import { mkdirSync, mkdtempSync, rmSync, symlinkSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import path from "node:path";
import { afterEach, describe, expect, it } from "vitest";
import {
  checkMediaLibraryFolder,
  mediaLibraryFileType,
  walkMediaLibrary,
} from "./media-library.js";

const dirs: string[] = [];
function tempDir() {
  const dir = mkdtempSync(path.join(tmpdir(), "rakazo-library-unit-"));
  dirs.push(dir);
  return dir;
}

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

async function walk(root: string) {
  const out: string[] = [];
  for await (const file of walkMediaLibrary(root)) out.push(file);
  return out;
}

describe("media library", () => {
  it("indexes photos and videos only", () => {
    expect(mediaLibraryFileType("IMG_0001.JPG")).toEqual({ kind: "photo", mimeType: "image/jpeg" });
    expect(mediaLibraryFileType("clip.mp4")).toEqual({ kind: "video", mimeType: "video/mp4" });
    expect(mediaLibraryFileType("song.mp3")).toBeNull();
    expect(mediaLibraryFileType("notes.txt")).toBeNull();
  });

  it("walks below the folder without hidden entries or symlinks", async () => {
    const root = tempDir();
    const outside = tempDir();
    mkdirSync(path.join(root, "2024", "Summer"), { recursive: true });
    mkdirSync(path.join(root, ".cache"));
    writeFileSync(path.join(root, "2024", "Summer", "b.jpg"), "x");
    writeFileSync(path.join(root, "2024", "a.png"), "x");
    writeFileSync(path.join(root, "2024", "readme.txt"), "x");
    writeFileSync(path.join(root, ".cache", "c.jpg"), "x");
    writeFileSync(path.join(root, ".hidden.jpg"), "x");
    writeFileSync(path.join(outside, "d.jpg"), "x");
    symlinkSync(path.join(outside, "d.jpg"), path.join(root, "link.jpg"));
    symlinkSync(outside, path.join(root, "linked-folder"));

    expect(await walk(root)).toEqual(["2024/Summer/b.jpg", "2024/a.png"]);
  });

  it("accepts only an absolute path to an existing folder", async () => {
    const root = tempDir();
    writeFileSync(path.join(root, "file.jpg"), "x");
    expect(await checkMediaLibraryFolder(root)).toBeNull();
    expect(await checkMediaLibraryFolder("photos")).toBe("Use an absolute folder path.");
    expect(await checkMediaLibraryFolder(path.join(root, "file.jpg"))).toBe(
      "This is not a folder.",
    );
    expect(await checkMediaLibraryFolder(path.join(root, "missing"))).toBe("Folder not found.");
  });
});