const path = require("path");
const eleventyImage = require("@11ty/eleventy-img");

module.exports = eleventyConfig => {
	function relativeToInputPath(inputPath, relativeFilePath) {
		let split = inputPath.split("/");
		split.pop();

		return path.resolve(split.join(path.sep), relativeFilePath);
	}

	// Eleventy Image shortcode
	// https://www.11ty.dev/docs/plugins/image/
	eleventyConfig.addAsyncShortcode("image", async function imageShortcode(src, alt, sizes) {
		let file = relativeToInputPath(this.page.inputPath, src);
		let metadata = await eleventyImage(file, {
			widths: ["auto"],
			// You can add "avif" or "jpeg" here if you’d like!
			formats: ["webp", "png"],
			outputDir: path.join(eleventyConfig.dir.output, "img"), // Advanced usage note: `eleventyConfig.dir` works here because we’re using addPlugin.
		});
		let imageAttributes = {
			alt,
			sizes,
			loading: "lazy",
			decoding: "async",
		};
		return eleventyImage.generateHTML(metadata, imageAttributes);
	});
};