/* Copyright 2023 Colin Lam (Ploopy Corporation)
 * Copyright 2020 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
 * Copyright 2019 Sunjun Kim
 *
 * 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 {
  DEFAULT = 0,
  FN1,
  FN2
};

enum {
  KC_TOG_HOLD = QK_USER
};

// if the layer hold button is released before this timeout, it
// becomes a toggle.
const uint32_t layer_hold_timeout = 200;

// top left left, top left, top right, top right right, bottom left, bottom right
const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [DEFAULT] = LAYOUT(MS_BTN4, MS_BTN5, MS_BTN3, MS_BTN2, MS_BTN1, KC_TOG_HOLD),
  [FN1]     = LAYOUT(KC_TRNS, QK_BOOT, KC_MPLY, KC_TRNS, KC_TRNS, KC_TRNS),
  [FN2]     = LAYOUT(KC_BRID, QK_BOOT, KC_MPLY, KC_BRIU, KC_MCTL, KC_TRNS),
};

// probably shouldn't be doing this, but beats trying to keep track of
// it myself and getting out of sync.
extern bool is_drag_scroll;

layer_state_t layer_state_set_user(layer_state_t state) {
  if (IS_LAYER_ON_STATE(state, FN1)) {
    is_drag_scroll = true;
  } else {
    is_drag_scroll = false;
  }
  return state;
}

/*
 * use deferred execution to turn on a layer aften n ms of the key
 * being held down.
 */
/*
uinst32_t callback(uint32_t trigger_time, void *cb_arg) {
  return 0;
}
token = defer_exec(layer_hold_timeout, callback, NULL);
cancel_deferred_exec(token);
*/

static bool fn1_up = false;
static uint16_t fn1_release_timer = 0;
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
  case KC_TOG_HOLD:
    if (record->event.pressed) {
      fn1_release_timer = timer_read();
      layer_off(FN1);
      layer_on(FN2);
    } else {
      layer_off(FN2);

      if (timer_elapsed(fn1_release_timer) < layer_hold_timeout) {
        fn1_up = !fn1_up;
        if (fn1_up) {
          layer_on(FN1);
        } else {
          layer_off(FN1);
        }
      }

    }
    break;
  }
  return true;
}