import { IsString, IsOptional, IsArray, ValidateNested, IsIn } from 'class-validator';
import { Type } from 'class-transformer';

export class ChatMessageDto {
  @IsIn(['user', 'assistant', 'system'])
  role!: 'user' | 'assistant' | 'system';

  @IsString()
  content!: string;
}

export class AskDto {
  @IsArray()
  @ValidateNested({ each: true })
  @Type(() => ChatMessageDto)
  messages!: ChatMessageDto[];

  @IsOptional()
  @IsString()
  context?: string;     // JSON string of CEO OS context snapshot
}