//
//
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Xml.Serialization;

namespace Deltares.Standard
{
    /// <summary>
    /// Types that implement this interface has a seperate data object 
    /// that needs to be serialized instead of the implementer itself
    /// </summary>
    /// <remarks>
    /// The type implementing this interface act as an adapter without subclassing (Decorator pattern). 
    /// It can have a complete different data contract interface and can delegate calls to the members
    /// of the object being serialized
    /// </remarks>
    /// <typeparam name="T"></typeparam>
    public interface ISerializableObject<T>
    {
        /// <summary>
        /// Should return the data object to serialize
        /// </summary>
        /// <returns></returns>
        T GetDataObject();

        /// <summary>
        /// Sets the data object which needs to be serialized later
        /// Data properties in the implementer should implemenent setters and getters on this object
        /// </summary>
        /// <param name="obj"></param>
        void SetDataObject(T obj);
    }

    /// <summary>
    /// A common exception which should be trown when validating the schema and mandatory fields are not set.
    /// </summary>
    [Serializable]
    public class NotSchemaCompliantException : Exception
    {
        public NotSchemaCompliantException()
        {
        }

        public NotSchemaCompliantException(string message) : base(message)
        {
        }

        public NotSchemaCompliantException(string message, Exception inner) : base(message, inner)
        {
        }

        protected NotSchemaCompliantException(
            SerializationInfo info,
            StreamingContext context)
            : base(info, context)
        {
        }
    }

    /// <summary>
    /// Defines a contract for the Serializer.
    /// </summary>
    public interface INamespaceProvider
    {
        /// <summary>
        /// Defines a method which should return the target namespaces
        /// </summary>
        /// <returns>The qualified name</returns>
        XmlSerializerNamespaces GetNamespaces();
    }

    public static class Serialization
    {
        /// <summary>
        /// Serializes the target to file
        /// </summary>
        /// <typeparam name="T">The target type that implements ISchemaSerializer</typeparam>
        /// <param name="target">The target instance</param>
        /// <param name="fileName">The name of the file to serialze to</param>
        public static void SerializeToFile<T>(T target, string fileName)
        {
            XmlSerializerNamespaces namespaces = null;
            var ns = target as INamespaceProvider;
            if (ns != null)
                namespaces = ns.GetNamespaces();

            var xml = new System.Xml.Serialization.XmlSerializer(typeof (T));
            using (var fs = new FileStream(fileName, FileMode.Create))
            {
                if (namespaces != null)
                    xml.Serialize(fs, target, namespaces);
                else
                    xml.Serialize(fs, target);
            }
        }

        /// <summary>
        /// Serializes the target to string
        /// </summary>
        /// <typeparam name="T">The target type</typeparam>
        /// <param name="target">The target instance</param>
        /// <returns>the target serialized as a xml string</returns>
        public static string SerializeToString<T>(T target)
        {
            string result = "";
            XmlSerializerNamespaces namespaces = null;
            var ns = target as INamespaceProvider;
            if (ns != null)
                namespaces = ns.GetNamespaces();

            var xml = new System.Xml.Serialization.XmlSerializer(typeof (T));
            using (var sw = new StringWriter())
            {
                if (namespaces != null)
                    xml.Serialize(sw, target, namespaces);
                else
                    xml.Serialize(sw, target);

                result = sw.ToString();
            }
            return result;
        }

        /// <summary>
        /// Deserializes the target object class from file
        /// </summary>
        /// <typeparam name="T">The target type that implements ISchemaSerializer</typeparam>
        /// <param name="fileName">The name of the file to deserialize from</param>
        /// <returns>The target object graph</returns>
        public static T DeserializeFromFile<T>(string fileName) where T : class
        {
            T result = default(T);
            var xml = new System.Xml.Serialization.XmlSerializer(typeof (T));

            using (var fs = new FileStream(fileName, FileMode.Open))
            {
                result = xml.Deserialize(fs) as T;
            }
            return result;
        }

        /// <summary>
        /// Deserializes the target object class from file
        /// </summary>
        /// <typeparam name="T">The target type that implements ISchemaSerializer</typeparam>
        /// <param name="fileName">The name of the file to deserialize from</param>
        /// <returns>The target object graph</returns>
        public static string DeserializeFromFileToString<T>(string fileName) where T : class
        {
            T result = default(T);
            var xml = new System.Xml.Serialization.XmlSerializer(typeof (T));
            using (var fs = new FileStream(fileName, FileMode.Open))
            {
                result = xml.Deserialize(fs) as T;
            }
            return SerializeToString<T>(result);
        }

        /// <summary>
        /// Deserializes the target object from string
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="xmlData"></param>
        /// <returns></returns>
        public static T DeserializeFromString<T>(string xmlData) where T : class
        {
            T result = default(T);
            var xml = new System.Xml.Serialization.XmlSerializer(typeof (T));
            using (var sr = new StringReader(xmlData))
            {
                result = xml.Deserialize(sr) as T;
            }

            return result;
        }
    }
}