import sharp from 'sharp';

import fs from 'fs';

import path from 'path';

import sizeOf from 'image-size';

import { fileURLToPath } from 'url';

const containerHeight = 180;

const containerWidth = 273;

const __filename = fileURLToPath(import.meta.url);

const __dirname = path.dirname(__filename);

const fullSizeDir = path.join(__dirname, '../static', 'img', 'blogposts', 'full-size-images');

const reducedSizeDir = path.join(__dirname, '../static', 'img', 'blogposts', 'resized-images');

if (!fs.existsSync(reducedSizeDir)) {

fs.mkdirSync(reducedSizeDir, { recursive: true });

}

function calculateImageSize(fullSizePath) {

if (fs.existsSync(fullSizePath)) {

const width = sizeOf(fullSizePath).width;

const height = sizeOf(fullSizePath).height;

let targetWidth, targetHeight;

if (width * containerHeight > containerWidth * height) {

targetWidth = containerWidth * 2;

targetHeight = Math.round(targetWidth / width * height);

if (targetHeight > containerHeight) {

targetHeight = containerHeight;

targetWidth = Math.round(targetHeight * width / height);

}

}

else {

targetHeight = containerHeight;

targetWidth = Math.round(targetHeight * width / height);

}

return [targetWidth, targetHeight];

}

}

fs.readdirSync(fullSizeDir).forEach((file) => {

const fullSizePath = path.join(fullSizeDir, file);

const reducedSizePath = path.join(reducedSizeDir, file);

const [targetWidth, targetHeight] = calculateImageSize(fullSizePath);

if (/\.(png|jpg)$/i.test(file)) {

sharp(fullSizePath)

.resize(targetWidth, targetHeight)

.toFile(reducedSizePath)

}

})