/**
 * Integration tests for the bulk-rename tool (/api/v1/tools/bulk-rename).
 *
 * Covers pattern-based renaming with {{index}}, {{padded}}, {{original}}
 * placeholders, custom start index, ZIP response format, and input validation.
 */

import { readFileSync } from "node:fs";
import { join } from "node:path";
import AdmZip from "adm-zip";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import { buildTestApp, createMultipartPayload, loginAsAdmin, type TestApp } from "./test-server.js";

const FIXTURES = join(__dirname, "..", "fixtures");
const PNG = readFileSync(join(FIXTURES, "test-200x150.png"));
const JPG = readFileSync(join(FIXTURES, "test-100x100.jpg"));
const WEBP = readFileSync(join(FIXTURES, "test-50x50.webp"));
const TINY_PNG = readFileSync(join(FIXTURES, "test-1x1.png"));
const SVG = readFileSync(join(FIXTURES, "test-100x100.svg"));
const GIF = readFileSync(join(FIXTURES, "animated.gif"));

/** Extract sorted filenames from a ZIP buffer. */
function zipEntryNames(buf: Buffer): string[] {
  const zip = new AdmZip(buf);
  return zip
    .getEntries()
    .map((e) => e.entryName)
    .sort();
}

let testApp: TestApp;
let app: TestApp["app"];
let adminToken: string;

beforeAll(async () => {
  testApp = await buildTestApp();
  app = testApp.app;
  adminToken = await loginAsAdmin(app);
}, 30_000);

afterAll(async () => {
  await testApp.cleanup();
}, 10_000);

describe("Bulk Rename", () => {
  it("renames files using the default pattern and returns a ZIP", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "photo.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "pic.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({}) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    expect(res.headers["content-type"]).toBe("application/zip");

    const filenames = zipEntryNames(res.rawPayload);

    // Default pattern is "image-{{index}}", starting at 1
    expect(filenames).toHaveLength(2);
    expect(filenames).toContain("image-1.png");
    expect(filenames).toContain("image-2.jpg");
  });

  it("renames files using a custom pattern with {{index}}", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({ pattern: "photo-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);

    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("photo-1.png");
    expect(filenames).toContain("photo-2.jpg");
  });

  it("renames files using {{padded}} placeholder", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "file", filename: "c.webp", contentType: "image/webp", content: WEBP },
      { name: "settings", content: JSON.stringify({ pattern: "img-{{padded}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);

    const filenames = zipEntryNames(res.rawPayload);

    // 3 files starting at 1, max index is 3 => 1 char pad
    expect(filenames).toContain("img-1.png");
    expect(filenames).toContain("img-2.jpg");
    expect(filenames).toContain("img-3.webp");
  });

  it("renames files using {{original}} placeholder", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "sunset.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "beach.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({ pattern: "backup-{{original}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);

    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("backup-sunset.png");
    expect(filenames).toContain("backup-beach.jpg");
  });

  it("respects custom startIndex", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({ pattern: "file-{{index}}", startIndex: 10 }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);

    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("file-10.png");
    expect(filenames).toContain("file-11.jpg");
  });

  it("preserves file content after rename", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "test.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "renamed-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);

    const zip = new AdmZip(res.rawPayload);
    const entry = zip.getEntry("renamed-1.png");
    expect(entry).not.toBeNull();

    const content = entry?.getData();
    expect(content.length).toBe(PNG.length);
    expect(content.equals(PNG)).toBe(true);
  });

  // ── Validation ──────────────────────────────────────────────────────

  it("rejects requests with no files", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "settings", content: JSON.stringify({ pattern: "file-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(400);
    const result = JSON.parse(res.body);
    expect(result.error).toMatch(/no files/i);
  });

  it("rejects unauthenticated requests", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "test.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({}) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: { "content-type": contentType },
      body,
    });

    expect(res.statusCode).toBe(401);
  });

  // ── Pattern combinations ──────────────────────────────────────

  it("combines {{original}} and {{index}} in one pattern", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "moon.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "star.jpg", contentType: "image/jpeg", content: JPG },
      {
        name: "settings",
        content: JSON.stringify({ pattern: "{{original}}-{{index}}" }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("moon-1.png");
    expect(filenames).toContain("star-2.jpg");
  });

  it("renames a single file correctly", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "solo.png", contentType: "image/png", content: PNG },
      {
        name: "settings",
        content: JSON.stringify({ pattern: "renamed-{{index}}" }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    expect(filenames).toContain("renamed-1.png");
  });

  it("handles many files with padded indices", async () => {
    // Use 10 files (the MAX_BATCH_SIZE in test env) to trigger wider padding
    const files = [];
    for (let i = 0; i < 10; i++) {
      files.push({
        name: "file",
        filename: `img${i}.png`,
        contentType: "image/png",
        content: PNG,
      });
    }
    files.push({
      name: "settings",
      content: JSON.stringify({ pattern: "photo-{{padded}}" }),
    });

    const { body, contentType } = createMultipartPayload(files);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(10);
    // With 10 files, padded index 1 should be "01"
    expect(filenames).toContain("photo-01.png");
    expect(filenames).toContain("photo-10.png");
  });

  it("preserves different file extensions per file", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "file", filename: "c.webp", contentType: "image/webp", content: WEBP },
      { name: "settings", content: JSON.stringify({ pattern: "output-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("output-1.png");
    expect(filenames).toContain("output-2.jpg");
    expect(filenames).toContain("output-3.webp");
  });

  it("skips empty file buffers (zero-length files)", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "real.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "empty.png", contentType: "image/png", content: Buffer.alloc(0) },
      { name: "settings", content: JSON.stringify({ pattern: "item-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    // Empty file is skipped, so only 1 file should be in the ZIP
    expect(filenames).toHaveLength(1);
    expect(filenames).toContain("item-1.png");
  });

  it("returns 400 for invalid settings JSON", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "test.png", contentType: "image/png", content: PNG },
      { name: "settings", content: "not-json{{{" },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(400);
    const result = JSON.parse(res.body);
    expect(result.error).toMatch(/json/i);
  });

  it("returns 400 for invalid settings values", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "test.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "", startIndex: -1 }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(400);
    const result = JSON.parse(res.body);
    expect(result.error).toMatch(/invalid settings/i);
  });

  it("handles files with no extension", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "noext", contentType: "application/octet-stream", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "renamed-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    // No extension to preserve
    expect(filenames[0]).toBe("renamed-1");
  });

  it("handles startIndex of 0", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "x.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "y.jpg", contentType: "image/jpeg", content: JPG },
      {
        name: "settings",
        content: JSON.stringify({ pattern: "zero-{{index}}", startIndex: 0 }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("zero-0.png");
    expect(filenames).toContain("zero-1.jpg");
  });

  // ── Content-disposition header ──────────────────────────────────

  it("returns correct content-disposition header", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "out-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    expect(res.headers["content-disposition"]).toMatch(/^attachment; filename="renamed-/);
  });

  // ── Pattern with no placeholders ────────────────────────────────

  it("renames with a static pattern (no placeholders)", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({ pattern: "static-name" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(2);
    // Both will have the same base name but different extensions
    expect(filenames).toContain("static-name.png");
    expect(filenames).toContain("static-name.jpg");
  });

  // ── All three placeholders together ─────────────────────────────

  it("uses all three placeholders in one pattern", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "photo.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "snap.jpg", contentType: "image/jpeg", content: JPG },
      {
        name: "settings",
        content: JSON.stringify({
          pattern: "{{original}}-{{index}}-{{padded}}",
        }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("photo-1-1.png");
    expect(filenames).toContain("snap-2-2.jpg");
  });

  // ── Large startIndex ────────────────────────────────────────────

  it("handles large startIndex (1000)", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      {
        name: "settings",
        content: JSON.stringify({ pattern: "file-{{padded}}", startIndex: 1000 }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("file-1000.png");
  });

  // ── HEIC file handling in rename ────────────────────────────────

  it("renames HEIC files preserving extension", { timeout: 120_000 }, async () => {
    const HEIC = readFileSync(join(FIXTURES, "test-200x150.heic"));
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "photo.heic", contentType: "image/heic", content: HEIC },
      { name: "settings", content: JSON.stringify({ pattern: "renamed-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("renamed-1.heic");
  });

  // ── Single file with padded index ───────────────────────────────

  it("single file uses no padding for padded placeholder", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "solo.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "solo-{{padded}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    expect(filenames[0]).toBe("solo-1.png");
  });

  // ── HEIF file handling ─────────────────────────────────────────

  it("renames HEIF files preserving extension", { timeout: 120_000 }, async () => {
    const HEIF = readFileSync(join(FIXTURES, "formats", "sample.heif"));
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "photo.heif", contentType: "image/heif", content: HEIF },
      { name: "settings", content: JSON.stringify({ pattern: "renamed-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("renamed-1.heif");
  });

  // ── Large file handling ────────────────────────────────────────

  it("renames a large stress image preserving content", async () => {
    const LARGE = readFileSync(join(FIXTURES, "content", "stress-large.jpg"));
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "big.jpg", contentType: "image/jpeg", content: LARGE },
      { name: "settings", content: JSON.stringify({ pattern: "large-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("large-1.jpg");

    const zip = new AdmZip(res.rawPayload);
    const entry = zip.getEntry("large-1.jpg");
    expect(entry).not.toBeNull();
    expect(entry?.getData().length).toBe(LARGE.length);
  });

  // ── Tiny file handling ─────────────────────────────────────────

  it("renames a 1x1 pixel image", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "tiny.png", contentType: "image/png", content: TINY_PNG },
      { name: "settings", content: JSON.stringify({ pattern: "small-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("small-1.png");
  });

  // ── SVG file handling ──────────────────────────────────────────

  it("renames SVG files preserving extension", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "icon.svg", contentType: "image/svg+xml", content: SVG },
      { name: "settings", content: JSON.stringify({ pattern: "vector-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("vector-1.svg");
  });

  // ── Animated GIF handling ──────────────────────────────────────

  it("renames animated GIF files preserving extension", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "animation.gif", contentType: "image/gif", content: GIF },
      { name: "settings", content: JSON.stringify({ pattern: "anim-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("anim-1.gif");
  });

  // ── Mixed format batch (5+ files) ─────────────────────────────

  it("renames a batch of 5+ mixed format files", async () => {
    const HEIC = readFileSync(join(FIXTURES, "test-200x150.heic"));
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "file", filename: "c.webp", contentType: "image/webp", content: WEBP },
      { name: "file", filename: "d.gif", contentType: "image/gif", content: GIF },
      { name: "file", filename: "e.svg", contentType: "image/svg+xml", content: SVG },
      { name: "file", filename: "f.heic", contentType: "image/heic", content: HEIC },
      { name: "settings", content: JSON.stringify({ pattern: "batch-{{padded}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(6);
    expect(filenames).toContain("batch-1.png");
    expect(filenames).toContain("batch-2.jpg");
    expect(filenames).toContain("batch-3.webp");
    expect(filenames).toContain("batch-4.gif");
    expect(filenames).toContain("batch-5.svg");
    expect(filenames).toContain("batch-6.heic");
  });

  // ── Pattern with special characters ───────────────────────────

  it("handles pattern with hyphens and underscores", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      {
        name: "settings",
        content: JSON.stringify({ pattern: "my_photo-set_{{index}}" }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("my_photo-set_1.png");
    expect(filenames).toContain("my_photo-set_2.jpg");
  });

  // ── Only empty files provided ─────────────────────────────────

  it("returns 400 when all files are empty (zero-length)", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: Buffer.alloc(0) },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: Buffer.alloc(0) },
      { name: "settings", content: JSON.stringify({ pattern: "file-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(400);
    const result = JSON.parse(res.body);
    expect(result.error).toMatch(/no files/i);
  });

  // ── Padded placeholder with startIndex ────────────────────────

  it("padded placeholder pads relative to total count plus startIndex", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      {
        name: "settings",
        content: JSON.stringify({ pattern: "img-{{padded}}", startIndex: 99 }),
      },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(2);
    // startIndex=99, 2 files => indices 99,100 => max is 101 (length 3)
    expect(filenames).toContain("img-099.png");
    expect(filenames).toContain("img-100.jpg");
  });

  // ── Double extension filename ─────────────────────────────────

  it("preserves only last extension for double-extension filenames", async () => {
    const { body, contentType } = createMultipartPayload([
      {
        name: "file",
        filename: "photo.backup.png",
        contentType: "image/png",
        content: PNG,
      },
      { name: "settings", content: JSON.stringify({ pattern: "clean-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    // extname returns ".png" for "photo.backup.png"
    expect(filenames[0]).toBe("clean-1.png");
  });

  // ── Original placeholder with no-extension file ───────────────

  it("{{original}} uses full filename when no extension exists", async () => {
    const { body, contentType } = createMultipartPayload([
      {
        name: "file",
        filename: "noext",
        contentType: "application/octet-stream",
        content: PNG,
      },
      { name: "settings", content: JSON.stringify({ pattern: "copy-{{original}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    expect(filenames[0]).toBe("copy-noext");
  });

  // ── Large file content integrity ──────────────────────────────

  it("preserves content integrity for large file", async () => {
    const LARGE = readFileSync(join(FIXTURES, "content", "stress-large.jpg"));
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "big.jpg", contentType: "image/jpeg", content: LARGE },
      { name: "settings", content: JSON.stringify({ pattern: "verify-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const zip = new AdmZip(res.rawPayload);
    const entry = zip.getEntry("verify-1.jpg");
    expect(entry).not.toBeNull();
    expect(entry?.getData().equals(LARGE)).toBe(true);
  });

  // ── Pattern with only original placeholder ────────────────────

  it("pattern with only {{original}} keeps original names", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "alpha.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "beta.jpg", contentType: "image/jpeg", content: JPG },
      { name: "settings", content: JSON.stringify({ pattern: "{{original}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toContain("alpha.png");
    expect(filenames).toContain("beta.jpg");
  });

  // ── Tiny file rename ──────────────────────────────────────────

  it("renames tiny 1x1 image and preserves content", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "pixel.png", contentType: "image/png", content: TINY_PNG },
      { name: "settings", content: JSON.stringify({ pattern: "dot-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const zip = new AdmZip(res.rawPayload);
    const entry = zip.getEntry("dot-1.png");
    expect(entry).not.toBeNull();
    expect(entry?.getData().equals(TINY_PNG)).toBe(true);
  });

  // ── Default settings with no settings field ───────────────────

  it("uses default pattern when settings field is omitted", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "x.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "y.jpg", contentType: "image/jpeg", content: JPG },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(2);
    // Default pattern is "image-{{index}}" starting at 1
    expect(filenames).toContain("image-1.png");
    expect(filenames).toContain("image-2.jpg");
  });

  // ── ZIP response headers ──────────────────────────────────────

  it("returns correct content-type header for ZIP", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({}) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    expect(res.headers["content-type"]).toBe("application/zip");
  });

  // ── Special characters in original filenames ──────────────────

  it("handles original filenames with spaces using {{original}}", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "my photo.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "{{original}}-copy" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    // The filename should contain the original name (possibly sanitized)
    expect(filenames[0]).toMatch(/\.png$/);
  });

  it("handles original filenames with unicode characters", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "foto.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "{{original}}-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    expect(filenames[0]).toMatch(/\.png$/);
  });

  // ── Unknown placeholder passes through as literal ────────────

  it("treats unknown placeholders as literal text", async () => {
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: "file-{{date}}-{{index}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
    // {{date}} is not a recognized placeholder, so it stays literal
    expect(filenames[0]).toContain("{{date}}");
    expect(filenames[0]).toContain("-1.png");
  });

  // ── Content verification for batch of 5+ files ──────────────

  it("batch of 6 files preserves all content and extensions", async () => {
    const HEIC = readFileSync(join(FIXTURES, "test-200x150.heic"));
    const LARGE = readFileSync(join(FIXTURES, "content", "stress-large.jpg"));
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "a.png", contentType: "image/png", content: PNG },
      { name: "file", filename: "b.jpg", contentType: "image/jpeg", content: JPG },
      { name: "file", filename: "c.webp", contentType: "image/webp", content: WEBP },
      { name: "file", filename: "d.gif", contentType: "image/gif", content: GIF },
      { name: "file", filename: "e.svg", contentType: "image/svg+xml", content: SVG },
      { name: "file", filename: "f.png", contentType: "image/png", content: TINY_PNG },
      { name: "settings", content: JSON.stringify({ pattern: "export-{{padded}}" }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(6);

    // Verify all extensions are preserved
    const extensions = filenames.map((f) => f.split(".").pop());
    expect(extensions).toContain("png");
    expect(extensions).toContain("jpg");
    expect(extensions).toContain("webp");
    expect(extensions).toContain("gif");
    expect(extensions).toContain("svg");

    // Verify content integrity for the first file
    const zip = new AdmZip(res.rawPayload);
    const firstEntry = zip.getEntry("export-1.png");
    expect(firstEntry).not.toBeNull();
    expect(firstEntry?.getData().equals(PNG)).toBe(true);
  });

  // ── Very long pattern ───────────────────────────────────────

  it("handles a long pattern name", async () => {
    const longPattern = "a".repeat(100) + "-{{index}}";
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "test.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: longPattern }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(200);
    const filenames = zipEntryNames(res.rawPayload);
    expect(filenames).toHaveLength(1);
  });

  // ── Pattern at max length boundary ──────────────────────────

  it("rejects pattern exceeding max length (1001 chars)", async () => {
    const tooLong = "x".repeat(1001);
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: "test.png", contentType: "image/png", content: PNG },
      { name: "settings", content: JSON.stringify({ pattern: tooLong }) },
    ]);

    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/bulk-rename",
      headers: {
        authorization: `Bearer ${adminToken}`,
        "content-type": contentType,
      },
      body,
    });

    expect(res.statusCode).toBe(400);
  });
});