import { DateFormatter } from "@/lib/formatters/DateFormatter";
import { UserRoleFormatter } from "@/lib/formatters/UserRoleFormatter";
import { UserStatusFormatter } from "@/lib/formatters/UserStatusFormatter";
import type { AdminUserViewData } from '@/lib/view-data/AdminUserViewData';
import { ViewModel } from "../contracts/view-models/ViewModel";

/**
 * AdminUserViewModel
 *
 * View Model for admin user management.
 * Transforms API DTO into UI-ready state with formatting and derived fields.
 */
export class AdminUserViewModel extends ViewModel {
  private readonly data: AdminUserViewData;

  constructor(data: AdminUserViewData) {
    super();
    this.data = data;
  }

  get id(): string { return this.data.id; }
  get email(): string { return this.data.email; }
  get displayName(): string { return this.data.displayName; }
  get roles(): string[] { return this.data.roles; }
  get status(): string { return this.data.status; }
  get isSystemAdmin(): boolean { return this.data.isSystemAdmin; }
  get createdAt(): string { return this.data.createdAt; }
  get updatedAt(): string { return this.data.updatedAt; }
  get lastLoginAt(): string | undefined { return this.data.lastLoginAt; }
  get primaryDriverId(): string | undefined { return this.data.primaryDriverId; }

  /** UI-specific: Role badges using Display Object */
  get roleBadges(): string[] {
    return this.roles.map(role => UserRoleFormatter.roleLabel(role));
  }

  /** UI-specific: Status badge label using Display Object */
  get statusBadgeLabel(): string {
    return UserStatusFormatter.statusLabel(this.status);
  }

  /** UI-specific: Status badge variant using Display Object */
  get statusBadgeVariant(): string {
    return UserStatusFormatter.statusVariant(this.status);
  }

  /** UI-specific: Formatted last login date */
  get lastLoginFormatted(): string {
    return this.lastLoginAt
      ? DateFormatter.formatShort(this.lastLoginAt)
      : 'Never';
  }

  /** UI-specific: Formatted creation date */
  get createdAtFormatted(): string {
    return DateFormatter.formatShort(this.createdAt);
  }
}