/*!
 * 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 { ButtplugLogger } from "../core/Logging";
import { EventEmitter } from "eventemitter3";
import { ButtplugClientDevice } from "./ButtplugClientDevice";
import { IButtplugClientConnector } from "./IButtplugClientConnector";
import { ButtplugMessageSorter } from "../utils/ButtplugMessageSorter";

import * as Messages from "../core/Messages";
import {
	ButtplugDeviceError,
	ButtplugError,
	ButtplugInitError,
	ButtplugMessageError,
} from "../core/Exceptions";
import { ButtplugClientConnectorException } from "./ButtplugClientConnectorException";
import { getMessageClassFromMessage } from "../core/MessageUtils";

export class ButtplugClient extends EventEmitter {
	protected _pingTimer: NodeJS.Timeout | null = null;
	protected _connector: IButtplugClientConnector | null = null;
	protected _devices: Map<number, ButtplugClientDevice> = new Map();
	protected _clientName: string;
	protected _logger = ButtplugLogger.Logger;
	protected _isScanning = false;
	private _sorter: ButtplugMessageSorter = new ButtplugMessageSorter(true);

	constructor(clientName = "Generic Buttplug Client") {
		super();
		this._clientName = clientName;
		this._logger.Debug(`ButtplugClient: Client ${clientName} created.`);
	}

	public get connected(): boolean {
		return this._connector !== null && this._connector.Connected;
	}

	public get devices(): ButtplugClientDevice[] {
		// While this function doesn't actually send a message, if we don't have a
		// connector, we shouldn't have devices.
		this.checkConnector();
		const devices: ButtplugClientDevice[] = [];
		this._devices.forEach((d) => {
			devices.push(d);
		});
		return devices;
	}

	public get isScanning(): boolean {
		return this._isScanning;
	}

	public connect = async (connector: IButtplugClientConnector) => {
		this._logger.Info(
			`ButtplugClient: Connecting using ${connector.constructor.name}`,
		);
		await connector.connect();
		this._connector = connector;
		this._connector.addListener("message", this.parseMessages);
		this._connector.addListener("disconnect", this.disconnectHandler);
		await this.initializeConnection();
	};

	public disconnect = async () => {
		this._logger.Debug("ButtplugClient: Disconnect called");
		this.checkConnector();
		await this.shutdownConnection();
		await this._connector!.disconnect();
	};

	public startScanning = async () => {
		this._logger.Debug("ButtplugClient: StartScanning called");
		this._isScanning = true;
		await this.sendMsgExpectOk(new Messages.StartScanning());
	};

	public stopScanning = async () => {
		this._logger.Debug("ButtplugClient: StopScanning called");
		this._isScanning = false;
		await this.sendMsgExpectOk(new Messages.StopScanning());
	};

	public stopAllDevices = async () => {
		this._logger.Debug("ButtplugClient: StopAllDevices");
		await this.sendMsgExpectOk(new Messages.StopAllDevices());
	};

	private async sendDeviceMessage(
		device: ButtplugClientDevice,
		deviceMsg: Messages.ButtplugDeviceMessage,
	): Promise<Messages.ButtplugMessage> {
		this.checkConnector();
		const dev = this._devices.get(device.index);
		if (dev === undefined) {
			throw ButtplugError.LogAndError(
				ButtplugDeviceError,
				this._logger,
				`Device ${device.index} not available.`,
			);
		}
		deviceMsg.DeviceIndex = device.index;
		return await this.sendMessage(deviceMsg);
	}

	protected disconnectHandler = () => {
		this._logger.Info("ButtplugClient: Disconnect event receieved.");
		this.emit("disconnect");
	};

	protected parseMessages = (msgs: Messages.ButtplugMessage[]) => {
		const leftoverMsgs = this._sorter.ParseIncomingMessages(msgs);
		for (const x of leftoverMsgs) {
			switch (getMessageClassFromMessage(x)) {
				case Messages.DeviceAdded: {
					const addedMsg = x as Messages.DeviceAdded;
					const addedDevice = ButtplugClientDevice.fromMsg(
						addedMsg,
						this.sendDeviceMessageClosure,
					);
					this._devices.set(addedMsg.DeviceIndex, addedDevice);
					this.emit("deviceadded", addedMsg, addedDevice);
					break;
				}
				case Messages.DeviceRemoved: {
					const removedMsg = x as Messages.DeviceRemoved;
					if (this._devices.has(removedMsg.DeviceIndex)) {
						const removedDevice = this._devices.get(removedMsg.DeviceIndex);
						removedDevice?.emitDisconnected();
						this._devices.delete(removedMsg.DeviceIndex);
						this.emit("deviceremoved", removedMsg, removedDevice);
					}
					break;
				}
				case Messages.ScanningFinished:
					this._isScanning = false;
					this.emit("scanningfinished", x);
					break;
			}
		}
	};

	protected initializeConnection = async (): Promise<boolean> => {
		this.checkConnector();
		const msg = await this.sendMessage(
			new Messages.RequestServerInfo(
				this._clientName,
				Messages.MESSAGE_SPEC_VERSION,
			),
		);
		switch (getMessageClassFromMessage(msg)) {
			case Messages.ServerInfo: {
				const serverinfo = msg as Messages.ServerInfo;
				this._logger.Info(
					`ButtplugClient: Connected to Server ${serverinfo.ServerName}`,
				);
				// TODO: maybe store server name, do something with message template version?
				const ping = serverinfo.MaxPingTime;
				if (serverinfo.MessageVersion < Messages.MESSAGE_SPEC_VERSION) {
					// Disconnect and throw an exception explaining the version mismatch problem.
					await this._connector!.disconnect();
					throw ButtplugError.LogAndError(
						ButtplugInitError,
						this._logger,
						`Server protocol version ${serverinfo.MessageVersion} is older than client protocol version ${Messages.MESSAGE_SPEC_VERSION}. Please update server.`,
					);
				}
				if (ping > 0) {
					/*
          this._pingTimer = setInterval(async () => {
            // If we've disconnected, stop trying to ping the server.
            if (!this.Connected) {
              await this.ShutdownConnection();
              return;
            }
            await this.SendMessage(new Messages.Ping());
          } , Math.round(ping / 2));
          */
				}
				await this.requestDeviceList();
				return true;
			}
			case Messages.Error: {
				// Disconnect and throw an exception with the error message we got back.
				// This will usually only error out if we have a version mismatch that the
				// server has detected.
				await this._connector!.disconnect();
				const err = msg as Messages.Error;
				throw ButtplugError.LogAndError(
					ButtplugInitError,
					this._logger,
					`Cannot connect to server. ${err.ErrorMessage}`,
				);
			}
		}
		return false;
	};

	protected requestDeviceList = async () => {
		this.checkConnector();
		this._logger.Debug("ButtplugClient: ReceiveDeviceList called");
		const deviceList = (await this.sendMessage(
			new Messages.RequestDeviceList(),
		)) as Messages.DeviceList;
		deviceList.Devices.forEach((d) => {
			if (!this._devices.has(d.DeviceIndex)) {
				const device = ButtplugClientDevice.fromMsg(
					d,
					this.sendDeviceMessageClosure,
				);
				this._logger.Debug(`ButtplugClient: Adding Device: ${device}`);
				this._devices.set(d.DeviceIndex, device);
				this.emit("deviceadded", device);
			} else {
				this._logger.Debug(`ButtplugClient: Device already added: ${d}`);
			}
		});
	};

	protected shutdownConnection = async () => {
		await this.stopAllDevices();
		if (this._pingTimer !== null) {
			clearInterval(this._pingTimer);
			this._pingTimer = null;
		}
	};

	protected async sendMessage(
		msg: Messages.ButtplugMessage,
	): Promise<Messages.ButtplugMessage> {
		this.checkConnector();
		const p = this._sorter.PrepareOutgoingMessage(msg);
		await this._connector!.send(msg);
		return await p;
	}

	protected checkConnector() {
		if (!this.connected) {
			throw new ButtplugClientConnectorException(
				"ButtplugClient not connected",
			);
		}
	}

	protected sendMsgExpectOk = async (
		msg: Messages.ButtplugMessage,
	): Promise<void> => {
		const response = await this.sendMessage(msg);
		switch (getMessageClassFromMessage(response)) {
			case Messages.Ok:
				return;
			case Messages.Error:
				throw ButtplugError.FromError(response as Messages.Error);
			default:
				throw ButtplugError.LogAndError(
					ButtplugMessageError,
					this._logger,
					`Message type ${getMessageClassFromMessage(response)!.constructor} not handled by SendMsgExpectOk`,
				);
		}
	};

	protected sendDeviceMessageClosure = async (
		device: ButtplugClientDevice,
		msg: Messages.ButtplugDeviceMessage,
	): Promise<Messages.ButtplugMessage> => {
		return await this.sendDeviceMessage(device, msg);
	};
}