library/api/src/app/routes/books/index.ts

/**
 * @copyright 2026 NHCarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */

import { FastifyPluginAsync } from "fastify";
import { Book, CreateBookDto, UpdateBookDto, Comment, CreateCommentDto, AuditAction, AuditCategory } from "@library/shared-types";
import { BookService } from "../../services/book.service";
import { CommentService } from "../../services/comment.service";
import { AuditService } from "../../services/audit.service";
import { adminGuard } from "../../middleware/admin-guard";
import { bannedGuard } from "../../middleware/banned-guard";

const booksRoutes: FastifyPluginAsync = async (app) => {
  const bookService = new BookService();
  const commentService = new CommentService();

  /**
   * Get all books (public route).
   */
  app.get<{ Reply: Book[] }>("/", async () => {
    return bookService.getAllBooks();
  });

  /**
   * Get single book by ID (public route).
   */
  app.get<{ Params: { id: string }; Reply: Book | null }>(
    "/:id",
    async (request) => {
      const { id } = request.params;
      return bookService.getBookById(id);
    }
  );

  /**
   * Create new book (admin only).
   */
  app.post<{ Body: CreateBookDto; Reply: Book }>(
    "/",
    {
      preValidation: [app.authenticate, adminGuard],
      preHandler: [app.csrfProtection],
    },
    async (request) => {
      const book = await bookService.createBook(request.body);
      await AuditService.logFromRequest(request, {
        action: AuditAction.ENTRY_CREATE,
        category: AuditCategory.CONTENT,
        resourceType: "book",
        resourceId: book.id,
        details: `Created book: ${book.title}`,
      });
      return book;
    }
  );

  /**
   * Update book by ID (admin only).
   */
  app.put<{
    Params: { id: string };
    Body: UpdateBookDto;
    Reply: Book | null;
  }>(
    "/:id",
    {
      preValidation: [app.authenticate, adminGuard],
      preHandler: [app.csrfProtection],
    },
    async (request) => {
      const { id } = request.params;
      const book = await bookService.updateBook(id, request.body);
      if (book) {
        await AuditService.logFromRequest(request, {
          action: AuditAction.ENTRY_UPDATE,
          category: AuditCategory.CONTENT,
          resourceType: "book",
          resourceId: id,
          details: `Updated book: ${book.title}`,
        });
      }
      return book;
    }
  );

  /**
   * Delete book by ID (admin only).
   */
  app.delete<{ Params: { id: string }; Reply: { success: boolean } }>(
    "/:id",
    {
      preValidation: [app.authenticate, adminGuard],
      preHandler: [app.csrfProtection],
    },
    async (request) => {
      const { id } = request.params;
      await bookService.deleteBook(id);
      await AuditService.logFromRequest(request, {
        action: AuditAction.ENTRY_DELETE,
        category: AuditCategory.CONTENT,
        resourceType: "book",
        resourceId: id,
        details: `Deleted book with ID: ${id}`,
      });
      return { success: true };
    }
  );

  /**
   * Get comments for a book (public route).
   */
  app.get<{ Params: { id: string }; Reply: Comment[] }>(
    "/:id/comments",
    async (request) => {
      const { id } = request.params;
      return commentService.getCommentsForBook(id);
    }
  );

  /**
   * Add comment to a book (authenticated users).
   */
  app.post<{ Params: { id: string }; Body: CreateCommentDto; Reply: Comment }>(
    "/:id/comments",
    {
      preValidation: [app.authenticate, bannedGuard],
      preHandler: [app.csrfProtection],
    },
    async (request) => {
      const { id } = request.params;
      const userId = request.user.id;
      const comment = await commentService.createCommentForBook(id, userId, request.body);
      await AuditService.logFromRequest(request, {
        action: AuditAction.COMMENT_CREATE,
        category: AuditCategory.CONTENT,
        resourceType: "book",
        resourceId: id,
        details: `Added comment to book`,
      });
      return comment;
    }
  );

  /**
   * Update comment (owner or admin).
   */
  app.put<{ Params: { id: string; commentId: string }; Body: CreateCommentDto; Reply: Comment | { error: string } }>(
    "/:id/comments/:commentId",
    {
      preValidation: [app.authenticate],
      preHandler: [app.csrfProtection],
    },
    async (request, reply) => {
      const { id, commentId } = request.params;
      const userId = request.user.id;
      const isAdmin = request.user.isAdmin;

      const verification = await commentService.verifyCommentOwnership(commentId, "book", id);

      if (!verification.exists) {
        return reply.code(404).send({ error: "Comment not found" });
      }

      if (verification.comment?.userId !== userId && !isAdmin) {
        return reply.code(403).send({ error: "You can only edit your own comments" });
      }

      const comment = await commentService.updateComment(commentId, request.body.content);
      await AuditService.logFromRequest(request, {
        action: AuditAction.COMMENT_UPDATE,
        category: AuditCategory.CONTENT,
        resourceType: "book",
        resourceId: id,
        details: `Updated comment ${commentId} on book`,
      });
      return comment;
    }
  );

  /**
   * Delete comment (owner or admin).
   */
  app.delete<{ Params: { id: string; commentId: string }; Reply: { success: boolean } | { error: string } }>(
    "/:id/comments/:commentId",
    {
      preValidation: [app.authenticate],
      preHandler: [app.csrfProtection],
    },
    async (request, reply) => {
      const { id, commentId } = request.params;
      const userId = request.user.id;
      const isAdmin = request.user.isAdmin;

      const verification = await commentService.verifyCommentOwnership(commentId, "book", id);

      if (!verification.exists) {
        return reply.code(404).send({ error: "Comment not found" });
      }

      if (verification.comment?.userId !== userId && !isAdmin) {
        return reply.code(403).send({ error: "You can only delete your own comments" });
      }

      await commentService.deleteComment(commentId);
      await AuditService.logFromRequest(request, {
        action: AuditAction.COMMENT_DELETE,
        category: isAdmin && verification.comment?.userId !== userId ? AuditCategory.ADMIN : AuditCategory.CONTENT,
        resourceType: "book",
        resourceId: id,
        details: `Deleted comment ${commentId} from book`,
      });
      return { success: true };
    }
  );
};

export default booksRoutes;