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/*
Copyright 2019 @foostan
Copyright 2020 Drashna Jaelre <@drashna>

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


// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.
enum crkbd_layers {
    _QWERTY,
    _LOWER,
    _RAISE,
    _ADJUST,
};


#define RAISE MO(_RAISE)
#define LOWER MO(_LOWER)
#define CTLTB CTL_T(KC_TAB)
#define GUIEI GUI_T(KC_LANG2)
#define ALTKN ALT_T(KC_LANG1)

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [_QWERTY] = LAYOUT_split_3x6_3(
    KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,     KC_T,                      KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
    CTLTB,   KC_A,    KC_S,    KC_D,    KC_F,     KC_G,                      KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
    KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,     KC_B,                      KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,
                                        GUIEI,    LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN
  ),

  [_LOWER] = LAYOUT_split_3x6_3(
    KC_ESC,  KC_1,    KC_2,    KC_3,    KC_4,     KC_5,                      KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC,
    CTLTB,   KC_F1,   KC_F2,   KC_F3,   KC_F4,    KC_F5,                     KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  XXXXXXX,
    KC_LSFT, KC_F11,  KC_F12,  KC_F13,  KC_F14,   KC_F15,                    KC_F16,  KC_F17,  KC_F18,  KC_F19,  KC_F20,  XXXXXXX,
                                        GUIEI,    LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN
  ),

  [_RAISE] = LAYOUT_split_3x6_3(
    KC_ESC,  KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC,                   KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC,
    CTLTB,   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                   KC_MINS, KC_EQL,  KC_LCBR, KC_RCBR, KC_PIPE, KC_GRV,
    KC_LSFT, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                   KC_UNDS, KC_PLUS, KC_LBRC, KC_RBRC, KC_BSLS, KC_TILD,
                                        GUIEI,   LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN

  ),

  [_ADJUST] = LAYOUT_split_3x6_3(
    RESET,   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
    RGB_TOG, RGB_HUI, RGB_SAI, RGB_VAI, XXXXXXX, XXXXXXX,                   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
    RGB_MOD, RGB_HUD, RGB_SAD, RGB_VAD, XXXXXXX, XXXXXXX,                   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
                                        GUIEI,   LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN
  )
};

layer_state_t layer_state_set_user(layer_state_t state) {
    state = update_tri_layer_state(state, _RAISE, _LOWER, _ADJUST);
    return state;
}


#ifdef OLED_ENABLE
oled_rotation_t oled_init_user(oled_rotation_t rotation) {
    if (is_keyboard_master()) {
        return OLED_ROTATION_270;
    } else {
        return rotation;
    }
}

void render_crkbd_logo(void) {
    static const char PROGMEM crkbd_logo[] = {
        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94,
        0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4,
        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4,
        0};
    oled_write_P(crkbd_logo, false);
}

#    define KEYLOG_LEN 5
char     keylog_str[KEYLOG_LEN] = {};
uint8_t  keylogs_str_idx        = 0;
uint16_t log_timer              = 0;

const char code_to_name[60] = {
    ' ', ' ', ' ', ' ', 'a', 'b', 'c', 'd', 'e', 'f',
    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
    'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
    '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
    'R', 'E', 'B', 'T', '_', '-', '=', '[', ']', '\\',
    '#', ';', '\'', '`', ',', '.', '/', ' ', ' ', ' '};

void add_keylog(uint16_t keycode) {
    if ((keycode >= QK_MOD_TAP && keycode <= QK_MOD_TAP_MAX) || (keycode >= QK_LAYER_TAP && keycode <= QK_LAYER_TAP_MAX)) {
        keycode = keycode & 0xFF;
    }

    for (uint8_t i = KEYLOG_LEN - 1; i > 0; i--) {
        keylog_str[i] = keylog_str[i - 1];
    }
    if (keycode < 60) {
        keylog_str[0] = code_to_name[keycode];
    }
    keylog_str[KEYLOG_LEN - 1] = 0;

    log_timer = timer_read();
}

void update_log(void) {
    if (timer_elapsed(log_timer) > 750) {
        add_keylog(0);
    }
}

void render_keylogger_status(void) {
    oled_write_P(PSTR("KLogr"), false);
    oled_write(keylog_str, false);
}

void render_default_layer_state(void) {
    oled_write_P(PSTR("Lyout"), false);
    switch (get_highest_layer(default_layer_state)) {
        case _QWERTY:
            oled_write_P(PSTR(" QRTY"), false);
            break;
    }
}

void render_layer_state(void) {
    oled_write_P(PSTR("LAYER"), false);
    oled_write_P(PSTR("Lower"), layer_state_is(_LOWER));
    oled_write_P(PSTR("Raise"), layer_state_is(_RAISE));
}

void render_keylock_status(uint8_t led_usb_state) {
    oled_write_P(PSTR("Lock:"), false);
    oled_write_P(PSTR(" "), false);
    oled_write_P(PSTR("N"), led_usb_state & (1 << USB_LED_NUM_LOCK));
    oled_write_P(PSTR("C"), led_usb_state & (1 << USB_LED_CAPS_LOCK));
    oled_write_ln_P(PSTR("S"), led_usb_state & (1 << USB_LED_SCROLL_LOCK));
}

void render_mod_status(uint8_t modifiers) {
    oled_write_P(PSTR("Mods:"), false);
    oled_write_P(PSTR(" "), false);
    oled_write_P(PSTR("S"), (modifiers & MOD_MASK_SHIFT));
    oled_write_P(PSTR("C"), (modifiers & MOD_MASK_CTRL));
    oled_write_P(PSTR("A"), (modifiers & MOD_MASK_ALT));
    oled_write_P(PSTR("G"), (modifiers & MOD_MASK_GUI));
}

void render_bootmagic_status(void) {
    /* Show Ctrl-Gui Swap options */
    static const char PROGMEM logo[][2][3] = {
        {{0x97, 0x98, 0}, {0xb7, 0xb8, 0}},
        {{0x95, 0x96, 0}, {0xb5, 0xb6, 0}},
    };
    oled_write_P(PSTR("BTMGK"), false);
    oled_write_P(PSTR(" "), false);
    oled_write_P(logo[0][0], !keymap_config.swap_lctl_lgui);
    oled_write_P(logo[1][0], keymap_config.swap_lctl_lgui);
    oled_write_P(PSTR(" "), false);
    oled_write_P(logo[0][1], !keymap_config.swap_lctl_lgui);
    oled_write_P(logo[1][1], keymap_config.swap_lctl_lgui);
    oled_write_P(PSTR(" NKRO"), keymap_config.nkro);
}

void render_status_main(void) {
    /* Show Keyboard Layout  */
    render_default_layer_state();
    render_keylock_status(host_keyboard_leds());
    render_mod_status(get_mods());
    render_bootmagic_status();

    render_keylogger_status();
}

void oled_task_user(void) {
    update_log();
    if (is_keyboard_master()) {
        render_status_main();  // Renders the current keyboard state (layer, lock, caps, scroll, etc)
    } else {
        render_crkbd_logo();
    }
}

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    if (record->event.pressed) {
        add_keylog(keycode);
    }
    return true;
}
#endif