/*

Miranda NG: the free IM client for Microsoft* Windows*

Copyright (c) 2012-14 Miranda NG project (http://miranda-ng.org),
Copyright (c) 2000-08 Miranda ICQ/IM project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include "hdr/modern_commonheaders.h"
#include "hdr/modern_clist.h"
#include "m_api/m_skin_eng.h"
#include "m_api/m_skinbutton.h"
#include "hdr/modern_commonprototypes.h"
#include "hdr/modern_sync.h"

#define WM_DOCKCALLBACK   (WM_USER+121)
#define WM_CREATEDOCKED   (WM_USER+122)
#define EDGESENSITIVITY   3

#define DOCKED_NONE    0
#define DOCKED_LEFT    1
#define DOCKED_RIGHT   2

BOOL LockSubframeMoving = 0;
static int TempDock = 0;
static int dock_drag_dx = 0;
static int dock_drag_dy = 0;

static void Docking_GetMonitorRectFromPoint(POINT pt,RECT *rc)
{
	MONITORINFO monitorInfo;
	HMONITOR hMonitor = MonitorFromPoint(pt,MONITOR_DEFAULTTONEAREST); // always returns a valid value
	monitorInfo.cbSize = sizeof(MONITORINFO);

	if (GetMonitorInfo(hMonitor, &monitorInfo))
	{
		CopyMemory(rc,&monitorInfo.rcMonitor,sizeof(RECT));
		return;
	}

	// "generic" win95/NT support, also serves as failsafe
	rc->left = 0;
	rc->top = 0;
	rc->bottom = GetSystemMetrics(SM_CYSCREEN);
	rc->right = GetSystemMetrics(SM_CXSCREEN);
}

void Docking_GetMonitorRectFromWindow(HWND hWnd,RECT *rc)
{
	POINT ptWindow;
	GetWindowRect(hWnd,rc);
	ptWindow.x = rc->left;
	ptWindow.y = rc->top;
	Docking_GetMonitorRectFromPoint(ptWindow,rc);
}

static void Docking_AdjustPosition(HWND hwnd,RECT *rcDisplay,RECT *rc)
{
	APPBARDATA abd;

	ZeroMemory(&abd,sizeof(abd));
	abd.cbSize = sizeof(abd);
	abd.hWnd = hwnd;
	abd.uEdge = g_CluiData.fDocked == DOCKED_LEFT?ABE_LEFT:ABE_RIGHT;
	abd.rc = *rc;
	abd.rc.top = rcDisplay->top;
	abd.rc.bottom = rcDisplay->bottom;
	if (g_CluiData.fDocked == DOCKED_LEFT) {
		abd.rc.right = rcDisplay->left+abd.rc.right-abd.rc.left;
		abd.rc.left = rcDisplay->left;
	}
	else {
		abd.rc.left = rcDisplay->right-(abd.rc.right-abd.rc.left);
		abd.rc.right = rcDisplay->right;

	}
	SHAppBarMessage(ABM_SETPOS,&abd);
	*rc = abd.rc;
}

int Docking_IsDocked(WPARAM wParam,LPARAM lParam)
{
	return g_CluiData.fDocked;
}

int Docking_ProcessWindowMessage(WPARAM wParam,LPARAM lParam)
{
	APPBARDATA abd;
	static int draggingTitle;
	MSG *msg = (MSG*)wParam;

	if (msg->message == WM_DESTROY)
		db_set_b(NULL,"CList","Docked",(BYTE)g_CluiData.fDocked);

	if (!g_CluiData.fDocked && msg->message != WM_CREATE && msg->message != WM_MOVING && msg->message != WM_CREATEDOCKED && msg->message != WM_MOVE && msg->message != WM_SIZE) return 0;
	switch(msg->message) {
		case WM_CREATE:
			//if (GetSystemMetrics(SM_CMONITORS)>1) return 0;
			if ( db_get_b(NULL,"CList","Docked",0) && db_get_b(NULL,"CLUI","DockToSides",SETTING_DOCKTOSIDES_DEFAULT))
			{
				PostMessage(msg->hwnd,WM_CREATEDOCKED, 0, 0);
			}
			draggingTitle = 0;
			return 0;

		case WM_CREATEDOCKED:
			//we need to post a message just after creation to let main message function do some work
			g_CluiData.fDocked = (BOOL)db_get_b(NULL,"CList","Docked",0);
			if (IsWindowVisible(msg->hwnd) && !IsIconic(msg->hwnd)) {
				RECT rc, rcMonitor;
				ZeroMemory(&abd,sizeof(abd));
				abd.cbSize = sizeof(abd);
				abd.hWnd = msg->hwnd;
				abd.lParam = 0;
				abd.uCallbackMessage = WM_DOCKCALLBACK;
				SHAppBarMessage(ABM_NEW,&abd);
				GetWindowRect(msg->hwnd,&rc);
				Docking_GetMonitorRectFromWindow(msg->hwnd,&rcMonitor);
				Docking_AdjustPosition(msg->hwnd,&rcMonitor,&rc);
				MoveWindow(msg->hwnd,rc.left,rc.top,rc.right-rc.left,rc.bottom-rc.top,TRUE);
				g_CluiData.mutexPreventDockMoving = 0;
				Sync(CLUIFrames_OnMoving,msg->hwnd,&rc);
				g_CluiData.mutexPreventDockMoving = 1;
				ModernSkinButton_ReposButtons( msg->hwnd, SBRF_DO_NOT_DRAW, NULL );
			}
			break;
		case WM_CAPTURECHANGED:
			ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW,NULL);
			return 0;
		case WM_ACTIVATE:
			ZeroMemory(&abd,sizeof(abd));
			abd.cbSize = sizeof(abd);
			abd.hWnd = msg->hwnd;
			SHAppBarMessage(ABM_ACTIVATE,&abd);
			return 0;
		case WM_SIZE:
			ModernSkinButton_ReposButtons( msg->hwnd, SBRF_DO_REDRAW_ALL, NULL );
			return 0;

		case WM_WINDOWPOSCHANGED:
			{
				if (g_CluiData.fDocked) ModernSkinButton_ReposButtons( msg->hwnd,SBRF_DO_NOT_DRAW, NULL );
				return 0;
				ZeroMemory(&abd,sizeof(abd));
				abd.cbSize = sizeof(abd);
				abd.hWnd = msg->hwnd;
				SHAppBarMessage(ABM_WINDOWPOSCHANGED,&abd);
				ModernSkinButton_ReposButtons( msg->hwnd, SBRF_DO_NOT_DRAW, NULL );
				return 0;
			}
		case WM_MOVING:
			{
				RECT rcMonitor;
				RECT rcWindow;
				RECT *rc;
				int dx = 0;
				POINT ptCursor;
				if (g_CluiData.fDocked) return 0;
				// stop early
				BOOL bControlled = (BOOL)(GetAsyncKeyState(VK_CONTROL)&0x8000);

				// GetMessagePos() is no good, position is always unsigned
				GetCursorPos(&ptCursor);
				GetWindowRect(msg->hwnd,&rcWindow);
				dock_drag_dx = rcWindow.left-ptCursor.x;
				dock_drag_dy = rcWindow.top-ptCursor.y;
				Docking_GetMonitorRectFromPoint(ptCursor,&rcMonitor);

				if (((ptCursor.x < rcMonitor.left+EDGESENSITIVITY)
					 ||  (ptCursor.x >= rcMonitor.right-EDGESENSITIVITY))
					 &&  db_get_b(NULL,"CLUI","DockToSides",SETTING_DOCKTOSIDES_DEFAULT))
				{
					ZeroMemory(&abd,sizeof(abd));
					abd.cbSize = sizeof(abd);
					abd.hWnd = msg->hwnd;
					abd.lParam = 0;
					abd.uCallbackMessage = WM_DOCKCALLBACK;
					SHAppBarMessage(ABM_NEW,&abd);
					if (ptCursor.x < rcMonitor.left+EDGESENSITIVITY) g_CluiData.fDocked = DOCKED_LEFT;
					else g_CluiData.fDocked = DOCKED_RIGHT;
					//	TempDock = 1;
					GetWindowRect(msg->hwnd,(LPRECT)msg->lParam);
					rc = (RECT*)msg->lParam;
					if (g_CluiData.fDocked == DOCKED_RIGHT)
						dx = (rc->right>rcMonitor.right)?rc->right-rcMonitor.right:0;
					else
						dx = (rc->left < rcMonitor.left)?rc->left-rcMonitor.left:0;
					OffsetRect(rc,-dx,0);
					Docking_AdjustPosition(msg->hwnd,(LPRECT)&rcMonitor,(LPRECT)msg->lParam);
					SendMessage(msg->hwnd,WM_SIZE, 0, 0);
					g_CluiData.mutexPreventDockMoving = 0;
					Sync(CLUIFrames_OnMoving,msg->hwnd,(LPRECT)msg->lParam);
					g_CluiData.mutexPreventDockMoving = 1;
					mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);
					db_set_b(NULL,"CList","Docked",(BYTE)g_CluiData.fDocked);
					ModernSkinButton_ReposButtons( msg->hwnd, SBRF_DO_NOT_DRAW, NULL );
					return TRUE;
				}
				return 0;
			}
		case WM_EXITSIZEMOVE:
			{
				RECT rcMonitor;
				RECT rcWindow;
				if (TempDock) TempDock = 0;
				GetWindowRect(msg->hwnd,&rcWindow);
				Docking_GetMonitorRectFromWindow(msg->hwnd,&rcMonitor);
				Docking_AdjustPosition(msg->hwnd,&rcMonitor,&rcWindow);
				*((LRESULT*)lParam) = TRUE;
				g_CluiData.mutexPreventDockMoving = 0;
				SetWindowPos(msg->hwnd, 0, rcWindow.left,rcWindow.top, 0, 0, SWP_NOSIZE|SWP_NOZORDER|SWP_NOREDRAW|SWP_NOSENDCHANGING);
				Sync(CLUIFrames_OnMoving,msg->hwnd,&rcWindow);
				ModernSkinButton_ReposButtons( msg->hwnd, SBRF_DO_NOT_DRAW, NULL );// -= -=  -=
				g_CluiData.mutexPreventDockMoving = 1;
				return 1;
			}

		case WM_MOVE:
			{
				ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_ALT_DRAW, NULL);
				return 0;
			}
		case WM_SIZING:
			{

				/*RECT rcMonitor;
				Docking_GetMonitorRectFromWindow(msg->hwnd,&rcMonitor);
				Docking_AdjustPosition(msg->hwnd,&rcMonitor,(LPRECT)msg->lParam);
				*((LRESULT*)lParam) = TRUE;
				*/
				RECT rc;
				if (g_CluiData.fDocked) ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW,NULL);
				return FALSE;
				rc = *(RECT*)(msg->lParam);
				g_CluiData.mutexPreventDockMoving = 0;
				Sync(CLUIFrames_OnMoving,msg->hwnd,&rc);
				// -= -=  -=
				return TRUE;
			}
		case WM_SHOWWINDOW:
			{
				if (msg->lParam) return 0;
				BOOL toBeDocked = (BOOL)db_get_b(NULL,"CLUI","DockToSides",SETTING_DOCKTOSIDES_DEFAULT);
				if ((msg->wParam && g_CluiData.fDocked < 0) || (!msg->wParam && g_CluiData.fDocked>0)) g_CluiData.fDocked = -g_CluiData.fDocked;
				ZeroMemory(&abd,sizeof(abd));
				abd.cbSize = sizeof(abd);
				abd.hWnd = msg->hwnd;
				if (msg->wParam) {
					RECT rc, rcMonitor;
					Docking_GetMonitorRectFromWindow(msg->hwnd,&rcMonitor);
					abd.lParam = 0;
					abd.uCallbackMessage = WM_DOCKCALLBACK;
					SHAppBarMessage(ABM_NEW,&abd);
					GetWindowRect(msg->hwnd,&rc);
					Docking_AdjustPosition(msg->hwnd,&rcMonitor,&rc);
					MoveWindow(msg->hwnd,rc.left,rc.top,rc.right-rc.left,rc.bottom-rc.top,FALSE);
					Sync(CLUIFrames_OnMoving,msg->hwnd,&rc);
					ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW,NULL);// -= -=  -=
				}
				else {
					SHAppBarMessage(ABM_REMOVE,&abd);
				}
			}
			return 0;
		case WM_NCHITTEST:
			{	LONG result;
			result = DefWindowProc(msg->hwnd,WM_NCHITTEST,msg->wParam,msg->lParam);
			if (result == HTSIZE || result == HTTOP || result == HTTOPLEFT || result == HTTOPRIGHT  ||
				result == HTBOTTOM || result == HTBOTTOMRIGHT || result == HTBOTTOMLEFT) {*((LRESULT*)lParam) = HTCLIENT; return TRUE;}
				if (g_CluiData.fDocked == DOCKED_LEFT && result == HTLEFT) {*((LRESULT*)lParam) = HTCLIENT; return TRUE;}
				if (g_CluiData.fDocked == DOCKED_RIGHT && result == HTRIGHT) {*((LRESULT*)lParam) = HTCLIENT; return TRUE;}


				return 0;
			}
		case WM_SYSCOMMAND:
			if ((msg->wParam&0xFFF0) != SC_MOVE) return 0;
			SetActiveWindow(msg->hwnd);
			SetCapture(msg->hwnd);
			draggingTitle = 1;
			*((LRESULT*)lParam) = 0;
			return TRUE;
		case WM_MOUSEMOVE:

			if (!draggingTitle) return 0;
			{	RECT rc;
			POINT pt;
			GetClientRect(msg->hwnd,&rc);
			if (((g_CluiData.fDocked == DOCKED_LEFT || g_CluiData.fDocked == -DOCKED_LEFT) && (short)LOWORD(msg->lParam)>rc.right)  ||
				((g_CluiData.fDocked == DOCKED_RIGHT || g_CluiData.fDocked == -DOCKED_RIGHT) && (short)LOWORD(msg->lParam) < 0)) {
					ReleaseCapture();
					draggingTitle = 0;
					ZeroMemory(&abd,sizeof(abd));
					abd.cbSize = sizeof(abd);
					abd.hWnd = msg->hwnd;
					SHAppBarMessage(ABM_REMOVE,&abd);
					g_CluiData.fDocked = 0;
					GetCursorPos(&pt);
					PostMessage(msg->hwnd,WM_NCLBUTTONDOWN,HTCAPTION,MAKELPARAM(pt.x,pt.y));
					SetWindowPos(msg->hwnd, 0, pt.x-rc.right/2,pt.y-GetSystemMetrics(SM_CYFRAME)-GetSystemMetrics(SM_CYSMCAPTION)/2,db_get_dw(NULL,"CList","Width",0),db_get_dw(NULL,"CList","Height",0),SWP_NOZORDER);
					db_set_b(NULL,"CList","Docked",(BYTE)g_CluiData.fDocked);
					// ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, NULL);
				}
				return 1;
			}
		case WM_LBUTTONUP:
			if (draggingTitle) {
				ReleaseCapture();
				draggingTitle = 0;
			}
			return 0;
		case WM_DOCKCALLBACK:
			switch(msg->wParam) {
		case ABN_WINDOWARRANGE:
			CLUI_ShowWindowMod(msg->hwnd,msg->lParam?SW_HIDE:SW_SHOW);
			{

				RECT rc, rcMonitor;
				Docking_GetMonitorRectFromWindow(msg->hwnd,&rcMonitor);
				GetWindowRect(msg->hwnd,&rc);
				Docking_AdjustPosition(msg->hwnd,&rcMonitor,&rc);
				Sync(CLUIFrames_OnMoving,msg->hwnd,&rc); // -= -=  -=
				ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, NULL);

				g_CluiData.mutexPreventDockMoving = 1;
			}
			break;
			}
			return TRUE;
		case WM_DESTROY:
			if (g_CluiData.fDocked>0) {
				ZeroMemory(&abd,sizeof(abd));
				abd.cbSize = sizeof(abd);
				abd.hWnd = msg->hwnd;
				SHAppBarMessage(ABM_REMOVE,&abd);
				ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, NULL);
			}
			return 0;
	}
	return 0;
}