/*
 * Copyright (C) 2017 Ben Loftis <ben@harrisonconsoles.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
#include <cmath>

#include "pot.h"
#include "surface.h"
#include "control_group.h"

using namespace ArdourSurface;
using namespace US2400;

int const Pot::External = 0x2e; /* specific ID for "vpot" representing external control */
int const Pot::ID       = 0x10; /* base value for v-pot IDs */

Control*
Pot::factory (Surface& surface, int id, const char* name, Group& group)
{
	Pot* p = new Pot (id, name, group);
	surface.pots[id] = p;
	surface.controls.push_back (p);
	group.add (*p);
	return p;
}

MidiByteArray
Pot::set (float val, bool onoff)
{
	int posi = lrintf (128.0 * val);
	if (posi == last_update_position) {
		if (posi == llast_update_position) {
			return MidiByteArray();
		}
	}
	llast_update_position = last_update_position;
	last_update_position = posi;

	// TODO do an exact calc for 0.50? To allow manually re-centering the port.

	// center on if val is "very close" to 0.50
	MIDI::byte msg =  (val > 0.48 && val < 0.58 ? 1 : 0) << 6;

	// Pot/LED mode
	msg |=  (_mode << 4);

	/*
	 * Even though a width value may be negative, there is
	 * technically still width there, it is just reversed,
	 * so make sure to show it on the LED ring appropriately.
	 */
	if (val < 0){
	  val = val * -1;
	}

	// val, but only if off hasn't explicitly been set
	if (onoff) {
		if (_mode == spread) {
			msg |=  (lrintf (val * 6)) & 0x0f; // 0b00001111
		} else {
			msg |=  (lrintf (val * 10.0) + 1) & 0x0f; // 0b00001111
		}
	}

	/* outbound LED message requires 0x20 to be added to the LED's id
	 */

	return MidiByteArray (3, 0xb0, 0x20 + id(), msg);

}