export const ROLES = {
  CITIZEN: 'CITIZEN',
  OPERATOR: 'OPERATOR',
  ADMIN: 'ADMIN'
} as const

export type Role = keyof typeof ROLES

export const ROLE_LEVELS: Record<string, number> = {
  [ROLES.CITIZEN]: 1,
  [ROLES.OPERATOR]: 2,
  [ROLES.ADMIN]: 3
}

export function normalizeRole(role?: string | null): string {
  return role?.trim().toUpperCase() ?? ''
}

export function isRole(userRole: string | undefined | null, targetRole: string): boolean {
  return normalizeRole(userRole) === targetRole.toUpperCase()
}

export function hasMinimumRole(userRole: string | undefined | null, requiredRole: string): boolean {
  const userLvl = ROLE_LEVELS[normalizeRole(userRole)] || 0
  const reqLvl = ROLE_LEVELS[requiredRole.toUpperCase()] || 0
  return userLvl >= reqLvl
}

export function isAdmin(userRole?: string | null): boolean {
  return isRole(userRole, ROLES.ADMIN)
}

export function isOperator(userRole?: string | null): boolean {
  return isRole(userRole, ROLES.OPERATOR)
}

export function isCitizen(userRole?: string | null): boolean {
  return isRole(userRole, ROLES.CITIZEN)
}

export function canAccess(userRole: string | undefined | null, requiredRole: string): boolean {
  return hasMinimumRole(userRole, requiredRole)
}