/* Copyright 2017 Marvin Ramin (@Mauin)
 *
 * 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

// Keymap layers
enum layer_names {
    _BS, // Base Layer
    _FN, // Function Layer
    _SY  // System Layer
};

enum custom_keycodes {
    ESC_GRV = SAFE_RANGE
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* Layer 0: Default Layer
   * ,-----------------------------------------------------------.
   * |Esc|  1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  = |  BSp |
   * |-----------------------------------------------------------|
   * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|    \|
   * |-----------------------------------------------------------|
   * |Funct |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Enter   |
   * |-----------------------------------------------------------|
   * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  .|  /|    Shift |
   * |-----------------------------------------------------------'
   * |  Ctl|Alt|Gui  |         Space         |Gui  |Alt| F2| Ctl |
   * `-----------------------------------------------------------'
   */
  [_BS] = LAYOUT_all(
      ESC_GRV, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  XXXXXXX, KC_BSPC,
      KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS,
      MO(1),   KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,          KC_ENT,
      KC_LSFT, XXXXXXX, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT, XXXXXXX,
      KC_LCTL, KC_LALT, KC_LGUI,                            KC_SPC,                             KC_RGUI, KC_RALT, MO(2),   KC_RCTL
  ),

  /* Layer 1: Function Layer
   * ,-----------------------------------------------------------.
   * |   | F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11| F12|  Del |
   * |-----------------------------------------------------------|
   * |     |Prv|Ply|Nxt|   |   |Pg^|Hme|Up |End|   |Br-|Br+|     |
   * |-----------------------------------------------------------|
   * |Hold  |Mte|Vl-|Vl+|   |   |Pgv|Lft|Dwn|Rgt|   |   |        |
   * |-----------------------------------------------------------|
   * |        |   |   |   |   |   |   |   |   |   |   |          |
   * |-----------------------------------------------------------'
   * |     |   |     |                       |     |   |   |     |
   * `-----------------------------------------------------------'
   */
  [_FN] = LAYOUT_all(
      KC_GRV,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  XXXXXXX, KC_DEL,
      XXXXXXX, KC_MPRV, KC_MPLY, KC_MNXT, XXXXXXX, XXXXXXX, KC_PGUP, KC_HOME, KC_UP,   KC_END,  XXXXXXX, KC_SLCK, KC_PAUS, XXXXXXX,
      KC_TRNS, KC_MUTE, KC_VOLD, KC_VOLU, XXXXXXX, XXXXXXX, KC_PGDN, KC_LEFT, KC_DOWN, KC_RGHT, XXXXXXX, XXXXXXX,          XXXXXXX,
      KC_LSFT, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
      KC_LCTL, KC_LALT, KC_LGUI,                            KC_SPC,                             XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX
  ),

  /* Layer 2: System Layer
   * ,-----------------------------------------------------------.
   * |Reset|   |   |   |   |   |   |   |   |   |   |    |   |    |
   * |-----------------------------------------------------------|
   * |     |   |   |   |   |   |   |   |   |   |   |   |   |     |
   * |-----------------------------------------------------------|
   * |      |   |   |   |   |   |   |   |   |   |   |   |        |
   * |-----------------------------------------------------------|
   * |        |   |   |   |   |   |   |   |   |   |   |          |
   * |-----------------------------------------------------------'
   * |     |   |     |                       |     |   |   |     |
   * `-----------------------------------------------------------'
   */
  [_SY] = LAYOUT_all(
      RESET,   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
      XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
      XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,          XXXXXXX,
      XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
      XXXXXXX, XXXXXXX, XXXXXXX,                            XXXXXXX,                            XXXXXXX, XXXXXXX, KC_TRNS, XXXXXXX
  ),
};

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    uint8_t esc_grv_mask = get_mods() & MOD_BIT(KC_LGUI);
    switch (keycode) {
        case ESC_GRV:
            if (esc_grv_mask) {
                if (record->event.pressed) {
                    register_code16(G(KC_GRV));
                } else {
                    unregister_code16(G(KC_GRV));
                }
            } else {
                if (record->event.pressed) {
                    register_code(KC_ESC);
                } else {
                    unregister_code(KC_ESC);
                }
            }
            break;
    }
    return true;
}