/*

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

Copyright (C) 2012-24 Miranda NG team (https://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 "stdafx.h"
#include "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))
	{
		memcpy(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;

	memset(&abd, 0, 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, 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)
		g_plugin.setByte("Docked", (uint8_t)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 (g_plugin.getByte("Docked", 0) && db_get_b(0, "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)g_plugin.getByte("Docked", 0);
		if (IsWindowVisible(msg->hwnd) && !IsIconic(msg->hwnd)) {
			RECT rc, rcMonitor;
			memset(&abd, 0, 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, nullptr);
		}
		break;
	case WM_CAPTURECHANGED:
		ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, nullptr);
		return 0;
	case WM_ACTIVATE:
		memset(&abd, 0, 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, nullptr);
		return 0;

	case WM_WINDOWPOSCHANGED:
	{
		if (g_CluiData.fDocked)
			ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, nullptr);
		return 0;
	}
	case WM_MOVING:
	{
		RECT rcMonitor;
		RECT rcWindow;
		RECT *rc;
		int dx = 0;
		POINT ptCursor;
		if (g_CluiData.fDocked) return 0;

		// 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(0, "CLUI", "DockToSides", SETTING_DOCKTOSIDES_DEFAULT))
		{
			memset(&abd, 0, 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);
			g_plugin.setByte("Docked", (uint8_t)g_CluiData.fDocked);
			ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, nullptr);
			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, nullptr, 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, nullptr);// -= -=  -=
		g_CluiData.mutexPreventDockMoving = 1;
		return 1;
	}

	case WM_MOVE:
	{
		ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_ALT_DRAW, nullptr);
		return 0;
	}
	case WM_SIZING:
	{
		if (g_CluiData.fDocked) ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, nullptr);
		return FALSE;
	}
	case WM_SHOWWINDOW:
	{
		if (msg->lParam)
			return 0;
		if ((msg->wParam && g_CluiData.fDocked < 0) || (!msg->wParam && g_CluiData.fDocked>0))
			g_CluiData.fDocked = -g_CluiData.fDocked;
		memset(&abd, 0, 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, nullptr);// -= -=  -=
		}
		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;
			memset(&abd, 0, 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, nullptr, pt.x - rc.right / 2, pt.y - GetSystemMetrics(SM_CYFRAME) - GetSystemMetrics(SM_CYSMCAPTION) / 2, g_plugin.getDword("Width", 0), g_plugin.getDword("Height", 0), SWP_NOZORDER);
			g_plugin.setByte("Docked", (uint8_t)g_CluiData.fDocked);
			// ModernSkinButton_ReposButtons(msg->hwnd, SBRF_DO_NOT_DRAW, nullptr);
		}
		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, nullptr);

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