/***************************************************************************
 *   Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO,                    *
 *                         Niccolò Izzo IU2KIN,                            *
 *                         Silvano Seva IU2KWO                             *
 *                                                                         *
 *   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 3 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 <interfaces/platform.h>
#include <interfaces/gpio.h>
#include <hwconfig.h>
#include <string.h>
#include <ADC1_MDx.h>
#include <calibInfo_MDx.h>
#include <interfaces/nvmem.h>
#include <interfaces/rtc.h>
#include <qdec.h>

#ifdef ENABLE_BKLIGHT_DIMMING
#include <backlight.h>
#endif

mduv3x0Calib_t calibration;
hwInfo_t hwInfo;
static int8_t knob_pos = 0;

/*
 * Note that this interrupt handler currently assumes only the encoder will
 * ever cause this interrupt to fire
 */
void _Z20EXTI15_10_IRQHandlerv()
{
    /* State storage */
    static uint8_t last_state = 0;

    /* Read curent pin state */
    uint8_t pin_state = gpio_readPin(CH_SELECTOR_1)<<1 | gpio_readPin(CH_SELECTOR_0);
    /* Look up next state */
    uint8_t next_state = HALF_STEP_STATE_TRANSITIONS[last_state][pin_state];
    /* update state for next call */
    last_state = next_state & QDECODER_STATE_BITMASK;

    /* Mask out events to switch on */
    uint8_t event = next_state & QDECODER_EVENT_BITMASK;

    /* Update file global knob_pos variable */
    switch (event)
    {
        case QDECODER_EVENT_CW:
            knob_pos++;
            break;
        case QDECODER_EVENT_CCW:
            knob_pos--;
            break;
        default:
            break;
    }

    /* Clear pin change flags */
    EXTI->PR = EXTI_PR_PR11 | EXTI_PR_PR14;
}

void platform_init()
{
    /* Configure GPIOs */
    gpio_setMode(GREEN_LED, OUTPUT);
    gpio_setMode(RED_LED,   OUTPUT);

    gpio_setMode(CH_SELECTOR_0, INPUT_PULL_UP);
    gpio_setMode(CH_SELECTOR_1, INPUT_PULL_UP);

    EXTI->IMR  |= EXTI_IMR_MR11 | EXTI_IMR_MR14;
    EXTI->RTSR |= EXTI_RTSR_TR11 | EXTI_RTSR_TR14;
    EXTI->FTSR |= EXTI_FTSR_TR11 | EXTI_FTSR_TR14;

    SYSCFG->EXTICR[2] |= SYSCFG_EXTICR3_EXTI11_PB;
    SYSCFG->EXTICR[3] |= SYSCFG_EXTICR4_EXTI14_PE;

    NVIC_ClearPendingIRQ(EXTI15_10_IRQn);
    NVIC_SetPriority(EXTI15_10_IRQn, 15);
    NVIC_EnableIRQ(EXTI15_10_IRQn);

    gpio_setMode(PTT_SW, INPUT_PULL_UP);

    gpio_setMode(PWR_SW, OUTPUT);

    /*
     * Initialise ADC1, for vbat, RSSI, ...
     * Configuration of corresponding GPIOs in analog input mode is done inside
     * the driver.
     */
    adc1_init();

    memset(&hwInfo, 0x00, sizeof(hwInfo));

    nvm_init();                      /* Initialise non volatile memory manager */
    nvm_readCalibData(&calibration); /* Load calibration data                  */
    nvm_loadHwInfo(&hwInfo);         /* Load hardware information data         */
    rtc_init();                      /* Initialise RTC                         */

    #ifdef ENABLE_BKLIGHT_DIMMING
    backlight_init();                /* Initialise backlight driver            */
    #else
    gpio_setMode(LCD_BKLIGHT, OUTPUT);
    gpio_clearPin(LCD_BKLIGHT);
    #endif
}

void platform_terminate()
{
    /* Shut down backlight */
    #ifdef ENABLE_BKLIGHT_DIMMING
    backlight_terminate();
    #else
    gpio_clearPin(LCD_BKLIGHT);
    #endif

    /* Shut down LEDs */
    gpio_clearPin(GREEN_LED);
    gpio_clearPin(RED_LED);

    /* Shut down all the modules */
    adc1_terminate();
    nvm_terminate();
    rtc_terminate();

    /* Finally, remove power supply */
    gpio_clearPin(PWR_SW);
}

float platform_getVbat()
{
    /*
     * Battery voltage is measured through an 1:3 voltage divider and
     * adc1_getMeasurement returns a value in mV. Thus, to have effective
     * battery voltage multiply by three and divide by 1000
     */
    return adc1_getMeasurement(ADC_VBAT_CH)*3.0f/1000.0f;
}

float platform_getMicLevel()
{
    return 0.0f;
}

float platform_getVolumeLevel()
{
    return adc1_getMeasurement(ADC_VOL_CH);
}

int8_t platform_getChSelector()
{
    /*
     * The knob_pos variable is set in the EXTI15_10 interrupt handler
     * this is safe because interrupt nesting is not allowed.
     */
    return knob_pos;
}

bool platform_getPttStatus()
{
    /* PTT line has a pullup resistor with PTT switch closing to ground */
    return (gpio_readPin(PTT_SW) == 0) ? true : false;
}

void platform_ledOn(led_t led)
{
    switch(led)
    {
        case GREEN:
            gpio_setPin(GREEN_LED);
            break;

        case RED:
            gpio_setPin(RED_LED);
            break;

        default:
            break;
    }
}

void platform_ledOff(led_t led)
{
    switch(led)
    {
        case GREEN:
            gpio_clearPin(GREEN_LED);
            break;

        case RED:
            gpio_clearPin(RED_LED);
            break;

        default:
            break;
    }
}

void platform_beepStart(uint16_t freq)
{
    /* TODO */
    (void) freq;
}

void platform_beepStop()
{
    /* TODO */
}

const void *platform_getCalibrationData()
{
    return ((const void *) &calibration);
}

const hwInfo_t *platform_getHwInfo()
{
    return &hwInfo;
}

/*
 * NOTE: when backligth dimming is enabled, the implementation of this API
 * function is provided in platform/drivers/backlight/backlight_MDx.c to avoid
 * an useless function call.
 */
#ifndef ENABLE_BKLIGHT_DIMMING
void platform_setBacklightLevel(uint8_t level)
{
    if(level > 1)
    {
        gpio_setPin(LCD_BKLIGHT);
    }
    else
    {
        gpio_clearPin(LCD_BKLIGHT);
    }
}
#endif