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

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const { equals } = require("../util/ArrayHelpers");
const makeSerializable = require("../util/makeSerializable");
const { propertyAccess } = require("../util/property");
const { isWorkerEntryThis } = require("./CommonJsDependencyHelpers");
const NullDependency = require("./NullDependency");

/** @import { ReplaceSource } from "webpack-sources" */
/**
 * @import Dependency, {
 * 	ReferencedExports,
 * 	UpdateHashContext,
 * 	ExportInfoName
 * } from "../Dependency"
 */
/** @import Hash from "../util/Hash" */
/** @import { DependencyTemplateContext } from "../DependencyTemplate" */
/** @import ModuleGraph from "../ModuleGraph" */
/** @import { Range } from "../javascript/JavascriptParser" */
/** @import { RuntimeSpec } from "../util/runtime" */
/**
 * @import {
 * 	CommonJSDependencyBaseKeywords
 * } from "./CommonJsDependencyHelpers"
 */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext<[Range, CommonJSDependencyBaseKeywords, ExportInfoName[], boolean]>} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext<[Range, CommonJSDependencyBaseKeywords, ExportInfoName[], boolean]>} ObjectSerializerContext */

class CommonJsSelfReferenceDependency extends NullDependency {
	/**
	 * Creates an instance of CommonJsSelfReferenceDependency.
	 * @param {Range} range range
	 * @param {CommonJSDependencyBaseKeywords} base base
	 * @param {ExportInfoName[]} names names
	 * @param {boolean} call is a call
	 */
	constructor(range, base, names, call) {
		super();
		this.range = range;
		/** @type {CommonJSDependencyBaseKeywords} */
		this.base = base;
		/** @type {string[]} */
		this.names = names;
		/** @type {boolean} */
		this.call = call;
	}

	get type() {
		return "cjs self exports reference";
	}

	get category() {
		return "self";
	}

	/**
	 * Returns true if this dependency can be concatenated
	 * @param {boolean} concatenateCommonJsModules whether optimization.concatenateModules.commonjs is enabled
	 * @returns {boolean} true if this dependency can be concatenated
	 */
	canConcatenate(concatenateCommonJsModules) {
		return concatenateCommonJsModules;
	}

	/**
	 * Returns an identifier to merge equal requests.
	 * @returns {string | null} an identifier to merge equal requests
	 */
	getResourceIdentifier() {
		return "self";
	}

	/**
	 * Returns list of exports referenced by this dependency
	 * @param {ModuleGraph} moduleGraph module graph
	 * @param {RuntimeSpec} runtime the runtime for which the module is analysed
	 * @returns {ReferencedExports} referenced exports
	 */
	getReferencedExports(moduleGraph, runtime) {
		return [this.call ? this.names.slice(0, -1) : this.names];
	}

	/**
	 * Updates the hash with the data contributed by this instance.
	 * @param {Hash} hash hash to be updated
	 * @param {UpdateHashContext} context context
	 * @returns {void}
	 */
	updateHash(hash, context) {
		// a classic worker entry generates `this` as the global scope, so it must
		// not share one code generation with a runtime that generates it as exports
		if (this.base !== "this") return;
		const { chunkGraph, runtime, runtimeTemplate } = context;
		const module = chunkGraph.moduleGraph.getParentModule(this);
		hash.update(
			module !== undefined &&
				isWorkerEntryThis(module, chunkGraph, runtime, runtimeTemplate)
				? "worker global"
				: "exports"
		);
	}

	/**
	 * Serializes this instance into the provided serializer context.
	 * @param {ObjectSerializerContext} context context
	 */
	serialize(context) {
		context
			.write(this.range)
			.write(this.base)
			.write(this.names)
			.write(this.call);
		super.serialize(context);
	}

	/**
	 * Restores this instance from the provided deserializer context.
	 * @param {ObjectDeserializerContext} context context
	 */
	deserialize(context) {
		this.range = context.read();
		const c1 = context.rest;
		this.base = c1.read();
		const c2 = c1.rest;
		this.names = c2.read();
		const c3 = c2.rest;
		this.call = c3.read();
		super.deserialize(c3.rest);
	}
}

makeSerializable(
	CommonJsSelfReferenceDependency,
	"webpack/lib/dependencies/CommonJsSelfReferenceDependency"
);

CommonJsSelfReferenceDependency.Template = class CommonJsSelfReferenceDependencyTemplate extends (
	NullDependency.Template
) {
	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {Dependency} dependency the dependency for which the template should be applied
	 * @param {ReplaceSource} source the current replace source which can be modified
	 * @param {DependencyTemplateContext} templateContext the context object
	 * @returns {void}
	 */
	apply(
		dependency,
		source,
		{
			module,
			moduleGraph,
			chunkGraph,
			runtime,
			runtimeRequirements,
			runtimeTemplate
		}
	) {
		const dep = /** @type {CommonJsSelfReferenceDependency} */ (dependency);
		// a classic worker entry reads its global scope, not an export, so the
		// names stay as written
		const isWorkerEntry =
			dep.base === "this" &&
			isWorkerEntryThis(module, chunkGraph, runtime, runtimeTemplate);
		// CJS exports are never inlined
		const used =
			isWorkerEntry || dep.names.length === 0
				? dep.names
				: /** @type {string | string[] | false} */ (
						moduleGraph.getExportsInfo(module).getUsedName(dep.names, runtime)
					);
		if (!used) {
			throw new Error(
				"Self-reference dependency has unused export name: This should not happen"
			);
		}

		/** @type {string} */
		let base;
		switch (dep.base) {
			case "exports":
				runtimeRequirements.add(RuntimeGlobals.exports);
				base = module.exportsArgument;
				break;
			case "module.exports":
				runtimeRequirements.add(RuntimeGlobals.module);
				base = `${module.moduleArgument}.exports`;
				break;
			case "this":
				if (isWorkerEntry) {
					runtimeRequirements.add(RuntimeGlobals.global);
					base = RuntimeGlobals.global;
				} else {
					runtimeRequirements.add(RuntimeGlobals.thisAsExports);
					base = "this";
				}
				break;
			default:
				throw new Error(`Unsupported base ${dep.base}`);
		}

		if (base === dep.base && equals(used, dep.names)) {
			// Nothing has to be changed
			// We don't use a replacement for compat reasons
			// for plugins that update `module._source` which they
			// shouldn't do!
			return;
		}

		source.replace(
			dep.range[0],
			dep.range[1] - 1,
			`${base}${propertyAccess(/** @type {string[]} */ (used))}`
		);
	}
};

module.exports = CommonJsSelfReferenceDependency;