import * as cluster from 'cluster';
import * as os from 'os';
import * as chalk from 'chalk';
import * as dateformat from 'dateformat';
import { program } from '../argv';
import { getRepository } from 'typeorm';
import { Log } from '../models/entities/log';
import { genId } from '../misc/gen-id';
import config from '../config';

const SyslogPro = require('syslog-pro');

type Domain = {
	name: string;
	color?: string;
};

type Level = 'error' | 'success' | 'warning' | 'debug' | 'info';

export default class Logger {
	private domain: Domain;
	private parentLogger: Logger | null = null;
	private store: boolean;
	private syslogClient: any | null = null;

	constructor(domain: string, color?: string, store = true) {
		this.domain = {
			name: domain,
			color: color,
		};
		this.store = store;

		if (config.syslog) {
			this.syslogClient = new SyslogPro.RFC5424({
				applacationName: 'Misskey',
				timestamp: true,
				encludeStructuredData: true,
				color: true,
				extendedColor: true,
				server: {
					target: config.syslog.host,
					port: config.syslog.port,
				}
			});
		}
	}

	public createSubLogger(domain: string, color?: string, store = true): Logger {
		const logger = new Logger(domain, color, store);
		logger.parentLogger = this;
		return logger;
	}

	private log(level: Level, message: string, data?: Record<string, any> | null, important = false, subDomains: Domain[] = [], store = true): void {
		if (program.quiet) return;
		if (!this.store) store = false;
		if (level === 'debug') store = false;

		if (this.parentLogger) {
			this.parentLogger.log(level, message, data, important, [this.domain].concat(subDomains), store);
			return;
		}

		const time = dateformat(new Date(), 'HH:MM:ss');
		const worker = cluster.isMaster ? '*' : cluster.worker.id;
		const l =
			level === 'error' ? important ? chalk.bgRed.white('ERR ') : chalk.red('ERR ') :
			level === 'warning' ? chalk.yellow('WARN') :
			level === 'success' ? important ? chalk.bgGreen.white('DONE') : chalk.green('DONE') :
			level === 'debug' ? chalk.gray('VERB') :
			level === 'info' ? chalk.blue('INFO') :
			null;
		const domains = [this.domain].concat(subDomains).map(d => d.color ? chalk.keyword(d.color)(d.name) : chalk.white(d.name));
		const m =
			level === 'error' ? chalk.red(message) :
			level === 'warning' ? chalk.yellow(message) :
			level === 'success' ? chalk.green(message) :
			level === 'debug' ? chalk.gray(message) :
			level === 'info' ? message :
			null;

		let log = `${l} ${worker}\t[${domains.join(' ')}]\t${m}`;
		if (program.withLogTime) log = chalk.gray(time) + ' ' + log;

		console.log(important ? chalk.bold(log) : log);

		if (store) {
			if (this.syslogClient) {
				const send =
					level === 'error' ? this.syslogClient.error :
					level === 'warning' ? this.syslogClient.warning :
					level === 'success' ? this.syslogClient.info :
					level === 'debug' ? this.syslogClient.info :
					level === 'info' ? this.syslogClient.info :
					null as never;

				send.bind(this.syslogClient)(message);
			} else {
				const Logs = getRepository(Log);
				Logs.insert({
					id: genId(),
					createdAt: new Date(),
					machine: os.hostname(),
					worker: worker.toString(),
					domain: [this.domain].concat(subDomains).map(d => d.name),
					level: level,
					message: message.substr(0, 1000), // 1024を超えるとログが挿入できずエラーになり無限ループする
					data: data,
				} as Log);
			}
		}
	}

	public error(x: string | Error, data?: Record<string, any> | null, important = false): void { // 実行を継続できない状況で使う
		if (x instanceof Error) {
			data = data || {};
			data.e = x;
			this.log('error', x.toString(), data, important);
		} else {
			this.log('error', x, data, important);
		}
	}

	public warn(message: string, data?: Record<string, any> | null, important = false): void { // 実行を継続できるが改善すべき状況で使う
		this.log('warning', message, data, important);
	}

	public succ(message: string, data?: Record<string, any> | null, important = false): void { // 何かに成功した状況で使う
		this.log('success', message, data, important);
	}

	public debug(message: string, data?: Record<string, any> | null, important = false): void { // デバッグ用に使う(開発者に必要だが利用者に不要な情報)
		if (process.env.NODE_ENV != 'production' || program.verbose) {
			this.log('debug', message, data, important);
		}
	}

	public info(message: string, data?: Record<string, any> | null, important = false): void { // それ以外
		this.log('info', message, data, important);
	}
}
