/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2025 by Aidan MacDonald
 *
 * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "power.h"
#include "mutex.h"
#include "adc.h"
#include "gpio-stm32h7.h"
#include "system-echoplayer.h"
#include "regs/cortex-m/cm_scb.h"

static struct mutex power_1v8_lock;
static int power_1v8_refcount;

/* TODO: calibrate battery curve */
unsigned short battery_level_disksafe = 3500;
unsigned short battery_level_shutoff = 3400;

/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
unsigned short percent_to_volt_discharge[11] =
{
    3400, 3639, 3697, 3723, 3757, 3786, 3836, 3906, 3980, 4050, 4159
};

/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
unsigned short percent_to_volt_charge[11] =
{
    3485, 3780, 3836, 3857, 3890, 3930, 3986, 4062, 4158, 4185, 4196
};

/* API for enabling 1V8 regulator */
void echoplayer_enable_1v8_regulator(bool enable)
{
    mutex_lock(&power_1v8_lock);

    if (enable)
    {
        if (power_1v8_refcount++ == 0)
            gpio_set_level(GPIO_POWER_1V8, 1);
    }
    else
    {
        if (--power_1v8_refcount == 0)
            gpio_set_level(GPIO_POWER_1V8, 0);
    }

    mutex_unlock(&power_1v8_lock);
}

/* Power management */
void power_init(void)
{
    mutex_init(&power_1v8_lock);
}

void power_off(void)
{
    /*
     * Disable power and reset to the bootloader immediately.
     * The system can't really be powered off as long as USB
     * is plugged or the power button is pressed -- it's the
     * bootloader's job to monitor those inputs and decide
     * when the system needs to "really" power on.
     */
    gpio_set_level(GPIO_CPU_POWER_ON, 0);

    reg_writef(CM_SCB_AIRCR, VECTKEY_V(KEY), SYSRESETREQ(1));
    while (1);
}

void system_reboot(void)
{
    /*
     * Disable IRQs to ensure an errant panic can't disturb
     * the RTC reconfig.
     */
    disable_irq();

    /*
     * Configure RTC_OUT pin to keep power enabled during
     * reset and then do a normal power off. If this fails
     * to reset back to the bootloader then the RTC_OUT
     * pin will go low automatically after some timeout.
     */
    echoplayer_set_rtcout_mode(ECHOPLAYER_RTCOUT_REBOOT);
    power_off();
}

#ifdef HAVE_USB_CHARGING_ENABLE
void usb_charging_maxcurrent_change(int maxcurrent)
{
    const int conf_500ma = GPIOF_OUTPUT(0, GPIO_TYPE_PUSH_PULL,
                                        GPIO_SPEED_LOW, GPIO_PULL_DISABLED);
    const int conf_100ma = GPIOF_INPUT(GPIO_PULL_DISABLED);

    if (maxcurrent > 100)
        gpio_configure_single(GPIO_CHARGER_CHARGING, conf_500ma);
    else
        gpio_configure_single(GPIO_CHARGER_CHARGING, conf_100ma);
}
#endif

unsigned int power_input_status(void)
{
    if (gpio_get_level(GPIO_USB_VBUS))
        return POWER_INPUT_USB_CHARGER;

    return POWER_INPUT_NONE;
}

bool charging_state(void)
{
    return gpio_get_level(GPIO_CHARGER_CHARGING) == 0;
}

int _battery_voltage(void)
{
    return adc_read(ADC_CHANNEL_BATTERY);
}