/*
 * OpenClonk, http://www.openclonk.org
 *
 * Copyright (c) 1998-2000, 2003-2004  Matthes Bender
 * Copyright (c) 2001-2003, 2005-2007, 2009-2010  Sven Eberhardt
 * Copyright (c) 2002, 2004  Peter Wortmann
 * Copyright (c) 2005-2006, 2008-2009  Günther Brammer
 * Copyright (c) 2006, 2010  Armin Burgmeier
 * Copyright (c) 2010  Tobias Zwick
 * Copyright (c) 2001-2009, RedWolf Design GmbH, http://www.clonk.de
 *
 * Portions might be copyrighted by other authors who have contributed
 * to OpenClonk.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * See isc_license.txt for full license and disclaimer.
 *
 * "Clonk" is a registered trademark of Matthes Bender.
 * See clonk_trademark_license.txt for full license.
 */

/* Mouse input */

#include <C4Include.h>
#include <C4MouseControl.h>

#include <C4DefList.h>
#include <C4Viewport.h>
#include <C4Object.h>
#include <C4Command.h>
#include <C4Application.h>
#include <C4FullScreen.h>
#include <C4Gui.h>
#include <C4Landscape.h>
#include <C4Game.h>
#include <C4Player.h>
#include "C4ChatDlg.h"
#include <C4GraphicsResource.h>
#include <C4GraphicsSystem.h>
#include <C4PlayerList.h>
#include <C4GameObjects.h>
#include <C4GameControl.h>

const int32_t C4MC_Drag_None            = 0,
              C4MC_Drag_Selecting       = 1,
              C4MC_Drag_Moving          = 2,
              //C4MC_Drag_Menu          = 3,
              //C4MC_Drag_MenuScroll    = 4,
              C4MC_Drag_Construct       = 5,
              C4MC_Drag_Script          = 6,
              C4MC_Drag_Unhandled       = 7,

              C4MC_Selecting_Unknown  = 0;

const int32_t C4MC_Cursor_Region      = 0,
              C4MC_Cursor_Crosshair   = 1,
              C4MC_Cursor_Enter       = 2,
              C4MC_Cursor_Grab        = 3,
              C4MC_Cursor_Chop        = 4,
              C4MC_Cursor_Dig         = 5,
              C4MC_Cursor_Build       = 6,
              C4MC_Cursor_Select      = 7,
              C4MC_Cursor_Object      = 8,
              C4MC_Cursor_Ungrab      = 9,
              C4MC_Cursor_Up          = 10,
              C4MC_Cursor_Down        = 11,
              C4MC_Cursor_Left        = 12,
              C4MC_Cursor_Right       = 13,
              C4MC_Cursor_UpLeft      = 14,
              C4MC_Cursor_UpRight     = 15,
              C4MC_Cursor_DownLeft    = 16,
              C4MC_Cursor_DownRight   = 17,
              C4MC_Cursor_JumpLeft    = 18,
              C4MC_Cursor_JumpRight   = 19,
              C4MC_Cursor_Drop        = 20,
              C4MC_Cursor_ThrowRight  = 21,
              C4MC_Cursor_Put         = 22,
              //C4MC_Cursor_DragMenu    = 23,
              C4MC_Cursor_Vehicle     = 24,
              C4MC_Cursor_VehiclePut  = 25,
              C4MC_Cursor_ThrowLeft   = 26,
              C4MC_Cursor_DragDrop    = 26,
              C4MC_Cursor_Point       = 27,
              C4MC_Cursor_DigObject   = 28,
              C4MC_Cursor_Help        = 29,
              C4MC_Cursor_DigMaterial = 30,
              C4MC_Cursor_Add         = 31,
              C4MC_Cursor_Construct   = 32,
              C4MC_Cursor_Attack      = 33,
              C4MC_Cursor_Nothing     = 34;

const int32_t C4MC_Time_on_Target     = 10;

C4MouseControl::C4MouseControl()
{
	Default();
}

C4MouseControl::~C4MouseControl()
{
	Clear();
}

void C4MouseControl::Default()
{
	Active=false;
	Player=NO_OWNER;
	pPlayer=NULL;
	Viewport=NULL;
	Cursor=DownCursor=0;
	Caption.Clear();
	IsHelpCaption=false;
	CaptionBottomY=0;
	VpX=VpY=0;
	DownX=DownY=DownOffsetX=DownOffsetY=0;
	ViewX=ViewY=0;
	GuiX=GuiY=GameX=GameY=0;
	ShowPointX=ShowPointY=-1;
	LeftButtonDown=RightButtonDown=false;
	LeftDoubleIgnoreUp=false;
	ButtonDownOnSelection=false;
	Visible=true;
	InitCentered=false;
	Help=false;
	FogOfWar=false;
	DragID=C4ID::None;
	DragObject=NULL;
	KeepCaption=0;
	Drag=C4MC_Drag_None; DragSelecting=C4MC_Selecting_Unknown;
	Selection.Default();
	TargetObject=DownTarget=NULL;
	TimeOnTargetObject=0;
	ControlDown=false;
	ShiftDown=false;
	Scrolling=false;
	ScrollSpeed=10;
	TargetRegion=NULL;
	DownRegion.Default();
	DragImageDef=NULL;
	DragImageObject=NULL;
	fMouseOwned = true; // default mouse owned
	fctViewport.Default();
}

void C4MouseControl::Clear()
{
	Active = false;
	Selection.Clear();
	UpdateClip(); // reset mouse clipping!
}

void C4MouseControl::Execute()
{

	if (!Active || !fMouseOwned) return;

	// Scrolling/continuous update
	if (Scrolling || !::Game.iTick5)
	{
		WORD wKeyState=0;
		if (Application.IsControlDown()) wKeyState|=MK_CONTROL;
		if (Application.IsShiftDown()) wKeyState|=MK_SHIFT;
		Move(C4MC_Button_None,VpX,VpY,wKeyState);
	}
}

bool C4MouseControl::Init(int32_t iPlayer)
{
	Clear();
	Default();
	Active = true;
	Player = iPlayer;
	InitCentered = false;
	UpdateClip();
	return true;
}

void C4MouseControl::ClearPointers(C4Object *pObj)
{
	if (TargetObject==pObj) TargetObject=NULL;
	if (DownTarget==pObj) DownTarget=NULL;
	if (DragObject==pObj)
	{
		DragObject=NULL;
		Drag=C4MC_Drag_None;
		DragImageDef=NULL;
		DragImageObject=NULL;
	}
	Selection.ClearPointers(pObj);
}

bool C4MouseControl::IsViewport(C4Viewport *pViewport)
{
	return (Viewport==pViewport);
}

void C4MouseControl::UpdateClip()
{
#ifdef _DEBUG
	// never in debug
	return;
#endif
#ifdef USE_WIN32_WINDOWS
	// fullscreen only
	if (Application.isEditor) return;
	// application or mouse control not active? remove any clips
	if (!Active || !Application.Active || ::pGUI->HasMouseFocus()) { ClipCursor(NULL); return; }
	// get controlled viewport
	C4Viewport *pVP=::Viewports.GetViewport(Player);
	if (!pVP) { ClipCursor(NULL); return; }
	// adjust size by viewport size
	RECT vpRct;
	vpRct.left=pVP->OutX; vpRct.top=pVP->OutY; vpRct.right=pVP->OutX+pVP->ViewWdt; vpRct.bottom=pVP->OutY+pVP->ViewHgt;
	// adjust by window pos
	RECT rtWindow;
	if (GetWindowRect(FullScreen.hWindow, &rtWindow))
	{
		vpRct.left += rtWindow.left; vpRct.top += rtWindow.top;
		vpRct.right += rtWindow.left; vpRct.bottom+= rtWindow.top;
	}
	ClipCursor(&vpRct);
	// and inform GUI
	::pGUI->SetPreferredDlgRect(C4Rect(pVP->OutX, pVP->OutY, pVP->ViewWdt, pVP->ViewHgt));
#endif
	//StdWindow manages this.
}

void C4MouseControl::Move(int32_t iButton, int32_t iX, int32_t iY, DWORD dwKeyFlags, bool fCenter)
{
	// Active
	if (!Active || !fMouseOwned) return;
	// Execute caption
	if (KeepCaption) KeepCaption--; else { Caption.Clear(); IsHelpCaption=false; CaptionBottomY=0; }
	// Check player
	if (Player>NO_OWNER)
	{
		pPlayer=::Players.Get(Player);
		if (!pPlayer) { Active=false; return; }
	}
	else
		pPlayer = NULL;
	// Check viewport
	if (!(Viewport=::Viewports.GetViewport(Player))) return;
	// get view position
	C4Rect rcViewport = Viewport->GetOutputRect();
	fctViewport.Set(NULL, rcViewport.x, rcViewport.y, rcViewport.Wdt, rcViewport.Hgt);
	ViewX=Viewport->ViewX; ViewY=Viewport->ViewY;
	fctViewportGame = Viewport->last_game_draw_cgo;
	fctViewportGUI = Viewport->last_gui_draw_cgo;
	// First time viewport attachment: center mouse
#ifdef USE_WIN32_WINDOWS
	if (!InitCentered || fCenter)
	{
		iX = Viewport->ViewWdt/2;
		iY = Viewport->ViewHgt/2;
		if (!Application.isEditor)
		{
			int32_t iMidX = Viewport->OutX + iX;
			int32_t iMidY = Viewport->OutY + iY;
			RECT rtWindow;
			if (GetWindowRect(Application.pWindow->hWindow, &rtWindow))
			{
				iMidX += rtWindow.left; iMidY += rtWindow.top;
			}
			SetCursorPos(iMidX, iMidY);
		}
		InitCentered = true;
	}
#else
	if (!InitCentered || fCenter)
	{
		iX = Viewport->ViewWdt/2;
		iY = Viewport->ViewHgt/2;
		if (!Application.isEditor)
		{
			//int32_t iMidX = Viewport->OutX + iX;
			//int32_t iMidY = Viewport->OutY + iY;
			//FIXMESetCursorPos(iMidX, iMidY);
		}
		InitCentered = true;
	}
#endif
	// passive mode: scrolling and player buttons only
	if (IsPassive())
	{
		if (iButton != C4MC_Button_Wheel)
		{
			VpX=iX; VpY=iY;
			GameX=ViewX+VpX/Viewport->Zoom; GameY=ViewY+VpY/Viewport->Zoom;
			GuiX=float(VpX)/Viewport->GetGUIZoom(); GuiY=float(VpY)/Viewport->GetGUIZoom();
		}
		UpdateTargetRegion();
		UpdateScrolling();
		if (iButton == C4MC_Button_LeftDown) LeftDown();
		else if (iButton == C4MC_Button_LeftUp) LeftUp();
		else UpdateCursorTarget();
		return;
	}

	if (iButton != C4MC_Button_Wheel)
	{
		// Position
		VpX=iX; VpY=iY;
		GameX=ViewX+VpX/Viewport->Zoom; GameY=ViewY+VpY/Viewport->Zoom;
		GuiX=float(VpX)/Viewport->GetGUIZoom(); GuiY=float(VpY)/Viewport->GetGUIZoom();
		// Control state
		ControlDown=false; if (dwKeyFlags & MK_CONTROL) ControlDown=true;
		ShiftDown=false; if (dwKeyFlags & MK_SHIFT) ShiftDown=true;
		// Target region
		UpdateTargetRegion();
		// Scrolling
		UpdateScrolling();
		// Fog of war
		UpdateFogOfWar();

		// Blocked by fog of war: evaluate button up, dragging and region controls only
		if (FogOfWar && Drag == C4MC_Drag_None && !TargetRegion)
		{
			// Left button up
			if (iButton==C4MC_Button_LeftUp)
			{
				LeftButtonDown=false;
				// End any drag
				Drag=C4MC_Drag_None;
			}
			// Right button up
			if (iButton==C4MC_Button_RightUp)
			{
				RightButtonDown=false;
			}
		}
	}

	// Move execution by button/drag status
	switch (iButton)
	{
		//------------------------------------------------------------------------------------------
	case C4MC_Button_None:
		switch (Drag)
		{
		case C4MC_Drag_Unhandled: break; // nothing to do
		case C4MC_Drag_None: DragNone(); break;
		case C4MC_Drag_Selecting: DragSelect(); break;
		case C4MC_Drag_Moving: DragMoving(); break;
		case C4MC_Drag_Construct: DragConstruct(); break;
		case C4MC_Drag_Script: DragScript(); break;
		}
		break;
		//------------------------------------------------------------------------------------------
	case C4MC_Button_LeftDown: LeftDown(); break;
		//------------------------------------------------------------------------------------------
	case C4MC_Button_LeftUp: LeftUp(); break;
		//------------------------------------------------------------------------------------------
	case C4MC_Button_LeftDouble: LeftDouble(); break;
		//------------------------------------------------------------------------------------------
	case C4MC_Button_RightDown: RightDown(); break;
		//------------------------------------------------------------------------------------------
	case C4MC_Button_RightUp: RightUp(); break;
		//------------------------------------------------------------------------------------------
	case C4MC_Button_Wheel: Wheel(dwKeyFlags); break;
	}

	// script handling of mouse control for everything but regular movement (which is sent at control frame intervals only)
	if (iButton != C4MC_Button_None)
		// not if blocked by selection object
		if (!TargetRegion && !TargetObject)
			// safety (can't really happen in !IsPassive, but w/e
			if (pPlayer && pPlayer->ControlSet)
			{
				if (pPlayer->ControlSet->IsMouseControlAssigned(iButton))
				{
					int wheel_dir = 0;
					if (iButton == C4MC_Button_Wheel) wheel_dir = (short)(dwKeyFlags >> 16);
					pPlayer->Control.DoMouseInput(0 /* only 1 mouse supported so far */, iButton, GameX, GameY, GuiX, GuiY, ControlDown, ShiftDown, Application.IsAltDown(), wheel_dir);
				}
			}
}

void C4MouseControl::DoMoveInput()
{
	// current mouse move to input queue
	// do sanity checks
	if (!Active || !fMouseOwned) return;
	if (!(pPlayer=::Players.Get(Player))) return;
	if (!pPlayer->ControlSet) return;
	if (!pPlayer->ControlSet->IsMouseControlAssigned(C4MC_Button_None)) return;
	pPlayer->Control.DoMouseInput(0 /* only 1 mouse supported so far */, C4MC_Button_None, GameX, GameY, GuiX, GuiY, ControlDown, ShiftDown, Application.IsAltDown(), 0);
}

void C4MouseControl::Draw(C4TargetFacet &cgo, const ZoomData &GameZoom)
{
	int32_t iOffsetX,iOffsetY;

	ZoomData GuiZoom;
	pDraw->GetZoom(&GuiZoom);

	// Hidden
	if (!Visible || !fMouseOwned) return;

	// Draw selection
	if (!IsPassive())
	{
		Selection.DrawSelectMark(cgo);
	}

	// Draw control
	switch (Drag)
	{
		//------------------------------------------------------------------------------------------
	case C4MC_Drag_None: case C4MC_Drag_Moving: case C4MC_Drag_Construct: case C4MC_Drag_Script: case C4MC_Drag_Unhandled:
		// Hotspot offset: Usually, hotspot is in center
		iOffsetX = GfxR->fctMouseCursor.Wdt/2;
		iOffsetY = GfxR->fctMouseCursor.Hgt/2;
		// calculate the hotspot for the scrolling cursors
		switch (Cursor)
		{
		case C4MC_Cursor_Up: iOffsetY += -GfxR->fctMouseCursor.Hgt/2; break;
		case C4MC_Cursor_Down:iOffsetY += +GfxR->fctMouseCursor.Hgt/2; break;
		case C4MC_Cursor_Left: iOffsetX += -GfxR->fctMouseCursor.Wdt/2; break;
		case C4MC_Cursor_Right: iOffsetX += +GfxR->fctMouseCursor.Wdt/2; break;
		case C4MC_Cursor_UpLeft: iOffsetX += -GfxR->fctMouseCursor.Wdt/2; iOffsetY += -GfxR->fctMouseCursor.Hgt/2; break;
		case C4MC_Cursor_UpRight: iOffsetX += +GfxR->fctMouseCursor.Wdt/2; iOffsetY += -GfxR->fctMouseCursor.Hgt/2; break;
		case C4MC_Cursor_DownLeft: iOffsetX += -GfxR->fctMouseCursor.Wdt/2; iOffsetY += +GfxR->fctMouseCursor.Hgt/2; break;
		case C4MC_Cursor_DownRight: iOffsetX += +GfxR->fctMouseCursor.Wdt/2; iOffsetY += +GfxR->fctMouseCursor.Hgt/2; break;
		}
		// Add mark
		bool fAddMark; fAddMark=false;
		if (ShiftDown)
			if ((Cursor!=C4MC_Cursor_Region) && (Cursor!=C4MC_Cursor_Select) //&& (Cursor!=C4MC_Cursor_DragMenu)
			    && (Cursor!=C4MC_Cursor_JumpLeft) && (Cursor!=C4MC_Cursor_JumpRight))
				if (!IsPassive())
					fAddMark=true;
		// Drag image
		if (DragImageObject || DragImageDef)
		{
			C4DefGraphics* pGfx;
			if(DragImageObject)
				pGfx = DragImageObject->GetGraphics();
			else
				pGfx = &DragImageDef->Graphics;

			// Determine image boundaries
			float ImageWdt;
			float ImageHgt;
			if (pGfx->Type == C4DefGraphics::TYPE_Bitmap)
			{
				C4Def* Def = (DragImageObject ? DragImageObject->Def : DragImageDef);
				ImageWdt = Def->PictureRect.Wdt;
				ImageHgt = Def->PictureRect.Hgt;
			}
			else
			{
				// Note bounding box is in OGRE coordinate system
				ImageWdt = pGfx->Mesh->GetBoundingBox().y2 - pGfx->Mesh->GetBoundingBox().y1;
				ImageHgt = pGfx->Mesh->GetBoundingBox().z2 - pGfx->Mesh->GetBoundingBox().z1;
			}

			// zoom mode: Drag in GUI or Game depending on source object
			bool fIsGameZoom = true;
			if (Drag == C4MC_Drag_Script && DragObject && (DragObject->Category & C4D_Foreground))
				fIsGameZoom = false;
			// drag image in game zoom
			float XDraw, YDraw, ZoomDraw;
			if (fIsGameZoom)
			{
				pDraw->SetZoom(GameZoom);
				XDraw = GameX; YDraw = GameY;
				ZoomDraw = 1.0f;
				// for drag construct: draw rounded to game pixels, because construction site will be placed at rounded game pixel positions
				if (Drag == C4MC_Drag_Construct) { XDraw=floor(XDraw); YDraw=floor(YDraw); }
			}
			else
			{
				ZoomDraw = std::min(64.0f / ImageWdt, 64.0f / ImageHgt);
				XDraw = GuiX; YDraw = GuiY;
			}

			iOffsetX=int(ZoomDraw*ImageWdt/2);
			if (Drag == C4MC_Drag_Construct)
				iOffsetY=int(ZoomDraw*ImageHgt);
			else
				iOffsetY=int(ZoomDraw*ImageHgt/2);

			C4TargetFacet ccgo;
			ccgo.Set(cgo.Surface, XDraw + cgo.X - iOffsetX, YDraw + cgo.Y - iOffsetY, float(ImageWdt)*ZoomDraw, float(ImageHgt)*ZoomDraw);

			// TODO: Take pDef->DragImagePicture into account
			if (DragImageObject)
			{
				uint32_t ColorMod = DragImageObject->ColorMod;
				uint32_t BlitMode = DragImageObject->BlitMode;
				DragImageObject->ColorMod = (Drag == C4MC_Drag_Script) ? 0x7fffffff : (/*DragImagePhase*/0 ? 0x8f7f0000 : 0x1f007f00);
				DragImageObject->BlitMode = C4GFXBLIT_MOD2;
	
				DragImageObject->DrawPicture(ccgo, false, NULL, NULL);

				DragImageObject->ColorMod = ColorMod;
				DragImageObject->BlitMode = BlitMode;
			}
			else
			{
				// draw in special modulation mode
				pDraw->SetBlitMode(C4GFXBLIT_MOD2);
				// draw DragImage in red or green, according to the phase to be used
				pDraw->ActivateBlitModulation((Drag == C4MC_Drag_Script) ? 0x7fffffff : (/*DragImagePhase*/0 ? 0x8f7f0000 : 0x1f007f00));

				DragImageDef->Draw(ccgo, false, pPlayer ? pPlayer->ColorDw : 0xff0000ff, NULL, 0, 0, NULL);

				// reset color
				pDraw->DeactivateBlitModulation();
				pDraw->SetBlitMode(0);
			}

			if (fIsGameZoom) pDraw->SetZoom(GuiZoom);
			// reset cursor hotspot offset for script drawing
			iOffsetX = GfxR->fctMouseCursor.Wdt/2;
			iOffsetY = GfxR->fctMouseCursor.Hgt/2;
		}
		// Cursor
		if ( (!DragImageDef && !DragImageObject) || (Drag == C4MC_Drag_Script))
			GfxR->fctMouseCursor.Draw(cgo.Surface,cgo.X+GuiX-iOffsetX,cgo.Y+GuiY-iOffsetY,Cursor);
		// Point
		if ((ShowPointX!=-1) && (ShowPointY!=-1))
			GfxR->fctMouseCursor.Draw( cgo.Surface,
			                           int32_t(cgo.X+(ShowPointX-cgo.TargetX)*GameZoom.Zoom / GuiZoom.Zoom-GfxR->fctMouseCursor.Wdt/2),
			                           int32_t(cgo.Y+(ShowPointY-cgo.TargetY)*GameZoom.Zoom / GuiZoom.Zoom-GfxR->fctMouseCursor.Hgt/2),
			                           C4MC_Cursor_Point );
		// Add mark
		if (fAddMark)
			GfxR->fctMouseCursor.Draw( cgo.Surface,
			                           int32_t(cgo.X+GuiX-iOffsetX+8),
			                           int32_t(cgo.Y+GuiY-iOffsetY+8),
			                           C4MC_Cursor_Add );
		break;
		//------------------------------------------------------------------------------------------
	case C4MC_Drag_Selecting:
		// Draw frame
		pDraw->DrawFrameDw(cgo.Surface,
		                              int32_t(cgo.X + GuiX),
		                              int32_t(cgo.Y + GuiY),
		                              int32_t(cgo.X + (DownX - cgo.TargetX) * GameZoom.Zoom / GuiZoom.Zoom),
		                              int32_t(cgo.Y + (DownY - cgo.TargetY) * GameZoom.Zoom / GuiZoom.Zoom),
		                              C4RGB(0xca, 0, 0));
		break;
		//------------------------------------------------------------------------------------------
	}

	// Draw caption
	if (Caption)
	{
		if (IsHelpCaption && ::pGUI)
		{
			// Help: Tooltip style
			C4TargetFacet cgoTip; cgoTip = static_cast<const C4Facet &>(cgo);
			C4GUI::Screen::DrawToolTip(Caption.getData(), cgoTip, cgo.X+GuiX, cgo.Y+GuiY);
		}
		else
		{
			// Otherwise red mouse control style
			int32_t iWdt,iHgt;
			::GraphicsResource.FontRegular.GetTextExtent(Caption.getData(), iWdt, iHgt, true);
			pDraw->TextOut(Caption.getData(), ::GraphicsResource.FontRegular, 1.0,
			                           cgo.Surface,
			                           float(cgo.X)+BoundBy<float>(GuiX,float(iWdt)/2+1,float(cgo.Wdt)-iWdt/2-1),
			                           float(cgo.Y)+Min<float>( CaptionBottomY ? float(CaptionBottomY-iHgt-1) : GuiY+13, float(cgo.Hgt-iHgt)),
			                           0xfaFF0000,ACenter);
		}
	}

}

void C4MouseControl::UpdateCursorTarget()
{
	int32_t iLastCursor = Cursor;

	C4Object* OldTargetObject = TargetObject;

	if (Scrolling)
	{
		// Scrolling: no other target
		TargetObject=NULL;
	}
	else if(TargetRegion)
	{
		// On target region
		TargetObject=NULL;
		if (Help) Cursor=C4MC_Cursor_Help;
	}
	else
	{
		// Target object
		TargetObject=GetTargetObject();
		if (TargetObject && FogOfWar && !(TargetObject->Category & C4D_IgnoreFoW)) TargetObject = NULL;

		// Movement
		if (!FogOfWar && !IsPassive()) Cursor=C4MC_Cursor_Crosshair;

		// Target action
		if (TargetObject && !IsPassive())
		{
			// default cursor for object; also set if not in FoW
			Cursor=C4MC_Cursor_Crosshair;

			// select custom region. Can select an object if it does not have the MD_NoClick
			// flag set. If we are currently dragging then selection depends on it being a drop target.
			bool CanSelect;
			if(Drag == C4MC_Drag_Script)
				CanSelect = (TargetObject->GetPropertyInt(P_MouseDrag) & C4MC_MD_DropTarget) != 0;
			else
				CanSelect = (TargetObject->GetPropertyInt(P_MouseDrag) & C4MC_MD_NoClick) == 0;

			if ( (TargetObject->Category & C4D_MouseSelect) && CanSelect)
				Cursor=C4MC_Cursor_Select;
			else
				TargetObject = NULL;
		}

		// Help
		if (Help)
			Cursor=C4MC_Cursor_Help;
		// passive cursor
		else if (IsPassive())
			Cursor=C4MC_Cursor_Region;

		// Time on target: caption
		if (Cursor==iLastCursor)
		{
			TimeOnTargetObject++;
			if (TimeOnTargetObject>=C4MC_Time_on_Target)
			{
				const char* idCaption = 0;
				const char *szName = "";
				bool fDouble = false;
				if (TargetObject) szName=TargetObject->GetName();
				// Target caption by cursor
				switch (Cursor)
				{
				case C4MC_Cursor_Select: idCaption="IDS_CON_SELECT"; break;
				case C4MC_Cursor_Help: idCaption="IDS_CON_NAME"; break;
				}
				// Set caption
				if (idCaption) if (!KeepCaption)
					{
						// Caption by cursor
						Caption.Format(LoadResStr(idCaption), szName);
						if (fDouble) { Caption.AppendChar('|'); Caption.Append(LoadResStr("IDS_CON_DOUBLECLICK")); }
						IsHelpCaption = false;
					}
			}
		}
		else
			TimeOnTargetObject=0;
	}

	// Make a script callback if the object being hovered changes
	if(OldTargetObject != TargetObject)
	{
		// TODO: This might put a heavy load on the network, depending on the number of
		// selectable objects around. If it turns out to be a problem we might want to
		// deduce these hover callbacks client-side instead.
		// Or, make sure to send this at most once per control frame.
		Game.Input.Add(CID_Script, new C4ControlScript(
		                 FormatString("%s(%d,Object(%d),Object(%d),Object(%d))", PSF_MouseHover, (int)Player, OldTargetObject ? (int)(OldTargetObject->Number) : 0, TargetObject ? (int)(TargetObject->Number) : 0, DragObject ? (int)(DragObject->Number) : 0).getData()));
	}
}

int32_t C4MouseControl::UpdateSingleSelection()
{
	// Set single selection if cursor on selection object (clear prior object selection)
	if (TargetObject && (Cursor==C4MC_Cursor_Select))
		{ Selection.Clear(); Selection.Add(TargetObject, C4ObjectList::stNone); }

	// Cursor has moved off single object (or target object) selection: clear selection
	else if (Selection.GetObject())
		if (::Players.Get(Player)->ObjectInCrew(Selection.GetObject())
		    || (Selection.GetObject()->Category & C4D_MouseSelect))
			Selection.Clear();

	return Selection.ObjectCount();
}

void C4MouseControl::UpdateScrolling()
{
	// Assume no scrolling
	Scrolling=false;
	// No scrolling if on region
	if (TargetRegion) return;
	// No scrolling if disabled by player
	if (pPlayer) if (pPlayer->IsViewLocked()) return;
	// Scrolling on border
	if (VpX==0)
		{ Cursor=C4MC_Cursor_Left; ScrollView(-ScrollSpeed/Viewport->Zoom,0,Viewport->ViewWdt/Viewport->Zoom,Viewport->ViewHgt/Viewport->Zoom); Scrolling=true; }
	if (VpY==0)
		{ Cursor=C4MC_Cursor_Up; ScrollView(0,-ScrollSpeed/Viewport->Zoom,Viewport->ViewWdt/Viewport->Zoom,Viewport->ViewHgt/Viewport->Zoom); Scrolling=true; }
	if (VpX==Viewport->ViewWdt-1)
		{ Cursor=C4MC_Cursor_Right; ScrollView(+ScrollSpeed/Viewport->Zoom,0,Viewport->ViewWdt/Viewport->Zoom,Viewport->ViewHgt/Viewport->Zoom); Scrolling=true; }
	if (VpY==Viewport->ViewHgt-1)
		{ Cursor=C4MC_Cursor_Down; ScrollView(0,+ScrollSpeed/Viewport->Zoom,Viewport->ViewWdt/Viewport->Zoom,Viewport->ViewHgt/Viewport->Zoom); Scrolling=true; }
	// Set correct cursor
	if ((VpX==0) && (VpY==0)) Cursor=C4MC_Cursor_UpLeft;
	if ((VpX==Viewport->ViewWdt-1) && (VpY==0)) Cursor=C4MC_Cursor_UpRight;
	if ((VpX==0) && (VpY==Viewport->ViewHgt-1)) Cursor=C4MC_Cursor_DownLeft;
	if ((VpX==Viewport->ViewWdt-1) && (VpY==Viewport->ViewHgt-1)) Cursor=C4MC_Cursor_DownRight;
}

void C4MouseControl::UpdateTargetRegion()
{
	// Assume no region
	TargetRegion=NULL;
	// Find region
	if (!(TargetRegion=Viewport->Regions.Find(GuiX,GuiY))) return;
	// Region found: no target object
	TargetObject=NULL;
	// Cursor
	Cursor=C4MC_Cursor_Region;
	// Stop drag selecting (reset down cursor, too)
	if (Drag==C4MC_Drag_Selecting)
		{ Drag=C4MC_Drag_None; DownCursor=C4MC_Cursor_Nothing; }
	// Caption
	Caption.Copy(TargetRegion->Caption);
	IsHelpCaption = false;
	CaptionBottomY=TargetRegion->Y; KeepCaption=0;
	// Help region caption by region target object; not in menu, because this would be the cursor object
	if (Help)
		if (TargetRegion->Target /*&& Cursor!=C4MC_Cursor_DragMenu*/)
		{
			//if (TargetRegion->Target->Def->GetDesc())
			//	Caption.Format("%s: %s",TargetRegion->Target->GetName(), TargetRegion->Target->Def->GetDesc());
			//else
				Caption.Copy(TargetRegion->Target->GetName());
			IsHelpCaption = true;
		}
	// MoveOverCom (on region change)
	static int32_t iLastRegionX,iLastRegionY;
	if (TargetRegion->MoveOverCom)
	{
		if ((TargetRegion->X!=iLastRegionX) || (TargetRegion->Y!=iLastRegionY))
		{
			iLastRegionX=TargetRegion->X; iLastRegionY=TargetRegion->Y;

			// Control queue
			Game.Input.Add(CID_PlrControl,
			               new C4ControlPlayerControl(Player,TargetRegion->MoveOverCom,TargetRegion->Data));
		}
	}
	else
	{
		iLastRegionX=iLastRegionY=-1;
	}
}

void C4MouseControl::LeftDown()
{
	// Set flag
	LeftButtonDown=true;
	// Store down values (same MoveRightDown -> use StoreDown)
	DownX=GameX; DownY=GameY;
	DownCursor=Cursor;
	DownTarget=TargetObject;
	DownRegion.Default();
	if (TargetRegion)
	{
		DownRegion=(*TargetRegion);
		DownTarget=TargetRegion->Target;
		DownOffsetX=TargetRegion->X-GuiX; DownOffsetY=TargetRegion->Y-GuiY;
	}
}

void C4MouseControl::DragSelect()
{
	// don't select into FoW - simply don't update selection
	if (FogOfWar) return;
	switch (DragSelecting)
	{
	case C4MC_Selecting_Unknown:
		// Determine selection type
		// No selection in engine right now...
		break;
	}
}

void C4MouseControl::LeftUp()
{
	// Update status flag
	LeftButtonDown=false;
	if(!RightButtonDown) DownTarget = NULL;
	// Ignore left up after double click
	if (LeftDoubleIgnoreUp) { LeftDoubleIgnoreUp=false; return; }
	// Evaluate by drag status
	switch (Drag)
	{
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Unhandled: // nobreak
	case C4MC_Drag_None: LeftUpDragNone(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Selecting: ButtonUpDragSelecting(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Moving: ButtonUpDragMoving(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Construct: ButtonUpDragConstruct(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Script: ButtonUpDragScript(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	}
}

void C4MouseControl::DragMoving()
{
	ShowPointX=ShowPointY=-1;

	// do not drag objects into FoW
	if (FogOfWar) { Cursor = C4MC_Cursor_Nothing; return; }

}

void C4MouseControl::DragNone()
{
	// Holding left down
	if (LeftButtonDown)
	{
		switch (Cursor)
		{
			// Hold down on region
		case C4MC_Cursor_Region:
			if (!::Game.iTick5)
				if (DownRegion.HoldCom)
					SendControl(DownRegion.HoldCom);
			break;
		}
	}

	// Cursor movement
	UpdateCursorTarget();
	// Update selection
	UpdateSingleSelection();

	// Button down: begin drag
	if ( (LeftButtonDown || RightButtonDown)
	     && ((Abs(GameX-DownX)>C4MC_DragSensitivity) || (Abs(GameY-DownY)>C4MC_DragSensitivity)) )
	{
		bool fAllowDrag = true;
		switch (DownCursor)
		{
			/*
			// Drag start selecting in landscape
			case C4MC_Cursor_Crosshair:
			Selection.Clear();
			Drag=C4MC_Drag_Selecting; DragSelecting=C4MC_Selecting_Unknown;
			break;
			*/
			// Help: no dragging
		case C4MC_Cursor_Help:
			fAllowDrag = false;
			break;
		}
		// check if target object allows scripted dragging
		if (fAllowDrag && DownTarget && (!FogOfWar || (DownTarget->Category & C4D_IgnoreFoW)))
		{
			C4Object *drag_image_obj; C4ID drag_image_id;

			// Drag only if MD_SOURCE is set and drag image is present
			if ( (DownTarget->GetPropertyInt(P_MouseDrag) & C4MC_MD_DragSource) &&
			      DownTarget->GetDragImage(&drag_image_obj, &drag_image_id))
			{
				Drag=C4MC_Drag_Script;

				if(drag_image_obj) DragImageObject = drag_image_obj;
				else DragImageDef = C4Id2Def(drag_image_id);

				DragObject = DownTarget;
			}
		}

		// dragging somewhere unhandled - mark drag process so moving over a draggable object won't start a drag
		if (Drag == C4MC_Drag_None)
		{
			Drag=C4MC_Drag_Unhandled;
		}
	}
}

void C4MouseControl::LeftDouble()
{
	// Update status flag
	LeftButtonDown=false;
	// Set ignore flag for next left up
	LeftDoubleIgnoreUp=true;
	// Evaluate left double by drag status (can only be C4MC_Drag_None really)
	switch (Drag)
	{
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_None:
		// Double left click (might be on a target)
		break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	}
}

void C4MouseControl::RightDown()
{
	// Update status flag
	RightButtonDown=true;
	// Store down values (same MoveLeftDown -> use StoreDown)
	DownX=GameX; DownY=GameY;
	DownCursor=Cursor;
	DownTarget=TargetObject;
	DownRegion.Default();
	if (TargetRegion)
	{
		DownRegion=(*TargetRegion);
		DownTarget=TargetRegion->Target;
		DownOffsetX=TargetRegion->X-GuiX; DownOffsetY=TargetRegion->Y-GuiY;
	}
}

void C4MouseControl::RightUp()
{
	// Update status flag
	RightButtonDown=false;
	if(!LeftButtonDown) DownTarget = NULL;

	// Evaluate by drag status
	switch (Drag)
	{
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Unhandled: // nobreak
	case C4MC_Drag_None: RightUpDragNone(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Selecting: ButtonUpDragSelecting(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Moving: ButtonUpDragMoving(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Construct: ButtonUpDragConstruct(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	case C4MC_Drag_Script: ButtonUpDragScript(); break;
		// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	}
}

void C4MouseControl::Wheel(DWORD dwFlags)
{
	//short iDelta = (short)(dwFlags >> 16);

	// Normal wheel: control zoom
	if (!ControlDown)
	{
		//if(iDelta > 0) Viewport->ChangeZoom(C4GFX_ZoomStep);
		//if(iDelta < 0) Viewport->ChangeZoom(1.0f/C4GFX_ZoomStep);
	}
	// Ctrl + Wheel: pass to player control (might be used for inventory or such)
	else
	{
		// TODO
		//if(iDelta > 0) Game.LocalPlayerControl(Player, COM_WheelUp);
		//if(iDelta < 0) Game.LocalPlayerControl(Player, COM_WheelDown);
	}
}

bool C4MouseControl::IsValidMenu(C4Menu *pMenu)
{
	// Local control fullscreen menu
	if (pMenu == FullScreen.pMenu)
		if (pMenu->IsActive())
			return true;
	// Local control player menu
	C4Player *pPlr;
	for (int32_t cnt=0; (pPlr=::Players.Get(cnt)); cnt++)
		if (pMenu == &(pPlr->Menu))
			if (pMenu->IsActive())
				return true;
	// No match found
	return false;
}

bool C4MouseControl::SendControl(int32_t iCom, int32_t iData)
{
	// Help
	if (iCom==COM_Help)
	{
		Help=true;
		return true;
	}
	// Activate player menu / fullscreen main menu (local control)
	if (iCom==COM_PlayerMenu)
	{
		if (IsPassive() && FullScreen.Active)
			FullScreen.ActivateMenuMain();
		else
			pPlayer->ActivateMenuMain();
		return true;
	}
	// Open chat
	if (iCom==COM_Chat)
	{
		C4ChatDlg::ShowChat();
		return true;
	}
	// other controls not valid in passive mode
	if (IsPassive()) return false;
	// Player control queue
	Game.Input.Add(CID_PlrControl, new C4ControlPlayerControl(Player,iCom,iData));
	// Done
	return true;
}

void C4MouseControl::DragConstruct()
{
	Cursor=C4MC_Cursor_Construct;

	// TODO: Re-enable something like this:
#if 0
	// Check site
	DragImagePhase=1;
	if (!FogOfWar && ConstructionCheck(C4Id2Def(DragID),int32_t(GameX),int32_t(GameY))) DragImagePhase=0;
#endif
}

void C4MouseControl::DragScript()
{
	// script drag should update target and selection so selection highlight on drop target is visible
	// Cursor movement
	UpdateCursorTarget();
	// Update selection
	UpdateSingleSelection();
	Cursor=C4MC_Cursor_DragDrop;
}

void C4MouseControl::LeftUpDragNone()
{
	// might be in Drag_Unknown
	Drag = C4MC_Drag_None;
	// Single left click (might be on a target)
	switch (Cursor)
	{
		// Region
	case C4MC_Cursor_Region:
		// Help click on region: ignore
		if (Help) break;
		// Region com & data
		SendControl(DownRegion.Com,DownRegion.Data);
		break;
		// Selection
	case C4MC_Cursor_Select:
		// Object selection to control queue
		if (!IsPassive()) Game.Input.Add(CID_PlrSelect, new C4ControlPlayerSelect(Player,Selection,false));
		break;
		// Help
	case C4MC_Cursor_Help:
		if (DownTarget)
		{
			//if (DownTarget->Def->GetDesc())
			//	Caption.Format("%s: %s",DownTarget->GetName(), DownTarget->Def->GetDesc());
			//else
				Caption.Copy(DownTarget->GetName());
			KeepCaption=Caption.getLength()/2;
			IsHelpCaption = true;
		}
		break;
		// Nothing
	case C4MC_Cursor_Nothing:
		break;
		// Movement?
	default:
		// done in script
		break;
	}
	// Clear selection
	Selection.Clear();
}

void C4MouseControl::ButtonUpDragSelecting()
{
	// Finish drag
	Drag=C4MC_Drag_None;
}

void C4MouseControl::ButtonUpDragMoving()
{
	// Finish drag
	Drag=C4MC_Drag_None;
	// Clear selection
	Selection.Clear();
}

void C4MouseControl::ButtonUpDragConstruct()
{
	// Finish drag
	Drag=C4MC_Drag_None;
	DragImageObject = NULL;
	DragImageDef = NULL;
	// Command
	// FIXME: Lots and lots of dead code in this file.
	//if (DragImagePhase==0) // if ConstructionCheck was okay (check again?)
		//SendCommand(C4CMD_Construct,int32_t(GameX),int32_t(GameY),NULL,NULL,DragID.GetHandle());
	// Clear selection (necessary?)
	Selection.Clear();
}

void C4MouseControl::ButtonUpDragScript()
{
	// Determine drag+drop targets
	UpdateCursorTarget();
	// Finish drag
	Drag=C4MC_Drag_None;
	DragID=C4ID::None;
	DragImageObject = NULL;
	DragImageDef = NULL;
	C4Object *DragObject = this->DragObject;
	this->DragObject = NULL;
	C4Object *DropObject = TargetObject;
	// drag object must exist; drop object is optional
	if (!DragObject) return;
	if (DropObject && (~DropObject->GetPropertyInt(P_MouseDrag) & C4MC_MD_DropTarget))
		DropObject = NULL;
	// no commands if player is eliminated or doesn't exist any more
	C4Player *pPlr = ::Players.Get(Player);
	if (!pPlr || pPlr->Eliminated) return;
	// todo: Perform drag/drop validity check
	// now drag/drop is handled by script
	if (DropObject)
		Game.Input.Add(CID_Script, new C4ControlScript(
		                 FormatString("%s(%d,Object(%d),Object(%d))", PSF_MouseDragDrop, (int)Player, (int)(DragObject->Number), (int)(DropObject->Number)).getData()));
	else
		Game.Input.Add(CID_Script, new C4ControlScript(
		                 FormatString("%s(%d,Object(%d),nil)", PSF_MouseDragDrop, (int)Player, (int)(DragObject->Number)).getData()));
}

void C4MouseControl::SendCommand(int32_t iCommand, int32_t iX, int32_t iY, C4Object *pTarget, C4Object *pTarget2, int32_t iData, int32_t iAddMode)
{
	// no commands in passive mode
	if (IsPassive()) return;
	// no commands if player is eliminated or doesn't exist any more
	C4Player *pPlr = ::Players.Get(Player);
	if (!pPlr || pPlr->Eliminated) return;
	// User add multiple command mode
	if (ShiftDown) iAddMode|=C4P_Command_Append;
	// Command to control queue
	Game.Input.Add(CID_PlrCommand, new C4ControlPlayerCommand(Player,iCommand,iX,iY,pTarget,pTarget2,iData,iAddMode));
}

void C4MouseControl::RightUpDragNone()
{

	// might be in Drag_Unknown
	Drag = C4MC_Drag_None;

	// Region: send control
	if (Cursor==C4MC_Cursor_Region)
		{ SendControl(DownRegion.RightCom); return; }

	// Alternative object selection
	if (Cursor==C4MC_Cursor_Select && !IsPassive())
		{ Game.Input.Add(CID_PlrSelect, new C4ControlPlayerSelect(Player,Selection,true)); }

	// Help: end
	if (Help)
		{ Help=false; KeepCaption=0; return; }

	// TODO: Evaluate right click

}

void C4MouseControl::UpdateFogOfWar()
{
	// Assume no fog of war
	FogOfWar=false;
	// Check for fog of war
	if ((pPlayer->fFogOfWar && !pPlayer->FoWIsVisible(int32_t(GameX),int32_t(GameY))) || GameX<0 || GameY<0 || int32_t(GameX)>=GBackWdt || int32_t(GameY)>=GBackHgt)
	{
		FogOfWar=true;
		// allow dragging, scrolling, region selection and manipulations of objects not affected by FoW
		if (!TargetRegion && !Scrolling && (!TargetObject || !(TargetObject->Category & C4D_IgnoreFoW)))
		{
			Cursor=C4MC_Cursor_Nothing;
			ShowPointX=ShowPointY=-1;
			// dragging will reset the cursor
		}
	}
}

void C4MouseControl::ShowCursor()
{
	Visible=true;
}

void C4MouseControl::HideCursor()
{
	Visible=false;
}

const char *C4MouseControl::GetCaption()
{
	return Caption.getData();
}

C4Object *C4MouseControl::GetTargetObject()
{
	// find object
	// gui object position currently wrong...will fall apart once GUIZoom is activated
	C4Object *pObj = Game.FindVisObject(ViewX, ViewY, Player, fctViewportGame, fctViewportGUI, GameX,GameY, Help ? C4D_All : C4D_MouseSelect, GuiX-fctViewportGUI.X, GuiY-fctViewportGUI.Y);
	if (!pObj) return NULL;
	return pObj;
}

bool C4MouseControl::IsPassive()
{
	return ::Control.isReplay() || Player<=NO_OWNER;
}

void C4MouseControl::ScrollView(float iX, float iY, float ViewWdt, float ViewHgt)
{
	// player assigned: scroll player view
	if (pPlayer)
		pPlayer->ScrollView(iX, iY, ViewWdt, ViewHgt);
	else if (Viewport)
	{
		// no player: Scroll fullscreen viewport
		Viewport->ViewX = Viewport->ViewX+iX;
		Viewport->ViewY = Viewport->ViewY+iY;
		Viewport->UpdateViewPosition();
	}

}

bool C4MouseControl::IsDragging()
{
	// no selection drag; return true for object drag only
	return Active && (Drag == C4MC_Drag_Moving || Drag == C4MC_Drag_Construct || Drag == C4MC_Drag_Script);
}

void C4MouseControl::StartConstructionDrag(C4ID id)
{
	Drag=C4MC_Drag_Construct;
	DragID=id;
	DragImageDef = C4Id2Def(id);
	Selection.Clear();
}

bool C4MouseControl::GetLastGUIPos(int32_t *x_out, int32_t *y_out) const
{
	// safety
	if (!Active || !fMouseOwned) return false;
	// OK; assign last known pos
	*x_out = GuiX; *y_out = GuiY;
	return true;
}