"use strict";

import MqttClient from 'simple-mqtt-client';

class TTNAppServer {
	get connection_string() {
		return `${this.settings.ttn.tls ? "mqtts" : "mqtt"}://${this.settings.ttn.host}:${this.settings.ttn.port}/`
	}
	
	// Destructure the awilix container
	constructor({ settings, ansi, MessageHandler, log }) {
		this.settings = settings;
		/** @type {Ansi} */
		this.a = ansi;
		/** @type {Log} */
		this.log = log;
		/** @type {MessageHandler} */
		this.message_handler = MessageHandler;
	}
	
	async run() {
		if(this.settings.ttn.app_id == "CHANGE_THIS" || this.settings.ttn.access_key == "CHANGE_THIS") {
			this.log.error(`Error: No TTN app id specified. Try filling in the required values in settings.toml. If they don't exist yet, try using server/settings.default.toml as a reference.`);
			return false;
		}
		
		this.ttn_client = await this.connect();
		
		for(let device_name of this.settings.ttn.devices) {
			if(device_name == "CHANGE_THIS") {
				this.log.error(`Error: No device names specified. Try filling in the required values in settings.toml. If they don't exist yet, try using server/settings.default.toml as a reference.`);
				return false;
			}
			this.ttn_client.subscribe(`${device_name}/up`, this.handle_message.bind(this));
		}
		
		this.log.log(`Connected to ${this.connection_string}`);
	}
	
	connect() {
		return new Promise((resolve, _reject) => {
			this.log.log(`Connecting to ${this.connection_string}`);
			MqttClient.new().init(
				this.connection_string,
				this.settings.ttn.app_id,		// Username
				this.settings.ttn.access_key,	// Password
				`${this.settings.ttn.app_id}/devices`,	// Base topic
				(client) => {
					client;
					resolve(client);
				}
			);
		})
	}
	
	async handle_message(payload) {
		await this.message_handler.handle(payload);
	}
}

export default TTNAppServer;