const { build } = require("esbuild");
const fs = require("fs");
const path = require("path");

function loadEnvFile(filePath) {
  if (!fs.existsSync(filePath)) return {};
  return fs.readFileSync(filePath, "utf8").split(/\r?\n/).reduce((acc, line) => {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith("#")) return acc;
    const index = trimmed.indexOf("=");
    if (index <= 0) return acc;
    const key = trimmed.slice(0, index).trim();
    const value = trimmed.slice(index + 1).trim();
    if (key) acc[key] = value;
    return acc;
  }, {});
}

function buildEmbeddedEnvBanner() {
  const env = loadEnvFile(path.resolve(__dirname, ".env.production"));
  const lines = Object.entries(env).map(([key, value]) => `process.env[${JSON.stringify(key)}]=${JSON.stringify(value)};`);
  if (!lines.length) return "";
  return `/* embedded .env.production */\n${lines.join("\n")}`;
}

build({
  entryPoints: ["./index.js"],
  outfile: "./dist/bundle.js",
  platform: "node",
  bundle: true,
  minify: true,
  sourcemap: false,
  target: ["node16", "node18", "node20"],
  banner: {
    js: buildEmbeddedEnvBanner(),
  },
  external: ["mysql2", "pg"],
  plugins: [
    {
      name: "bundle-oracledb-js",
      setup(build) {
        build.onResolve({ filter: /^oracledb$/ }, () => ({
          path: path.resolve(__dirname, "node_modules", "oracledb", "index.js"),
        }));
      },
    },
  ],
}).catch(() => process.exit(1));