const { createLogger, format, transports, config } = require('winston');
const { combine, label, printf } = format;
const moment = require('moment');
const chalk = require('chalk');

const { DiscordWebhook, FileExtension } = require('./transports/');

class Logger {

    constructor(manager) {
        
        this.manager = manager;
        this.shardManager = manager.shardManager;

        this.logger = createLogger({
            levels: config.npm.levels,
            format: (
                format.cli({
                    colors: {
                        error: 'red',
                        warn: 'yellow',
                        info: 'blue',
                        verbose: 'cyan',
                        debug: 'magenta',
                        silly: 'magentaBright'
                    }
                })
            ),
            transports: [
                new FileExtension({ filename: `logs/what.log`, level: 'debug'}), //Will NOT log "silly" logs, could change in future.
                new FileExtension({ filename: `logs/error.log` , level: 'error' }),
                new transports.Console({ level: 'silly' }), //Will log EVERYTHING.
                new DiscordWebhook({ level: 'error' }) //Broadcast errors to a discord webhook.
            ]
        });

        //TODO: Add proper date-oriented filenames and add a daily rotation file (?).

        this.shardManager
            .on('shardCreate', (shard) => this.write(shard, "Shard created.", 'debug'))
            .on('message', (shard, message) => this._handleMessage(shard, message));

    }

    //Messages coming from the shards process.send functions.
    async _handleMessage(shard, message) {
        if(message._ready
            || message._disconnect
            || message._reconnecting
            || message._sFetchProp
            || message._sEval
            || message._sRespawnAll
            || message._storage
            || message._webhook) return undefined; //Properties used for discord.js internal sharding & our own structures. must filter for.

        await this.write(shard, message.message, message.type);

    }

    async write(shard, string = '', type = 'silly') {

        const color = Constants.Colors[type];
        const header = `${chalk[color](`[${this.date}][${shard ? `shard${this._shardId(shard)}` : 'manager'}]`)}`;


        this.logger.log(type, `${header} : ${string}`);

    }

    _shardId(shard) {
        const id = shard.id;
        return `${id}`.length === 1 ? `0${id}` : `${id}`;
    }

    get date() {
        return moment().format("MM-DD-YYYY hh:mm:ss");
    }

}

module.exports = Logger;

const Constants = {
    Colors: {
        error: 'red',
        warn: 'yellow',
        info: 'blue',
        verbose: 'cyan',
        debug: 'magenta',
        silly: 'magentaBright'
    }
};

// const levels = { 
//     error: 0,
//     warn: 1,
//     info: 2,
//     http: 3,
//     verbose: 4,
//     debug: 5,
//     silly: 6
//   };