"use client";

import React, { createContext, useContext, useState, ReactNode } from "react";
import { Product } from "@/data/products";

export interface CartItem {
  product: Product;
  quantity: number;
  selectedColor: string;
  selectedLength: string;
}

interface CartContextType {
  items: CartItem[];
  addItem: (product: Product, color: string, length: string) => void;
  removeItem: (productId: string) => void;
  updateQuantity: (productId: string, quantity: number) => void;
  clearCart: () => void;
  totalItems: number;
  totalPrice: number;
  isCartOpen: boolean;
  setIsCartOpen: (open: boolean) => void;
}

const CartContext = createContext<CartContextType | undefined>(undefined);

export const CartProvider = ({ children }: { children: ReactNode }) => {
  const [items, setItems] = useState<CartItem[]>([]);
  const [isCartOpen, setIsCartOpen] = useState(false);

  const addItem = (product: Product, color: string, length: string) => {
    setItems((prev) => {
      const existing = prev.find((i) => i.product.id === product.id && i.selectedColor === color && i.selectedLength === length);
      if (existing) {
        return prev.map((i) =>
          i.product.id === product.id && i.selectedColor === color && i.selectedLength === length
            ? { ...i, quantity: i.quantity + 1 }
            : i
        );
      }
      return [...prev, { product, quantity: 1, selectedColor: color, selectedLength: length }];
    });
    setIsCartOpen(true);
  };

  const removeItem = (productId: string) => {
    setItems((prev) => prev.filter((i) => i.product.id !== productId));
  };

  const updateQuantity = (productId: string, quantity: number) => {
    if (quantity <= 0) {
      removeItem(productId);
      return;
    }
    setItems((prev) => prev.map((i) => (i.product.id === productId ? { ...i, quantity } : i)));
  };

  const clearCart = () => setItems([]);

  const totalItems = items.reduce((sum, i) => sum + i.quantity, 0);
  const totalPrice = items.reduce((sum, i) => sum + i.product.price * i.quantity, 0);

  return (
    <CartContext.Provider value={{ items, addItem, removeItem, updateQuantity, clearCart, totalItems, totalPrice, isCartOpen, setIsCartOpen }}>
      {children}
    </CartContext.Provider>
  );
};

export const useCart = () => {
  const context = useContext(CartContext);
  if (!context) throw new Error("useCart must be used within CartProvider");
  return context;
};