const smpp = require("smpp");
const commandLineArgs = require("command-line-args");
const commandLineUsage = require("command-line-usage");
const { createLogger, format, transports } = require("winston");
const { combine, timestamp, label, printf } = format;
const NanoTimer = require("nanotimer");

const myFormat = printf(({ level, message, timestamp }) => {
	return `${timestamp} ${level}: ${message}`;
});

const logger = createLogger({
	format: combine(format.colorize(), timestamp(), myFormat),
	transports: [new transports.Console()],
});

function verifyExists(value, err) {
	if (!value) {
		logger.error(err);
		process.exit(0);
	}
}
function verifyDefaults(options) {
	for (const optionDefinition of optionDefinitions) {
		if (optionDefinition.defaultOption) {
			if (!options[optionDefinition.name]) {
				options[optionDefinition.name] = optionDefinition.defaultOption;
			}
		}
	}
}

const optionDefinitions = [
	{ name: "help", type: Boolean, description: "Display this usage guide." },
	{ name: "host", alias: "h", type: String, description: "The host (IP) to connect to." },
	{ name: "port", alias: "p", type: Number, description: "The port to connect to." },
	{ name: "systemId", alias: "s", type: String, description: "SMPP related login info." },
	{ name: "password", alias: "w", type: String, description: "SMPP related login info." },
	{
		name: "messageCount",
		type: Number,
		description: "Number of messages to send; Optional, defaults to 1.",
		defaultOption: 1,
	},
	{
		name: "mps",
		type: Number,
		description: "Number of messages to send per second",
		defaultOption: 999999,
	},
	{
		name: "source",
		type: String,
		description: "Source field of the sent messages.",
		defaultOption: "smppDebugClient",
	},
	{
		name: "destination",
		type: String,
		description: "Destination field of the sent messages.",
		defaultOption: "smpp",
	},
	{
		name: "message",
		type: String,
		description: "Text content of the sent messages.",
		defaultOption: "smpp debug message",
	},
	{ name: "debug", type: Boolean, description: "Display all traffic to and from the client; Debug mode." },
];

const options = commandLineArgs(optionDefinitions);

if (options.help) {
	const usage = commandLineUsage([
		{
			header: "CLI SMPP (Client)",
		},
		{
			header: "Options",
			optionList: optionDefinitions,
		},
		{
			content: "Project home: {underline https://github.com/PhatDave/SMPP_CLI}",
		},
	]);
	console.log(usage);
	process.exit(0);
}

verifyDefaults(options);
verifyExists(options.host, "Host can not be undefined or empty! (--host)");
verifyExists(options.port, "Port can not be undefined or empty! (--port)");
verifyExists(options.systemId, "SystemID can not be undefined or empty! (--systemId)");
verifyExists(options.password, "Password can not be undefined or empty! (--password)");

let sent = 0;
let success = 0;
let failed = 0;
const sendTimer = new NanoTimer();
logger.info(`Connecting to ${options.host}:${options.port}...`);
const session = smpp.connect(
	{
		url: `smpp://${options.host}:${options.port}`,
		auto_enquire_link_period: 10000,
		debug: options.debug,
	},
	function () {
		logger.info(
			`Connected, sending bind_transciever with systemId '${options.systemId}' and password '${options.password}'...`
		);
		session.bind_transceiver(
			{
				system_id: options.systemId,
				password: options.password,
			},
			function (pdu) {
				if (pdu.command_status === 0) {
					logger.info(
						`Successfully bound, sending ${options.messageCount} messages '${options.source}'->'${options.destination}' ('${options.message}')`
					);
					sendTimer.setInterval(
						() => {
							if (sent >= options.messageCount) {
								logger.info("Finished sending messages, idling...");
								sendTimer.clearInterval();
							} else {
								logger.info(`Sending message ${sent + 1}/${options.messageCount}`);
								session.submit_sm(
									{
										source_addr: options.source,
										destination_addr: options.destination,
										short_message: options.message,
									},
									function (pdu) {
										if (pdu.command_status === 0) {
											logger.info(`Received response with id ${pdu.message_id}`);
											success++;
										} else {
											logger.warn(`Message failed with id ${pdu.message_id}`);
											failed++;
										}
									}
								);
								sent++;
							}
						},
						"",
						`${1 / options.mps} s`
					);
				}
			}
		);
	}
);

session.on("deliver_sm", function (pdu) {
	console.log("Got deliver_sm");
	session.send(pdu.response());
});

// Proccess sigint messages