import adapter from '@sveltejs/adapter-static';
import { vitePreprocess } from '@sveltejs/kit/vite';
import {mdsvex} from "mdsvex";

function escapeBraces(unsafe)
{
	return unsafe
		.replace(/{/g, "{")
		.replace(/}/g, "}");
}

function highlighter(code, lang) {
	// Lang can be:
	// just the lang ('rust')
	// the lang, then in brackets lines to hightlight ('rust[1-5,9,21-23]')

	let params = new URLSearchParams(lang.split('?')[1]);
	let real_lang = lang.split('?')[0];

	let classes = [`language-${real_lang}`];
	let props = "";

	if (params.has("lines")) {
		props += `data-line="${params.get("lines")}" `;
	}
	if (params.has("src")) {
		props += `data-src="${params.get("src")}" `;
	}
	if (params.has("enableDownload")) {
		props += "data-download-link ";
	}
	if (params.has("downloadLabel")) {
		props += `data-download-link-label="${params.get("downloadLabel")}" `;
	}

	return `<pre class="rainbow-braces diff-highlight line-numbers match-braces ${classes}" ${props}><code class="language-${real_lang}" ${props}>${escapeBraces(code)}</code></pre>`
}

/** @type {import('@sveltejs/kit').Config} */
const config = {
	// Consult https://kit.svelte.dev/docs/integrations#preprocessors
	// for more information about preprocessors
	preprocess: [
		vitePreprocess(),
		mdsvex({
			extensions: ['.svx'],
			layout: './src/lib/PostLayout.svelte',
			highlight: {
				highlighter
			}
		})
	],

	extensions: ['.svelte', '.svx'],

	kit: {
		// adapter-auto only supports some environments, see https://kit.svelte.dev/docs/adapter-auto for a list.
		// If your environment is not supported or you settled on a specific environment, switch out the adapter.
		// See https://kit.svelte.dev/docs/adapters for more information about adapters.
		adapter: adapter(),
		alias: {
			"$components": "src/components"
		}
	}
};

export default config;