import 'dart:io';

import 'alpaca/alpaca_env.dart';
import 'market_history_env.dart';
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,
    required this.tradingEnabled,
    required this.tradingWorkerIngestEnabled,
    required this.tradingWorkerEvalEnabled,
    required this.tradingDevEndpointsEnabled,
    required this.adminPortalEnabled,
    required this.adminFirebaseUids,
    required this.marketHistory,
    required this.alpaca,
  });

  final String databaseUrl;
  final int port;
  final String firebaseWebApiKey;
  final bool questionWorkerEnabled;
  final int questionWorkerIntervalSeconds;
  final bool questionPipelineTestMode;
  final bool tradingEnabled;
  final bool tradingWorkerIngestEnabled;
  final bool tradingWorkerEvalEnabled;

  /// Mounts dev-only endpoints under `/v1/me/trading/dev/*` (e.g. `force-fire`).
  /// Default false — never enable in production.
  final bool tradingDevEndpointsEnabled;
  final bool adminPortalEnabled;
  final Set<String> adminFirebaseUids;

  /// Rolling market-history sync, retention, and guess-rule settings.
  final MarketHistoryEnv marketHistory;

  /// Shorthand for [MarketHistoryEnv.syncEnabled].
  bool get marketHistorySyncEnabled => marketHistory.syncEnabled;

  final AlpacaEnv alpaca;

  /// Validates cross-flag constraints after [load].
  void assertConsistent() {
    marketHistory.assertConsistent(tradingEnabled: tradingEnabled);
  }

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

    // Build a sanitized snapshot of the Alpaca-relevant keys for AlpacaEnv.
    const List<String> alpacaKeys = <String>[
      'ALPACA_API_KEY_ID',
      'ALPACA_API_SECRET_KEY',
      'ALPACA_TRADING_BASE_URL',
      'ALPACA_DATA_BASE_URL',
      'ALPACA_DATA_FEED',
      'ALPACA_ALLOW_LIVE',
    ];
    final Map<String, String> envMap = <String, String>{
      for (final String key in alpacaKeys)
        if (env[key] != null && env[key]!.isNotEmpty) key: env[key]!,
    };

    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';
    final bool tradingEnabled =
        (env['TRADING_ENABLED'] ?? 'false').toLowerCase() == 'true';
    final bool tradingWorkerIngestEnabled =
        (env['TRADING_WORKER_INGEST_ENABLED'] ?? 'true').toLowerCase() !=
            'false';
    final bool tradingWorkerEvalEnabled =
        (env['TRADING_WORKER_EVAL_ENABLED'] ?? 'true').toLowerCase() != 'false';
    final bool tradingDevEndpointsEnabled =
        (env['TRADING_DEV_ENDPOINTS_ENABLED'] ?? 'false').toLowerCase() ==
            'true';
    final bool adminPortalEnabled =
        (env['ADMIN_PORTAL_ENABLED'] ?? 'false').toLowerCase() == 'true';
    final Set<String> adminFirebaseUids = (env['ADMIN_FIREBASE_UIDS'] ?? '')
        .split(',')
        .map((String value) => value.trim())
        .where((String value) => value.isNotEmpty)
        .toSet();
    final Map<String, String> stringEnv =
        Map<String, String>.from(Platform.environment);
    const List<String> marketHistoryKeys = <String>[
      'MARKET_HISTORY_SYNC_ENABLED',
      'MARKET_HISTORY_WINDOW_DAYS',
      'MARKET_HISTORY_RETENTION_DAYS',
      'MARKET_HISTORY_ARCHIVE_ENABLED',
      'MARKET_UNIVERSE_REFRESH_HOURS',
      'MARKET_HISTORY_SYNC_HOURS',
      'MARKET_HISTORY_CLEANUP_HOURS',
      'MARKET_HISTORY_SYNC_HOUR_UTC',
      'HISTORY_SYNC_BATCH_SIZE',
      'HISTORY_SYNC_MAX_SYMBOLS',
      'MIN_BARS_FOR_GUESS',
      'GUESS_COOLDOWN_HOURS',
    ];
    for (final String key in marketHistoryKeys) {
      final String? value = env[key];
      if (value != null && value.isNotEmpty) {
        stringEnv[key] = value;
      }
    }
    final MarketHistoryEnv marketHistory =
        MarketHistoryEnv.fromMap(stringEnv);

    final AlpacaEnv alpaca = AlpacaEnv.fromMap(envMap)..assertPaperOnly();

    final ServerEnv loaded = ServerEnv._(
      databaseUrl: databaseUrl,
      port: port,
      firebaseWebApiKey: apiKey,
      questionWorkerEnabled: workerEnabled,
      questionWorkerIntervalSeconds: workerIntervalSeconds,
      questionPipelineTestMode: pipelineTestMode,
      tradingEnabled: tradingEnabled,
      tradingWorkerIngestEnabled: tradingWorkerIngestEnabled,
      tradingWorkerEvalEnabled: tradingWorkerEvalEnabled,
      tradingDevEndpointsEnabled: tradingDevEndpointsEnabled,
      adminPortalEnabled: adminPortalEnabled,
      adminFirebaseUids: adminFirebaseUids,
      marketHistory: marketHistory,
      alpaca: alpaca,
    );
    loaded.assertConsistent();
    return loaded;
  }
}