import React, { useCallback } from 'react';
import {
  View,
  TouchableOpacity,
  ActivityIndicator,
  ScrollView,
} from 'react-native';
import { useRouter, useLocalSearchParams } from 'expo-router';
import MaterialIcons from '@expo/vector-icons/MaterialIcons';
import {
  AppContainer,
  MyText,
  tw,
} from 'common-ui';
import { trpc } from '@/src/trpc-client';
import { formatDistanceToNow } from 'date-fns';
import dayjs from 'dayjs';

interface Order {
  id: number;
  readableId: number;
  totalAmount: string;
  createdAt: string;
  status: string;
  isFlashDelivery: boolean;
  itemCount: number;
}

interface OrderItemProps {
  order: Order;
  onPress: () => void;
}

const getStatusColor = (status: string) => {
  switch (status) {
    case 'delivered':
      return 'text-green-600 bg-green-50 border-green-100';
    case 'cancelled':
      return 'text-red-600 bg-red-50 border-red-100';
    default:
      return 'text-yellow-600 bg-yellow-50 border-yellow-100';
  }
};

const OrderItem: React.FC<OrderItemProps> = ({ order, onPress }) => {
  const statusStyle = getStatusColor(order.status);
  
  return (
    <TouchableOpacity
      onPress={onPress}
      activeOpacity={0.7}
      style={tw`bg-white rounded-xl border border-gray-100 p-4 mb-3 shadow-sm`}
    >
      <View style={tw`flex-row items-center justify-between mb-3`}>
        <View style={tw`flex-row items-center`}>
          <MyText style={tw`text-lg font-bold text-gray-900`}>
            #{order.readableId}
          </MyText>
          {order.isFlashDelivery && (
            <View style={tw`ml-2 px-2 py-0.5 bg-amber-100 rounded-full border border-amber-200`}>
              <MyText style={tw`text-[10px] font-black text-amber-700 uppercase`}>⚡</MyText>
            </View>
          )}
        </View>
        <View style={tw`px-3 py-1 rounded-full border ${statusStyle}`}>
          <MyText style={tw`text-xs font-bold uppercase tracking-wider ${statusStyle.split(' ')[0]}`}>
            {order.status}
          </MyText>
        </View>
      </View>
      
      <View style={tw`flex-row justify-between items-center`}>
        <View>
          <MyText style={tw`text-gray-500 text-sm mb-1`}>
            {dayjs(order.createdAt).format('MMM DD, YYYY • h:mm A')}
          </MyText>
          <MyText style={tw`text-gray-400 text-xs`}>
            {order.itemCount} {order.itemCount === 1 ? 'item' : 'items'}
          </MyText>
        </View>
        <MyText style={tw`text-xl font-bold text-blue-600`}>
          ₹{order.totalAmount}
        </MyText>
      </View>
      
      <View style={tw`mt-3 pt-3 border-t border-gray-100 flex-row items-center justify-center`}>
        <MyText style={tw`text-blue-600 font-medium text-sm`}>
          View Order Details
        </MyText>
        <MaterialIcons name="chevron-right" size={18} color="#3b82f6" />
      </View>
    </TouchableOpacity>
  );
};

export default function UserDetails() {
  const router = useRouter();
  const { id } = useLocalSearchParams<{ id: string }>();
  const userId = id ? parseInt(id) : 0;

  const { data, isLoading, error, refetch } = trpc.admin.user.getUserDetails.useQuery(
    { userId },
    { enabled: !!userId }
  );

  const handleOrderPress = useCallback((orderId: number) => {
    router.push(`/(drawer)/order-details/${orderId}`);
  }, [router]);

  if (isLoading) {
    return (
      <AppContainer>
        <View style={tw`flex-1 justify-center items-center`}>
          <ActivityIndicator size="large" color="#3b82f6" />
          <MyText style={tw`text-gray-500 mt-4`}>Loading user details...</MyText>
        </View>
      </AppContainer>
    );
  }

  if (error || !data) {
    return (
      <AppContainer>
        <View style={tw`flex-1 justify-center items-center p-8`}>
          <MaterialIcons name="error-outline" size={64} color="#ef4444" />
          <MyText style={tw`text-gray-900 text-lg font-bold mt-4`}>Error</MyText>
          <MyText style={tw`text-gray-500 mt-2 text-center`}>
            {error?.message || 'Failed to load user details'}
          </MyText>
          <TouchableOpacity
            onPress={() => refetch()}
            style={tw`mt-6 bg-blue-600 px-6 py-3 rounded-full`}
          >
            <MyText style={tw`text-white font-semibold`}>Retry</MyText>
          </TouchableOpacity>
        </View>
      </AppContainer>
    );
  }

  const { user, orders } = data;
  const displayName = user.name || 'Unnamed User';

  return (
    <AppContainer>
      <View style={tw`flex-1 bg-gray-50`}>
        {/* Header */}
        <View style={tw`bg-white px-4 py-4 border-b border-gray-200 flex-row items-center`}>
          <TouchableOpacity
            onPress={() => router.back()}
            style={tw`p-2 -ml-4`}
          >
            <MaterialIcons name="chevron-left" size={24} color="#374151" />
          </TouchableOpacity>
          <MyText style={tw`text-xl font-bold text-gray-900 ml-2`}>User Details</MyText>
        </View>

        <ScrollView showsVerticalScrollIndicator={false}>
          {/* User Info Card */}
          <View style={tw`bg-white p-5 m-4 rounded-2xl shadow-sm border border-gray-100`}>
            <View style={tw`flex-row items-center mb-4`}>
              <View style={tw`w-12 h-12 bg-blue-50 rounded-full items-center justify-center mr-4`}>
                <MaterialIcons name="person" size={24} color="#3B82F6" />
              </View>
              <View style={tw`flex-1`}>
                <MyText style={tw`text-gray-900 font-bold text-lg mb-0.5`}>
                  {user.mobile || 'No Mobile'}
                </MyText>
                <MyText style={tw`text-gray-500`}>
                  {displayName}
                </MyText>
              </View>
            </View>
            
            <View style={tw`bg-gray-50 p-3 rounded-xl`}>
              <View style={tw`flex-row items-center`}>
                <MaterialIcons name="access-time" size={18} color="#6B7280" />
                <MyText style={tw`ml-2 text-gray-600`}>
                  Registered {formatDistanceToNow(new Date(user.createdAt), { addSuffix: true })}
                </MyText>
              </View>
            </View>
          </View>

          {/* Orders Section */}
          <View style={tw`px-4 pb-8`}>
            <View style={tw`flex-row items-center justify-between mb-4`}>
              <MyText style={tw`text-lg font-bold text-gray-900`}>Order History</MyText>
              <MyText style={tw`text-gray-500 text-sm`}>
                {orders.length} {orders.length === 1 ? 'order' : 'orders'}
              </MyText>
            </View>

            {orders.length === 0 ? (
              <View style={tw`bg-white rounded-xl border border-gray-100 p-8 items-center`}>
                <MaterialIcons name="shopping-bag" size={48} color="#e5e7eb" />
                <MyText style={tw`text-gray-500 mt-4 text-center`}>
                  No orders yet
                </MyText>
              </View>
            ) : (
              orders.map((order) => (
                <OrderItem
                  key={order.id}
                  order={order}
                  onPress={() => handleOrderPress(order.id)}
                />
              ))
            )}
          </View>
        </ScrollView>
      </View>
    </AppContainer>
  );
}
