import 'package:flutter/material.dart';

class InvoiceDetailView extends StatefulWidget {
  final Map invoice;
  const InvoiceDetailView({super.key, required this.invoice});

  @override
  State<InvoiceDetailView> createState() => _InvoiceDetailViewState();
}

class _InvoiceDetailViewState extends State<InvoiceDetailView>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<Offset> _slideAnimation;

  bool s1 = true;
  bool s2 = false;
  bool s3 = false;

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

    _controller = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 350),
    );

    _slideAnimation = Tween(
      begin: const Offset(0, -0.1),
      end: Offset.zero,
    ).animate(
      CurvedAnimation(parent: _controller, curve: Curves.easeOut),
    );

    _controller.forward();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  // ------------------------------------------------------------------
  // STATUS BADGE (WHITE + GRADIENT BORDER)
  // ------------------------------------------------------------------
  Widget statusBadge(String status, double scale) {
    final s = status.toLowerCase();

    LinearGradient gradient;
    Color textColor;

    switch (s) {
      case 'paid':
        gradient = const LinearGradient(
          colors: [Color(0xFF2ECC71), Color(0xFF27AE60)],
        );
        textColor = const Color(0xFF27AE60);
        break;

      case 'pending':
        gradient = const LinearGradient(
          colors: [
            Color(0xFF5B8DEF), // Soft Blue
            Color(0xFF7B5CFA), // Purple Blue
          ],
        );
        textColor = const Color(0xFF5B8DEF);
        break;

      case 'overdue':
        gradient = const LinearGradient(
          colors: [
            Color(0xFFFFB300), // Amber
            Color(0xFFFF6F00), // Deep Orange
          ],
        );
        textColor = const Color(0xFFFF6F00);
        break;

      case 'cancelled':
      case 'failed':
        gradient = const LinearGradient(
          colors: [Color(0xFFE74C3C), Color(0xFFC0392B)],
        );
        textColor = const Color(0xFFE74C3C);
        break;

      default:
        gradient = const LinearGradient(
          colors: [Color(0xFF95A5A6), Color(0xFF7F8C8D)],
        );
        textColor = Colors.grey.shade700;
    }

    return Container(
      padding: const EdgeInsets.all(1.5),
      decoration: BoxDecoration(
        gradient: gradient,
        borderRadius: BorderRadius.circular(20 * scale),
      ),
      child: Container(
        padding: EdgeInsets.symmetric(
          horizontal: 14 * scale,
          vertical: 6 * scale,
        ),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(18 * scale),
        ),
        child: Text(
          status.toUpperCase(),
          style: TextStyle(
            fontSize: 12 * scale,
            fontWeight: FontWeight.w700,
            color: textColor,
            letterSpacing: .6,
          ),
        ),
      ),
    );
  }

  // ------------------------------------------------------------------
  // HEADER CARD
  // ------------------------------------------------------------------
  Widget headerCard(Map invoice, double scale) {
    return Container(
      width: double.infinity,
      padding: EdgeInsets.all(16 * scale),
      margin: EdgeInsets.only(bottom: 14 * scale),
      decoration: BoxDecoration(
        gradient: LinearGradient(
          colors: [Colors.blue.shade400, Colors.indigo.shade600],
        ),
        borderRadius: BorderRadius.circular(16 * scale),
        boxShadow: [
          BoxShadow(
            blurRadius: 8 * scale,
            offset: Offset(0, 3 * scale),
            color: Colors.indigo.withOpacity(.3),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "Invoice #${invoice['invoice_number']}",
            style: TextStyle(
              fontSize: 20 * scale,
              color: Colors.white,
              fontWeight: FontWeight.bold,
            ),
          ),
          SizedBox(height: 4 * scale),
          Text(
            "Date: ${invoice['invoice_date']}",
            style: TextStyle(color: Colors.white70, fontSize: 13 * scale),
          ),
          SizedBox(height: 10 * scale),

          /// STATUS BADGE
          statusBadge(invoice['status'] ?? 'Unknown', scale),
        ],
      ),
    );
  }

  // ------------------------------------------------------------------
  // SECTION HEADER
  // ------------------------------------------------------------------
  Widget sectionHeader(
      String title,
      IconData icon,
      bool expanded,
      VoidCallback tap,
      double scale,
      ) {
    return GestureDetector(
      onTap: tap,
      child: Container(
        padding: EdgeInsets.all(12 * scale),
        margin: EdgeInsets.only(bottom: 8 * scale),
        decoration: BoxDecoration(
          gradient: LinearGradient(
            colors: [Colors.indigo.shade500, Colors.blue.shade400],
          ),
          borderRadius: BorderRadius.circular(12 * scale),
          boxShadow: [
            BoxShadow(
              blurRadius: 5 * scale,
              color: Colors.black.withOpacity(.15),
              offset: Offset(0, 2 * scale),
            )
          ],
        ),
        child: Row(
          children: [
            Icon(icon, color: Colors.white, size: 20 * scale),
            SizedBox(width: 8 * scale),
            Text(
              title,
              style: TextStyle(
                fontSize: 15 * scale,
                color: Colors.white,
                fontWeight: FontWeight.bold,
              ),
            ),
            const Spacer(),
            AnimatedRotation(
              turns: expanded ? .5 : 0,
              duration: const Duration(milliseconds: 250),
              child: Icon(
                Icons.keyboard_arrow_down,
                color: Colors.white,
                size: 20 * scale,
              ),
            )
          ],
        ),
      ),
    );
  }

  // ------------------------------------------------------------------
  // SECTION BODY
  // ------------------------------------------------------------------
  Widget sectionBody(bool visible, List<Widget> children, double scale) {
    return AnimatedCrossFade(
      duration: const Duration(milliseconds: 250),
      crossFadeState:
      visible ? CrossFadeState.showSecond : CrossFadeState.showFirst,
      firstChild: const SizedBox.shrink(),
      secondChild: SlideTransition(
        position: _slideAnimation,
        child: Container(
          padding: EdgeInsets.all(14 * scale),
          margin: EdgeInsets.only(bottom: 10 * scale),
          decoration: BoxDecoration(
            color: Theme.of(context).cardColor,
            borderRadius: BorderRadius.circular(12 * scale),
            boxShadow: [
              BoxShadow(
                blurRadius: 7 * scale,
                offset: Offset(0, 2 * scale),
                color: Colors.black.withOpacity(.07),
              )
            ],
          ),
          child: Column(children: children),
        ),
      ),
    );
  }

  // ------------------------------------------------------------------
  // DETAIL ROW
  // ------------------------------------------------------------------
  Widget detailRow(IconData icon, String label, dynamic value, double scale) {
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 5 * scale),
      child: Row(
        children: [
          Icon(icon, size: 18 * scale, color: Colors.blueGrey),
          SizedBox(width: 8 * scale),
          Expanded(
            flex: 3,
            child: Text(
              label,
              style: TextStyle(
                color: Colors.grey.shade600,
                fontSize: 13 * scale,
              ),
            ),
          ),
          Expanded(
            flex: 4,
            child: label == "Status"
                ? Align(
              alignment: Alignment.centerRight,
              child: statusBadge(value ?? 'Unknown', scale),
            )
                : Text(
              value?.toString() ?? "N/A",
              textAlign: TextAlign.right,
              style: TextStyle(
                fontSize: 14 * scale,
                fontWeight: FontWeight.bold,
              ),
            ),
          )
        ],
      ),
    );
  }

  // ------------------------------------------------------------------
  // MAIN BUILD
  // ------------------------------------------------------------------
  @override
  Widget build(BuildContext context) {
    final invoice = widget.invoice;
    final width = MediaQuery.of(context).size.width;
    final scale = (width / 390).clamp(0.85, 1.25);

    return ListView(
      padding: EdgeInsets.all(14 * scale),
      children: [
        headerCard(invoice, scale),

        sectionHeader(
          "Invoice Summary",
          Icons.receipt_long,
          s1,
              () => setState(() => s1 = !s1),
          scale,
        ),
        sectionBody(s1, [
          detailRow(Icons.numbers, "Invoice No", invoice['invoice_number'], scale),
          detailRow(Icons.calendar_today, "Date", invoice['invoice_date'], scale),
          detailRow(Icons.label, "Status", invoice['status'], scale),
        ], scale),

        sectionHeader(
          "Customer Details",
          Icons.person,
          s2,
              () => setState(() => s2 = !s2),
          scale,
        ),
        sectionBody(s2, [
          detailRow(Icons.person_outline, "Name", invoice['customer_name'], scale),
          detailRow(Icons.mail, "Email", invoice['customer_email'], scale),
          detailRow(Icons.phone, "Phone", invoice['customer_mobile'], scale),
          detailRow(Icons.location_on, "Address", invoice['customer_address'], scale),
        ], scale),

        sectionHeader(
          "Amount Details",
          Icons.currency_rupee,
          s3,
              () => setState(() => s3 = !s3),
          scale,
        ),
        sectionBody(s3, [
          detailRow(Icons.money, "Amount", invoice['final_amount'], scale),
          detailRow(Icons.percent, "GST %", invoice['gst_percent'], scale),
          detailRow(Icons.percent, "GST Amount", invoice['gst_amount'], scale),
          detailRow(Icons.summarize, "Total", invoice['final_amount_with_gst'], scale),
        ], scale),
      ],
    );
  }
}