import { TaskStatus, TaskPriority } from "@prisma/client";
import {
  IsString,
  IsOptional,
  IsUUID,
  IsEnum,
  IsDateString,
  IsInt,
  IsObject,
  MinLength,
  MaxLength,
  Min,
} from "class-validator";

/**
 * DTO for updating an existing task
 * All fields are optional to support partial updates
 */
export class UpdateTaskDto {
  @IsOptional()
  @IsString({ message: "title must be a string" })
  @MinLength(1, { message: "title must not be empty" })
  @MaxLength(255, { message: "title must not exceed 255 characters" })
  title?: string;

  @IsOptional()
  @IsString({ message: "description must be a string" })
  @MaxLength(10000, { message: "description must not exceed 10000 characters" })
  description?: string | null;

  @IsOptional()
  @IsEnum(TaskStatus, { message: "status must be a valid TaskStatus" })
  status?: TaskStatus;

  @IsOptional()
  @IsEnum(TaskPriority, { message: "priority must be a valid TaskPriority" })
  priority?: TaskPriority;

  @IsOptional()
  @IsDateString({}, { message: "dueDate must be a valid ISO 8601 date string" })
  dueDate?: Date | null;

  @IsOptional()
  @IsUUID("4", { message: "assigneeId must be a valid UUID" })
  assigneeId?: string | null;

  @IsOptional()
  @IsUUID("4", { message: "projectId must be a valid UUID" })
  projectId?: string | null;

  @IsOptional()
  @IsUUID("4", { message: "parentId must be a valid UUID" })
  parentId?: string | null;

  @IsOptional()
  @IsString({ message: "assignedAgent must be a string" })
  @MinLength(1, { message: "assignedAgent must not be empty" })
  @MaxLength(255, { message: "assignedAgent must not exceed 255 characters" })
  assignedAgent?: string | null;

  @IsOptional()
  @IsInt({ message: "sortOrder must be an integer" })
  @Min(0, { message: "sortOrder must be at least 0" })
  sortOrder?: number;

  @IsOptional()
  @IsObject({ message: "metadata must be an object" })
  metadata?: Record<string, unknown>;
}