import 'dart:io' show File;

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_quill/extensions.dart' as base;
import 'package:flutter_quill/flutter_quill.dart' hide Text;
import 'package:flutter_quill/translations.dart';
import 'package:math_keyboard/math_keyboard.dart';
import 'package:universal_html/html.dart' as html;

import '../shims/dart_ui_fake.dart'
    if (dart.library.html) 'package:flutter_quill_extensions/shims/dart_ui_real.dart'
    as ui;
import 'embed_types.dart';
import 'utils.dart';
import 'widgets/image.dart';
import 'widgets/image_resizer.dart';
import 'widgets/video_app.dart';
import 'widgets/youtube_video_app.dart';

class ImageEmbedBuilder extends EmbedBuilder {
  ImageEmbedBuilder({
    required this.afterRemoveImageFromEditor,
    required this.shouldRemoveImageFromEditor,
  });
  final ImageEmbedBuilderAfterRemoveImageFromEditor afterRemoveImageFromEditor;
  final ImageEmbedBuilderShouldRemoveImageFromEditor
      shouldRemoveImageFromEditor;

  @override
  String get key => BlockEmbed.imageType;

  @override
  bool get expanded => false;

  @override
  Widget build(
    BuildContext context,
    QuillController controller,
    base.Embed node,
    bool readOnly,
    bool inline,
    TextStyle textStyle,
  ) {
    assert(!kIsWeb, 'Please provide image EmbedBuilder for Web');

    Widget image = const SizedBox.shrink();
    final imageUrl = standardizeImageUrl(node.value.data);
    OptionalSize? imageSize;
    final style = node.style.attributes['style'];
    if (base.isMobile() && style != null) {
      final attrs = base.parseKeyValuePairs(style.value.toString(), {
        Attribute.mobileWidth,
        Attribute.mobileHeight,
        Attribute.mobileMargin,
        Attribute.mobileAlignment
      });
      if (attrs.isNotEmpty) {
        assert(
            attrs[Attribute.mobileWidth] != null &&
                attrs[Attribute.mobileHeight] != null,
            'mobileWidth and mobileHeight must be specified');
        final w = double.parse(attrs[Attribute.mobileWidth]!);
        final h = double.parse(attrs[Attribute.mobileHeight]!);
        imageSize = OptionalSize(w, h);
        final m = attrs[Attribute.mobileMargin] == null
            ? 0.0
            : double.parse(attrs[Attribute.mobileMargin]!);
        final a = base.getAlignment(attrs[Attribute.mobileAlignment]);
        image = Padding(
            padding: EdgeInsets.all(m),
            child: imageByUrl(imageUrl, width: w, height: h, alignment: a));
      }
    }

    if (imageSize == null) {
      image = imageByUrl(imageUrl);
      imageSize = OptionalSize((image as Image).width, image.height);
    }

    if (!readOnly && base.isMobile()) {
      return GestureDetector(
        onTap: () {
          showDialog(
              context: context,
              builder: (context) {
                final resizeOption = _SimpleDialogItem(
                  icon: Icons.settings_outlined,
                  color: Colors.lightBlueAccent,
                  text: 'Resize'.i18n,
                  onPressed: () {
                    Navigator.pop(context);
                    showCupertinoModalPopup<void>(
                        context: context,
                        builder: (context) {
                          final screenSize = MediaQuery.of(context).size;
                          return ImageResizer(
                              onImageResize: (w, h) {
                                final res = getEmbedNode(
                                    controller, controller.selection.start);
                                final attr = base.replaceStyleString(
                                    getImageStyleString(controller), w, h);
                                controller
                                  ..skipRequestKeyboard = true
                                  ..formatText(
                                      res.offset, 1, StyleAttribute(attr));
                              },
                              imageWidth: imageSize?.width,
                              imageHeight: imageSize?.height,
                              maxWidth: screenSize.width,
                              maxHeight: screenSize.height);
                        });
                  },
                );
                final copyOption = _SimpleDialogItem(
                  icon: Icons.copy_all_outlined,
                  color: Colors.cyanAccent,
                  text: 'Copy'.i18n,
                  onPressed: () {
                    final imageNode =
                        getEmbedNode(controller, controller.selection.start)
                            .value;
                    final imageUrl = imageNode.value.data;
                    controller.copiedImageUrl =
                        ImageUrl(imageUrl, getImageStyleString(controller));
                    Navigator.pop(context);
                  },
                );
                final removeOption = _SimpleDialogItem(
                  icon: Icons.delete_forever_outlined,
                  color: Colors.red.shade200,
                  text: 'Remove'.i18n,
                  onPressed: () async {
                    Navigator.of(context).pop();

                    final imageFile = File(imageUrl);
                    final shouldRemoveImage =
                        await shouldRemoveImageFromEditor(imageFile);

                    if (!shouldRemoveImage) {
                      return;
                    }
                    final offset = getEmbedNode(
                      controller,
                      controller.selection.start,
                    ).offset;
                    controller.replaceText(
                      offset,
                      1,
                      '',
                      TextSelection.collapsed(offset: offset),
                    );
                    await afterRemoveImageFromEditor(imageFile);
                  },
                );
                return Padding(
                  padding: const EdgeInsets.fromLTRB(50, 0, 50, 0),
                  child: SimpleDialog(
                      shape: const RoundedRectangleBorder(
                          borderRadius: BorderRadius.all(Radius.circular(10))),
                      children: [resizeOption, copyOption, removeOption]),
                );
              });
        },
        child: image,
      );
    }

    if (!readOnly || !base.isMobile() || isImageBase64(imageUrl)) {
      return image;
    }

    // We provide option menu for mobile platform excluding base64 image
    return _menuOptionsForReadonlyImage(
      context,
      imageUrl,
      image,
    );
  }
}

class ImageEmbedBuilderWeb extends EmbedBuilder {
  ImageEmbedBuilderWeb({this.constraints})
      : assert(kIsWeb, 'ImageEmbedBuilderWeb is only for web platform');

  final BoxConstraints? constraints;

  @override
  String get key => BlockEmbed.imageType;

  @override
  Widget build(
    BuildContext context,
    QuillController controller,
    Embed node,
    bool readOnly,
    bool inline,
    TextStyle textStyle,
  ) {
    final imageUrl = node.value.data;

    ui.platformViewRegistry.registerViewFactory(imageUrl, (viewId) {
      return html.ImageElement()
        ..src = imageUrl
        ..style.height = 'auto'
        ..style.width = 'auto';
    });

    return ConstrainedBox(
      constraints: constraints ?? BoxConstraints.loose(const Size(200, 200)),
      child: HtmlElementView(
        viewType: imageUrl,
      ),
    );
  }
}

class VideoEmbedBuilder extends EmbedBuilder {
  VideoEmbedBuilder({this.onVideoInit});

  final void Function(GlobalKey videoContainerKey)? onVideoInit;

  @override
  String get key => BlockEmbed.videoType;

  @override
  Widget build(
    BuildContext context,
    QuillController controller,
    base.Embed node,
    bool readOnly,
    bool inline,
    TextStyle textStyle,
  ) {
    assert(!kIsWeb, 'Please provide video EmbedBuilder for Web');

    final videoUrl = node.value.data;
    if (videoUrl.contains('youtube.com') || videoUrl.contains('youtu.be')) {
      return YoutubeVideoApp(
          videoUrl: videoUrl, context: context, readOnly: readOnly);
    }
    return VideoApp(
      videoUrl: videoUrl,
      context: context,
      readOnly: readOnly,
      onVideoInit: onVideoInit,
    );
  }
}

class FormulaEmbedBuilder extends EmbedBuilder {
  @override
  String get key => BlockEmbed.formulaType;

  @override
  Widget build(
    BuildContext context,
    QuillController controller,
    base.Embed node,
    bool readOnly,
    bool inline,
    TextStyle textStyle,
  ) {
    assert(!kIsWeb, 'Please provide formula EmbedBuilder for Web');

    final mathController = MathFieldEditingController();
    return Focus(
      onFocusChange: (hasFocus) {
        if (hasFocus) {
          // If the MathField is tapped, hides the built in keyboard
          SystemChannels.textInput.invokeMethod('TextInput.hide');
          debugPrint(mathController.currentEditingValue());
        }
      },
      child: MathField(
        controller: mathController,
        variables: const ['x', 'y', 'z'],
        onChanged: (value) {},
        onSubmitted: (value) {},
      ),
    );
  }
}

Widget _menuOptionsForReadonlyImage(
    BuildContext context, String imageUrl, Widget image) {
  return GestureDetector(
      onTap: () {
        showDialog(
            context: context,
            builder: (context) {
              final saveOption = _SimpleDialogItem(
                icon: Icons.save,
                color: Colors.greenAccent,
                text: 'Save'.i18n,
                onPressed: () async {
                  imageUrl = appendFileExtensionToImageUrl(imageUrl);
                  final messenger = ScaffoldMessenger.of(context);
                  Navigator.of(context).pop();

                  final saveImageResult = await saveImage(imageUrl);
                  final imageSavedSuccessfully = saveImageResult.isSuccess;

                  messenger.clearSnackBars();

                  if (!imageSavedSuccessfully) {
                    // TODO: Please translate this
                    messenger.showSnackBar(const SnackBar(
                        content: Text(
                      'Error while saveing the image',
                    )));
                    return;
                  }

                  var message = 'Saved'.i18n;
                  switch (saveImageResult.method) {
                    // TODO: Please translate this too
                    case SaveImageResultMethod.network:
                      message += ' using the network.';
                      break;
                    case SaveImageResultMethod.localStorage:
                      message += ' using the local storage.';
                      break;
                  }

                  messenger.showSnackBar(
                    SnackBar(
                      content: Text(message),
                    ),
                  );
                },
              );
              final zoomOption = _SimpleDialogItem(
                icon: Icons.zoom_in,
                color: Colors.cyanAccent,
                text: 'Zoom'.i18n,
                onPressed: () {
                  Navigator.pushReplacement(
                      context,
                      MaterialPageRoute(
                          builder: (context) =>
                              ImageTapWrapper(imageUrl: imageUrl)));
                },
              );
              return Padding(
                padding: const EdgeInsets.fromLTRB(50, 0, 50, 0),
                child: SimpleDialog(
                    shape: const RoundedRectangleBorder(
                        borderRadius: BorderRadius.all(Radius.circular(10))),
                    children: [saveOption, zoomOption]),
              );
            });
      },
      child: image);
}

class _SimpleDialogItem extends StatelessWidget {
  const _SimpleDialogItem(
      {required this.icon,
      required this.color,
      required this.text,
      required this.onPressed,
      Key? key})
      : super(key: key);

  final IconData icon;
  final Color color;
  final String text;
  final VoidCallback onPressed;

  @override
  Widget build(BuildContext context) {
    return SimpleDialogOption(
      onPressed: onPressed,
      child: Row(
        children: [
          Icon(icon, size: 36, color: color),
          Padding(
            padding: const EdgeInsetsDirectional.only(start: 16),
            child:
                Text(text, style: const TextStyle(fontWeight: FontWeight.bold)),
          ),
        ],
      ),
    );
  }
}