import 'dart:async';
import 'dart:io';

import 'package:currency_picker/currency_picker.dart';
import 'package:dynamic_color/dynamic_color.dart';
import 'package:flex_color_picker/flex_color_picker.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:flutter_iconpicker/flutter_iconpicker.dart';
import 'package:introduction_screen/introduction_screen.dart';
import 'package:prasule/api/category.dart';
import 'package:prasule/api/wallet.dart';
import 'package:prasule/api/wallet_manager.dart';
import 'package:prasule/pw/platformbutton.dart';
import 'package:prasule/pw/platformfield.dart';
import 'package:prasule/pw/platformroute.dart';
import 'package:prasule/util/show_message.dart';
import 'package:prasule/util/text_color.dart';
import 'package:prasule/util/utils.dart';
import 'package:prasule/views/home.dart';
import 'package:shared_preferences/shared_preferences.dart';

/// View that shows on first-time setup
class SetupView extends StatefulWidget {
  /// View that shows on first-time setup
  const SetupView({super.key, this.newWallet = false});

  /// We are only creating a new wallet, no first-time setup
  final bool newWallet;
  @override
  State<SetupView> createState() => _SetupViewState();
}

class _SetupViewState extends State<SetupView> {
  var _selectedCurrency = Currency.from(
    json: {
      "code": "USD",
      "name": "United States Dollar",
      "symbol": r"$",
      "flag": "USD",
      "decimal_digits": 2,
      "number": 840,
      "name_plural": "US dollars",
      "thousands_separator": ",",
      "decimal_separator": ".",
      "space_between_amount_and_symbol": false,
      "symbol_on_left": true,
    },
  );
  List<WalletCategory> categories = <WalletCategory>[];
  final _nameController = TextEditingController();
  final _balanceController = TextEditingController(text: "0.0");

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (categories.isNotEmpty) return;
    _nameController.text = AppLocalizations.of(context).setupNamePlaceholder;
    categories = [
      WalletCategory(
        name: AppLocalizations.of(context).noCategory,
        id: 0,
        icon: IconData(
          Icons.payments.codePoint,
          fontFamily: 'MaterialIcons',
        ),
        color: Theme.of(context).colorScheme.secondary,
      ),
      WalletCategory(
        name: AppLocalizations.of(context).categoryHealth,
        id: 1,
        icon: IconData(
          Icons.medical_information.codePoint,
          fontFamily: 'MaterialIcons',
        ),
        color: Colors.red.shade700
            .harmonizeWith(Theme.of(context).colorScheme.primary),
      ),
      WalletCategory(
        name: AppLocalizations.of(context).categoryCar,
        id: 2,
        icon: IconData(Icons.car_repair.codePoint, fontFamily: 'MaterialIcons'),
        color:
            Colors.purple.harmonizeWith(Theme.of(context).colorScheme.primary),
      ),
      WalletCategory(
        name: AppLocalizations.of(context).categoryFood,
        id: 3,
        icon: IconData(Icons.restaurant.codePoint, fontFamily: 'MaterialIcons'),
        color: Colors.green.shade700
            .harmonizeWith(Theme.of(context).colorScheme.primary),
      ),
      WalletCategory(
        name: AppLocalizations.of(context).categoryTravel,
        id: 4,
        icon: IconData(Icons.train.codePoint, fontFamily: 'MaterialIcons'),
        color: Colors.orange.shade700
            .harmonizeWith(Theme.of(context).colorScheme.primary),
      ),
    ];
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(AppLocalizations.of(context).setup),
        actions: [
          Tooltip(
            message: AppLocalizations.of(context).about,
            child: IconButton(
              onPressed: () {
                showAbout(context);
              },
              icon: const Icon(Icons.info_outline),
            ),
          ),
        ],
      ),
      body: Center(
        child: SizedBox(
          width: MediaQuery.of(context).size.width,
          height: MediaQuery.of(context).size.height,
          child: IntroductionScreen(
            dotsDecorator: DotsDecorator(
              activeColor: Theme.of(context).colorScheme.primary,
            ),
            showBackButton: true,
            next: Text(AppLocalizations.of(context).next),
            back: Text(AppLocalizations.of(context).back),
            done: Text(AppLocalizations.of(context).finish),
            onDone: () async {
              if (_nameController.text.isEmpty) {
                unawaited(
                  showMessage(
                    AppLocalizations.of(context).errorEmptyName,
                    context,
                  ),
                );
                return;
              }
              if (await WalletManager.exists(_nameController.text) &&
                  context.mounted) {
                unawaited(
                  showMessage(
                    AppLocalizations.of(context).walletExists,
                    context,
                  ),
                );
                return;
              }
              final wallet = Wallet(
                name: _nameController.text,
                currency: _selectedCurrency,
                categories: categories,
                starterBalance: double.parse(_balanceController.text),
              );
              await WalletManager.saveWallet(wallet);

              if (widget.newWallet && context.mounted) {
                Navigator.of(context).pop();
                return;
              }
              if (!context.mounted) return;
              unawaited(
                Navigator.of(context).pushReplacement(
                  platformRoute(
                    (c) => const HomeView(),
                  ),
                ),
              );
            },
            pages: [
              PageViewModel(
                decoration:
                    const PageDecoration(bodyAlignment: Alignment.center),
                titleWidget: Padding(
                  padding: const EdgeInsets.all(8),
                  child: Text(
                    AppLocalizations.of(context).welcome,
                    style: const TextStyle(
                      fontSize: 24,
                      fontWeight: FontWeight.bold,
                    ),
                    textAlign: TextAlign.center,
                  ),
                ),
                bodyWidget: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    if (!widget.newWallet)
                      Flexible(
                        child: Text(
                          AppLocalizations.of(context).welcomeAboutPrasule,
                          textAlign: TextAlign.center,
                        ),
                      ),
                    if (!widget.newWallet)
                      const SizedBox(
                        height: 8,
                      ),
                    Flexible(
                      child: Text(
                        AppLocalizations.of(context).welcomeInstruction,
                        textAlign: TextAlign.center,
                      ),
                    ),
                  ],
                ),
              ),
              PageViewModel(
                decoration:
                    const PageDecoration(bodyAlignment: Alignment.center),
                titleWidget: Padding(
                  padding: const EdgeInsets.all(8),
                  child: Text(
                    AppLocalizations.of(context).setupWalletNameCurrency,
                    textAlign: TextAlign.center,
                    style: const TextStyle(
                      fontSize: 24,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                bodyWidget: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    SizedBox(
                      width: MediaQuery.of(context).size.width * 0.7,
                      child: PlatformField(controller: _nameController),
                    ),
                    const SizedBox(
                      height: 5,
                    ),
                    PlatformButton(
                      text: AppLocalizations.of(context)
                          .setupCurrency(_selectedCurrency.code),
                      onPressed: () {
                        showCurrencyPicker(
                          context: context,
                          onSelect: (currency) {
                            _selectedCurrency = currency;
                            setState(() {});
                          },
                        );
                      },
                    ),
                    const SizedBox(
                      height: 5,
                    ),
                    SizedBox(
                      width: MediaQuery.of(context).size.width * 0.7,
                      child: PlatformField(
                        labelText:
                            AppLocalizations.of(context).setupStartingBalance,
                        keyboardType: const TextInputType.numberWithOptions(
                          decimal: true,
                        ),
                        controller: _balanceController,
                        inputFormatters: [
                          FilteringTextInputFormatter.allow(
                            RegExp(r'\d+[\.,]{0,1}\d{0,}'),
                          ),
                        ],
                        prefix: Padding(
                          padding: const EdgeInsets.only(right: 4),
                          child: Text(_selectedCurrency.symbol),
                        ),
                      ),
                    ),
                  ],
                ),
              ),
              PageViewModel(
                decoration:
                    const PageDecoration(bodyAlignment: Alignment.center),
                titleWidget: Padding(
                  padding: const EdgeInsets.all(8),
                  child: Text(
                    AppLocalizations.of(context).setupCategoriesHeading,
                    textAlign: TextAlign.center,
                    style: const TextStyle(
                      fontSize: 24,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                bodyWidget: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Text(
                      AppLocalizations.of(context).setupCategoriesEditHint,
                      textAlign: TextAlign.center,
                    ),
                    IconButton(
                      onPressed: () {
                        var id = 0;
                        while (categories
                            .where((element) => element.id == id)
                            .isNotEmpty) {
                          id++; // create unique ID
                        }
                        categories.add(
                          WalletCategory(
                            name: AppLocalizations.of(context)
                                .setupWalletNamePlaceholder,
                            id: id,
                            icon: IconData(
                              Icons.question_mark.codePoint,
                              fontFamily: 'MaterialIcons',
                            ),
                            color: Colors.blueGrey.harmonizeWith(
                              Theme.of(context).colorScheme.primary,
                            ),
                          ),
                        );
                        setState(() {});
                      },
                      icon: const Icon(Icons.add),
                    ),
                    SizedBox(
                      height: MediaQuery.of(context).size.height * 0.64,
                      child: ListView.builder(
                        shrinkWrap: true,
                        itemBuilder: (context, i) => (i == 0)
                            ? const SizedBox()
                            : ListTile(
                                leading: GestureDetector(
                                  onTap: () async {
                                    final icon = await showIconPicker(
                                      context,
                                      iconPackModes: [
                                        if (!Platform.isIOS &&
                                            !Platform.isMacOS)
                                          IconPack.material,
                                        if (Platform.isIOS || Platform.isMacOS)
                                          IconPack.cupertino,
                                      ],
                                      // adaptiveDialog: true,
                                    );
                                    if (icon != null) categories[i].icon = icon;
                                    final materialEnabled =
                                        (await SharedPreferences.getInstance())
                                                .getBool("useMaterialYou") ??
                                            false;
                                    if (!context.mounted) return;
                                    await showAdaptiveDialog<void>(
                                      context: context,
                                      builder: (c) => AlertDialog.adaptive(
                                        actions: [
                                          PlatformButton(
                                            text: AppLocalizations.of(context)
                                                .done,
                                            onPressed: () {
                                              Navigator.of(c).pop();
                                            },
                                          ),
                                        ],
                                        title: Text(
                                          AppLocalizations.of(context)
                                              .pickColor,
                                        ),
                                        content: Column(
                                          children: [
                                            ColorPicker(
                                              pickersEnabled: {
                                                ColorPickerType.wheel: true,
                                                ColorPickerType.primary: false,
                                                ColorPickerType.custom: false,
                                                ColorPickerType.bw: false,
                                                ColorPickerType.accent:
                                                    materialEnabled,
                                              },
                                              color: categories[i].color,
                                              onColorChanged: (color) {
                                                categories[i].color = color;
                                                setState(() {});
                                              },
                                            ),
                                          ],
                                        ),
                                      ),
                                    );
                                    setState(() {});
                                  },
                                  child: Container(
                                    decoration: BoxDecoration(
                                      borderRadius: BorderRadius.circular(16),
                                      color: categories[i].color,
                                    ),
                                    child: Padding(
                                      padding: const EdgeInsets.all(8),
                                      child: Icon(
                                        categories[i].icon,
                                        color: categories[i]
                                            .color
                                            .calculateTextColor(),
                                      ),
                                    ),
                                  ),
                                ),
                                trailing: IconButton(
                                  icon: const Icon(Icons.cancel),
                                  onPressed: () {
                                    categories.removeAt(i);
                                    setState(() {});
                                  },
                                ),
                                title: GestureDetector(
                                  onTap: () {
                                    final controller = TextEditingController(
                                      text: categories[i].name,
                                    );
                                    showAdaptiveDialog<void>(
                                      context: context,
                                      builder: (c) => AlertDialog.adaptive(
                                        actions: [
                                          TextButton(
                                            onPressed: () {
                                              if (controller.text.isEmpty) {
                                                return;
                                              }
                                              categories[i].name =
                                                  controller.text;
                                              Navigator.of(context).pop();
                                            },
                                            child: Text(
                                              AppLocalizations.of(context).ok,
                                            ),
                                          ),
                                          TextButton(
                                            onPressed: () {
                                              Navigator.of(context).pop();
                                            },
                                            child: Text(
                                              AppLocalizations.of(context)
                                                  .cancel,
                                            ),
                                          ),
                                        ],
                                        title: Text(
                                          AppLocalizations.of(context)
                                              .setupCategoriesEditingName,
                                        ),
                                        content: SizedBox(
                                          width: 400,
                                          child: PlatformField(
                                            controller: controller,
                                          ),
                                        ),
                                      ),
                                    );
                                  },
                                  child: Text(
                                    categories[i].name,
                                    style: const TextStyle(
                                      fontWeight: FontWeight.bold,
                                    ),
                                  ),
                                ),
                              ),
                        itemCount: categories.length,
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}