/*
 * oauth2-oidc-sdk
 *
 * Copyright 2012-2016, Connect2id Ltd and contributors.
 *
 * 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 com.nimbusds.openid.connect.sdk.assurance.evidences;


import java.util.List;
import java.util.Objects;

import net.minidev.json.JSONObject;

import com.nimbusds.oauth2.sdk.ParseException;
import com.nimbusds.oauth2.sdk.util.JSONObjectUtils;
import com.nimbusds.oauth2.sdk.util.date.DateWithTimeZoneOffset;
import com.nimbusds.openid.connect.sdk.assurance.evidences.attachment.Attachment;


/**
 * Vouch used as identity evidence.
 *
 * <p>Related specifications:
 *
 * <ul>
 *     <li>OpenID Connect for Identity Assurance 1.0, section 5.1.1.3.
 * </ul>
 */
public class VouchEvidence extends IdentityEvidence {
        
        
        /**
         * The vouch validation method.
         */
        private final ValidationMethod validationMethod;
        
        
        /**
         * The person verification method.
         */
        private final VerificationMethod verificationMethod;
        
        
        /**
         * The identity verifier if not the OpenID provider itself.
         */
        private final IdentityVerifier verifier;
        
        
        /**
         * The vouch verification timestamp.
         */
        private final DateWithTimeZoneOffset time;
        
        
        /**
         * The attestation details.
         */
        private final Attestation attestation;
        
        
        /**
         * Creates a new vouch evidence.
         *
         * @param validationMethod   The vouch validation method, {@code null} 
         *                           if not specified.
         * @param verificationMethod The person verification method,
         *                           {@code null} if not specified.
         * @param verifier           Optional verifier if not the OpenID
         *                           provider itself, {@code null} if none.
         * @param time               The vouch verification timestamp,
         *                           {@code null} if not specified.
         * @param attestation        The attestation, {@code null} if not
         *                           specified.
         * @param attachments        The optional attachments, {@code null} if
         *                           not specified.
         */
        public VouchEvidence(final ValidationMethod validationMethod,
                             final VerificationMethod verificationMethod,
                             final IdentityVerifier verifier,
                             final DateWithTimeZoneOffset time,
                             final Attestation attestation,
                             final List<Attachment> attachments) {
                super(IdentityEvidenceType.VOUCH, attachments);
                this.validationMethod = validationMethod;
                this.verificationMethod = verificationMethod;
                this.time = time;
                this.verifier = verifier;
                this.attestation = attestation;
        }
        
        
        /**
         * Returns the vouch validation method.
         *
         * @return The vouch validation method, {@code null} if not
         *         specified.
         */
        public ValidationMethod getValidationMethod() {
                return validationMethod;
        }
        
        
        /**
         * Returns the person verification method.
         *
         * @return The person verification method, {@code null} if not
         *         specified.
         */
        public VerificationMethod getVerificationMethod() {
                return verificationMethod;
        }
        
        
        /**
         * Returns the optional verifier if not the OpenID provider itself.
         *
         * @return The optional verifier if not the OpenID provider itself,
         *         {@code null} if none.
         */
        public IdentityVerifier getVerifier() {
                return verifier;
        }
        
        
        /**
         * Returns the vouch verification timestamp.
         *
         * @return The vouch verification timestamp, {@code null} if not
         *         specified.
         */
        public DateWithTimeZoneOffset getVerificationTime() {
                return time;
        }
        
        
        /**
         * Returns the attestation.
         *
         * @return The attestation, {@code null} if not specified.
         */
        public Attestation getAttestation() {
                return attestation;
        }
        
        
        @Override
        public JSONObject toJSONObject() {
                JSONObject o = super.toJSONObject();
                if (getValidationMethod() != null) {
                        o.put("validation_method", getValidationMethod().toJSONObject());
                }
                if (getVerificationMethod() != null) {
                        o.put("verification_method", getVerificationMethod().toJSONObject());
                }
                if (getVerifier() != null) {
                        o.put("verifier", getVerifier().toJSONObject());
                }
                if (getVerificationTime() != null) {
                        o.put("time", getVerificationTime().toISO8601String());
                }
                if (getAttestation() != null) {
                        o.put("attestation", getAttestation().toJSONObject());
                }
                return o;
        }
        
        
        @Override
        public boolean equals(Object o) {
                if (this == o) return true;
                if (!(o instanceof VouchEvidence)) return false;
                VouchEvidence that = (VouchEvidence) o;
                return Objects.equals(getValidationMethod(), that.getValidationMethod()) &&
                        Objects.equals(getVerificationMethod(), that.getVerificationMethod()) &&
                        Objects.equals(getVerifier(), that.getVerifier()) &&
                        Objects.equals(getVerificationTime(), that.getVerificationTime()) &&
                        Objects.equals(getAttestation(), that.getAttestation());
        }
        
        
        @Override
        public int hashCode() {
                return Objects.hash(
                        getValidationMethod(),
                        getVerificationMethod(),
                        getVerifier(),
                        getVerificationTime(),
                        getAttestation()
                );
        }
        
        
        /**
         * Parses a vouch evidence from the specified JSON object.
         *
         * @param jsonObject The JSON object. Must not be {@code null}.
         *
         * @return The vouch evidence.
         *
         * @throws ParseException If parsing failed.
         */
        public static VouchEvidence parse(final JSONObject jsonObject)
                throws ParseException {
                
                ensureType(IdentityEvidenceType.VOUCH, jsonObject);
                
                ValidationMethod validationMethod = null;
                if (jsonObject.get("validation_method") != null) {
                        validationMethod = ValidationMethod.parse(JSONObjectUtils.getJSONObject(jsonObject, "validation_method"));
                }
                
                VerificationMethod verificationMethod = null;
                if (jsonObject.get("verification_method") != null) {
                        verificationMethod = VerificationMethod.parse(JSONObjectUtils.getJSONObject(jsonObject, "verification_method"));
                }
                
                IdentityVerifier verifier = null;
                if (jsonObject.get("verifier") != null) {
                        verifier = IdentityVerifier.parse(JSONObjectUtils.getJSONObject(jsonObject, "verifier"));
                }
                
                DateWithTimeZoneOffset time = null;
                if (jsonObject.get("time") != null) {
                        time = DateWithTimeZoneOffset.parseISO8601String(JSONObjectUtils.getString(jsonObject, "time"));
                }
                
                Attestation attestation = null;
                if (jsonObject.get("attestation") != null) {
                        attestation = Attestation.parse(JSONObjectUtils.getJSONObject(jsonObject, "attestation"));
                }
                
                List<Attachment> attachments = null;
                if (jsonObject.get("attachments") != null) {
                        attachments = Attachment.parseList(JSONObjectUtils.getJSONArray(jsonObject, "attachments"));
                }
                
                return new VouchEvidence(validationMethod, verificationMethod, verifier, time, attestation, attachments);
        }
}