import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

import 'package:flutter_inappwebview_platform_interface/flutter_inappwebview_platform_interface.dart';

import 'in_app_webview/headless_in_app_webview.dart';
import 'platform_util.dart';

/// Object specifying creation parameters for creating a [WebPlatformCookieManager].
///
/// When adding additional fields make sure they can be null or have a default
/// value to avoid breaking changes. See [PlatformCookieManagerCreationParams] for
/// more information.
@immutable
class WebPlatformCookieManagerCreationParams
    extends PlatformCookieManagerCreationParams {
  /// Creates a new [WebPlatformCookieManagerCreationParams] instance.
  const WebPlatformCookieManagerCreationParams(
    // This parameter prevents breaking changes later.
    // ignore: avoid_unused_constructor_parameters
    PlatformCookieManagerCreationParams params,
  ) : super();

  /// Creates a [WebPlatformCookieManagerCreationParams] instance based on [PlatformCookieManagerCreationParams].
  factory WebPlatformCookieManagerCreationParams.fromPlatformCookieManagerCreationParams(
      PlatformCookieManagerCreationParams params) {
    return WebPlatformCookieManagerCreationParams(params);
  }
}

///{@macro flutter_inappwebview_platform_interface.PlatformCookieManager}
class WebPlatformCookieManager extends PlatformCookieManager
    with ChannelController {
  /// Creates a new [WebPlatformCookieManager].
  WebPlatformCookieManager(PlatformCookieManagerCreationParams params)
      : super.implementation(
          params is WebPlatformCookieManagerCreationParams
              ? params
              : WebPlatformCookieManagerCreationParams
                  .fromPlatformCookieManagerCreationParams(params),
        ) {
    channel = const MethodChannel(
        'com.pichillilorenzo/flutter_inappwebview_cookiemanager');
    handler = handleMethod;
    initMethodCallHandler();
  }

  static WebPlatformCookieManager? _instance;

  ///Gets the [WebPlatformCookieManager] shared instance.
  static WebPlatformCookieManager instance() {
    return (_instance != null) ? _instance! : _init();
  }

  static WebPlatformCookieManager _init() {
    _instance = WebPlatformCookieManager(WebPlatformCookieManagerCreationParams(
        const PlatformCookieManagerCreationParams()));
    return _instance!;
  }

  Future<dynamic> _handleMethod(MethodCall call) async {}

  @override
  Future<bool> setCookie(
      {required WebUri url,
      required String name,
      required String value,
      String path = "/",
      String? domain,
      int? expiresDate,
      int? maxAge,
      bool? isSecure,
      bool? isHttpOnly,
      HTTPCookieSameSitePolicy? sameSite,
      @Deprecated("Use webViewController instead")
      PlatformInAppWebViewController? iosBelow11WebViewController,
      PlatformInAppWebViewController? webViewController}) async {
    webViewController = webViewController ?? iosBelow11WebViewController;

    assert(url.toString().isNotEmpty);
    assert(name.isNotEmpty);
    assert(value.isNotEmpty);
    assert(path.isNotEmpty);

    await _setCookieWithJavaScript(
        url: url,
        name: name,
        value: value,
        domain: domain,
        path: path,
        expiresDate: expiresDate,
        maxAge: maxAge,
        isSecure: isSecure,
        sameSite: sameSite,
        webViewController: webViewController);
    return true;
  }

  Future<void> _setCookieWithJavaScript(
      {required WebUri url,
      required String name,
      required String value,
      String path = "/",
      String? domain,
      int? expiresDate,
      int? maxAge,
      bool? isSecure,
      HTTPCookieSameSitePolicy? sameSite,
      PlatformInAppWebViewController? webViewController}) async {
    var cookieValue = name + "=" + value + "; Path=" + path;

    if (domain != null) cookieValue += "; Domain=" + domain;

    if (expiresDate != null)
      cookieValue += "; Expires=" + await _getCookieExpirationDate(expiresDate);

    if (maxAge != null) cookieValue += "; Max-Age=" + maxAge.toString();

    if (isSecure != null && isSecure) cookieValue += "; Secure";

    if (sameSite != null)
      cookieValue += "; SameSite=" + sameSite.toNativeValue();

    cookieValue += ";";

    if (webViewController != null) {
      final javaScriptEnabled =
          (await webViewController.getSettings())?.javaScriptEnabled ?? false;
      if (javaScriptEnabled) {
        await webViewController.evaluateJavascript(
            source: 'document.cookie="$cookieValue"');
        return;
      }
    }

    final setCookieCompleter = Completer<void>();
    final headlessWebView =
        WebPlatformHeadlessInAppWebView(WebPlatformHeadlessInAppWebViewCreationParams(
            initialUrlRequest: URLRequest(url: url),
            onLoadStop: (controller, url) async {
              await controller.evaluateJavascript(
                  source: 'document.cookie="$cookieValue"');
              setCookieCompleter.complete();
            }));
    await headlessWebView.run();
    await setCookieCompleter.future;
    await headlessWebView.dispose();
  }

  @override
  Future<List<Cookie>> getCookies(
      {required WebUri url,
      @Deprecated("Use webViewController instead")
      PlatformInAppWebViewController? iosBelow11WebViewController,
      PlatformInAppWebViewController? webViewController}) async {
    assert(url.toString().isNotEmpty);

    webViewController = webViewController ?? iosBelow11WebViewController;

    return await _getCookiesWithJavaScript(
        url: url, webViewController: webViewController);
  }

  Future<List<Cookie>> _getCookiesWithJavaScript(
      {required WebUri url,
      PlatformInAppWebViewController? webViewController}) async {
    assert(url.toString().isNotEmpty);

    List<Cookie> cookies = [];

    if (webViewController != null) {
      final javaScriptEnabled =
          (await webViewController.getSettings())?.javaScriptEnabled ?? false;
      if (javaScriptEnabled) {
        List<String> documentCookies = (await webViewController
                .evaluateJavascript(source: 'document.cookie') as String)
            .split(';')
            .map((documentCookie) => documentCookie.trim())
            .toList();
        documentCookies.forEach((documentCookie) {
          List<String> cookie = documentCookie.split('=');
          if (cookie.length > 1) {
            cookies.add(Cookie(
              name: cookie[0],
              value: cookie[1],
            ));
          }
        });
        return cookies;
      }
    }

    final pageLoaded = Completer<void>();
    final headlessWebView =
        WebPlatformHeadlessInAppWebView(WebPlatformHeadlessInAppWebViewCreationParams(
      initialUrlRequest: URLRequest(url: url),
      onLoadStop: (controller, url) async {
        pageLoaded.complete();
      },
    ));
    await headlessWebView.run();
    await pageLoaded.future;

    List<String> documentCookies = (await headlessWebView.webViewController!
            .evaluateJavascript(source: 'document.cookie') as String)
        .split(';')
        .map((documentCookie) => documentCookie.trim())
        .toList();
    documentCookies.forEach((documentCookie) {
      List<String> cookie = documentCookie.split('=');
      if (cookie.length > 1) {
        cookies.add(Cookie(
          name: cookie[0],
          value: cookie[1],
        ));
      }
    });
    await headlessWebView.dispose();
    return cookies;
  }

  @override
  Future<Cookie?> getCookie(
      {required WebUri url,
      required String name,
      @Deprecated("Use webViewController instead")
      PlatformInAppWebViewController? iosBelow11WebViewController,
      PlatformInAppWebViewController? webViewController}) async {
    assert(url.toString().isNotEmpty);
    assert(name.isNotEmpty);

    webViewController = webViewController ?? iosBelow11WebViewController;

    List<Cookie> cookies = await _getCookiesWithJavaScript(
        url: url, webViewController: webViewController);
    return cookies
        .cast<Cookie?>()
        .firstWhere((cookie) => cookie!.name == name, orElse: () => null);
  }

  @override
  Future<void> deleteCookie(
      {required WebUri url,
      required String name,
      String path = "/",
      String? domain,
      @Deprecated("Use webViewController instead")
      PlatformInAppWebViewController? iosBelow11WebViewController,
      PlatformInAppWebViewController? webViewController}) async {
    assert(url.toString().isNotEmpty);
    assert(name.isNotEmpty);

    webViewController = webViewController ?? iosBelow11WebViewController;

    await _setCookieWithJavaScript(
        url: url,
        name: name,
        value: "",
        path: path,
        domain: domain,
        maxAge: -1,
        webViewController: webViewController);
    return;
  }

  @override
  Future<void> deleteCookies(
      {required WebUri url,
      String path = "/",
      String? domain,
      @Deprecated("Use webViewController instead")
      PlatformInAppWebViewController? iosBelow11WebViewController,
      PlatformInAppWebViewController? webViewController}) async {
    assert(url.toString().isNotEmpty);

    webViewController = webViewController ?? iosBelow11WebViewController;

    List<Cookie> cookies = await _getCookiesWithJavaScript(
        url: url, webViewController: webViewController);
    for (var i = 0; i < cookies.length; i++) {
      await _setCookieWithJavaScript(
          url: url,
          name: cookies[i].name,
          value: "",
          path: path,
          domain: domain,
          maxAge: -1,
          webViewController: webViewController);
    }
    return;
  }

  Future<String> _getCookieExpirationDate(int expiresDate) async {
    var platformUtil = PlatformUtil.instance();
    var dateTime = DateTime.fromMillisecondsSinceEpoch(expiresDate).toUtc();
    return await platformUtil.getWebCookieExpirationDate(date: dateTime);
  }

  @override
  void dispose() {
    // empty
  }
}

extension InternalCookieManager on WebPlatformCookieManager {
  get handleMethod => _handleMethod;
}