// Copyright 2024 Patrick Mathern (@Patrickemm)
// SPDX-License-Identifier: GPL-2.0-or-later

#include QMK_KEYBOARD_H

// Define the keycode, `QK_USER` avoids collisions with existing keycodes
enum keycodes {
  KC_CYCLE_LAYERS = QK_USER,
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

    [0] = LAYOUT(
        KC_0, KC_CYCLE_LAYERS,
        KC_1, KC_2, KC_3, KC_4,
        KC_5, KC_6, KC_7, KC_8
    ),
    [1] = LAYOUT(
        KC_9, KC_CYCLE_LAYERS,
        KC_A, KC_B, KC_C, KC_D,
        KC_E, KC_F, KC_G, KC_H
    ),
    [2] = LAYOUT(
        KC_I, KC_CYCLE_LAYERS,
        KC_J, KC_K, KC_L, KC_M,
        KC_N, KC_O, KC_P, KC_Q
    ),
    [3] = LAYOUT(
        KC_R, KC_CYCLE_LAYERS,
        KC_S, KC_T, KC_U, KC_V,
        KC_W, KC_X, KC_Y, KC_Z
    ),
    [4] = LAYOUT(
        KC_TRNS, KC_CYCLE_LAYERS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
    ),
    [5] = LAYOUT(
        KC_TRNS, KC_CYCLE_LAYERS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
    ),
    [6] = LAYOUT(
        KC_TRNS, KC_CYCLE_LAYERS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
    ),
    [7] = LAYOUT(
        KC_TRNS, KC_CYCLE_LAYERS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
    )
};

// 1st layer on the cycle
#define LAYER_CYCLE_START 0
// Last layer on the cycle
#define LAYER_CYCLE_END 7

// Add the behaviour of this new keycode
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
    case KC_CYCLE_LAYERS:
      // Our logic will happen on presses, nothing is done on releases
      if (!record->event.pressed) { 
        // We've already handled the keycode (doing nothing), let QMK know so no further code is run unnecessarily
        return false;
      }

      uint8_t current_layer = get_highest_layer(layer_state);

      // Check if we are within the range, if not quit
      if (current_layer > LAYER_CYCLE_END || current_layer < LAYER_CYCLE_START) {
        return false;
      }

      uint8_t next_layer = current_layer + 1;
      if (next_layer > LAYER_CYCLE_END) {
          next_layer = LAYER_CYCLE_START;
      }
      layer_move(next_layer);
      return false;

    // Process other keycodes normally
    default:
      return true;
  }
}

#if defined(ENCODER_MAP_ENABLE)
const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS] = {
    [0] = { ENCODER_CCW_CW(KC_MS_WH_UP, KC_MS_WH_DOWN)  },
    [1] = { ENCODER_CCW_CW(_______, _______) },
    [2] = { ENCODER_CCW_CW(_______, _______) },
    [3] = { ENCODER_CCW_CW(_______, _______) },
    [4] = { ENCODER_CCW_CW(_______, _______) },
    [5] = { ENCODER_CCW_CW(_______, _______) },
    [6] = { ENCODER_CCW_CW(_______, _______) },
    [7] = { ENCODER_CCW_CW(_______, _______) }
};
#endif