/*************************************************************************/
/*  slider.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 "slider.h"
#include "os/keyboard.h"


Size2 Slider::get_minimum_size() const {

	Ref<StyleBox> style = get_stylebox("slider");
	Size2i ms = style->get_minimum_size()+style->get_center_size();
	return ms;
}

void Slider::_input_event(InputEvent p_event) {



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

		InputEventMouseButton &mb = p_event.mouse_button;
		if (mb.button_index==BUTTON_LEFT) {

			if (mb.pressed)	{
				Ref<Texture> grabber = get_icon(mouse_inside||has_focus()?"grabber_hilite":"grabber");				
				grab.pos=orientation==VERTICAL?mb.y:mb.x;
				double grab_width = (double)grabber->get_size().width;
				double grab_height = (double)grabber->get_size().height;
				double max = orientation==VERTICAL ? get_size().height - grab_height : get_size().width - grab_width;
				if (orientation==VERTICAL)
					set_unit_value( 1 - (((double)grab.pos - (grab_height / 2.0)) / max) );
				else
					set_unit_value(((double)grab.pos - (grab_width/2.0)) / max);
				grab.active=true;
				grab.uvalue=get_unit_value();
			} else {
				grab.active=false;
			}
		} else if (mb.pressed && mb.button_index==BUTTON_WHEEL_UP) {

			set_value( get_value() + get_step());
		} else if (mb.pressed && mb.button_index==BUTTON_WHEEL_DOWN) {
			set_value( get_value() - get_step());
		}

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

		if (grab.active) {

			Size2i size = get_size();
			Ref<Texture> grabber = get_icon("grabber");
			float motion =  (orientation==VERTICAL?p_event.mouse_motion.y:p_event.mouse_motion.x) - grab.pos;
			if (orientation==VERTICAL)
				motion=-motion;
			float areasize = orientation==VERTICAL?size.height - grabber->get_size().height:size.width - grabber->get_size().width;
			if (areasize<=0)
				return;
			float umotion = motion / float(areasize);
			set_unit_value( grab.uvalue + umotion );
		}
	} else {

		if (p_event.is_action("ui_left") && p_event.is_pressed()) {

			if (orientation!=HORIZONTAL)
				return;
			set_value( get_value() - (custom_step>=0?custom_step:get_step()) );
			accept_event();
		} else if (p_event.is_action("ui_right") && p_event.is_pressed()) {

			if (orientation!=HORIZONTAL)
				return;
			set_value( get_value() + (custom_step>=0?custom_step:get_step()) );
			accept_event();
		} else if (p_event.is_action("ui_up") && p_event.is_pressed()) {

			if (orientation!=VERTICAL)
				return;

			set_value( get_value() + (custom_step>=0?custom_step:get_step()) );
			accept_event();
		} else if (p_event.is_action("ui_down") && p_event.is_pressed()) {

			if (orientation!=VERTICAL)
				return;
			set_value( get_value() - (custom_step>=0?custom_step:get_step()) );
			accept_event();

		} else if (p_event.type==InputEvent::KEY) {

			const InputEventKey &k=p_event.key;

			if (!k.pressed)
				return;

			switch (k.scancode) {

				case KEY_HOME: {

					set_value( get_min() );
					accept_event();
				} break;
				case KEY_END: {

					set_value( get_max() );
					accept_event();

				} break;

			} ;
		}
	}

}

void Slider::_notification(int p_what) {


	switch(p_what) {

		case NOTIFICATION_MOUSE_ENTER: {

			mouse_inside=true;
			update();
		} break;
		case NOTIFICATION_MOUSE_EXIT: {

			mouse_inside=false;
			update();
		} break;
		case NOTIFICATION_DRAW: {
			RID ci = get_canvas_item();
			Size2i size = get_size();
			Ref<StyleBox> style = get_stylebox("slider");
			Ref<StyleBox> focus = get_stylebox("focus");
			Ref<Texture> grabber = get_icon(mouse_inside||has_focus()?"grabber_hilite":"grabber");
			Ref<Texture> tick = get_icon("tick");

			if (orientation==VERTICAL) {

				style->draw(ci,Rect2i(Point2i(),Size2i(style->get_minimum_size().width+style->get_center_size().width,size.height)));
				//if (mouse_inside||has_focus())
				//	focus->draw(ci,Rect2i(Point2i(),Size2i(style->get_minimum_size().width+style->get_center_size().width,size.height)));
				float areasize = size.height - grabber->get_size().height;
				if (ticks>1) {
					int tickarea = size.height - tick->get_height();
					for(int i=0;i<ticks;i++) {
					        if( ! ticks_on_borders && (i == 0 || i + 1 == ticks) ) continue;
						int ofs = i*tickarea/(ticks-1);
						tick->draw(ci,Point2(0,ofs));
					}

				}
				grabber->draw(ci,Point2i(size.width/2-grabber->get_size().width/2,size.height - get_unit_value()*areasize - grabber->get_size().height));
			} else {
				style->draw(ci,Rect2i(Point2i(),Size2i(size.width,style->get_minimum_size().height+style->get_center_size().height)));
				//if (mouse_inside||has_focus())
				//	focus->draw(ci,Rect2i(Point2i(),Size2i(size.width,style->get_minimum_size().height+style->get_center_size().height)));

				float areasize = size.width - grabber->get_size().width;
				if (ticks>1) {
					int tickarea = size.width - tick->get_width();
					for(int i=0;i<ticks;i++) {
					        if( (! ticks_on_borders) && ( (i == 0) || ((i + 1) == ticks)) ) continue;
						int ofs = i*tickarea/(ticks-1);
						tick->draw(ci,Point2(ofs,0));
					}

				}
				grabber->draw(ci,Point2i(get_unit_value()*areasize,size.height/2-grabber->get_size().height/2));
			}

		} break;
	}
}

void Slider::set_custom_step(float p_custom_step) {

	custom_step=p_custom_step;
}

float Slider::get_custom_step() const {

	return custom_step;
}

void Slider::set_ticks(int p_count) {

	ticks=p_count;
	update();
}

int Slider::get_ticks() const {

	return ticks;
}

bool Slider::get_ticks_on_borders() const{
	return ticks_on_borders;
}

void Slider::set_ticks_on_borders(bool _tob){
	ticks_on_borders = _tob;
	update();
}

void Slider::_bind_methods() {

	ClassDB::bind_method(_MD("_input_event"),&Slider::_input_event);
	ClassDB::bind_method(_MD("set_ticks","count"),&Slider::set_ticks);
	ClassDB::bind_method(_MD("get_ticks"),&Slider::get_ticks);

	ClassDB::bind_method(_MD("get_ticks_on_borders"),&Slider::get_ticks_on_borders);
	ClassDB::bind_method(_MD("set_ticks_on_borders","ticks_on_border"),&Slider::set_ticks_on_borders);

	ADD_PROPERTY( PropertyInfo( Variant::INT, "tick_count", PROPERTY_HINT_RANGE,"0,4096,1"), _SCS("set_ticks"), _SCS("get_ticks") );
        ADD_PROPERTY( PropertyInfo( Variant::BOOL, "ticks_on_borders" ), _SCS("set_ticks_on_borders"), _SCS("get_ticks_on_borders") );
	ADD_PROPERTY( PropertyInfo( Variant::INT,"focus_mode", PROPERTY_HINT_ENUM, "None,Click,All" ), _SCS("set_focus_mode"), _SCS("get_focus_mode") );

}

Slider::Slider(Orientation p_orientation) {
	orientation=p_orientation;
	mouse_inside=false;
	grab.active=false;
	ticks=0;
	custom_step=-1;
	set_focus_mode(FOCUS_ALL);
}
