using System;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

using System.Text;

using System.Threading.Tasks;

using System.Runtime.Serialization;

using System.Windows.Forms;

using Ear = SharpLib.Ear;

using Hid = SharpLib.Hid;

namespace SharpDisplayManager

{

    [DataContract]

    [Ear.AttributeObject(Id = "Event.Hid", Name = "HID", Description = "Handle input from Keyboards and Remotes.")]

    public class EventHid: Ear.Event

    {

        public EventHid()

        {

        }

        [DataMember]

        public ushort UsagePage { get; set; }

        [DataMember]

        public ushort UsageCollection { get; set; }

        [DataMember]

        public ushort Usage { get; set; }

        [DataMember]

        public Keys Key { get; set; }

        [DataMember]

        [Ear.AttributeObjectProperty

            (

            Id = "HID.Keyboard.IsKeyUp",

            Name = "Key Up",

            Description = "Key up if set, key down otherwise."

            )]

        public bool IsKeyUp { get; set; } = false;

        [DataMember]

        public bool IsMouse { get; set; } = false;

        [DataMember]

        public bool IsKeyboard { get; set; } = false;

        [DataMember]

        public bool IsGeneric { get; set; } = false;

        [DataMember]

        public bool HasModifierShift { get; set; } = false;

        [DataMember]

        public bool HasModifierControl { get; set; } = false;

        [DataMember]

        public bool HasModifierAlt { get; set; } = false;

        [DataMember]

        public bool HasModifierWindows { get; set; } = false;

        [DataMember]

        public string UsageName { get; set; } = "Press a key";

        protected override void DoConstruct()

        {

            base.DoConstruct();

            UpdateDynamicProperties();

        }

        private void UpdateDynamicProperties()

        {

        }

        /// <summary>

        /// Make sure we distinguish between various configuration of this event 

        /// </summary>

        /// <returns></returns>

        public override string Brief()

        {

            string brief = AttributeName + ": ";

            if (!IsValid())

            {

                brief += "Press a key";

                return brief;

            }

            if (IsKeyboard)

            {

                brief += Key.ToString();

                if (HasModifierAlt)

                {

                    brief += " + ALT";

                }

                if (HasModifierControl)

                {

                    brief += " + CTRL";

                }

                if (HasModifierShift)

                {

                    brief += " + SHIFT";

                }

                if (HasModifierWindows)

                {

                    brief += " + WIN";

                }

            }

            else if (IsGeneric)

            {

                brief += UsageName;

            }

            if (IsKeyUp)

            {

                brief += " (UP)";

            }

            else

            {

                brief += " (DOWN)";

            }

            return brief;

        }

        /// <summary>

        ///

        /// </summary>

        /// <param name="obj"></param>

        /// <returns></returns>

        public override bool Equals(object obj)

        {

            if (obj is EventHid)

            {

                EventHid e = (EventHid)obj;

                return e.Key == Key

                    && e.Usage == Usage

                    && e.UsagePage == UsagePage

                    && e.UsageCollection == UsageCollection

                    && e.IsKeyUp == IsKeyUp

                    && e.IsGeneric == IsGeneric

                    && e.IsKeyboard == IsKeyboard

                    && e.IsMouse == IsMouse

                    && e.HasModifierAlt == HasModifierAlt

                    && e.HasModifierControl == HasModifierControl

                    && e.HasModifierShift == HasModifierShift

                    && e.HasModifierWindows == HasModifierWindows;

            }

            return false;

        }

        /// <summary>

        /// 

        /// </summary>

        protected override void OnStateLeave()

        {

            if (CurrentState == State.Edit)

            {

                // Leaving edit mode

                // Unhook HID events

                Program.HidHandler.OnHidEvent -= HandleHidEvent;

            }

        }

        /// <summary>

        /// 

        /// </summary>

        protected override void OnStateEnter()

        {

            if (CurrentState == State.Edit)

            {

                // Enter edit mode

                // Hook-in HID events

                Program.HidHandler.OnHidEvent += HandleHidEvent;

            }

        }

        /// <summary>

        /// Here we receive HID events from our HID library.

        /// </summary>

        /// <param name="aSender"></param>

        /// <param name="aHidEvent"></param>

        public void HandleHidEvent(object aSender, SharpLib.Hid.Event aHidEvent)

        {

            if (CurrentState != State.Edit

                || aHidEvent.IsMouse

                || aHidEvent.IsButtonUp

                || !aHidEvent.IsValid

                || aHidEvent.IsBackground

                || aHidEvent.IsRepeat

                || aHidEvent.IsStray)

            {

                return;

            }

            PrivateCopy(aHidEvent);

            //

            //Tell observer the object itself changed

            OnPropertyChanged("Brief");

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="aHidEvent"></param>

        public void Copy(Hid.Event aHidEvent)

        {

            PrivateCopy(aHidEvent);

            //We need the key up/down too here

            IsKeyUp = aHidEvent.IsButtonUp;

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="aHidEvent"></param>

        private void PrivateCopy(Hid.Event aHidEvent)

        {

            //Copy for scan

            UsagePage = aHidEvent.UsagePage;

            UsageCollection = aHidEvent.UsageCollection;

            IsGeneric = aHidEvent.IsGeneric;

            IsKeyboard = aHidEvent.IsKeyboard;

            IsMouse = aHidEvent.IsMouse;

            if (IsGeneric)

            {

                if (aHidEvent.Usages.Count > 0)

                {

                    Usage = aHidEvent.Usages[0];

                    UsageName = aHidEvent.UsageName(0);

                }

                Key = Keys.None;

                HasModifierAlt = false;

                HasModifierControl = false;

                HasModifierShift = false;

                HasModifierWindows = false;

            }

            else if (IsKeyboard)

            {

                Usage = 0;

                Key = aHidEvent.VirtualKey;

                HasModifierAlt = aHidEvent.HasModifierAlt;

                HasModifierControl = aHidEvent.HasModifierControl;

                HasModifierShift = aHidEvent.HasModifierShift;

                HasModifierWindows = aHidEvent.HasModifierWindows;

            }

        }

        /// <summary>

        /// 

        /// </summary>

        /// <returns></returns>

        public override bool IsValid()

        {

            return IsGeneric || IsKeyboard;

        }

    }

}