/* Copyright 2021 Don Kjer and Tyler Tidman
 *
 * 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

// Layer shorthand
enum _layer {
    _WBL,
    _WFL,
    _WSL,
    _MBL,
    _MFL,
    _MSL
};

#ifndef DEFAULT_LAYOUT
# define DEFAULT_LAYOUT _WBL // Change to _MBL to boot into Mac layout.
#endif
#ifndef ALT_LAYOUT
# define ALT_LAYOUT     _MBL // Layout to display 'MR' led when active.
#endif

static bool win_key_locked = false;
static bool mac_media_locked = false;
static bool win_appkey_pressed = false;
static bool mac_fnkey_pressed = false;


// Defines the keycodes used by our macros in process_record_user
enum custom_keycodes {
    KC_TGUI = SAFE_RANGE,  // Toggle between GUI Lock or Unlock (Windows)
    KC_TMED,               // Toggle between Fx keys or Media keys (Mac)
    KC_WFN,                // Windows function key
    KC_MFN,                // Mac function key
    MO_WSL,                // Windows system key
    MO_MSL,                // Mac system key
    DF_W2MBL,              // Change layout from Windows to Mac
    DF_M2WBL               // Change layout from Mac to Windows
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* Keymap _WBL: Windows Base Layer (Default Layer)
   * ┌───┐   ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┐
   * │Esc│   │F1 │F2 │F3 │F4 │ │F5 │F6 │F7 │F8 │ │F9 │F10│F11│F12│ │PSc│Slk│Pse│
   * └───┘   └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┘
   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐ ┌───┬───┬───┐ ┌───┬───┬───┬───┐
   * │ ` │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ 9 │ 0 │ - │ = │ Backsp│ │Ins│Hom│PgU│ │Num│ / │ * │ - │
   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤ ├───┼───┼───┤ ├───┼───┼───┼───┤
   * │ Tab │ Q │ W │ E │ R │ T │ Y │ U │ I │ O │ P │ [ │ ] │  \  │ │Del│End│PgD│ │ 7 │ 8 │ 9 │   │
   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬┈┈┈┈┤ └───┴───┴───┘ ├───┼───┼───┤ + │
   * │ Caps │ A │ S │ D │ F │ G │ H │ J │ K │ L │ ; │ ' │ # │Entr│               │ 4 │ 5 │ 6 │   │
   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤     ┌───┐     ├───┼───┼───┼───┤
   * │Shft│ \ │ Z │ X │ C │ V │ B │ N │ M │ , │ . │ / │    Shift │     │ ↑ │     │ 1 │ 2 │ 3 │   │
   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤ ┌───┼───┼───┐ ├───┴───┼───┤Ent│
   * │Ctrl│GUI │Alt │                        │ Alt│Func│ App│Ctrl│ │ ← │ ↓ │ → │ │   0   │ . │   │
   * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘ └───┴───┴───┘ └───────┴───┴───┘
   */
    [_WBL] = LAYOUT_all( /* Windows Base Layer */
        KC_ESC,           KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,     KC_PSCR, KC_SLCK, KC_PAUS,
        KC_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,  KC_BSPC,    KC_INS,  KC_HOME, KC_PGUP,    KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
        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,    KC_DEL,  KC_END,  KC_PGDN,    KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,                                   KC_P4,   KC_P5,   KC_P6,
        KC_LSFT, KC_NUBS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT,             KC_UP,               KC_P1,   KC_P2,   KC_P3,   KC_PENT,
        KC_LCTL, KC_LGUI, KC_LALT,                            KC_SPC,                             KC_RALT, KC_WFN,  KC_APP,  KC_RCTL,    KC_LEFT, KC_DOWN, KC_RGHT,    KC_P0,            KC_PDOT
    ),
  /* Keymap _WFL: Windows Function Layer
   * ┌───┐   ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┐
   * │   │   │Ply│Stp│Prv│Nxt│ │Mut│Vo+│Vo-│   │ │   │   │   │   │ │   │   │Mut│
   * └───┘   └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┘
   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐ ┌───┬───┬───┐ ┌───┬───┬───┬───┐
   * │   │   │   │   │   │   │   │   │   │   │   │   │   │       │ │   │   │Vo+│ │   │   │   │   │
   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤ ├───┼───┼───┤ ├───┼───┼───┼───┤
   * │     │   │   │   │   │   │   │   │   │   │   │   │   │     │ │   │   │Vo-│ │   │   │   │   │
   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬┈┈┈┈┤ └───┴───┴───┘ ├───┼───┼───┤   │
   * │      │   │   │   │   │   │   │   │   │   │   │   │   │    │               │   │   │   │   │
   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤     ┌───┐     ├───┼───┼───┼───┤
   * │    │   │   │   │   │   │   │   │   │   │   │   │          │     │   │     │   │   │   │   │
   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤ ┌───┼───┼───┐ ├───┴───┼───┤   │
   * │    │Lock│    │                        │    │Func│ Sys│    │ │   │   │   │ │       │   │   │
   * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘ └───┴───┴───┘ └───────┴───┴───┘
   */
  [_WFL] = LAYOUT_all( /* Windows Function Layer */
        _______,          KC_MPLY, KC_MSTP, KC_MPRV, KC_MNXT, KC_MUTE, KC_VOLD, KC_VOLU, _______, _______, _______, _______, _______,    _______, _______, KC_MUTE,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,    _______, _______, KC_VOLU,    _______, _______, _______, _______,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,    _______, _______, KC_VOLD,    _______, _______, _______, _______,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,                                  _______, _______, _______,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,             _______,             _______, _______, _______, _______,
        _______, KC_TGUI, _______,                            _______,                            _______, _______, MO_WSL,  _______,    _______, _______, _______,    _______,          _______
    ),
  /* Keymap _WSL: Windows System Layer
   * ┌───┐   ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┐
   * │Rst│   │Slp│   │   │Pwr│ │   │   │   │   │ │   │   │   │MAC│ │   │   │   │
   * └───┘   └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┘
   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐ ┌───┬───┬───┐ ┌───┬───┬───┬───┐
   * │   │   │   │   │   │   │   │   │   │   │   │   │   │       │ │   │   │   │ │   │   │   │   │
   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤ ├───┼───┼───┤ ├───┼───┼───┼───┤
   * │     │   │   │   │   │   │   │   │   │   │   │   │   │     │ │   │   │   │ │   │   │   │   │
   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬┈┈┈┈┤ └───┴───┴───┘ ├───┼───┼───┤   │
   * │      │   │   │DBG│   │   │   │   │   │   │   │   │   │    │               │   │   │   │   │
   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤     ┌───┐     ├───┼───┼───┼───┤
   * │    │   │   │   │   │   │   │   │   │   │   │   │          │     │   │     │   │   │   │   │
   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤ ┌───┼───┼───┐ ├───┴───┼───┤   │
   * │    │    │    │                        │    │    │    │    │ │   │   │   │ │       │   │   │
   * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘ └───┴───┴───┘ └───────┴───┴───┘
   */
    [_WSL] = LAYOUT_all( /* Windows Second / System Layer */
        RESET,            KC_SLEP, XXXXXXX, XXXXXXX, KC_PWR,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, DF_W2MBL,   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, DEBUG,   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
    ),

  /* Keymap _MBL: Mac Base Layer (Alternate Layout)
   * ┌───┐   ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┐
   * │Esc│   │F1 │F2 │F3 │F4 │ │F5 │F6 │F7 │F8 │ │F9 │F10│F11│F12│ │F13│F14│F15│
   * └───┘   └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┘
   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐ ┌───┬───┬───┐ ┌───┬───┬───┬───┐
   * │ ` │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ 9 │ 0 │ - │ = │ Backsp│ │Ins│Hom│PgU│ │Num│ / │ * │ - │
   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤ ├───┼───┼───┤ ├───┼───┼───┼───┤
   * │ Tab │ Q │ W │ E │ R │ T │ Y │ U │ I │ O │ P │ [ │ ] │  \  │ │Del│End│PgD│ │ 7 │ 8 │ 9 │   │
   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬┈┈┈┈┤ └───┴───┴───┘ ├───┼───┼───┤ + │
   * │ Caps │ A │ S │ D │ F │ G │ H │ J │ K │ L │ ; │ ' │ # │Entr│               │ 4 │ 5 │ 6 │   │
   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤     ┌───┐     ├───┼───┼───┼───┤
   * │Shft│ \ │ Z │ X │ C │ V │ B │ N │ M │ , │ . │ / │    Shift │     │ ↑ │     │ 1 │ 2 │ 3 │   │
   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤ ┌───┼───┼───┐ ├───┴───┼───┤Ent│
   * │Ctrl│Alt │GUI │                        │ GUI│ Alt│Func│Ctrl│ │ ← │ ↓ │ → │ │   0   │ . │   │
   * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘ └───┴───┴───┘ └───────┴───┴───┘
   */
    [_MBL] = LAYOUT_all( /* Mac Base Layer */
        KC_ESC,           KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,     KC_F13,  KC_F14,  KC_F15,
        KC_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,  KC_BSPC,    KC_INS,  KC_HOME, KC_PGUP,    KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
        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,    KC_DEL,  KC_END,  KC_PGDN,    KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,                                   KC_P4,   KC_P5,   KC_P6,
        KC_LSFT, KC_NUBS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH,          KC_RSFT,             KC_UP,               KC_P1,   KC_P2,   KC_P3,   KC_PENT,
        KC_LCTL, KC_LALT, KC_LGUI,                            KC_SPC,                             KC_RGUI, KC_RALT, KC_MFN,  KC_RCTL,    KC_LEFT, KC_DOWN, KC_RGHT,    KC_P0,            KC_PDOT
    ),
  /* Keymap _MFL: Mac Function Layer
   * ┌───┐   ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┐
   * │   │   │Br-│Br+│   │   │ │   │   │Prv│Ply│ │Nxt│Mut│Vo-│Vo+│ │TMd│   │Mut│
   * └───┘   └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┘
   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐ ┌───┬───┬───┐ ┌───┬───┬───┬───┐
   * │   │   │   │   │   │   │   │   │   │   │   │   │   │       │ │   │   │Vo+│ │   │   │   │   │
   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤ ├───┼───┼───┤ ├───┼───┼───┼───┤
   * │     │   │   │   │   │   │   │   │   │   │   │   │   │     │ │   │   │Vo-│ │   │   │   │   │
   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬┈┈┈┈┤ └───┴───┴───┘ ├───┼───┼───┤   │
   * │      │   │   │   │   │   │   │   │   │   │   │   │   │    │               │   │   │   │   │
   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤     ┌───┐     ├───┼───┼───┼───┤
   * │    │   │   │   │   │   │   │   │   │   │   │   │          │     │   │     │   │   │   │   │
   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤ ┌───┼───┼───┐ ├───┴───┼───┤   │
   * │    │    │    │                        │    │ Sys│Func│    │ │   │   │   │ │       │   │   │
   * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘ └───┴───┴───┘ └───────┴───┴───┘
   */
  [_MFL] = LAYOUT_all( /* Mac Function Layer */
        _______,          KC_BRID, KC_BRIU, _______, _______, _______, _______, KC_MPRV, KC_MPLY, KC_MNXT, KC_MUTE, KC_VOLD, KC_VOLU,    KC_TMED, _______, KC_MUTE,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,    _______, _______, KC_VOLU,     _______, _______, _______, _______,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,    _______, _______, KC_VOLD,     _______, _______, _______, _______,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,                                   _______, _______, _______,
        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,             _______,              _______, _______, _______, _______,
        _______, _______, _______,                            _______,                            _______, MO_MSL,  _______, _______,    _______, _______, _______,     _______,          _______
    ),
  /* Keymap _MSL: Mac System Layer
   * ┌───┐   ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┬───┐ ┌───┬───┬───┐
   * │Rst│   │   │   │   │Slp│ │   │   │   │   │ │   │   │   │WIN│ │   │   │   │
   * └───┘   └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┴───┘ └───┴───┴───┘
   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐ ┌───┬───┬───┐ ┌───┬───┬───┬───┐
   * │   │   │   │   │   │   │   │   │   │   │   │   │   │       │ │   │   │   │ │   │   │   │   │
   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤ ├───┼───┼───┤ ├───┼───┼───┼───┤
   * │     │   │   │   │   │   │   │   │   │   │   │   │   │     │ │   │   │   │ │   │   │   │   │
   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬┈┈┈┈┤ └───┴───┴───┘ ├───┼───┼───┤   │
   * │      │   │   │DBG│   │   │   │   │   │   │   │   │   │    │               │   │   │   │   │
   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤     ┌───┐     ├───┼───┼───┼───┤
   * │    │   │   │   │   │   │   │   │   │   │   │   │          │     │   │     │   │   │   │   │
   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤ ┌───┼───┼───┐ ├───┴───┼───┤   │
   * │    │    │    │                        │    │ Sys│Func│    │ │   │   │   │ │       │   │   │
   * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘ └───┴───┴───┘ └───────┴───┴───┘
   */
    [_MSL] = LAYOUT_all( /* Mac Second / System Layer */
        RESET,            XXXXXXX, XXXXXXX, XXXXXXX, KC_SLEP, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, DF_M2WBL,   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, DEBUG,   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
    )
};

void unlock_win_key(void) {
    win_key_locked = false;
    mac_media_locked = false;
    writePinHigh(LED_WIN_LOCK_PIN);
}

void toggle_lock_win_key(void) {
    win_key_locked = !win_key_locked;
    writePin(LED_WIN_LOCK_PIN, !win_key_locked);
}

void toggle_lock_media_key(void) {
    mac_media_locked = !mac_media_locked;
    writePin(LED_WIN_LOCK_PIN, !mac_media_locked);
}

#ifdef CONSOLE_ENABLE
void dprint_global_layers(void) {
    dprint("Global Layers:");
    if (IS_LAYER_ON(_WFL)) { dprint(" _WFL"); }
    if (IS_LAYER_ON(_WSL)) { dprint(" _WSL"); }
    if (IS_LAYER_ON(_MFL)) { dprint(" _MFL"); }
    if (IS_LAYER_ON(_MSL)) { dprint(" _MSL"); }
    dprintf("\n");
}

void dprint_layers(layer_state_t state) {
    dprint("Layers:");
    if (IS_LAYER_ON_STATE(state, _WFL)) { dprint(" _WFL"); }
    if (IS_LAYER_ON_STATE(state, _WSL)) { dprint(" _WSL"); }
    if (IS_LAYER_ON_STATE(state, _MFL)) { dprint(" _MFL"); }
    if (IS_LAYER_ON_STATE(state, _MSL)) { dprint(" _MSL"); }
    dprintf("\n");
}
#endif

layer_state_t default_layer_state_set_user(layer_state_t state) {
#ifdef CONSOLE_ENABLE
    dprintf("default_layer_state_set_user: 0x%x\n", state);
    dprint_global_layers();
#endif
    // Disable windows key lock on default layer transition.
    unlock_win_key();
    win_appkey_pressed = false;
    mac_fnkey_pressed = false;
    writePin(LED_MR_LOCK_PIN, !IS_LAYER_ON_STATE(state, ALT_LAYOUT));
    return state;
}

layer_state_t layer_state_set_user(layer_state_t state) {
#ifdef CONSOLE_ENABLE
    dprintf("layer_state_set_user: 0x%x\n", state);
    dprint_layers(state);
#endif
    return state;
}

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    switch (keycode) {
        case KC_TGUI:
            if (!record->event.pressed) {
                // Toggle GUI lock on key release
                toggle_lock_win_key();
            }
            break;
        case KC_TMED:
            // Only trigger when Fn key is also held down, to avoid accidental unlock.
            if (!mac_fnkey_pressed) { return false; }
            if (!record->event.pressed) {
                // Toggle Media Lock on key release
                toggle_lock_media_key();
            }
            break;
        case KC_LGUI:
            if (win_key_locked) { return false; }
            break;
        case KC_WFN:
            // Like MO(_WFL), but also enables _WSL if KC_APP is already pressed down.
            if (record->event.pressed) {
                layer_on(_WFL);
                if (win_appkey_pressed) {
                    // Also enable Secondary layer if App key is being held down.
                    win_appkey_pressed = false;
                    layer_on(_WSL);
                }
            } else {
                if (IS_LAYER_ON(_WFL)) { layer_off(_WFL); }
                if (IS_LAYER_ON(_MSL)) { layer_off(_MSL); }
            }
            break;
        case KC_APP:
            if (record->event.pressed) {
                // Don't actually press down the app menu key
                win_appkey_pressed = true;
            } else {
                if (IS_LAYER_ON(_WSL)) { layer_off(_WSL); }
                if (IS_LAYER_ON(_MFL)) { layer_off(_MFL); }
                if (win_appkey_pressed) {
                    win_appkey_pressed = false;
                    // Tap the KC_APP key on key release.
                    tap_code(KC_APP);
                }
            }
            return false;
            break;
        case KC_MFN:
            // Mac Fn key.  Emit Fn keycode, and also transition layers similar to KC_WFN.
            if (record->event.pressed) {
                mac_fnkey_pressed = true;
                layer_on(_MFL);
                // Also enable Secondary layer if Right-Alt key is being held down.
                if (get_mods() & MOD_BIT(KC_RALT)) {
                    layer_on(_MSL);
                }
            } else {
                mac_fnkey_pressed = false;
                if (!mac_media_locked) {
                    if (IS_LAYER_ON(_MFL)) { layer_off(_MFL); }
                    if (IS_LAYER_ON(_WSL)) { layer_off(_WSL); }
                }
            }
            break;
        case KC_RALT:
            // Disable MSL/WFL layer on key-up.
            if (!record->event.pressed) {
                if (IS_LAYER_ON(_MSL)) { layer_off(_MSL); }
                if (IS_LAYER_ON(_WFL)) { layer_off(_WFL); }
            }
            break;
        case MO_WSL:
            if (record->event.pressed) {
                layer_on(_WSL);
            } else {
                if (IS_LAYER_ON(_WSL)) { layer_off(_WSL); }
                if (IS_LAYER_ON(_MFL)) { layer_off(_MFL); }
            }
            break;
        case MO_MSL:
            if (record->event.pressed) {
                layer_on(_MSL);
            } else {
                if (IS_LAYER_ON(_MSL)) { layer_off(_MSL); }
                if (IS_LAYER_ON(_WFL)) { layer_off(_WFL); }
            }
            break;
        case DF_W2MBL:
            if (!record->event.pressed) {
                // Switch base layer, but preserve first/secondary layers.
                default_layer_set(1UL<<_MBL);
                layer_state_set(1UL<<_MFL | 1UL<<_MSL);
            }
            break;
        case DF_M2WBL:
            if (!record->event.pressed) {
                // Switch base layer, but preserve first/secondary layers.
                default_layer_set(1UL<<_WBL);
                layer_state_set(1UL<<_WFL | 1UL<<_WSL);
            }
            break;
        case RESET:
            if (record->event.pressed) {
                // Flash LEDs to indicate bootloader mode is enabled.
                on_all_leds();
            }
            break;
    }
    return true;
}

void keyboard_post_init_user(void) {
    default_layer_set(1UL<<DEFAULT_LAYOUT);
}