/**

* Supported image MIME types for upload

* Limited to most common web formats for reliability

*/

export const SUPPORTED_IMAGE_MIME_TYPES = [

'image/png',

'image/jpeg',

'image/webp',

] as const;

export type SupportedImageMimeType = typeof SUPPORTED_IMAGE_MIME_TYPES[number];

/**

* Image attachment for user messages

* Represents an image that can be sent with text prompts

*/

export interface ImageAttachment {

/** Unique identifier for this attachment */

id: string;

/** Original filename */

filename: string;

/** MIME type of the image */

mimeType: SupportedImageMimeType;

/** Base64-encoded image data (without data URL prefix) */

base64Data: string;

/** Size of the original file in bytes */

size?: number;

/** Optional dimensions if available */

dimensions?: {

width: number;

height: number;

};

}

export interface ProcessedImageAttachment {

/** MIME type of the image */

mimeType: SupportedImageMimeType;

/** Base64-encoded image data (without data URL prefix) */

base64Data?: string;

/** R2 key of the image */

r2Key: string;

/** URL of the image */

publicUrl: string;

/** image data hash */

hash: string;

}

/**

* Utility to check if a MIME type is supported

*/

export function isSupportedImageType(mimeType: string): mimeType is SupportedImageMimeType {

return SUPPORTED_IMAGE_MIME_TYPES.includes(mimeType as SupportedImageMimeType);

}

/**

* Utility to get file extension from MIME type

*/

export function getFileExtensionFromMimeType(mimeType: SupportedImageMimeType): string {

const map: Record<SupportedImageMimeType, string> = {

'image/png': 'png',

'image/jpeg': 'jpg',

'image/webp': 'webp',

};

return map[mimeType] || 'jpg';

}

/**

* Maximum file size for images (10MB)

*/

export const MAX_IMAGE_SIZE_BYTES = 10 * 1024 * 1024;

/**

* Maximum number of images per message

*/

export const MAX_IMAGES_PER_MESSAGE = 2;