import 'dart:async';
import 'package:flutter/material.dart';
import '../widgets/product_card.dart';

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

  @override
  _DailyBestSellsWidgetState createState() => _DailyBestSellsWidgetState();
}

class _DailyBestSellsWidgetState extends State<DailyBestSellsWidget> {
  final PageController _pageController = PageController(viewportFraction: 0.85);
  bool _isDragging = false;
  Timer? _autoScrollTimer;
  int _currentPage = 0;
  int _selectedTabIndex = 0;

  @override
  void initState() {
    super.initState();
    _startAutoScroll();
  }

  void _startAutoScroll() {
    _autoScrollTimer = Timer.periodic(const Duration(seconds: 4), (_) {
      if (!_isDragging && _pageController.hasClients) {
        final nextPage = (_currentPage + 1) % _products.length;
        _pageController.animateToPage(
          nextPage,
          duration: const Duration(milliseconds: 600),
          curve: Curves.easeInOut,
        );
      }
    });
  }

  final List<Map<String, dynamic>> _products = [
    {
      'name': 'Seeds of Change Organic Quinoa, Brown',
      'brand': 'Hodo Foods',
      'rating': 4.5,
      'originalPrice': 245.8,
      'discountedPrice': 238.85,
      'sold': 90,
      'total': 120,
      'imageUrl': 'https://nest-frontend-v6.vercel.app/assets/imgs/shop/product-3-2.jpg',
      'discount': 15,
    },
    {
      'name': 'All Natural Italian-Style Chicken Meatballs',
      'brand': 'Hodo Foods',
      'rating': 4.5,
      'originalPrice': 245.8,
      'discountedPrice': 238.85,
      'sold': 90,
      'total': 120,
      'imageUrl': 'https://nest-frontend-v6.vercel.app/assets/imgs/shop/product-3-2.jpg',
      'discount': 35,
    },
    {
      'name': 'Organic Brown Rice and Quinoa Mix',
      'brand': 'Green Harvest',
      'rating': 4.8,
      'originalPrice': 310.0,
      'discountedPrice': 280.0,
      'sold': 60,
      'total': 100,
      'imageUrl': 'https://nest-frontend-v6.vercel.app/assets/imgs/shop/product-4-1.jpg',
      'discount': 10,
    },
    {
      'name': 'Gluten-Free Coconut Flakes',
      'brand': 'Let\'s Do Organic',
      'rating': 4.7,
      'originalPrice': 299.99,
      'discountedPrice': 250.0,
      'sold': 110,
      'total': 150,
      'imageUrl': 'https://nest-frontend-v6.vercel.app/assets/imgs/shop/product-5-1.jpg',
      'discount': 25,
    },
    {
      'name': 'Organic Almond Butter Crunch',
      'brand': 'Nature\'s Best',
      'rating': 4.6,
      'originalPrice': 280.0,
      'discountedPrice': 245.0,
      'sold': 85,
      'total': 100,
      'imageUrl': 'https://nest-frontend-v6.vercel.app/assets/imgs/shop/product-6-1.jpg',
      'discount': 12,
    },
  ];

  @override
  void dispose() {
    _autoScrollTimer?.cancel();
    _pageController.dispose();
    super.dispose();
  }

  Widget _buildTabs() {
    final List<String> tabs = ["Featured", "Popular", "New added"];
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16.0),
      child: Row(
        children: List.generate(tabs.length, (index) {
          final bool isSelected = _selectedTabIndex == index;
          return GestureDetector(
            onTap: () {
              setState(() => _selectedTabIndex = index);
            },
            child: Container(
              margin: const EdgeInsets.only(right: 16),
              padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
              decoration: BoxDecoration(
                color: isSelected ? Colors.green[100] : Colors.white,
                borderRadius: BorderRadius.circular(20),
                border: Border.all(
                  color: isSelected ? Colors.green : Colors.grey.shade400,
                  width: 1,
                ),
              ),
              child: Text(
                tabs[index],
                style: TextStyle(
                  color: isSelected ? Colors.green[800] : Colors.grey[700],
                  fontWeight: isSelected ? FontWeight.bold : FontWeight.w500,
                ),
              ),
            ),
          );
        }),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _buildTabs(),
        const SizedBox(height: 16),
        SizedBox(
          height: 400,
          child: Stack(
            alignment: Alignment.center,
            children: [
              // PageView for one product at a time
              NotificationListener<ScrollNotification>(
                onNotification: (notification) {
                  if (notification is ScrollStartNotification) {
                    setState(() => _isDragging = true);
                  } else if (notification is ScrollEndNotification) {
                    setState(() => _isDragging = false);
                  } else if (notification is ScrollUpdateNotification) {
                    // Optional: update _currentPage during drag for indicators
                  }
                  return true;
                },
                child: PageView.builder(
                  controller: _pageController,
                  itemCount: _products.length,
                  onPageChanged: (index) {
                    setState(() => _currentPage = index);
                  },
                  itemBuilder: (context, index) {
                    final product = _products[index];
                    return Padding(
                      padding: const EdgeInsets.symmetric(horizontal: 16),
                      child: ProductCard(
                        productName: product['name']!,
                        brand: product['brand']!,
                        rating: product['rating']!,
                        originalPrice: product['originalPrice']!,
                        discountedPrice: product['discountedPrice']!,
                        sold: product['sold']!,
                        total: product['total']!,
                        imageUrl: product['imageUrl']!,
                        discount: product['discount']!,
                        onPressed: () {
                          ScaffoldMessenger.of(context).showSnackBar(
                            const SnackBar(content: Text("Added to cart!")),
                          );
                        },
                      ),
                    );
                  },
                ),
              ),

              // Left Arrow
              Positioned(
                left: 16,
                child: _scrollArrowButton(Icons.arrow_back_ios, _goToPrevious),
              ),

              // Right Arrow
              Positioned(
                right: 16,
                child: _scrollArrowButton(Icons.arrow_forward_ios, _goToNext),
              ),

              // Optional: Page indicators (dots) at bottom
              // Positioned(
              //   bottom: 16,
              //   left: 0,
              //   right: 0,
              //   child: Row(
              //     mainAxisAlignment: MainAxisAlignment.center,
              //     children: List.generate(_products.length, (index) {
              //       return Container(
              //         width: 8,
              //         height: 8,
              //         margin: const EdgeInsets.symmetric(horizontal: 4),
              //         decoration: BoxDecoration(
              //           shape: BoxShape.circle,
              //           color: _currentPage == index ? Colors.green : Colors.grey[300],
              //         ),
              //       );
              //     }),
              //   ),
              // ),
            ],
          ),
        ),
      ],
    );
  }

  Widget _scrollArrowButton(IconData icon, VoidCallback onPressed) {
    return Container(
      decoration: BoxDecoration(
        color: Colors.green.withOpacity(0.8),
        shape: BoxShape.circle,
        boxShadow: [
          BoxShadow(
            color: Colors.white.withOpacity(0.15),
            blurRadius: 4,
            spreadRadius: 2,
          ),
        ],
      ),
      child: IconButton(
        icon: Icon(icon, size: 24, color: Colors.black87),
        onPressed: onPressed,
      ),
    );
  }

  void _goToPrevious() {
    if (_currentPage > 0) {
      _pageController.animateToPage(
        _currentPage - 1,
        duration: const Duration(milliseconds: 500),
        curve: Curves.easeInOut,
      );
    }
  }

  void _goToNext() {
    if (_currentPage < _products.length - 1) {
      _pageController.animateToPage(
        _currentPage + 1,
        duration: const Duration(milliseconds: 500),
        curve: Curves.easeInOut,
      );
    }
  }
}