import 'dart:io';

import 'package:args/args.dart';

ArgParser buildParser() {
  return ArgParser()
    ..addOption(
      'isar',
    )
    ..addOption(
      'backend-url',
      help: 'Override backend API base URL (e.g. https://api.example.com)',
    )
    ..addFlag('debug');
}

class BotConfig {
  BotConfig({
    required this.backendUrl,
    required this.shareDailyLimit,
  });

  final String backendUrl;
  final int shareDailyLimit;

  static const String defaultBackendUrl = 'https://api.mnemo-cards.online';
  static const int defaultShareDailyLimit = 1;

  factory BotConfig.fromArgs(
    ArgResults results, {
    Map<String, String>? environment,
  }) {
    final env = environment ?? Platform.environment;
    final argValue = results.wasParsed('backend-url')
        ? results['backend-url'] as String?
        : null;

    final resolved = <String?>[
      argValue,
      env['MNEMO_BACKEND_URL'],
      env['BACKEND_URL'],
      defaultBackendUrl,
    ].firstWhere(
      (value) => value != null && value.trim().isNotEmpty,
    )!;

    final shareDailyLimitStr = env['BOT_SHARE_DAILY_LIMIT'];
    final shareDailyLimit = shareDailyLimitStr != null
        ? int.tryParse(shareDailyLimitStr) ?? defaultShareDailyLimit
        : defaultShareDailyLimit;

    return BotConfig(
      backendUrl: resolved.trim(),
      shareDailyLimit: shareDailyLimit,
    );
  }
}