import { DefinePlugin } from 'webpack';
import * as nodeExternals from 'webpack-node-externals';
import * as copyPlugin from 'copy-webpack-plugin';
import { resolve } from 'path';
import * as pkg from './package.json';

function transform_package(input: Buffer): string {
	const pkg = JSON.parse(input.toString());
	pkg['scripts'] = {
		start: 'node server.js'
	};
	pkg['dependencies'] = Object.fromEntries(
		Object.entries<string>(pkg['dependencies']).filter((dep) =>
			pkg['runtimeDependencies'].includes(dep[0])
		)
	);
	delete pkg['runtimeDependencies'];
	delete pkg['devDependencies'];
	delete pkg['jest'];
	return JSON.stringify(pkg, null, '\t');
}

export default {
	entry: './src/main.ts',
	plugins: [
		new DefinePlugin({
			PROD: JSON.stringify(true)
		}),
		new copyPlugin({
			patterns: [
				{
					from: resolve(__dirname, 'package.json'),
					to: resolve(__dirname, 'dist', 'package.json'),
					transform: transform_package
				}
			]
		})
	],
	module: {
		rules: [
			{
				test: /\.ts?$/,
				use: 'ts-loader'
			}
		]
	},
	externalsPresets: { node: true },
	mode: 'production',
	resolve: {
		extensions: ['.ts', '.js']
	},
	output: {
		filename: 'server.js',
		path: resolve(__dirname, 'dist')
	},
	externals: [
		nodeExternals({
			allowlist: (dep) => !pkg.runtimeDependencies.includes(dep)
		})
	],
	performance: {
		maxEntrypointSize: 512 * 1024 * 1024,
		maxAssetSize: 512 * 1024 * 1024
	}
};