enum CURVE_TYPE {
	bezier,
	bounce,
	damping
}

globalvar ON_END_NAME;
ON_END_NAME = [ "Hold", "Loop", "Ping pong" ];

function valueKey(_time, _value, _anim = noone, _in = 0, _out = 0) constructor {
	time	= _time;
	ratio	= time / ANIMATOR.frames_total;
	value	= _value;
	anim	= _anim;
	
	ease_in	 = _in;
	ease_out = _out;
	
	ease_in_type  = CURVE_TYPE.bezier;
	ease_out_type = CURVE_TYPE.bezier;
	
	static setTime = function(time) {
		self.time = time;	
		ratio	= time / ANIMATOR.frames_total;
	}
}

function valueAnimator(_val, _prop) constructor {
	values  = ds_list_create();
	show_graph = false;
	ds_list_add(values, new valueKey(0, _val, self));
	
	is_anim    = false;
	prop       = _prop;
	
	static interpolate = function(from, to, rat) {
		if(from.ease_out == 0 && to.ease_in == 0) 
			return rat;
		
		var eo = rat;
		var ei = rat;
		
		if(from.ease_out != 0) {
			switch(from.ease_out_type) {
				case CURVE_TYPE.bezier : 
					eo = ease_cubic_in(rat);
					eo = lerp(rat, eo, from.ease_out);
					break;
				case CURVE_TYPE.damping : 
					eo = ease_damp_in(rat, 1 + from.ease_out * 10);
					break;
			}
		}
		
		if(to.ease_in != 0) {
			switch(to.ease_in_type) {
				case CURVE_TYPE.bezier  : 
					ei = ease_cubic_out(rat);
					ei = lerp(rat, ei, to.ease_in);
					break;
				case CURVE_TYPE.damping : 
					ei = ease_damp_out(rat, 1 + to.ease_in * 10);
					break;
			}
		}
		
		if(from.ease_out_type == CURVE_TYPE.damping && to.ease_in_type == CURVE_TYPE.damping) 
			return lerp(eo, ei, rat < 0.5 ? 4 * power(rat, 3) : 1 - power(-2 * rat + 2, 3) / 2);
		
		return lerp(eo, ei, rat);
	}
	
	static getValue = function(_time = ANIMATOR.current_frame) {
		if(prop.display_type == VALUE_DISPLAY.gradient) return processType(values);
		if(prop.type == VALUE_TYPE.path) return processType(values[| 0].value);
		
		if(ds_list_size(values) == 0) return processType(0);
		if(ds_list_size(values) == 1) return processType(values[| 0].value);
		if(!is_anim) return processType(values[| 0].value);
		
		if(ds_list_size(values) > 1) {
			var _time_first = values[| 0].time;
			var _time_last  = values[| ds_list_size(values) - 1].time;
			var _time_dura  = _time_last - _time_first;
			
			if(_time > _time_last) {
				switch(prop.on_end) {
					case KEYFRAME_END.loop : 
						_time = _time_first + safe_mod(_time - _time_last, _time_dura + 1);
						break;
					case KEYFRAME_END.ping :
						var time_in_loop = safe_mod(_time - _time_first, _time_dura * 2);
						if(time_in_loop < _time_dura) 
							_time = _time_first + time_in_loop;
						else
							_time = _time_first + _time_dura * 2 - time_in_loop;
						break;
				}
			}
		}
		
		for(var i = 0; i < ds_list_size(values); i++) {
			var _key = values[| i];
			if(_key.time > _time) {
				if(i == 0) 
					return processType(values[| 0].value);
				else {
					var rat = (_time - values[| i - 1].time) / (values[| i].time - values[| i - 1].time);
					var from = values[| i - 1];
					var to = values[| i];
					var _lerp = interpolate(from, to, rat);
						
					if(prop.type == VALUE_TYPE.color) {
						return processType(merge_color(from.value, to.value, _lerp));
					} else if(typeArray(prop.display_type) && is_array(from.value)) {
						var _vec = array_create(array_length(from.value));
						for(var i = 0; i < array_length(_vec); i++) 
							_vec[i] = processType(lerp(from.value[i], to.value[i], _lerp));
						return _vec;
					} else if(prop.type == VALUE_TYPE.text) {
						return processType(from.value);
					} else {
						return processType(lerp(from.value, to.value, _lerp));
					}
				}
			}
		}
		return processType(values[| ds_list_size(values) - 1].value);
	}
	
	static processType = function(_val) {
		if(typeArray(prop.display_type) && is_array(_val)) {
			for(var i = 0; i < array_length(_val); i++) 
				_val[i] = processValue(_val[i]);			
			return _val;
		}
		return processValue(_val);
	}
	static processValue = function(_val) {
		if(is_array(_val)) return _val;
		
		if(prop.type == VALUE_TYPE.integer && prop.unit.mode == VALUE_UNIT.constant)
			return round(toNumber(_val));
			
		switch(prop.type) {
			case VALUE_TYPE.integer : 
			case VALUE_TYPE.float   : return toNumber(_val);
			case VALUE_TYPE.text    : return string(_val);
			case VALUE_TYPE.surface : 
				if(is_string(_val))
					return get_asset(_val);
				return is_surface(_val)? _val : DEF_SURFACE;
		}
		
		return _val;
	}
	
	static setKeyTime = function(_key, _time, _replace = true) {
		if(!ds_list_exist(values, _key)) return 0;
		MODIFIED = true;
		
		_time = clamp(_time, 0, ANIMATOR.frames_total - 1);
		_key.setTime(_time);
		ds_list_remove(values, _key);
		
		if(_replace) {
			for( var i = 0; i < ds_list_size(values); i++ ) {
				if(values[| i].time == _time) {
					values[| i] = _key;
					return 2;
				}
			}
		}
		
		for( var i = 0; i < ds_list_size(values); i++ ) {
			if(values[| i].time > _time) {
				ds_list_insert(values, i, _key);
				return 1;
			}
		}
		
		ds_list_add(values, _key);
		return 1;
	}
	
	static setValue = function(_val = 0, _record = true, _time = ANIMATOR.current_frame, ease_in = 0, ease_out = 0) {
		MODIFIED = true;
		
		if(!is_anim) {
			if(isEqual(values[| 0].value, _val)) 
				return false;
			
			if(_record)
				recordAction(ACTION_TYPE.var_modify, values[| 0], [ values[| 0].value, "value" ]);
			values[| 0].value = _val;
			return true;
		}
		
		if(ds_list_size(values) == 0) {
			var k = new valueKey(_time, _val, self, ease_in, ease_out);
			ds_list_add(values, k);
			if(_record)
				recordAction(ACTION_TYPE.list_insert, values, [ k, ds_list_size(values) - 1 ]);
			return true;
		}
		
		for(var i = 0; i < ds_list_size(values); i++) {
			var _key = values[| i];
			if(_key.time == _time) {
				if(_record) 
					recordAction(ACTION_TYPE.var_modify, _key, [ _key.value, "value" ]);
				if(_key.value != _val) {
					_key.value = _val;
					return true;
				}
				return false;
			} else if(_key.time > _time) {
				var k = new valueKey(_time, _val, self, ease_in, ease_out);
				ds_list_insert(values, i, k);
				if(_record)
					recordAction(ACTION_TYPE.list_insert, values, [k, i]);
				return true;
			}
		}
		
		var k = new valueKey(_time, _val, self, ease_in, ease_out);
		ds_list_add(values, k);
		if(_record)
			recordAction(ACTION_TYPE.list_insert, values, [ k, ds_list_size(values) - 1 ]);
		return true;
	}
	
	static removeKey = function(key) {
		if(ds_list_size(values) > 1)
			ds_list_remove(values, key);
		else
			is_anim = false;
	}
	
	static serialize = function(scale = false) {
		var _list = ds_list_create();
		
		for(var i = 0; i < ds_list_size(values); i++) {
			var _value_list = ds_list_create();
			if(scale && prop.display_type != VALUE_DISPLAY.gradient)
				_value_list[| 0] = values[| i].time / (ANIMATOR.frames_total - 1);
			else
				_value_list[| 0] = values[| i].time;
			
			if(typeArray(prop.display_type) && is_array(values[| i].value)) {
				var __v = ds_list_create();
				for(var j = 0; j < array_length(values[| i].value); j++)
					ds_list_add(__v, values[| i].value[j]);
				_value_list[| 1] = __v;
				ds_list_mark_as_list(_value_list, 1);
			} else {
				_value_list[| 1] = values[| i].value;
			}
			
			_value_list[| 2] = values[| i].ease_in;
			_value_list[| 3] = values[| i].ease_out;
			_value_list[| 4] = values[| i].ease_in_type;
			_value_list[| 5] = values[| i].ease_out_type;
			
			ds_list_add(_list, _value_list);
			ds_list_mark_as_list(_list, i);
		}
		
		return _list;
	}
	
	static deserialize = function(_list, scale = false) {
		var base = getValue();
		ds_list_clear(values);
		
		for(var i = 0; i < ds_list_size(_list); i++) {
			var _key  = _list[| i];
			var _time = _key[| 0];
			if(prop.display_type == VALUE_DISPLAY.gradient) 
				_time = _key[| 0];
			else if(scale && _key[| 0] <= 1)
				_time = round(_key[| 0] * (ANIMATOR.frames_total - 1));
			
			var value    = ds_list_get(_key, 1);
			var ease_in  = ds_list_get(_key, 2);
			var ease_out = ds_list_get(_key, 3);
			var ease_in_type  = ds_list_get(_key, 4, CURVE_TYPE.bezier);
			var ease_out_type = ds_list_get(_key, 5, CURVE_TYPE.bezier);
			var _val  = _key[| 1];
			
			if(prop.type == VALUE_TYPE.path && prop.display_type == VALUE_DISPLAY.path_array) {
				for(var j = 0; j < ds_list_size(value); j++)
					_val[j] = value[| j];
			} else if(typeArray(prop.display_type) && is_array(base)) {
				_val = array_create(array_length(base));
					
				if(ds_exists(_key[| 1], ds_type_list)) {
					for(var j = 0; j < ds_list_size(_key[| 1]); j++)
						_val[j] = processValue(value[| j]);
				}
			} 
			
			var vk = new valueKey(_time, _val, self, ease_in, ease_out);
			vk.ease_in_type  = ease_in_type;
			vk.ease_out_type = ease_out_type;
			ds_list_add(values, vk);
		}
	}
	
	static cleanUp = function() {
		ds_list_destroy(values);
	}
}