using System.IO;
using Cosmos.TestRunner;
using Cosmos.Debug.Kernel;
using Cosmos.Common.Extensions;
using System;

namespace Cosmos.Kernel.Tests.Fat.System.IO
{
    class DirectoryInfoTest
    {
        /// <summary>
        /// Tests System.IO.DirectoryInfo plugs.
        /// </summary>
        public static void Execute(Debugger mDebugger)
        {
            var xPath = @"0:\DiTest";

            mDebugger.Send("START TEST: Create");

            var xDi = new DirectoryInfo(xPath);
            Assert.IsFalse(xDi.Exists, "DirectoryInfo.Exists should be false when directory doesn't exist");

            xDi.Create();
            //TODO: 
            //Assert.IsFalse(xDi.Exists, "DirectoryInfo.Create should not modify DirectoryInfo.Exists");

            xDi = new DirectoryInfo(xPath);
            Assert.IsTrue(xDi.Exists, "DirectoryInfo.Create failed: directory does not exist");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            /* OK the Directory has been created, let's test some Properties */
            mDebugger.Send("START TEST: Get Name");
            Assert.IsTrue(xDi.Name == "DiTest", "DirectoryInfo.Name failed: directory has wrong name");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            mDebugger.Send("START TEST: Get FullName");
            Assert.IsTrue(xDi.FullName == xPath, "DirectoryInfo.FullName failed: directory has wrong path");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            mDebugger.Send("START TEST: Get Parent");
            var xDiParent = xDi.Parent;
            var ExpectedParentFullName = @"0:\";

            Assert.IsTrue(xDiParent.FullName == ExpectedParentFullName, "DirectoryInfo.Parent is wrong");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            mDebugger.Send("START TEST: Get Attributes:");

            // This requires a plug in EnumImpl to work... but it will requires Reflection probably
            //bool isReallyADir = xDi.Attributes.HasFlag(FileAttributes.Directory);
            bool isReallyADir = ((xDi.Attributes & FileAttributes.Directory) == FileAttributes.Directory);
            Assert.IsTrue(isReallyADir == true, "DirectoryInfo.Attributes is wrong: directory NOT a directory.");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            mDebugger.Send("START TEST: CreateSubdirectory");
            var xSubDi = xDi.CreateSubdirectory("SubDir");

            Assert.IsTrue(xSubDi.Exists == true, "DirectoryInfo.CreateSubdirectory failed");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            mDebugger.Send("START TEST: GetDirectories on xDi");
            var xDirs = xDi.GetDirectories();
            Assert.IsTrue(xDirs != null, "GetDirectories() failed it returns null array");
            Assert.IsTrue(xDirs.Length != 0, "GetDirectories() failed it returns empty array");
            Assert.AreEqual(xDirs[0].FullName, xSubDi.FullName, "GetDirectories() failed");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            /* Now redo the same test but for xSubDir we expect an empty array as the Directory is indeed empty */
            mDebugger.Send("START TEST: GetDirectories on xSubDi");
            xDirs = xSubDi.GetDirectories();
            Assert.IsTrue(xDirs != null, "GetDirectories() failed returns null array");
            Assert.IsTrue(xDirs.Length == 0, "GetDirectories() failed does not returns empty array");
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            // XXX EnumerateDirectories() and EnumerateFiles() can not be neither tested as IL2CPU crashes!
            //var xEnumDir = xDi.EnumerateDirectories();

            mDebugger.Send("START TEST: GetFiles on xDi");
 
            var expectedFilePath = @"0:\DiTest\test";
            File.Create(expectedFilePath);

            var xFiles = xDi.GetFiles();
          
            Assert.IsTrue(xFiles[0].FullName == expectedFilePath, "GetFiles() does not return the expected files");
            mDebugger.Send("END TEST");

            mDebugger.Send("START TEST: GetFileSystemInfos on xDi");
            var xEntries = xDi.GetFileSystemInfos();

            /* This the correct way to implement dir :-) */
            // There 2 entries on xDi a subdir and a file, let's check that xEntries has lenght 2 first */
            Assert.IsTrue(xEntries.Length == 2, "There are not 2 entries inside xDi");
            // OK let's see if they are the expected ones...
            foreach (var xEntry in xEntries)
            {
                if (xEntry is DirectoryInfo)
                    Assert.IsTrue(xEntry.FullName == xSubDi.FullName, "Directory found but with wrong name");
                if (xEntry is FileInfo)
                    Assert.IsTrue(xEntry.FullName == expectedFilePath, "File found but with wrong name");
            }
            mDebugger.Send("END TEST");
            mDebugger.Send("");

            // TODO we need to implement Move at VFS level to have this working
#if false
            mDebugger.Send("START TEST: Moving SubDir");


            xSubDi.MoveTo("SubDirMoved");

            // xSubDir continues to refer to the old path so the directory does not exist anymore
            Assert.IsTrue(xSubDi.Exists == false, "DirectoryInfo.MoveTo failed directory is yet in the old path");

            // Let's change the reference of xSubDi to the new path now we should find the Directory
            xSubDi = new DirectoryInfo("SubDirMoved");
            Assert.IsTrue(xSubDi.Exists == true, "DirectoryInfo.MoveTo failed directory does not exist in the new path");
            mDebugger.Send("END TEST");
#endif
            mDebugger.Send("START TEST: Delete");
            xDi.Delete(recursive: true);
            //Assert.IsTrue(xDi.Exists, "DirectoryInfo.Delete should not modify DirectoryInfo.Exists");

            xDi = new DirectoryInfo(xPath);
            Assert.IsFalse(xDi.Exists, "DirectoryInfo.Delete failed: directory continues exists");
          
            mDebugger.Send("END TEST");

            // DateTime is broken see: https://github.com/CosmosOS/Cosmos/pull/553/files for some fixes
#if false
            mDebugger.Send("START TEST: Get Attributes:");
            var CreationTime = xDi.CreationTimeUtc;
            mDebugger.Send("END TEST: CreationTime:" + CreationTime);
#endif

            mDebugger.Send("");
        }
    }
}