/* Copyright 2023 Dual Tachyon
 * https://github.com/DualTachyon
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 */

#include "backlight.h"
#include "bsp/dp32g030/gpio.h"
#include "bsp/dp32g030/pwmplus.h"
#include "bsp/dp32g030/portcon.h"
#include "driver/gpio.h"
#include "settings.h"

#ifdef ENABLE_FEAT_F4HWN
    #include "driver/system.h"
    #include "audio.h"
    #include "misc.h"
#endif

// this is decremented once every 500ms
uint16_t gBacklightCountdown_500ms = 0;
bool backlightOn;

#ifdef ENABLE_FEAT_F4HWN
    const uint8_t value[] = {0, 3, 6, 9, 15, 24, 38, 62, 100, 159, 255};
#endif

#ifdef ENABLE_FEAT_F4HWN_SLEEP
    uint16_t gSleepModeCountdown_500ms = 0;
#endif

void BACKLIGHT_InitHardware()
{
    // 48MHz / 94 / 1024 ~ 500Hz
    const uint32_t PWM_FREQUENCY_HZ =  25000;
    PWM_PLUS0_CLKSRC |= ((48000000 / 1024 / PWM_FREQUENCY_HZ) << 16);
    PWM_PLUS0_PERIOD = 1023;

    PORTCON_PORTB_SEL0 &= ~(0
        // Back light
        | PORTCON_PORTB_SEL0_B6_MASK
        );
    PORTCON_PORTB_SEL0 |= 0
        // Back light PWM
        | PORTCON_PORTB_SEL0_B6_BITS_PWMP0_CH0
        ;

    PWM_PLUS0_GEN =     
        PWMPLUS_GEN_CH0_OE_BITS_ENABLE |
        PWMPLUS_GEN_CH0_OUTINV_BITS_ENABLE |
        0;

    PWM_PLUS0_CFG =     
        PWMPLUS_CFG_CNT_REP_BITS_ENABLE |
        PWMPLUS_CFG_COUNTER_EN_BITS_ENABLE |
        0;
}

void BACKLIGHT_TurnOn(void)
{
    #ifdef ENABLE_FEAT_F4HWN_SLEEP
        gSleepModeCountdown_500ms = gSetting_set_off * 120;
    #endif

    #ifdef ENABLE_FEAT_F4HWN
        gBacklightBrightnessOld = BACKLIGHT_GetBrightness();
    #endif

    if (gEeprom.BACKLIGHT_TIME == 0) {
        BACKLIGHT_TurnOff();
        return;
    }

    backlightOn = true;
        BACKLIGHT_SetBrightness(gEeprom.BACKLIGHT_MAX);

    switch (gEeprom.BACKLIGHT_TIME) {
        default:
        case 1 ... 60:  // 5 sec * value
            gBacklightCountdown_500ms = 1 + (gEeprom.BACKLIGHT_TIME * 5) * 2;
            break;
        case 61:    // always on
            gBacklightCountdown_500ms = 0;
            break;
    }
}

void BACKLIGHT_TurnOff()
{
#ifdef ENABLE_BLMIN_TMP_OFF
    register uint8_t tmp;

    if (gEeprom.BACKLIGHT_MIN_STAT == BLMIN_STAT_ON)
        tmp = gEeprom.BACKLIGHT_MIN;
    else
        tmp = 0;

    BACKLIGHT_SetBrightness(tmp);
#else
    BACKLIGHT_SetBrightness(gEeprom.BACKLIGHT_MIN);
#endif
    gBacklightCountdown_500ms = 0;
    backlightOn = false;
}

bool BACKLIGHT_IsOn()
{
    return backlightOn;
}

static uint8_t currentBrightness;

void BACKLIGHT_SetBrightness(uint8_t brigtness)
{
    currentBrightness = brigtness;
    PWM_PLUS0_CH0_COMP = value[brigtness] * 4;
    //PWM_PLUS0_CH0_COMP = (1 << brigtness) - 1;
    //PWM_PLUS0_SWLOAD = 1;
}

uint8_t BACKLIGHT_GetBrightness(void)
{
    return currentBrightness;
}