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// Portions Copyright [2018] [Payara Foundation and/or its affiliates]
package com.sun.enterprise.security.jacc.provider;

import java.security.Permission;
import java.security.PermissionCollection;
import java.security.Permissions;
import java.security.Principal;
import java.util.Enumeration;
import java.util.Set;

/**
 *
 * @author monzillo
 */
public class Role {

    private String roleName;
    private Permissions permissions;
    private Set principals;
    private boolean isAnyAuthenticatedUserRole;

    public Role(String name) {
        roleName = name;
    }

    /**
     * NB: Class Overrides equals and hashCode Methods such that 2 Roles are equal simply based on having a common name.
     * 
     * @param o
     * @return
     */
    @Override
    public boolean equals(Object o) {
        Role other = (o == null || !(o instanceof Role) ? null : (Role) o);
        return (o == null ? false : getName().equals(other.getName()));
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 29 * hash + (this.roleName != null ? this.roleName.hashCode() : 0);
        return hash;
    }

    public String getName() {
        return roleName;
    }

    void addPermission(Permission permission) {
        if (permissions == null) {
            permissions = new Permissions();
        }
        
        permissions.add(permission);
    }

    void addPermissions(PermissionCollection permissionCollection) {
        if (permissions == null) {
            permissions = new Permissions();
        }
        
        for (Enumeration e = permissionCollection.elements(); e.hasMoreElements();) {
            permissions.add(e.nextElement());
        }
    }

    Permissions getPermissions() {
        return permissions;
    }

    void setPrincipals(Set principalSet) {
        if (principalSet != null) {
            principals = principalSet;
        }
    }

    boolean implies(Permission permission) {
        boolean rvalue = false;
        if (permissions != null) {
            rvalue = permissions.implies(permission);
        }
        
        return rvalue;
    }

    void determineAnyAuthenticatedUserRole() {
        isAnyAuthenticatedUserRole = false;
        
        // If no princiapls are present then any authenticated user is possible
        if (principals == null || principals.isEmpty()) {
            isAnyAuthenticatedUserRole = true;
        }
    }

    boolean isAnyAuthenticatedUserRole() {
        return isAnyAuthenticatedUserRole;
    }

    boolean isPrincipalInRole(Principal principal) {
        if (isAnyAuthenticatedUserRole && principal != null) {
            return true;
        }

        boolean rvalue = false;
        if (principals != null) {
            rvalue = principals.contains(principal);
        }
        
        return rvalue;
    }

    boolean arePrincipalsInRole(Principal subject[]) {
        if (subject == null || subject.length == 0) {
            return false;
        }
        
        if (isAnyAuthenticatedUserRole) {
            return true;
        }
        
        if (principals == null || principals.isEmpty()) {
            return false;
        }

        boolean rvalue = false;
        for (Principal principal : subject) {
            if (principals.contains(principal)) {
                rvalue = true;
                break;
            }
        }
        
        return rvalue;
    }
}