import 'package:flutter/material.dart';
import 'package:flutter_animate/flutter_animate.dart';
import 'package:lucide_icons/lucide_icons.dart';
import 'package:go_router/go_router.dart';
import '../../data/mock_data.dart';
import '../../models/character.dart';
import '../../widgets/tab_content_layout.dart';

class DiscoveryScreen extends StatefulWidget {
  const DiscoveryScreen({super.key});

  @override
  State<DiscoveryScreen> createState() => _DiscoveryScreenState();
}

class _DiscoveryScreenState extends State<DiscoveryScreen> {
  String _activeFilter = 'all';

  final List<Map<String, String>> _filters = [
    {'id': 'all', 'label': '全部'},
    {'id': 'gentle', 'label': '温柔治愈'},
    {'id': 'dom', 'label': '主导强势'},
    {'id': 'wild', 'label': '反差/猎奇'},
    {'id': 'voice', 'label': '语音陪聊'},
    {'id': 'scenario', 'label': '场景扮演'},
    {'id': 'exclusive', 'label': '会员限定'},
  ];

  List<Character> get _filteredCharacters {
    if (_activeFilter == 'all') return mockCharacters;
    return mockCharacters.where((c) {
      final tags = c.tags.join('');
      if (_activeFilter == 'gentle') return tags.contains('治愈') || tags.contains('温顺') || tags.contains('医疗');
      if (_activeFilter == 'dom') return tags.contains('强势') || tags.contains('调教') || tags.contains('指令');
      if (_activeFilter == 'wild') return tags.contains('病娇') || tags.contains('神秘') || tags.contains('不稳定') || tags.contains('极乐');
      if (_activeFilter == 'exclusive') return c.isLocked;
      return false;
    }).toList();
  }

  @override
  Widget build(BuildContext context) {
    const double bottomNavHeight = 90; 

    return TabContentLayout(
      child: Column(
      children: [
        // 1. Sticky Filter Bar (simulated)
        SizedBox(
          height: 50,
          child: ListView.separated(
            padding: const EdgeInsets.symmetric(horizontal: 16),
            scrollDirection: Axis.horizontal,
            itemCount: _filters.length,
            separatorBuilder: (_, __) => const SizedBox(width: 12),
            itemBuilder: (context, index) {
              final filter = _filters[index];
              final isActive = _activeFilter == filter['id'];
              return Center(
                child: GestureDetector(
                  onTap: () => setState(() => _activeFilter = filter['id']!),
                  child: AnimatedContainer(
                    duration: const Duration(milliseconds: 300),
                    padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
                    decoration: BoxDecoration(
                      color: isActive ? Colors.white : Colors.white.withOpacity(0.05),
                      borderRadius: BorderRadius.circular(20),
                      border: Border.all(
                        color: isActive ? Colors.white : Colors.white.withOpacity(0.1),
                      ),
                    ),
                    child: Text(
                      filter['label']!,
                      style: TextStyle(
                        fontSize: 14,
                        fontWeight: isActive ? FontWeight.bold : FontWeight.normal,
                        color: isActive ? const Color(0xFF2E1065) : Colors.white.withOpacity(0.7),
                      ),
                    ),
                  ),
                ),
              );
            },
          ),
        ),

        // 2. Grid Layout
        Expanded(
          child: _filteredCharacters.isEmpty
              ? Center(child: Text('暂无匹配角色', style: TextStyle(color: Colors.white.withOpacity(0.5))))
              : GridView.builder(
                  padding: const EdgeInsets.fromLTRB(16, 16, 16, bottomNavHeight + 20),
                  gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                    crossAxisCount: 2,
                    childAspectRatio: 3 / 4,
                    crossAxisSpacing: 16,
                    mainAxisSpacing: 16,
                  ),
                  itemCount: _filteredCharacters.length,
                  itemBuilder: (context, index) {
                    final char = _filteredCharacters[index];
                    return _CharacterCard(
                        character: char,
                        onTap: () {
                           if (!char.isLocked) {
                              context.push('/interaction/${char.id}');
                           }
                        },
                    )
                    .animate()
                    .fadeIn(duration: 400.ms, delay: (index * 100).ms)
                    .scale(begin: const Offset(0.9, 0.9));
                  },
                ),
        ),
      ],
    ),
    );
  }
}

class _CharacterCard extends StatelessWidget {
  final Character character;
  final VoidCallback onTap;

  const _CharacterCard({
    required this.character,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(24),
          boxShadow: [
            BoxShadow(
              color: Colors.black.withOpacity(0.3),
              blurRadius: 15,
              offset: const Offset(0, 6),
            ),
            BoxShadow(
              color: const Color(0xFFA855F7).withOpacity(0.1),
              blurRadius: 20,
              offset: const Offset(0, 0),
            ),
          ],
        ),
        child: Stack(
          fit: StackFit.expand,
          children: [
            // Clipped content area - ensures all elements respect border radius
            ClipRRect(
              borderRadius: BorderRadius.circular(24),
              child: Stack(
                fit: StackFit.expand,
                children: [
                  // Background Image
                  Image.network(
                    character.avatar,
                    fit: BoxFit.cover,
                    loadingBuilder: (context, child, loadingProgress) {
                      if (loadingProgress == null) return child;
                      return Container(
                        color: Colors.black26,
                        child: const Center(child: CircularProgressIndicator(strokeWidth: 2)),
                      );
                    },
                  ),
        
                  // Gradient Overlay
                  Container(
                    decoration: const BoxDecoration(
                      gradient: LinearGradient(
                        begin: Alignment.topCenter,
                        end: Alignment.bottomCenter,
                        colors: [
                          Colors.transparent,
                          Colors.transparent,
                          Color(0xFF2E1065), // Deep purple at bottom
                        ],
                        stops: [0.0, 0.5, 1.0],
                      ),
                    ),
                  ),
        
                  // Top Left: Popularity/Compatibility Badge
                  if (!character.isLocked)
                    Positioned(
                      top: 12,
                      left: 12,
                      child: Container(
                        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                        decoration: BoxDecoration(
                          color: Colors.black.withOpacity(0.4),
                          borderRadius: BorderRadius.circular(12),
                          border: Border.all(color: Colors.white.withOpacity(0.1)),
                        ),
                        child: Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            const Icon(LucideIcons.flame, size: 12, color: Color(0xFFF472B6)),
                            const SizedBox(width: 4),
                            Text(
                              '${character.compatibility}%',
                              style: const TextStyle(
                                fontSize: 12,
                                fontWeight: FontWeight.bold,
                                fontFamily: 'monospace',
                                color: Colors.white,
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
        
                  // Top Right: Lock Icon
                  if (character.isLocked)
                    Positioned(
                      top: 12,
                      right: 12,
                      child: Container(
                        width: 32,
                        height: 32,
                        decoration: BoxDecoration(
                          color: Colors.black.withOpacity(0.4),
                          shape: BoxShape.circle,
                          border: Border.all(color: Colors.white.withOpacity(0.2)),
                        ),
                        child: const Icon(LucideIcons.lock, size: 14, color: Colors.white70),
                      ),
                    ),
        
                  // Bottom Content
                  Positioned(
                    bottom: 0,
                    left: 0,
                    right: 0,
                    child: Padding(
                      padding: const EdgeInsets.all(16.0),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          Text(
                            character.name,
                            style: const TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.bold,
                              color: Colors.white,
                              shadows: [Shadow(color: Colors.black45, blurRadius: 2, offset: Offset(0, 1))],
                            ),
                          ),
                          const SizedBox(height: 4),
                          Wrap(
                            spacing: 4,
                            runSpacing: 4,
                            children: character.tags.take(2).map((tag) {
                              return Container(
                                padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
                                decoration: BoxDecoration(
                                  color: Colors.white.withOpacity(0.12),
                                  borderRadius: BorderRadius.circular(10),
                                  border: Border.all(
                                    color: Colors.white.withOpacity(0.25),
                                    width: 0.8,
                                  ),
                                ),
                                child: Text(
                                  tag,
                                  style: const TextStyle(fontSize: 10, color: Colors.white),
                                ),
                              );
                            }).toList(),
                          ),
                        ],
                      ),
                    ),
                  ),
                ],
              ),
            ),
            
            // Border Overlay - Outside ClipRRect to ensure full visibility
            Positioned.fill(
              child: IgnorePointer(
                child: Container(
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(24),
                    border: Border.all(
                      color: Colors.white.withOpacity(0.15),
                      width: 1.2,
                    ),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}