import 'package:flutter/material.dart';
import 'package:outbag_app/backend/crypto.dart';
import 'package:outbag_app/backend/request.dart';
import 'package:outbag_app/backend/user.dart';
import 'package:outbag_app/tools/fetch_wrapper.dart';
import 'package:outbag_app/tools/snackbar.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:provider/provider.dart';

class ChangePasswordDialog extends StatefulWidget {
  const ChangePasswordDialog({super.key});

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

class _ChangePasswordDialogState extends State<ChangePasswordDialog> {
  final TextEditingController _ctrOldPassword = TextEditingController();
  final TextEditingController _ctrNewPassword = TextEditingController();
  final TextEditingController _ctrNewPasswordRepeat = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(AppLocalizations.of(context)!.changeThemeTitle),
      icon: const Icon(Icons.password),
      content: SingleChildScrollView(
        child: Column(
          children: [
            Padding(
              padding: const EdgeInsets.all(8),
              child: TextField(
                controller: _ctrOldPassword,
                keyboardType: TextInputType.visiblePassword,
                obscureText: true,
                decoration: InputDecoration(
                  prefixIcon: const Icon(Icons.lock),
                  labelText: AppLocalizations.of(context)!.inputOldPasswordLabel,
                  hintText: AppLocalizations.of(context)!.inputOldPasswordHint,
                  helperText:AppLocalizations.of(context)!.inputOldPasswordHelp,
                  border: const OutlineInputBorder(),
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(8),
              child: TextField(
                controller: _ctrNewPassword,
                keyboardType: TextInputType.visiblePassword,
                obscureText: true,
                decoration: InputDecoration(
                  prefixIcon: const Icon(Icons.lock),
                  labelText: AppLocalizations.of(context)!.inputNewPasswordLabel,
                  hintText: AppLocalizations.of(context)!.inputNewPasswordHint,
                  helperText:AppLocalizations.of(context)!.inputNewPasswordHelp,
                  border: const OutlineInputBorder(),
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(8),
              child: TextField(
                controller: _ctrNewPasswordRepeat,
                keyboardType: TextInputType.visiblePassword,
                obscureText: true,
                decoration: InputDecoration(
                  prefixIcon: const Icon(Icons.lock),
                  labelText: AppLocalizations.of(context)!.inputNewPasswordRepeatLabel,
                  hintText: AppLocalizations.of(context)!.inputNewPasswordRepeatHint,
                  helperText:AppLocalizations.of(context)!.inputNewPasswordRepeatHelp,
                  border: const OutlineInputBorder(),
                ),
              ),
            ),
          ],
      )),
      actions: [
        TextButton(
          onPressed: () {
            // close popup
            Navigator.of(context).pop();
          },
          child: Text(AppLocalizations.of(context)!.cancel),
        ),
        FilledButton(
          onPressed: () async {
            final scaffMgr = ScaffoldMessenger.of(context);
            final nav = Navigator.of(context);
            final user = context.read<User>();
            final trans = AppLocalizations.of(context);

            // validate password
            if (_ctrNewPassword.text.length < 6) {
              // password has to be at least 6 characters long
              showSimpleSnackbar(scaffMgr,
                text: trans!.errorPasswordLength,
                action: trans.dismiss);

              _ctrNewPasswordRepeat.clear();
              return;
            }
            if (_ctrNewPassword.text != _ctrNewPasswordRepeat.text) {
              // new passwords do not match
              showSimpleSnackbar(scaffMgr,
                text: trans!.errorPasswordsDoNotMatch, action: trans.dismiss);

              _ctrNewPasswordRepeat.clear();
              return;
            }
            if (hashPassword(_ctrOldPassword.text) != user.password) {
              // current password wrong
              showSimpleSnackbar(scaffMgr,
                text: trans!.errorOldPasswordWrong, action: trans.dismiss);

              _ctrOldPassword.clear();
              return;
            }

            final password = hashPassword(_ctrNewPassword.text);

            // send request
            doNetworkRequest(scaffMgr,
              req: () => postWithCreadentials(
                path: 'changePassword',
                target: user.server,
                body: {'accountKey': password},
                credentials: user),
              onOK: (_) async {
                // update local user struct
                final updatedUser = User(
                  username: user.username,
                  password: password,
                  server: user.server);
                await updatedUser.toDisk();
              },
              after: () {
                // close popup
                nav.pop();
            });
          },
          child: Text(AppLocalizations.of(context)!.changeThemeTitle),
        )
      ],
    );
  }
}