/**
 * Pure-function tests for the logo sharp pipeline (no DB / storage).
 * The `setPortLogo` write-path is exercised by integration tests + Playwright.
 */

import { describe, expect, it } from 'vitest';
import sharp from 'sharp';

import { processLogoUpload } from '@/lib/services/logo.service';

async function makePng(
  w: number,
  h: number,
  color: { r: number; g: number; b: number; alpha: number } = { r: 255, g: 0, b: 0, alpha: 1 },
) {
  return sharp({ create: { width: w, height: h, channels: 4, background: color } })
    .png()
    .toBuffer();
}

describe('processLogoUpload - sharp pipeline', () => {
  it('accepts a healthy PNG with alpha and resizes if needed', async () => {
    const buf = await makePng(2400, 800);
    const result = await processLogoUpload(buf);
    expect(result.originalFormat).toBe('png');
    expect(result.finalDimensions.width).toBeLessThanOrEqual(1200);
    expect(result.finalDimensions.height).toBeLessThanOrEqual(1200);
    expect(result.pngBuffer.subarray(1, 4).toString('ascii')).toBe('PNG');
    expect(result.warnings).toContain('trimmed');
    expect(result.warnings).toContain('resized');
  });

  it('rejects undersized images', async () => {
    const buf = await makePng(100, 100);
    await expect(processLogoUpload(buf)).rejects.toThrow(/too small/i);
  });

  it('rejects empty buffers', async () => {
    await expect(processLogoUpload(Buffer.alloc(0))).rejects.toThrow(/empty/i);
  });

  it('rejects buffers that exceed the raw size cap', async () => {
    // 6 MB of zero bytes - fails the raw size cap before sharp parses.
    const buf = Buffer.alloc(6 * 1024 * 1024);
    await expect(processLogoUpload(buf)).rejects.toThrow(/MB/i);
  });

  it('rejects non-image bytes', async () => {
    const buf = Buffer.from('this is not an image at all');
    await expect(processLogoUpload(buf)).rejects.toThrow(/supported image format/i);
  });

  it('rejects out-of-bounds crop coordinates', async () => {
    const buf = await makePng(800, 800);
    await expect(processLogoUpload(buf, { x: 0, y: 0, width: 1000, height: 1000 })).rejects.toThrow(
      /out of image bounds/i,
    );
  });

  it('accepts an in-bounds crop', async () => {
    const buf = await makePng(800, 800);
    const result = await processLogoUpload(buf, { x: 100, y: 100, width: 500, height: 500 });
    expect(result.finalDimensions.width).toBeGreaterThan(0);
  });

  it('rasterizes SVG input to PNG', async () => {
    const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400" viewBox="0 0 400 400">
      <rect width="400" height="400" fill="#1d4ed8"/>
      <circle cx="200" cy="200" r="100" fill="#ffffff"/>
    </svg>`;
    const buf = Buffer.from(svg, 'utf8');
    const result = await processLogoUpload(buf);
    expect(result.originalFormat).toBe('svg');
    expect(result.warnings).toContain('svg-rasterized');
    // Output is PNG even though input was SVG.
    expect(result.pngBuffer.subarray(1, 4).toString('ascii')).toBe('PNG');
  });

  it('rejects SVG with embedded script', async () => {
    const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400">
      <script>alert('xss')</script>
      <rect width="400" height="400" fill="#1d4ed8"/>
    </svg>`;
    const buf = Buffer.from(svg, 'utf8');
    await expect(processLogoUpload(buf)).rejects.toThrow(/disallowed nodes/i);
  });

  it('rejects SVG with external href', async () => {
    const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400">
      <image href="https://evil.example.com/x.png" width="400" height="400"/>
    </svg>`;
    const buf = Buffer.from(svg, 'utf8');
    await expect(processLogoUpload(buf)).rejects.toThrow(/disallowed nodes/i);
  });

  it('flags JPEG sources with no alpha', async () => {
    const buf = await sharp({
      create: { width: 1200, height: 1200, channels: 3, background: { r: 200, g: 50, b: 50 } },
    })
      .jpeg({ quality: 80 })
      .toBuffer();
    const result = await processLogoUpload(buf);
    expect(result.warnings).toContain('jpeg-source');
    expect(result.warnings).toContain('no-alpha');
  });
});