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/* Copyright 2017 WoodKeys
 *
 * 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

enum layer_names {
    _NUMLOCK,
    _NAV,
    _ALT,
    _ADJUST
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    [_NUMLOCK] = LAYOUT_ortho_5x4( /* Base */
        KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
        KC_P7,   KC_P8,   KC_P9,   KC_PPLS,
        KC_P4,   KC_P5,   KC_P6,   KC_PEQL,
        KC_P1,   KC_P2,   KC_P3,   KC_COMM,
        KC_LALT, KC_P0,   KC_PDOT, KC_PENT
    ),
    [_NAV] = LAYOUT_ortho_5x4( /* Base */
        _______, _______, _______, _______,
        KC_HOME, KC_UP,   KC_PGUP, _______,
        KC_LEFT, XXXXXXX, KC_RGHT, _______,
        KC_END,  KC_DOWN, KC_PGDN, _______,
        _______, KC_INS,  KC_DEL,  _______
    ),
    [_ALT] = LAYOUT_ortho_5x4( /* Base */
        _______, KC_MUTE, KC_VOLD, KC_VOLU,
        _______, _______, _______, _______,
        _______, _______, _______, _______,
        _______, _______, _______, _______,
        _______, _______, _______, _______
    ),
    [_ADJUST] = LAYOUT_ortho_5x4( /* Base */
        _______, KC_A,    _______, RESET,
        _______, _______, _______, _______,
        _______, _______, _______, _______,
        _______, _______, _______, _______,
        _______, _______, _______, _______
    )
};

static bool numlock_down = false;

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    switch (keycode) {
        case KC_NLCK:
            if (record->event.pressed) {
                numlock_down = true;
                if (IS_LAYER_ON(_ALT)) {
                    layer_on(_ADJUST);
                }
            } else {
                if(!IS_LAYER_ON(_ADJUST)) {
                    if (!IS_LAYER_ON(_NAV)) {
                        numlock_led_off();
                        layer_on(_NAV);
                    } else {
                        numlock_led_on();
                        layer_off(_NAV);
                    }
                } else {
                    layer_off(_ADJUST);
                }
                numlock_down = false;
            }
            return false;
        case KC_LALT:
            if (record->event.pressed) {
                if (numlock_down) {
                    layer_on(_ADJUST);
                } else {
                    layer_on(_ALT);
                }
            } else {
                if(IS_LAYER_ON(_ADJUST)) {
                    layer_off(_ADJUST);
                } else {
                    layer_off(_ALT);
                }
            }
            // Allow normal processing of ALT
            return false;
    }
    return true;
}