/*********
 * Filename:      ClESkyController.cs
 * Description:   ARCHA Project - E-Sky EK2-0406A Mode 2 (Left Throttle) Controller Helper Class
 * Author:        Marc Vieira Cardinal
 * Creation Date: October 11, 2008
 * Revision Date: November 09, 2008
 * Web:           http://blog.ncode.ca
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.DirectX.DirectInput;

namespace ARCHAGroundStation
{
    class ClESkyController
    {
        private Device joystickDevice;  //The directx joystick device handle
        private JoystickState state;    //Last polled state

        private ClESkyController() //Private constructor
        {
        }

        public ClESkyController(System.Windows.Forms.Form p_parentForm) //Main and only valid constructor
        {
            //Find all the GameControl devices that are attached.
            DeviceList gameControllerList = Manager.GetDevices(DeviceClass.GameControl, EnumDevicesFlags.AttachedOnly);

            //Check that we have at least one device.
            if (gameControllerList.Count > 0)
            {
                //This loop will iterate though all the joystick devices and find one that has a name that begins with "PPM"
                while (gameControllerList.MoveNext())
                {
                    DeviceInstance deviceInstance = (DeviceInstance)gameControllerList.Current;

                    if (deviceInstance.ProductName.Substring(0, 3) == "PPM")
                    {
                        // create a device from this controller.
                        joystickDevice = new Device(deviceInstance.InstanceGuid);
                        joystickDevice.SetCooperativeLevel(p_parentForm, CooperativeLevelFlags.Background | CooperativeLevelFlags.NonExclusive);
                        break;
                    }
                }
            }

            //Did we find a ppm device?
            if (joystickDevice == null)
                throw new Exception("ERROR: PPM device not found!");

            //Tell DirectX that this is a Joystick.
            joystickDevice.SetDataFormat(DeviceDataFormat.Joystick);

            //Finally, acquire the device.
            joystickDevice.Acquire();

            //Find the capabilities of the joystick
            DeviceCaps cps = joystickDevice.Caps;
            //Number of Axes
            System.Console.WriteLine("Joystick Axis: " + cps.NumberAxes);
            //Number of Buttons
            System.Console.WriteLine("Joystick Buttons: " + cps.NumberButtons);
            //Number of PoV hats
            System.Console.WriteLine("Joystick PoV hats: " + cps.NumberPointOfViews);        
        }

        //Getter for the Roll joystick
        public int GetRoll()
        {
            return state.X;
        }

        //Getter for the Pitch joystick
        public int GetPitch()
        {
            return state.Y;
        }

        //Getter for the Yaw joystick
        public int GetYaw()
        {
            return state.Ry;
        }

        //Getter for the Throttle joystick
        public int GetThrottle()
        {
            return state.Z;
        }

        //Called by an external heartbeat process, this will update the State variable with the current joystick state
        public void Poll()
        {
            try
            {
                //Poll the joystick
                joystickDevice.Poll();

                //Update the joystick state variable
                state = joystickDevice.CurrentJoystickState;
            }
            catch (Exception err)
            {
                //An error has occured...
                System.Console.WriteLine(err.Message);
            }
        }   
    }
}