import { IValueObject } from '@core/shared/domain';
import { AdminDomainValidationError } from '../errors/AdminDomainError';

export type UserRoleValue = string;

export interface UserRoleProps {
  value: UserRoleValue;
}

export class UserRole implements IValueObject<UserRoleProps> {
  readonly value: UserRoleValue;

  private constructor(value: UserRoleValue) {
    this.value = value;
  }

  static create(value: UserRoleValue): UserRole {
    // Handle null/undefined
    if (value === null || value === undefined) {
      throw new AdminDomainValidationError('Role cannot be empty');
    }

    const trimmed = value.trim();
    
    if (!trimmed) {
      throw new AdminDomainValidationError('Role cannot be empty');
    }

    return new UserRole(trimmed);
  }

  static fromString(value: string): UserRole {
    return this.create(value);
  }

  get props(): UserRoleProps {
    return { value: this.value };
  }

  toString(): UserRoleValue {
    return this.value;
  }

  equals(other: IValueObject<UserRoleProps>): boolean {
    return this.value === other.props.value;
  }

  /**
   * Check if this role is a system administrator role
   */
  isSystemAdmin(): boolean {
    const lower = this.value.toLowerCase();
    return lower === 'owner' || lower === 'admin';
  }

  /**
   * Check if this role has higher authority than another role
   */
  hasHigherAuthorityThan(other: UserRole): boolean {
    const hierarchy: Record<string, number> = {
      user: 0,
      admin: 1,
      owner: 2,
    };
    
    const myValue = this.value.toLowerCase();
    const otherValue = other.value.toLowerCase();
    
    const myRank = hierarchy[myValue] ?? 0;
    const otherRank = hierarchy[otherValue] ?? 0;
    
    return myRank > otherRank;
  }
}