const { withDangerousMod } = require("@expo/config-plugins");
const fs = require("fs");
const path = require("path");
const os = require("os");

/**
 * Generates android/local.properties with sdk.dir during prebuild.
 * Tries ANDROID_HOME env var first, then common locations.
 */
const withAndroidLocalProperties = (config) => {
  return withDangerousMod(config, [
    "android",
    async (config) => {
      const androidDir = path.join(config.modRequest.projectRoot, "android");
      const localPropertiesPath = path.join(androidDir, "local.properties");

      const sdkDir =
        process.env.ANDROID_HOME ||
        process.env.ANDROID_SDK_ROOT ||
        path.join(os.homedir(), "android-sdk");

      if (fs.existsSync(sdkDir)) {
        fs.writeFileSync(localPropertiesPath, `sdk.dir=${sdkDir}\n`);
        console.log(`[withAndroidLocalProperties] sdk.dir=${sdkDir}`);
      } else {
        console.warn(
          `[withAndroidLocalProperties] Android SDK not found at ${sdkDir}. Set ANDROID_HOME.`
        );
      }

      return config;
    },
  ]);
};

module.exports = withAndroidLocalProperties;