first commit

ui/components/prompts/utils/attachment.ts

@@ -0,0 +1,42 @@
+import { MessageContent } from "@/lib/message";
+
+export function fileToBase64(file: File): Promise<string> {
+	return new Promise((resolve, reject) => {
+		const reader = new FileReader();
+		reader.onload = () => resolve(reader.result as string);
+		reader.onerror = reject;
+		reader.readAsDataURL(file);
+	});
+}
+
+export async function fileToAttachment(file: File): Promise<MessageContent | null> {
+	if (file.type.startsWith("image/")) {
+		const dataUrl = await fileToBase64(file);
+		return {
+			type: "image_url",
+			image_url: { url: dataUrl, detail: "auto" },
+		};
+	}
+
+	if (file.type.startsWith("audio/")) {
+		const dataUrl = await fileToBase64(file);
+		// Extract base64 data and format from data URL
+		const base64Data = dataUrl.split(",")[1] || "";
+		const format = file.name.split(".").pop() || file.type.split("/")[1] || "wav";
+		return {
+			type: "input_audio",
+			input_audio: { data: base64Data, format },
+		};
+	}
+
+	// Generic file — API expects full data URL with MIME prefix
+	const dataUrl = await fileToBase64(file);
+	return {
+		type: "file",
+		file: {
+			file_data: dataUrl,
+			filename: file.name,
+			file_type: file.type || "application/octet-stream",
+		},
+	};
+}