using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Management.Automation;
using System.Management.Automation.Provider;
using Intel.Management.Mei;
using Intel.Management.Wsman;
using Intel.Management.PSModule.Amt;

namespace Intel.Management.PSModule.Heci
{
    class LocalService : DriveContainer
    {

        enum ControlModeType
        {
            NotProvisioned=0,
            Client=1,
            Admin=2,
        }

        enum CertChainStatus
        {
            NotStarted = 0,
            InProgress = 1,
            Complete = 2,
        }

        class HostSetup : DriveContainer
        {
            HECIClass _heci;
            WsmanConnection _conn;
            string _hash;

            public HostSetup(HECIClass heci,DriveItem parent)
                : base ("Setup",parent)
            {
                _heci = heci;
            }

            public override void GetChildItems(ChildWriter writer)
            {
                if (_conn == null)
                {
                    _heci.Init();
                    try
                    {
                        string username, password;
                        if (_heci.GetLocalAdminCredentials(out username, out password))
                        {
                            _conn = new WsmanConnection();
                            _conn.SetCredentials(username, password);
                        }
                    }
                    finally
                    {
                        _heci.DeInit();
                    }
                }

                if (_conn == null)
                    throw new NotSupportedException();
                
                IManagedReference refToService = _conn.NewReference("IPS_HostBasedSetupService");
                IManagedInstance serviceObj = refToService.Get();

                string currentMode = serviceObj.GetProperty("CurrentControlMode").ToString();

                List<string> modes = new List<string>();
                foreach (IWsmanItem item in serviceObj.GetProperty("AllowedControlModes"))
                {
                    if (item.ToString().Equals("1"))
                        modes.Add("Client");
                    if (item.ToString().Equals("2"))
                        modes.Add("Admin");
                }

                if (!currentMode.Equals("0")) // the current mode 
                    modes.Add("NotProvisioned");
               
                              
                writer.Add(new DriveItem("AllowedControlModes", modes.ToArray(), this));


                if (!serviceObj.GetProperty("CertChainStatus").IsNull)
                    writer.Add(new DriveItem("CertChainStatus", 
                        (CertChainStatus)int.Parse(serviceObj.GetProperty("CertChainStatus").ToString()), this));


                if (!serviceObj.GetProperty("ConfigurationNonce").IsNull)
                    writer.Add( new DriveItem("ConfigurationNonce",serviceObj.GetProperty("ConfigurationNonce").ToString(), this));


                writer.Add(new SetupMode(
                    (ControlModeType)int.Parse(currentMode),
                    this));

                writer.Add(new SetupPassword(this));
            }

            public void SetAdminPassword(string password)
            {
                IManagedInstance settingsObj = _conn.NewInstance("SELECT * FROM AMT_GeneralSettings");
                string  realm = settingsObj.GetProperty("DigestRealm").ToString();
                MD5 md5 = new MD5CryptoServiceProvider();
                md5.Initialize();
                
                StringBuilder builder = new StringBuilder();
                builder.Append("admin");
                builder.Append(":");
                builder.Append(realm);
                builder.Append(":");
                builder.Append(password);

                _hash = BitConverter.ToString(md5.ComputeHash(Encoding.ASCII.GetBytes(builder.ToString())));
                _hash = _hash.Replace("-", string.Empty);
            }

            public void LocalSetup()
            {
                if (_hash == null)
                    throw new DriveException("NetAdminPassword not set");

                IManagedReference refToService = _conn.NewReference("IPS_HostBasedSetupService");
                
                IManagedInstance inputObj = refToService.CreateMethodInput("Setup");
                inputObj.SetProperty("NetAdminPassEncryptionType", "2");
                inputObj.SetProperty("NetworkAdminPassword", _hash);

                // optional and signing certificate

                IManagedInstance outObj = refToService.InvokeMethod(inputObj);

                string result = outObj.GetProperty("ReturnValue").ToString();
                switch (result)
                {
                    case "0":
                        break;
                    case "1":
                        AmtException.ThrowInvokeError(outObj,"Internal Error");
                        break;
                    case "2":
                        AmtException.ThrowInvokeError(outObj, "Invalid State");
                        break;
                    case "3":
                        AmtException.ThrowInvokeError(outObj, "Invalid Parameter");
                        break;
                    case "4":
                        AmtException.ThrowInvokeError(outObj, "Method Disabled");
                        break;
                    case "5":
                        AmtException.ThrowInvokeError(outObj, "Authentication Faild");
                        break;
                    case "6":
                        AmtException.ThrowInvokeError(outObj, "Flash write limit exceeded");
                        break;
                    default:
                        AmtException.ThrowInvokeError(outObj);
                        break;
                }
 
            }

            public void UnProvision()
            {
                _heci.Init();
                try
                {
                    if (!_heci.UnProvision())
                        throw new InvalidOperationException();
                }
                finally
                {
                    _heci.DeInit();
                }
            }

            public override void Clear()
            {
                _conn = null;
                _hash = null;
                base.Clear();
            }
        }

        class SetupPassword : DriveItem
        {
            public SetupPassword(DriveItem parent)
                : base("NetAdminPassword", string.Empty, parent)
            {
            }

            public override void SetItem(object values, DriveProvider provider)
            {
                HostSetup service = (HostSetup)_parent;
                service.SetAdminPassword(values.ToString());
            }
          
        }

        class SetupMode : DriveItem
        {
        
            public SetupMode(ControlModeType mode, DriveItem parent)
                : base("CurrentControlMode",mode, parent)
            {
            }
            
            public override void SetItem(object values, DriveProvider provider)
            {
                HostSetup service = (HostSetup)_parent;

                string value = values.ToString();
                if (string.Compare(value, "NotProvisioned", true) == 0)
                {
                    service.UnProvision();
                    _value = ControlModeType.NotProvisioned;
                    _parent.Clear();
                }
                else if (string.Compare(value, "Client", true) == 0)
                {
                    service.LocalSetup();
                    _value = ControlModeType.Client;
                }
                else if (string.Compare(value, "Admin", true) == 0)
                {
                    throw new NotImplementedException();
                    //_value = ControlModeType.Admin;
                }
                else
                    throw new FormatException();
            }

          
        }

       




        
        HECIClass _heci;

        public LocalService(DriveItem parent)
            : base("Local",parent)
        {
        }

        public override void GetChildItems(ChildWriter writer)
        {
            if (_heci == null)
            {
                _heci = new HECIClass();
                
            }

            writer.Add(new HostSetup(_heci, this));

            /*_heci.Init();
            try
            {
                HECIClass.ProvisioningState state;
                if (_heci.GetProvisioningState(out state))
                {
                    writer.Add(new ProvisioningState(_heci,state, this));
                }


              
            }
            finally
            {
                _heci.DeInit();
            }*/
        }
    }

}