import { Peripheral } from "noble";

import { Hub } from "./hub";
import { Port } from "./port";

import * as Consts from "./consts";

import Debug = require("debug");
const debug = Debug("lpf2hub");


/**
 * @class LPF2Hub
 * @ignore
 * @extends Hub
 */
export class LPF2Hub extends Hub {


    protected _current: number = 0;

    private _lastTiltX: number = 0;
    private _lastTiltY: number = 0;

    private _messageBuffer: Buffer = Buffer.alloc(0);


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


    public connect () {
        return new Promise(async (resolve, reject) => {
            await super.connect();
            const characteristic = this._getCharacteristic(Consts.BLECharacteristics.LPF2_ALL);
            this._subscribeToCharacteristic(characteristic, this._parseMessage.bind(this));
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, Buffer.from([0x01, 0x02, 0x02])); // Activate button reports
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, Buffer.from([0x41, 0x3b, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01])); // Activate current reports
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, Buffer.from([0x41, 0x3c, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01])); // Activate voltage reports
            if (this.type === Consts.Hubs.DUPLO_TRAIN_HUB) {
                this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, Buffer.from([0x41, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x01]));
            }
            return resolve();
        });
    }


    /**
     * Set the name of the Hub.
     * @method LPF2Hub#setName
     * @param {string} name New name of the hub (14 characters or less, ASCII only).
     * @returns {Promise} Resolved upon successful issuance of command.
     */
    public setName (name: string) {
        if (name.length > 14) {
            throw new Error("Name must be 14 characters or less");
        }
        return new Promise((resolve, reject) => {
            let data = Buffer.from([0x01, 0x01, 0x01]);
            data = Buffer.concat([data, Buffer.from(name, "ascii")]);
            // Send this twice, as sometimes the first time doesn't take
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, data);
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, data);
            this._name = name;
            return resolve();
        });
    }


    /**
     * Set the color of the LED on the Hub via a color value.
     * @method LPF2Hub#setLEDColor
     * @param {number} color A number representing one of the LED <a href="#Colors">Colors</a>.
     * @returns {Promise} Resolved upon successful issuance of command.
     */
    public setLEDColor (color: number | boolean) {
        return new Promise((resolve, reject) => {
            let data = Buffer.from([0x41, 0x32, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00]);
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, data);
            if (color === false) {
                color = 0;
            }
            data = Buffer.from([0x81, 0x32, 0x11, 0x51, 0x00, color]);
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, data);
            return resolve();
        });
    }


    /**
     * Set the color of the LED on the Hub via RGB values.
     * @method LPF2Hub#setLEDRGB
     * @param {number} red
     * @param {number} green
     * @param {number} blue
     * @returns {Promise} Resolved upon successful issuance of command.
     */
    public setLEDRGB (red: number, green: number, blue: number) {
        return new Promise((resolve, reject) => {
            let data = Buffer.from([0x41, 0x32, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00]);
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, data);
            data = Buffer.from([0x81, 0x32, 0x11, 0x51, 0x01, red, green, blue]);
            this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, data);
            return resolve();
        });
    }


    protected _activatePortDevice (port: number, type: number, mode: number, format: number, callback?: () => void) {
        this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, Buffer.from([0x41, port, mode, 0x01, 0x00, 0x00, 0x00, 0x01]), callback);
    }


    protected _deactivatePortDevice (port: number, type: number, mode: number, format: number, callback?: () => void) {
        this._writeMessage(Consts.BLECharacteristics.LPF2_ALL, Buffer.from([0x41, port, mode, 0x01, 0x00, 0x00, 0x00, 0x00]), callback);
    }


    protected _writeMessage (uuid: string, message: Buffer, callback?: () => void) {
        const characteristic = this._getCharacteristic(uuid);
        if (characteristic) {
            message = Buffer.concat([Buffer.alloc(2), message]);
            message[0] = message.length;
            characteristic.write(message, false, callback);
        }
    }


    private _parseMessage (data?: Buffer) {

        if (data) {
            this._messageBuffer = Buffer.concat([this._messageBuffer, data]);
        }

        if (this._messageBuffer.length <= 0) {
            return;
        }

        const len = this._messageBuffer[0];
        if (len >= this._messageBuffer.length) {

            const message = this._messageBuffer.slice(0, len);
            this._messageBuffer = this._messageBuffer.slice(len);

            switch (message[2]) {
                case 0x01:
                {
                    this._parseDeviceInfo(message);
                    break;
                }
                case 0x04:
                {
                    this._parsePortMessage(message);
                    break;
                }
                case 0x45:
                {
                    this._parseSensorMessage(message);
                    break;
                }
                case 0x82:
                {
                    this._parsePortAction(message);
                    break;
                }
            }

            if (this._messageBuffer.length > 0) {
                this._parseMessage();
            }

        }
    }


    private _parseDeviceInfo (data: Buffer) {

        if (data[3] === 2) {
            if (data[5] === 1) {
                /**
                 * Emits when a button is pressed.
                 * @event LPF2Hub#button
                 * @param {string} button
                 * @param {number} state A number representing one of the <a href="#ButtonStates">ButtonStates</a>.
                 */
                this.emit("button", "GREEN", Consts.ButtonStates.PRESSED);
                return;
            } else if (data[5] === 0) {
                this.emit("button", "GREEN", Consts.ButtonStates.RELEASED);
                return;
            }
        }

    }


    private _parsePortMessage (data: Buffer) {

        const port = this._getPortForPortNumber(data[3]);

        if (!port) {
            return;
        }

        port.connected = (data[4] === 1 || data[4] === 2) ? true : false;
        this._registerDeviceAttachment(port, data[5]);

    }


    private _parsePortAction (data: Buffer) {

        const port = this._getPortForPortNumber(data[3]);

        if (!port) {
            return;
        }

        if (data[4] === 0x0a) {
            port.busy = false;
            if (port.finished) {
                port.finished();
                port.finished = null;
            }
        }

    }


    private _padMessage (data: Buffer, len: number) {
        if (data.length < len) {
            data = Buffer.concat([data, Buffer.alloc(len - data.length)]);
        }
        return data;
    }


    private _parseSensorMessage (data: Buffer) {

        if ((data[3] === 0x3b && this.type === Consts.Hubs.POWERED_UP_REMOTE) || (data[3] === 0x3c && this.type !== Consts.Hubs.POWERED_UP_REMOTE)) { // Voltage
            data = this._padMessage(data, 6);
            const batteryLevel = (data.readUInt16LE(4) / 4096) * 100;
            this._batteryLevel = Math.floor(batteryLevel);
            return;
        } else if (data[3] === 0x3b && this.type !== Consts.Hubs.POWERED_UP_REMOTE) { // Current (Non-PUP Remote)
            data = this._padMessage(data, 6);
            const current = data.readUInt16LE(4) / 4096;
            this._current = current * 100;
            return;
        } else if (data[3] === 0x3c) { // Current (PUP Remote)
            data = this._padMessage(data, 6);
            const current = data.readUInt16LE(4) / 1000;
            this._current = current;
            return;
        }

        const port = this._getPortForPortNumber(data[3]);

        if (!port) {
            return;
        }

        if (port && port.connected) {
            switch (port.type) {
                case Consts.Devices.WEDO2_DISTANCE:
                {
                    let distance = data[4];
                    if (data[5] === 1) {
                        distance = data[4] + 255;
                    }
                    /**
                     * Emits when a distance sensor is activated.
                     * @event LPF2Hub#distance
                     * @param {string} port
                     * @param {number} distance Distance, in millimeters.
                     */
                    this.emit("distance", port.id, distance * 10);
                    break;
                }
                case Consts.Devices.BOOST_DISTANCE:
                {

                    /**
                     * Emits when a color sensor is activated.
                     * @event LPF2Hub#color
                     * @param {string} port
                     * @param {number} color A number representing one of the LED <a href="#Colors">Colors</a>
                     */
                    if (data[4] <= 10) {
                        this.emit("color", port.id, data[4]);
                    }

                    let distance = data[5];
                    const partial = data[7];

                    if (partial > 0) {
                        distance += 1.0 / partial;
                    }

                    distance = Math.floor(distance * 25.4) - 20;

                    this.emit("distance", port.id, distance);

                    /**
                     * A combined color and distance event, emits when the sensor is activated.
                     * @event LPF2Hub#colorAndDistance
                     * @param {string} port
                     * @param {number} color A number representing one of the LED <a href="#Colors">Colors</a>
                     * @param {number} distance Distance, in millimeters.
                     */
                    if (data[4] <= 10) {
                        this.emit("colorAndDistance", port.id, data[4], distance);
                    }
                    break;
                }
                case Consts.Devices.WEDO2_TILT:
                {
                    const tiltX = data[4] > 160 ? data[4] - 255 : data[4] - (data[4] * 2);
                    const tiltY = data[5] > 160 ? 255 - data[5] : data[5] - (data[5] * 2);
                    this._lastTiltX = tiltX;
                    this._lastTiltY = tiltY;
                    /**
                     * Emits when a tilt sensor is activated.
                     * @event LPF2Hub#tilt
                     * @param {string} port If the event is fired from the Move Hub's in-built tilt sensor, the special port "TILT" is used.
                     * @param {number} x
                     * @param {number} y
                     */
                    this.emit("tilt", port.id, this._lastTiltX, this._lastTiltY);
                    break;
                }
                case Consts.Devices.BOOST_TACHO_MOTOR:
                {
                    const rotation = data.readInt32LE(4);
                    /**
                     * Emits when a rotation sensor is activated.
                     * @event LPF2Hub#rotate
                     * @param {string} port
                     * @param {number} rotation
                     */
                    this.emit("rotate", port.id, rotation);
                    break;
                }
                case Consts.Devices.BOOST_MOVE_HUB_MOTOR:
                {
                    const rotation = data.readInt32LE(4);
                    this.emit("rotate", port.id, rotation);
                    break;
                }
                case Consts.Devices.BOOST_TILT:
                {
                    const tiltX = data[4] > 160 ? data[4] - 255 : data[4];
                    const tiltY = data[5] > 160 ? 255 - data[5] : data[5] - (data[5] * 2);
                    this.emit("tilt", port.id, tiltX, tiltY);
                    break;
                }
                case Consts.Devices.POWERED_UP_REMOTE_BUTTON:
                {
                    switch (data[4]) {
                        case 0x01:
                        {
                            this.emit("button", port.id, Consts.ButtonStates.UP);
                            break;
                        }
                        case 0xff:
                        {
                            this.emit("button", port.id, Consts.ButtonStates.DOWN);
                            break;
                        }
                        case 0x7f:
                        {
                            this.emit("button", port.id, Consts.ButtonStates.STOP);
                            break;
                        }
                        case 0x00:
                        {
                            this.emit("button", port.id, Consts.ButtonStates.RELEASED);
                            break;
                        }
                    }
                    break;
                }
                case Consts.Devices.DUPLO_TRAIN_BASE_COLOR:
                {
                    if (data[4] <= 10) {
                        this.emit("color", port.id, data[4]);
                    }
                    break;
                }
                case Consts.Devices.DUPLO_TRAIN_BASE_SPEEDOMETER:
                {
                    /**
                     * Emits on a speed change.
                     * @event LPF2Hub#speed
                     * @param {string} port
                     * @param {number} speed
                     */
                    const speed = data.readInt16LE(4);
                    this.emit("speed", port.id, speed);
                    break;
                }
            }
        }

    }


}