import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_mobx/flutter_mobx.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:warp_api/data_fb_generated.dart';
import 'package:warp_api/warp_api.dart';
import 'coin/coins.dart';
import 'generated/l10n.dart';
import 'main.dart';
import 'package:path/path.dart' as p;

import 'qrscanner.dart';

class ResetPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _ResetState();
}

class _ResetState extends State<ResetPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(title: Text('Emergency Menu')),
        body: Center(
            child: Padding(
                padding: EdgeInsets.all(16),
                child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      ElevatedButton(
                          onPressed: _onReset,
                          child: Text("TRUNCATE DB (Keeps accounts)")),
                      ElevatedButton(
                          onPressed: _onBackup,
                          child: Text("BACKUP ALL ACCOUNTS")),
                      ElevatedButton(
                          onPressed: _onRestore,
                          child: Text("RESTORE ALL ACCOUNTS")),
                    ]))));
  }

  _onReset() async {
    final s = S.of(context);
    final confirmation = await showDialog<bool>(
          context: context,
          barrierDismissible: false,
          builder: (context) => AlertDialog(
              title: Text(s.applicationReset),
              content: Text(s.confirmResetApp),
              actions: confirmButtons(context, () {
                Navigator.of(context).pop(true);
              }, okLabel: s.reset, cancelValue: false)),
        ) ??
        false;
    if (confirmation) {
      WarpApi.resetApp();
      final prefs = await SharedPreferences.getInstance();
      await prefs.clear();
      await showMessageBox(
          context, s.restart, s.pleaseQuitAndRestartTheAppNow, s.ok);
    }
  }

  _onBackup() {
    Navigator.of(context).pushNamed('/fullBackup');
  }

  _onRestore() {
    Navigator.of(context).pushNamed('/fullRestore');
  }
}

class FullBackupPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => FullBackupState();
}

class FullBackupState extends State<FullBackupPage> {
  final key = TextEditingController();

  @override
  Widget build(BuildContext context) {
    final s = S.of(context);
    return Observer(builder: (context) {
      key.text = settings.backupEncKey;
      return Scaffold(
          appBar: AppBar(title: Text(s.fullBackup)),
          body: Card(
              child: Column(children: [
            QRInput(s.backupEncryptionKey, key, hint: 'age'),
            Padding(padding: EdgeInsets.symmetric(vertical: 8)),
            ButtonBar(children: [
              ElevatedButton.icon(
                  onPressed: _onGenerate,
                  icon: Icon(Icons.key),
                  label: Text('Generate')),
              ElevatedButton.icon(
                  onPressed: () => _onSave(context),
                  icon: Icon(Icons.save),
                  label: Text(s.saveBackup))
            ])
          ])));
    });
  }

  _onSave(BuildContext context) async {
    if (key.text.isNotEmpty) {
      try {
        settings.setBackupEncKey(key.text);
        WarpApi.zipBackup(key.text, settings.tempDir);
        final backupPath = p.join(settings.tempDir, BACKUP_NAME);
        await exportFile(context, backupPath, BACKUP_NAME);
        Navigator.of(context).pop();
      } on String catch (msg) {
        showSnackBar(msg, error: true);
      }
    }
  }

  _onGenerate() async {
    final keys = WarpApi.generateKey();
    final navigator = Navigator.of(context);
    final state = GlobalKey<AGEKeysState>();
    final assign = await showDialog<bool?>(
            context: context,
            builder: (context) => AlertDialog(
                    contentPadding: EdgeInsets.all(16),
                    title: Text('Backup Keys'),
                    content: AGEKeysForm(keys, key: state),
                    actions: [
                      ElevatedButton.icon(
                          icon: Icon(Icons.cancel),
                          label: Text(S.current.cancel),
                          onPressed: () {
                            navigator.pop(null);
                          }),
                      ElevatedButton.icon(
                          icon: Icon(Icons.check),
                          label: Text(S.current.set),
                          onPressed: () {
                            navigator.pop(true);
                          })
                    ])) ??
        false;
    if (assign) settings.setBackupEncKey(state.currentState!.pk.text);
  }
}

class AGEKeysForm extends StatefulWidget {
  final Agekeys keys;
  AGEKeysForm(this.keys, {Key? key}) : super(key: key);

  @override
  State<StatefulWidget> createState() => AGEKeysState();
}

class AGEKeysState extends State<AGEKeysForm> {
  final pk = TextEditingController();
  final sk = TextEditingController();

  @override
  void initState() {
    super.initState();
    pk.text = widget.keys.pk!;
    sk.text = widget.keys.sk!;
  }

  @override
  Widget build(BuildContext context) {
    final s = S.of(context);
    return Form(
        child: SingleChildScrollView(
            child: Column(children: [
      QRDisplay(s.encryptionKey, widget.keys.pk!),
      QRDisplay(s.secretKey, widget.keys.sk!)
    ])));
  }
}

class FullRestorePage extends StatefulWidget {
  @override
  State<FullRestorePage> createState() => _FullRestoreState();
}

class _FullRestoreState extends State<FullRestorePage> {
  final controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    final s = S.of(context);
    return Scaffold(
        appBar: AppBar(title: Text(s.fullRestore)),
        body: Card(
            child: Column(children: [
          QRInput(s.secretKey, controller, hint: 'AGE-SECRET-KEY-'),
          Padding(padding: EdgeInsets.symmetric(vertical: 8)),
          ElevatedButton.icon(
              onPressed: _onLoad,
              icon: Icon(Icons.open_in_new),
              label: Text(s.loadBackup))
        ])));
  }

  _onLoad() async {
    final s = S.current;
    final result = await pickFile();

    if (result != null) {
      final filename = result.files.single.path!;
      final key = controller.text;
      try {
        if (key.isNotEmpty) {
          WarpApi.unzipBackup(key, filename, settings.tempDir);
        } else {
          final file = File(filename);
          final backup = await file.readAsString();
          WarpApi.importFromZWL(active.coin, "ZWL Imported Account", backup);
        }
        final prefs = await SharedPreferences.getInstance();
        await prefs.setBool('recover', true);
        showSnackBar(s.databaseRestored);
        await showRestartMessage(); // This doesn't return
      } on String catch (message) {
        showSnackBar(message, error: true);
      }
    }
  }
}

Future<void> showRestartMessage() async {
  final context = navigatorKey.currentContext!;
  await showDialog(
      context: context,
      barrierDismissible: false,
      builder: (context) => AlertDialog(
          content: Text(S.of(context).pleaseQuitAndRestartTheAppNow)));
}

Future<void> clearApp(BuildContext context) async {
  final reset = await showDialog<bool>(
          context: context,
          barrierDismissible: false,
          builder: (context) => AlertDialog(
                title: Text('Reset Database'),
                content: Text('Are you sure you want to DELETE ALL your data?'),
                actions: confirmButtons(
                    context, () => Navigator.of(context).pop(true)),
              )) ??
      false;
  if (reset) {
    final c = coins.first;
    File(c.dbDir).deleteSync(recursive: true);
  }
}