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),
        )
      ],
    );
  }
}