/*!
 * Buttplug JS Source Code File - Visit https://buttplug.io for more info about
 * the project. Licensed under the BSD 3-Clause license. See LICENSE file in the
 * project root for full license information.
 *
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

"use strict";
import * as Messages from "../core/Messages";
import { ButtplugDeviceError, ButtplugError, ButtplugMessageError } from "../core/Exceptions";
import { EventEmitter } from "eventemitter3";
import { ButtplugClientDeviceFeature } from "./ButtplugClientDeviceFeature";
import { DeviceOutputCommand } from "./ButtplugClientDeviceCommand";

/**
 * Represents an abstract device, capable of taking certain kinds of messages.
 */
export class ButtplugClientDevice extends EventEmitter {
  private _features: Map<number, ButtplugClientDeviceFeature>;

  /**
   * Return the name of the device.
   */
  public get name(): string {
    return this._deviceInfo.DeviceName;
  }

  /**
   * Return the user set name of the device.
   */
  public get displayName(): string | undefined {
    return this._deviceInfo.DeviceDisplayName;
  }

  /**
   * Return the index of the device.
   */
  public get index(): number {
    return this._deviceInfo.DeviceIndex;
  }

  /**
   * Return the index of the device.
   */
  public get messageTimingGap(): number | undefined {
    return this._deviceInfo.DeviceMessageTimingGap;
  }

  public get features(): Map<number, ButtplugClientDeviceFeature> {
    return this._features;
  }

  public static fromMsg(
    msg: Messages.DeviceInfo,
    sendClosure: (msg: Messages.ButtplugMessage) => Promise<Messages.ButtplugMessage>,
  ): ButtplugClientDevice {
    return new ButtplugClientDevice(msg, sendClosure);
  }

  /**
   * @param _index Index of the device, as created by the device manager.
   * @param _name Name of the device.
   * @param allowedMsgs Buttplug messages the device can receive.
   */
  private constructor(
    private _deviceInfo: Messages.DeviceInfo,
    private _sendClosure: (msg: Messages.ButtplugMessage) => Promise<Messages.ButtplugMessage>,
  ) {
    super();
    this._features = new Map(
      Object.entries(_deviceInfo.DeviceFeatures).map(([index, v]) => [
        parseInt(index),
        new ButtplugClientDeviceFeature(
          _deviceInfo.DeviceIndex,
          _deviceInfo.DeviceName,
          v,
          _sendClosure,
        ),
      ]),
    );
  }

  public async send(msg: Messages.ButtplugMessage): Promise<Messages.ButtplugMessage> {
    // Assume we're getting the closure from ButtplugClient, which does all of
    // the index/existence/connection/message checks for us.
    return await this._sendClosure(msg);
  }

  protected sendMsgExpectOk = async (msg: Messages.ButtplugMessage): Promise<void> => {
    const response = await this.send(msg);
    if (response.Ok !== undefined) {
      return;
    } else if (response.Error !== undefined) {
      throw ButtplugError.FromError(response as Messages.Error);
    } else {
      /*
      throw ButtplugError.LogAndError(
        ButtplugMessageError,
        this._logger,
        `Message ${response} not handled by SendMsgExpectOk`
      );
      */
    }
  };

  protected isOutputValid(featureIndex: number, type: Messages.OutputType) {
    if (!this._deviceInfo.DeviceFeatures.hasOwnProperty(featureIndex.toString())) {
      throw new ButtplugDeviceError(
        `Feature index ${featureIndex} does not exist for device ${this.name}`,
      );
    }
    if (
      this._deviceInfo.DeviceFeatures[featureIndex.toString()].Outputs !== undefined &&
      !this._deviceInfo.DeviceFeatures[featureIndex.toString()].Outputs.hasOwnProperty(type)
    ) {
      throw new ButtplugDeviceError(
        `Feature index ${featureIndex} does not support type ${type} for device ${this.name}`,
      );
    }
  }

  public hasOutput(type: Messages.OutputType): boolean {
    return (
      this._features
        .values()
        .filter((f) => f.hasOutput(type))
        .toArray().length > 0
    );
  }

  public hasInput(type: Messages.InputType): boolean {
    return (
      this._features
        .values()
        .filter((f) => f.hasInput(type))
        .toArray().length > 0
    );
  }

  public async runOutput(cmd: DeviceOutputCommand): Promise<void> {
    let p: Promise<void>[] = [];
    for (let f of this._features.values()) {
      if (f.hasOutput(cmd.outputType)) {
        p.push(f.runOutput(cmd));
      }
    }
    if (p.length == 0) {
      return Promise.reject(`No features with output type ${cmd.outputType}`);
    }
    await Promise.all(p);
  }

  public async stop(): Promise<void> {
    await this.sendMsgExpectOk({
      StopCmd: {
        Id: 1,
        DeviceIndex: this.index,
        FeatureIndex: undefined,
        Inputs: true,
        Outputs: true,
      },
    });
  }

  public async battery(): Promise<number> {
    let p: Promise<void>[] = [];
    for (let f of this._features.values()) {
      if (f.hasInput(Messages.InputType.Battery)) {
        // Right now, we only have one battery per device, so assume the first one we find is it.
        let response = await f.runInput(Messages.InputType.Battery, Messages.InputCommandType.Read);
        if (response === undefined) {
          throw new ButtplugMessageError("Got incorrect message back.");
        }
        if (response.Reading[Messages.InputType.Battery] === undefined) {
          throw new ButtplugMessageError("Got reading with no Battery info.");
        }
        return response.Reading[Messages.InputType.Battery].Value;
      }
    }
    throw new ButtplugDeviceError(`No battery present on this device.`);
  }

  public emitDisconnected() {
    this.emit("deviceremoved");
  }
}