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

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

/// Reward celebration overlay.
///
/// Shows after a task is completed:
///  - Placeholder area for a Lottie animation.
///  - Points / magnitude display.
///  - Encouraging message.
///  - "Nice!" dismiss button.
///  - Surprise rewards get extra fanfare (larger, longer animation).
class RewardPopup extends StatelessWidget {
  final Reward reward;
  final VoidCallback onDismiss;

  const RewardPopup({
    super.key,
    required this.reward,
    required this.onDismiss,
  });

  /// Messages shown at random — always positive.
  static const _messages = [
    'You did it!',
    'Awesome work!',
    'One more down!',
    'Keep that momentum!',
    'Look at you go!',
    'Your brain thanks you!',
    'Small wins add up!',
    'That felt good, right?',
  ];

  String get _message {
    if (reward.description != null && reward.description!.isNotEmpty) {
      return reward.description!;
    }
    // Deterministic pick based on reward id hashCode so the same reward
    // always shows the same message during a session.
    return _messages[reward.id.hashCode.abs() % _messages.length];
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final isSurprise = reward.isSurprise;
    final size = isSurprise ? 140.0 : 100.0;

    return Center(
      child: Material(
        color: Colors.transparent,
        child: Container(
          margin: const EdgeInsets.symmetric(horizontal: 32),
          padding: const EdgeInsets.all(28),
          decoration: BoxDecoration(
            color: theme.colorScheme.surface,
            borderRadius: BorderRadius.circular(24),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withAlpha(40),
                blurRadius: 24,
                offset: const Offset(0, 8),
              ),
            ],
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              // ── Animation placeholder ────────────────────────────
              Container(
                width: size,
                height: size,
                decoration: BoxDecoration(
                  color: AppColors.rewardGold.withAlpha(40),
                  shape: BoxShape.circle,
                ),
                child: Icon(
                  isSurprise ? Icons.auto_awesome : Icons.celebration_rounded,
                  size: size * 0.5,
                  color: AppColors.rewardGold,
                ),
              ),
              const SizedBox(height: 20),

              // ── Title ────────────────────────────────────────────
              if (reward.title != null)
                Text(
                  reward.title!,
                  style: theme.textTheme.headlineSmall?.copyWith(
                    fontWeight: FontWeight.w700,
                  ),
                  textAlign: TextAlign.center,
                ),
              if (reward.title != null) const SizedBox(height: 8),

              // ── Points ───────────────────────────────────────────
              Text(
                '+${reward.magnitude} pts',
                style: theme.textTheme.titleLarge?.copyWith(
                  color: AppColors.rewardGoldDark,
                  fontWeight: FontWeight.w800,
                ),
              ),
              const SizedBox(height: 12),

              // ── Message ──────────────────────────────────────────
              Text(
                _message,
                style: theme.textTheme.bodyLarge,
                textAlign: TextAlign.center,
              ),
              const SizedBox(height: 24),

              // ── Dismiss ──────────────────────────────────────────
              FilledButton(
                onPressed: onDismiss,
                style: FilledButton.styleFrom(
                  backgroundColor: AppColors.primary,
                  minimumSize: const Size(160, 52),
                ),
                child: const Text('Nice!'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}