import sharp from 'sharp';
import { env } from '../env';
import { HttpError } from './http';

export const AVATAR_SIZE = 512;
/** Full-size photos from 50-200 MP phone cameras can be well over 10 MB (the app shrinks them first since 1.3.0). */
export const AVATAR_MAX_UPLOAD_BYTES = 25 * 1024 * 1024;

/**
 * Uploaded avatars are stored as a path (`/avatars/<id>?v=<version>`) so they keep
 * working if the API moves; older rows may hold a full external URL.
 */
export const publicAvatarUrl = (stored: string | null): string | null =>
  stored?.startsWith('/') ? env.API_PUBLIC_URL.replace(/\/$/, '') + stored : stored;

/**
 * Square-crops, resizes and re-encodes to WebP. Re-encoding also drops EXIF
 * (phone photos carry GPS location) and anything that isn't image data.
 */
export async function processAvatar(input: Buffer, log?: (err: unknown) => void): Promise<Buffer> {
  try {
    // sharp's default pixel limit (~268 MP) fits a 200 MP camera; JPEGs are shrunk while decoding, so it stays cheap.
    return await sharp(input, { animated: false })
      .rotate() // apply the EXIF orientation before it's stripped
      .resize(AVATAR_SIZE, AVATAR_SIZE, { fit: 'cover', position: 'attention' })
      .webp({ quality: 82 })
      .toBuffer();
  } catch (err) {
    log?.(err);
    throw new HttpError(400, "That file isn't an image we can read. Try a JPEG, PNG, WebP or HEIC.");
  }
}