/* Copyright (c) 2002-2012 Croteam Ltd. 
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as published by
the Free Software Foundation


This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */

#include "StdAfx.h"
#include "Camera.h"

class CCameraPos {
public:
  TIME cp_tmTick;
  FLOAT cp_fSpeed;
  FLOAT3D cp_vPos;
  ANGLE3D cp_aRot;
  ANGLE cp_aFOV;
};

BOOL _bCameraOn=FALSE;
CTFileStream _strScript;
BOOL _bInitialized;
FLOAT _fStartTime;
CCameraPos _cp0;
CCameraPos _cp1;
CCameraPos _cp;

// camera control
INDEX cam_bRecord           = FALSE;
static INDEX cam_bMoveForward      = FALSE;
static INDEX cam_bMoveBackward     = FALSE;
static INDEX cam_bMoveLeft         = FALSE;
static INDEX cam_bMoveRight        = FALSE;
static INDEX cam_bMoveUp           = FALSE;
static INDEX cam_bMoveDown         = FALSE;
static INDEX cam_bTurnBankingLeft  = FALSE;
static INDEX cam_bTurnBankingRight = FALSE;
static INDEX cam_bZoomIn           = FALSE;
static INDEX cam_bZoomOut          = FALSE;
static INDEX cam_bZoomDefault      = FALSE;
static INDEX cam_bResetToPlayer    = FALSE;
static INDEX cam_bSnapshot         = FALSE;
static INDEX cam_fSpeed            = 1;

// camera functions
void CAM_Init(void)
{
  _pShell->DeclareSymbol("user INDEX cam_bRecord;",           &cam_bRecord);
  _pShell->DeclareSymbol("user INDEX cam_bMoveForward;",      &cam_bMoveForward);
  _pShell->DeclareSymbol("user INDEX cam_bMoveBackward;",     &cam_bMoveBackward);
  _pShell->DeclareSymbol("user INDEX cam_bMoveLeft;",         &cam_bMoveLeft);
  _pShell->DeclareSymbol("user INDEX cam_bMoveRight;",        &cam_bMoveRight);
  _pShell->DeclareSymbol("user INDEX cam_bMoveUp;",           &cam_bMoveUp);
  _pShell->DeclareSymbol("user INDEX cam_bMoveDown;",         &cam_bMoveDown);
  _pShell->DeclareSymbol("user INDEX cam_bTurnBankingLeft;",  &cam_bTurnBankingLeft);
  _pShell->DeclareSymbol("user INDEX cam_bTurnBankingRight;", &cam_bTurnBankingRight);
  _pShell->DeclareSymbol("user INDEX cam_bZoomIn;",           &cam_bZoomIn);
  _pShell->DeclareSymbol("user INDEX cam_bZoomOut;",          &cam_bZoomOut);
  _pShell->DeclareSymbol("user INDEX cam_bZoomDefault;",      &cam_bZoomDefault);
  _pShell->DeclareSymbol("user INDEX cam_bSnapshot;",         &cam_bSnapshot);
  _pShell->DeclareSymbol("user INDEX cam_bResetToPlayer;",    &cam_bResetToPlayer);
  _pShell->DeclareSymbol("user INDEX cam_fSpeed;",            &cam_fSpeed);
}

BOOL CAM_IsOn(void)
{
  return _bCameraOn;
}

void ReadPos(CCameraPos &cp)
{
  try {
    CTString strLine;
    _strScript.GetLine_t(strLine);
    strLine.ScanF("%g: %g: %g %g %g:%g %g %g:%g", 
      &cp.cp_tmTick,
      &cp.cp_fSpeed,
      &cp.cp_vPos(1), &cp.cp_vPos(2), &cp.cp_vPos(3),
      &cp.cp_aRot(1), &cp.cp_aRot(2), &cp.cp_aRot(3),
      &cp.cp_aFOV);

  } catch (const char *strError) {
    CPrintF("Camera: %s\n", (const char *)strError);
  }
}
void WritePos(CCameraPos &cp)
{
  try {
    CTString strLine;
    strLine.PrintF("%g: %g: %g %g %g:%g %g %g:%g", 
      _pTimer->GetLerpedCurrentTick()-_fStartTime,
      1.0f,
      cp.cp_vPos(1), cp.cp_vPos(2), cp.cp_vPos(3),
      cp.cp_aRot(1), cp.cp_aRot(2), cp.cp_aRot(3),
      cp.cp_aFOV);
    _strScript.PutLine_t(strLine);

  } catch (const char *strError) {
    CPrintF("Camera: %s\n", (const char *)strError);
  }
}
void SetSpeed(FLOAT fSpeed)
{
  CTString str;
  str.PrintF("dem_fRealTimeFactor = %g;", fSpeed);
  _pShell->Execute(str);
}

void CAM_Start(const CTFileName &fnmDemo)
{
  _bCameraOn = FALSE;
  CTFileName fnmScript = fnmDemo.NoExt()+".ini";
  if( cam_bRecord) {
    try {
      _strScript.Create_t(fnmScript);
    } catch (const char *strError) {
      CPrintF("Camera: %s\n", (const char *)strError);
      return;
    };
    _cp.cp_vPos = FLOAT3D(0,0,0);
    _cp.cp_aRot = ANGLE3D(0,0,0);
    _cp.cp_aFOV = 90.0f;
    _cp.cp_fSpeed = 1;
    _cp.cp_tmTick = 0.0f;
  } else {
    try {
      _strScript.Open_t(fnmScript);
    } catch (const char *strError) {
      (void)strError;
      return;
    };
  }
  _bCameraOn = TRUE;
  _bInitialized = FALSE;
}
void CAM_Stop(void)
{
  if (_bCameraOn) {
    _strScript.Close();
  }
  _bCameraOn = FALSE;
}

void CAM_Render(CEntity *pen, CDrawPort *pdp)
{
  if( cam_bRecord) {
    if (!_bInitialized) {
      _bInitialized = TRUE;
      SetSpeed(1.0f);
      _fStartTime = _pTimer->CurrentTick();
    }
    FLOATmatrix3D m;
    MakeRotationMatrixFast(m, _cp.cp_aRot);
    FLOAT3D vX, vY, vZ;
    vX(1) = m(1,1); vX(2) = m(2,1); vX(3) = m(3,1);
    vY(1) = m(1,2); vY(2) = m(2,2); vY(3) = m(3,2);
    vZ(1) = m(1,3); vZ(2) = m(2,3); vZ(3) = m(3,3);

    _cp.cp_aRot(1)-=_pInput->GetAxisValue(MOUSE_X_AXIS)*0.5f;
    _cp.cp_aRot(2)-=_pInput->GetAxisValue(MOUSE_Y_AXIS)*0.5f;
    
    if( cam_bMoveForward)      { _cp.cp_vPos -= vZ *cam_fSpeed; };
    if( cam_bMoveBackward)     { _cp.cp_vPos += vZ *cam_fSpeed; };
    if( cam_bMoveLeft)         { _cp.cp_vPos -= vX *cam_fSpeed; };
    if( cam_bMoveRight)        { _cp.cp_vPos += vX *cam_fSpeed; };
    if( cam_bMoveUp)           { _cp.cp_vPos += vY *cam_fSpeed; };
    if( cam_bMoveDown)         { _cp.cp_vPos -= vY *cam_fSpeed; };
    if( cam_bTurnBankingLeft)  { _cp.cp_aRot(3) += 10.0f; };
    if( cam_bTurnBankingRight) { _cp.cp_aRot(3) -= 10.0f; };
    if( cam_bZoomIn)           { _cp.cp_aFOV -= 1.0f; };
    if( cam_bZoomOut)          { _cp.cp_aFOV += 1.0f; };
    if( cam_bZoomDefault)      { _cp.cp_aFOV  = 90.0f; };
    Clamp( _cp.cp_aFOV, 10.0f, 150.0f);

    if( cam_bResetToPlayer) {
      _cp.cp_vPos = pen->GetPlacement().pl_PositionVector;
      _cp.cp_aRot = pen->GetPlacement().pl_OrientationAngle;
    }

    if( cam_bSnapshot) {
      cam_bSnapshot = FALSE;
      WritePos(_cp);
    }

  } else {
    if (!_bInitialized) {
      _bInitialized = TRUE;
      ReadPos(_cp0);
      ReadPos(_cp1);
      SetSpeed(_cp0.cp_fSpeed);
      _fStartTime = _pTimer->CurrentTick();
    }
    TIME tmNow = _pTimer->GetLerpedCurrentTick()-_fStartTime;
    if (tmNow>_cp1.cp_tmTick) {
      _cp0 = _cp1;
      ReadPos(_cp1);
      SetSpeed(_cp0.cp_fSpeed);
    }
    FLOAT fRatio = (tmNow-_cp0.cp_tmTick)/(_cp1.cp_tmTick-_cp0.cp_tmTick);

    _cp.cp_vPos = Lerp(_cp0.cp_vPos, _cp1.cp_vPos, fRatio);
    _cp.cp_aRot = Lerp(_cp0.cp_aRot, _cp1.cp_aRot, fRatio);
    _cp.cp_aFOV = Lerp(_cp0.cp_aFOV, _cp1.cp_aFOV, fRatio);
  }

  CPlacement3D plCamera;
  plCamera.pl_PositionVector = _cp.cp_vPos;
  plCamera.pl_OrientationAngle = _cp.cp_aRot;

  // init projection parameters
  CPerspectiveProjection3D prPerspectiveProjection;
  prPerspectiveProjection.FOVL() = _cp.cp_aFOV;
  prPerspectiveProjection.ScreenBBoxL() = FLOATaabbox2D(
    FLOAT2D(0.0f, 0.0f), FLOAT2D((float)pdp->GetWidth(), (float)pdp->GetHeight())
  );
  prPerspectiveProjection.AspectRatioL() = 1.0f;
  prPerspectiveProjection.FrontClipDistanceL() = 0.3f;

  CAnyProjection3D prProjection;
  prProjection = prPerspectiveProjection;

  // set up viewer position
  prProjection->ViewerPlacementL() = plCamera;
  // render the view
  RenderView(*pen->en_pwoWorld, *(CEntity*)NULL, prProjection, *pdp);
}
