/*

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

Copyright (c) 2012-14 Miranda NG project (http://miranda-ng.org),
Copyright (c) 2000-03 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 "commonheaders.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
static int docked;

extern RECT cluiPos;

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);
}

static 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 = docked == DOCKED_LEFT ? ABE_LEFT : ABE_RIGHT;
    abd.rc = *rc;
    abd.rc.top = rcDisplay->top;
    abd.rc.bottom = rcDisplay->bottom;
    if (docked == DOCKED_LEFT) {
        abd.rc.right = rcDisplay->left + (abd.rc.right - abd.rc.left) - cfg::dat.bClipBorder;
        abd.rc.left = rcDisplay->left - cfg::dat.bClipBorder;
    } else {
        abd.rc.left = rcDisplay->right - (abd.rc.right - abd.rc.left) + cfg::dat.bClipBorder;
        abd.rc.right = rcDisplay->right + cfg::dat.bClipBorder;
    }
    SHAppBarMessage(ABM_SETPOS, &abd);
    *rc = abd.rc;
}

int Docking_IsDocked(WPARAM wParam, LPARAM lParam)
{
    return docked;
}

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

    if (msg->message == WM_DESTROY)
        cfg::writeByte("CList", "Docked", (BYTE) docked);
    if ( !docked && msg->message != WM_CREATE && msg->message != WM_MOVING && msg->message != WM_CREATEDOCKED && msg->message != WM_MOVE)
        return 0;
    switch (msg->message) {
        case WM_CREATE:
    //if (GetSystemMetrics(SM_CMONITORS)>1) return 0;
            if (cfg::getByte("CList", "Docked", 0))
                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
            docked = (int) (char) cfg::getByte("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);
            }
            break;
        case WM_ACTIVATE:
            ZeroMemory(&abd, sizeof(abd));
            abd.cbSize = sizeof(abd);
            abd.hWnd = msg->hwnd;
            SHAppBarMessage(ABM_ACTIVATE, &abd);
            return 0;
        case WM_WINDOWPOSCHANGED:
            ZeroMemory(&abd, sizeof(abd));
            abd.cbSize = sizeof(abd);
            abd.hWnd = msg->hwnd;
            SHAppBarMessage(ABM_WINDOWPOSCHANGED, &abd);
            return 0;
        case WM_MOVING:
            {
                RECT rcMonitor;
                POINT ptCursor;

        // stop early
                if (GetAsyncKeyState(VK_CONTROL) & 0x8000)
                    return 0;

        // GetMessagePos() is no good, position is always unsigned
                GetCursorPos(&ptCursor);
                Docking_GetMonitorRectFromPoint(ptCursor, &rcMonitor);

                if ((ptCursor.x < rcMonitor.left + EDGESENSITIVITY) || (ptCursor.x >= rcMonitor.right - EDGESENSITIVITY)) {
					if ( !(GetWindowLongPtr(msg->hwnd, GWL_EXSTYLE) & WS_EX_TOOLWINDOW)) {
						SendMessage(msg->hwnd, CLUIINTM_REDRAW, 0, 0);
						MessageBox(0, TranslateT("The contact list cannot be docked when using the default title bar and border. Use a toolwindow or borderless style instead."),
								   TranslateT("Contact list docking"), MB_OK);
						return 0;
					}
					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)
                        docked = DOCKED_LEFT;
                    else
                        docked = DOCKED_RIGHT;
                    SendMessage(msg->hwnd, WM_LBUTTONUP, 0, MAKELPARAM(ptCursor.x, ptCursor.y));
                    GetWindowRect(msg->hwnd, (LPRECT) msg->lParam);
                    Docking_AdjustPosition(msg->hwnd, (LPRECT) &rcMonitor, (LPRECT) msg->lParam);
					PostMessage(msg->hwnd, CLUIINTM_REDRAW, 0, 0);
                    return TRUE;
                }
                return 0;
            }
        case WM_MOVE:
            {
                if (docked) {
                    RECT rc, rcMonitor;
                    Docking_GetMonitorRectFromWindow(msg->hwnd, &rcMonitor);
                    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, TRUE);
                    return 1;
                }
                return 0;
            }
        case WM_SIZING:
            {
                RECT rcMonitor;
                Docking_GetMonitorRectFromWindow(msg->hwnd, &rcMonitor);
                Docking_AdjustPosition(msg->hwnd, &rcMonitor, (LPRECT) msg->lParam);
                *((LRESULT *) lParam) = TRUE;
                return TRUE;
            }
        case WM_SHOWWINDOW:
            if (msg->lParam)
                return 0;
            if ((msg->wParam && docked < 0) || (!msg->wParam && docked > 0))
                docked = -docked;
            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);
            } 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 (docked == DOCKED_LEFT && result == HTLEFT) {
                    *((LRESULT *) lParam) = HTCLIENT; return TRUE;
                }
                if (docked == 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 (((docked == DOCKED_LEFT || docked == -DOCKED_LEFT) && (short) LOWORD(msg->lParam) > rc.right) || ((docked == DOCKED_RIGHT || docked == -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);
                    docked = 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, cluiPos.right, cluiPos.bottom, SWP_NOZORDER);
                }
                return 1;
            }
        case WM_LBUTTONUP:
            if (draggingTitle) {
                ReleaseCapture();
                draggingTitle = 0;
            }
            return 0;
        case WM_DOCKCALLBACK:
            switch (msg->wParam) {
                case ABN_WINDOWARRANGE:
                    ShowWindow(msg->hwnd, msg->lParam ? SW_HIDE : SW_SHOW);
                    break;
            }
            return TRUE;
        case WM_DESTROY:
            if (docked > 0) {
                ZeroMemory(&abd, sizeof(abd));
                abd.cbSize = sizeof(abd);
                abd.hWnd = msg->hwnd;
                SHAppBarMessage(ABM_REMOVE, &abd);
            }
            return 0;
    }
    return 0;
}