import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import fs from 'node:fs/promises';
import path from 'node:path';
import os from 'node:os';
import sharp from 'sharp';
import { registerIcoConverter, encodeIcoFromInput, DEFAULT_ICON_SIZE } from '../../src/converters/ico.js';
import { resolve, listTargetFormats } from '../../src/converters/registry.js';
import { detectInputMime } from '../../src/mime.js';

let tmpDir;

beforeAll(async () => {
  registerIcoConverter();
  tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'converter-ico-'));
});

afterAll(async () => {
  await fs.rm(tmpDir, { recursive: true, force: true });
});

describe('ICO converter registration', () => {
  it('registers ico as both a source and a target for every image format', () => {
    expect(listTargetFormats('ico')).toContain('png');
    expect(listTargetFormats('ico')).toContain('jpg');
    expect(listTargetFormats('png')).toContain('ico');
    expect(listTargetFormats('jpg')).toContain('ico');
  });
});

describe('encodeIcoFromInput', () => {
  it('defaults to a 256x256 icon when no size is given', async () => {
    const inputPath = path.join(import.meta.dirname, '..', 'fixtures', 'sample.png');
    const icoBuffer = await encodeIcoFromInput(inputPath);

    const outputPath = path.join(tmpDir, 'default-size.ico');
    await fs.writeFile(outputPath, icoBuffer);
    const detected = await detectInputMime(outputPath);
    expect(detected.mime).toBe('image/x-icon');
  });

  it('produces an icon at the requested size', async () => {
    const inputPath = path.join(import.meta.dirname, '..', 'fixtures', 'sample.png');
    const icoBuffer = await encodeIcoFromInput(inputPath, 32);

    const { decodeIco } = await import('icojs');
    const [image] = await decodeIco(icoBuffer, 'image/png');
    expect(image.width).toBe(32);
    expect(image.height).toBe(32);
  });
});

describe('ico -> image conversion', () => {
  it('converts an ICO fixture to PNG, picking the largest embedded image', async () => {
    const source = path.join(import.meta.dirname, '..', 'fixtures', 'sample.png');
    const icoPath = path.join(tmpDir, 'multi.ico');

    const small = await sharp(source).resize(16, 16).png().toBuffer();
    const large = await sharp(source).resize(48, 48).png().toBuffer();
    const { encodeIco } = await import('icojs');
    await fs.writeFile(icoPath, Buffer.from(await encodeIco([{ buffer: small }, { buffer: large }])));

    const outputPath = path.join(tmpDir, 'from-ico.png');
    const entry = resolve('ico', 'png');
    await entry.convert(icoPath, outputPath);

    const meta = await sharp(outputPath).metadata();
    expect(meta.width).toBe(48);
    expect(meta.height).toBe(48);
  });
});

describe('image -> ico conversion', () => {
  it('converts a PNG fixture to a valid ICO at the requested size', async () => {
    const inputPath = path.join(import.meta.dirname, '..', 'fixtures', 'sample.png');
    const outputPath = path.join(tmpDir, 'output.ico');
    const entry = resolve('png', 'ico');

    await entry.convert(inputPath, outputPath, { iconSize: 48 });

    const detected = await detectInputMime(outputPath);
    expect(detected.mime).toBe('image/x-icon');

    const { decodeIco } = await import('icojs');
    const [image] = await decodeIco(await fs.readFile(outputPath), 'image/png');
    expect(image.width).toBe(48);
  });

  it('defaults to 256px when no iconSize is given', async () => {
    const inputPath = path.join(import.meta.dirname, '..', 'fixtures', 'sample.png');
    const outputPath = path.join(tmpDir, 'output-default.ico');
    const entry = resolve('png', 'ico');

    await entry.convert(inputPath, outputPath);

    const { decodeIco } = await import('icojs');
    const [image] = await decodeIco(await fs.readFile(outputPath), 'image/png');
    expect(image.width).toBe(DEFAULT_ICON_SIZE);
  });
});