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

"use strict";

const {
	compareModulesByPreOrderIndexOrIdentifier
} = require("../util/comparators");
const createSchemaValidation = require("../util/create-schema-validation");
const createHash = require("../util/createHash");
const { getUsedModuleIds, getFullModuleName } = require("./IdHelpers");

/** @typedef {import("../../declarations/plugins/HashedModuleIdsPlugin").HashedModuleIdsPluginOptions} HashedModuleIdsPluginOptions */

const validate = createSchemaValidation(
	require("../../schemas/plugins/HashedModuleIdsPlugin.check.js"),
	() => require("../../schemas/plugins/HashedModuleIdsPlugin.json"),
	{
		name: "Hashed Module Ids Plugin",
		baseDataPath: "options"
	}
);

class HashedModuleIdsPlugin {
	/**
	 * @param {HashedModuleIdsPluginOptions=} options options object
	 */
	constructor(options = {}) {
		validate(options);

		/** @type {HashedModuleIdsPluginOptions} */
		this.options = {
			context: null,
			hashFunction: "md4",
			hashDigest: "base64",
			hashDigestLength: 4,
			...options
		};
	}

	apply(compiler) {
		const options = this.options;
		compiler.hooks.compilation.tap("HashedModuleIdsPlugin", compilation => {
			compilation.hooks.moduleIds.tap("HashedModuleIdsPlugin", modules => {
				const chunkGraph = compilation.chunkGraph;
				const context = this.options.context
					? this.options.context
					: compiler.context;

				const usedIds = getUsedModuleIds(compilation);
				const modulesInNaturalOrder = Array.from(modules)
					.filter(m => {
						if (!m.needId) return false;
						if (chunkGraph.getNumberOfModuleChunks(m) === 0) return false;
						return chunkGraph.getModuleId(module) === null;
					})
					.sort(
						compareModulesByPreOrderIndexOrIdentifier(compilation.moduleGraph)
					);
				for (const module of modulesInNaturalOrder) {
					const ident = getFullModuleName(module, context, compiler.root);
					const hash = createHash(options.hashFunction);
					hash.update(ident || "");
					const hashId = /** @type {string} */ (
						hash.digest(options.hashDigest)
					);
					let len = options.hashDigestLength;
					while (usedIds.has(hashId.substr(0, len))) len++;
					const moduleId = hashId.substr(0, len);
					chunkGraph.setModuleId(module, moduleId);
					usedIds.add(moduleId);
				}
			});
		});
	}
}

module.exports = HashedModuleIdsPlugin;