"use strict";

/*
This module is derived from: css-loader (https://github.com/webpack-contrib/css-loader)
	(c) JS Foundation and other contributors

Modifications by:
	(c) 2019, Sven Slootweg <admin@cryto.net>

Licensed under:
	MIT (https://opensource.org/licenses/MIT)
*/

const icssUtils = require("icss-utils");
const loaderUtils = require("loader-utils");

const pluginName = 'postcss-icss-find-imports';

module.exports = function (_options = {}) {
	return {
		postcssPlugin: pluginName,
		Once: (root, { result }) => {
			let discoveredImports = new Set();
			
			let { icssImports } = icssUtils.extractICSS(root, false);
			
			for (let importUrl of Object.keys(icssImports)) {
				discoveredImports.add(loaderUtils.parseString(importUrl));
			}
			
			for (let url of discoveredImports) {
				result.messages.push({
					pluginName: pluginName,
					type: "import",
					url: url
				});
			}
		}
	};
};

module.exports.postcss = true;