/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    Stars.exe
    FILE:         TrackIR.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    TrackIR head tracker interface class
*/

#include "MemDebug.h"
#include "TrackIR.h"
#include "NPClient.h"
#include "NPClientWraps.h"

#include "Game.h"
#include "Text.h"

// +--------------------------------------------------------------------+

const double TRACK_TOP     =  -8000;
const double TRACK_BOTTOM  =   8000;
const double TRACK_LEFT    =  16000;
const double TRACK_RIGHT   = -16000;
const double TRACK_XYZ     =  24000;

// +--------------------------------------------------------------------+

static Text GetDllFromRegistry()
{
    Text  dllLoc;
    BYTE  dllBuf[1024];
    DWORD dllLen = 0;
    HKEY  hkey   = 0;

    ZeroMemory(dllBuf, sizeof(dllBuf));

    RegOpenKeyEx(HKEY_CURRENT_USER,
    "Software\\NaturalPoint\\NATURALPOINT\\NPClient Location",
    0,
    KEY_QUERY_VALUE,
    &hkey);

    if (hkey) {
        dllLen  = 1024;

        LONG result =
        RegQueryValueEx(hkey,
        "Path",
        NULL,
        NULL,
        dllBuf,
        &dllLen);

        if (result == ERROR_SUCCESS && dllLen > 0)
        dllLoc = (const char*) dllBuf;

        RegCloseKey(hkey);
    }

    return dllLoc;
}

static const char* NPErrString(NPRESULT r)
{
    switch (r) {
    case NP_OK:                      return "OK";
    case NP_ERR_DEVICE_NOT_PRESENT:  return "Device not present";
    case NP_ERR_UNSUPPORTED_OS:      return "Unsupported O/S";
    case NP_ERR_INVALID_ARG:         return "Invalid argument";
    case NP_ERR_DLL_NOT_FOUND:       return "NaturalPoint DLL not found";
    case NP_ERR_NO_DATA:             return "No data available";
    case NP_ERR_INTERNAL_DATA:       return "Internal error";
    }

    return "Unknown error code";
}

// +--------------------------------------------------------------------+

TrackIR::TrackIR() :
running(false), frame_signature(0),
az(0), el(0), x(0), y(0), z(0)
{
    Print("*** NaturalPoint Game Client Initialization ***\n");

    // Hook up the NaturalPoint game client DLL using the wrapper module
    NPRESULT result;
    Text dllPath = GetDllFromRegistry();

    // Initialize the NPClient interface
    result = NPClient_Init(dllPath);
    if (result == NP_OK) {
        Print("NPClient - Initialize successful.\n");
    }
    else {
        Print("NPClient - Unable to initialize interface: %s\n", NPErrString(result));
        return;
    }

    // Register the app's window handle
    result = NP_RegisterWindowHandle(Game::GetHWND());

    if (result == NP_OK) {
        Print("NPClient - Window handle registration successful.\n");
    }
    else {
        Print("NPClient - Error registering window handle: %s\n", NPErrString(result));
        return;
    }

    // Query the NaturalPoint software version
    unsigned short wNPClientVer;
    result = NP_QueryVersion( &wNPClientVer );

    if (result == NP_OK) {
        Print("NPClient - NaturalPoint software version: %d.%02d\n", (wNPClientVer >> 8), (wNPClientVer & 0x00FF));
    }
    else {
        Print("NPClient - Error querying NaturalPoint software version: %s\n", NPErrString(result));
    }


    // It is *required* that your application registers the Developer ID
    // assigned by NaturalPoint!

    // Your assigned developer ID needs to be inserted below!
#define NP_DEVELOPER_ID 6401

    // NOTE : The title of your project must show up
    // in the list of supported titles shown in the Profiles
    // tab of the TrackIR software, if it does not then the
    // TrackIR software will *not* transmit data to your
    // application. If your title is not present in the list,
    // you may need to have the TrackIR software perform a
    // game list update (to download support for new Developer IDs)
    // using the menu item under the "Help" or "Update" menu.

    NP_RegisterProgramProfileID(NP_DEVELOPER_ID);

    unsigned int DataFields = 0;
    DataFields |= NPPitch;
    DataFields |= NPYaw;

    NP_RequestData(DataFields);

    result = NP_StopCursor();
    if (result == NP_OK)
    Print("NPClient - Cursor stopped.\n");
    else
    Print("NPClient - Error stopping cursor: %s\n", NPErrString(result));


    result = NP_StartDataTransmission();
    if (result == NP_OK) {
        Print("NPClient - Data transmission started.\n");
        running = true;
    }
    else {
        Print("NPClient - Error starting data transmission: %s\n", NPErrString(result));
    }

}

TrackIR::~TrackIR()
{
    if (running) {
        Print("NaturalPoint Game Client Shutdown\n");

        NP_StopDataTransmission();
        NP_UnregisterWindowHandle();
    }
}

// +--------------------------------------------------------------------+

DWORD
TrackIR::ExecFrame()
{
    TRACKIRDATA tid;

    // Go get the latest data
    NPRESULT result = NP_GetData( &tid );

    if (result == NP_OK) {
        // Got data to process ...
        running = true;

        // compare the last frame signature to the current one
        // if they are not the same then new data has arrived since then

        if (tid.wNPStatus == NPSTATUS_REMOTEACTIVE) {
            if (frame_signature != tid.wPFrameSignature) {
                double pitch = tid.fNPPitch;
                double yaw   = tid.fNPYaw;

                if (pitch < 0) {
                    el = pitch / TRACK_TOP;
                }
                else {
                    el = -pitch / TRACK_BOTTOM;
                }

                if (yaw < 0) {
                    az = yaw / TRACK_RIGHT;
                }
                else {
                    az = -yaw / TRACK_LEFT;
                }

                x = tid.fNPX / TRACK_XYZ * -1;
                y = tid.fNPY / TRACK_XYZ;
                z = tid.fNPZ / TRACK_XYZ * -1;

                if (z < -0.25) z = -0.25;

                frame_signature = tid.wPFrameSignature;
            }
            else {
                // Either there is no tracking data, the user has
                // paused the trackIR, or the call happened before
                // the TrackIR was able to update the interface
                // with new data

                az *= 0.75;
                el *= 0.75;
                x  *= 0.75;
                y  *= 0.75;
                z  *= 0.75;

                result = NP_ERR_NO_DATA;
            }
        }
        else {
            // The user has set the device out of trackIR Enhanced Mode
            // and into Mouse Emulation mode with the hotkey
            result  = NP_ERR_NO_DATA;
            running = false;
        }
    }

    return result;
}