import 'dart:async';

import 'package:flutter/material.dart';

import '../../../../core/logging/logger.dart';
import '../../../../core/network/api_problem.dart';
import '../../../../core/network/api_problem_mapper.dart';
import '../../../../l10n/app_localizations.dart';
import '../../../../shared/theme/design_tokens.dart';
import '../../../../shared/widgets/toast/toast.dart';
import '../../../../shared/widgets/toast/toast_type.dart';
import '../widgets/settings_section_widgets.dart';

class AccountDeleteScreen extends StatefulWidget {
  const AccountDeleteScreen({super.key, required this.onDeleteAccount});

  final Future<void> Function() onDeleteAccount;

  @override
  State<AccountDeleteScreen> createState() => _AccountDeleteScreenState();
}

class _AccountDeleteScreenState extends State<AccountDeleteScreen> {
  final Logger _logger = getLogger('features.settings.account_delete');
  bool _isDeleting = false;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final colors = Theme.of(context).colorScheme;

    return Scaffold(
      backgroundColor: colors.surfaceContainerLow,
      appBar: AppBar(
        title: Text(l10n.settingsAccountAndDataTitle),
        centerTitle: true,
        backgroundColor: colors.surfaceContainerLow,
        surfaceTintColor: colors.surfaceContainerLow,
      ),
      body: ListView(
        padding: const EdgeInsets.all(AppSpacing.lg),
        children: [
          SettingsGroupCard(
            children: [
              SettingsMenuTile(
                icon: Icons.delete_outline_rounded,
                title: l10n.settingsDeleteAccountTitle,
                tint: colors.error,
                background: colors.surfaceContainerHighest,
                titleColor: colors.error,
                showDivider: false,
                onTap: _isDeleting ? () {} : _confirmDelete,
              ),
            ],
          ),
        ],
      ),
    );
  }

  Future<void> _confirmDelete() async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (dialogContext) {
        return const _DeleteConfirmDialog();
      },
    );
    if (confirmed != true || !mounted) {
      return;
    }
    await _deleteAccount();
  }

  Future<void> _deleteAccount() async {
    if (_isDeleting) {
      return;
    }
    setState(() {
      _isDeleting = true;
    });
    try {
      await widget.onDeleteAccount();
      if (!mounted) {
        return;
      }
      Navigator.of(context).pop(true);
    } catch (error, stackTrace) {
      _logger.error(
        message: 'Delete account request failed',
        error: error,
        stackTrace: stackTrace,
      );
      if (!mounted) {
        return;
      }
      final l10n = AppLocalizations.of(context)!;
      final message = error is ApiProblem
          ? mapApiProblemToMessage(error, l10n)
          : l10n.errorRequestGeneric;
      Toast.show(context, message, type: ToastType.error);
      setState(() {
        _isDeleting = false;
      });
    }
  }
}

class _DeleteConfirmDialog extends StatefulWidget {
  const _DeleteConfirmDialog();

  @override
  State<_DeleteConfirmDialog> createState() => _DeleteConfirmDialogState();
}

class _DeleteConfirmDialogState extends State<_DeleteConfirmDialog> {
  static const int _coolDownSeconds = 5;
  int _secondsLeft = _coolDownSeconds;
  Timer? _timer;

  @override
  void initState() {
    super.initState();
    _timer = Timer.periodic(const Duration(seconds: 1), (timer) {
      if (!mounted) {
        timer.cancel();
        return;
      }
      if (_secondsLeft <= 1) {
        setState(() {
          _secondsLeft = 0;
        });
        timer.cancel();
        return;
      }
      setState(() {
        _secondsLeft -= 1;
      });
    });
  }

  @override
  void dispose() {
    _timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final colors = Theme.of(context).colorScheme;

    return Dialog(
      insetPadding: const EdgeInsets.symmetric(
        horizontal: AppSpacing.lg,
        vertical: AppSpacing.xl,
      ),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(AppRadius.xl),
      ),
      child: Container(
        padding: const EdgeInsets.fromLTRB(
          AppSpacing.lg,
          AppSpacing.lg,
          AppSpacing.lg,
          AppSpacing.md,
        ),
        decoration: BoxDecoration(
          color: colors.surface,
          borderRadius: BorderRadius.circular(AppRadius.xl),
          border: Border.all(color: colors.outlineVariant),
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Container(
                  width: 36,
                  height: 36,
                  decoration: BoxDecoration(
                    color: colors.surfaceContainerHighest,
                    borderRadius: BorderRadius.circular(AppRadius.md),
                  ),
                  alignment: Alignment.center,
                  child: Icon(
                    Icons.warning_rounded,
                    color: colors.error,
                    size: 22,
                  ),
                ),
                const SizedBox(width: AppSpacing.sm),
                Expanded(
                  child: Text(
                    l10n.settingsDeleteAccountDialogTitle,
                    style: Theme.of(context).textTheme.titleLarge?.copyWith(
                      fontWeight: FontWeight.w700,
                    ),
                  ),
                ),
              ],
            ),
            const SizedBox(height: AppSpacing.md),
            Text(
              l10n.settingsDeleteAccountWarningBody,
              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                color: colors.onSurfaceVariant,
                height: 1.45,
              ),
            ),
            const SizedBox(height: AppSpacing.sm),
            Container(
              width: double.infinity,
              padding: const EdgeInsets.all(AppSpacing.md),
              decoration: BoxDecoration(
                color: colors.errorContainer,
                borderRadius: BorderRadius.circular(AppRadius.md),
                border: Border.all(color: colors.error.withValues(alpha: 0.35)),
              ),
              child: Text(
                l10n.settingsDeleteAccountReRegisterNotice,
                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                  color: colors.onErrorContainer,
                  fontWeight: FontWeight.w700,
                  height: 1.35,
                ),
              ),
            ),
            const SizedBox(height: AppSpacing.md),
            Text(
              _secondsLeft > 0
                  ? l10n.settingsDeleteAccountWaitAction(_secondsLeft)
                  : l10n.settingsDeleteAccountDialogBody,
              style: Theme.of(context).textTheme.bodySmall?.copyWith(
                color: colors.error,
                fontWeight: FontWeight.w600,
              ),
            ),
            const SizedBox(height: AppSpacing.lg),
            Row(
              children: [
                Expanded(
                  child: OutlinedButton(
                    onPressed: () => Navigator.of(context).pop(false),
                    style: OutlinedButton.styleFrom(
                      foregroundColor: colors.onSurface,
                      side: BorderSide(color: colors.outline),
                      minimumSize: const Size.fromHeight(44),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(AppRadius.full),
                      ),
                    ),
                    child: Text(l10n.settingsCancel),
                  ),
                ),
                const SizedBox(width: AppSpacing.sm),
                Expanded(
                  child: FilledButton(
                    onPressed: _secondsLeft <= 0
                        ? () => Navigator.of(context).pop(true)
                        : null,
                    style: FilledButton.styleFrom(
                      backgroundColor: colors.error,
                      foregroundColor: colors.onError,
                      disabledBackgroundColor: colors.error.withValues(
                        alpha: 0.4,
                      ),
                      disabledForegroundColor: colors.onError.withValues(
                        alpha: 0.8,
                      ),
                      minimumSize: const Size.fromHeight(44),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(AppRadius.full),
                      ),
                    ),
                    child: Text(l10n.settingsDeleteAccountAction),
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}