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/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

const concord = require("./concord");
const DescriptionFileUtils = require("./DescriptionFileUtils");
const forEachBail = require("./forEachBail");

module.exports = class ConcordExtensionsPlugin {
	constructor(source, options, target) {
		this.source = source;
		this.options = options;
		this.target = target;
	}

	apply(resolver) {
		const target = resolver.ensureHook(this.target);
		resolver
			.getHook(this.source)
			.tapAsync(
				"ConcordExtensionsPlugin",
				(request, resolveContext, callback) => {
					const concordField = DescriptionFileUtils.getField(
						request.descriptionFileData,
						"concord"
					);
					if (!concordField) return callback();
					const extensions = concord.getExtensions(
						request.context,
						concordField
					);
					if (!extensions) return callback();
					forEachBail(
						extensions,
						(appending, callback) => {
							const obj = Object.assign({}, request, {
								path: request.path + appending,
								relativePath:
									request.relativePath && request.relativePath + appending
							});
							resolver.doResolve(
								target,
								obj,
								"concord extension: " + appending,
								resolveContext,
								callback
							);
						},
						(err, result) => {
							if (err) return callback(err);

							// Don't allow other processing
							if (result === undefined) return callback(null, null);
							callback(null, result);
						}
					);
				}
			);
	}
};