import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:supplier_new/common/settings.dart';

class CreateCreditAccountScreen extends StatefulWidget {
  @override
  _CreateCreditAccountScreenState createState() =>
      _CreateCreditAccountScreenState();
}

class _CreateCreditAccountScreenState
    extends State<CreateCreditAccountScreen> {
  String? selectedCustomerId;

  final creditLimitController = TextEditingController();
  final openingBalanceController = TextEditingController();

  bool isLoading = true;

  List<Map<String, dynamic>> customers = [];

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

  Future<void> _fetchCustomers() async {
    try {
      final response = await AppSettings.getAcceptedOrdersFromUsers();
      final decoded = jsonDecode(response);

      final List data = decoded["data"] ?? [];

      /// Already having credit accounts
      final existingCustomerIds = AppSettings.existingCreditCustomerIds;

      /// 🔑 Track unique customers
      final Set<String> seenCustomerIds = {};
      final List<Map<String, dynamic>> filtered = [];

      for (final e in data) {
        final customerId = e["customerId"]?.toString();

        if (customerId == null) continue;

        // ❌ Skip if already has credit account
        if (existingCustomerIds.contains(customerId)) continue;

        // ❌ Skip duplicates
        if (seenCustomerIds.contains(customerId)) continue;

        seenCustomerIds.add(customerId);

        filtered.add({
          "customerId": customerId,
          "name": e["customerName"] ?? "Unknown",
          "date": e["createdAt"]?.toString().substring(0, 10) ?? "",
        });
      }

      setState(() {
        customers = filtered;
        isLoading = false;
      });
    } catch (e) {
      debugPrint("⚠️ Create account customer fetch error: $e");
      setState(() => isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Create Credit Account'),
        backgroundColor: Colors.white,
        foregroundColor: Colors.black,
        elevation: 1,
      ),
      body: isLoading
          ? const Center(child: CircularProgressIndicator())
          : Padding(
        padding: const EdgeInsets.all(16),
        child: ListView(
          children: [
            /// SELECT CUSTOMER
            const Text(
              'SELECT CUSTOMER',
              style: TextStyle(fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 12),

            if (customers.isEmpty)
              const Center(
                child: Text(
                  "No eligible customers available",
                  style: TextStyle(color: Colors.grey),
                ),
              ),

            ...customers.map((customer) {
              final isSelected =
                  selectedCustomerId == customer["customerId"];

              return GestureDetector(
                onTap: () {
                  setState(() {
                    selectedCustomerId = customer["customerId"];
                  });
                },
                child: Container(
                  margin: const EdgeInsets.only(bottom: 10),
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    border: Border.all(
                      color:
                      isSelected ? Colors.black : Colors.grey.shade300,
                      width: 1.5,
                    ),
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: Row(
                    children: [
                      const CircleAvatar(
                        child: Icon(Icons.person),
                      ),
                      const SizedBox(width: 10),
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            customer["name"],
                            style: const TextStyle(fontSize: 16),
                          ),
                          Text(
                            customer["date"],
                            style:
                            const TextStyle(color: Colors.grey),
                          ),
                        ],
                      )
                    ],
                  ),
                ),
              );
            }),

            const SizedBox(height: 20),

            /// ENTER DETAILS
            const Text(
              'ENTER DETAILS',
              style: TextStyle(fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 10),

            TextField(
              controller: creditLimitController,
              keyboardType: TextInputType.number,
              decoration: const InputDecoration(
                labelText: 'Credit Limit (₹) *',
                border: OutlineInputBorder(),
              ),
            ),

            const SizedBox(height: 15),

            TextField(
              controller: openingBalanceController,
              keyboardType: TextInputType.number,
              decoration: const InputDecoration(
                labelText: 'Opening Balance (₹) *',
                border: OutlineInputBorder(),
              ),
            ),

            const SizedBox(height: 10),

            Row(
              children: const [
                Icon(Icons.info_outline,
                    color: Colors.orange, size: 18),
                SizedBox(width: 8),
                Expanded(
                  child: Text(
                    'Creating an account will notify the customer and request balance to start water delivery.',
                    style: TextStyle(fontSize: 13),
                  ),
                )
              ],
            ),

            const SizedBox(height: 20),

            ElevatedButton(
              onPressed: selectedCustomerId == null
                  ? null
                  : () async{
                final payload = {
                  "supplierId": AppSettings.supplierId,
                  "customerId": selectedCustomerId,
                  "advance_amount": double.tryParse(openingBalanceController.text) ?? 0,
                  "exceed_limit": double.tryParse(creditLimitController.text) ?? 0,
                };

                AppSettings.preLoaderDialog(context);

                final success =
                    await AppSettings.createAdvanceRequest(payload);

                Navigator.of(context, rootNavigator: true).pop();

                if (success) {
                  AppSettings.longSuccessToast("Advance request sent successfully");
                  Navigator.pop(context, true);
                } else {
                  AppSettings.longFailedToast("Failed to create account");
                }
              },
              style: ElevatedButton.styleFrom(
                backgroundColor: const Color(0xFF9375E8),
                minimumSize: const Size(double.infinity, 50),
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(30),
                ),
              ),
              child: const Text('Create Account'),
            )
          ],
        ),
      ),
    );
  }
}