/*************************************************************************/
/*  split_container.cpp                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "split_container.h"

#include "margin_container.h"
#include "label.h"



struct _MinSizeCache {

	int min_size;
	bool will_stretch;
	int final_size;
};


Control *SplitContainer::_getch(int p_idx) const {

	int idx=0;

	for(int i=0;i<get_child_count();i++) {
		Control *c=get_child(i)->cast_to<Control>();
		if (!c || !c->is_visible_in_tree())
			continue;
		if (c->is_set_as_toplevel())
			continue;

		if (idx==p_idx)
			return c;

		idx++;
	}

	return NULL;

}


void SplitContainer::_resort() {

	/** First pass, determine minimum size AND amount of stretchable elements */

	int axis = vertical?1:0;

	bool has_first=_getch(0);
	bool has_second=_getch(1);

	if (!has_first && !has_second) {
		return;
	} else if (! (has_first && has_second)) {
		if (has_first)
			fit_child_in_rect(_getch(0),Rect2(Point2(),get_size()));
		else
			fit_child_in_rect(_getch(1),Rect2(Point2(),get_size()));

		return;
	}



	Control *first=_getch(0);
	Control *second=_getch(1);


	bool ratiomode=false;
	bool expand_first_mode=false;




	if (vertical) {

		ratiomode=first->get_v_size_flags()&SIZE_EXPAND && second->get_v_size_flags()&SIZE_EXPAND;
		expand_first_mode=first->get_v_size_flags()&SIZE_EXPAND && !(second->get_v_size_flags()&SIZE_EXPAND);
	} else {

		ratiomode=first->get_h_size_flags()&SIZE_EXPAND && second->get_h_size_flags()&SIZE_EXPAND;
		expand_first_mode=first->get_h_size_flags()&SIZE_EXPAND && !(second->get_h_size_flags()&SIZE_EXPAND);
	}


	int sep=get_constant("separation");
	Ref<Texture> g = get_icon("grabber");

	if (dragger_visibility==DRAGGER_HIDDEN_COLLAPSED) {
		sep=0;
	} else {
		sep=MAX(sep,vertical?g->get_height():g->get_width());
	}

	int total = vertical?get_size().height:get_size().width;

	total-=sep;

	int minimum=0;

	Size2 ms_first = first->get_combined_minimum_size();
	Size2 ms_second = second->get_combined_minimum_size();

	if (vertical) {

		minimum=ms_first.height+ms_second.height;
	} else {

		minimum=ms_first.width+ms_second.width;
	}

	int available=total-minimum;
	if (available<0)
		available=0;


	middle_sep=0;

	if (collapsed) {


		if (ratiomode) {

			middle_sep=ms_first[axis]+available/2;


		} else if (expand_first_mode) {

			middle_sep=get_size()[axis]-ms_second[axis]-sep;

		} else {

			middle_sep=ms_first[axis];
		}


	} else if (ratiomode) {

		if (expand_ofs<-(available/2))
			expand_ofs=-(available/2);
		else if (expand_ofs>(available/2))
			expand_ofs=(available/2);

		middle_sep=ms_first[axis]+available/2+expand_ofs;


	} else if (expand_first_mode) {

		if (expand_ofs>0)
			expand_ofs=0;

		if (expand_ofs < -available)
			expand_ofs=-available;

		middle_sep=get_size()[axis]-ms_second[axis]-sep+expand_ofs;

	} else {

		if (expand_ofs<0)
			expand_ofs=0;

		if (expand_ofs > available)
			expand_ofs=available;

		middle_sep=ms_first[axis]+expand_ofs;

	}



	if (vertical) {

		fit_child_in_rect(first,Rect2(Point2(0,0),Size2(get_size().width,middle_sep)));
		int sofs=middle_sep+sep;
		fit_child_in_rect(second,Rect2(Point2(0,sofs),Size2(get_size().width,get_size().height-sofs)));

	} else {


		fit_child_in_rect(first,Rect2(Point2(0,0),Size2(middle_sep,get_size().height)));
		int sofs=middle_sep+sep;
		fit_child_in_rect(second,Rect2(Point2(sofs,0),Size2(get_size().width-sofs,get_size().height)));
	}

	update();
	_change_notify("split/offset");

}




Size2 SplitContainer::get_minimum_size() const {


	/* Calculate MINIMUM SIZE */

	Size2i minimum;
	int sep=get_constant("separation");
	Ref<Texture> g = get_icon("grabber");
	sep=(dragger_visibility!=DRAGGER_HIDDEN_COLLAPSED)?MAX(sep,vertical?g->get_height():g->get_width()):0;

	for(int i=0;i<2;i++) {

		if (!_getch(i))
			break;

		if (i==1) {

			if (vertical)
				minimum.height+=sep;
			else
				minimum.width+=sep;
		}

		Size2 ms = _getch(i)->get_combined_minimum_size();

		if (vertical) {

			minimum.height+=ms.height;
			minimum.width=MAX(minimum.width,ms.width);
		} else {

			minimum.width+=ms.width;
			minimum.height=MAX(minimum.height,ms.height);
		}

	}

	return minimum;


}

void SplitContainer::_notification(int p_what) {

	switch(p_what) {

		case NOTIFICATION_SORT_CHILDREN: {

			_resort();
		} break;
		case NOTIFICATION_MOUSE_ENTER: {
			mouse_inside=true;
			update();
		} break;
		case NOTIFICATION_MOUSE_EXIT: {
			mouse_inside=false;
			update();
		} break;
		case NOTIFICATION_DRAW: {

			if (!_getch(0) || !_getch(1))
				return;

			if (collapsed || (!mouse_inside && get_constant("autohide")))
				return;
			int sep=dragger_visibility!=DRAGGER_HIDDEN_COLLAPSED?get_constant("separation"):0;
			Ref<Texture> tex = get_icon("grabber");
			Size2 size=get_size();
			if (vertical) {

				//draw_style_box( get_stylebox("bg"), Rect2(0,middle_sep,get_size().width,sep));
				if (dragger_visibility==DRAGGER_VISIBLE)
					draw_texture(tex,Point2i((size.x-tex->get_width())/2,middle_sep+(sep-tex->get_height())/2));

			} else {

				//draw_style_box( get_stylebox("bg"), Rect2(middle_sep,0,sep,get_size().height));
				if (dragger_visibility==DRAGGER_VISIBLE)
					draw_texture(tex,Point2i(middle_sep+(sep-tex->get_width())/2,(size.y-tex->get_height())/2));

			}

		} break;
	}
}

void SplitContainer::_gui_input(const InputEvent& p_event) {

	if (collapsed || !_getch(0) || !_getch(1) || dragger_visibility!=DRAGGER_VISIBLE)
		return;

	if (p_event.type==InputEvent::MOUSE_BUTTON) {

		const InputEventMouseButton &mb=p_event.mouse_button;

		if (mb.button_index==BUTTON_LEFT) {

			if (mb.pressed) {
				int sep=get_constant("separation");

				if (vertical) {


					if (mb.y > middle_sep && mb.y < middle_sep+sep) {
						dragging=true;
						drag_from=mb.y;
						drag_ofs=expand_ofs;
					}
				} else {

					if (mb.x > middle_sep && mb.x < middle_sep+sep) {
						dragging=true;
						drag_from=mb.x;
						drag_ofs=expand_ofs;
					}
				}
			} else {

				dragging=false;
			}

		}
	}

	if (p_event.type==InputEvent::MOUSE_MOTION) {

		const InputEventMouseMotion &mm=p_event.mouse_motion;

		if (dragging) {

			expand_ofs=drag_ofs+((vertical?mm.y:mm.x)-drag_from);
			queue_sort();
			emit_signal("dragged",get_split_offset());
		}
	}

}

Control::CursorShape SplitContainer::get_cursor_shape(const Point2& p_pos) const {

	if (collapsed)
		return Control::get_cursor_shape(p_pos);

	if (dragging)
		return (vertical?CURSOR_VSIZE:CURSOR_HSIZE);

	int sep=get_constant("separation");

	if (vertical) {


		if (p_pos.y > middle_sep && p_pos.y < middle_sep+sep) {
			return CURSOR_VSIZE;
		}
	} else {

		if (p_pos.x > middle_sep && p_pos.x < middle_sep+sep) {
			return CURSOR_HSIZE;
		}
	}

	return Control::get_cursor_shape(p_pos);

}

void SplitContainer::set_split_offset(int p_offset) {

	if (expand_ofs==p_offset)
		return;
	expand_ofs=p_offset;
	queue_sort();
}

int SplitContainer::get_split_offset() const {

	return expand_ofs;
}

void SplitContainer::set_collapsed(bool p_collapsed) {

	if (collapsed==p_collapsed)
		return;
	collapsed=p_collapsed;
	queue_sort();

}

void SplitContainer::set_dragger_visibility(DraggerVisibility p_visibility) {

	dragger_visibility=p_visibility;
	queue_sort();
	update();
}

SplitContainer::DraggerVisibility SplitContainer::get_dragger_visibility() const {

	return dragger_visibility;
}


bool SplitContainer::is_collapsed() const {


	return collapsed;
}


void SplitContainer::_bind_methods() {

	ClassDB::bind_method(_MD("_gui_input"),&SplitContainer::_gui_input);
	ClassDB::bind_method(_MD("set_split_offset","offset"),&SplitContainer::set_split_offset);
	ClassDB::bind_method(_MD("get_split_offset"),&SplitContainer::get_split_offset);

	ClassDB::bind_method(_MD("set_collapsed","collapsed"),&SplitContainer::set_collapsed);
	ClassDB::bind_method(_MD("is_collapsed"),&SplitContainer::is_collapsed);

	ClassDB::bind_method(_MD("set_dragger_visibility","mode"),&SplitContainer::set_dragger_visibility);
	ClassDB::bind_method(_MD("get_dragger_visibility"),&SplitContainer::get_dragger_visibility);

	ADD_SIGNAL( MethodInfo("dragged",PropertyInfo(Variant::INT,"offset")));

	ADD_PROPERTY( PropertyInfo(Variant::INT,"split_offset"),"set_split_offset","get_split_offset");
	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"collapsed"),"set_collapsed","is_collapsed");
	ADD_PROPERTY( PropertyInfo(Variant::INT,"dragger_visibility",PROPERTY_HINT_ENUM,"Visible,Hidden,Hidden & Collapsed"),"set_dragger_visibility","get_dragger_visibility");

	BIND_CONSTANT( DRAGGER_VISIBLE );
	BIND_CONSTANT( DRAGGER_HIDDEN );
	BIND_CONSTANT( DRAGGER_HIDDEN_COLLAPSED );

}

SplitContainer::SplitContainer(bool p_vertical) {


	mouse_inside=false;
	expand_ofs=0;
	middle_sep=0;
	vertical=p_vertical;
	dragging=false;
	collapsed=false;
	dragger_visibility=DRAGGER_VISIBLE;

}