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

import 'package:timetrack/features/projects/domain/project.dart';
import 'package:timetrack/features/timer/domain/frequent_projects_provider.dart';
import 'package:timetrack/features/timer/domain/timer_notifier.dart';
import 'package:timetrack/features/timer/domain/timer_state.dart';

class QuickAccessGrid extends ConsumerWidget {
  const QuickAccessGrid({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final projects = ref.watch(frequentProjectsProvider);
    if (projects.isEmpty) return const SizedBox.shrink();

    final timerState = ref.watch(timerNotifierProvider);
    final runningProject =
        timerState is TimerRunning ? timerState.project : null;

    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'Quick Access',
            style: Theme.of(context).textTheme.labelSmall?.copyWith(
                  color: Theme.of(context).colorScheme.onSurfaceVariant,
                  letterSpacing: 0.8,
                ),
          ),
          const SizedBox(height: 8),
          Wrap(
            spacing: 8,
            runSpacing: 8,
            children: projects.map((project) {
              return _ProjectChip(
                project: project,
                isRunning: runningProject?.id == project.id,
                onTap: () => _onChipTap(context, ref, project, runningProject),
              );
            }).toList(),
          ),
        ],
      ),
    );
  }

  Future<void> _onChipTap(
    BuildContext context,
    WidgetRef ref,
    Project tapped,
    Project? runningProject,
  ) async {
    final notifier = ref.read(timerNotifierProvider.notifier);

    if (runningProject?.id == tapped.id) {
      // Toggle: stop the running timer
      await notifier.stop();
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('${tapped.name} gestoppt'),
            duration: const Duration(seconds: 2),
          ),
        );
      }
    } else if (runningProject != null) {
      // Switch: stop old, start new
      final stoppedName = runningProject.name;
      await notifier.start(tapped);
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('$stoppedName gestoppt, ${tapped.name} gestartet'),
            duration: const Duration(seconds: 2),
          ),
        );
      }
    } else {
      // Start fresh
      await notifier.start(tapped);
    }
  }
}

class _ProjectChip extends StatelessWidget {
  const _ProjectChip({
    required this.project,
    required this.isRunning,
    required this.onTap,
  });

  final Project project;
  final bool isRunning;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final projectColor = Color(project.colorValue);
    final colorScheme = Theme.of(context).colorScheme;

    final backgroundColor = isRunning
        ? projectColor.withValues(alpha: 0.15)
        : colorScheme.surfaceContainerHighest;

    final borderColor = isRunning ? projectColor : Colors.transparent;

    return InkWell(
      onTap: onTap,
      borderRadius: BorderRadius.circular(20),
      child: AnimatedContainer(
        duration: const Duration(milliseconds: 200),
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        decoration: BoxDecoration(
          color: backgroundColor,
          borderRadius: BorderRadius.circular(20),
          border: Border.all(
            color: borderColor,
            width: isRunning ? 2 : 0,
          ),
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              width: 10,
              height: 10,
              decoration: BoxDecoration(
                color: projectColor,
                shape: BoxShape.circle,
              ),
            ),
            const SizedBox(width: 6),
            ConstrainedBox(
              constraints: const BoxConstraints(maxWidth: 120),
              child: Text(
                project.name,
                style: Theme.of(context).textTheme.bodySmall?.copyWith(
                      fontWeight:
                          isRunning ? FontWeight.w600 : FontWeight.normal,
                      color: isRunning
                          ? projectColor
                          : colorScheme.onSurfaceVariant,
                    ),
                overflow: TextOverflow.ellipsis,
                maxLines: 1,
              ),
            ),
          ],
        ),
      ),
    );
  }
}