import { Application, ChannelService, FrontendSession, RemoterClass } from 'pinus';

export default function (app: Application) {
    return new ChatRemote(app);
}

// rpc 定义挪到单独的定义文件(user.rpc.define.ts)。解决ts-node 有可能找不到定义的问题。
// 你也可以用其它方法解决，或者没有遇到过这个问题的话，定义还是可以放在这里。

// UserRpc的命名空间自动合并
// declare global {
//     interface UserRpc {
//         chat: {
//             chatRemote: RemoterClass<FrontendSession, ChatRemote>;
//         };
//     }
// }
export class ChatRemote {

    constructor(private app: Application) {
        this.app = app;
        this.channelService = app.get('channelService');
    }

    private channelService: ChannelService;

    /**
     * Add user into chat channel.
     *
     * @param {String} uid unique id for user
     * @param {String} sid server id
     * @param {String} name channel name
     * @param {boolean} flag channel parameter
     *
     */
    public async add(uid: string, sid: string, name: string, flag: boolean) {
        let channel = this.channelService.getChannel(name, flag);
        let username = uid.split('*')[0];
        let param = {
            user: username
        };
        channel.pushMessage('onAdd', param);

        if (!!channel) {
            channel.add(uid, sid);
        }

        return this.get(name, flag);
    }

    /**
     * Get user from chat channel.
     *
     * @param {Object} opts parameters for request
     * @param {String} name channel name
     * @param {boolean} flag channel parameter
     * @return {Array} users uids in channel
     *
     */
    private get(name: string, flag: boolean) {
        let users: string[] = [];
        let channel = this.channelService.getChannel(name, flag);
        if (!!channel) {
            users = channel.getMembers();
        }
        for (let i = 0; i < users.length; i++) {
            users[i] = users[i].split('*')[0];
        }
        return users;
    }

    /**
     * Kick user out chat channel.
     *
     * @param {String} uid unique id for user
     * @param {String} sid server id
     * @param {String} name channel name
     *
     */
    public async kick(uid: string, sid: string, name: string) {
        let channel = this.channelService.getChannel(name, false);
        // leave channel
        if (!!channel) {
            channel.leave(uid, sid);
        }
        let username = uid.split('*')[0];
        let param = {
            user: username
        };
        channel.pushMessage('onLeave', param);
    }
}