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/* Copyright 2020 3araht
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#include QMK_KEYBOARD_H
#include "version.h"

// Alias layout macros that expand groups of keys.
#define LAYOUT_wrapper_giabarinaix2(...) LAYOUT_giabarinaix2(__VA_ARGS__)

#define DFCBASE DF(_C_SYSTEM_BASE)
#define DF_QWER DF(_QWERTY)
// Long press: go to _FN layer, tap: MUTE
#define FN_MUTE LT(_FN, KC_MUTE)

// Used to set octave to MI_OCT_0
extern midi_config_t midi_config;
uint8_t midi_bass_ch = 0, midi_chord_ch = 0;  // By default, all use the same channel.

#ifdef RGBLIGHT_ENABLE
/* used to specify there is no LED on the keylocation. */
#    define NO_LED 255
#endif  //  RGBLIGHT_ENABLE
// Defines names for use in layer keycodes and the keymap
enum layer_names {
    _C_SYSTEM_BASE,      //  MIDI C-system
    _C_SYSTEM_BASS2ROW,  //  counter bass system
    _C_SYSTEM_ENTIRELY,  //  single notes for both left and right keybaords.
    _CHROMATONE,
    _QWERTY,             //  just in case
    _FN
};

// Defines the keycodes used by our macros in process_record_user
enum custom_keycodes {

    // MIDI Chord Keycodes - Root notes
    MY_CHORD_MIN = SAFE_RANGE,

    MI_CH_Cr = MY_CHORD_MIN,
    MI_CH_Csr,
    MI_CH_Dbr = MI_CH_Csr,
    MI_CH_Dr,
    MI_CH_Dsr,
    MI_CH_Ebr = MI_CH_Dsr,
    MI_CH_Er,
    MI_CH_Fr,
    MI_CH_Fsr,
    MI_CH_Gbr = MI_CH_Fsr,
    MI_CH_Gr,
    MI_CH_Gsr,
    MI_CH_Abr = MI_CH_Gsr,
    MI_CH_Ar,
    MI_CH_Asr,
    MI_CH_Bbr = MI_CH_Asr,
    MI_CH_Br,

    // MIDI Chord Keycodes - Major

    MI_CH_C,
    MI_CH_Cs,
    MI_CH_Db = MI_CH_Cs,
    MI_CH_D,
    MI_CH_Ds,
    MI_CH_Eb = MI_CH_Ds,
    MI_CH_E,
    MI_CH_F,
    MI_CH_Fs,
    MI_CH_Gb = MI_CH_Fs,
    MI_CH_G,
    MI_CH_Gs,
    MI_CH_Ab = MI_CH_Gs,
    MI_CH_A,
    MI_CH_As,
    MI_CH_Bb = MI_CH_As,
    MI_CH_B,

    // MIDI Chord Keycodes Minor

    MI_CH_Cm,
    MI_CH_Csm,
    MI_CH_Dbm = MI_CH_Csm,
    MI_CH_Dm,
    MI_CH_Dsm,
    MI_CH_Ebm = MI_CH_Dsm,
    MI_CH_Em,
    MI_CH_Fm,
    MI_CH_Fsm,
    MI_CH_Gbm = MI_CH_Fsm,
    MI_CH_Gm,
    MI_CH_Gsm,
    MI_CH_Abm = MI_CH_Gsm,
    MI_CH_Am,
    MI_CH_Asm,
    MI_CH_Bbm = MI_CH_Asm,
    MI_CH_Bm,

    //MIDI Chord Keycodes Dominant Seventh

    MI_CH_CDom7,
    MI_CH_CsDom7,
    MI_CH_DbDom7 = MI_CH_CsDom7,
    MI_CH_DDom7,
    MI_CH_DsDom7,
    MI_CH_EbDom7 = MI_CH_DsDom7,
    MI_CH_EDom7,
    MI_CH_FDom7,
    MI_CH_FsDom7,
    MI_CH_GbDom7 = MI_CH_FsDom7,
    MI_CH_GDom7,
    MI_CH_GsDom7,
    MI_CH_AbDom7 = MI_CH_GsDom7,
    MI_CH_ADom7,
    MI_CH_AsDom7,
    MI_CH_BbDom7 = MI_CH_AsDom7,
    MI_CH_BDom7,

    // MIDI Chord Keycodes Diminished Seventh

    MI_CH_CDim7,
    MI_CH_CsDim7,
    MI_CH_DbDim7 = MI_CH_CsDim7,
    MI_CH_DDim7,
    MI_CH_DsDim7,
    MI_CH_EbDim7 = MI_CH_DsDim7,
    MI_CH_EDim7,
    MI_CH_FDim7,
    MI_CH_FsDim7,
    MI_CH_GbDim7 = MI_CH_FsDim7,
    MI_CH_GDim7,
    MI_CH_GsDim7,
    MI_CH_AbDim7 = MI_CH_GsDim7,
    MI_CH_ADim7,
    MI_CH_AsDim7,
    MI_CH_BbDim7 = MI_CH_AsDim7,
    MI_CH_BDim7,

    MY_CHORD_MAX = MI_CH_BDim7,

    VERSION,
    CSYSTEM,  // C-SYSTEM layout
    CNTBASC,  // CouNTer BASs C-system layout
    CSYSALL,  // C-SYStem ALL layout
    CHRTONE,  // CHRomaTONE layout
    TGLMICH   // ToGgLe MIdi CHannel separation
};

#define MY_CHORD_COUNT (MY_CHORD_MAX - MY_CHORD_MIN + 1)
static uint8_t chord_status[MY_CHORD_COUNT];

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* C-system Base */
  [_C_SYSTEM_BASE] = LAYOUT_giabarinaix2(
    MI_CH_Dbr,    MI_CH_Abr,    MI_CH_Ebr,    MI_CH_Bbr,    MI_CH_Fr,    MI_CH_Cr,    MI_CH_Gr,    MI_CH_Dr,    MI_CH_Ar,    MI_CH_Er,    MI_CH_Br,    MI_CH_Fsr,
      MI_CH_Db,     MI_CH_Ab,     MI_CH_Eb,     MI_CH_Bb,     MI_CH_F,     MI_CH_C,     MI_CH_G,     MI_CH_D,     MI_CH_A,     MI_CH_E,     MI_CH_B,     MI_CH_Fs,
        MI_CH_Dbm,    MI_CH_Abm,    MI_CH_Ebm,    MI_CH_Bbm,    MI_CH_Fm,    MI_CH_Cm,    MI_CH_Gm,    MI_CH_Dm,    MI_CH_Am,    MI_CH_Em,    MI_CH_Bm,    MI_CH_Fsm,
          MI_CH_DbDom7, MI_CH_AbDom7, MI_CH_EbDom7, MI_CH_BbDom7, MI_CH_FDom7, MI_CH_CDom7, MI_CH_GDom7, MI_CH_DDom7, MI_CH_ADom7, MI_CH_EDom7, MI_CH_BDom7, MI_CH_FsDom7,
            MI_CH_DbDim7, MI_CH_AbDim7, MI_CH_EbDim7, MI_CH_BbDim7, MI_CH_FDim7, MI_CH_CDim7, MI_CH_GDim7, MI_CH_DDim7, MI_CH_ADim7, MI_CH_EDim7, MI_CH_BDim7, MI_CH_FsDim7,

    MI_Db_2,      MI_E_2,       MI_G_2,       MI_Bb_2,      MI_Db_3,     MI_E_3,      MI_G_3,      MI_Bb_3,     MI_Db_4,     MI_E_4,      MI_G_4,      MI_Bb_4,
      MI_Eb_2,      MI_Fs_2,      MI_A_2,       MI_C_3,       MI_Eb_3,     MI_Fs_3,     MI_A_3,      MI_C_4,      MI_Eb_4,     MI_Fs_4,     MI_A_4,      MI_C_5,
        MI_F_2,       MI_Ab_2,      MI_B_2,       MI_D_3,       MI_F_3,      MI_Ab_3,     MI_B_3,      MI_D_4,      MI_F_4,      MI_Ab_4,     MI_B_4,      MI_D_5,
          MI_G_2,       MI_Bb_2,      MI_Db_3,      MI_E_3,       MI_G_3,      MI_Bb_3,     MI_Db_4,     MI_E_4,      MI_G_4,      MI_Bb_4,     MI_Db_5,     MI_E_5,
            MI_A_2,       MI_C_3,       MI_Eb_3,      MI_Fs_3,      MI_A_3,      MI_C_4,      MI_Eb_4,     MI_Fs_4,     MI_A_4,      MI_C_5,      MI_Eb_5,     FN_MUTE
  ),

  /* BASS2row */
  [_C_SYSTEM_BASS2ROW] = LAYOUT_giabarinaix2(
    MI_CH_Fr,     MI_CH_Cr,     MI_CH_Gr,     MI_CH_Dr,     MI_CH_Ar,    MI_CH_Er,    MI_CH_Br,    MI_CH_Fsr,   MI_CH_Csr,   MI_CH_Gsr,   MI_CH_Dsr,   MI_CH_Asr,
      MI_CH_Dbr,    MI_CH_Abr,    MI_CH_Ebr,    MI_CH_Bbr,    MI_CH_Fr,    MI_CH_Cr,    MI_CH_Gr,    MI_CH_Dr,    MI_CH_Ar,    MI_CH_Er,    MI_CH_Br,    MI_CH_Fsr,
        MI_CH_Db,     MI_CH_Ab,     MI_CH_Eb,     MI_CH_Bb,     MI_CH_F,     MI_CH_C,     MI_CH_G,     MI_CH_D,     MI_CH_A,     MI_CH_E,     MI_CH_B,     MI_CH_Fs,
          MI_CH_Dbm,    MI_CH_Abm,    MI_CH_Ebm,    MI_CH_Bbm,    MI_CH_Fm,    MI_CH_Cm,    MI_CH_Gm,    MI_CH_Dm,    MI_CH_Am,    MI_CH_Em,    MI_CH_Bm,    MI_CH_Fsm,
            MI_CH_DbDom7, MI_CH_AbDom7, MI_CH_EbDom7, MI_CH_BbDom7, MI_CH_FDom7, MI_CH_CDom7, MI_CH_GDom7, MI_CH_DDom7, MI_CH_ADom7, MI_CH_EDom7, MI_CH_BDom7, MI_CH_FsDom7,


    MI_Db_2,      MI_E_2,       MI_G_2,       MI_Bb_2,      MI_Db_3,     MI_E_3,      MI_G_3,      MI_Bb_3,     MI_Db_4,     MI_E_4,      MI_G_4,      MI_Bb_4,
      MI_Eb_2,      MI_Fs_2,      MI_A_2,       MI_C_3,       MI_Eb_3,     MI_Fs_3,     MI_A_3,      MI_C_4,      MI_Eb_4,     MI_Fs_4,     MI_A_4,      MI_C_5,
        MI_F_2,       MI_Ab_2,      MI_B_2,       MI_D_3,       MI_F_3,      MI_Ab_3,     MI_B_3,      MI_D_4,      MI_F_4,      MI_Ab_4,     MI_B_4,      MI_D_5,
          MI_G_2,       MI_Bb_2,      MI_Db_3,      MI_E_3,       MI_G_3,      MI_Bb_3,     MI_Db_4,     MI_E_4,      MI_G_4,      MI_Bb_4,     MI_Db_5,     MI_E_5,
            MI_A_2,       MI_C_3,       MI_Eb_3,      MI_Fs_3,      MI_A_3,      MI_C_4,      MI_Eb_4,     MI_Fs_4,     MI_A_4,      MI_C_5,      MI_Eb_5,     FN_MUTE
  ),

  /* C-system entirely */
  [_C_SYSTEM_ENTIRELY] = LAYOUT_giabarinaix2(
    XXXXXXX, XXXXXXX, XXXXXXX, MI_Db,   MI_E,    MI_G,    MI_Bb,   MI_Db_1, MI_E_1,  MI_G_1,  MI_Bb_1, MI_Db_2,
      XXXXXXX, XXXXXXX, MI_C,    MI_Eb,   MI_Fs,   MI_A,    MI_C_1,  MI_Eb_1, MI_Fs_1, MI_A_1,  MI_C_2,  MI_Eb_2,
        XXXXXXX, XXXXXXX, MI_D,    MI_F,    MI_Ab,   MI_B,    MI_D_1,  MI_F_1,  MI_Ab_1, MI_B_1,  MI_D_2,  MI_F_2,
          XXXXXXX, MI_Db,   MI_E,    MI_G,    MI_Bb,   MI_Db_1, MI_E_1,  MI_G_1,  MI_Bb_1, MI_Db_2, MI_E_2,  MI_G_2,
            MI_C,    MI_Eb,   MI_Fs,   MI_A,    MI_C_1,  MI_Eb_1, MI_Fs_1, MI_A_1,  MI_C_2,  MI_Eb_2, MI_Fs_2, MI_A_2,

    MI_E_2,  MI_G_2,  MI_Bb_2, MI_Db_3, MI_E_3,  MI_G_3,  MI_Bb_3, MI_Db_4, MI_E_4,   MI_G_4, MI_Bb_4, MI_Db_5,
      MI_Fs_2, MI_A_2,  MI_C_3,  MI_Eb_3, MI_Fs_3, MI_A_3,  MI_C_4,  MI_Eb_4, MI_Fs_4,  MI_A_4, MI_C_5,  MI_Eb_5,
        MI_Ab_2, MI_B_2,  MI_D_3,  MI_F_3,  MI_Ab_3, MI_B_3,  MI_D_4,  MI_F_4,  MI_Ab_4, MI_B_4,  MI_D_5,  MI_F_5,
          MI_Bb_2, MI_Db_3, MI_E_3,  MI_G_3,  MI_Bb_3, MI_Db_4, MI_E_4,  MI_G_4,  MI_Bb_4, MI_Db_5, MI_E_5,  MI_G_5,
            MI_C_3,  MI_Eb_3, MI_Fs_3, MI_A_3,  MI_C_4,  MI_Eb_4, MI_Fs_4, MI_A_4,  MI_C_5,  MI_Eb_5, MI_Fs_5,  FN_MUTE
  ),

  /* Chromatone */
  [_CHROMATONE] = LAYOUT_giabarinaix2(
    XXXXXXX, XXXXXXX, MI_Db,   MI_Eb,   MI_F,    MI_G,    MI_A,    MI_B,    MI_Db_1,  MI_Eb_1,  MI_F_1,   MI_G_1,
        XXXXXXX,  MI_C,    MI_D,    MI_E,    MI_Fs,   MI_Ab,   MI_Bb,   MI_C_1,  MI_D_1,  MI_E_1,  MI_Fs_1, MI_Ab_1,
             XXXXXXX, MI_Db,   MI_Eb,   MI_F,    MI_G,    MI_A,    MI_B,    MI_Db_1,  MI_Eb_1,  MI_F_1,   MI_G_1,   MI_A_1,
                  MI_C,    MI_D,    MI_E,    MI_Fs,   MI_Ab,   MI_Bb,   MI_C_1,  MI_D_1,  MI_E_1,  MI_Fs_1, MI_Ab_1, MI_Bb_1,
                      MI_Db,   MI_Eb,   MI_F,    MI_G,    MI_A,    MI_B,    MI_Db_1,  MI_Eb_1,  MI_F_1,   MI_G_1,   MI_A_1,  MI_B_1,

    MI_A_1,  MI_B_1, MI_Db_2, MI_Eb_2, MI_F_2,  MI_G_2,  MI_A_2,  MI_B_2,  MI_Db_3,  MI_Eb_3,  MI_F_3,   MI_G_3,
         MI_Bb_1, MI_C_2,  MI_D_2,  MI_E_2,  MI_Gb_2, MI_Ab_2, MI_Bb_2, MI_C_3,  MI_D_3,  MI_E_3,  MI_Gb_3, MI_Ab_3,
             MI_B_1, MI_Db_2, MI_Eb_2, MI_F_2,  MI_G_2,  MI_A_2,  MI_B_2,  MI_Db_3,  MI_Eb_3,  MI_F_3,   MI_G_3,   MI_A_3,
                  MI_C_2,  MI_D_2,  MI_E_2,  MI_Gb_2, MI_Ab_2, MI_Bb_2, MI_C_3,  MI_D_3,  MI_E_3,  MI_Gb_3, MI_Ab_3, MI_Bb_3,
                     MI_Db_2, MI_Eb_2, MI_F_2,  MI_G_2,  MI_A_2,  MI_B_2,  MI_Db_3,  MI_Eb_3,  MI_F_3,   MI_G_3,   MI_A_3,  FN_MUTE
  ),

  /* QWERTY */
  [_QWERTY] = LAYOUT_wrapper_giabarinaix2(
    KC_GESC, _________________NUMBER_L__________________, _________________NUMBER_R__________________, KC_BSPC,
      KC_TAB,  _________________QWERTY_L1_________________, _________________QWERTY_R1_________________, KC_DEL,
        KC_CAPS, _________________QWERTY_L2_________________, _________________QWERTY_R2_________________, KC_ENT,
          KC_LSFT, _________________QWERTY_L3_________________, _________________QWERTY_R3_________________, KC_RSFT,
            KC_LCTL, KC_LGUI, KC_LALT, KC_LANG2, KC_SPC,  KC_SPC, KC_SPC, KC_SPC, KC_LANG1, KC_RALT,  KC_RGUI, KC_RCTRL,

    KC_GESC, _________________NUMBER_L__________________, _________________NUMBER_R__________________, KC_BSPC,
      KC_TAB,  _________________QWERTY_L1_________________, _________________QWERTY_R1_________________, KC_DEL,
        KC_CAPS, _________________QWERTY_L2_________________, _________________QWERTY_R2_________________, KC_ENT,
          KC_LSFT, _________________QWERTY_L3_________________, _________________QWERTY_R3_________________, KC_RSFT,
            KC_LCTL, KC_LGUI, KC_LALT, KC_LANG2, KC_SPC,  KC_SPC, KC_SPC, KC_SPC, KC_LANG1, KC_RALT,  KC_RGUI, _______
  ),

  /* Fn */
  [_FN] = LAYOUT_giabarinaix2(
    CSYSTEM, CNTBASC, CSYSALL, CHRTONE, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, RGB_TOG,
      DF_QWER, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
        XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, TGLMICH,
          XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
            XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,

    CSYSTEM, CNTBASC, CSYSALL, CHRTONE, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, RGB_TOG,
      DF_QWER, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
        XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, VERSION, TGLMICH,
          XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
            XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,  _______
  )
};

#if defined(ENCODER_MAP_ENABLE)
const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][2] = {
    [_C_SYSTEM_BASE]        = { ENCODER_CCW_CW(KC_VOLD, KC_VOLU) },
    [_C_SYSTEM_BASS2ROW]    = { ENCODER_CCW_CW(_______, _______) },
    [_C_SYSTEM_ENTIRELY]    = { ENCODER_CCW_CW(_______, _______) },
    [_CHROMATONE]           = { ENCODER_CCW_CW(_______, _______) },
    [_QWERTY]               = { ENCODER_CCW_CW(_______, _______) },
    [_FN]                   = { ENCODER_CCW_CW(_______, _______) },
};
#endif

#ifdef RGBLIGHT_ENABLE

// Light up fn layer keys
const rgblight_segment_t PROGMEM my_fn_layer[] = RGBLIGHT_LAYER_SEGMENTS(                           //  left keyboard
                                                                         {0,   4, HSV_ORANGE},      //  MIDI layouts
                                                                         {11,  1, HSV_RED},         //  RGB_TOG
                                                                         {12,  1, HSV_WHITE},       //  DF_QWER
                                                                         {35,  1, HSV_TEAL},        //  TGLMICH

                                                                                                    //  right keyboard
                                                                         {60,  4, HSV_ORANGE},      //  MIDI layouts
                                                                         {71 , 1, HSV_RED},         //  RGB_TOG
                                                                         {72,  1, HSV_WHITE},       //  DF_QWER
                                                                         {83,  1, HSV_TEAL}         //  TGLMICH
);


// Now define the array of layers. Later layers take precedence
const rgblight_segment_t* const PROGMEM my_rgb_layers[] = RGBLIGHT_LAYERS_LIST(my_fn_layer);

layer_state_t layer_state_set_user(layer_state_t state) {
    // Both layers will light up if both kb layers are active
    rgblight_set_layer_state(0, layer_state_cmp(state, _FN));
    return state;
};

#endif  //  RGBLIGHT_ENABLE
void keyboard_post_init_user(void) {
    //  Set otave to MI_OCT_0
    midi_config.octave = MI_OCT_0 - MIDI_OCTAVE_MIN;

    // avoid using 127 since it is used as a special number in some sound sources.
    midi_config.velocity = MIDI_INITIAL_VELOCITY;

    for (uint8_t i = 0; i < MY_CHORD_COUNT; i++) {
        chord_status[i] = MIDI_INVALID_NOTE;
    }

#ifdef RGBLIGHT_ENABLE

    rgblight_layers = my_rgb_layers;

    // Reset LED off
    rgblight_sethsv(HSV_BLACK);
#    if defined(RGBLIGHT_EFFECT_KNIGHT) || defined(RGBLIGHT_EFFECT_TWINKLE)
    rgblight_sethsv(30, 50, 40);
#        ifdef RGBLIGHT_EFFECT_KNIGHT
    rgblight_mode(RGBLIGHT_MODE_KNIGHT);
#        elif defined(RGBLIGHT_EFFECT_TWINKLE)
    rgblight_mode(RGBLIGHT_MODE_TWINKLE+3);
#        endif
#    endif
#endif  // RGBLIGHT_ENABLE
};

void toggle_MIDI_channel_separation(void) {
    if (midi_chord_ch > 0) {
        midi_chord_ch = 0;
        midi_bass_ch  = 0;
    } else {
        midi_chord_ch = 1;
        midi_bass_ch  = 2;
    }
}

#ifdef RGBLIGHT_ENABLE
void switch_keylight_color4bass(keyrecord_t *record, uint8_t keylocation){
    switch (biton32(default_layer_state)) {
        case _C_SYSTEM_BASE:
            keylight_manager(record, HSV_GREEN, keylocation);
            break;
        case _C_SYSTEM_BASS2ROW:
            keylight_manager(record, HSV_YELLOW, keylocation);
            break;
    }
}
void switch_keylight_color4chords(keyrecord_t *record, uint8_t keylocation){
    switch (biton32(default_layer_state)) {
        case _C_SYSTEM_BASE:
            keylight_manager(record, HSV_SPRINGGREEN, keylocation);
            break;
        case _C_SYSTEM_BASS2ROW:
            keylight_manager(record, HSV_GOLDENROD, keylocation);
            break;
    }
}
#endif  // RGBLIGHT_ENABLE

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    uint16_t root_note = MIDI_INVALID_NOTE;  // Starting value for the root note of each chord

    #ifdef RGBLIGHT_ENABLE
        /* prepare for turning on LEDs when keys are pressed. */
        uint8_t r            = record->event.key.row;
        uint8_t c            = record->event.key.col;
        uint8_t keylocation  = pgm_read_byte(&convert_key_to_led[MATRIX_COLS * r + c]);
    #endif  // RGBLIGHT_ENABLE

    uint8_t chord        = keycode - MY_CHORD_MIN;

    switch (keycode) {
        case VERSION: // Output firmware info.
            if (record->event.pressed) {
                SEND_STRING(QMK_KEYBOARD ":" QMK_KEYMAP " @ " QMK_VERSION " | " QMK_BUILDDATE);
            }
            break;

        //  set default layer and save it to EEPROM when MIDI key layers are selected.
        case CSYSTEM:
            if (record->event.pressed) {
                set_single_persistent_default_layer(_C_SYSTEM_BASE);
            }
            break;

        case CNTBASC:
            if (record->event.pressed) {
                set_single_persistent_default_layer(_C_SYSTEM_BASS2ROW);
            }
            break;

        case CSYSALL:
            if (record->event.pressed) {
                set_single_persistent_default_layer(_C_SYSTEM_ENTIRELY);
            }
            break;

        case CHRTONE:
            if (record->event.pressed) {
                set_single_persistent_default_layer(_CHROMATONE);
            }
            break;

        case TGLMICH:
            if (record->event.pressed) {
                toggle_MIDI_channel_separation();
            };
            break;


        // MIDI Chord Keycodes, on the left side.
        case MI_CH_Cr ... MI_CH_Br:  // Root Notes
            root_note = keycode - MI_CH_Cr + MI_C_1;
            my_process_midi4Bass(midi_bass_ch, record, chord_status, chord, root_note, false);
#ifdef RGBLIGHT_ENABLE
            switch_keylight_color4bass(record, keylocation);
#endif
            break;
        case MI_CH_C ... MI_CH_B:  // Major Chords
            root_note = keycode - MI_CH_C + MI_C_2;
            // Root, Major Third, and Fifth Notes
            my_process_midi4TriadChords(midi_chord_ch, record, chord_status, chord, root_note, 0, 4, 7);
#ifdef RGBLIGHT_ENABLE
            switch_keylight_color4chords(record, keylocation);
#endif
            break;
        case MI_CH_Cm ... MI_CH_Bm:  // Minor Chord
            root_note = keycode - MI_CH_Cm + MI_C_2;
            // Root, Minor Third, and Fifth Notes
            my_process_midi4TriadChords(midi_chord_ch, record, chord_status, chord, root_note, 0, 3, 7);
#ifdef RGBLIGHT_ENABLE
            switch_keylight_color4chords(record, keylocation);
#endif
            break;
        case MI_CH_CDom7 ... MI_CH_BDom7:  // Dominant 7th Chord
            root_note = keycode - MI_CH_CDom7 + MI_C_2;
            // Major Third, Major Fifth, and Minor Seventh Notes
            my_process_midi4TriadChords(midi_chord_ch, record, chord_status, chord, root_note, 4, 7, 10);
#ifdef RGBLIGHT_ENABLE
            switch_keylight_color4chords(record, keylocation);
#endif
            break;
        case MI_CH_CDim7 ... MI_CH_BDim7:                // Diminished 7th Chord
            root_note = keycode - MI_CH_CDim7 + MI_C_2;
            // Root, Minor Third, and Diminished 5th Note
            my_process_midi4TriadChords(midi_chord_ch, record, chord_status, chord, root_note, 0, 3, 6);
#ifdef RGBLIGHT_ENABLE
            switch_keylight_color4chords(record, keylocation);
#endif
            break;

#ifdef RGBLIGHT_ENABLE
        case KC_A ... KC_RGUI:                // for QWERTY
        case KC_GESC:
            keylight_manager(record, HSV_GOLDENROD, keylocation);
            break;
#endif
            // Keycodes on the right side.
#ifdef RGBLIGHT_ENABLE
        case MIDI_TONE_MIN ... MIDI_TONE_MAX:  // notes on the right side.
            keylight_manager(record, HSV_GOLDENROD, keylocation);
            break;
        // case KC_MUTE:
        case FN_MUTE:
            keylight_manager(record, HSV_GOLDENROD, keylocation);
            break;
#endif
    }
    return true;
}