const Encore = require('@symfony/webpack-encore');
const { resolve, parse } = require('path');
const { readdir } = require('fs').promises;

/**
 * get the file names inside given directory recursively, limiting to
 * a given depth in the recursion
 *
 * @param string  dir    the directory
 * @param int     depth  the maximum depth to look into
 */
async function* getFiles(dir, depth, ignored) {
    const dirents = await readdir(dir, { withFileTypes: true });
    for (const dirent of dirents) {
        const res = resolve(dir, dirent.name);
        if (dirent.isDirectory()) {
            if (depth > 0) {
              yield* getFiles(res, depth - 1, ignored);
            }
        } else if (ignored.includes(res)) {
            continue;
        } else {
            yield res;
        }
    }
};

/**
 * populate the config of encore in directories inside `'./src'` and
 * `'./vendor'` and letting them to alter the encore config.
 *
 * if a file `chill.webpack.config.js` is found, the default function is
 * imported and executed. This function receive two arguments:
 *
 * - `Encore`, the main encore object
 * - `chillEntries`: the entries which will be appended to the main `chill` module,
 * resulting in a chill.js and chill.css file.
 *
 */
async function populateConfig(Encore, chillEntries) {
    // chill-main contains some bootstrap that must be loaded first.
    // we register them first and, then, store this chill.webpack.config.js file
    // into `toIgnore`, ignoring it when we loop on other folders.
    let
        toIgnore = [];

    // loop into chill main
    for await (const f of getFiles('./vendor/chill-project/chill-bundles/src/Bundle/ChillMainBundle/', 1, [])) {
        let filename = parse(f).base;
        if (filename === 'chill.webpack.config.js') {
            configure = require(f);
            configure(Encore, chillEntries);
            toIgnore.push(f);
        }
    }

    // loop into other chill bundles
    for await (const f of getFiles('./vendor/chill-project/chill-bundles/src/Bundle', 2, toIgnore)) {
        let filename = parse(f).base;
        if (filename === 'chill.webpack.config.js') {
            configure = require(f);
            configure(Encore, chillEntries);
        }
    }

    // loop into other vendors
    for await (const f of getFiles('./vendor/', 3, toIgnore)) {
        let filename = parse(f).base;
        if (filename === 'chill.webpack.config.js') {
            configure = require(f);
            configure(Encore, chillEntries);
        }
    }

    // loop into src directory
    for await (const f of getFiles('./src', 3, [])) {
        let filename = parse(f).base;
        if (filename === 'chill.webpack.config.js') {
            configure = require(f);
            configure(Encore, chillEntries);
        }
    }
};

// export the final configuration
module.exports = (async () => {

   // Manually configure the runtime environment if not already configured yet by the "encore" command.
   // It's useful when you use tools that rely on webpack.config.js file.
   if (!Encore.isRuntimeEnvironmentConfigured()) {
      Encore.configureRuntimeEnvironment(process.env.NODE_ENV || 'dev');
   }
    // basic encore configuration
    Encore
        .setOutputPath('public/build/')
        .setPublicPath('/build')
        .enableSassLoader()
        .enableVueLoader(() => {}, {
            version: 3
        })
        .enableTypeScriptLoader(function (tsConfig){
           tsConfig.appendTsSuffixTo = [/\.vue$/];
           tsConfig.appendTsxSuffixTo = [/\.vue$/];
           // temporary fix for https://github.com/vuejs/vue-loader/issues/1915 and https://github.com/vuejs/core/issues/2855
           tsConfig.compilerOptions = {strict: !Encore.isProduction()};
           tsConfig.silent = false;
        })
        //.enableForkedTypeScriptTypesChecking()
        .autoProvidejQuery()
        .enableSourceMaps(!Encore.isProduction())
        .cleanupOutputBeforeBuild()
        .enableVersioning()
        .enableSingleRuntimeChunk()
        .splitEntryChunks()
        //.addLoader({ test: /\.pdf$/, loader: 'file-loader', options: { name: '[name]_[hash].[ext]', outputPath: 'pdf/' } })
    ;

    // populate config with chill entries
    let chillEntries = [];
    await populateConfig(Encore, chillEntries);

    // add swagger UI
    if (!Encore.isProduction()) {
        Encore
            .addEntry('swagger', __dirname + '/assets/swagger-ui/index.js')
            .addLoader({
                test: /\.yaml$/,
                type: 'json',
                use: [
                    { loader: 'json-loader' },
                    { loader: 'yaml-loader' }
                ],
            });
    }

    //getting the encore config and appending chill entries
    config = Encore.getWebpackConfig();
    config.entry.chill = chillEntries;

    if (!Encore.isProduction()) {
        console.log(config);
        config.devtool = 'eval-source-map';
    }

    return config;
})();