/*************************************************************************/
/*  cp_envelope.h                                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
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/* 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:                                             */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/

#ifndef CP_ENVELOPE_H
#define CP_ENVELOPE_H

#include "cp_config.h"

/**envelope?
  *@author Juan Linietsky
  */

/******************************
 envelope.h
 ----------

Proovides an envelope, and basic functions
for it that can be used for both player
and interface
********************************/

class CPEnvelope {
	enum {

		MAX_POINTS = 25
	};

	struct Point {

		uint16_t tick_offset;
		int16_t value;
	};

	Point node[MAX_POINTS];

	int8_t node_count;

	bool on;
	bool carry;

	bool loop_on;

	uint8_t loop_begin_node;
	uint8_t loop_end_node;

	bool sustain_loop_on;
	uint8_t sustain_loop_begin_node;
	uint8_t sustain_loop_end_node;

	int8_t max_value;
	int8_t min_value;

public:
	enum {

		NO_POINT = -5000,
	};

	void set_max(int8_t p_max) { max_value = p_max; }
	int8_t get_max() { return max_value; }
	void set_min(int8_t p_min) { min_value = p_min; }
	int8_t get_min() { return min_value; }

	uint8_t get_node_count();
	const Point &get_node(int p_idx);

	void set_position(int p_node, int p_x, int p_y);
	int add_position(int p_x, int p_y, bool p_move_loops = true);
	void del_position(int p_node);

	void set_loop_enabled(bool p_enabled);
	bool is_loop_enabled();
	void set_loop_begin(int pos);
	void set_loop_end(int pos);
	uint8_t get_loop_begin();
	uint8_t get_loop_end();

	void set_sustain_loop_enabled(bool p_enabled);
	bool is_sustain_loop_enabled();
	void set_sustain_loop_begin(int pos);
	void set_sustain_loop_end(int pos);
	uint8_t get_sustain_loop_begin();
	uint8_t get_sustain_loop_end();

	void set_enabled(bool p_enabled);
	bool is_enabled();

	void set_carry_enabled(bool p_enabled);
	bool is_carry_enabled();

	void reset();
	int get_height_at_pos(int pos);
	float get_interp_height_at_pos(float pos);

	CPEnvelope();
};

#endif