import sharp from 'sharp';
import { readdir, rename, unlink } from 'node:fs/promises';
import { join, resolve } from 'node:path';

const iconDirectory = resolve('./static');
const iconFiles = (await readdir(iconDirectory))
  .filter((file) => file.toLocaleLowerCase().endsWith('.png'))
  .sort((left, right) => left.localeCompare(right));

for (const file of iconFiles) {
  const source = join(iconDirectory, file);
  const temporary = join(iconDirectory, `.${file}.trimmed`);
  const before = await sharp(source).metadata();

  try {
    const result = await sharp(source)
      .trim({ background: { r: 0, g: 0, b: 0, alpha: 0 } })
      .extend({
        top: 2,
        right: 2,
        bottom: 2,
        left: 2,
        background: { r: 0, g: 0, b: 0, alpha: 0 },
      })
      .png({ compressionLevel: 9, adaptiveFiltering: true })
      .toFile(temporary);

    if (!result.width || !result.height || result.channels !== 4) {
      throw new Error(`${file} did not produce a valid transparent RGBA icon.`);
    }

    await rename(temporary, source);
    console.log(
      `${file}: ${before.width}x${before.height} -> ${result.width}x${result.height}`,
    );
  } catch (error) {
    await unlink(temporary).catch(() => {});
    throw error;
  }
}

console.log(
  `Trimmed ${iconFiles.length} static PNG icons with a 2px transparent safety margin.`,
);