using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Cosmos.Common.Extensions;
using Cosmos.System.FileSystem.VFS;
using Cosmos.TestRunner;
using Sys = Cosmos.System;

namespace Cosmos.Kernel.Tests.Fat
{
    public class Kernel : Sys.Kernel
    {
        private VFSBase myVFS;

        protected override void BeforeRun()
        {
            Console.WriteLine("Cosmos booted successfully, now start testing");
            myVFS = new Sys.SentinelVFS();
            VFSManager.RegisterVFS(myVFS);
        }

        private global::Cosmos.Debug.Kernel.Debugger mDebugger = new global::Cosmos.Debug.Kernel.Debugger("User", "Test");

        protected override void Run()
        {
            try
            {
                mDebugger.Send("Run");

                bool xTest;
                string xContents;
                Assert.IsTrue(Path.GetDirectoryName(@"0:\test") == @"0:\", @"Path.GetDirectoryName(@'0:\test') == @'0:\'");
                Assert.IsTrue(Path.GetFileName(@"0:\test") == @"test", @"Path.GetFileName(@'0:\test') == @'test'");

                mDebugger.Send("File exist check:");
                xTest = File.Exists(@"0:\Kudzu.txt");
                Assert.IsTrue(xTest, @"\Kudzu.txt not found!");

                mDebugger.Send("Directory exist check:");
                xTest = Directory.Exists(@"0:\test");
                Console.WriteLine("After test");
                Assert.IsTrue(xTest, "Folder does not exist!");

                mDebugger.Send("File contents of Kudzu.txt: ");
                xContents = File.ReadAllText(@"0:\Kudzu.txt");
                mDebugger.Send("Contents retrieved");
                mDebugger.Send(xContents);
                Assert.IsTrue(xContents == "Hello Cosmos", "Contents of Kudzu.txt was read incorrectly!");

                //Test if null or empty string throws exception.
                try
                {
                    using (var xFS = new FileStream(null, FileMode.Open))
                    {
                        xFS.SetLength(5);
                    }
                }
                catch (Exception ex)
                {
                    mDebugger.Send("Exception occurred:" + ex.Message);
                }

                using (var xFS = new FileStream(@"0:\Kudzu.txt", FileMode.Open))
                {
                    xFS.SetLength(5);
                }
                mDebugger.Send("File made smaller");
                xContents = File.ReadAllText(@"0:\Kudzu.txt");
                mDebugger.Send("Contents retrieved");
                mDebugger.Send(xContents);
                Assert.IsTrue(xContents == "Hello", "Contents of Kudzu.txt was read incorrectly!");

                using (var xFS = new FileStream(@"0:\Kudzu.txt", FileMode.Create))
                {
                    xFS.SetLength(5);
                }
                mDebugger.Send("File made smaller");
                xContents = File.ReadAllText(@"0:\Kudzu.txt");
                mDebugger.Send("Contents retrieved");
                mDebugger.Send(xContents);
                Assert.IsTrue(xContents == "Hello", "Contents of Kudzu.txt was read incorrectly!");

                //using (var xFS = new FileStream(@"0:\Kudzu.txt", FileMode.Create))
                //{
                //    mDebugger.Send("Start writing");
                //    var xStr = "Test FAT Write.";
                //    var xBuff = xStr.GetUtf8Bytes(0, (uint) xStr.Length);
                //    xFS.Write(xBuff, 0, xBuff.Length);
                //    mDebugger.Send("---- Data written");
                //    xFS.Position = 0;
                //    xFS.Read(xBuff, 0, xBuff.Length);
                //    mDebugger.Send(xBuff.GetUtf8String(0, (uint)xBuff.Length));
                //}


                //mDebugger.Send("Write to file now");
                //File.WriteAllText(@"0:\Kudzu.txt", "Test FAT write.");
                //mDebugger.Send("Text written");
                //xContents = File.ReadAllText(@"0:\Kudzu.txt");

                //mDebugger.Send("Contents retrieved after writing");
                //mDebugger.Send(xContents);
                //Assert.IsTrue(xContents == "Test FAT write.", "Contents of Kudzu.txt was written incorrectly!");

                TestController.Completed();
            }
            catch (Exception E)
            {
                mDebugger.Send("Exception occurred");
                mDebugger.Send(E.Message);
                TestController.Failed();
            }
        }
    }
}