rules_version = '2';

service cloud.firestore {
  match /databases/{database}/documents {

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

    function isAdmin() {
      return isSignedIn()
        && exists(/databases/$(database)/documents/users/$(request.auth.uid))
        && get(/databases/$(database)/documents/users/$(request.auth.uid)).data.role == 'admin';
    }

    // Toggle like on social_posts: only likedBy + likes may change; count must match list length.
    function isSocialLikeReactionUpdate() {
      return isSignedIn()
        && request.resource.data.diff(resource.data).affectedKeys().hasOnly(['likedBy', 'likes'])
        && request.resource.data.likedBy is list
        && request.resource.data.likes == request.resource.data.likedBy.size();
    }

    // --- USERS ---
    match /users/{userId} {
      allow get: if true;
      allow list: if isAdmin();

      allow create: if isSignedIn() && request.auth.uid == userId;

      allow update: if isAdmin() || (
        isSignedIn()
        && request.auth.uid == userId
        && !request.resource.data.diff(resource.data).affectedKeys()
          .hasAny(['rankLevel', 'role', 'isVerified', 'isBanned'])
      );

      match /{allPaths=**} {
        allow read, write: if isSignedIn() && (request.auth.uid == userId || isAdmin());
      }
    }

    // --- SOCIAL ---
    match /social_posts/{postId} {
      allow read: if true;

      allow create: if isSignedIn()
        && request.resource.data.authorId == request.auth.uid;

      allow update: if isAdmin() || (
        isSignedIn()
        && resource.data.authorId == request.auth.uid
        && request.resource.data.authorId == resource.data.authorId
      ) || isSocialLikeReactionUpdate();

      allow delete: if isAdmin()
        || (isSignedIn() && resource.data.authorId == request.auth.uid);

      match /comments/{commentId} {
        allow read: if true;
        allow create: if isSignedIn()
          && request.resource.data.uid == request.auth.uid;
        allow update, delete: if isAdmin()
          || (isSignedIn() && resource.data.uid == request.auth.uid);
      }
    }

    // --- UPCOMING (Soon tab; artists manage own rows) ---
    match /upcoming/{announcementId} {
      allow read: if true;

      allow create: if isSignedIn()
        && request.resource.data.authorId == request.auth.uid
        && request.resource.data.keys().hasAll([
          'kind', 'authorId', 'authorName', 'seriesTitle'
        ])
        && request.resource.data.kind in ['new_series', 'chapter_drop']
        && (
          request.resource.data.dateTbd == true
          || request.resource.data.targetDate is timestamp
        );

      allow update: if isAdmin() || (
        isSignedIn()
        && resource.data.authorId == request.auth.uid
        && request.resource.data.authorId == resource.data.authorId
      );

      allow delete: if isAdmin()
        || (isSignedIn() && resource.data.authorId == request.auth.uid);
    }

    // --- MANGA & CHAPTERS ---
    match /manga/{mangaId} {
      allow read: if true;

      // Anyone signed in can bump read counts; series author can edit portfolio fields.
      allow update: if isAdmin()
        || (isSignedIn()
          && request.resource.data.diff(resource.data).affectedKeys().hasOnly(['reads']))
        || (isSignedIn()
          && resource.data.keys().hasAll(['authorId'])
          && resource.data.authorId == request.auth.uid
          && request.resource.data.authorId == resource.data.authorId
          && request.resource.data.diff(resource.data).affectedKeys()
            .hasOnly(['coverUrl', 'bannerUrl', 'synopsis', 'aboutArtist', 'socials']));

      allow write: if isAdmin();

      match /chapters/{chapterId} {
        allow read: if true;

        allow create, update: if isAdmin();

        allow delete: if isAdmin()
          || (isSignedIn()
            && exists(/databases/$(database)/documents/manga/$(mangaId))
            && get(/databases/$(database)/documents/manga/$(mangaId)).data.authorId == request.auth.uid);

        match /page_interactions/{pageId} {
          allow read: if true;
          allow create, update: if isSignedIn();

          match /comments/{commentId} {
            allow read: if true;
            allow create: if isSignedIn()
              && request.resource.data.uid == request.auth.uid;
            allow update: if isAdmin()
              || (isSignedIn() && resource.data.uid == request.auth.uid);
            allow delete: if isAdmin()
              || (isSignedIn() && resource.data.uid == request.auth.uid);
          }
        }
      }
    }

    // --- MARKETPLACE ---
    match /marketplace/{itemId} {
      allow read: if true;
      allow write: if isAdmin();
    }

    // Sign-up validates a known code via get(); listing all codes is admin-only.
    match /invite_codes/{code} {
      allow get: if true;
      allow list: if isAdmin();
      allow create, update, delete: if isAdmin();
    }

    // --- SYSTEM BROADCAST ---
    match /system/announcement {
      allow read: if true;
      allow write: if isAdmin();
    }
  }
}