import 'package:cake_wallet/entities/wallet_type.dart';
import 'package:cake_wallet/src/widgets/blockchain_height_widget.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:cake_wallet/palette.dart';
import 'package:cake_wallet/core/seed_validator.dart';
import 'package:cake_wallet/src/widgets/primary_button.dart';
import 'package:cake_wallet/entities/mnemonic_item.dart';
import 'package:cake_wallet/generated/i18n.dart';
import 'package:flutter/widgets.dart';

class Annotation extends Comparable<Annotation> {
  Annotation({@required this.range, this.style});

  final TextRange range;
  final TextStyle style;

  @override
  int compareTo(Annotation other) => range.start.compareTo(other.range.start);
}

class TextAnnotation extends Comparable<TextAnnotation> {
  TextAnnotation({@required this.text, this.style});

  final TextStyle style;
  final String text;

  @override
  int compareTo(TextAnnotation other) => text.compareTo(other.text);
}

class AnnotatedEditableText extends EditableText {
  AnnotatedEditableText({
    Key key,
    FocusNode focusNode,
    TextEditingController controller,
    TextStyle style,
    ValueChanged<String> onChanged,
    ValueChanged<String> onSubmitted,
    Color cursorColor,
    Color selectionColor,
    Color backgroundCursorColor,
    TextSelectionControls selectionControls,
    @required this.words,
  })  : textAnnotations = words
            .map((word) => TextAnnotation(
                text: word,
                style: TextStyle(
                    color: Colors.black,
                    backgroundColor: Colors.transparent,
                    fontWeight: FontWeight.normal,
                    fontSize: 20)))
            .toList(),
        super(
          maxLines: null,
          key: key,
          focusNode: focusNode,
          controller: controller,
          cursorColor: cursorColor,
          style: style,
          keyboardType: TextInputType.text,
          autocorrect: false,
          autofocus: false,
          selectionColor: selectionColor,
          selectionControls: selectionControls,
          backgroundCursorColor: backgroundCursorColor,
          onChanged: onChanged,
          onSubmitted: onSubmitted,
          toolbarOptions: const ToolbarOptions(
            copy: true,
            cut: true,
            paste: true,
            selectAll: true,
          ),
          enableSuggestions: false,
          enableInteractiveSelection: true,
          showSelectionHandles: true,
          showCursor: true,
        ) {
    textAnnotations.add(TextAnnotation(
        text: ' ', style: TextStyle(backgroundColor: Colors.transparent)));
  }

  final List<String> words;
  final List<TextAnnotation> textAnnotations;

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

class AnnotatedEditableTextState extends EditableTextState {
  @override
  AnnotatedEditableText get widget => super.widget as AnnotatedEditableText;

  List<Annotation> getRanges() {
    final source = widget.textAnnotations
        .map((item) => range(item.text, textEditingValue.text)
            .map((range) => Annotation(style: item.style, range: range)))
        .expand((e) => e)
        .toList();
    final result = List<Annotation>();
    final text = textEditingValue.text;
    source.sort();
    Annotation prev;

    for (var item in source) {
      if (prev == null) {
        if (item.range.start > 0) {
          result.add(Annotation(
              range: TextRange(start: 0, end: item.range.start),
              style: TextStyle(
                  color: Colors.black, backgroundColor: Colors.transparent)));
        }
        result.add(item);
        prev = item;
        continue;
      } else {
        if (prev.range.end > item.range.start) {
          // throw StateError('Invalid (intersecting) ranges for annotated field');
        } else if (prev.range.end < item.range.start) {
          result.add(Annotation(
              range: TextRange(start: prev.range.end, end: item.range.start),
              style: TextStyle(
                  color: Colors.red, backgroundColor: Colors.transparent)));
        }

        result.add(item);
        prev = item;
      }
    }

    if (result.length > 0 && result.last.range.end < text.length) {
      result.add(Annotation(
          range: TextRange(start: result.last.range.end, end: text.length),
          style: TextStyle( backgroundColor: Colors.transparent)));
    }
    return result;
  }

  List<TextRange> range(String pattern, String source) {
    final result = List<TextRange>();

    for (int index = source.indexOf(pattern);
        index >= 0;
        index = source.indexOf(pattern, index + 1)) {
      final start = index;
      final end = start + pattern.length;
      result.add(TextRange(start: start, end: end));
    }

    return result;
  }

  @override
  TextSpan buildTextSpan() {
    final text = textEditingValue.text;
    final ranges = getRanges();

    if (ranges.isNotEmpty) {
      return TextSpan(
          style: widget.style,
          children: ranges
              .map((item) => TextSpan(
                  style: item.style, text: item.range.textInside(text)))
              .toList());
    }

    return TextSpan(style: widget.style, text: text);
  }
}

class SeedWidget extends StatefulWidget {
  SeedWidget(
      {Key key,
      this.maxLength,
      this.onMnemonicChange,
      this.onFinish,
      this.leading,
      this.middle,
      this.validator})
      : super(key: key);

  final int maxLength;
  final Function(List<MnemonicItem>) onMnemonicChange;
  final Function() onFinish;
  final SeedValidator validator;
  final Widget leading;
  final Widget middle;

  @override
  SeedWidgetState createState() => SeedWidgetState(maxLength: maxLength);
}

class SeedWidgetState extends State<SeedWidget> {
  SeedWidgetState({this.maxLength});

  List<MnemonicItem> items = <MnemonicItem>[];
  final int maxLength;
  final _seedController = TextEditingController();
  final _seedTextFieldKey = GlobalKey();
  MnemonicItem selectedItem;
  bool isValid;
  String errorMessage;

  List<MnemonicItem> currentMnemonics;
  bool isCurrentMnemonicValid;
  String _errorMessage;

  @override
  void initState() {
    super.initState();
    showPlaceholder = true;
    isValid = false;
    isCurrentMnemonicValid = false;
    _seedController
        .addListener(() => changeCurrentMnemonic(_seedController.text));
    focusNode.addListener(() => setState(() =>
        showPlaceholder = !focusNode.hasFocus && controller.text.isEmpty));
  }

  void addMnemonic(String text) {
    setState(() => items.add(MnemonicItem(text: text.trim().toLowerCase())));
    _seedController.text = '';

    if (widget.onMnemonicChange != null) {
      widget.onMnemonicChange(items);
    }
  }

  void mnemonicFromText(String text) {
    final splitted = text.split(' ');

    if (splitted.length >= 2) {
      for (final text in splitted) {
        if (text == ' ' || text.isEmpty) {
          continue;
        }

        if (selectedItem != null) {
          editTextOfSelectedMnemonic(text);
        } else {
          addMnemonic(text);
        }
      }
    }
  }

  void selectMnemonic(MnemonicItem item) {
    setState(() {
      selectedItem = item;
      currentMnemonics = [item];

      _seedController
        ..text = item.text
        ..selection = TextSelection.collapsed(offset: item.text.length);
    });
  }

  void onMnemonicTap(MnemonicItem item) {
    if (selectedItem == item) {
      setState(() => selectedItem = null);
      _seedController.text = '';
      return;
    }

    selectMnemonic(item);
  }

  void editTextOfSelectedMnemonic(String text) {
    setState(() => selectedItem.changeText(text));
    selectedItem = null;
    _seedController.text = '';

    if (widget.onMnemonicChange != null) {
      widget.onMnemonicChange(items);
    }
  }

  void clear() {
    setState(() {
      items = [];
      selectedItem = null;
      _seedController.text = '';

      if (widget.onMnemonicChange != null) {
        widget.onMnemonicChange(items);
      }
    });
  }

  void invalidate() => setState(() => isValid = false);

  void validated() => setState(() => isValid = true);

  void setErrorMessage(String errorMessage) =>
      setState(() => this.errorMessage = errorMessage);

  void replaceText(String text) {
    setState(() => items = []);
    mnemonicFromText(text);
  }

  void changeCurrentMnemonic(String text) {
    setState(() {
      final trimmedText = text.trim();
      final splitted = trimmedText.split(' ');
      _errorMessage = null;

      if (text == null) {
        currentMnemonics = [];
        isCurrentMnemonicValid = false;
        return;
      }

      currentMnemonics =
          splitted.map((text) => MnemonicItem(text: text)).toList();

      var isValid = true;

      for (final word in currentMnemonics) {
        isValid = widget.validator.isValid(word);

        if (!isValid) {
          break;
        }
      }

      isCurrentMnemonicValid = isValid;
    });
  }

  void saveCurrentMnemonicToItems() {
    setState(() {
      if (selectedItem != null) {
        selectedItem.changeText(currentMnemonics.first.text.trim());
        selectedItem = null;
      } else {
        items.addAll(currentMnemonics);
      }

      currentMnemonics = [];
      _seedController.text = '';
    });
  }

  void showErrorIfExist() {
    setState(() => _errorMessage =
        !isCurrentMnemonicValid ? S.current.incorrect_seed : null);
  }

  bool isSeedValid() {
    bool isValid;

    for (final item in items) {
      isValid = widget.validator.isValid(item);

      if (!isValid) {
        break;
      }
    }

    return isValid;
  }

  final controller = TextEditingController();
  final focusNode = FocusNode();

  bool showPlaceholder;

  final words =
      SeedValidator.getWordList(type: WalletType.monero, language: 'en');

  Future<void> _pasteAddress() async {
    final value = await Clipboard.getData('text/plain');

    if (value?.text?.isNotEmpty ?? false) {
      controller.text = value.text;
    }
  }

  @override
  Widget build(BuildContext context) {
    print('build');
    return Container(
        child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisAlignment: MainAxisAlignment.start,
            children: [
          Stack(children: [
            SizedBox(height: 35),
            if (showPlaceholder)
              Positioned(
                  top: 10,
                  left: 0,
                  child: Text('Enter your seed',
                      style: TextStyle(
                          fontSize: 16.0, color: Theme.of(context).hintColor))),
            Padding(
                padding: EdgeInsets.only(right: 40, top: 10),
                child: AnnotatedEditableText(
                    cursorColor: Colors.green,
                    backgroundCursorColor: Colors.blue,
                    style: TextStyle(
                        fontSize: 20,
                        color: Colors.red,
                        fontWeight: FontWeight.normal,
                        backgroundColor: Colors.transparent),
                    focusNode: focusNode,
                    controller: controller,
                    words: words)),
            Positioned(
                top: 0,
                right: 0,
                child: Container(
                    width: 34,
                    height: 34,
                    child: InkWell(
                      onTap: () async => _pasteAddress(),
                      child: Container(
                          decoration: BoxDecoration(
                              color: Theme.of(context).hintColor,
                              borderRadius:
                                  BorderRadius.all(Radius.circular(6))),
                          child: Image.asset('assets/images/duplicate.png',
                              color: Theme.of(context)
                                  .primaryTextTheme
                                  .display1
                                  .decorationColor)),
                    )))
          ]),
          Container(
              margin: EdgeInsets.only(top: 15),
              height: 1.0,
              color: Theme.of(context).primaryTextTheme.title.backgroundColor),
        ]));
    // return Container(
    //   child: Column(children: [
    //     Flexible(
    //       fit: FlexFit.tight,
    //       flex: 2,
    //       child: Container(
    //           width: double.infinity,
    //           height: double.infinity,
    //           padding: EdgeInsets.all(0),
    //           decoration: BoxDecoration(
    //               borderRadius: BorderRadius.only(
    //                   bottomLeft: Radius.circular(24),
    //                   bottomRight: Radius.circular(24)),
    //               gradient: LinearGradient(colors: [
    //                 Theme.of(context).primaryTextTheme.subhead.color,
    //                 Theme.of(context).primaryTextTheme.subhead.decorationColor,
    //               ], begin: Alignment.topLeft, end: Alignment.bottomRight)),
    //           child: Column(
    //             children: <Widget>[
    //               CupertinoNavigationBar(
    //                 leading: widget.leading,
    //                 middle: widget.middle,
    //                 backgroundColor: Colors.transparent,
    //                 border: null,
    //               ),
    //               Expanded(
    //                   child: Container(
    //                 padding: EdgeInsets.all(24),
    //                 alignment: Alignment.topLeft,
    //                 child: SingleChildScrollView(
    //                   child: Column(
    //                     mainAxisAlignment: MainAxisAlignment.start,
    //                     crossAxisAlignment: CrossAxisAlignment.start,
    //                     children: <Widget>[
    //                       Text(
    //                         S.of(context).restore_active_seed,
    //                         style: TextStyle(
    //                             fontSize: 14,
    //                             fontWeight: FontWeight.w500,
    //                             color: Theme.of(context)
    //                                 .textTheme
    //                                 .overline
    //                                 .backgroundColor),
    //                       ),
    //                       Padding(
    //                           padding: EdgeInsets.only(top: 5),
    //                           child: Wrap(
    //                             children: items.map((item) {
    //                               final isValid =
    //                                   widget.validator.isValid(item);
    //                               final isSelected = selectedItem == item;
    //
    //                               return InkWell(
    //                                 onTap: () => onMnemonicTap(item),
    //                                 child: Container(
    //                                     decoration: BoxDecoration(
    //                                         color: isValid
    //                                             ? Colors.transparent
    //                                             : Palette.red),
    //                                     margin: EdgeInsets.only(
    //                                         right: 7, bottom: 8),
    //                                     child: Text(
    //                                       item.toString(),
    //                                       style: TextStyle(
    //                                           color: isValid
    //                                               ? Colors.white
    //                                               : Colors.grey,
    //                                           fontSize: 16,
    //                                           fontWeight: isSelected
    //                                               ? FontWeight.w900
    //                                               : FontWeight.w600,
    //                                           decoration: isSelected
    //                                               ? TextDecoration.underline
    //                                               : TextDecoration.none),
    //                                     )),
    //                               );
    //                             }).toList(),
    //                           ))
    //                     ],
    //                   ),
    //                 ),
    //               ))
    //             ],
    //           )),
    //     ),
    //     Flexible(
    //         fit: FlexFit.tight,
    //         flex: 3,
    //         child: Padding(
    //           padding:
    //               EdgeInsets.only(left: 24, top: 48, right: 24, bottom: 24),
    //           child: Column(
    //               mainAxisAlignment: MainAxisAlignment.start,
    //               crossAxisAlignment: CrossAxisAlignment.center,
    //               children: <Widget>[
    //                 Text(
    //                   S.of(context).restore_new_seed,
    //                   style: TextStyle(
    //                       fontSize: 20,
    //                       fontWeight: FontWeight.w500,
    //                       color:
    //                           Theme.of(context).primaryTextTheme.title.color),
    //                 ),
    //                 Padding(
    //                   padding: EdgeInsets.only(top: 24),
    //                   child: TextFormField(
    //                     key: _seedTextFieldKey,
    //                     onFieldSubmitted: (text) => isCurrentMnemonicValid
    //                         ? saveCurrentMnemonicToItems()
    //                         : null,
    //                     style: TextStyle(
    //                         fontSize: 16.0,
    //                         fontWeight: FontWeight.normal,
    //                         color:
    //                             Theme.of(context).primaryTextTheme.title.color),
    //                     controller: _seedController,
    //                     textInputAction: TextInputAction.done,
    //                     decoration: InputDecoration(
    //                         suffixIcon: GestureDetector(
    //                           behavior: HitTestBehavior.opaque,
    //                           child: ConstrainedBox(
    //                             constraints: BoxConstraints(maxWidth: 145),
    //                             child: Row(
    //                               mainAxisAlignment: MainAxisAlignment.end,
    //                               children: <Widget>[
    //                                 Text('${items.length}/$maxLength',
    //                                     style: TextStyle(
    //                                         color: Theme.of(context)
    //                                             .accentTextTheme
    //                                             .display2
    //                                             .decorationColor,
    //                                         fontWeight: FontWeight.normal,
    //                                         fontSize: 16)),
    //                                 SizedBox(width: 10),
    //                                 InkWell(
    //                                   onTap: () async =>
    //                                       Clipboard.getData('text/plain').then(
    //                                           (clipboard) =>
    //                                               replaceText(clipboard.text)),
    //                                   child: Container(
    //                                       height: 35,
    //                                       padding: EdgeInsets.all(7),
    //                                       decoration: BoxDecoration(
    //                                           color: Theme.of(context)
    //                                               .accentTextTheme
    //                                               .caption
    //                                               .color,
    //                                           borderRadius:
    //                                               BorderRadius.circular(10.0)),
    //                                       child: Text(
    //                                         S.of(context).paste,
    //                                         style: TextStyle(
    //                                             color: Palette.blueCraiola),
    //                                       )),
    //                                 )
    //                               ],
    //                             ),
    //                           ),
    //                         ),
    //                         hintStyle: TextStyle(
    //                             color: Theme.of(context)
    //                                 .accentTextTheme
    //                                 .display2
    //                                 .decorationColor,
    //                             fontWeight: FontWeight.normal,
    //                             fontSize: 16),
    //                         hintText:
    //                             S.of(context).restore_from_seed_placeholder,
    //                         errorText: _errorMessage,
    //                         focusedBorder: UnderlineInputBorder(
    //                             borderSide: BorderSide(
    //                                 color: Theme.of(context)
    //                                     .accentTextTheme
    //                                     .subtitle
    //                                     .backgroundColor,
    //                                 width: 1.0)),
    //                         enabledBorder: UnderlineInputBorder(
    //                             borderSide: BorderSide(
    //                                 color: Theme.of(context)
    //                                     .accentTextTheme
    //                                     .subtitle
    //                                     .backgroundColor,
    //                                 width: 1.0))),
    //                     enableInteractiveSelection: false,
    //                   ),
    //                 )
    //               ]),
    //         )),
    //     Padding(
    //         padding: EdgeInsets.only(left: 24, right: 24, bottom: 24),
    //         child: Row(
    //           children: <Widget>[
    //             Flexible(
    //                 child: Padding(
    //               padding: EdgeInsets.only(right: 8),
    //               child: PrimaryButton(
    //                 onPressed: clear,
    //                 text: S.of(context).clear,
    //                 color: Colors.orange,
    //                 textColor: Colors.white,
    //                 isDisabled: items.isEmpty,
    //               ),
    //             )),
    //             Flexible(
    //               child: Padding(
    //                 padding: EdgeInsets.only(left: 8),
    //                 child: (selectedItem == null && items.length == maxLength)
    //                     ? PrimaryButton(
    //                         text: S.of(context).restore_next,
    //                         isDisabled: !isSeedValid(),
    //                         onPressed: () => widget.onFinish != null
    //                             ? widget.onFinish()
    //                             : null,
    //                         color: Theme.of(context).accentTextTheme.body2.color,
    //                         textColor: Colors.white)
    //                     : PrimaryButton(
    //                         text: selectedItem != null
    //                             ? S.of(context).save
    //                             : S.of(context).add_new_word,
    //                         onPressed: () => isCurrentMnemonicValid
    //                             ? saveCurrentMnemonicToItems()
    //                             : null,
    //                         onDisabledPressed: () => showErrorIfExist(),
    //                         isDisabled: !isCurrentMnemonicValid,
    //                         color: Theme.of(context).accentTextTheme.body2.color,
    //                         textColor: Colors.white),
    //               ),
    //             )
    //           ],
    //         ))
    //   ]),
    // );
  }
}