const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/',
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.jsx'],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './public/index.html',
    })
  ],
  devServer: {
    static: {
      directory: path.join(__dirname, 'dist'),
    },
    compress: true,
    port: 3000,
    host: '127.0.0.1', // Listen only on localhost, external access via Nginx proxy
    hot: true,
    historyApiFallback: true,
    allowedHosts: 'all', // Allow all hosts to prevent "invalid host header" error
    client: {
      webSocketURL: 'auto://0.0.0.0:0/ws'
    },
    proxy: {
      '/api': 'http://127.0.0.1:3001', // Proxy API calls to Express server
    },
  },
};