import 'dart:io';
import 'dart:convert';
import 'package:jinja/jinja.dart' as jj;
import 'package:apidash/consts.dart';
import 'package:apidash/utils/utils.dart' show padMultilineString;
import 'package:apidash/models/models.dart' show RequestModel, rowsToMap;

class DartHttpCodeGen {
  String kTemplateUrl = """import 'package:http/http.dart' as http;

void main() async {
  var uri = Uri.parse('{{url}}');

""";

  String kTemplateParams = """

  var queryParams = {{params}};
""";
  int kParamsPadding = 20;

  String kStringUrlParams = """

  var urlQueryParams = Map<String,String>.from(uri.queryParameters);
  urlQueryParams.addAll(queryParams);
  uri = uri.replace(queryParameters: urlQueryParams);
""";

  String kStringNoUrlParams = """

  uri = uri.replace(queryParameters: queryParams);
""";

  String kTemplateBody = """

  String body = r'''{{body}}''';

""";

  String kBodyImportDartConvert = """
import 'dart:convert';
""";

  String kBodyLength = """

  var contentLength = utf8.encode(body).length;
""";

  String kTemplateHeaders = """

  var headers = {{headers}};

""";
  int kHeadersPadding = 16;

  String kTemplateRequest = """

  final response = await http.{{method}}(uri""";

  String kStringRequestHeaders = """,
                                  headers: headers""";

  String kStringRequestBody = """,
                                  body: body""";
  String kStringRequestEnd = """);
""";

  String kTemplateSingleSuccess = """

  if (response.statusCode == {{code}}) {
""";

  String kTemplateMultiSuccess = """

  if ({{codes}}.contains(response.statusCode)) {\n""";

  String kStringResult = r"""

    print('Status Code: ${response.statusCode}');
    print('Result: ${response.body}');
  }
  else{
    print('Error Status Code: ${response.statusCode}');
  }
}
""";

  String? getCode(RequestModel requestModel) {
    try {
      String result = "";
      bool hasHeaders = false;
      bool hasBody = false;

      String url = requestModel.url;
      if (!url.contains("://") && url.isNotEmpty) {
        url = kDefaultUriScheme + url;
      }
      var templateUrl = jj.Template(kTemplateUrl);
      result += templateUrl.render({"url": url});

      var paramsList = requestModel.requestParams;
      if (paramsList != null) {
        var params = rowsToMap(requestModel.requestParams) ?? {};
        if (params.isNotEmpty) {
          var templateParams = jj.Template(kTemplateParams);
          var paramsString = kEncoder.convert(params);
          paramsString = padMultilineString(paramsString, kParamsPadding);
          result += templateParams.render({"params": paramsString});
          Uri uri = Uri.parse(url);
          if (uri.hasQuery) {
            result += kStringUrlParams;
          } else {
            result += kStringNoUrlParams;
          }
        }
      }

      var method = requestModel.method;
      if (kMethodsWithBody.contains(method) &&
          requestModel.requestBody != null) {
        var contentLength = utf8.encode(requestModel.requestBody).length;
        if (contentLength > 0) {
          hasBody = true;
          var body = requestModel.requestBody;
          var templateBody = jj.Template(kTemplateBody);
          result += templateBody.render({"body": body});
          result = kBodyImportDartConvert + result;
          result += kBodyLength;
        }
      }

      var headersList = requestModel.requestHeaders;
      if (headersList != null || hasBody) {
        var headers = rowsToMap(requestModel.requestHeaders) ?? {};
        if (headers.isNotEmpty || hasBody) {
          hasHeaders = true;
          if (hasBody) {
            headers[HttpHeaders.contentLengthHeader] = r"$contentLength";
            switch (requestModel.requestBodyContentType) {
              case ContentType.json:
                headers[HttpHeaders.contentTypeHeader] = 'application/json';
                break;
              case ContentType.text:
                headers[HttpHeaders.contentTypeHeader] = 'text/plain';
                break;
            }
          }
          var headersString = kEncoder.convert(headers);
          headersString = padMultilineString(headersString, kHeadersPadding);
          var templateHeaders = jj.Template(kTemplateHeaders);
          result += templateHeaders.render({"headers": headersString});
        }
      }

      var templateRequest = jj.Template(kTemplateRequest);
      result += templateRequest.render({"method": method.name});

      if (hasHeaders) {
        result += kStringRequestHeaders;
      }

      if (hasBody) {
        result += kStringRequestBody;
      }

      result += kStringRequestEnd;

      var success = kCodegenSuccessStatusCodes[method]!;
      if (success.length > 1) {
        var templateMultiSuccess = jj.Template(kTemplateMultiSuccess);
        result += templateMultiSuccess.render({"codes": success});
      } else {
        var templateSingleSuccess = jj.Template(kTemplateSingleSuccess);
        result += templateSingleSuccess.render({"code": success[0]});
      }
      result += kStringResult;

      return result;
    } catch (e) {
      return null;
    }
  }
}