/* Copyright 2016 Jack Humbert
 *
 * 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 "process_unicode.h"
#include "action_util.h"

static uint8_t input_mode;
static uint8_t first_flag = 0;

__attribute__((weak))
uint16_t hex_to_keycode(uint8_t hex)
{
  if (hex == 0x0) {
    return KC_0;
  } else if (hex < 0xA) {
    return KC_1 + (hex - 0x1);
  } else {
    return KC_A + (hex - 0xA);
  }
}

void set_unicode_input_mode(uint8_t os_target)
{
  input_mode = os_target;
  eeprom_update_byte(EECONFIG_UNICODEMODE, os_target);
}

uint8_t get_unicode_input_mode(void) {
  return input_mode;
}

__attribute__((weak))
void unicode_input_start (void) {
  switch(input_mode) {
  case UC_OSX:
    register_code(KC_LALT);
    break;
  case UC_LNX:
    register_code(KC_LCTL);
    register_code(KC_LSFT);
    register_code(KC_U);
    unregister_code(KC_U);
    unregister_code(KC_LSFT);
    unregister_code(KC_LCTL);
    break;
  case UC_WIN:
    register_code(KC_LALT);
    register_code(KC_PPLS);
    unregister_code(KC_PPLS);
    break;
  case UC_WINC:
    register_code(KC_RALT);
    unregister_code(KC_RALT);
    register_code(KC_U);
    unregister_code(KC_U);
  }
  wait_ms(UNICODE_TYPE_DELAY);
}

__attribute__((weak))
void unicode_input_finish (void) {
  switch(input_mode) {
  case UC_OSX:
  case UC_WIN:
    unregister_code(KC_LALT);
    break;
  case UC_LNX:
    register_code(KC_SPC);
    unregister_code(KC_SPC);
    break;
  }
}

void register_hex(uint16_t hex) {
  for(int i = 3; i >= 0; i--) {
    uint8_t digit = ((hex >> (i*4)) & 0xF);
    register_code(hex_to_keycode(digit));
    unregister_code(hex_to_keycode(digit));
  }
}


bool process_unicode(uint16_t keycode, keyrecord_t *record) {
  if (keycode > QK_UNICODE && record->event.pressed) {
    if (first_flag == 0) {
      set_unicode_input_mode(eeprom_read_byte(EECONFIG_UNICODEMODE));
      first_flag = 1;
    }
    uint16_t unicode = keycode & 0x7FFF;
    unicode_input_start();
    register_hex(unicode);
    unicode_input_finish();
  }
  return true;
}