/**
 * Invoices Screen
 *
 * Invoice list with filters
 */

import { useState, useEffect, useCallback } from 'react';
import {
  View,
  Text,
  StyleSheet,
  FlatList,
  TouchableOpacity,
  RefreshControl,
  ActivityIndicator,
} from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { invoicesApi } from '@/services/api';
import { Invoice } from '@/types';

type StatusFilter = 'all' | 'draft' | 'posted' | 'paid';

const statusConfig = {
  draft: { label: 'Borrador', color: '#6b7280', bg: '#f3f4f6' },
  posted: { label: 'Publicada', color: '#d97706', bg: '#fef3c7' },
  paid: { label: 'Pagada', color: '#059669', bg: '#d1fae5' },
  cancelled: { label: 'Cancelada', color: '#dc2626', bg: '#fee2e2' },
};

export default function InvoicesScreen() {
  const [invoices, setInvoices] = useState<Invoice[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [refreshing, setRefreshing] = useState(false);
  const [filter, setFilter] = useState<StatusFilter>('all');

  const fetchInvoices = async () => {
    try {
      const params: any = { limit: 50 };
      if (filter !== 'all') params.state = filter;

      const response = await invoicesApi.list(params);
      setInvoices(response.data || []);
    } catch (error) {
      console.error('Error fetching invoices:', error);
      // Use mock data for demo
      setInvoices([
        { id: '1', number: 'INV-2024-001', partnerId: '1', partnerName: 'Empresa ABC', invoiceType: 'out_invoice', state: 'paid', invoiceDate: '2024-01-15', amountTotal: 15999.00, amountDue: 0, currency: 'MXN' },
        { id: '2', number: 'INV-2024-002', partnerId: '2', partnerName: 'Cliente XYZ', invoiceType: 'out_invoice', state: 'posted', invoiceDate: '2024-01-18', dueDate: '2024-02-18', amountTotal: 8500.00, amountDue: 8500.00, currency: 'MXN' },
        { id: '3', number: 'INV-2024-003', partnerId: '3', partnerName: 'Distribuidor Norte', invoiceType: 'out_invoice', state: 'draft', invoiceDate: '2024-01-20', amountTotal: 12300.00, amountDue: 12300.00, currency: 'MXN' },
        { id: '4', number: 'INV-2024-004', partnerId: '1', partnerName: 'Empresa ABC', invoiceType: 'out_invoice', state: 'posted', invoiceDate: '2024-01-22', dueDate: '2024-02-22', amountTotal: 5670.00, amountDue: 5670.00, currency: 'MXN' },
      ]);
    } finally {
      setIsLoading(false);
      setRefreshing(false);
    }
  };

  useEffect(() => {
    fetchInvoices();
  }, [filter]);

  const onRefresh = useCallback(() => {
    setRefreshing(true);
    fetchInvoices();
  }, [filter]);

  const formatCurrency = (amount: number) => {
    return new Intl.NumberFormat('es-MX', {
      style: 'currency',
      currency: 'MXN',
    }).format(amount);
  };

  const formatDate = (dateStr: string) => {
    return new Date(dateStr).toLocaleDateString('es-MX', {
      day: '2-digit',
      month: 'short',
      year: 'numeric',
    });
  };

  const filteredInvoices = filter === 'all'
    ? invoices
    : invoices.filter((inv) => inv.state === filter);

  const renderInvoice = ({ item }: { item: Invoice }) => {
    const status = statusConfig[item.state] || statusConfig.draft;

    return (
      <TouchableOpacity style={styles.invoiceCard}>
        <View style={styles.invoiceHeader}>
          <Text style={styles.invoiceNumber}>{item.number}</Text>
          <View style={[styles.statusBadge, { backgroundColor: status.bg }]}>
            <Text style={[styles.statusText, { color: status.color }]}>{status.label}</Text>
          </View>
        </View>
        <Text style={styles.partnerName}>{item.partnerName}</Text>
        <View style={styles.invoiceDetails}>
          <View style={styles.detailItem}>
            <Ionicons name="calendar-outline" size={14} color="#9ca3af" />
            <Text style={styles.detailText}>{formatDate(item.invoiceDate)}</Text>
          </View>
          {item.dueDate && item.state !== 'paid' && (
            <View style={styles.detailItem}>
              <Ionicons name="time-outline" size={14} color="#9ca3af" />
              <Text style={styles.detailText}>Vence: {formatDate(item.dueDate)}</Text>
            </View>
          )}
        </View>
        <View style={styles.invoiceFooter}>
          <View>
            <Text style={styles.amountLabel}>Total</Text>
            <Text style={styles.amountValue}>{formatCurrency(item.amountTotal)}</Text>
          </View>
          {item.amountDue > 0 && item.state !== 'draft' && (
            <View style={styles.amountDue}>
              <Text style={styles.dueLabel}>Pendiente</Text>
              <Text style={styles.dueValue}>{formatCurrency(item.amountDue)}</Text>
            </View>
          )}
        </View>
      </TouchableOpacity>
    );
  };

  return (
    <View style={styles.container}>
      {/* Filters */}
      <View style={styles.filters}>
        {(['all', 'draft', 'posted', 'paid'] as StatusFilter[]).map((status) => (
          <TouchableOpacity
            key={status}
            style={[styles.filterButton, filter === status && styles.filterButtonActive]}
            onPress={() => setFilter(status)}
          >
            <Text style={[styles.filterText, filter === status && styles.filterTextActive]}>
              {status === 'all' ? 'Todas' : statusConfig[status]?.label || status}
            </Text>
          </TouchableOpacity>
        ))}
      </View>

      {/* List */}
      {isLoading ? (
        <View style={styles.loadingContainer}>
          <ActivityIndicator size="large" color="#1e40af" />
        </View>
      ) : (
        <FlatList
          data={filteredInvoices}
          renderItem={renderInvoice}
          keyExtractor={(item) => item.id}
          contentContainerStyle={styles.listContent}
          refreshControl={
            <RefreshControl refreshing={refreshing} onRefresh={onRefresh} tintColor="#1e40af" />
          }
          ListEmptyComponent={
            <View style={styles.emptyContainer}>
              <Ionicons name="document-text-outline" size={48} color="#d1d5db" />
              <Text style={styles.emptyText}>No se encontraron facturas</Text>
            </View>
          }
        />
      )}

      {/* FAB */}
      <TouchableOpacity style={styles.fab}>
        <Ionicons name="add" size={24} color="#ffffff" />
      </TouchableOpacity>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#f8fafc',
  },
  filters: {
    flexDirection: 'row',
    padding: 16,
    gap: 8,
  },
  filterButton: {
    paddingHorizontal: 16,
    paddingVertical: 8,
    borderRadius: 20,
    backgroundColor: '#ffffff',
  },
  filterButtonActive: {
    backgroundColor: '#1e40af',
  },
  filterText: {
    fontSize: 14,
    color: '#64748b',
  },
  filterTextActive: {
    color: '#ffffff',
    fontWeight: '500',
  },
  listContent: {
    padding: 16,
    paddingTop: 0,
  },
  invoiceCard: {
    backgroundColor: '#ffffff',
    borderRadius: 12,
    padding: 16,
    marginBottom: 12,
  },
  invoiceHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: 8,
  },
  invoiceNumber: {
    fontSize: 16,
    fontWeight: '700',
    color: '#1f2937',
  },
  statusBadge: {
    paddingHorizontal: 10,
    paddingVertical: 4,
    borderRadius: 12,
  },
  statusText: {
    fontSize: 12,
    fontWeight: '600',
  },
  partnerName: {
    fontSize: 14,
    color: '#64748b',
    marginBottom: 12,
  },
  invoiceDetails: {
    flexDirection: 'row',
    gap: 16,
    marginBottom: 12,
  },
  detailItem: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 4,
  },
  detailText: {
    fontSize: 13,
    color: '#9ca3af',
  },
  invoiceFooter: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'flex-end',
    paddingTop: 12,
    borderTopWidth: 1,
    borderTopColor: '#f1f5f9',
  },
  amountLabel: {
    fontSize: 12,
    color: '#9ca3af',
  },
  amountValue: {
    fontSize: 18,
    fontWeight: '700',
    color: '#1f2937',
  },
  amountDue: {
    alignItems: 'flex-end',
  },
  dueLabel: {
    fontSize: 12,
    color: '#dc2626',
  },
  dueValue: {
    fontSize: 16,
    fontWeight: '600',
    color: '#dc2626',
  },
  loadingContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  emptyContainer: {
    alignItems: 'center',
    paddingVertical: 48,
  },
  emptyText: {
    fontSize: 16,
    color: '#9ca3af',
    marginTop: 12,
  },
  fab: {
    position: 'absolute',
    bottom: 24,
    right: 24,
    width: 56,
    height: 56,
    borderRadius: 28,
    backgroundColor: '#1e40af',
    justifyContent: 'center',
    alignItems: 'center',
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.25,
    shadowRadius: 4,
    elevation: 5,
  },
});