// hwdef for Noctigon M44 2-channel light
// Copyright (C) 2023 Selene ToyKeeper
// SPDX-License-Identifier: GPL-3.0-or-later

#pragma once

#include "chan-rgbaux.c"


void set_level_zero();

void set_level_ch1(uint8_t level);
void set_level_ch2(uint8_t level);
void set_level_both(uint8_t level);
void set_level_blend(uint8_t level);
void set_level_auto(uint8_t level);

bool gradual_tick_ch1(uint8_t gt);
bool gradual_tick_ch2(uint8_t gt);
bool gradual_tick_both(uint8_t gt);
bool gradual_tick_blend(uint8_t gt);
bool gradual_tick_auto(uint8_t gt);


Channel channels[] = {
    { // channel 1 only
        .set_level    = set_level_ch1,
        .gradual_tick = gradual_tick_ch1,
        .has_args     = 0
    },
    { // channel 2 only
        .set_level    = set_level_ch2,
        .gradual_tick = gradual_tick_ch2,
        .has_args     = 0
    },
    { // both channels, tied together (max "200%" power)
        .set_level    = set_level_both,
        .gradual_tick = gradual_tick_both,
        .has_args     = 0
    },
    { // both channels, manual blend (max "100%" power)
        .set_level    = set_level_blend,
        .gradual_tick = gradual_tick_blend,
        .has_args     = 1
    },
    { // both channels, auto blend
        .set_level    = set_level_auto,
        .gradual_tick = gradual_tick_auto,
        .has_args     = 1
    },
    RGB_AUX_CHANNELS
};


// set new values for both channels,
// handling any possible combination
// and any before/after state
void set_pwms(uint16_t ch1_pwm, uint16_t ch2_pwm, uint16_t top,
              uint8_t ch1_on, uint8_t ch2_on) {

    bool was_on = (CH1_PWM>0) || (CH2_PWM>0)
                || ( CH1_ENABLE_PORT & (1 << CH1_ENABLE_PIN) )
                || ( CH2_ENABLE_PORT & (1 << CH2_ENABLE_PIN) );
    bool now_on = (ch1_pwm>0) || (ch2_pwm>0) || ch1_on || ch2_on;

    // phase-correct PWM at zero (for flicker-free moon),
    // fast PWM otherwise
    if (ch1_pwm || ch2_pwm)
        TCCR1B  = (0<<CS12)   | (0<<CS11) | (1<<CS10)  // clk/1 (no prescaling) (DS table 12-6)
                | (1<<WGM13)  | (1<<WGM12)  // fast adjustable PWM (DS table 12-5)
                //| (1<<WGM13)  | (0<<WGM12)  // phase-correct adjustable PWM (DS table 12-5)
                ;
    else
        TCCR1B  = (0<<CS12)   | (0<<CS11) | (1<<CS10)  // clk/1 (no prescaling) (DS table 12-6)
                //| (1<<WGM13)  | (1<<WGM12)  // fast adjustable PWM (DS table 12-5)
                | (1<<WGM13)  | (0<<WGM12)  // phase-correct adjustable PWM (DS table 12-5)
                ;

    if (ch1_pwm || ch1_on)
        CH1_ENABLE_PORT |= (1 << CH1_ENABLE_PIN);  // enable opamp
    else
        CH1_ENABLE_PORT &= ~(1 << CH1_ENABLE_PIN);  // disable opamp

    if (ch2_pwm || ch2_on)
        CH2_ENABLE_PORT |= (1 << CH2_ENABLE_PIN);  // enable opamp
    else
        CH2_ENABLE_PORT &= ~(1 << CH2_ENABLE_PIN);  // disable opamp

    CH1_PWM = ch1_pwm;
    CH2_PWM = ch2_pwm;

    // manual phase sync when changing level while already on
    if (was_on && now_on) while(PWM_CNT > (top - 32)) {}

    PWM_TOP = top;

    // reset phase when turning on or off
    //if ((! was_on) | (! now_on)) PWM_CNT = 0;
    if (! was_on) PWM_CNT = 0;
}

void set_level_zero() {
    CH1_PWM = 0;
    CH2_PWM = 0;
    PWM_TOP = PWM_TOP_INIT;
    PWM_CNT = 0;
    CH1_ENABLE_PORT &= ~(1 << CH1_ENABLE_PIN);  // disable opamp
    CH2_ENABLE_PORT &= ~(1 << CH2_ENABLE_PIN);  // disable opamp
}

void set_level_ch1(uint8_t level) {
    uint16_t pwm = PWM_GET(pwm1_levels, level);
    uint16_t top = PWM_GET(pwm_tops, level);
    set_pwms(pwm, 0, top, 1, 0);
}

void set_level_ch2(uint8_t level) {
    uint16_t pwm = PWM_GET(pwm1_levels, level);
    uint16_t top = PWM_GET(pwm_tops, level);
    set_pwms(0, pwm, top, 0, 1);
}

void set_level_both(uint8_t level) {
    uint16_t pwm = PWM_GET(pwm1_levels, level);
    uint16_t top = PWM_GET(pwm_tops, level);
    set_pwms(pwm, pwm, top, 1, 1);
}

void set_level_blend(uint8_t level) {
    PWM_DATATYPE ch1_pwm, ch2_pwm;
    PWM_DATATYPE brightness = PWM_GET(pwm1_levels, level);
    PWM_DATATYPE top        = PWM_GET(pwm_tops, level);
    uint8_t blend           = cfg.channel_mode_args[channel_mode];

    calc_2ch_blend(&ch1_pwm, &ch2_pwm, brightness, top, blend);

    // don't turn off either emitter entirely while using middle blends
    set_pwms(ch1_pwm, ch2_pwm, top,
             blend < 255, blend > 0);
}

void set_level_auto(uint8_t level) {
    PWM_DATATYPE ch1_pwm, ch2_pwm;
    PWM_DATATYPE brightness = PWM_GET(pwm1_levels, level);
    PWM_DATATYPE top        = PWM_GET(pwm_tops, level);
    uint8_t blend           = 255 * (uint16_t)level / RAMP_SIZE;
    if (cfg.channel_mode_args[channel_mode] & 0b01000000)
        blend = 255 - blend;

    calc_2ch_blend(&ch1_pwm, &ch2_pwm, brightness, top, blend);

    // don't turn off either emitter entirely
    // (it blinks pretty bright when the regulator turns on mid-ramp)
    set_pwms(ch1_pwm, ch2_pwm, top, 1, 1);
}


///// bump each channel toward a target value /////
bool gradual_adjust(uint16_t ch1_pwm, uint16_t ch2_pwm) {
    GRADUAL_ADJUST_SIMPLE(ch1_pwm, CH1_PWM);
    GRADUAL_ADJUST_SIMPLE(ch2_pwm, CH2_PWM);

    // check for completion
    if ((ch1_pwm == CH1_PWM)
     && (ch2_pwm == CH2_PWM)) {
        return true;  // done
    }
    return false;  // not done yet
}

bool gradual_tick_ch1(uint8_t gt) {
    uint16_t pwm = PWM_GET(pwm1_levels, gt);
    return gradual_adjust(pwm, 0);
}

bool gradual_tick_ch2(uint8_t gt) {
    uint16_t pwm = PWM_GET(pwm1_levels, gt);
    return gradual_adjust(0, pwm);
}

bool gradual_tick_both(uint8_t gt) {
    uint16_t pwm = PWM_GET(pwm1_levels, gt);
    return gradual_adjust(pwm, pwm);
}

bool gradual_tick_blend(uint8_t gt) {
    PWM_DATATYPE ch1_pwm, ch2_pwm;
    PWM_DATATYPE brightness = PWM_GET(pwm1_levels, gt);
    PWM_DATATYPE top        = PWM_GET(pwm_tops, gt);
    uint8_t blend           = cfg.channel_mode_args[channel_mode];

    calc_2ch_blend(&ch1_pwm, &ch2_pwm, brightness, top, blend);

    return gradual_adjust(ch1_pwm, ch2_pwm);
}

bool gradual_tick_auto(uint8_t gt) {
    PWM_DATATYPE ch1_pwm, ch2_pwm;
    PWM_DATATYPE brightness = PWM_GET(pwm1_levels, gt);
    PWM_DATATYPE top        = PWM_GET(pwm_tops, gt);
    uint8_t blend           = 255 * (uint16_t)gt / RAMP_SIZE;
    if (cfg.channel_mode_args[channel_mode] & 0b01000000)
        blend = 255 - blend;

    calc_2ch_blend(&ch1_pwm, &ch2_pwm, brightness, top, blend);

    return gradual_adjust(ch1_pwm, ch2_pwm);
}