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import path from 'node:path';
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import webpack from 'webpack';
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import getPublicLibConfig from '../../webpack.config.js';
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export default function getWebpackServeMiddleware() {
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    /**
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     * A very spartan recreation of webpack-dev-middleware.
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     * @param {import('express').Request} req Request object.
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     * @param {import('express').Response} res Response object.
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     * @param {import('express').NextFunction} next Next function.
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     * @type {import('express').RequestHandler}
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     */
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    function devMiddleware(req, res, next) {
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        const publicLibConfig = getPublicLibConfig();
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        const outputPath = publicLibConfig.output?.path;
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        const outputFile = publicLibConfig.output?.filename;
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        const parsedPath = path.parse(req.path);
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        if (req.method === 'GET' && parsedPath.dir === '/' && parsedPath.base === outputFile) {
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            return res.sendFile(outputFile, { root: outputPath });
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        }
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        next();
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    }
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    /**
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     * Wait until Webpack is done compiling.
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     * @param {object} param Parameters.
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     * @param {boolean} [param.forceDist=false] Whether to force the use the /dist folder.
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     * @param {boolean} [param.pruneCache=false] Whether to prune old cache directories before compiling.
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     * @returns {Promise<void>}
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     */
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    devMiddleware.runWebpackCompiler = ({ forceDist = false, pruneCache = false } = {}) => {
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        console.log();
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        console.log('Compiling frontend libraries...');
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        const publicLibConfig = getPublicLibConfig({ forceDist, pruneCache });
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        const compiler = webpack(publicLibConfig);
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        return new Promise((resolve) => {
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            compiler.run((_error, stats) => {
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                const output = stats?.toString(publicLibConfig.stats);
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                if (output) {
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                    console.log(output);
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                    console.log();
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                }
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                compiler.close(() => {
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                    resolve();
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                });
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            });
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        });
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    };
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    return devMiddleware;
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}