import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:http/http.dart' as http;
import 'package:http/http.dart';
import 'package:logging/logging.dart';
import 'package:result_monad/result_monad.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';

import '../../globals.dart';
import '../../models/exec_error.dart';
import '../../models/networking/paged_response.dart';
import '../globals_services.dart';
import '../rp_provider_extension.dart';
import '../settings_services.dart';

part 'network_services.g.dart';

http.Response requestTimeout() => http.Response('Client side timeout', 408);

class NetworkRequest {
  final Uri url;
  final Map<String, dynamic>? body;
  final Map<String, String> headers;
  final Duration? timeout;

  NetworkRequest(
    this.url, {
    this.body,
    this.headers = const {},
    this.timeout,
  });

  @override
  String toString() {
    return 'NetworkRequest{url: $url, body: $body, headers: $headers, timeout: $timeout}';
  }

  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is NetworkRequest &&
          runtimeType == other.runtimeType &&
          url == other.url &&
          mapEquals(body, other.body) &&
          mapEquals(headers, other.headers) &&
          timeout == other.timeout;

  @override
  int get hashCode =>
      url.hashCode ^
      Object.hashAll(body?.entries.toList() ?? []) ^
      Object.hashAll(headers.entries.toList()) ^
      timeout.hashCode;
}

final _logger = Logger('NetworkServicesProviders');

extension _DebounceAndCancelExtension on Ref {
  /// Wait for [duration] (defaults to 500ms), and then return a [http.Client]
  /// which can be used to make a request.
  ///
  /// That client will automatically be closed when the provider is disposed.
  Future<http.Client> getDebouncedHttpClient([Duration? duration]) async {
    // First, we handle debouncing.
    var didDispose = false;
    onDispose(() => didDispose = true);

    // We delay multiple requests in a row within a specified interval or 0.5 s
    await Future<void>.delayed(duration ?? const Duration(milliseconds: 500));

    // If the provider was disposed during the delay, it means that the user
    // refreshed again. We throw an exception to cancel the request.
    // It is safe to use an exception here, as it will be caught by Riverpod.
    if (didDispose) {
      throw Exception('Cancelled');
    }

    // We now create the client and close it when the provider is disposed.
    final client = http.Client();
    onDispose(client.close);

    // Finally, we return the client to allow our provider to make the request.
    return client;
  }
}

@riverpod
Map<String, String> userAgentHeader(Ref ref) {
  final userAgent = ref.watch(userAgentProvider);
  return {
    'user-agent': userAgent,
  };
}

@riverpod
Future<Result<Uint8List, ExecError>> httpGetRawBytes(
  Ref ref,
  NetworkRequest request,
) async {
  _logger.fine('GET Raw Bytes: ${request.url}');
  //TODO determine if this timeout needs to be the timeout for the call or how long it sticks around for after it is first executed
  final timeoutSetting = ref.read(friendicaApiTimeoutSettingProvider);
  final timeout = request.timeout ?? timeoutSetting;
  ref.cacheFor(timeout);
  final requestHeaders = Map<String, String>.from(request.headers);
  if (usePhpDebugging) {
    requestHeaders['Cookie'] = 'XDEBUG_SESSION=PHPSTORM;path=/';
  }
  try {
    final client = await ref.getDebouncedHttpClient();
    final httpRequest = client.get(
      request.url,
      headers: requestHeaders,
    );

    final response = await httpRequest.timeout(
      timeout,
      onTimeout: requestTimeout,
    );

    if (response.statusCode != 200) {
      return Result.error(_buildErrorFromResponse(response));
    }

    return Result.ok(response.bodyBytes);
  } catch (e) {
    return Result.error(
        ExecError(type: ErrorType.localError, message: e.toString()));
  }
}

@riverpod
Future<Result<PagedResponse<String>, ExecError>> httpGet(
  Ref ref,
  NetworkRequest request,
) async {
  _logger.fine('GET: ${request.url}');
  //TODO determine if this timeout needs to be the timeout for the call or how long it sticks around for after it is first executed
  final timeoutSetting = ref.read(friendicaApiTimeoutSettingProvider);
  final timeout = request.timeout ?? timeoutSetting;
  ref.cacheFor(timeout);
  final requestHeaders = Map<String, String>.from(request.headers);
  if (usePhpDebugging) {
    requestHeaders['Cookie'] = 'XDEBUG_SESSION=PHPSTORM;path=/';
  }
  try {
    final client = await ref.getDebouncedHttpClient();
    final httpRequest = client.get(
      request.url,
      headers: requestHeaders,
    );

    final response = await httpRequest.timeout(
      timeout,
      onTimeout: requestTimeout,
    );

    if (response.statusCode != 200) {
      return Result.error(_buildErrorFromResponse(response));
    }
    return PagedResponse.fromLinkHeader(
      response.headers['link'],
      utf8.decode(response.bodyBytes),
    );
  } catch (e) {
    return Result.error(
        ExecError(type: ErrorType.localError, message: e.toString()));
  }
}

@riverpod
Future<Result<String, ExecError>> httpPost(
  Ref ref,
  NetworkRequest request,
) async {
  _logger.fine('POST: ${request.url} \n Body: ${request.body}');
  final timeoutSetting = ref.read(friendicaApiTimeoutSettingProvider);
  final timeout = request.timeout ?? timeoutSetting;
  ref.cacheFor(timeout);
  final requestHeaders = Map<String, String>.from(request.headers);
  if (usePhpDebugging) {
    requestHeaders['Cookie'] = 'XDEBUG_SESSION=PHPSTORM;path=/';
  }
  try {
    final client = await ref.getDebouncedHttpClient();

    final httpRequest = client.post(
      request.url,
      headers: requestHeaders,
      body: jsonEncode(request.body),
    );

    final response = await httpRequest.timeout(
      timeout,
      onTimeout: requestTimeout,
    );

    if (response.statusCode != 200) {
      return Result.error(_buildErrorFromResponse(response));
    }
    return Result.ok(utf8.decode(response.bodyBytes));
  } catch (e) {
    return Result.error(
        ExecError(type: ErrorType.localError, message: e.toString()));
  }
}

@riverpod
Future<Result<String, ExecError>> httpPut(
  Ref ref,
  NetworkRequest request,
) async {
  _logger.fine('PUT: ${request.url} \n Body: ${request.body}');
  final timeoutSetting = ref.read(friendicaApiTimeoutSettingProvider);
  final timeout = request.timeout ?? timeoutSetting;
  ref.cacheFor(timeout);
  final requestHeaders = Map<String, String>.from(request.headers);
  if (usePhpDebugging) {
    requestHeaders['Cookie'] = 'XDEBUG_SESSION=PHPSTORM;path=/';
  }
  try {
    final client = await ref.getDebouncedHttpClient();

    final httpRequest = client.put(
      request.url,
      headers: requestHeaders,
      body: jsonEncode(request.body),
    );

    final response = await httpRequest.timeout(
      timeout,
      onTimeout: requestTimeout,
    );

    if (response.statusCode != 200) {
      return Result.error(_buildErrorFromResponse(response));
    }
    return Result.ok(utf8.decode(response.bodyBytes));
  } catch (e) {
    return Result.error(
        ExecError(type: ErrorType.localError, message: e.toString()));
  }
}

@riverpod
Future<Result<String, ExecError>> httpDelete(
  Ref ref,
  NetworkRequest request,
) async {
  _logger.fine('DELETE: ${request.url}');
  final timeoutSetting = ref.read(friendicaApiTimeoutSettingProvider);
  final timeout = request.timeout ?? timeoutSetting;
  ref.cacheFor(timeout);
  final requestHeaders = Map<String, String>.from(request.headers);
  if (usePhpDebugging) {
    requestHeaders['Cookie'] = 'XDEBUG_SESSION=PHPSTORM;path=/';
  }
  try {
    final client = await ref.getDebouncedHttpClient();

    final httpRequest = client.delete(
      request.url,
      headers: requestHeaders,
      body: jsonEncode(request.body),
    );

    final response = await httpRequest.timeout(
      timeout,
      onTimeout: requestTimeout,
    );

    if (response.statusCode != 200) {
      return Result.error(_buildErrorFromResponse(response));
    }
    return Result.ok(utf8.decode(response.bodyBytes));
  } catch (e) {
    return Result.error(
        ExecError(type: ErrorType.localError, message: e.toString()));
  }
}

ExecError _buildErrorFromResponse(Response response) {
  final type = switch (response.statusCode) {
    401 => ErrorType.authentication,
    404 => ErrorType.notFound,
    408 => ErrorType.timeoutError,
    _ => ErrorType.serverError,
  };
  final msg = '${response.statusCode}: ${response.reasonPhrase}';
  return ExecError(type: type, message: msg);
}