using System;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using Ringtoets.Piping.IO.SoilProfile;

namespace Ringtoets.Piping.IO.Test.TestHelpers
{
    /// <summary>
    /// This class helps to create parameters for testing the <see cref="SoilLayer2DReader"/>.
    /// </summary>
    public static class StringGeometryHelper
    {
        /// <summary>
        /// Takes a <paramref name="str"/> which describes a XML document and returns 
        /// an <see cref="XDocument"/> from this.
        /// </summary>
        /// <param name="str">The <see cref="string"/> to convert to an <see cref="XDocument"/>.</param>
        /// <returns>The <see cref="XDocument"/> constructed from <paramref name="str"/>.</returns>
        /// <exception cref="ArgumentNullException">Thrown when <paramref name="str"/> is <c>null</c>.</exception>
        /// <exception cref="XmlException">Thrown when <paramref name="str"/> does not describe
        /// a valid XML document.</exception>
        public static XDocument GetXmlDocument(string str)
        {
            return XDocument.Load(new MemoryStream(GetByteArray(str)));
        }

        /// <summary>
        /// Takes a <paramref name="str"/> and returns an <see cref="Array"/> of <see cref="byte"/>,
        /// which contains the same information as the original <paramref name="str"/>.
        /// </summary>
        /// <param name="str">The <see cref="string"/> to convert to an <see cref="Array"/> of 
        /// <see cref="byte"/>.</param>
        /// <returns>The <see cref="Array"/> of <see cref="byte"/> constructed from 
        /// <paramref name="str"/>.</returns>
        public static byte[] GetByteArray(string str)
        {
            byte[] bytes = new byte[str.Length * sizeof(char)];
            Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
            return bytes;
        } 
    }
}