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/* Copyright 2022 Christoph Cullmann
 *
 * 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/>.
 */

// our layers
enum my_layers {
  _BASE,
  _NUM,
  _NAV,
  _SYM,
  _FN,
  _MAGIC
};

// our keymap
const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

[_BASE] = LAYOUT(
    KC_W,         KC_L,         KC_Y,         KC_P,         KC_B,             KC_Z,           KC_F,         OSL(_MAGIC),  KC_U,         KC_QUOT,
    RALT_T(KC_C), LALT_T(KC_R), LCTL_T(KC_S), LSFT_T(KC_T), KC_G,             KC_M,           RSFT_T(KC_N), RCTL_T(KC_O), LALT_T(KC_I), RALT_T(KC_A),
    KC_Q,         KC_J,         KC_V,         LGUI_T(KC_D), KC_K,             KC_X,           RGUI_T(KC_H), KC_SLSH,      KC_COMM,      KC_DOT,
                                              MO(_SYM),     LT(_NUM, KC_SPC), LT(_NAV, KC_E), MO(_FN)
),

[_NUM] = LAYOUT(
    TO(_BASE),    C(KC_X),      C(KC_C),      C(KC_V),      XXXXXXX,          KC_LBRC,        KC_7,         KC_8,         KC_9,         KC_RBRC,
    KC_RALT,      KC_LALT,      KC_LCTL,      KC_LSFT,      XXXXXXX,          KC_EQL,         KC_4,         KC_5,         KC_6,         KC_SCLN,
    XXXXXXX,      XXXXXXX,      XXXXXXX,      KC_LGUI,      XXXXXXX,          KC_BSLS,        KC_1,         KC_2,         KC_3,         KC_GRV,
                                              XXXXXXX,      XXXXXXX,          KC_MINS,        KC_0
),

[_NAV] = LAYOUT(
    XXXXXXX,      KC_PGUP,      KC_UP,        KC_PGDN,      XXXXXXX,          QK_BOOT,        XXXXXXX,      XXXXXXX,      XXXXXXX,      TO(_BASE),
    KC_HOME,      KC_LEFT,      KC_DOWN,      KC_RGHT,      KC_END,           XXXXXXX,        KC_RSFT,      KC_RCTL,      KC_LALT,      KC_RALT,
    XXXXXXX,      XXXXXXX,      XXXXXXX,      XXXXXXX,      XXXXXXX,          XXXXXXX,        KC_RGUI,      XXXXXXX,      XXXXXXX,      XXXXXXX,
                                              KC_TAB,       KC_ENT,           XXXXXXX,        XXXXXXX
),

[_SYM] = LAYOUT(
    TO(_BASE),    C(KC_X),      C(KC_C),      C(KC_V),      XXXXXXX,          KC_LCBR,        KC_AMPR,      KC_ASTR,      KC_LPRN,      KC_RCBR,
    KC_RALT,      KC_LALT,      KC_LCTL,      KC_LSFT,      XXXXXXX,          KC_PLUS,        KC_DLR,       KC_PERC,      KC_CIRC,      KC_COLN,
    XXXXXXX,      XXXXXXX,      XXXXXXX,      KC_LGUI,      XXXXXXX,          KC_PIPE,        KC_EXLM,      KC_AT,        KC_HASH,      KC_TILD,
                                              XXXXXXX,      XXXXXXX,          KC_UNDS,        KC_RPRN
),

[_FN] = LAYOUT(
    KC_F12,       KC_F7,        KC_F8,        KC_F9,        KC_PSCR,          QK_BOOT,        XXXXXXX,      XXXXXXX,      XXXXXXX,      TO(_BASE),
    KC_F11,       KC_F4,        KC_F5,        KC_F6,        KC_DEL,           XXXXXXX,        KC_RSFT,      KC_RCTL,      KC_LALT,      KC_RALT,
    KC_F10,       KC_F1,        KC_F2,        KC_F3,        KC_INS,           XXXXXXX,        KC_RGUI,      XXXXXXX,      XXXXXXX,      XXXXXXX,
                                              KC_BSPC,      KC_ESC,           XXXXXXX,        XXXXXXX
),

[_MAGIC] = LAYOUT(
    XXXXXXX,      XXXXXXX,      XXXXXXX,      XXXXXXX,      XXXXXXX,          XXXXXXX,        XXXXXXX,      KC_CAPS,      XXXXXXX,      XXXXXXX,
    KC_LBRC,      KC_RBRC,      KC_LPRN,      KC_RPRN,      XXXXXXX,          XXXXXXX,        KC_LCBR,      KC_RCBR,      S(KC_COMMA),  S(KC_DOT),
    TO(_NUM),     TO(_SYM),     XXXXXXX,      XXXXXXX,      XXXXXXX,          XXXXXXX,        XXXXXXX,      XXXXXXX,      TO(_FN),      TO(_NAV),
                                              XXXXXXX,      XXXXXXX,          XXXXXXX,        XXXXXXX
)

};

#include "achordion.h"

uint16_t get_tapping_term(uint16_t keycode, keyrecord_t* record) {
  switch (keycode) {
    // Increase the tapping term a little for alt/algr/win.
    case RALT_T(KC_C):
    case LALT_T(KC_R):
    case LGUI_T(KC_D):
    case RGUI_T(KC_H):
    case LALT_T(KC_I):
    case RALT_T(KC_A):
      return TAPPING_TERM + 50;

    default:
      return TAPPING_TERM;
  }
}

bool process_record_user(uint16_t keycode, keyrecord_t* record) {
  if (!process_achordion(keycode, record)) { return false; }
  return true;
}

void matrix_scan_user(void) {
  achordion_task();
}

// Returns true if `pos` on the left hand of the keyboard, false if right.
static bool on_left_hand(keypos_t pos) {
  // works not really on planck for bottom row, but we handle that differently
  return pos.row < MATRIX_ROWS / 2;
}

bool achordion_chord(uint16_t tap_hold_keycode,
                     keyrecord_t* tap_hold_record,
                     uint16_t other_keycode,
                     keyrecord_t* other_record) {
  // allow that bottom row has no delay
  if (tap_hold_record->event.key.row % (MATRIX_ROWS / 2) >= 3) { return true; }
  if (other_record->event.key.row % (MATRIX_ROWS / 2) >= 3) { return true; }

  // Otherwise, follow the opposite hands rule.
  return on_left_hand(tap_hold_record->event.key) !=
         on_left_hand(other_record->event.key);
}

uint16_t achordion_streak_timeout(uint16_t tap_hold_keycode) {
  if (IS_QK_LAYER_TAP(tap_hold_keycode)) {
    return 0;  // Disable streak detection on layer-tap keys.
  }

  // Otherwise, tap_hold_keycode is a mod-tap key.
  const uint8_t mod = mod_config(QK_MOD_TAP_GET_MODS(tap_hold_keycode));
  if ((mod & (MOD_LSFT | MOD_RSFT)) != 0) {
    return 0;  // Disable for Shift mod-tap keys.
  } else {
    return 100;
  }
}