/*************************************************************************/
/*  range.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 "range.h"



void Range::_value_changed_notify() {

	_value_changed(shared->val);
	emit_signal("value_changed",shared->val);
	update();
	_change_notify("range/value");
}

void Range::Shared::emit_value_changed() {

	for (Set<Range*>::Element *E=owners.front();E;E=E->next()) {
		Range *r=E->get();
		if (!r->is_inside_tree())
			continue;
		r->_value_changed_notify();
	}
}

void Range::_changed_notify(const char *p_what) {

	emit_signal("changed",shared->val);
	update();
	_change_notify(p_what);
}

void Range::Shared::emit_changed(const char *p_what) {

	for (Set<Range*>::Element *E=owners.front();E;E=E->next()) {
		Range *r=E->get();
		if (!r->is_inside_tree())
			continue;
		r->_changed_notify(p_what);
	}
}


void Range::set_value(double p_val) {

	if(_rounded_values){
		p_val = Math::round(p_val);
	}

	if (p_val>shared->max-shared->page)
		p_val=shared->max-shared->page;

	if (p_val<shared->min)
		p_val=shared->min;

	if (shared->val==p_val)
		return;

	shared->val=p_val;

	shared->emit_value_changed();
}
void Range::set_min(double p_min) {

	shared->min=p_min;
	set_value(shared->val);

	shared->emit_changed("range/min");
}
void Range::set_max(double p_max) {

	shared->max=p_max;
	set_value(shared->val);

	shared->emit_changed("range/max");

}
void Range::set_step(double p_step) {

	shared->step=p_step;
	shared->emit_changed("range/step");

}
void Range::set_page(double p_page) {

	shared->page=p_page;
	set_value(shared->val);

	shared->emit_changed("range/page");
}

double Range::get_value() const {

	return shared->val;
}
double Range::get_min() const {

	return shared->min;
}
double Range::get_max() const {

	return shared->max;
}
double Range::get_step() const {

	return shared->step;
}
double Range::get_page() const {

	return shared->page;
}

void Range::set_as_ratio(double p_value) {

	double v;

	if (shared->exp_ratio && get_min()>0) {

		double exp_min = Math::log(get_min())/Math::log(2);
		double exp_max = Math::log(get_max())/Math::log(2);
		v = Math::pow(2,exp_min+(exp_max-exp_min)*p_value);
	} else {

		double percent = (get_max() - get_min()) * p_value;
		if (get_step() > 0) {
			double steps = round(percent / get_step());
			v = steps * get_step() + get_min();
		} else {
			v = percent + get_min();
		}
	}
	set_value( v );
}
double Range::get_as_ratio() const {

	if (shared->exp_ratio && get_min()>0) {

		double exp_min = Math::log(get_min())/Math::log(2);
		double exp_max = Math::log(get_max())/Math::log(2);
		double v = Math::log(get_value())/Math::log(2);

		return (v - exp_min) / (exp_max - exp_min);

	} else {

		return (get_value() - get_min()) / (get_max() - get_min());
	}
}

void Range::_share(Node *p_range) {

	Range * r = p_range->cast_to<Range>();
	ERR_FAIL_COND(!r);
	share(r);
}

void Range::share(Range *p_range) {

	ERR_FAIL_NULL(p_range);

	p_range->_ref_shared(shared);
	p_range->_changed_notify();
	p_range->_value_changed_notify();
}

void Range::unshare() {

	Shared * nshared = memnew(Shared);
	nshared->min=shared->min;
	nshared->max=shared->max;
	nshared->val=shared->val;
	nshared->step=shared->step;
	nshared->page=shared->page;
	_unref_shared();
	_ref_shared(nshared);
}

void Range::_ref_shared(Shared *p_shared) {

	if (shared && p_shared==shared)
		return;

	_unref_shared();
	shared=p_shared;
	shared->owners.insert(this);
}


void Range::_unref_shared() {

	shared->owners.erase(this);
	if (shared->owners.size()==0) {
		memdelete(shared);
		shared=NULL;
	}
}

void Range::_bind_methods() {

	ClassDB::bind_method(_MD("get_value"),&Range::get_value);
	ClassDB::bind_method(_MD("get_min"),&Range::get_min);
	ClassDB::bind_method(_MD("get_max"),&Range::get_max);
	ClassDB::bind_method(_MD("get_step"),&Range::get_step);
	ClassDB::bind_method(_MD("get_page"),&Range::get_page);
	ClassDB::bind_method(_MD("get_as_ratio"),&Range::get_as_ratio);
	ClassDB::bind_method(_MD("set_value","value"),&Range::set_value);
	ClassDB::bind_method(_MD("set_min","minimum"),&Range::set_min);
	ClassDB::bind_method(_MD("set_max","maximum"),&Range::set_max);
	ClassDB::bind_method(_MD("set_step","step"),&Range::set_step);
	ClassDB::bind_method(_MD("set_page","pagesize"),&Range::set_page);
	ClassDB::bind_method(_MD("set_as_ratio","value"),&Range::set_as_ratio);
	ClassDB::bind_method(_MD("set_use_rounded_values","enabled"),&Range::set_use_rounded_values);
	ClassDB::bind_method(_MD("is_using_rounded_values"),&Range::is_using_rounded_values);
	ClassDB::bind_method(_MD("set_exp_ratio","enabled"),&Range::set_exp_ratio);
	ClassDB::bind_method(_MD("is_ratio_exp"),&Range::is_ratio_exp);

	ClassDB::bind_method(_MD("share","with"),&Range::_share);
	ClassDB::bind_method(_MD("unshare"),&Range::unshare);

	ADD_SIGNAL( MethodInfo("value_changed", PropertyInfo(Variant::REAL,"value")));
	ADD_SIGNAL( MethodInfo("changed"));

	ADD_PROPERTY( PropertyInfo( Variant::REAL, "min_value" ), _SCS("set_min"), _SCS("get_min") );
	ADD_PROPERTY( PropertyInfo( Variant::REAL, "max_value" ), _SCS("set_max"), _SCS("get_max") );
	ADD_PROPERTY( PropertyInfo( Variant::REAL, "step" ), _SCS("set_step"), _SCS("get_step") );
	ADD_PROPERTY( PropertyInfo( Variant::REAL, "page" ), _SCS("set_page"), _SCS("get_page") );
	ADD_PROPERTY( PropertyInfo( Variant::REAL, "value" ), _SCS("set_value"), _SCS("get_value") );
	ADD_PROPERTY( PropertyInfo( Variant::BOOL, "exp_edit" ), _SCS("set_exp_ratio"), _SCS("is_ratio_exp") );
	ADD_PROPERTY( PropertyInfo( Variant::BOOL, "rounded" ), _SCS("set_use_rounded_values"), _SCS("is_using_rounded_values") );

}

void Range::set_use_rounded_values(bool p_enable) {

	_rounded_values = p_enable;
}

bool Range::is_using_rounded_values() const {

	return _rounded_values;
}

void Range::set_exp_ratio(bool p_enable) {

	shared->exp_ratio=p_enable;
}

bool Range::is_ratio_exp() const {

	return shared->exp_ratio;
}


Range::Range()
{
	shared = memnew(Shared);
	shared->min=0;
	shared->max=100;
	shared->val=
	shared->step=1;
	shared->page=0;
	shared->owners.insert(this);
	shared->exp_ratio=false;

	_rounded_values = false;
}


Range::~Range() {

	_unref_shared();
}