import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:qpay/screens/accounts/account_provider.dart';
import 'package:qpay/screens/accounts/models/account_model.dart';
import 'package:shared_preferences/shared_preferences.dart';

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

  @override
  State<AccountBalanceWidget> createState() => _AccountBalanceWidgetState();
}

class _AccountBalanceWidgetState extends State<AccountBalanceWidget>
    with SingleTickerProviderStateMixin {
  late AccountProvider _accountProvider;

  AccountModel? _usdAccount;
  AccountModel? _zwgAccount;
  bool _isLoadingUsd = false;
  bool _isLoadingZwG = false;
  String? _usdError;
  String? _zwgError;
  String? _phoneNumber;

  late AnimationController _pulseController;

  @override
  void initState() {
    super.initState();
    _pulseController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 800),
    );
    _accountProvider = AccountProvider();
    _loadBalances();
  }

  @override
  void dispose() {
    _pulseController.dispose();
    _accountProvider.dispose();
    super.dispose();
  }

  Future<void> _loadBalances() async {
    final prefs = await SharedPreferences.getInstance();
    _phoneNumber = prefs.getString('phone');

    if (_phoneNumber == null || _phoneNumber!.isEmpty) return;

    setState(() {
      _isLoadingUsd = true;
      _isLoadingZwG = true;
    });

    // Fetch USD balance
    final usdResult = await _accountProvider.fetchAccount(
      'USD$_phoneNumber',
    );
    if (mounted) {
      setState(() {
        _isLoadingUsd = false;
        if (usdResult.isSuccess && usdResult.data != null) {
          _usdAccount = usdResult.data;
          _usdError = null;
        } else {
          _usdError = usdResult.error;
        }
      });
    }

    // Fetch ZWG balance
    final zwgResult = await _accountProvider.fetchAccount(
      'ZWG$_phoneNumber',
    );
    if (mounted) {
      setState(() {
        _isLoadingZwG = false;
        if (zwgResult.isSuccess && zwgResult.data != null) {
          _zwgAccount = zwgResult.data;
          _zwgError = null;
        } else {
          _zwgError = zwgResult.error;
        }
      });
    }

    if (mounted) {
      _pulseController.forward();
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final isDark = theme.brightness == Brightness.dark;

    if (_phoneNumber == null || _phoneNumber!.isEmpty) {
      return const SizedBox.shrink();
    }

    return Padding(
      padding: const EdgeInsets.only(bottom: 16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          _buildSectionLabel(
            theme,
            isDark,
            Icons.account_balance_wallet_rounded,
            'Account Balances',
          ),
          const SizedBox(height: 12),
          Row(
            children: [
              Expanded(
                child: _buildBalanceCard(
                  theme: theme,
                  isDark: isDark,
                  currencyCode: 'USD',
                  currencyName: 'US Dollar',
                  flagAsset: 'united-states.png',
                  balance: _usdAccount?.balance,
                  isLoading: _isLoadingUsd,
                  error: _usdError,
                  gradientColors: [
                    const Color(0xFF0D47A1),
                    const Color(0xFF1976D2),
                  ],
                ),
              ),
              const SizedBox(width: 12),
              Expanded(
                child: _buildBalanceCard(
                  theme: theme,
                  isDark: isDark,
                  currencyCode: 'ZWG',
                  currencyName: 'Zimbabwe Gold',
                  flagAsset: 'zimbabwe.png',
                  balance: _zwgAccount?.balance,
                  isLoading: _isLoadingZwG,
                  error: _zwgError,
                  gradientColors: [
                    const Color(0xFF1B5E20),
                    const Color(0xFF388E3C),
                  ],
                ),
              ),
            ],
          ),
          const SizedBox(height: 8),
          Center(
            child: TextButton.icon(
              onPressed: _isLoadingUsd || _isLoadingZwG
                  ? null
                  : () {
                      _pulseController.reset();
                      _loadBalances();
                    },
              icon: AnimatedBuilder(
                animation: _pulseController,
                builder: (context, child) {
                  return Transform.rotate(
                    angle: _pulseController.value * 6.2832,
                    child: Icon(
                      Icons.refresh_rounded,
                      size: 16,
                      color: _isLoadingUsd || _isLoadingZwG
                          ? (isDark ? Colors.white24 : Colors.grey.shade400)
                          : theme.colorScheme.primary,
                    ),
                  );
                },
              ),
              label: Text(
                _isLoadingUsd || _isLoadingZwG
                    ? 'Refreshing...'
                    : 'Refresh Balances',
                style: TextStyle(
                  fontSize: 12,
                  fontWeight: FontWeight.w600,
                  color: _isLoadingUsd || _isLoadingZwG
                      ? (isDark ? Colors.white24 : Colors.grey.shade400)
                      : theme.colorScheme.primary,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildBalanceCard({
    required ThemeData theme,
    required bool isDark,
    required String currencyCode,
    required String currencyName,
    required String flagAsset,
    double? balance,
    required bool isLoading,
    String? error,
    required List<Color> gradientColors,
  }) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(20),
        gradient: LinearGradient(
          colors: gradientColors,
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        boxShadow: [
          BoxShadow(
            color: gradientColors[0].withValues(alpha: 0.3),
            blurRadius: 12,
            offset: const Offset(0, 4),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Top row: flag + currency code
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Container(
                    width: 24,
                    height: 24,
                    decoration: BoxDecoration(
                      shape: BoxShape.circle,
                      border: Border.all(
                        color: Colors.white.withValues(alpha: 0.3),
                        width: 1.5,
                      ),
                    ),
                    child: ClipOval(
                      child: Image.asset(
                        flagAsset,
                        fit: BoxFit.cover,
                        errorBuilder: (_, __, ___) => Icon(
                          Icons.monetization_on_outlined,
                          size: 14,
                          color: Colors.white.withValues(alpha: 0.8),
                        ),
                      ),
                    ),
                  ),
                  const SizedBox(width: 8),
                  Text(
                    currencyCode,
                    style: const TextStyle(
                      fontSize: 13,
                      fontWeight: FontWeight.w700,
                      color: Colors.white,
                      letterSpacing: 0.5,
                    ),
                  ),
                ],
              ),
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                decoration: BoxDecoration(
                  color: Colors.white.withValues(alpha: 0.2),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: Text(
                  currencyName,
                  style: TextStyle(
                    fontSize: 8,
                    fontWeight: FontWeight.w500,
                    color: Colors.white.withValues(alpha: 0.9),
                  ),
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          // Balance amount
          if (isLoading)
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Container(
                  width: 80,
                  height: 14,
                  decoration: BoxDecoration(
                    color: Colors.white.withValues(alpha: 0.3),
                    borderRadius: BorderRadius.circular(4),
                  ),
                ),
                const SizedBox(height: 4),
                Container(
                  width: 50,
                  height: 10,
                  decoration: BoxDecoration(
                    color: Colors.white.withValues(alpha: 0.2),
                    borderRadius: BorderRadius.circular(4),
                  ),
                ),
              ],
            )
          else if (error != null)
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Icon(
                  Icons.error_outline_rounded,
                  color: Colors.white.withValues(alpha: 0.7),
                  size: 20,
                ),
                const SizedBox(height: 4),
                Text(
                  'Unavailable',
                  style: TextStyle(
                    fontSize: 11,
                    fontWeight: FontWeight.w500,
                    color: Colors.white.withValues(alpha: 0.7),
                  ),
                ),
              ],
            )
          else ...[
            Text(
              _formatBalance(balance ?? 0.0),
              style: const TextStyle(
                fontSize: 22,
                fontWeight: FontWeight.w800,
                color: Colors.white,
                letterSpacing: 0.5,
                height: 1.1,
              ),
            ),
            const SizedBox(height: 4),
            Text(
              currencyCode == 'USD' ? 'Available Balance' : 'Available Balance',
              style: TextStyle(
                fontSize: 10,
                fontWeight: FontWeight.w400,
                color: Colors.white.withValues(alpha: 0.7),
              ),
            ),
          ],
        ],
      ),
    );
  }

  Widget _buildSectionLabel(
    ThemeData theme,
    bool isDark,
    IconData icon,
    String label,
  ) {
    return Row(
      children: [
        Container(
          width: 32,
          height: 32,
          decoration: BoxDecoration(
            color: theme.colorScheme.primary.withValues(alpha: 0.1),
            borderRadius: BorderRadius.circular(10),
          ),
          child: Icon(icon, size: 16, color: theme.colorScheme.primary),
        ),
        const SizedBox(width: 10),
        Text(
          label,
          style: TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w700,
            color: isDark ? Colors.white : Colors.black87,
            letterSpacing: 0.3,
          ),
        ),
      ],
    );
  }

  String _formatBalance(double balance) {
    final formatter = NumberFormat('#,##0.00', 'en_US');
    return '\$${formatter.format(balance)}';
  }
}