'use strict';

/**
 * Crops the month plates in src/images/ (removes the paper margin, the thin
 * frame and the printed caption) and writes web-sized JPGs to
 * public/assets/months/<monthKey>.jpg.
 *
 * Not a project dependency: run with `npm i --no-save sharp && node scripts/prepare-images.cjs`.
 */

const fs = require('node:fs');
const path = require('node:path');
const sharp = require('sharp');

const SRC_DIR = path.join(__dirname, '..', 'src', 'images');
const OUT_DIR = path.join(__dirname, '..', 'public', 'assets', 'months');

// Pixels to remove around the engraving (the scans differ by a few pixels in width).
const CROP = { left: 62, top: 62, right: 66, bottom: 225 };
const OUTPUT_WIDTH = 560;

async function main() {
  fs.mkdirSync(OUT_DIR, { recursive: true });
  for (const file of fs.readdirSync(SRC_DIR).filter((name) => name.endsWith('.jpg'))) {
    const source = path.join(SRC_DIR, file);
    const { width, height } = await sharp(source).metadata();
    await sharp(source)
      .extract({
        left: CROP.left,
        top: CROP.top,
        width: width - CROP.left - CROP.right,
        height: height - CROP.top - CROP.bottom,
      })
      .resize({ width: OUTPUT_WIDTH })
      .jpeg({ quality: 80, mozjpeg: true })
      .toFile(path.join(OUT_DIR, file.toLowerCase()));
  }
}

main();