using System;
using System.IO;
using System.Reflection;

namespace Deltares.Standard
{
    public static class Common
    {
        /// <summary>
        /// Extracts an embedded file out of a given assembly.
        /// </summary>
        /// <param name="assemblyName">The namespace of you assembly.</param>
        /// <param name="fileName">The name of the file to extract.</param>
        /// <returns>A stream containing the file data.</returns>
        public static Stream GetEmbeddedFile(string assemblyName, string fileName)
        {
            try
            {
                Assembly a = Assembly.Load(assemblyName);
                Stream str = a.GetManifestResourceStream(assemblyName + "." + fileName);

                if (str == null)
                    throw new Exception("Could not locate embedded resource '" + fileName + "' in assembly '" + assemblyName + "'");
                return str;
            }
            catch (Exception e)
            {
                throw new Exception(string.Format("{0}: {1}", assemblyName, e.Message));
            }
        }

        /// <summary>
        /// Extracts an embedded file out of a given assembly.
        /// </summary>
        /// <param name="resourceName">The name of the resource which normally is the namespace of you assembly and the file.</param>
        /// <returns>A stream containing the file data.</returns>
        public static Stream GetEmbeddedFile(Assembly assembly, string resourceName)
        {
            try
            {
                Stream str = assembly.GetManifestResourceStream(resourceName);

                if (str == null)
                    throw new Exception(
                        string.Format("Could not locate embedded resource '{0}' in assembly '{1}'",
                                      resourceName, assembly.GetName()));
                return str;
            }
            catch (Exception e)
            {
                throw new Exception(string.Format("{0}: {1}", assembly.GetName(), e.Message));
            }
        }
    }
}