import Application from '../application';
import * as define from '../util/define';
import { I_encodeDecodeConfig } from '../util/interfaceDefine';

let app: Application;
export function init(_app: Application) {
    app = _app;
}

export const default_encodeDecode: Required<I_encodeDecodeConfig> = {
    protoDecode: function (data: Buffer) {
        return {
            cmd: data.readUInt16BE(1),
            msg: data.subarray(3)
        };
    },
    msgDecode: function (cmd: number, msg: Buffer) {
        return JSON.parse(msg.toString());
    },
    protoEncode: function (cmd: number, msg: any) {
        const msgBuf: Buffer = app.msgEncode(cmd, msg);
        const buf = Buffer.allocUnsafe(msgBuf.length + 7);
        buf.writeUInt32BE(msgBuf.length + 3, 0);
        buf.writeUInt8(define.Server_To_Client.msg, 4);
        buf.writeUInt16BE(cmd, 5);
        msgBuf.copy(buf, 7);
        return buf;
    },
    msgEncode: function (cmd: number, msg: any) {
        return Buffer.from(JSON.stringify(msg));
    }
};