import 'package:cake_wallet/src/widgets/primary_button.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/src/domain/monero/mnemonics/english.dart';
import 'package:cake_wallet/src/domain/monero/mnemonics/chinese_simplified.dart';
import 'package:cake_wallet/src/domain/monero/mnemonics/dutch.dart';
import 'package:cake_wallet/src/domain/monero/mnemonics/german.dart';
import 'package:cake_wallet/src/domain/monero/mnemonics/japanese.dart';
import 'package:cake_wallet/src/domain/monero/mnemonics/portuguese.dart';
import 'package:cake_wallet/src/domain/monero/mnemonics/russian.dart';
import 'package:cake_wallet/src/domain/monero/mnemonics/spanish.dart';
import 'package:cake_wallet/src/domain/common/mnemotic_item.dart';
import 'package:cake_wallet/generated/i18n.dart';
import 'package:cake_wallet/src/widgets/top_panel.dart';

class SeedWidget extends StatefulWidget {
  SeedWidget({Key key, this.onMnemoticChange, this.onFinish, this.seedLanguage}) : super(key: key) {
    switch (seedLanguage) {
      case 'English':
        words = EnglishMnemonics.words;
        break;
      case 'Chinese (simplified)':
        words = ChineseSimplifiedMnemonics.words;
        break;
      case 'Dutch':
        words = DutchMnemonics.words;
        break;
      case 'German':
        words = GermanMnemonics.words;
        break;
      case 'Japanese':
        words = JapaneseMnemonics.words;
        break;
      case 'Portuguese':
        words = PortugueseMnemonics.words;
        break;
      case 'Russian':
        words = RussianMnemonics.words;
        break;
      case 'Spanish':
        words = SpanishMnemonics.words;
        break;
      default:
        words = EnglishMnemonics.words;
    }
  }

  final Function(List<MnemoticItem>) onMnemoticChange;
  final Function() onFinish;
  final String seedLanguage;
  List<String> words;

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

class SeedWidgetState extends State<SeedWidget> {
  static const maxLength = 25;

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

  List<MnemoticItem> currentMnemotics;
  bool isCurrentMnemoticValid;
  String _errorMessage;

  @override
  void initState() {
    super.initState();
    isValid = false;
    isCurrentMnemoticValid = false;
    _seedController
        .addListener(() => changeCurrentMnemotic(_seedController.text));
  }

  void addMnemotic(String text) {
    setState(() => items.add(MnemoticItem(
        text: text.trim().toLowerCase(), dic: widget.words)));
    _seedController.text = '';

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

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

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

        if (selectedItem != null) {
          editTextOfSelectedMnemotic(text);
        } else {
          addMnemotic(text);
        }
      }
    }
  }

  void selectMnemotic(MnemoticItem item) {
    setState(() {
      selectedItem = item;
      currentMnemotics = [item];

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

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

    selectMnemotic(item);
  }

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

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

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

      if (widget.onMnemoticChange != null) {
        widget.onMnemoticChange(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 = []);
    mnemoticFromText(text);
  }

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

      if (text == null) {
        currentMnemotics = [];
        isCurrentMnemoticValid = false;
        return;
      }

      currentMnemotics = splitted
          .map((text) => MnemoticItem(text: text, dic: widget.words))
          .toList();

      bool isValid = true;

      for (final word in currentMnemotics) {
        isValid = word.isCorrect();

        if (!isValid) {
          break;
        }
      }

      isCurrentMnemoticValid = isValid;
    });
  }

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

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

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

  bool isSeedValid() {
    bool isValid;

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

      if (!isValid) {
        break;
      }
    }

    return isValid;
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(children: [
        Flexible(
            fit: FlexFit.tight,
            flex: 1,
            child: TopPanel(
                height: null,
                color: PaletteDark.menuList,
                widget: SingleChildScrollView(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.start,
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      Text(
                        S.of(context).restore_active_seed,
                        style: TextStyle(
                            fontSize: 14,
                            color: PaletteDark.walletCardText
                        ),
                      ),
                      Padding(
                          padding: EdgeInsets.only(top: 5),
                          child: Wrap(
                            children: items.map((item) {
                              final isValid = item.isCorrect();
                              final isSelected = selectedItem == item;

                              return InkWell(
                                onTap: () => onMnemoticTap(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 : Palette.lightGrey,
                                          fontSize: 16,
                                          fontWeight:
                                          isSelected ? FontWeight.w900 : FontWeight.w400,
                                          decoration: isSelected
                                              ? TextDecoration.underline
                                              : TextDecoration.none),
                                    )),
                              );
                            }).toList(),)
                      )
                    ],
                  ),
                )
            )
        ),
        Flexible(
            fit: FlexFit.tight,
            flex: 2,
            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: 18,
                    fontWeight: FontWeight.bold,
                    color: Colors.white
                  ),
                ),
                Padding(
                  padding: EdgeInsets.only(top: 24),
                  child: TextFormField(
                    key: _seedTextFieldKey,
                    onFieldSubmitted: (text) => isCurrentMnemoticValid
                        ? saveCurrentMnemoticToItems()
                        : null,
                    style: TextStyle(
                      fontSize: 16.0,
                      color: Colors.white
                    ),
                    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(
                                    '${items.length}/${SeedWidgetState.maxLength}',
                                    style: TextStyle(
                                        color: PaletteDark.walletCardText,
                                        fontSize: 14)),
                                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:
                                          PaletteDark.menuList,
                                          borderRadius:
                                          BorderRadius.circular(10.0)),
                                      child: Text(
                                          S.of(context).paste,
                                          style: TextStyle(
                                            color: Colors.white
                                          ),
                                      )),
                                )
                              ],
                            ),
                          ),
                        ),
                        hintStyle:
                        TextStyle(
                          color: PaletteDark.walletCardText,
                          fontSize: 16
                        ),
                        hintText: S.of(context).restore_from_seed_placeholder,
                        errorText: _errorMessage,
                        focusedBorder: UnderlineInputBorder(
                            borderSide: BorderSide(
                                color: PaletteDark.menuList, width: 1.0)),
                        enabledBorder: UnderlineInputBorder(
                            borderSide: BorderSide(
                                color: PaletteDark.menuList,
                                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.red,
                      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: Colors.green,
                        textColor: Colors.white)
                        : PrimaryButton(
                        text: selectedItem != null
                            ? S.of(context).save
                            : S.of(context).add_new_word,
                        onPressed: () => isCurrentMnemoticValid
                            ? saveCurrentMnemoticToItems()
                            : null,
                        onDisabledPressed: () => showErrorIfExist(),
                        isDisabled: !isCurrentMnemoticValid,
                        color: Colors.green,
                        textColor: Colors.white),
                  ),
                )
              ],
            ))
      ]),
    );
  }
}