import { ConnectSocket, ConnectSocketOptions, SocketTask, SendSocketMessageOptions, CloseSocketOptions, OnSocketOpenCallbackResult, GeneralCallbackResult, OnSocketMessageCallbackResult, OnSocketOpenCallback, OnSocketMessageCallback, OnSocketCloseCallback, OnSocketErrorCallback, OnSocketCloseCallbackResult, OnSocketErrorCallbackResult, ConnectSocketSuccess } from "../../interface";
import { WebsockerClient } from "./WebsockerClient"
import { SendSocketMessageFailImpl } from "../../unierror.uts";
class SimpleSocketTask implements SocketTask {

	private client : WebsockerClient | null = null;

	private openCallbacks : Array<(result : OnSocketOpenCallbackResult) => void> = [];
	private closeCallbacks : Array<(result : any) => void> = [];
	private errorCallbacks : Array<(result : GeneralCallbackResult) => void> = [];
	private messageCallbacks : Array<(result : OnSocketMessageCallbackResult) => void> = [];
	constructor(client : WebsockerClient) {
		this.client = client;
	}

	public dispatchOpen(options : OnSocketOpenCallbackResult) {
		for (let i = 0; i < this.openCallbacks.length; i++) {
			const callback = this.openCallbacks[i];
			callback(options);
		}
	}

	public dispatchClose(options : any) {
		for (let i = 0; i < this.closeCallbacks.length; i++) {
			const callback = this.closeCallbacks[i];
			callback(options);
		}
	}

	public dispatchError(options : GeneralCallbackResult) {
		for (let i = 0; i < this.errorCallbacks.length; i++) {
			const callback = this.errorCallbacks[i];
			callback(options);
		}
	}

	public dispatchMessage(options : OnSocketMessageCallbackResult) {
		for (let i = 0; i < this.messageCallbacks.length; i++) {
			const callback = this.messageCallbacks[i];
			callback(options);
		}
	}
	/**
	 * 通过 WebSocket 连接发送数据
	 */
	send(options : SendSocketMessageOptions) : void {
		if (this.client == null) {
			const fail = options.fail;
			const complete = options.complete;
			let result = new SendSocketMessageFailImpl(10002);
			fail?.(result);
			complete?.(result);
			return
		}
		this.client?.send(options)
	}
	/**
	 * 关闭 WebSocket 连接
	 */
	close(options : CloseSocketOptions) : void {
		if (this.client == null) {
			const fail = options.fail;
			const complete = options.complete;
			let result : GeneralCallbackResult = {
				errMsg: "closeSocket:fail WebSocket is not connected"
			}
			fail?.(result);
			complete?.(result);
			return
		}
		this.client?.close(options)
	}
	/**
	 * 监听 WebSocket 连接打开事件
	 */
	onOpen(callback : (result : OnSocketOpenCallbackResult) => void) : void {
		this.openCallbacks.push(callback);
	}
	/**
	 * 监听 WebSocket 连接关闭事件
	 */
	onClose(callback : (result : any) => void) : void {
		this.closeCallbacks.push(callback);
	}
	/**
	 * 监听 WebSocket 错误
	 */
	onError(callback : (result : GeneralCallbackResult) => void) : void {
		this.errorCallbacks.push(callback);
	}
	/**
	 * 监听WebSocket接受到服务器的消息事件
	 */
	onMessage(callback : (result : OnSocketMessageCallbackResult) => void) : void {
		this.messageCallbacks.push(callback);
	}
}

export interface WebSocketManagerListener {
	onOpen(client : WebsockerClient, header : any) : void;

	onMessage(client : WebsockerClient, data : string) : void;

	onClose(client : WebsockerClient, code : number, reason : string) : void;

	onError(client : WebsockerClient, msg : string) : void;
}

export class WebSocketManager implements WebSocketManagerListener {
	private static instance : WebSocketManager | null = null;

	// 数组存储sockettask , 当uni.开头调用的时候,只作用于0元素.  这个task数组,当error或者close的时候 ,会删除.
	private socketTasks : SocketTask[] = [];

	/**
	 * client与task的绑定关系, 用于通过client查找task.
	 */
	private taskMap : Map<WebsockerClient, SocketTask> = new Map<WebsockerClient, SocketTask>();

	private openCallback : OnSocketOpenCallback | null = null;

	private messageCallback : OnSocketMessageCallback | null = null;

	private closeCallback : OnSocketCloseCallback | null = null;

	private errorCallback : OnSocketErrorCallback | null = null;


	public static getInstance() : WebSocketManager {
		if (this.instance == null) {
			this.instance = new WebSocketManager();
		}
		return this.instance!;
	}


	public connectSocket(options : ConnectSocketOptions) : SocketTask {
		const webscoketClient = new WebsockerClient(options, this);
		let task = new SimpleSocketTask(webscoketClient);
		this.taskMap.set(webscoketClient, task);
		this.socketTasks.push(task);
		const success = options.success;
		const complete = options.complete;
		let result : ConnectSocketSuccess = {
			errMsg: "connectSocket:ok"
		}
		success?.(result)
		complete?.(result)
		webscoketClient.connect();
		return task;
	}

	public sendSocketMessage(options : SendSocketMessageOptions) : void {
		if (this.socketTasks.length > 0) {
			const task = this.socketTasks[0];
			task.send(options);
		} else {
			const fail = options.fail;
			const complete = options.complete;
			let result = new SendSocketMessageFailImpl(10002);
			fail?.(result);
			complete?.(result);
		}
	}

	public closeSocket(options : CloseSocketOptions) : void {
		if (this.socketTasks.length > 0) {
			const task = this.socketTasks[0];
			task.close(options);
		} else {
			const fail = options.fail;
			const complete = options.complete;
			let result : GeneralCallbackResult = {
				errMsg: "closeSocket:fail WebSocket is not connected"
			}
			fail?.(result);
			complete?.(result);
		}
	}


	public onSocketOpen(callback : OnSocketOpenCallback) : void {
		this.openCallback = callback;
	}

	public onSocketError(callback : OnSocketErrorCallback) : void {
		this.errorCallback = callback;
	}

	public onSocketClose(callback : OnSocketCloseCallback) : void {
		this.closeCallback = callback;
	}

	public onSocketMessage(callback : OnSocketMessageCallback) : void {
		this.messageCallback = callback;
	}

	getTaskWithClient(client : WebsockerClient) : SocketTask | null {
		return this.taskMap.get(client);
	}


	onOpen(client : WebsockerClient, header : any) : void {
		const task = this.getTaskWithClient(client);
		if (task == null) {
			return
		}
		let result : OnSocketOpenCallbackResult = {
			header: header
		}

		const openCallback = this.openCallback;
		if (this.socketTasks.length > 0 && task === this.socketTasks[0] && openCallback != null) {
			openCallback(result);
		}

		const simpleTask = task as SimpleSocketTask;
		simpleTask.dispatchOpen(result);
	}

	onMessage(client : WebsockerClient, data : string) : void {
		const task = this.getTaskWithClient(client);
		if (task == null) {
			return
		}
		let result : OnSocketMessageCallbackResult = {
			data: data
		}

		const messageCallback = this.messageCallback;
		if (this.socketTasks.length > 0 && task === this.socketTasks[0] && messageCallback != null) {
			messageCallback(result);
		}

		const simpleTask = task as SimpleSocketTask;
		simpleTask.dispatchMessage(result);
	}

	onClose(client : WebsockerClient, code : number, reason : string) : void {
		const task = this.getTaskWithClient(client);
		if (task == null) {
			return
		}
		let result : OnSocketCloseCallbackResult = {
			code: code,
			reason: reason
		}

		const closeCallback = this.closeCallback;
		if (this.socketTasks.length > 0 && task === this.socketTasks[0] && closeCallback != null) {
			closeCallback(result);
		}

		const index = this.socketTasks.indexOf(task);
		this.socketTasks.splice(index, 1)

		const simpleTask = task as SimpleSocketTask;
		simpleTask.dispatchClose(result);

		this.taskMap.delete(client);
	}

	onError(client : WebsockerClient, msg : string) : void {
		const task = this.getTaskWithClient(client);
		if (task == null) {
			return
		}
		const errorCallback = this.errorCallback;
		if (this.socketTasks.length > 0 && task === this.socketTasks[0] && errorCallback != null) {
			let result : OnSocketErrorCallbackResult = {
				errMsg: msg
			}
			errorCallback(result);
		}

		const index = this.socketTasks.indexOf(task);
		this.socketTasks.splice(index, 1)

		let result : GeneralCallbackResult = {
			errMsg: msg
		}

		const simpleTask = task as SimpleSocketTask;
		simpleTask.dispatchError(result);

		this.taskMap.delete(client);
	}
}