import 'dart:convert';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
import 'package:isekai_wiki/api/base_api.dart';

import 'package:isekai_wiki/global.dart';

import '../../utils/api_utils.dart';

class MWError {
  String? code;
  String? info;
  String? detail;

  MWError({this.code, this.info, this.detail});

  static MWError fromMap(Map errorMap) {
    var mwError = MWError();
    if (errorMap.containsKey("code")) {
      mwError.code = errorMap["code"].toString();
    }

    if (errorMap.containsKey("info")) {
      mwError.info = errorMap["info"].toString();
    }

    if (errorMap.containsKey("*")) {
      mwError.detail = errorMap["*"].toString();
    }

    return mwError;
  }
}

class MWMultiError extends Error {
  List<MWError> errorList;

  MWMultiError(this.errorList);

  @override
  String toString() {
    return errorList.map((e) => e.info).join("\n");
  }
}

class MWResponse<T> {
  bool ok = false;
  List<MWError>? errorList;
  T? data;
  Map<String, String>? continueInfo;

  MWResponse({this.ok = false, this.errorList, this.data, this.continueInfo});
}

class MWApiClient extends http.BaseClient {
  final http.Client _inner;

  MWApiClient(this._inner);

  Future<http.StreamedResponse> send(http.BaseRequest request) async {
    request.headers['user-agent'] = await ApiUtils.getUserAgent();
    return await _inner.send(request);
  }
}

class MWApi {
  static Uri apiBaseUri = Uri.parse(Global.wikiApiUrl);

  static HttpClient getHttpClient() {
    return HttpClient();
  }

  static Future<Map<String, String>> _getHeaders() async {
    var headers = {
      "X-IsekaiWikiApp-Version": Global.packageInfo?.version ?? "unknow",
    };

    if (!kIsWeb) {
      headers["User-Agent"] = await ApiUtils.getUserAgent();
    }

    return headers;
  }

  static Future<MWResponse<Map<String, dynamic>>> get(String action,
      {Map<String, dynamic>? query}) async {
    Map<String, String> queryStr =
        query?.map((key, value) => MapEntry(key, value.toString())) ?? {};
    queryStr.addAll({
      "action": action,
      "format": "json",
      "formatversion": "2",
      "uselang": Global.wikiLang,
    });
    if (Global.webOrigin != null) {
      queryStr["origin"] = Global.webOrigin!;
    }

    Uri requestUri = apiBaseUri.replace(queryParameters: queryStr);

    var res = await http.get(requestUri, headers: await _getHeaders());

    if (res.statusCode != 200) {
      throw HttpResponseCodeError(res.statusCode);
    }

    var responseBody = res.body;

    return parseMWResponse(action, responseBody);
  }

  static MWResponse<Map<String, dynamic>> parseMWResponse(String action, String resJson) {
    var mwRes = MWResponse<Map<String, dynamic>>();
    List<MWError> errorList = [];

    var resData = jsonDecode(resJson);
    if (resData is Map) {
      // 处理请求错误
      var resError = resData["error"];
      if (resError is Map) {
        errorList.add(MWError.fromMap(resError));
      } else if (resError is List) {
        for (var errItem in resError) {
          if (errItem is Map) {
            errorList.add(MWError.fromMap(errItem));
          }
        }
      }
      if (errorList.isNotEmpty) {
        mwRes.errorList = errorList;
        return mwRes;
      }

      // 请求结果
      if (resData.containsKey(action) && resData[action] is Map) {
        mwRes.data = resData[action] as Map<String, dynamic>;
        mwRes.ok = true;
      }

      // 继续查询参数
      var batchcomplete = resData["batchcomplete"];
      if (batchcomplete is bool && batchcomplete) {
        var continueInfo = resData["continue"];
        if (continueInfo is Map) {
          mwRes.continueInfo = {};
          continueInfo.forEach((key, value) {
            var keyStr = key.toString();
            mwRes.continueInfo![keyStr] = value.toString();
          });
        }
      }
    }

    return mwRes;
  }
}