import 'package:swagger_generator_flutter/validators/core/validation_context.dart';
import 'package:swagger_generator_flutter/validators/core/validation_result.dart';
import 'package:swagger_generator_flutter/validators/core/validation_rule.dart';

/// 服务器配置验证规则
class ServerValidationRule extends ValidationRule {
  @override
  String get id => 'server_validation';

  @override
  String get name => '服务器配置验证';

  @override
  ValidationResult validate(ValidationContext context) {
    final servers = context.document.servers;
    final errors = <ValidationError>[];
    final warnings = <ValidationWarning>[];

    if (servers.isEmpty) {
      warnings.add(
        const ValidationWarning(
          path: 'servers',
          message: '未定义服务器配置',
          suggestion: '建议添加至少一个服务器配置',
        ),
      );
      return ValidationResult(isValid: true, warnings: warnings);
    }

    for (var i = 0; i < servers.length; i++) {
      final server = servers[i];
      final path = 'servers[$i]';

      if (server.url.isEmpty) {
        errors.add(
          ValidationError(
            path: '$path.url',
            message: '服务器 URL 不能为空',
            type: ValidationErrorType.required,
          ),
        );
      } else if (!_isValidUrl(server.url)) {
        errors.add(
          ValidationError(
            path: '$path.url',
            message: '服务器 URL 格式无效: ${server.url}',
            type: ValidationErrorType.format,
            suggestion: '请使用有效的 URL 格式，如 "https://api.example.com"',
          ),
        );
      }

      // 验证服务器变量
      server.variables.forEach((name, variable) {
        if (variable.defaultValue.isEmpty) {
          errors.add(
            ValidationError(
              path: '$path.variables.$name.default',
              message: '服务器变量必须有默认值',
              type: ValidationErrorType.required,
            ),
          );
        }
      });
    }

    return ValidationResult(
      isValid: errors.isEmpty,
      errors: errors,
      warnings: warnings,
    );
  }

  bool _isValidUrl(String url) {
    try {
      final uri = Uri.parse(url);
      return uri.hasScheme && (uri.scheme == 'http' || uri.scheme == 'https');
    } on Object {
      return false;
    }
  }
}