// CRLIdentifier.cs
//
// XAdES Starter Kit for Microsoft .NET 3.5 (and above)
// 2010 Microsoft France
// Published under the CECILL-B Free Software license agreement.
// (http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt)
// 
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, 
// WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED 
// WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. 
// THE ENTIRE RISK OF USE OR RESULTS IN CONNECTION WITH THE USE OF THIS CODE 
// AND INFORMATION REMAINS WITH THE USER.

using System;
using System.Xml;

namespace Microsoft.Xades
{
    /// <summary>
    /// This class includes the issuer (Issuer element), the time when the CRL
    /// was issued (IssueTime element) and optionally the number of the CRL
    /// (Number element).
    /// The Identifier element can be dropped if the CRL could be inferred from
    /// other information. Its URI attribute could serve to	indicate where the
    /// identified CRL is archived.
    /// </summary>
    public class CRLIdentifier
    {
        #region Private variables
        private string uriAttribute;
        private string issuer;
        private DateTime issueTime;
        private long number;
        #endregion

        #region Public properties
        /// <summary>
        /// The optional URI attribute could serve to indicate where the OCSP
        /// response identified is archived
        /// </summary>
        public string UriAttribute
        {
            get
            {
                return this.uriAttribute;
            }
            set
            {
                this.uriAttribute = value;
            }
        }

        /// <summary>
        /// Issuer of the CRL
        /// </summary>
        public string Issuer
        {
            get
            {
                return this.issuer;
            }
            set
            {
                this.issuer = value;
            }
        }

        /// <summary>
        /// Date of issue of the CRL
        /// </summary>
        public DateTime IssueTime
        {
            get
            {
                return this.issueTime;
            }
            set
            {
                this.issueTime = value;
            }
        }

        /// <summary>
        /// Optional number of the CRL
        /// </summary>
        public long Number
        {
            get
            {
                return this.number;
            }
            set
            {
                this.number = value;
            }
        }
        #endregion

        #region Constructors
        /// <summary>
        /// Default constructor
        /// </summary>
        public CRLIdentifier()
        {
            this.issueTime = DateTime.MinValue;
            this.number = long.MinValue; //Impossible value
        }
        #endregion

        #region Public methods
        /// <summary>
        /// Check to see if something has changed in this instance and needs to be serialized
        /// </summary>
        /// <returns>Flag indicating if a member needs serialization</returns>
        public bool HasChanged()
        {
            bool retVal = false;

            if (!String.IsNullOrEmpty(this.uriAttribute))
            {
                retVal = true;
            }

            if (!String.IsNullOrEmpty(this.issuer))
            {
                retVal = true;
            }

            if (this.issueTime != DateTime.MinValue)
            {
                retVal = true;
            }

            if (this.number != long.MinValue)
            {
                retVal = true;
            }

            return retVal;
        }

        /// <summary>
        /// Load state from an XML element
        /// </summary>
        /// <param name="xmlElement">XML element containing new state</param>
        public void LoadXml(System.Xml.XmlElement xmlElement)
        {
            XmlNamespaceManager xmlNamespaceManager;
            XmlNodeList xmlNodeList;

            if (xmlElement == null)
            {
                throw new ArgumentNullException("xmlElement");
            }
            if (xmlElement.HasAttribute("URI"))
            {
                this.uriAttribute = xmlElement.GetAttribute("URI");
            }

            xmlNamespaceManager = new XmlNamespaceManager(xmlElement.OwnerDocument.NameTable);
            xmlNamespaceManager.AddNamespace("xsd", XadesSignedXml.XadesNamespaceUri);

            xmlNodeList = xmlElement.SelectNodes("xsd:Issuer", xmlNamespaceManager);
            if (xmlNodeList.Count != 0)
            {
                this.issuer = xmlNodeList.Item(0).InnerText;
            }

            xmlNodeList = xmlElement.SelectNodes("xsd:IssueTime", xmlNamespaceManager);
            if (xmlNodeList.Count != 0)
            {
                this.issueTime = XmlConvert.ToDateTime(xmlNodeList.Item(0).InnerText, XmlDateTimeSerializationMode.Local);
            }

            xmlNodeList = xmlElement.SelectNodes("xsd:Number", xmlNamespaceManager);
            if (xmlNodeList.Count != 0)
            {
                this.number = long.Parse(xmlNodeList.Item(0).InnerText);
            }
        }

        /// <summary>
        /// Returns the XML representation of the this object
        /// </summary>
        /// <returns>XML element containing the state of this object</returns>
        public XmlElement GetXml()
        {
            XmlDocument creationXmlDocument;
            XmlElement retVal;
            XmlElement bufferXmlElement;

            creationXmlDocument = new XmlDocument();
            retVal = creationXmlDocument.CreateElement("xades", "CRLIdentifier", XadesSignedXml.XadesNamespaceUri);

            retVal.SetAttribute("URI", this.uriAttribute);

            if (!String.IsNullOrEmpty(this.issuer))
            {
                bufferXmlElement = creationXmlDocument.CreateElement("xades", "Issuer", XadesSignedXml.XadesNamespaceUri);
                bufferXmlElement.InnerText = this.issuer;
                retVal.AppendChild(bufferXmlElement);
            }

            if (this.issueTime != DateTime.MinValue)
            {
                bufferXmlElement = creationXmlDocument.CreateElement("xades", "IssueTime", XadesSignedXml.XadesNamespaceUri);
                bufferXmlElement.InnerText = Convert.ToString(this.issueTime.ToString("s"));
                retVal.AppendChild(bufferXmlElement);
            }

            if (this.number != long.MinValue)
            {
                bufferXmlElement = creationXmlDocument.CreateElement("xades", "Number", XadesSignedXml.XadesNamespaceUri);
                bufferXmlElement.InnerText = this.number.ToString();
                retVal.AppendChild(bufferXmlElement);
            }

            return retVal;
        }
        #endregion
    }
}