import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import 'package:household_keeper/core/database/database.dart';
import 'package:household_keeper/features/tasks/domain/frequency.dart';
import 'package:household_keeper/features/tasks/domain/relative_date.dart';
import 'package:household_keeper/features/tasks/presentation/task_providers.dart';

/// Warm coral/terracotta color for overdue due date text.
const _overdueColor = Color(0xFFE07A5F);

/// A single task row with leading checkbox, name, relative due date,
/// and frequency label.
///
/// Per user decisions:
/// - Checkbox marks task done immediately (optimistic UI, no undo)
/// - Row tap opens edit form
/// - No swipe gesture
/// - No effort indicator or description preview on list view
/// - Overdue: due date text turns warm coral, rest stays normal
class TaskRow extends ConsumerWidget {
  const TaskRow({
    super.key,
    required this.task,
    this.onDelete,
  });

  final Task task;
  final VoidCallback? onDelete;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final theme = Theme.of(context);
    final now = DateTime.now();
    final today = DateTime(now.year, now.month, now.day);

    // Check if task is overdue (due date is before today)
    final dueDate = DateTime(
      task.nextDueDate.year,
      task.nextDueDate.month,
      task.nextDueDate.day,
    );
    final isOverdue = dueDate.isBefore(today);
    final isFuture = dueDate.isAfter(today);

    // Format relative due date in German
    final relativeDateText = formatRelativeDate(task.nextDueDate, now);

    // Build frequency label
    final freq = FrequencyInterval(
      intervalType: task.intervalType,
      days: task.intervalDays,
    );
    final frequencyText = freq.label();

    return ListTile(
      leading: Checkbox(
        value: false, // Always unchecked -- completion is immediate + reschedule
        onChanged: isFuture
            ? null // Future tasks cannot be completed yet
            : (_) {
                // Mark done immediately (optimistic UI, no undo per user decision)
                ref.read(taskActionsProvider.notifier).completeTask(task.id);
              },
      ),
      title: Text(
        task.name,
        style: theme.textTheme.titleMedium,
        maxLines: 1,
        overflow: TextOverflow.ellipsis,
      ),
      subtitle: Row(
        children: [
          Text(
            relativeDateText,
            style: theme.textTheme.bodySmall?.copyWith(
              color: isOverdue ? _overdueColor : theme.colorScheme.onSurfaceVariant,
            ),
          ),
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 6),
            child: Text(
              '\u00b7', // middle dot separator
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
            ),
          ),
          Flexible(
            child: Text(
              frequencyText,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurfaceVariant,
              ),
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
            ),
          ),
        ],
      ),
      onTap: () {
        // Tap row opens edit form
        context.go('/rooms/${task.roomId}/tasks/${task.id}');
      },
      onLongPress: onDelete,
    );
  }
}