const Message = require('../shared/Message')
const WebSocket = require('ws')
const Errors = require('../shared/Errors')
const config = require('./config')

class Connector {
    initialize() {
        this.client = new WebSocket(`ws://${config.config.data_server}`)
        this.messages = []
        this.token;

        this.client.on('message', msg => this.on_message(msg))
    }

    async on_message(msg) {
        const message = new Message(msg)
        const response = new Message()

        message.socket = this

        if ( message.is_response() ) {
            // Try to find the message that sent the request
            const request = this.messages.find(x => x.uuid() === message.response_to())
            if ( request ) {
                await request._response_callback(message)
                request.has_response = true;
            } else {
                this.send(
                    response.response_to(request.uuid())
                        .error(Errors.InvalidReplyUUID)
                )
            }

            this.messages = this.messages.filter(x => !x.has_response)
        } else {
            let handler;
            try {
                handler = require(`./routes/${message.route()}`)
            } catch (e) {}

            if ( !handler ) {
                return this.send(response.error(Errors.InvalidMessageRoute))
            }

            await handler(message, this)
        }
    }

    async open() {
        await new Promise(res => this.client.once('open', res))
    }

    close() {
        this.client.close()
    }

    send(message) {
        if ( typeof message === 'string' ) {
            this.client.send(message);
            return;
        }

        if ( message.needs_response ) {
            this.messages.push(message);
        }

        const serial = message.serialize()
        this.client.send(serial);
    }

    async simple_request(route, data) {
        return new Promise((res, rej) => {
            this.send(
                Message.route(route)
                    .data(data)
                    .expect_response(message => {
                        if ( message.error() ) rej(new Error(message.error()))
                        else res(message.data())
                    })
            )
        })
    }

    async authenticate(token_value) {
        return new Promise((res, rej) => {
            this.send(
                Message.route('meta.authenticate')
                    .data({ token_value })
                    .expect_response(message => {
                        const { is_auth } = message.data()
                        if ( is_auth ) res()
                        else rej(new Error('Unable to authenticate.'))
                    })
            )
        })
    }
}

module.exports = exports = new Connector;