changes shopping

lib/image/resize.ts

@@ -0,0 +1,51 @@
+export interface ResizeImageOptions {
+  maxWidth?: number;
+  maxHeight?: number;
+  quality?: number;
+  mimeType?: string;
+}
+
+const DEFAULT_OPTIONS: Required<ResizeImageOptions> = {
+  maxWidth: 1280,
+  maxHeight: 1280,
+  quality: 0.9,
+  mimeType: "image/jpeg",
+};
+
+/**
+ * Redimensiona uma imagem no client preservando boa qualidade.
+ * Retorna uma dataURL compactada para envio à IA.
+ */
+export async function resizeImageToDataURL(
+  file: File,
+  options: ResizeImageOptions = {},
+): Promise<{ dataUrl: string; width: number; height: number }> {
+  const opts = { ...DEFAULT_OPTIONS, ...options };
+  const bitmap = await createImageBitmap(file);
+
+  let { width, height } = bitmap;
+  const ratio = Math.min(opts.maxWidth / width, opts.maxHeight / height, 1);
+
+  if (ratio < 1) {
+    width = Math.round(width * ratio);
+    height = Math.round(height * ratio);
+  }
+
+  const canvas = document.createElement("canvas");
+  canvas.width = width;
+  canvas.height = height;
+
+  const ctx = canvas.getContext("2d");
+  if (!ctx) {
+    throw new Error("Contexto 2D não disponível para redimensionamento.");
+  }
+
+  ctx.drawImage(bitmap, 0, 0, width, height);
+
+  return {
+    dataUrl: canvas.toDataURL(opts.mimeType, opts.quality),
+    width,
+    height,
+  };
+}
+