import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/order_provider.dart';
import 'order_detail_screen.dart';
import 'order_invoice_screen.dart';
import 'order_track_screen.dart';

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

  @override
  State<OrdersScreen> createState() => _OrdersScreenState();
}

class _OrdersScreenState extends State<OrdersScreen> {
  String searchQuery = "";

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      Provider.of<OrderProvider>(context, listen: false).loadOrders();
    });
  }

  @override
  Widget build(BuildContext context) {
    final provider = Provider.of<OrderProvider>(context);

    if (provider.loading) {
      return const Center(child: CircularProgressIndicator());
    }

    final screenWidth = MediaQuery.of(context).size.width;
    final scale = (screenWidth / 420).clamp(0.85, 1.15);

    final filteredOrders = provider.orders.where((o) {
      final q = searchQuery.toLowerCase();
      return o["order_id"].toString().toLowerCase().contains(q) ||
          o["status"].toString().toLowerCase().contains(q) ||
          o["description"].toString().toLowerCase().contains(q) ||
          o["amount"].toString().toLowerCase().contains(q);
    }).toList();

    return Column(
      children: [
        // SEARCH BAR
        Container(
          margin: EdgeInsets.fromLTRB(16 * scale, 16 * scale, 16 * scale, 10 * scale),
          padding: EdgeInsets.symmetric(horizontal: 14 * scale),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(16 * scale),
            boxShadow: [
              BoxShadow(
                color: Colors.black12.withOpacity(0.12),
                blurRadius: 10 * scale,
                spreadRadius: 1 * scale,
                offset: Offset(0, 4 * scale),
              ),
            ],
          ),
          child: Row(
            children: [
              Icon(Icons.search, size: 22 * scale, color: Colors.grey.shade700),
              SizedBox(width: 10 * scale),
              Expanded(
                child: TextField(
                  onChanged: (value) => setState(() => searchQuery = value),
                  style: TextStyle(fontSize: 15 * scale),
                  decoration: InputDecoration(
                    hintText: "Search orders...",
                    hintStyle: TextStyle(
                      fontSize: 14 * scale,
                      color: Colors.grey.shade600,
                    ),
                    border: InputBorder.none,
                  ),
                ),
              ),
            ],
          ),
        ),

        // ORDER LIST
        Expanded(
          child: ListView.builder(
            padding: EdgeInsets.all(16 * scale),
            itemCount: filteredOrders.length,
            itemBuilder: (context, i) {
              final order = filteredOrders[i];
              return _orderCard(order, scale);
            },
          ),
        ),
      ],
    );
  }

  Widget _orderCard(Map<String, dynamic> o, double scale) {
    final progress = getProgress(o['status']);
    final badgeColor = getStatusColor(o['status']);

    return Card(
      elevation: 3 * scale,
      color: Colors.white,
      margin: EdgeInsets.only(bottom: 16 * scale),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(16 * scale),
      ),
      child: Padding(
        padding: EdgeInsets.all(16 * scale),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  "Order #${o['order_id']}",
                  style: TextStyle(
                    fontSize: 18 * scale,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                Container(
                  padding: EdgeInsets.symmetric(
                    horizontal: 12 * scale,
                    vertical: 6 * scale,
                  ),
                  decoration: BoxDecoration(
                    color: badgeColor.withOpacity(0.15),
                    borderRadius: BorderRadius.circular(12 * scale),
                  ),
                  child: Text(
                    o['status'],
                    style: TextStyle(
                      color: badgeColor,
                      fontWeight: FontWeight.bold,
                      fontSize: 13 * scale,
                    ),
                  ),
                ),
              ],
            ),

            SizedBox(height: 10 * scale),
            Text(o['description'], style: TextStyle(fontSize: 14 * scale)),
            SizedBox(height: 5 * scale),

            Text(
              "₹${o['amount']}",
              style: TextStyle(
                fontSize: 16 * scale,
                fontWeight: FontWeight.w600,
              ),
            ),

            SizedBox(height: 18 * scale),
            _AnimatedProgressBar(progress: progress, scale: scale),
            SizedBox(height: 18 * scale),

            Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                _btn(Icons.visibility, "View", Colors.green.shade800,
                    Colors.green.shade50, () => _openOrderDetails(o['order_id']), scale),

                _btn(Icons.receipt_long, "Invoice", Colors.orange.shade800,
                    Colors.orange.shade50, () => _openInvoice(o['order_id']), scale),

                _btn(Icons.local_shipping, "Track", Colors.blue.shade800,
                    Colors.blue.shade50, () => _openTrack(o['order_id']), scale),
              ],
            )
          ],
        ),
      ),
    );
  }

  Widget _btn(IconData icon, String text, Color fg, Color bg,
      VoidCallback onTap, double scale) {
    return InkWell(
      borderRadius: BorderRadius.circular(12 * scale),
      onTap: onTap,
      child: Container(
        padding: EdgeInsets.symmetric(horizontal: 20 * scale, vertical: 12 * scale),
        decoration: BoxDecoration(color: bg, borderRadius: BorderRadius.circular(12 * scale)),
        child: Row(
          children: [
            Icon(icon, size: 18 * scale, color: fg),
            SizedBox(width: 8 * scale),
            Text(
              text,
              style: TextStyle(
                color: fg,
                fontWeight: FontWeight.w600,
                fontSize: 14 * scale,
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _openOrderDetails(String id) {
    Navigator.push(context,
        MaterialPageRoute(builder: (_) => OrderDetailScreen(orderId: id)));
  }

  void _openInvoice(String id) {
    Navigator.push(context,
        MaterialPageRoute(builder: (_) => OrderInvoiceScreen(orderId: id)));
  }

  void _openTrack(String id) {
    Navigator.push(context,
        MaterialPageRoute(builder: (_) => OrderTrackScreen(orderId: id)));
  }
}

// ================= PROGRESS BAR =================

class _AnimatedProgressBar extends StatelessWidget {
  final double progress;
  final double scale;

  const _AnimatedProgressBar({required this.progress, required this.scale});

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(builder: (context, constraints) {
      return Stack(
        children: [
          Container(
            height: 10 * scale,
            decoration: BoxDecoration(
              color: Colors.grey.shade300,
              borderRadius: BorderRadius.circular(20 * scale),
            ),
          ),
          AnimatedContainer(
            duration: const Duration(milliseconds: 650),
            curve: Curves.easeInOut,
            height: 10 * scale,
            width: constraints.maxWidth * progress,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(20 * scale),
              gradient: const LinearGradient(
                colors: [
                  Color(0xFF4F8CFF),
                  Color(0xFF8A4DFF),
                ],
              ),
            ),
          ),
        ],
      );
    });
  }
}

// ================= FIXED STATUS LOGIC =================

double getProgress(String? status) {
  final s = (status ?? '')
      .toLowerCase()
      .replaceAll('_', ' ')
      .replaceAll('-', ' ')
      .trim();

  if (s == "pending") return 0.25;
  if (s == "loading") return 0.40;
  if (s.contains("transit")) return 0.65;
  if (s == "dispatched") return 0.85;
  if (s == "delivered") return 1.0;

  return 0.05;
}

Color getStatusColor(String? status) {
  final s = (status ?? '')
      .toLowerCase()
      .replaceAll('_', ' ')
      .replaceAll('-', ' ')
      .trim();

  if (s == "pending") return Colors.orange;
  if (s == "loading") return Colors.amber.shade800;
  if (s.contains("transit")) return Colors.red;
  if (s == "dispatched") return Colors.blue.shade700;
  if (s == "delivered") return Colors.green.shade700;

  return Colors.black54;
}