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import fs from "fs/promises";
import path from "path";
import { logger } from "@/lib/logging";
export interface ImageProcessingOptions {
productId: number;
imageIndex: number;
quality?: number;
}
export interface ProcessedImage {
url: string;
thumbnailUrl: string;
fullSize: {
filename: string;
path: string;
size: number;
dimensions: { width: number; height: number };
};
thumbnail: {
filename: string;
path: string;
size: number;
dimensions: { width: number; height: number };
};
}
const IMAGE_DIMENSIONS = {
FULL: { width: 800, height: 800 },
THUMBNAIL: { width: 200, height: 200 }};
const PRODUCTS_DIR = path.join(process.cwd(), "public", "images", "products");
/**
* Generate filename for product image
*/
function generateFilename(productId: number, imageIndex: number, type: "full" | "thumb"): string {
const suffix = type === "thumb" ? "-thumb" : "";
return `product-${productId}-${imageIndex}${suffix}.webp`;
}
/**
* Process uploaded image: create both full-size and thumbnail versions
*/
export async function processProductImage(
buffer: Buffer,
options: ImageProcessingOptions
): Promise<ProcessedImage> {
const { productId, imageIndex, quality = 85 } = options;
// Validate image
const metadata = await sharp(buffer).metadata();
if (!metadata.width || !metadata.height) {
throw new Error("Invalid image file");
}
// Ensure directory exists
await fs.mkdir(PRODUCTS_DIR, { recursive: true });
// Process full-size image
const fullFilename = generateFilename(productId, imageIndex, "full");
const fullPath = path.join(PRODUCTS_DIR, fullFilename);
const fullBuffer = await sharp(buffer)
.resize(IMAGE_DIMENSIONS.FULL.width, IMAGE_DIMENSIONS.FULL.height, {
fit: "cover",
position: "center"})
.webp({ quality })
.toBuffer();
await fs.writeFile(fullPath, fullBuffer);
const fullStats = await fs.stat(fullPath);
// Process thumbnail
const thumbFilename = generateFilename(productId, imageIndex, "thumb");
const thumbPath = path.join(PRODUCTS_DIR, thumbFilename);
const thumbBuffer = await sharp(buffer)
.resize(IMAGE_DIMENSIONS.THUMBNAIL.width, IMAGE_DIMENSIONS.THUMBNAIL.height, {
fit: "cover",
position: "center"})
.webp({ quality: 80 })
.toBuffer();
await fs.writeFile(thumbPath, thumbBuffer);
const thumbStats = await fs.stat(thumbPath);
return {
url: `/images/products/${fullFilename}`,
thumbnailUrl: `/images/products/${thumbFilename}`,
fullSize: {
filename: fullFilename,
path: fullPath,
size: fullStats.size,
dimensions: IMAGE_DIMENSIONS.FULL},
thumbnail: {
filename: thumbFilename,
path: thumbPath,
size: thumbStats.size,
dimensions: IMAGE_DIMENSIONS.THUMBNAIL}};
}
/**
* Validate image file
*/
export function validateImageFile(
file: File | Buffer,
maxSizeMB: number = 10
): { valid: boolean; error?: string } {
const maxSizeBytes = maxSizeMB * 1024 * 1024;
const size = file instanceof File ? file.size : file.length;
if (size > maxSizeBytes) {
return { valid: false, error: `File size exceeds ${maxSizeMB}MB limit` };
}
if (file instanceof File) {
if (!file.type.startsWith("image/")) {
return { valid: false, error: "File must be an image" };
}
}
return { valid: true };
}
/**
* Delete product image files (both full and thumbnail)
*/
export async function deleteProductImage(url: string, thumbnailUrl: string): Promise<void> {
const fullFilename = url.split("/").pop();
const thumbFilename = thumbnailUrl.split("/").pop();
for (const filename of [fullFilename, thumbFilename]) {
if (!filename) continue;
const filepath = path.join(PRODUCTS_DIR, filename);
try {
await fs.unlink(filepath);
} catch (error) {
logger.error(`Failed to delete file ${filename}`, error instanceof Error ? error : new Error(String(error)), { category: "IMAGE" });
// Don't throw - file may already be deleted
}
}
}
/**
* Get next available image index for a product
*/
export async function getNextImageIndex(productId: number): Promise<number> {
try {
const files = await fs.readdir(PRODUCTS_DIR);
// Match pattern: product-{id}-{index}.webp (not thumbnail)
const productPattern = new RegExp(`^product-${productId}-(\\d+)\\.webp$`);
const matchingFiles = files.filter((f) => productPattern.test(f));
if (matchingFiles.length === 0) return 1;
const indices = matchingFiles.map((f) => {
const match = f.match(productPattern);
return match ? parseInt(match[1]) : 0;
});
return Math.max(...indices) + 1;
} catch {
return 1; // Default to 1 if directory doesn't exist yet
}
}
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