// Dart imports:
import 'dart:convert';
import 'dart:core';

// Flutter imports:
import 'package:flutter/foundation.dart';

// Package imports:
import 'package:http/http.dart' as http;
import 'package:http/http.dart';
import 'package:version/version.dart';

// Project imports:
import 'package:invoiceninja_flutter/.env.dart';
import 'package:invoiceninja_flutter/constants.dart';
import 'package:invoiceninja_flutter/utils/formatting.dart';
import 'package:invoiceninja_flutter/utils/strings.dart';

class WebClient {
  const WebClient();

  Future<dynamic> get(
    String url,
    String token, {
    bool rawResponse = false,
  }) async {
    if (Config.DEMO_MODE) {
      throw 'Server requests are not supported in the demo';
    }

    if (!url.contains('?')) {
      url += '?';
    }
    print('GET: $url');

    if (url.contains('invoiceninja.com')) {
      url += '&per_page=$kMaxRecordsPerApiPage';
    } else {
      url += '&per_page=999999';
    }

    final client = http.Client();
    final http.Response response = await client.get(
      Uri.parse(url),
      headers: _getHeaders(url, token),
    );
    client.close();

    if (rawResponse) {
      return response;
    }

    _checkResponse(response);

    final dynamic jsonResponse = json.decode(response.body);

    //debugPrint(response.body, wrapWidth: 1000);

    return jsonResponse;
  }

  Future<dynamic> post(
    String url,
    String token, {
    dynamic data,
    List<MultipartFile> multipartFiles,
    String secret,
    String password,
    String idToken,
    bool rawResponse = false,
  }) async {
    if (Config.DEMO_MODE) {
      throw 'Server requests are not supported in the demo';
    }

    if (!url.contains('?')) {
      url += '?';
    }

    print('POST: $url');
    if (!kReleaseMode && Config.DEBUG_REQUESTS) {
      printWrapped('Data: $data');
    }
    http.Response response;

    if (multipartFiles != null) {
      response = await _uploadFiles(url, token, multipartFiles, data: data);
    } else {
      final headers = _getHeaders(
        url,
        token,
        secret: secret,
        password: password,
        idToken: idToken,
      );
      //print('Headers: $headers');

      final client = http.Client();
      response = await client
          .post(
            Uri.parse(url),
            body: data,
            headers: headers,
          )
          .timeout(
            Duration(
              seconds: rawResponse ? kMaxRawPostSeconds : kMaxPostSeconds,
            ),
          );
      client.close();
    }

    if (rawResponse) {
      return response;
    }

    _checkResponse(response);

    return json.decode(response.body);
  }

  Future<dynamic> put(
    String url,
    String token, {
    dynamic data,
    MultipartFile multipartFile,
    String fileIndex = 'file',
    String password,
    String idToken,
  }) async {
    if (Config.DEMO_MODE) {
      throw 'Server requests are not supported in the demo';
    }

    if (!url.contains('?')) {
      url += '?';
    }

    print('PUT: $url');
    if (!kReleaseMode && Config.DEBUG_REQUESTS) {
      printWrapped('Data: $data');
    }
    http.Response response;

    if (multipartFile != null) {
      response = await _uploadFiles(url, token, [multipartFile],
          fileIndex: fileIndex, data: data, method: 'PUT');
    } else {
      final client = http.Client();
      response = await client.put(
        Uri.parse(url),
        body: data,
        headers: _getHeaders(
          url,
          token,
          password: password,
          idToken: idToken,
        ),
      );
      client.close();
    }

    _checkResponse(response);

    return json.decode(response.body);
  }

  Future<dynamic> delete(
    String url,
    String token, {
    String password,
    String idToken,
    dynamic data,
  }) async {
    if (Config.DEMO_MODE) {
      throw 'Server requests are not supported in the demo';
    }

    if (!url.contains('?')) {
      url += '?';
    }

    print('Delete: $url');

    final client = http.Client();
    final http.Response response = await client.delete(
      Uri.parse(url),
      headers: _getHeaders(
        url,
        token,
        password: password,
        idToken: idToken,
      ),
      body: data,
    );
    client.close();

    _checkResponse(response);

    return json.decode(response.body);
  }
}

Map<String, String> _getHeaders(
  String url,
  String token, {
  String secret,
  String password,
  String idToken,
}) {
  if (url.startsWith(Constants.hostedApiUrl)) {
    secret = Config.API_SECRET;
  }
  final headers = {
    'X-CLIENT-VERSION': kClientVersion,
    'X-API-SECRET': secret,
    'X-Requested-With': 'XMLHttpRequest',
    'Content-Type': 'application/json; charset=utf-8',
  };

  if ((token ?? '').isNotEmpty) {
    headers['X-API-Token'] = token;
  }

  if ((idToken ?? '').isNotEmpty) {
    headers['X-API-OAUTH-PASSWORD'] = idToken;
  }

  if ((password ?? '').isNotEmpty) {
    headers['X-API-PASSWORD-BASE64'] = base64Encode(utf8.encode(password));
  }

  return headers;
}

void _checkResponse(http.Response response) {
  /*
  debugPrint(
      'response: ${response.statusCode} ${response.body.substring(0, min(response.body.length, 30000))}',
      wrapWidth: 1000);
  debugPrint('response: ${response.statusCode} ${response.body}');
   */

  if (!kReleaseMode) {
    print('Response: ${formatSize(response.body.length)}');
    if (Config.DEBUG_REQUESTS) {
      printWrapped('${response.statusCode} ${response.body}');
      print('Headers: ${response.headers}');
    }
  }

  final serverVersion = response.headers['x-app-version'];
  final minClientVersion = response.headers['x-minimum-client-version'];

  if (response.statusCode >= 500) {
    throw _parseError(response.statusCode, response.body);
  } else if (serverVersion == null) {
    throw 'Error: please check that Invoice Ninja v5 is installed on the server';
  } else if (Version.parse(kClientVersion) < Version.parse(minClientVersion)) {
    throw 'Error: client not supported, please update to the latest version [Current v$kClientVersion < Minimum v$minClientVersion]';
  } else if (Version.parse(serverVersion) < Version.parse(kMinServerVersion)) {
    throw 'Error: server not supported, please update to the latest version [Current v$serverVersion < Minimum v$kMinServerVersion]';
  } else if (response.statusCode >= 400) {
    throw _parseError(response.statusCode, response.body);
  }
}

String _parseError(int code, String response) {
  dynamic message = response;

  if (response.contains('DOCTYPE html')) {
    return '$code: An error occurred';
  }

  try {
    final dynamic jsonResponse = json.decode(response);

    message = jsonResponse['message'] ?? jsonResponse;

    if (jsonResponse['errors'] != null &&
        (jsonResponse['errors'] as Map).isNotEmpty) {
      message += '\n';
      try {
        jsonResponse['errors'].forEach((String field, dynamic errors) {
          (errors as List<dynamic>)
              .forEach((dynamic error) => message += '\n • $error');
        });
      } catch (error) {
        print('Failed to parse error: $error');
      }
    }
  } catch (error) {
    print('Failed to parse error: $error');
  }

  return '$code: $message';
}

Future<http.Response> _uploadFiles(
    String url, String token, List<MultipartFile> multipartFiles,
    {String method = 'POST', String fileIndex = 'file', dynamic data}) async {
  final request = http.MultipartRequest(method, Uri.parse(url))
    ..fields.addAll(data ?? {})
    ..headers.addAll(_getHeaders(url, token))
    ..files.addAll(multipartFiles);

  return await http.Response.fromStream(await request.send())
      .timeout(const Duration(minutes: 10));
}