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

import '../core/constants.dart';
import '../data/models/note.dart';
import '../data/models/project.dart';
import '../data/models/task.dart';
import '../providers/tasks_provider.dart';

// ── Note card ────────────────────────────────────────────────────────────────

class NoteLibraryCard extends StatelessWidget {
  final Note note;
  const NoteLibraryCard({super.key, required this.note});

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Card(
      margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
      child: InkWell(
        onTap: () => context
            .push(Routes.noteDetail.replaceFirst(':id', '${note.id}')),
        borderRadius: BorderRadius.circular(14),
        child: Padding(
          padding: const EdgeInsets.fromLTRB(14, 12, 14, 12),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Icon(Icons.article_outlined,
                      size: 15, color: theme.colorScheme.onSurfaceVariant),
                  const SizedBox(width: 6),
                  Expanded(
                    child: Text(
                      note.title.isNotEmpty ? note.title : 'Untitled',
                      style: theme.textTheme.titleSmall,
                      maxLines: 1,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                  Text(
                    _relativeTime(note.updatedAt),
                    style: theme.textTheme.labelSmall?.copyWith(
                        color: theme.colorScheme.onSurfaceVariant),
                  ),
                ],
              ),
              if (note.body.isNotEmpty) ...[
                const SizedBox(height: 4),
                Text(
                  note.body.replaceAll('\n', ' '),
                  style: theme.textTheme.bodySmall?.copyWith(
                      color: theme.colorScheme.onSurfaceVariant),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                ),
              ],
              if (note.tags.isNotEmpty) ...[
                const SizedBox(height: 6),
                Wrap(
                  spacing: 4,
                  runSpacing: 2,
                  children: note.tags
                      .take(4)
                      .map((t) => Chip(
                            label: Text(t),
                            materialTapTargetSize:
                                MaterialTapTargetSize.shrinkWrap,
                            padding: EdgeInsets.zero,
                            visualDensity: VisualDensity.compact,
                          ))
                      .toList(),
                ),
              ],
            ],
          ),
        ),
      ),
    );
  }
}

// ── Task card ────────────────────────────────────────────────────────────────

class TaskLibraryCard extends ConsumerWidget {
  final Task task;
  const TaskLibraryCard({super.key, required this.task});

  Color _priorityColor(BuildContext context) {
    return switch (task.priority) {
      TaskPriority.high   => const Color(0xFFEF4444),
      TaskPriority.medium => const Color(0xFFF59E0B),
      _                   => Theme.of(context).colorScheme.onSurfaceVariant,
    };
  }

  IconData get _statusIcon => switch (task.status) {
        TaskStatus.done       => Icons.check_circle,
        TaskStatus.inProgress => Icons.timelapse,
        _                     => Icons.radio_button_unchecked,
      };

  Color _statusColor(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    return switch (task.status) {
      TaskStatus.done       => const Color(0xFF22C55E),
      TaskStatus.inProgress => cs.primary,
      _                     => cs.onSurfaceVariant,
    };
  }

  TaskStatus get _nextStatus => switch (task.status) {
        TaskStatus.todo       => TaskStatus.inProgress,
        TaskStatus.inProgress => TaskStatus.done,
        _                     => TaskStatus.todo,
      };

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final theme = Theme.of(context);
    return Card(
      margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
      child: InkWell(
        onTap: () => context
            .push(Routes.taskEdit.replaceFirst(':id', '${task.id}')),
        borderRadius: BorderRadius.circular(14),
        child: Padding(
          padding: const EdgeInsets.fromLTRB(8, 10, 14, 10),
          child: Row(
            children: [
              // Status cycle button
              IconButton(
                icon: Icon(_statusIcon, color: _statusColor(context)),
                onPressed: () => ref
                    .read(tasksProvider.notifier)
                    .updateTask(task.id, {'status': _nextStatus.value}),
                tooltip: 'Cycle status',
                visualDensity: VisualDensity.compact,
              ),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      task.title.isNotEmpty ? task.title : 'Untitled',
                      style: theme.textTheme.titleSmall?.copyWith(
                        decoration: task.status == TaskStatus.done
                            ? TextDecoration.lineThrough
                            : null,
                      ),
                      maxLines: 1,
                      overflow: TextOverflow.ellipsis,
                    ),
                    if (task.dueDate != null) ...[
                      const SizedBox(height: 2),
                      Text(
                        'Due ${_formatDate(task.dueDate!)}',
                        style: theme.textTheme.labelSmall?.copyWith(
                          color: task.dueDate!.isBefore(DateTime.now()) &&
                                  task.status != TaskStatus.done
                              ? const Color(0xFFEF4444)
                              : theme.colorScheme.onSurfaceVariant,
                        ),
                      ),
                    ],
                  ],
                ),
              ),
              if (task.priority != TaskPriority.none &&
                  task.priority != TaskPriority.low)
                Container(
                  width: 8,
                  height: 8,
                  decoration: BoxDecoration(
                    color: _priorityColor(context),
                    shape: BoxShape.circle,
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }
}

// ── Project card ─────────────────────────────────────────────────────────────

class ProjectLibraryCard extends StatelessWidget {
  final Project project;
  const ProjectLibraryCard({super.key, required this.project});

  Color _parseColor(String? hex) {
    if (hex == null || hex.isEmpty) return const Color(0xFF6366F1);
    try {
      return Color(int.parse(hex.replaceFirst('#', '0xFF')));
    } catch (_) {
      return const Color(0xFF6366F1);
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final color = _parseColor(project.color);
    return Card(
      margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        onTap: () => context
            .push('/projects/${project.id}/tasks'),
        borderRadius: BorderRadius.circular(14),
        child: Row(
          children: [
            // Colour strip
            Container(width: 6, height: 64, color: color),
            const SizedBox(width: 12),
            Expanded(
              child: Padding(
                padding: const EdgeInsets.symmetric(vertical: 12),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      project.title,
                      style: theme.textTheme.titleSmall,
                      maxLines: 1,
                      overflow: TextOverflow.ellipsis,
                    ),
                    if (project.description?.isNotEmpty == true) ...[
                      const SizedBox(height: 2),
                      Text(
                        project.description!,
                        style: theme.textTheme.bodySmall?.copyWith(
                            color: theme.colorScheme.onSurfaceVariant),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ],
                  ],
                ),
              ),
            ),
            const SizedBox(width: 12),
          ],
        ),
      ),
    );
  }
}

// ── Helpers ───────────────────────────────────────────────────────────────────

String _relativeTime(DateTime dt) {
  final diff = DateTime.now().difference(dt);
  if (diff.inMinutes < 1) return 'just now';
  if (diff.inHours < 1) return '${diff.inMinutes}m ago';
  if (diff.inDays < 1) return '${diff.inHours}h ago';
  if (diff.inDays < 7) return '${diff.inDays}d ago';
  return _formatDate(dt);
}

String _formatDate(DateTime dt) {
  const months = [
    'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
    'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
  ];
  return '${months[dt.month - 1]} ${dt.day}';
}