#region License

/*
 * Copyright 2002-2010 the original author or authors.
 *
 * 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.
 */

#endregion

#region Imports

using System;
using System.IO;
using System.Text;

using Spring.Core.IO;

#endregion

namespace Spring.Objects.Factory.Xml 
{
    /// <summary>
    /// Centralised resource getter for loading all of those XML object
    /// definition files used in the XML based object factory tests.
    /// </summary>
    /// <author>Rick Evans (.NET)</author>
    /// <author>Erich Eichinger (.NET)</author>
    public class ReadOnlyXmlTestResource : IResource 
    {
        private readonly IResource underlyingResource;
        private const string TestDataFolder = "Data";

        /// <summary>
        /// Creates a new instance of the
        /// <see cref="Spring.Objects.Factory.Xml.ReadOnlyXmlTestResource"/> class.
        /// </summary>
        /// <param name="fileName">
        /// The filename/resourcename (e.g. foo.txt) of the XML file containing the object
        /// definitions.
        /// </param>
        public ReadOnlyXmlTestResource (string fileName)
        {
            if (ConfigurableResourceLoader.HasProtocol(fileName))
            {
                ConfigurableResourceLoader loader = new ConfigurableResourceLoader();
                underlyingResource = loader.GetResource(fileName);
            }
            else
            {
                underlyingResource = new FileSystemResource(fileName);
            }
        }

        /// <summary>
        /// Creates a new instance of the
        /// <see cref="Spring.Objects.Factory.Xml.ReadOnlyXmlTestResource"/> class.
        /// </summary>
        /// <param name="fileName">
        /// The filename/resourcename (e.g. foo.txt) of the XML file containing the object
        /// definitions.
        /// </param>
        /// <param name="associatedTestType">
        /// The <see cref="System.Type"/> of the test class utilising said file.
        /// </param>
        public ReadOnlyXmlTestResource (string fileName, Type associatedTestType)
            : this (ReadOnlyXmlTestResource.GetFilePath (fileName, associatedTestType))
        {
        }

        public IResource CreateRelative(string relativePath)
        {
            return this.underlyingResource.CreateRelative(relativePath);
        }

        public bool IsOpen
        {
            get { return this.underlyingResource.IsOpen; }
        }

        public Uri Uri
        {
            get { return this.underlyingResource.Uri; }
        }

        public FileInfo File
        {
            get { return this.underlyingResource.File; }
        }

        public string Description
        {
            get { return this.underlyingResource.Description; }
        }

        public bool Exists
        {
            get { return this.underlyingResource.Exists; }
        }

        public Stream InputStream
        {
            get { return this.underlyingResource.InputStream; }
        }

        public static string GetFilePath (string fileName, Type associatedTestType) 
        {
            if (associatedTestType == null) 
            {
                return fileName;
            }

            // check filesystem
            StringBuilder path = new StringBuilder (TestDataFolder).Append (Path.DirectorySeparatorChar.ToString());
            path.Append (associatedTestType.Namespace.Replace (".", Path.DirectorySeparatorChar.ToString()));
            path.Append (Path.DirectorySeparatorChar.ToString()).Append (fileName);

            FileInfo file = new FileInfo(path.ToString());
            if (file.Exists)
            {
                return path.ToString ();
            }
            else
            {
                // interpret as assembly resource
                fileName = "assembly://" + associatedTestType.Assembly.FullName + "/" + associatedTestType.Namespace
                           + "/" + fileName;
                return fileName;
            }
        }

        public override string ToString()
        {
            return Description;
        }
    }
}
