const { EventEmitter } = require('events'); 
const { inspect } = require('util');

const ShardManager = require('./middleware/ShardManager.js');
const Logger = require('./middleware/logger/Logger.js');

class Manager extends EventEmitter {

    constructor(options) {

        super();

        this.shardManager = new ShardManager('./structure/client/DiscordClient.js', options);
        this.logger = new Logger(this);

        this._built = false;
        this.readyAt = null;

        this.shardManager.on('message', this._handleMessage.bind(this));
        // this.on('built', () => {
        //     this.shardManager.broadcast({ _built: true });
        // });
        
    }

    _handleMessage(shard, message) {

        if (message._mEval) return this.eval(shard, message);
        if (message._logger) return this.logger._handleMessage(shard, message);
        if (message._webhook) return undefined; //todo
    }

    async build() {

        await this.shardManager.spawn();

        this._built = true;
        this.emit('built');
        this.readyAt = Date.now();

    }

    /**
     *
     *
     * @param {*} shard The shard from which the eval came and to which it will be returned
     * @param {*} script The script to be executed
     * @memberof Manager
     * @private
     */
    async eval(shard, { script }) {

        this.logger.write('info', `Incoming manager eval from shard ${shard.id}:\n${script}`);
        let result = null,
            error = null;
        
        try {
            // eslint-disable-next-line no-eval
            result = eval(script);
            if (result instanceof Promise) result = await result;
            //if(typeof result !== 'string') result = inspect(result);
        } catch (err) {
            error = err.stack || err;
        }

        return shard.send({
            _evalResult: true,
            script,
            result,
            error
        });

    }

    get uptime() {
        return this.readyAt !== null ? Date.now() - this.readyAt : 0;
    }

}

module.exports = Manager;