import { ApiReturn, WsClient } from "tsrpc-browser";
import { ServiceType } from "../shared/protocols/serviceProto_public";
import { NetUtil } from "./NetUtil";

export class WebsocketClient {
    public static EVENT_DISCONNECTED = 'WebsocketClient.EVENT_DISCONNECTED';
    protected _conn: WsClient<ServiceType> = null;
    protected _serverUrl = '';
    protected _eventHandlers: { [key: string]: { event: string, func: Function, thisArg: any }[] } = {};

    protected _handlers: { msg: string, func: Function, handler: Function, thisArg: any }[] = [];

    public get conn(): WsClient<ServiceType> {
        return this._conn;
    }

    createConnection(serverUrls: Readonly<string[]>) {
        if (this._conn) {
            this._conn.disconnect(1000, 'switch_server');
        }
        let index = Math.floor(serverUrls.length * Math.random());
        let serverUrl = serverUrls[index];
        this._serverUrl = serverUrl;
        this._conn = NetUtil.createWebsocketClient(this._serverUrl);

        this._conn.flows.postDisconnectFlow.push(v => {
            this._dispatchEvent(WebsocketClient.EVENT_DISCONNECTED, v);
            return v;
        });

        /*
        this._conn.flows.postRecvMsgFlow.push(v=>{
            console.log(v.msgName,v.msg);
            return v;
        });
        */
    }

    on(event: string, func: Function, thisArg?: any) {
        let handler = func;
        if (thisArg) {
            handler = func.bind(thisArg);
        }
        let handlers = this._eventHandlers[event] || [];
        handlers.push({ event: event, func: func, thisArg: thisArg });
        this._eventHandlers[event] = handlers;
    }

    off(event: string, func?: Function, thisArg?: any) {
        let handlers = this._eventHandlers[event];
        if (handlers) {
            for (let i = 0; i < handlers.length; ++i) {
                let item = handlers[i];
                if (item.func === func && item.thisArg == thisArg) {
                    handlers.splice(i, 1);
                    return;
                }
            }
        }
    }

    private _dispatchEvent(event: string, args) {
        let handlers = this._eventHandlers[event];
        if (handlers) {
            for (let i = 0; i < handlers.length; ++i) {
                let item = handlers[i];
                item.func.call(item.thisArg, args);
            }
        }
    }

    startPing() {
        setInterval(() => {
            if (this._conn.isConnected) {
                //console.log('ping');
                this._conn.sendMsg('Ping', {});
            }
        }, 5000);
    }

    public get serverUrl(): string {
        return this._serverUrl;
    }

    public listenMsg<T extends keyof ServiceType['msg']>(msgName: T | RegExp, func: Function, thisArg?: any) {
        let handler = func;
        if (thisArg) {
            handler = func.bind(thisArg);
        }
        //  console.log("添加监听 001",this._handlers);
        // console.log("添加监听 002",this._conn);
        this._handlers.push({ msg: msgName as string, func: func, handler: handler, thisArg: thisArg });
        this._conn.listenMsg(msgName, handler as any);
    }

    public unlistenMsg<T extends keyof ServiceType['msg']>(msgName: T | RegExp, func: Function, thisArg?: any) {
        for (let i = 0; i < this._handlers.length; ++i) {
            let item = this._handlers[i];
            if (item.msg === msgName && item.func === func || item.thisArg == thisArg) {
                // console.log("移除监听前 001====", item);
                this._handlers.splice(i, 1);
                this._conn.unlistenMsg(msgName, item.handler);
                item = null;
                break;
            }
        }
        console.log("移除监听后 002====", this._handlers);
    }

    public unlistenMsgAll<T extends keyof ServiceType['msg']>(msgName: T | RegExp): void {
        for (let i = this._handlers.length - 1; i >= 0; --i) {
            let item = this._handlers[i];
            if (item.msg === msgName) {
                this._handlers.splice(i, 1);
            }
        }
        this._conn.unlistenMsgAll(msgName);
        console.log("移除监听后", this._handlers);
    }

    public callApi<T extends string & keyof ServiceType['api']>(apiName: T, req: ServiceType['api'][T]['req'], options?: any): Promise<ApiReturn<ServiceType['api'][T]['res']>> {
        return this._conn.callApi(apiName, req, options);
    }

    public async ensureConnected() {
        let ret = await this._connect();
        return ret;
    }

    disconnect() {
        this._conn.disconnect();
    }

    private async _connect(): Promise<{ isSucc: boolean, err?: {code?:string, message: string } }> {
        // Connect
        let resConnect = await this._conn.connect();
        if (!resConnect.isSucc) {
            return { isSucc: false, err: { message: resConnect.errMsg } };
        }

        return { isSucc: true };
    }

    public get subRoomDisplayName() {
        return this.subRoomDisplayName;
    }
}