const sharp = require('sharp');
const fs = require('fs');
const os = require('os');
const path = require('path');
const ImageOperations = require('../../src/main/ImageOperations');

describe('ImageOperations', () => {
  let tmpDir, inputPath;
  beforeEach(async () => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'imgops_'));
    inputPath = path.join(tmpDir, 'in.png');
    await sharp({
      create: { width: 100, height: 100, channels: 3, background: { r: 255, g: 0, b: 0 } },
    })
      .png()
      .toFile(inputPath);
  });
  afterEach(() => fs.rmSync(tmpDir, { recursive: true, force: true }));

  test('imageConvert converts PNG to JPEG', async () => {
    const outputPath = path.join(tmpDir, 'out.jpg');
    const result = await ImageOperations.imageConvert({ inputPath, outputPath, format: 'jpeg' });
    expect(result.success).toBe(true);
    expect(fs.existsSync(outputPath)).toBe(true);
    const meta = await sharp(outputPath).metadata();
    expect(meta.format).toBe('jpeg');
  });

  test('imageResize resizes to given width preserving aspect', async () => {
    const outputPath = path.join(tmpDir, 'out.png');
    await ImageOperations.imageResize({
      inputPath,
      outputPath,
      width: 50,
      height: null,
      fit: 'inside',
    });
    const meta = await sharp(outputPath).metadata();
    expect(meta.width).toBe(50);
  });

  test('imageRotate rotates by given angle', async () => {
    const outputPath = path.join(tmpDir, 'out.png');
    await ImageOperations.imageRotate({ inputPath, outputPath, angle: 90 });
    const meta = await sharp(outputPath).metadata();
    expect(meta.width).toBe(100); // 90deg on square stays square
  });

  test('imageCompress produces a smaller or equal-size JPEG at low quality', async () => {
    const jpegPath = path.join(tmpDir, 'in.jpg');
    await sharp(inputPath).jpeg({ quality: 100 }).toFile(jpegPath);
    const outputPath = path.join(tmpDir, 'compressed.jpg');
    await ImageOperations.imageCompress({ inputPath: jpegPath, outputPath, quality: 10 });
    expect(fs.statSync(outputPath).size).toBeLessThanOrEqual(fs.statSync(jpegPath).size);
  });

  test('executeOperation dispatches to the correct function', async () => {
    const outputPath = path.join(tmpDir, 'out.png');
    const result = await ImageOperations.executeOperation('rotate', {
      inputPath,
      outputPath,
      angle: 180,
    });
    expect(result.success).toBe(true);
  });

  test('unknown operation throws', async () => {
    await expect(ImageOperations.executeOperation('bogus', {})).rejects.toThrow();
  });
});

describe('ImageOperations when sharp fails to load (boot resilience)', () => {
  // Reproduces the packaged-deb crash: the native @img/sharp-* bindings are
  // missing/pruned, so require('sharp') throws. Importing ImageOperations must
  // never crash the app at boot, and every operation must degrade honestly.
  const dlopenErrorMessage =
    'Could not load the "sharp" module using the linux-x64 runtime. ' +
    'ERR_DLOPEN_FAILED: libvips-cpp.so.8.17.3: cannot open shared object file ' +
    '(searched /opt/MarkdownConverter/resources/app.asar.unpacked/node_modules/@img/' +
    'sharp-linux-x64/lib, /opt/MarkdownConverter/resources/app.asar/node_modules/@img/' +
    'sharp-linux-x64/lib, ...)';

  let isolatedModule;

  beforeEach(() => {
    jest.resetModules();
    jest.doMock('sharp', () => {
      throw new Error(dlopenErrorMessage);
    });
    jest.isolateModules(() => {
      isolatedModule = require('../../src/main/ImageOperations');
    });
  });

  afterEach(() => {
    jest.dontMock('sharp');
  });

  test('requiring ImageOperations does not throw at import time', () => {
    expect(() => require('../../src/main/ImageOperations')).not.toThrow();
  });

  test("executeOperation('convert') resolves to an honest unavailable failure", async () => {
    const result = await isolatedModule.executeOperation('convert', {
      inputPath: '/tmp/imgops-resilience-in.png',
      outputPath: '/tmp/imgops-resilience-out.jpg',
      format: 'jpeg',
    });
    expect(result).toEqual({
      success: false,
      error: expect.stringContaining('Image operations unavailable'),
    });
  });

  test('the unavailable failure message carries no absolute paths', async () => {
    const result = await isolatedModule.executeOperation('rotate', {
      inputPath: '/tmp/imgops-resilience-in.png',
      outputPath: '/tmp/imgops-resilience-out.png',
      angle: 90,
    });
    expect(result.success).toBe(false);
    expect(result.error).not.toMatch(/\/opt\/|\/tmp\/|[A-Z]:\\/);
  });
});