/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.keycloak.dom.saml.v2.assertion;

import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.xml.datatype.XMLGregorianCalendar;

import org.keycloak.dom.saml.common.CommonAssertionType;

import org.w3c.dom.Element;

/**
 * <complexType name="AssertionType"> <sequence> <element ref="saml:Issuer"/> <element ref="ds:Signature"
 * minOccurs="0"/>
 * <element ref="saml:Subject" minOccurs="0"/> <element ref="saml:Conditions" minOccurs="0"/> <element
 * ref="saml:Advice"
 * minOccurs="0"/> <choice minOccurs="0" maxOccurs="unbounded"> <element ref="saml:Statement"/> <element
 * ref="saml:AuthnStatement"/> <element ref="saml:AuthzDecisionStatement"/> <element ref="saml:AttributeStatement"/>
 * </choice>
 * </sequence> <attribute name="Version" type="string" use="required"/> <attribute name="ID" type="ID" use="required"/>
 * <attribute name="IssueInstant" type="dateTime" use="required"/> </complexType>
 *
 * @author Anil.Saldhana@redhat.com
 * @since Nov 24, 2010
 */
public class AssertionType extends CommonAssertionType {

    private Element signature;

    private final String version = "2.0";

    private AdviceType advice;

    private NameIDType issuer;

    private SubjectType subject;

    private ConditionsType conditions;

    private final Set<StatementAbstractType> statements = new LinkedHashSet<StatementAbstractType>();

    /**
     * Create an assertion
     *
     * @param iD ID of the assertion (Required)
     * @param issueInstant {@link XMLGregorianCalendar} issue instant (required)
     * @param version
     */
    public AssertionType(String iD, XMLGregorianCalendar issueInstant) {
        super(iD, issueInstant);
    }

    /**
     * Get the subject
     *
     * @return {@link SubjectType}
     */
    public SubjectType getSubject() {
        checkSTSPermission();
        return subject;
    }

    /**
     * Set the subject
     *
     * @param subject
     */
    public void setSubject(SubjectType subject) {
        checkSTSPermission();
        this.subject = subject;
    }

    /**
     * Get the version of SAML
     *
     * @return {@link String}
     */
    public String getVersion() {
        return version;
    }

    /**
     * Get the advice
     *
     * @return {@link AdviceType}
     */
    public AdviceType getAdvice() {
        return advice;
    }

    /**
     * Set the advice
     *
     * @param advice {@link advice}
     */
    public void setAdvice(AdviceType advice) {
        checkSTSPermission();

        this.advice = advice;
    }

    /**
     * Get the conditions
     *
     * @return {@link ConditionsType}
     */
    public ConditionsType getConditions() {
        checkSTSPermission();

        return conditions;
    }

    /**
     * Set the conditions
     *
     * @param conditions {@link ConditionsType}
     */
    public void setConditions(ConditionsType conditions) {
        checkSTSPermission();

        this.conditions = conditions;
    }

    /**
     * Get the issuer
     *
     * @return {@link NameIDType}
     */
    public NameIDType getIssuer() {
        return issuer;
    }

    /**
     * Set the issuer
     *
     * @param issuer {@link NameIDType}
     */
    public void setIssuer(NameIDType issuer) {
        checkSTSPermission();

        this.issuer = issuer;
    }

    /**
     * Add a statement
     *
     * @param statement {@link StatementAbstractType}
     */
    public void addStatement(StatementAbstractType statement) {
        checkSTSPermission();

        this.statements.add(statement);
    }

    /**
     * Add a collection of statements
     *
     * @param statement {@link Collection}
     */
    public void addStatements(Collection<StatementAbstractType> statement) {
        checkSTSPermission();

        this.statements.addAll(statement);
    }

    /**
     * Add a set of statements
     *
     * @param statement {@link Collection}
     */
    public void addStatements(Set<StatementAbstractType> statement) {
        checkSTSPermission();

        this.statements.addAll(statement);
    }

    /**
     * Get a read only set of statements
     *
     * @return {@link Set}
     */
    public Set<StatementAbstractType> getStatements() {
        checkSTSPermission();

        return Collections.unmodifiableSet(statements);
    }

    /**
     * Get the signature as a DOM element
     *
     * @return {@link Element}
     */
    public Element getSignature() {
        return signature;
    }

    /**
     * Set the signature DOM element
     *
     * @param signature
     */
    public void setSignature(Element signature) {
        this.signature = signature;
    }

    public Set<AttributeStatementType> getAttributeStatements() {
        Set<AttributeStatementType> attributeStatements = new HashSet<>();
        Set<StatementAbstractType> statements = getStatements();

        if (statements != null) {
            for (StatementAbstractType statement : statements) {
                if (AttributeStatementType.class.isInstance(statement)) {
                    attributeStatements.add((AttributeStatementType) statement);
                }
            }
        }

        return attributeStatements;
    }

    /**
     * Update the issue instant
     *
     * @param xg
     */
    public void updateIssueInstant(XMLGregorianCalendar xg) {
        checkSTSPermission();

        this.issueInstant = xg;
    }

    protected void checkSTSPermission() {
        SecurityManager sm = System.getSecurityManager();
        if (sm != null)
            sm.checkPermission(new RuntimePermission("org.picketlink.sts"));
    }
}