ReadaBook/apps/api/src/libraries/library-path.test.ts

import { closeSync, existsSync, mkdtempSync, openSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join, resolve } from "node:path";
import { afterEach, describe, expect, it } from "vitest";
import { LibraryPathValidationError, resolveLibraryPath } from "./library-path.js";

const tempDirs: string[] = [];
const realBooksPath = "/home/anthony/Documents/Projects/ReadaBook/Books";

afterEach(() => {
  for (const dir of tempDirs.splice(0)) {
    rmSync(dir, { recursive: true, force: true });
  }
});

describe("library path resolution", () => {
  it("resolves a readable directory", () => {
    const dir = mkdtempSync(join(tmpdir(), "readabook-library-"));
    tempDirs.push(dir);

    expect(resolveLibraryPath(dir)).toBe(resolve(dir));
  });

  it("maps a host path alias to the mounted container path", () => {
    const hostRoot = "/host/project/Books";
    const mountedRoot = mkdtempSync(join(tmpdir(), "readabook-mounted-books-"));
    tempDirs.push(mountedRoot);

    expect(resolveLibraryPath(hostRoot, [{ from: hostRoot, to: mountedRoot }])).toBe(resolve(mountedRoot));
  });

  it("rejects regular files with a stable code", () => {
    const dir = mkdtempSync(join(tmpdir(), "readabook-library-"));
    tempDirs.push(dir);
    const file = join(dir, "book.epub");
    closeSync(openSync(file, "w"));

    expect(() => resolveLibraryPath(file)).toThrowError(LibraryPathValidationError);
    try {
      resolveLibraryPath(file);
    } catch (error) {
      expect(error).toMatchObject({ code: "LIBRARY_PATH_NOT_DIRECTORY" });
    }
  });

  it.runIf(existsSync(realBooksPath))("accepts the real Books corpus path used by QA", () => {
    expect(resolveLibraryPath(realBooksPath)).toBe(resolve(realBooksPath));
  });
});