import { readFileSync } from "node:fs";
import { describe, expect, it, vi } from "vitest";
import type { ReadingManifestDto } from "../api/types";
import { createEpubApiLoader } from "./EpubReader";

const manifest: ReadingManifestDto = {
  bookId: 4,
  format: "epub",
  revision: "rev-1",
  containerPath: "META-INF/container.xml",
  opfPath: "OPS/package.opf",
  basePath: "OPS/",
  resources: [
    { resourceId: "container", href: "META-INF/container.xml", url: "/books/4/reading-resources/container", mediaType: "application/xml", size: 12, kind: "document", state: "ready" },
    { resourceId: "chapter", href: "OPS/text/chapter.xhtml", url: "/books/4/reading-resources/chapter", mediaType: "application/xhtml+xml", size: 18, kind: "chapter", state: "ready" }
  ],
  spine: [{ index: 0, href: "OPS/text/chapter.xhtml", resourceId: "chapter", url: "/books/4/reading-resources/chapter", mediaType: "application/xhtml+xml", size: 18 }],
  capabilities: { byteRanges: false, derivedImages: true, lightweightPages: false }
};

describe("EPUB adaptive loader", () => {
  it("loads manifest resources with credentials and reuses a fetched entry", async () => {
    const fetcher = vi.fn().mockResolvedValue(new Response("<html>chapter</html>", { status: 200 }));
    const loader = createEpubApiLoader(manifest, fetcher);

    await expect(loader.loadText("OPS/text/chapter.xhtml#part")).resolves.toBe("<html>chapter</html>");
    await loader.loadBlob("OPS/text/chapter.xhtml");

    expect(fetcher).toHaveBeenCalledTimes(1);
    expect(fetcher).toHaveBeenCalledWith("/books/4/reading-resources/chapter", { credentials: "include", cache: "default" });
    expect(loader.getSize("OPS/text/chapter.xhtml")).toBe(18);
  });

  it("does not contain the complete-book fetch path", () => {
    const source = readFileSync(new URL("./EpubReader.tsx", import.meta.url), "utf8");
    expect(source).not.toContain("bookFileUrl");
    expect(source).not.toContain("fetch(url");
    expect(source).not.toContain("new File(");
    expect(source).toContain("new EPUB(createEpubApiLoader(manifest)).init()");
  });
});