import 'dart:io';

import 'package:dotenv/dotenv.dart';

class ServerEnv {
  ServerEnv._({
    required this.databaseUrl,
    required this.port,
    required this.firebaseWebApiKey,
    required this.questionWorkerEnabled,
    required this.questionWorkerIntervalSeconds,
    required this.questionPipelineTestMode,
  });

  final String databaseUrl;
  final int port;
  final String firebaseWebApiKey;
  final bool questionWorkerEnabled;
  final int questionWorkerIntervalSeconds;
  final bool questionPipelineTestMode;

  static ServerEnv load() {
    final DotEnv env = DotEnv(includePlatformEnvironment: true)
      ..load(['.env']);

    final String? databaseUrl = env['DATABASE_URL'];
    if (databaseUrl == null || databaseUrl.isEmpty) {
      stderr.writeln('DATABASE_URL is required in server/.env');
      exit(1);
    }

    final String? apiKey = env['FIREBASE_WEB_API_KEY'];
    if (apiKey == null || apiKey.isEmpty) {
      stderr.writeln('FIREBASE_WEB_API_KEY is required in server/.env');
      exit(1);
    }

    final int port = int.tryParse(env['PORT'] ?? '3000') ?? 3000;
    final bool workerEnabled =
        (env['QUESTION_WORKER_ENABLED'] ?? 'true').toLowerCase() != 'false';
    final int workerIntervalSeconds =
        int.tryParse(env['QUESTION_WORKER_INTERVAL_SECONDS'] ?? '60') ?? 60;
    final bool pipelineTestMode =
        (env['QUESTION_PIPELINE_TEST_MODE'] ?? 'false').toLowerCase() == 'true';

    return ServerEnv._(
      databaseUrl: databaseUrl,
      port: port,
      firebaseWebApiKey: apiKey,
      questionWorkerEnabled: workerEnabled,
      questionWorkerIntervalSeconds: workerIntervalSeconds,
      questionPipelineTestMode: pipelineTestMode,
    );
  }
}