#!/usr/bin/env bash

TAPM_CONFIG_FILE="${TAPM_CONFIG_FILE:-/etc/ta-proxmenu/config.env}"

TAPM_CONFIG_READ_VALUE() {
	local key="$1"
	local value=''

	if [[ -r "$TAPM_CONFIG_FILE" ]]; then
		value="$(
			sed -n "s/^[[:space:]]*${key}[[:space:]]*=[[:space:]]*//p" \
				"$TAPM_CONFIG_FILE" |
				tail -n 1
		)"
		value="${value#\"}"
		value="${value%\"}"
		value="${value#\'}"
		value="${value%\'}"
	fi
	printf '%s' "$value"
}

TAPM_VALID_BROKER_ORIGIN() {
	[[ "${1:-}" =~ ^https://[A-Za-z0-9.-]+(:[0-9]+)?/?$ ]]
}

TAPM_VALID_GITEA_DOMAIN() {
	[[ "${1:-}" =~ ^[A-Za-z0-9.-]+(:[0-9]+)?$ ]]
}

TAPM_LOAD_RUNTIME_CONFIG() {
	if [[ -z "${TAPM_BROKER_URL:-}" ]]; then
		TAPM_BROKER_URL="$(TAPM_CONFIG_READ_VALUE TAPM_BROKER_URL)"
	fi
	if [[ -z "${GITEA_DOMAIN:-}" ]]; then
		GITEA_DOMAIN="$(TAPM_CONFIG_READ_VALUE GITEA_DOMAIN)"
	fi

	TAPM_BROKER_URL="${TAPM_BROKER_URL:-}"
	TAPM_BROKER_URL="${TAPM_BROKER_URL%/}"
	GITEA_DOMAIN="${GITEA_DOMAIN:-}"
	if TAPM_VALID_GITEA_DOMAIN "$GITEA_DOMAIN"; then
		GITEA_URL="https://${GITEA_DOMAIN}"
	else
		GITEA_URL=''
	fi
}

TAPM_ENSURE_RUNTIME_CONFIG() {
	local broker_url
	local config_dir
	local gitea_domain
	local input_device='/dev/tty'
	local temporary_file

	TAPM_LOAD_RUNTIME_CONFIG
	if [[ -r "$TAPM_CONFIG_FILE" ]] &&
		TAPM_VALID_BROKER_ORIGIN "$TAPM_BROKER_URL" &&
		TAPM_VALID_GITEA_DOMAIN "$GITEA_DOMAIN"; then
		return 0
	fi

	if [[ "${TAPM_CONFIG_TEST_STDIN:-0}" == 1 ]]; then
		input_device='/dev/stdin'
		exec 3>&2
	elif [[ ! -r /dev/tty || ! -w /dev/tty ]]; then
		printf 'TA-ProxMenu requires %s with TAPM_BROKER_URL and GITEA_DOMAIN.\n' \
			"$TAPM_CONFIG_FILE" >&2
		return 1
	else
		exec 3>/dev/tty
	fi

	printf '\nTA-ProxMenu V2 requires deployment service configuration.\n' \
		>&3
	while true; do
		printf 'TAPM broker HTTPS origin (example: https://tapm.example.com): ' \
			>&3
		IFS= read -r broker_url <"$input_device" || return 1
		broker_url="${broker_url%/}"
		TAPM_VALID_BROKER_ORIGIN "$broker_url" && break
		printf 'Enter an HTTPS origin without a path.\n' >&3
	done
	while true; do
		printf 'Gitea hostname (example: git.example.com): ' >&3
		IFS= read -r gitea_domain <"$input_device" || return 1
		TAPM_VALID_GITEA_DOMAIN "$gitea_domain" && break
		printf 'Enter a hostname without https:// or a path.\n' >&3
	done

	config_dir="${TAPM_CONFIG_FILE%/*}"
	[[ "$config_dir" != "$TAPM_CONFIG_FILE" ]] || config_dir='.'
	mkdir -p "$config_dir" || return 1
	temporary_file="$(mktemp "${TAPM_CONFIG_FILE}.tmp.XXXXXX")" || return 1
	if ! {
		printf 'TAPM_BROKER_URL=%s\n' "$broker_url"
		printf 'GITEA_DOMAIN=%s\n' "$gitea_domain"
	} >"$temporary_file" ||
		! chmod 0600 "$temporary_file" ||
		! mv -f "$temporary_file" "$TAPM_CONFIG_FILE"; then
		rm -f "$temporary_file"
		return 1
	fi

	TAPM_BROKER_URL="$broker_url"
	GITEA_DOMAIN="$gitea_domain"
	GITEA_URL="https://${GITEA_DOMAIN}"
	printf 'Saved TA-ProxMenu configuration to %s.\n\n' "$TAPM_CONFIG_FILE" \
		>&3
	exec 3>&-
}