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

const Template = require("./Template");
const ConstDependency = require("./dependencies/ConstDependency");
const ParserHelpers = require("./ParserHelpers");
const NullFactory = require("./NullFactory");

const REPLACEMENTS = {
	__webpack_hash__: "__webpack_require__.h", // eslint-disable-line camelcase
	__webpack_chunkname__: "__webpack_require__.cn" // eslint-disable-line camelcase
};
const REPLACEMENT_TYPES = {
	__webpack_hash__: "string", // eslint-disable-line camelcase
	__webpack_chunkname__: "string" // eslint-disable-line camelcase
};

class ExtendedAPIPlugin {
	apply(compiler) {
		compiler.hooks.compilation.tap("ExtendedAPIPlugin", (compilation, {
			normalModuleFactory
		}) => {
			compilation.dependencyFactories.set(ConstDependency, new NullFactory());
			compilation.dependencyTemplates.set(ConstDependency, new ConstDependency.Template());

			const mainTemplate = compilation.mainTemplate;
			mainTemplate.hooks.requireExtensions.tap("ExtendedAPIPlugin", (source, chunk, hash) => {
				const buf = [source];
				buf.push("");
				buf.push("// __webpack_hash__");
				buf.push(`${mainTemplate.requireFn}.h = ${JSON.stringify(hash)};`);
				buf.push("");
				buf.push("// __webpack_chunkname__");
				buf.push(`${mainTemplate.requireFn}.cn = ${JSON.stringify(chunk.name)};`);
				return Template.asString(buf);
			});
			mainTemplate.hooks.globalHash.tap("ExtendedAPIPlugin", () => true);

			const handler = (parser, parserOptions) => {
				Object.keys(REPLACEMENTS).forEach(key => {
					parser.hooks.expression.for(key).tap("ExtendedAPIPlugin", ParserHelpers.toConstantDependencyWithWebpackRequire(parser, REPLACEMENTS[key]));
					parser.hooks.evaluateTypeof.for(key).tap("ExtendedAPIPlugin", ParserHelpers.evaluateToString(REPLACEMENT_TYPES[key]));
				});
			};

			normalModuleFactory.hooks.parser.for("javascript/auto").tap("ExtendedAPIPlugin", handler);
			normalModuleFactory.hooks.parser.for("javascript/dynamic").tap("ExtendedAPIPlugin", handler);
			normalModuleFactory.hooks.parser.for("javascript/esm").tap("ExtendedAPIPlugin", handler);
		});
	}
}

module.exports = ExtendedAPIPlugin;