import 'package:flutter/material.dart';
import 'package:focusflow_shared/focusflow_shared.dart';

import '../theme/app_colors.dart';

/// ADHD-friendly task card.
///
/// Design principles:
///  - Large title text for scannability.
///  - Energy level indicator (colored dot).
///  - Estimated time badge.
///  - Tags as small chips.
///  - Gentle color coding — NO overwhelming information density.
///  - Tap to open, long-press for quick actions.
class TaskCard extends StatelessWidget {
  final Task task;
  final VoidCallback? onTap;
  final VoidCallback? onComplete;
  final VoidCallback? onSkip;

  const TaskCard({
    super.key,
    required this.task,
    this.onTap,
    this.onComplete,
    this.onSkip,
  });

  Color _energyColor() {
    switch (task.energyLevel) {
      case 'low':
        return AppColors.energyLow;
      case 'high':
        return AppColors.energyHigh;
      default:
        return AppColors.energyMedium;
    }
  }

  String _energyLabel() {
    switch (task.energyLevel) {
      case 'low':
        return 'Low';
      case 'high':
        return 'High';
      default:
        return 'Med';
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Card(
      child: InkWell(
        borderRadius: BorderRadius.circular(16),
        onTap: onTap,
        onLongPress: () => _showQuickActions(context),
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // ── Top row: title + energy dot ─────────────────────
              Row(
                children: [
                  // Energy dot
                  Container(
                    width: 12,
                    height: 12,
                    decoration: BoxDecoration(
                      color: _energyColor(),
                      shape: BoxShape.circle,
                    ),
                  ),
                  const SizedBox(width: 10),

                  // Title
                  Expanded(
                    child: Text(
                      task.title,
                      style: theme.textTheme.titleMedium?.copyWith(
                        fontSize: 18,
                        fontWeight: FontWeight.w600,
                      ),
                      maxLines: 2,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                ],
              ),

              if (task.description != null && task.description!.isNotEmpty) ...[
                const SizedBox(height: 6),
                Text(
                  task.description!,
                  style: theme.textTheme.bodyMedium,
                  maxLines: 2,
                  overflow: TextOverflow.ellipsis,
                ),
              ],

              const SizedBox(height: 12),

              // ── Bottom row: badges & tags ──────────────────────
              Wrap(
                spacing: 8,
                runSpacing: 6,
                children: [
                  // Energy badge
                  _Badge(
                    icon: Icons.bolt_rounded,
                    label: _energyLabel(),
                    color: _energyColor(),
                  ),

                  // Estimated time
                  if (task.estimatedMinutes != null)
                    _Badge(
                      icon: Icons.timer_outlined,
                      label: '${task.estimatedMinutes} min',
                      color: AppColors.primary,
                    ),

                  // Category
                  if (task.category != null)
                    _Badge(
                      icon: Icons.label_outline,
                      label: task.category!,
                      color: AppColors.tertiary,
                    ),

                  // Tags
                  ...task.tags.take(3).map((tag) => Chip(
                        label: Text(tag, style: const TextStyle(fontSize: 11)),
                        materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
                        visualDensity: VisualDensity.compact,
                        padding: EdgeInsets.zero,
                      )),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }

  void _showQuickActions(BuildContext context) {
    showModalBottomSheet(
      context: context,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
      ),
      builder: (ctx) => SafeArea(
        child: Padding(
          padding: const EdgeInsets.symmetric(vertical: 16),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              ListTile(
                leading: const Icon(Icons.check_circle_outline, color: AppColors.completed),
                title: const Text('Mark as done'),
                onTap: () {
                  Navigator.pop(ctx);
                  onComplete?.call();
                },
              ),
              ListTile(
                leading: const Icon(Icons.skip_next_outlined, color: AppColors.skipped),
                title: const Text('Skip for now'),
                onTap: () {
                  Navigator.pop(ctx);
                  onSkip?.call();
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
}

/// Small coloured badge used inside [TaskCard].
class _Badge extends StatelessWidget {
  final IconData icon;
  final String label;
  final Color color;

  const _Badge({required this.icon, required this.label, required this.color});

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
      decoration: BoxDecoration(
        color: color.withAlpha(30),
        borderRadius: BorderRadius.circular(12),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(icon, size: 14, color: color),
          const SizedBox(width: 4),
          Text(
            label,
            style: TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: color),
          ),
        ],
      ),
    );
  }
}