

	if [ ! -d "$to" ]; then
		msg 'creating destination directory' "$to"
		mkdir -p "$to"
	fi

	if [[ -z "$(find "$to" -maxdepth 0 -empty)" ]]; then
		warn 'destination directory is not empty' "(${to})"
		confirm 'are you sure you want to use this directory?'
	fi

	if [[ -z "$remote" ]]; then
		msg 'user:' "$user"
		remote="/var/ebil.club/${user}/${from}"
	fi

	msg 'pulling from' "${user}@${host}:${from}" 'to' "$to"
	rcopy "${host}:${remote}" "$to"
}

main() {
	sourceenv

	local user="${EBIL_USER:-}"
	local host="${EBIL_HOST:-ebil.club}"
	local remote="${EBIL_REMOTE:-}"
	local path="${EBIL_PATH:-dist}"
	local path_remote="${EBIL_PATH_REMOTE:-root}"

	local cmd

	if [ "$#" -gt 0 ]; then
		cmd="${1#-}"
		shift
	fi

	local from
	local to

	while [ "$#" -gt 0 ]; do
		case "$1" in
		--user)
			user="$2"
			shift
			;;
		--from)
			from="$2"
			shift
			;;
		--to)
			to="$2"
			shift
			;;
		--help)
			phelp
			;;
		*) break ;;
		esac
		shift
	done

	if [[ -z "$user" ]]; then
		die 'no user specified'
	fi

	case "$cmd" in
	push)
		from="${from:-$path}"
		from="${1:-$from}"
		to="${to:-$path_remote}"

		push "$user" "$from" "$to" "$host" "$remote"
		;;
	pull)
		from="${from:-$path_remote}"
		to="${to:-$path}"
		to="${1:-$to}"

		pull "$user" "$from" "$to" "$host" "$remote"
		;;
	'') phelp ;;
	*) die 'command not found' ;;
	esac
}

main "$@"