//
// KeyboardMoveResizeEventHandler.hh for pekwm
// Copyright (C) 2021 Claes Nästén <pekdon@gmail.com>
//
// This program is licensed under the GNU GPL.
// See the LICENSE file for more information.
//

#include "Debug.hh"
#include "KeyboardMoveResizeEventHandler.hh"
#include "PDecor.hh"

KeyboardMoveResizeEventHandler::KeyboardMoveResizeEventHandler(Config* cfg,
							       KeyGrabber *kg,
							       PDecor* decor)
	: _key_grabber(kg),
	  _outline(! cfg->getOpaqueMove() || ! cfg->getOpaqueResize()),
	  _show_status_window(cfg->isShowStatusWindow()),
	  _center_on_root(cfg->isShowStatusWindowOnRoot()),
	  _init(false),
	  _decor(decor)
{
	decor->getGeometry(_gm);
	decor->getGeometry(_old_gm);
	_decor_shaded = decor->isShaded() ? _gm.height : 0;
	pekwm::observerMapping()->addObserver(decor, this);
}

KeyboardMoveResizeEventHandler::~KeyboardMoveResizeEventHandler(void)
{
	if (_decor) {
		pekwm::observerMapping()->removeObserver(_decor, this);
	}
	stopMoveResize();
}

void
KeyboardMoveResizeEventHandler::notify(Observable *observable,
				       Observation *observation)
{
	if (observation == &PWinObj::pwin_obj_deleted
	    && observable == _decor) {
		P_TRACE("decor" << _decor
			<< " lost while keyboard move/resize");
		_decor = nullptr;
	}
}

bool
KeyboardMoveResizeEventHandler::initEventHandler(void)
{
	if (! X11::grabPointer(X11::getRoot(), NoEventMask, CURSOR_MOVE)) {
		return false;
	}
	if (! X11::grabKeyboard(X11::getRoot())) {
		X11::ungrabPointer();
		return false;
	}

	if (_outline) {
		X11::grabServer();
		drawOutline(); // draw for initial clear
	}
	updateStatusWindow(true);

	_init = true;
	return true;
}

EventHandler::Result
KeyboardMoveResizeEventHandler::handleButtonPressEvent(XButtonEvent*)
{
	// mark as processed disabling wm processing of these events.
	return EventHandler::EVENT_PROCESSED;
}

EventHandler::Result
KeyboardMoveResizeEventHandler::handleButtonReleaseEvent(XButtonEvent*)
{
	// mark as processed disabling wm processing of these events.
	return EventHandler::EVENT_PROCESSED;
}

EventHandler::Result
KeyboardMoveResizeEventHandler::handleExposeEvent(XExposeEvent*)
{
	return EventHandler::EVENT_SKIP;
}

EventHandler::Result
KeyboardMoveResizeEventHandler::handleMotionNotifyEvent(XMotionEvent*)
{
	// mark as processed disabling wm processing of these events.
	return EventHandler::EVENT_PROCESSED;
}

EventHandler::Result
KeyboardMoveResizeEventHandler::handleKeyEvent(XKeyEvent *ev)
{
	if (! _decor) {
		return stopMoveResize();
	} else if (ev->type == KeyRelease) {
		return EventHandler::EVENT_PROCESSED;
	}

	EventHandler::Result res = EventHandler::EVENT_PROCESSED;
	ActionEvent *ae = _key_grabber->findMoveResizeAction(ev);
	if (ae == nullptr) {
		return res;
	}

	drawOutline(); // clear previous draw

	ActionEvent::it it = ae->action_list.begin();
	for (; it != ae->action_list.end(); ++it) {
		res = runMoveResizeAction(*it);
		if (res == EventHandler::EVENT_STOP_PROCESSED) {
			break;
		}
	}

	drawOutline();
	updateStatusWindow(false);

	if (res == EventHandler::EVENT_STOP_PROCESSED
	    || res == EventHandler::EVENT_STOP_SKIP) {
		stopMoveResize();
	}

	return res;
}

EventHandler::Result
KeyboardMoveResizeEventHandler::runMoveResizeAction(const Action& action)
{
	int gm_mask = 0;

	switch (action.getAction()) {
	case MOVE_HORIZONTAL:
		if (action.getParamI(1) == UNIT_PERCENT) {
			Geometry head;
			uint nhead = X11Util::getNearestHead(*_decor);
			X11::getHeadInfo(nhead, head);
			_gm.x += (action.getParamI(0)
				  * static_cast<int>(head.width)) / 100;
		} else {
			_gm.x += action.getParamI(0);
		}
		gm_mask = X_VALUE;
		break;
	case MOVE_VERTICAL:
		if (action.getParamI(1) == UNIT_PERCENT) {
			Geometry head;
			uint nhead = X11Util::getNearestHead(*_decor);
			X11::getHeadInfo(nhead, head);
			_gm.y += (action.getParamI(0)
				  * static_cast<int>(head.height)) / 100;
		} else {
			_gm.y +=  action.getParamI(0);
		}
		gm_mask = Y_VALUE;
		break;
	case RESIZE_HORIZONTAL:
		if (action.getParamI(1) == UNIT_PERCENT) {
			Geometry head;
			uint nhead = X11Util::getNearestHead(*_decor);
			X11::getHeadInfo(nhead, head);
			_gm.width += (action.getParamI(0)
				      * static_cast<int>(head.width)) / 100;
		} else {
			_gm.width +=  action.getParamI(0);
		}
		gm_mask = WIDTH_VALUE;
		break;
	case RESIZE_VERTICAL:
		if (action.getParamI(1) == UNIT_PERCENT) {
			Geometry head;
			uint nhead = X11Util::getNearestHead(*_decor);
			X11::getHeadInfo(nhead, head);
			_gm.height += (action.getParamI(0)
				       * static_cast<int>(head.height)) / 100;
		} else {
			_gm.height +=  action.getParamI(0);
		}
		gm_mask = HEIGHT_VALUE;
		break;
	case MOVE_SNAP:
		PDecor::checkSnap(_decor, _gm);
		gm_mask = X_VALUE | Y_VALUE;
		break;
	case MOVE_CANCEL:
		gm_mask = _old_gm.diffMask(_gm);
		_gm = _old_gm; // restore position

		if (! _outline) {
			_decor->moveResize(_old_gm, gm_mask);
		}

		return EventHandler::EVENT_STOP_PROCESSED;
	case MOVE_END:
		if (_outline) {
			gm_mask = _gm.diffMask(_old_gm);
			_decor->moveResize(_gm, gm_mask);
		}
		return EventHandler::EVENT_STOP_PROCESSED;
	default:
		break;
	}

	if (! _outline) {
		_decor->moveResize(_gm, gm_mask);
	}
	return EventHandler::EVENT_PROCESSED;
}

void
KeyboardMoveResizeEventHandler::drawOutline(void)
{
	if (_outline) {
		PDecor::drawOutline(_gm, _decor_shaded);
	}
}

void
KeyboardMoveResizeEventHandler::updateStatusWindow(bool map)
{
	if (_show_status_window) {
		char buf[128];
		_decor->getDecorInfo(buf, 128, _gm);

		StatusWindow *sw = pekwm::statusWindow();
		if (map) {
			// draw before map to avoid resize right after the
			// window is mapped.
			sw->draw(buf, true, _center_on_root ? 0 : &_gm);
			sw->mapWindowRaised();
		}
		sw->draw(buf, true, _center_on_root ? 0 : &_gm);
	}
}

EventHandler::Result
KeyboardMoveResizeEventHandler::stopMoveResize(void)
{
	if (_init) {
		if (_show_status_window) {
			pekwm::statusWindow()->unmapWindow();
		}
		if (_outline) {
			drawOutline();
			X11::ungrabServer(true);
		}
		X11::ungrabPointer();
		X11::ungrabKeyboard();
		_init = false;
	}
	return EventHandler::EVENT_STOP_SKIP;
}
