/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "../inc/MarlinConfig.h"

#if ENABLED(MIXING_EXTRUDER)

//#define MIXER_NORMALIZER_DEBUG

#include "mixing.h"

Mixer mixer;

#ifdef MIXER_NORMALIZER_DEBUG
  #include "../core/serial.h"
#endif

// Used up to Planner level
uint_fast8_t Mixer::selected_vtool = 0;
float        Mixer::collector[MIXING_STEPPERS]; // mix proportion. 0.0 = off, otherwise <= COLOR_A_MASK.
mixer_comp_t Mixer::color[NR_MIXING_VIRTUAL_TOOLS][MIXING_STEPPERS];

// Used in Stepper
int_fast8_t  Mixer::runner = 0;
mixer_comp_t Mixer::s_color[MIXING_STEPPERS];
mixer_accu_t Mixer::accu[MIXING_STEPPERS] = { 0 };

void Mixer::normalize(const uint8_t tool_index) {
  float cmax = 0;
  #ifdef MIXER_NORMALIZER_DEBUG
    float csum = 0;
  #endif
  MIXER_STEPPER_LOOP(i) {
    const float v = collector[i];
    NOLESS(cmax, v);
    #ifdef MIXER_NORMALIZER_DEBUG
      csum += v;
    #endif
  }
  #ifdef MIXER_NORMALIZER_DEBUG
    SERIAL_ECHOPGM("Mixer: Old relation : [ ");
    MIXER_STEPPER_LOOP(i) {
      SERIAL_ECHO_F(collector[i] / csum, 3);
      SERIAL_CHAR(' ');
    }
    SERIAL_ECHOLNPGM("]");
  #endif

  // Scale all values so their maximum is COLOR_A_MASK
  const float inverse_max = RECIPROCAL(cmax);
  MIXER_STEPPER_LOOP(i)
    color[tool_index][i] = collector[i] * COLOR_A_MASK * inverse_max;

  #ifdef MIXER_NORMALIZER_DEBUG
    csum = 0;
    SERIAL_ECHOPGM("Mixer: Normalize to : [ ");
    MIXER_STEPPER_LOOP(i) {
      SERIAL_ECHO(uint16_t(color[tool_index][i]));
      SERIAL_CHAR(' ');
      csum += color[tool_index][i];
    }
    SERIAL_ECHOLNPGM("]");
    SERIAL_ECHOPGM("Mixer: New relation : [ ");
    MIXER_STEPPER_LOOP(i) {
      SERIAL_ECHO_F(uint16_t(color[tool_index][i]) / csum, 3);
      SERIAL_CHAR(' ');
    }
    SERIAL_ECHOLNPGM("]");
  #endif
}

void Mixer::reset_vtools() {
  // Virtual Tools 0, 1, 2, 3 = Filament 1, 2, 3, 4, etc.
  // Every virtual tool gets a pure filament
  for (uint8_t t = 0; t < MIXING_VIRTUAL_TOOLS && t < MIXING_STEPPERS; t++)
    MIXER_STEPPER_LOOP(i)
      color[t][i] = (t == i) ? COLOR_A_MASK : 0;

  // Remaining virtual tools are 100% filament 1
  #if MIXING_VIRTUAL_TOOLS > MIXING_STEPPERS
    for (uint8_t t = MIXING_STEPPERS; t < MIXING_VIRTUAL_TOOLS; t++)
      MIXER_STEPPER_LOOP(i)
        color[t][i] = (i == 0) ? COLOR_A_MASK : 0;
  #endif
}

// called at boot
void Mixer::init() {

  reset_vtools();

  #if ENABLED(RETRACT_SYNC_MIXING)
    // AUTORETRACT_TOOL gets the same amount of all filaments
    MIXER_STEPPER_LOOP(i)
      color[MIXER_AUTORETRACT_TOOL][i] = COLOR_A_MASK;
  #endif

  ZERO(collector);
}

#endif // MIXING_EXTRUDER