/* Copyright 2021 HorrorTroll <https://github.com/HorrorTroll>
 *
 * 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/>.
 */

// variable for startup animation
bool BASE_EFFECT_NOT_STARTED_YET = true;
uint8_t base_effect_startup_counter = 255;

uint8_t led_count = 10;
uint8_t led_first = 7;

static uint8_t time_to_led(uint8_t time, uint8_t led_behind) {
    uint16_t led_time = led_count * time;
    uint16_t step = ((2 * led_count + (led_time / 128)) - led_behind) % (2 * led_count);
    uint8_t led;

    if (step < led_count) {
        led = step;
    } else {
        led = led_count - 1 - (step - led_count);
    }

    return led;
}

static HSV KITT_math(HSV hsv, uint8_t i, uint8_t time) {

    // reset base effect startup
    if (i == 0) {
        BASE_EFFECT_NOT_STARTED_YET = true;
    }

    hsv.h = 0;
    hsv.s = 255;

    if (i >= led_first && i < led_first + led_count) {
        uint8_t j = i - led_first;
        if (j == time_to_led(time, 0)) {
            hsv.v = hsv.v;
        } else if (j == time_to_led(time, 1)) {
            hsv.v = hsv.v/2;
        } else if (j == time_to_led(time, 2)) {
            hsv.v = hsv.v/4;
        } else if (j == time_to_led(time, 3)) {
            hsv.v = hsv.v/8;
        } else {
            hsv.v = 0;
        }
    } else {
        hsv.v = 0;
    }

    return hsv;
}

bool KITT(effect_params_t* params) { return effect_runner_i(params, &KITT_math); }