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

const PRIORITY_COLOR: Record<string, string> = { HIGH: '#DC2626', MEDIUM: '#D97706', LOW: '#16A34A' };
const STATUS_FILTERS = ['ALL', 'OPEN', 'IN_PROGRESS', 'RESOLVED', 'CLOSED'];

export default function TicketsScreen() {
  const [search, setSearch] = useState('');
  const [statusFilter, setStatusFilter] = useState('ALL');

  const { data, isLoading, refetch, isRefetching } = useQuery({
    queryKey: ['tickets'],
    queryFn: () => api.get('/api/v1/tickets?limit=100').then(r => r.data?.data ?? r.data ?? []),
  });

  const tickets = (data ?? []).filter((t: any) => {
    const matchSearch = `${t.subject} ${t.client?.firstName} ${t.client?.lastName}`.toLowerCase().includes(search.toLowerCase());
    const matchStatus = statusFilter === 'ALL' || t.status === statusFilter;
    return matchSearch && matchStatus;
  });

  return (
    <View className="flex-1 bg-gray-50">
      {/* Header */}
      <View className="px-4 pt-14 pb-4 bg-primary flex-row justify-between items-center">
        <Text className="text-white text-xl font-bold">Tickets</Text>
        <TouchableOpacity
          className="bg-white/20 rounded-xl px-4 py-2"
          onPress={() => router.push('/(app)/tickets/new')}
        >
          <Text className="text-white font-semibold text-sm">+ New</Text>
        </TouchableOpacity>
      </View>

      {/* Search */}
      <View className="px-4 pt-3 pb-2 bg-white border-b border-gray-100">
        <TextInput
          className="bg-gray-100 border border-gray-200 rounded-xl px-4 py-3 mb-2"
          placeholder="Search tickets..."
          value={search}
          onChangeText={setSearch}
        />
        {/* Status filter chips */}
        <ScrollView horizontal showsHorizontalScrollIndicator={false} className="pb-1">
          {STATUS_FILTERS.map(s => (
            <TouchableOpacity
              key={s}
              onPress={() => setStatusFilter(s)}
              className={`rounded-full px-3 py-1.5 mr-2 ${statusFilter === s ? 'bg-primary' : 'bg-gray-100'}`}
            >
              <Text className={`text-xs font-semibold ${statusFilter === s ? 'text-white' : 'text-gray-600'}`}>
                {s.replace('_', ' ')}
              </Text>
            </TouchableOpacity>
          ))}
        </ScrollView>
      </View>

      {isLoading ? (
        <View className="flex-1 items-center justify-center"><ActivityIndicator color="#2563EB" /></View>
      ) : (
        <FlatList
          data={tickets}
          keyExtractor={(item) => item.id}
          refreshControl={<RefreshControl refreshing={isRefetching} onRefresh={refetch} />}
          contentContainerStyle={{ paddingHorizontal: 16, paddingVertical: 12, paddingBottom: 32 }}
          renderItem={({ item }) => (
            <TouchableOpacity
              className="bg-white rounded-xl p-4 mb-2 border border-gray-100"
              onPress={() => router.push(`/(app)/tickets/${item.id}`)}
            >
              <View className="flex-row justify-between items-start mb-1">
                <Text className="font-semibold text-gray-900 flex-1 mr-2" numberOfLines={2}>{item.subject}</Text>
                <View className="rounded-full px-2 py-0.5" style={{ backgroundColor: `${PRIORITY_COLOR[item.priority] ?? '#6B7280'}20` }}>
                  <Text className="text-xs font-medium" style={{ color: PRIORITY_COLOR[item.priority] ?? '#6B7280' }}>{item.priority}</Text>
                </View>
              </View>
              <View className="flex-row justify-between items-center">
                <Text className="text-gray-500 text-sm">
                  {item.client?.firstName} {item.client?.lastName}
                </Text>
                <Text className="text-gray-400 text-xs">{item.status?.replace('_', ' ')}</Text>
              </View>
            </TouchableOpacity>
          )}
          ListEmptyComponent={
            <View className="items-center py-20">
              <Text className="text-4xl mb-3">🎫</Text>
              <Text className="text-gray-400 text-base">No tickets found</Text>
              <TouchableOpacity
                className="mt-4 bg-primary rounded-xl px-6 py-3"
                onPress={() => router.push('/(app)/tickets/new')}
              >
                <Text className="text-white font-semibold">Create First Ticket</Text>
              </TouchableOpacity>
            </View>
          }
        />
      )}
    </View>
  );
}
