import { EventEmitter } from "events";

import { IBLEAbstraction } from "../interfaces";

import { ColorDistanceSensor } from "../devices/colordistancesensor";
import { Device } from "../devices/device";
import { Light } from "../devices/light";
import { MediumLinearMotor } from "../devices/mediumlinearmotor";
import { MotionSensor } from "../devices/motionsensor";
import { MoveHubMediumLinearMotor } from "../devices/movehubmediumlinearmotor";
import { SimpleMediumLinearMotor } from "../devices/simplemediumlinearmotor";
import { TechnicLargeLinearMotor } from "../devices/techniclargelinearmotor";
import { TechnicXLargeLinearMotor } from "../devices/technicxlargelinearmotor";
import { TiltSensor } from "../devices/tiltsensor";
import { TrainMotor } from "../devices/trainmotor";

import * as Consts from "../consts";

import Debug = require("debug");
const debug = Debug("hub");


/**
 * @class Hub
 * @extends EventEmitter
 */
export class Hub extends EventEmitter {

    protected _attachedDevices: {[portId: number]: Device} = {};
    // protected _virtualPorts: {[port: string]: Port} = {};

    protected _name: string = "";
    protected _firmwareVersion: string = "0.0.00.0000";
    protected _hardwareVersion: string = "0.0.00.0000";
    protected _primaryMACAddress: string = "00:00:00:00:00:00";
    protected _batteryLevel: number = 100;
    protected _voltage: number = 0;
    protected _current: number = 0;
    protected _rssi: number = -60;

    protected _bleDevice: IBLEAbstraction;

    private _type: Consts.HubType;
    private _portMap: {[port: string]: number} = {};

    constructor (device: IBLEAbstraction, portMap: {[port: string]: number} = {}, type: Consts.HubType = Consts.HubType.UNKNOWN) {
        super();
        this._type = type;
        this._bleDevice = device;
        this._portMap = portMap;
        device.on("disconnect", () => {
            /**
             * Emits when the hub is disconnected.
             * @event Hub#disconnect
             */
            this.emit("disconnect");
        });
    }


    /**
     * @readonly
     * @property {string} name Name of the hub
     */
    public get name () {
        return this._bleDevice.name;
    }


    /**
     * @readonly
     * @property {string} type Hub type
     */
    public get type () {
        return this._type;
    }


    /**
     * @readonly
     * @property {string[]} ports Array of port names
     */
    public get ports () {
        return Object.keys(this._portMap);
    }


    /**
     * @readonly
     * @property {string} firmwareVersion Firmware version of the hub
     */
    public get firmwareVersion () {
        return this._firmwareVersion;
    }


    /**
     * @readonly
     * @property {string} firmwareVersion Hardware version of the hub
     */
    public get hardwareVersion () {
        return this._hardwareVersion;
    }


    /**
     * @readonly
     * @property {string} primaryMACAddress Primary MAC address of the hub
     */
    public get primaryMACAddress () {
        return this._primaryMACAddress;
    }


    /**
     * @readonly
     * @property {string} uuid UUID of the hub
     */
    public get uuid () {
        return this._bleDevice.uuid;
    }


    /**
     * @readonly
     * @property {number} batteryLevel Battery level of the hub (Percentage between 0-100)
     */
    public get batteryLevel () {
        return this._batteryLevel;
    }


    /**
     * @readonly
     * @property {number} rssi Signal strength of the hub
     */
    public get rssi () {
        return this._rssi;
    }


    /**
     * @readonly
     * @property {number} voltage Voltage of the hub (Volts)
     */
    public get voltage () {
        return this._voltage;
    }


    /**
     * @readonly
     * @property {number} current Current usage of the hub (Milliamps)
     */
    public get current () {
        return this._current;
    }


    /**
     * Connect to the Hub.
     * @method Hub#connect
     * @returns {Promise} Resolved upon successful connect.
     */
    public connect () {
        return new Promise(async (connectResolve, connectReject) => {
            if (this._bleDevice.connecting) {
                return connectReject("Already connecting");
            } else if (this._bleDevice.connected) {
                return connectReject("Already connected");
            }
            await this._bleDevice.connect();
            return connectResolve();
        });

    }


    /**
     * Disconnect the Hub.
     * @method Hub#disconnect
     * @returns {Promise} Resolved upon successful disconnect.
     */
    public disconnect () {
        return this._bleDevice.disconnect();
    }


    public getDeviceAtPort (portName: string) {
        const portId = this._portMap[portName];
        if (portId) {
            return this._attachedDevices[portId];
        } else {
            throw new Error(`Port ${portName} does not exist on this hub type`);
        }
    }


    public getDevices () {
        return Object.values(this._attachedDevices);
    }


    public getDevicesByType (deviceType: number) {
        return this.getDevices().filter((device) => device.type === deviceType);
    }


    public getPortNameForPortId (portId: number) {
        for (const port of Object.keys(this._portMap)) {
            if (this._portMap[port] === portId) {
                return port;
            }
        }
        return;
    }


    /**
     * Sleep a given amount of time.
     *
     * This is a helper method to make it easier to add delays into a chain of commands.
     * @method Hub#sleep
     * @param {number} delay How long to sleep (in milliseconds).
     * @returns {Promise} Resolved after the delay is finished.
     */
    public sleep (delay: number) {
        return new Promise((resolve) => {
            global.setTimeout(resolve, delay);
        });
    }


    /**
     * Wait until a given list of concurrently running commands are complete.
     *
     * This is a helper method to make it easier to wait for concurrent commands to complete.
     * @method Hub#wait
     * @param {Array<Promise<any>>} commands Array of executing commands.
     * @returns {Promise} Resolved after the commands are finished.
     */
    public wait (commands: Array<Promise<any>>) {
        return Promise.all(commands);
    }


    public send (message: Buffer, uuid: string, callback?: () => void) {
        if (callback) {
            callback();
        }
    }


    public subscribe (portId: number, deviceType: number, mode: number) {
        // NK Do nothing here
    }


    protected _attachDevice (device: Device) {
        this._attachedDevices[device.portId] = device;
        /**
         * Emits when a device is attached to the Hub.
         * @event Hub#attach
         * @param {Device} device
         */
        this.emit("attach", device);
    }


    protected _detachDevice (device: Device) {
        delete this._attachedDevices[device.portId];
        /**
         * Emits when a device is detached from the Hub.
         * @event Hub#attach
         * @param {Device} device
         */
        this.emit("detach", device);
    }


    protected _createDevice (deviceType: number, portId: number) {
        let device;

        switch (deviceType) {
            case Consts.DeviceType.LIGHT:
                device = new Light(this, portId);
                break;
            case Consts.DeviceType.TRAIN_MOTOR:
                device = new TrainMotor(this, portId);
                break;
            case Consts.DeviceType.SIMPLE_MEDIUM_LINEAR_MOTOR:
                device = new SimpleMediumLinearMotor(this, portId);
                break;
            case Consts.DeviceType.MOVE_HUB_MEDIUM_LINEAR_MOTOR:
                device = new MoveHubMediumLinearMotor(this, portId);
                break;
            case Consts.DeviceType.MOTION_SENSOR:
                device = new MotionSensor(this, portId);
                break;
            case Consts.DeviceType.TILT_SENSOR:
                device = new TiltSensor(this, portId);
                break;
            case Consts.DeviceType.MEDIUM_LINEAR_MOTOR:
                device = new MediumLinearMotor(this, portId);
                break;
            case Consts.DeviceType.TECHNIC_LARGE_LINEAR_MOTOR:
                device = new TechnicLargeLinearMotor(this, portId);
                break;
            case Consts.DeviceType.TECHNIC_XLARGE_LINEAR_MOTOR:
                device = new TechnicXLargeLinearMotor(this, portId);
                break;
            case Consts.DeviceType.COLOR_DISTANCE_SENSOR:
                device = new ColorDistanceSensor(this, portId);
                break;
            default:
                device = new Device(this, portId, undefined, deviceType);
                break;
        }

        return device;
    }


    protected _getDeviceByPortId (portId: number) {
        return this._attachedDevices[portId];
    }


}