import { banner } from './build-common.js';

/** @type {string} */
const mode = process.env.MODE || 'development';

/** @type {boolean} */
const isDevelopment = mode === 'development';

/** @type {string} */
const modeString = JSON.stringify(mode);

/** @type {Record<string, string>} */
const defineEnv = {
  'import.meta.env.DEV': JSON.stringify(isDevelopment),
  'import.meta.env.MODE': modeString,
  'import.meta.env.PROD': JSON.stringify(!isDevelopment),
  'process.env.NODE_ENV': modeString,
  'process.env.MODE': modeString,
};

/**
 * @param {import('esbuild').BuildOptions} config
 * @param {Record<string, string>} [metaEnvVars]
 * @returns {import('esbuild').BuildOptions}
 */
export function getConfig(config, metaEnvVars) {
  /** @type {Record<string, string>} */
  const defineMeta = {};
  if (metaEnvVars) {
    for (const varName in metaEnvVars) {
      defineMeta[`import.meta.env.${varName}`] = JSON.stringify(metaEnvVars[varName]);
    }
  }
  return {
    logLevel: 'info',
    bundle: true,
    treeShaking: !isDevelopment,
    minify: !isDevelopment,
    banner: {
      js: banner,
    },
    ...config,
    sourcemap: isDevelopment ? (config.sourcemap || true) : false,
    define: {
      ...defineEnv,
      ...defineMeta,
      ...config.define,
    },
    plugins: [
      ...(config.plugins || []),
    ],
  };
}