"use strict";

const fs = require("fs");
const path = require("path");

/** @typedef {import("webpack").Compiler} Compiler */
/** @typedef {import("webpack").MultiCompiler} MultiCompiler */
/** @typedef {import("webpack").Compilation} Compilation */
/** @typedef {import("../index.js").IncomingMessage} IncomingMessage */
/** @typedef {import("../index.js").ServerResponse} ServerResponse */

/**
 * @template {IncomingMessage} Request
 * @template {ServerResponse} Response
 * @param {import("../index.js").WithOptional<import("../index.js").Context<Request, Response>, "watching" | "outputFileSystem">} context
 */
function setupWriteToDisk(context) {
  /**
   * @type {Compiler[]}
   */
  const compilers = /** @type {MultiCompiler} */
  context.compiler.compilers || [context.compiler];
  for (const compiler of compilers) {
    compiler.hooks.emit.tap("DevMiddleware", () => {
      // @ts-ignore
      if (compiler.hasWebpackDevMiddlewareAssetEmittedCallback) {
        return;
      }
      compiler.hooks.assetEmitted.tapAsync("DevMiddleware", (file, info, callback) => {
        const {
          targetPath,
          content
        } = info;
        const {
          writeToDisk: filter
        } = context.options;
        const allowWrite = filter && typeof filter === "function" ? filter(targetPath) : true;
        if (!allowWrite) {
          return callback();
        }
        const dir = path.dirname(targetPath);
        const name = compiler.options.name ? `Child "${compiler.options.name}": ` : "";
        return fs.mkdir(dir, {
          recursive: true
        }, mkdirError => {
          if (mkdirError) {
            context.logger.error(`${name}Unable to write "${dir}" directory to disk:\n${mkdirError}`);
            return callback(mkdirError);
          }
          return fs.writeFile(targetPath, content, writeFileError => {
            if (writeFileError) {
              context.logger.error(`${name}Unable to write "${targetPath}" asset to disk:\n${writeFileError}`);
              return callback(writeFileError);
            }
            context.logger.log(`${name}Asset written to disk: "${targetPath}"`);
            return callback();
          });
        });
      });

      // @ts-ignore
      compiler.hasWebpackDevMiddlewareAssetEmittedCallback = true;
    });
  }
}
module.exports = setupWriteToDisk;