import 'dart:io';

import 'package:flutter/material.dart';

import 'package:kulinar_app/constants.dart';
import 'package:kulinar_app/views/image_subview.dart';
import 'package:kulinar_app/models/recipe_class.dart';
import 'package:kulinar_app/widgets/toastbar_widget.dart';
import 'package:kulinar_app/widgets/custom_markdown_style.dart';
import 'package:kulinar_app/models/data/recipe_data_class.dart';
import 'package:kulinar_app/widgets/page_route_transitions.dart';
import 'package:kulinar_app/widgets/utility_icon_row_widget.dart';
import 'package:kulinar_app/models/data/shoplist_data_class.dart';
import 'package:kulinar_app/models/data/settings_data_class.dart';

import 'package:flutter_markdown/flutter_markdown.dart';
import 'package:path_provider/path_provider.dart';
import 'package:image_picker/image_picker.dart';
import 'package:share_plus/share_plus.dart';

import 'package:flutter_gen/gen_l10n/app_localizations.dart';

class RecipeSubview extends StatefulWidget {
  const RecipeSubview({Key? key, this.remote = false, this.recipe, this.redrawCallback, this.showToastCallback}) : super(key: key);

  final bool remote;
  final Recipe? recipe;
  final Function? redrawCallback;
  final Function? showToastCallback;

  @override
  RecipeSubviewState createState() => RecipeSubviewState();
}

class RecipeSubviewState extends State<RecipeSubview> {
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
  final TextEditingController _controller1 = TextEditingController();
  final TextEditingController _controller2 = TextEditingController();
  final FocusNode _detailsTitleFocus = FocusNode();
  final FocusNode _detailsTextFocus = FocusNode();
  Recipe _unsavedRecipe = Recipe();
  bool _isEditModeEnabled = false;
  Recipe? _removedRecipe;

  @override
  Widget build(BuildContext context) {
    // TODO: Refactor to easier code
    if (widget.recipe != null && _unsavedRecipe.isDefault()) _unsavedRecipe = widget.recipe!;

    if (_unsavedRecipe.isDefault()) {
      _controller1.clear();
      _controller2.clear();
      _isEditModeEnabled = true;
    } else {
      _controller1.text = _unsavedRecipe.title ?? "";
      _controller2.text = _unsavedRecipe.description ?? "";
    }

    return Scaffold(
      key: _scaffoldKey,
      appBar: _buildAppBar(context, _unsavedRecipe),
      body: GestureDetector(
        onTap: () {
          _detailsTextFocus.requestFocus();
          _controller2.selection = TextSelection.fromPosition(TextPosition(offset: _controller2.text.length));
        },
        child: Form(
          key: _formKey,
          child: ListView(
            children: [
              _buildUtilityRow(),
              _buildTitleInput(),
              _buildImage(),
              _buildDescriptionInput(),
            ],
          ),
        ),
      ),
    );
  }

  void _cacheUnsavedRecipe() {
    _unsavedRecipe.title = _controller1.text;
    _unsavedRecipe.description = _controller2.text;
  }

  void _addRecipe({Recipe? passedRecipe}) {
    if (passedRecipe != null) {
      RecipeData.recipeList.add(passedRecipe);
      RecipeData.save();
      return;
    }

    if (!_formKey.currentState!.validate()) return;

    _unsavedRecipe.title = _controller1.text;
    _unsavedRecipe.description = _controller2.text;

    if (_isEditModeEnabled) {
      if (!RecipeData.recipeList.contains(_unsavedRecipe)) RecipeData.recipeList.add(_unsavedRecipe);
      RecipeData.save();
    }

    _isEditModeEnabled = false;

    if (widget.recipe == null) {
      Navigator.pop(context);
    } else {
      setState(() {});
    }
  }

  void _removeRecipe(BuildContext _) {
    Navigator.pop(context);
    RecipeData.recipeList.remove(widget.recipe);
    RecipeData.save();

    _removedRecipe = widget.recipe;

    String content = AppLocalizations.of(context)!.removed;
    String actionLabel = AppLocalizations.of(context)!.undo;

    if (widget.showToastCallback != null) {
      widget.showToastCallback!(content, actionLabel, () {
        _addRecipe(passedRecipe: _removedRecipe);
        widget.redrawCallback!();
      });
    }

    setState(() {});
  }

  // TODO: This might introduce bugs later (sanitize); maybe use FileHandler?
  void downloadRecipe(BuildContext context, Recipe recipe) async {
    RecipeData.recipeList.add(recipe);
    ToastBar.showToastBar(context, AppLocalizations.of(context)!.downloadSuccess);

    setState(() {});
  }

  void _pickImage() async {
    XFile? pickedFile;

    if (SettingsData.settings["photoSource"] == "0") {
      pickedFile = await ImagePicker().pickImage(source: ImageSource.camera);
    } else {
      pickedFile = await ImagePicker().pickImage(source: ImageSource.gallery);
    }

    if (pickedFile != null) {
      Directory directory = await getApplicationDocumentsDirectory();
      String name = DateTime.now().millisecondsSinceEpoch.toString();
      File file = File("${directory.path}/$name");

      file.writeAsBytes(await pickedFile.readAsBytes());
      _unsavedRecipe.image = file.path;

      RecipeData.save();
    }

    setState(() {});
  }

  void _removeImage() async {
    _unsavedRecipe.image = null;
    await RecipeData.save();

    setState(() {});
  }

  Widget _buildUtilityRow() {
    if (widget.remote) {
      return const SizedBox(
        height: 10.0,
        width: double.infinity,
      );
    } else {
      // _buildAppBarPhotoActions(recipe),
      return UtilityIconRow(
        remote: widget.remote,
        isEditModeEnabled: _isEditModeEnabled,
        unsavedRecipe: _unsavedRecipe,
        pickImageCallback: _pickImage,
        removeImageCallback: _removeImage,
        removeRecipeCallback: _removeRecipe,
        downloadRecipeCallback: downloadRecipe,
        cacheUnsavedRecipeCallback: _cacheUnsavedRecipe,
      );
    }
  }

  Widget _buildTitleInput() {
    return Padding(
      padding: const EdgeInsets.only(right: 20.0, left: 20.0),
      child: TextFormField(
        controller: _controller1,
        style: cRecipeTitleStyle,
        cursorColor: cPrimaryColor,
        enabled: _isEditModeEnabled,
        focusNode: _detailsTitleFocus,
        textInputAction: TextInputAction.next,
        decoration: InputDecoration(
          hintText: AppLocalizations.of(context)!.inputHint,
          hintStyle: cInputHintStyle,
        ),
        onFieldSubmitted: (_) {
          _detailsTitleFocus.unfocus();
          FocusScope.of(context).requestFocus(_detailsTextFocus);
        },
        validator: (input) {
          if (input == "" || input!.trim().isEmpty) return AppLocalizations.of(context)!.inputError;

          return null;
        },
      ),
    );
  }

  Widget _buildImage() {
    if (_unsavedRecipe.image != null) {
      return Padding(
        padding: const EdgeInsets.only(top: 12.0, left: 20.0, right: 20.0),
        child: GestureDetector(
          child: ClipRRect(
            borderRadius: BorderRadius.circular(10.0),
            child: Hero(
              tag: "image",
              child: Image(
                image: FileImage(
                  File(_unsavedRecipe.image!),
                ),
              ),
            ),
          ),
          onTap: () {
            Navigator.push(
              context,
              FadeRoute(child: ImageSubview(image: _unsavedRecipe.image!)),
            );
          },
        ),
      );
    }

    return Container();
  }

  Widget _buildDescriptionInput() {
    return Padding(
      padding: const EdgeInsets.all(18.0),
      child: _isEditModeEnabled ? _buildInputDescription() : _buildMarkdownDescription(),
    );
  }

  TextField _buildInputDescription() {
    return TextField(
      expands: true,
      maxLines: null,
      minLines: null,
      decoration: null,
      controller: _controller2,
      cursorColor: cPrimaryColor,
      focusNode: _detailsTextFocus,
      style: cRecipeDescriptionStyle,
      enableInteractiveSelection: true,
      // TODO: only replace with code with same function
      // ignore: deprecated_member_use
      toolbarOptions: const ToolbarOptions(
        copy: true,
        cut: true,
        paste: true,
        selectAll: true,
      ),
    );
  }

  MarkdownBody _buildMarkdownDescription() {
    return MarkdownBody(
      styleSheet: CustomMarkdownStyle.sheet(),
      data: _controller2.text,
      selectable: true,
      onTapLink: (text, href, title) => {},
      imageBuilder: (uri, title, alt) => Container(),
      // styleSheet: CustomMarkdownStyle(),
    );
  }

  void _shareData(BuildContext _) {
    Share.share("${_unsavedRecipe.title}\n\n${_unsavedRecipe.description}", subject: _unsavedRecipe.title);
  }

  void _addToShoppingList(BuildContext _) {
    final ingredients = _unsavedRecipe.description!.split("\n")..retainWhere((element) => element.startsWith("- "));

    if (ingredients.isEmpty) {
      widget.showToastCallback!(AppLocalizations.of(context)!.ingredientsError, "", () {});
      return;
    }

    for (String ingredient in ingredients) {
      String item = ingredient.substring(2).trim();

      if (!ShoplistData.shoplist.contains(item)) {
        ShoplistData.shoplist.add(item);
      }
    }

    ShoplistData.save();

    if (widget.showToastCallback != null) {
      widget.showToastCallback!(AppLocalizations.of(context)!.ingredientsAdded, "", () {});
    }
  }

  void _uploadRecipe(BuildContext context) async {
    return;
  }

  List<Widget> _buildAppBarActions(BuildContext context, Recipe recipe) {
    final actionList = [_shareData, _addToShoppingList, _uploadRecipe, _removeRecipe];

    List<Widget> localActions = [
      _buildAppBarCheckActions(),
      PopupMenuButton(
        onSelected: (int value) => actionList.elementAt(value)(context),
        itemBuilder: (BuildContext context) => [
          PopupMenuItem<int>(value: 0, child: Text(AppLocalizations.of(context)!.menu1)),
          PopupMenuItem<int>(value: 1, child: Text(AppLocalizations.of(context)!.menu2)),
          PopupMenuItem<int>(value: 2, child: Text(AppLocalizations.of(context)!.menu3)),
          PopupMenuItem<int>(value: 3, child: Text(AppLocalizations.of(context)!.menu4)),
        ],
      ),
    ];

    List<Widget> remoteDownloadAction = [
      IconButton(
        icon: const Icon(Icons.save_alt_rounded),
        onPressed: () {
          downloadRecipe(context, recipe);
        },
      ),
    ];

    List<Widget> remoteLookupAction = [
      const IconButton(
        icon: Icon(Icons.menu_open_rounded),
        onPressed: null,
      ),
    ];

    if (widget.remote && RecipeData.recipeList.contains(recipe)) return remoteLookupAction;
    if (widget.remote) return remoteDownloadAction;

    return localActions;
  }

  PreferredSizeWidget _buildAppBar(BuildContext context, Recipe recipe) {
    String title = AppLocalizations.of(context)!.mode1;

    if (_isEditModeEnabled) title = AppLocalizations.of(context)!.mode2;

    return AppBar(
      title: Text(title),
      leading: IconButton(
        icon: const Icon(Icons.close),
        onPressed: () {
          Navigator.pop(context);
        },
      ),
      actions: _buildAppBarActions(context, recipe),
    );
  }

  Widget _buildAppBarCheckActions() {
    if (_isEditModeEnabled) {
      return IconButton(
        icon: const Icon(Icons.check),
        onPressed: _addRecipe,
      );
    } else {
      return IconButton(
        icon: const Icon(Icons.edit),
        onPressed: () {
          _isEditModeEnabled = true;

          setState(() {});
        },
      );
    }
  }
}