import React, { useState, useEffect, useCallback } from "react";
import { Box, Typography, Skeleton, useTheme, Button } from "@mui/material";
import MealCard from "./MealCard";
import authService from "../../../../services/authService";
import AddMeal from "./AddMeal";
import SimplePagination from "../../SimplePagination";

const MealsByCateg = ({
  restaurantId,
  categoryId,
  onProductClick,
  onAddMeal,
  categoryName,
  onBack,
}) => {
  const theme = useTheme();

  const [products, setProducts] = useState([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState(null);
  const [openModal, setOpenModal] = useState(false);
  const [page, setPage] = useState(1);
  const [pagination, setPagination] = useState(null);

  const itemsPerPage = 6;

  // استخدام useCallback لمنع إنشاء الدالة عند كل إعادة render
  const fetchMeals = useCallback(async () => {
    if (!restaurantId || !categoryId) return;
    setLoading(true);
    setError(null);
    try {
      const result = await authService.getMealsByCategory(
        restaurantId,
        categoryId,
        page
      );

      if (result.success) {
        const mealsWithImages = result.data.map((meal) => ({
          id: meal.id,
          name: meal.name,
          price: meal.price,
          description: meal.description || [],
          additions: meal.additions || [],
          unit: meal.unit || "/pcs",
          photo: meal.photo || "/images/default-product.png",
          category_id: meal.category_id || categoryId,
        }));
        setProducts(mealsWithImages);
        setPagination(result.pagination);
      } else {
        setProducts([]);
        setPagination(null);
      }
    } catch (err) {
      console.error(err);
      setError("Failed to fetch meals.");
      setProducts([]);
      setPagination(null);
    } finally {
      setLoading(false);
    }
  }, [restaurantId, categoryId, page]);

  // جلب البيانات عند تغيير restaurantId أو categoryId أو page
  useEffect(() => {
    fetchMeals();
  }, [fetchMeals]);

  // إضافة وجبة جديدة وتحديث القائمة فورًا
// في MealsByCateg
const handleAddProduct = async (meal) => {
  setOpenModal(false);              // اغلاق مودال الإضافة
  setPage(1);                        // العودة للصفحة الأولى
  const result = await fetchMeals(); // جلب الوجبات بعد الإضافة
  if (onAddMeal) onAddMeal(meal);    // تمرير الوجبة للمكون الأب
};

  return (
    <Box
      sx={{
        mb: 2,
        pl: { xs: 2, sm: 3 },
        pr: { xs: 2, sm: 3 },
        pb: { xs: 2, sm: 3 },
        pt: { xs: 2, sm: 1.5 },
        maxWidth: { xs: "90%", md: "100%" },
        backgroundColor: "#FFFFFF",
        borderRadius: "10px",
        padding: "20px",
        display: "flex",
        flexDirection: "column",
        gap: "20px",
        overflowY: "auto",
      }}
    >
      {/* العنوان + أزرار */}
      <Box sx={{ display: "flex", justifyContent: "space-between", alignItems: "center" }}>
        <Typography variant="h6" fontWeight={600}>
          {categoryName || "Meals"}
        </Typography>
        <Box sx={{ display: "flex", alignItems: "center", gap: 2 }}>
          <Button
            onClick={() => setOpenModal(true)}
            sx={{
              textTransform: "none",
              color: "#fff",
              backgroundColor: theme.palette.primary.main,
              borderRadius: "8px",
              height: "40px",
              width: { xs: "100%", sm: "130px", md: "150px" },
              fontWeight: 700,
            }}
          >
            Add Product
          </Button>
          <Button variant="text" color="primary" sx={{ ml: 1 }} onClick={onBack}>
            Back
          </Button>
        </Box>
      </Box>

      {/* حالة التحميل أو الخطأ */}
      {loading ? (
        <Box sx={{ display: "flex", flexWrap: "wrap", gap: 2 }}>
          {Array.from({ length: itemsPerPage }).map((_, index) => (
            <Box key={index} sx={{ flex: "1 1 calc(33.33% - 16px)" }}>
              <Skeleton variant="rectangular" width="100%" height={180} sx={{ borderRadius: 2 }} />
              <Skeleton variant="text" width="80%" sx={{ mt: 1 }} />
              <Skeleton variant="text" width="40%" />
            </Box>
          ))}
        </Box>
      ) : error ? (
        <Box sx={{ display: "flex", justifyContent: "center", mt: 4 }}>
          <Typography variant="body1" color="error">{error}</Typography>
        </Box>
      ) : products.length === 0 ? (
        <Box sx={{ display: "flex", justifyContent: "center", alignItems: "center", minHeight: "150px" }}>
          <Typography variant="body1" color="text.secondary">
            There is no meal available
          </Typography>
        </Box>
      ) : (
        <Box sx={{ display: "flex", flexWrap: "wrap", gap: 2 }}>
          {products.map((product) => (
            <Box
              key={product.id}
              onClick={() =>
                onProductClick({
                  ...product,
                  category: categoryName,
                  category_id: categoryId,
                })
              }
            >
              <MealCard
                meal={product}
                onClick={() =>
                  onProductClick({
                    ...product,
                    category: categoryName,
                    category_id: categoryId,
                  })
                }
                onAdd={onAddMeal}
              />
            </Box>
          ))}
        </Box>
      )}

      {/* Pagination Footer */}
      {pagination && !loading && pagination.last_page > 1 && (
        <Box display="flex" justifyContent="space-between" alignItems="center" mt={2} sx={{ borderTop: "1px solid #f0f0f0", pt: 2 }}>
          <Typography variant="body2" color="text.secondary">
            Showing {(page - 1) * itemsPerPage + 1} to{" "}
            {Math.min(page * itemsPerPage, pagination.total)} of {pagination.total} meals
          </Typography>

          <SimplePagination
            currentPage={page}
            pageCount={pagination.last_page}
            onChange={(newPage) => setPage(newPage)}
          />
        </Box>
      )}

      {/* Add Meal Modal */}
      <AddMeal
        open={openModal}
        onClose={() => setOpenModal(false)}
        onAdd={handleAddProduct}
        selectedCategory={categoryId}
        restaurantId={restaurantId}
      />
    </Box>
  );
};

export default MealsByCateg;