rules_version = '2';

service firebase.storage {
  match /b/{bucket}/o {

    function isSignedIn() {
      return request.auth != null;
    }

    // Single Firestore read — Storage rules allow at most 2 Firestore document accesses
    // per evaluation; pairing exists()+get() on users then on upcoming/manga exceeds that.
    function isAdmin() {
      return isSignedIn()
        && firestore.get(/databases/(default)/documents/users/$(request.auth.uid)).data.role == 'admin';
    }

    function isReasonableImage() {
      return request.resource != null
        && request.resource.size < 15 * 1024 * 1024
        && request.resource.contentType.matches('image/.*');
    }

    // fileName like "{upcomingDocId}.jpg" — Firestore row must exist; get() fails if missing.
    function ownsUpcomingCover(fileName) {
      return isSignedIn()
        && fileName.matches('.*\\.jpg')
        && fileName.split('.').size() == 2
        && firestore.get(/databases/(default)/documents/upcoming/$(fileName.split('.')[0])).data.authorId == request.auth.uid;
    }

    function mangaAuthorFromJpg(fileName) {
      return isSignedIn()
        && fileName.split('.').size() == 2
        && fileName.split('.')[1] == 'jpg'
        && firestore.get(/databases/(default)/documents/manga/$(fileName.split('.')[0])).data.authorId == request.auth.uid;
    }

    match /{allPaths=**} {
      allow read: if true;
    }

    match /avatars/{fileName} {
      allow write: if isSignedIn()
        && isReasonableImage()
        && fileName == request.auth.uid + '.jpg';
    }

    match /social/{fileName} {
      allow write: if isSignedIn() && isReasonableImage();
    }

    match /social_images/{fileName} {
      allow write: if isSignedIn() && isReasonableImage();
    }

    match /series_covers/{fileName} {
      allow write: if isReasonableImage()
        && (mangaAuthorFromJpg(fileName) || isAdmin());
    }

    match /series_banners/{fileName} {
      allow write: if isReasonableImage()
        && (mangaAuthorFromJpg(fileName) || isAdmin());
    }

    match /upcoming_covers/{fileName} {
      allow write: if isReasonableImage()
        && (ownsUpcomingCover(fileName) || isAdmin());
    }
  }
}