import 'dart:convert';

import 'package:flutter/widgets.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:webview_flutter/platform_interface.dart';
import 'package:webview_flutter/webview_flutter.dart';

class JavascriptInterface {
  final BuildContext context;
  final WebViewController? _controller;

  JavascriptInterface(
      BuildContext this.context, WebViewController? this._controller);

  Set<JavascriptChannel> getInterfaces() {
    List<JavascriptChannel> list = [];
    list.add(JavascriptChannel(
        name: 'yestv',
        onMessageReceived: (JavascriptMessage message) {
          var data = jsonDecode(message.message);
          String method = data["method"];
          var params = data["params"];
          String? _callback = data["callback"];
          switch (method) {
            case "toast":
              toast(params);
              break;
            case "getUid":
              getUid(params, _callback);
              break;
            case "getBaseRequestParams":
              getBaseRequestParams(params, _callback);
              break;
          }
        }));
    return list.toSet();
  }

  callback(String method, String params) {
    _controller!.evaluateJavascript("$method('$params')");
    _controller!.evaluateJavascript("delete $method");
  }

  //获取用户ID
  getUid(var params, String? callbackName) {
    if (callbackName != null) {
      callback(callbackName, "购");
    }
  }

  //toast
  toast(params) {
    if (params != null && params["msg"] != null) {
      Fluttertoast.showToast(msg: params["msg"]);
    }
  }

  //获取基本的网络请求参数
  getBaseRequestParams(var params, String? callbackName) {
    var ps = {};
    if (params != null) {
      ps.addAll(params);
    }
    String result = jsonEncode(ps);

    if (callbackName != null) {
      callback(callbackName, result);
    }
  }
}