using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Cosmos.Hardware;
using Cosmos.Kernel;

namespace MatthijsTest
{
    public class MyATADevice: BlockDevice
    {
        #region Inherited members
        public override uint BlockSize
        {
            get
            {
                return 512;
            }
        }

        public override uint BlockCount
        {
            get
            {
                return mSectorCount;
            }
        }

        public override void ReadBlock(uint aBlock, byte[] aContents)
        {                                   
            throw new NotImplementedException();
        }

        public override unsafe void WriteBlock(uint aBlock, byte[] aContents)
        {
            AddressSpace xAddrSpace;
            fixed (byte* xContents = &aContents[0])
            {
                xAddrSpace = new ManagedMemorySpace(aContents);
                Console.Write("Correct offset: ");
                Interrupts.WriteNumber((uint)xContents, 32);
                Console.WriteLine("");
                Console.Write("Guessed offset: ");
                Interrupts.WriteNumber(xAddrSpace.Offset, 32);
                Console.WriteLine("");

                if (xAddrSpace.Offset != ((uint)xContents))
                {
                    Console.WriteLine("Offset not correct");
                }
            }
            //var xAddrSpace = new MemoryAddressSpace(xAddr, 512);
            //for (uint i = 0; i < 512; i++)
            //{
            //    xAddrSpace.Write8(i, aContents[i]);
            //}
            mController.WriteSector_LBA28(mIsMaster, aBlock, xAddrSpace);
        }

        public override string Name
        {
            get
            {
                return mName;
            }
        }

        private string mName;
        #endregion

        #region Initialization
        internal MyATADevice(MyATAController controller, string name, bool isMaster)
        {
            mName = name;
            mController = controller;
            mIsMaster = isMaster;
            Initialize();
        }

        private void Initialize()
        {
            var xMemSpace = new ManagedMemorySpace(512);
            mController.RealReadBlock_PIO(xMemSpace);
            SupportsLBA48 = (xMemSpace.Read16(83 * 2) & 1 << 10) != 0; // byte 10 of word 83 specifies if LBA48 is supported
            SupportedUDMA = xMemSpace.Read8(88 * 2);
            mSectorCount = xMemSpace.Read32(60 * 2); // word 60 & 61 contain the number of LBA28 sectors
            SupportsLBA28 = mSectorCount != 0;
        }

        public byte SupportedUDMA
        {
            get;
            private set;
        }

        public bool SupportsLBA28
        {
            get;
            private set;
        }

        public bool SupportsLBA48
        {
            get;
            private set;
        }

        private uint mSectorCount;
        
        private readonly MyATAController mController;
        private readonly bool mIsMaster;
        #endregion
    }
}