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

import { Book, BookStatus, CreateBookDto, UpdateBookDto } from "@library/shared-types";
import { prisma } from "../lib/prisma";

export class BookService {
  private prisma = prisma;

  constructor() {}

  /**
   * Get all books.
   */
  async getAllBooks(): Promise<Book[]> {
    const books = await this.prisma.book.findMany({
      orderBy: { updatedAt: "desc" },
    });

    return books.map((book) => ({
      ...book,
      status: book.status as unknown as BookStatus,
      dateAdded: book.dateAdded,
      dateFinished: book.dateFinished || undefined,
      tags: book.tags ?? [],
      links: book.links ?? [],
      createdAt: book.createdAt,
      updatedAt: book.updatedAt,
    }));
  }

  /**
   * Get book by ID.
   */
  async getBookById(id: string): Promise<Book | null> {
    const book = await this.prisma.book.findUnique({
      where: { id },
    });

    if (!book) return null;

    return {
      ...book,
      status: book.status as unknown as BookStatus,
      dateAdded: book.dateAdded,
      dateFinished: book.dateFinished || undefined,
      tags: book.tags ?? [],
      links: book.links ?? [],
      createdAt: book.createdAt,
      updatedAt: book.updatedAt,
    };
  }

  /**
   * Create new book.
   */
  async createBook(data: CreateBookDto): Promise<Book> {
    const book = await this.prisma.book.create({
      data: {
        ...data,
        status: data.status.toUpperCase() as any,
      },
    });

    return {
      ...book,
      status: book.status as unknown as BookStatus,
      dateAdded: book.dateAdded,
      dateFinished: book.dateFinished || undefined,
      tags: book.tags ?? [],
      links: book.links ?? [],
      createdAt: book.createdAt,
      updatedAt: book.updatedAt,
    };
  }

  /**
   * Update book by ID.
   */
  async updateBook(id: string, data: UpdateBookDto): Promise<Book> {
    const updateData = { ...data };
    if (updateData.status) {
      updateData.status = updateData.status.toUpperCase() as any;
    }

    const book = await this.prisma.book.update({
      where: { id },
      data: updateData,
    });

    return {
      ...book,
      status: book.status as unknown as BookStatus,
      dateAdded: book.dateAdded,
      dateFinished: book.dateFinished || undefined,
      tags: book.tags ?? [],
      links: book.links ?? [],
      createdAt: book.createdAt,
      updatedAt: book.updatedAt,
    };
  }

  /**
   * Delete book by ID.
   */
  async deleteBook(id: string): Promise<void> {
    await this.prisma.book.delete({
      where: { id },
    });
  }
}