import { ApiProperty, ApiPropertyOptional } from "@nestjs/swagger";
import { IsEnum, IsNotEmpty, IsOptional, IsString, MaxLength } from "class-validator";
import { Exclude, Expose } from "class-transformer";

export enum CancellationReason {
  EMPLOYEE_LEFT = "employee_left",
  ROLE_CHANGED = "role_changed",
  PERFORMANCE = "performance",
  ADMIN_ERROR = "admin_error",
  OTHER = "other",
}

/**
 * DTO for cancelling a participant license allocation
 */
@Exclude()
export class CancelLicenseDto {
  @Expose()
  @ApiProperty({
    description: "Reason for cancellation",
    enum: CancellationReason,
    example: CancellationReason.EMPLOYEE_LEFT,
  })
  @IsNotEmpty()
  @IsEnum(CancellationReason)
  reason!: CancellationReason;

  @Expose()
  @ApiPropertyOptional({
    description: "Additional notes about the cancellation",
    example: "Employee left the company on 2025-01-15",
    maxLength: 500,
  })
  @IsOptional()
  @IsString()
  @MaxLength(500)
  notes?: string;
}