import { View, Text, FlatList, TouchableOpacity, ActivityIndicator, RefreshControl } from 'react-native';
import { useQuery } from '@tanstack/react-query';
import { router } from 'expo-router';
import { api } from '../../../services/api';

// Installations are tickets of type INSTALLATION (or filtered by subject prefix)
// We query tickets with type=INSTALLATION if the API supports it, fallback to all open tickets
async function fetchInstallations() {
  try {
    const res = await api.get('/api/v1/tickets?type=INSTALLATION&limit=50');
    return res.data?.data ?? res.data ?? [];
  } catch {
    // Fallback: all OPEN tickets
    const res = await api.get('/api/v1/tickets?status=OPEN&limit=50');
    return res.data?.data ?? res.data ?? [];
  }
}

const STATUS_STYLE: Record<string, { bg: string; text: string }> = {
  OPEN:        { bg: '#EFF6FF', text: '#2563EB' },
  IN_PROGRESS: { bg: '#FFFBEB', text: '#D97706' },
  RESOLVED:    { bg: '#F0FDF4', text: '#16A34A' },
  CLOSED:      { bg: '#F3F4F6', text: '#6B7280' },
};

export default function InstallationsScreen() {
  const { data, isLoading, refetch, isRefetching } = useQuery({
    queryKey: ['installations'],
    queryFn: fetchInstallations,
  });

  const installations: any[] = data ?? [];

  return (
    <View className="flex-1 bg-gray-50">
      {/* Header */}
      <View className="px-4 pt-14 pb-4 bg-blue-600">
        <Text className="text-white text-xl font-bold">Installations</Text>
        <Text className="text-white/70 text-xs mt-0.5">
          {installations.length} pending
        </Text>
      </View>

      {isLoading ? (
        <View className="flex-1 items-center justify-center">
          <ActivityIndicator color="#2563EB" />
        </View>
      ) : (
        <FlatList
          data={installations}
          keyExtractor={(item) => item.id}
          refreshControl={<RefreshControl refreshing={isRefetching} onRefresh={refetch} />}
          contentContainerStyle={{ padding: 16 }}
          renderItem={({ item }) => {
            const statusStyle = STATUS_STYLE[item.status] ?? { bg: '#F3F4F6', text: '#6B7280' };
            return (
              <TouchableOpacity
                className="bg-white rounded-xl p-4 mb-3 border border-gray-100"
                onPress={() => router.push(`/(app)/installations/${item.id}`)}
              >
                <View className="flex-row justify-between items-start mb-2">
                  <Text className="font-semibold text-gray-900 flex-1 mr-2" numberOfLines={2}>
                    {item.subject}
                  </Text>
                  <View className="rounded-full px-2.5 py-1" style={{ backgroundColor: statusStyle.bg }}>
                    <Text className="text-xs font-semibold" style={{ color: statusStyle.text }}>
                      {item.status?.replace('_', ' ')}
                    </Text>
                  </View>
                </View>

                <View className="flex-row items-center">
                  <Text className="text-gray-500 text-sm flex-1">
                    {item.client?.firstName} {item.client?.lastName}
                  </Text>
                  <Text className="text-gray-400 text-xs">
                    {item.createdAt ? new Date(item.createdAt).toLocaleDateString() : ''}
                  </Text>
                </View>

                {item.client?.address && (
                  <Text className="text-gray-400 text-xs mt-1 ml-0" numberOfLines={1}>
                    📍 {item.client.address}
                  </Text>
                )}

                {/* Confirm button if not yet resolved */}
                {item.status !== 'RESOLVED' && item.status !== 'CLOSED' && (
                  <TouchableOpacity
                    className="mt-3 bg-green-600 rounded-xl py-2.5 items-center"
                    onPress={() => router.push(`/(app)/installations/${item.id}`)}
                  >
                    <Text className="text-white font-semibold text-sm">📷 Confirm Installation</Text>
                  </TouchableOpacity>
                )}
              </TouchableOpacity>
            );
          }}
          ListEmptyComponent={
            <View className="items-center py-16">
              <Text className="text-5xl mb-4">🔌</Text>
              <Text className="text-gray-700 font-semibold text-base">No installations pending</Text>
              <Text className="text-gray-400 text-sm mt-1">All caught up!</Text>
            </View>
          }
        />
      )}
    </View>
  );
}