import { Request, Response, NextFunction } from 'express'
import { EmployeeRole } from '@rentaldrivego/database'
import { sendUnauthorized, sendForbidden } from './authHelpers'

const ROLE_RANK: Record<EmployeeRole, number> = {
  OWNER:   3,
  MANAGER: 2,
  AGENT:   1,
}

/**
 * Requires the authenticated employee to have at least `minimumRole`.
 * Must be applied after `requireCompanyAuth`.
 */
export function requireRole(minimumRole: EmployeeRole) {
  return (req: Request, res: Response, next: NextFunction) => {
    const employee = req.employee
    if (!employee) return sendUnauthorized(res, 'unauthenticated', 'Authentication required')

    const employeeRank = ROLE_RANK[employee.role] ?? 0
    const requiredRank = ROLE_RANK[minimumRole]   ?? 99

    if (employeeRank < requiredRank) {
      return sendForbidden(res, 'forbidden', `This action requires the ${minimumRole} role or higher`, {
        requiredRole: minimumRole,
        yourRole: employee.role,
      })
    }

    next()
  }
}