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* Cart service for the eCommerce platform\n */\nimport { \n getCartById, \n getCartByUser, \n getCartBySession, \n createCart, \n addItemToCart, \n updateCartItemQuantity, \n removeCartItem,\n getProductById\n} from \"../database/queries.ts\";\nimport { Cart, CartItem } from \"../../shared/types.ts\";\nimport { generateSessionId } from \"../../shared/utils.ts\";\n\n/**\n * Get or create a cart for a user\n */\nexport async function getOrCreateUserCart(userId: number): Promise {\n // Try to get existing cart\n const existingCart = await getCartByUser(userId);\n if (existingCart) {\n return existingCart;\n }\n \n // Create new cart\n const cartId = await createCart({ userId });\n return {\n id: cartId,\n userId,\n items: [],\n createdAt: new Date().toISOString(),\n updatedAt: new Date().toISOString()\n };\n}\n\n/**\n * Get or create a cart for a session\n */\nexport async function getOrCreateSessionCart(sessionId: string): Promise {\n // Try to get existing cart\n const existingCart = await getCartBySession(sessionId);\n if (existingCart) {\n return existingCart;\n }\n \n // Create new cart\n const cartId = await createCart({ sessionId });\n return {\n id: cartId,\n sessionId,\n items: [],\n createdAt: new Date().toISOString(),\n updatedAt: new Date().toISOString()\n };\n}\n\n/**\n * Get or create a cart based on user or session\n */\nexport async function getOrCreateCart(userId?: number, sessionId?: string): Promise<{ cart: Cart; sessionId?: string }> {\n // If user is logged in, get or create user cart\n if (userId) {\n const cart = await getOrCreateUserCart(userId);\n return { cart };\n }\n \n // If session ID is provided, get or create session cart\n if (sessionId) {\n const cart = await getOrCreateSessionCart(sessionId);\n return { cart, sessionId };\n }\n \n // Create new session ID and cart\n const newSessionId = generateSessionId();\n const cart = await getOrCreateSessionCart(newSessionId);\n return { cart, sessionId: newSessionId };\n}\n\n/**\n * Add a product to a cart\n */\nexport async function addToCart(cartId: number, productId: number, quantity: number): Promise {\n // Validate product exists and has enough stock\n const product = await getProductById(productId);\n if (!product) {\n throw new Error(\"Product not found\");\n }\n \n if (product.stock < quantity) {\n throw new Error(\"Not enough stock available\");\n }\n \n // Add item to cart\n await addItemToCart(cartId, productId, quantity);\n \n // Return updated cart\n const updatedCart = await getCartById(cartId);\n if (!updatedCart) {\n throw new Error(\"Cart not found\");\n }\n \n return updatedCart;\n}\n\n/**\n * Update cart item quantity\n */\nexport async function updateItemQuantity(cartItemId: number, quantity: number): Promise {\n // Get cart item to validate\n const cart = await getCartContainingItem(cartItemId);\n if (!cart) {\n throw new Error(\"Cart item not found\");\n }\n \n // Find the cart item\n const cartItem = cart.items.find(item => item.id === cartItemId);\n if (!cartItem) {\n throw new Error(\"Cart item not found\");\n }\n \n // Validate product has enough stock\n const product = await getProductById(cartItem.productId);\n if (!product) {\n throw new Error(\"Product not found\");\n }\n \n if (product.stock < quantity) {\n throw new Error(\"Not enough stock available\");\n }\n \n // Update quantity\n if (quantity <= 0) {\n // Remove item if quantity is 0 or negative\n await removeCartItem(cartItemId);\n } else {\n // Update quantity\n await updateCartItemQuantity(cartItemId, quantity);\n }\n \n // Return updated cart\n const updatedCart = await getCartById(cart.id);\n if (!updatedCart) {\n throw new Error(\"Cart not found\");\n }\n \n return updatedCart;\n}\n\n/**\n * Remove an item from a cart\n */\nexport async function removeFromCart(cartItemId: number): Promise {\n // Get cart item to validate\n const cart = await getCartContainingItem(cartItemId);\n if (!cart) {\n throw new Error(\"Cart item not found\");\n }\n \n // Remove item\n await removeCartItem(cartItemId);\n \n // Return updated cart\n const updatedCart = await getCartById(cart.id);\n if (!updatedCart) {\n throw new Error(\"Cart not found\");\n }\n \n return updatedCart;\n}\n\n/**\n * Get the cart containing a specific item\n */\nasync function getCartContainingItem(cartItemId: number): Promise {\n // This is a helper function to find which cart contains a specific item\n // In a real-world scenario, we would have a more efficient query for this\n \n // For now, we'll query the cart_items table to get the cart_id\n const result = await fetch(\"https://esm.town/v/stevekrouse/sqlite\").then(r => r.json());\n const cartResult = await result.execute(\n `SELECT cart_id FROM ecommerce_cart_items_v1 WHERE id = ?`,\n [cartItemId]\n );\n \n if (cartResult.rows.length === 0) {\n return null;\n }\n \n const cartId = cartResult.rows[0].cart_id;\n return getCartById(cartId);\n}\n\n/**\n * Merge a session cart into a user cart\n */\nexport async function mergeSessionCartToUserCart(userId: number, sessionId: string): Promise {\n // Get session cart\n const sessionCart = await getCartBySession(sessionId);\n if (!sessionCart || sessionCart.items.length === 0) {\n // No session cart or empty cart, just return user cart\n return getOrCreateUserCart(userId);\n }\n \n // Get or create user cart\n const userCart = await getOrCreateUserCart(userId);\n \n // Add items from session cart to user cart\n for (const item of sessionCart.items) {\n try {\n await addItemToCart(userCart.id, item.productId, item.quantity);\n } catch (error) {\n console.error(`Failed to add item ${item.productId} to user cart: ${error.message}`);\n // Continue with other items\n }\n }\n \n // Return updated user cart\n const updatedUserCart = await getCartById(userCart.id);\n if (!updatedUserCart) {\n throw new Error(\"Cart not found\");\n }\n \n return updatedUserCart;\n}","deleted","label",[167,168,149],"backend","services","permalink","https://www.val.town/x/MuslimTechBro/Ecommerce/code/backend/services/cart.ts","extension","actionData","errors"]