import { ConflictException } from "@nestjs/common";

/**
 * Exception thrown when a concurrent update conflict is detected
 * This occurs when optimistic locking detects that a record has been
 * modified by another process between read and write operations
 */
export class ConcurrentUpdateException extends ConflictException {
  constructor(resourceType: string, resourceId: string, currentVersion?: number) {
    const message = currentVersion
      ? `Concurrent update detected for ${resourceType} ${resourceId} at version ${String(currentVersion)}. The record was modified by another process.`
      : `Concurrent update detected for ${resourceType} ${resourceId}. The record was modified by another process.`;

    super({
      message,
      error: "Concurrent Update Conflict",
      resourceType,
      resourceId,
      currentVersion,
      retryable: true,
    });
  }
}