/**
 * This software is subject to the ANT+ Shared Source License
 * www.thisisant.com/swlicenses
 * Copyright (c) Dynastream Innovations, Inc. 2014
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 1) Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 * 
 * 2) Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 * 
 * 3) Neither the name of Dynastream nor the names of its
 *    contributors may be used to endorse or promote products
 *    derived from this software without specific prior
 *    written permission.
 * 
 * The following actions are prohibited:
 * 1) Redistribution of source code containing the ANT+ Network
 *    Key. The ANT+ Network Key is available to ANT+ Adopters.
 *    Please refer to http://thisisant.com to become an ANT+
 *    Adopter and access the key.
 * 
 * 2) Reverse engineering, decompilation, and/or disassembly of
 *    software provided in binary form under this license.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; DAMAGE TO ANY DEVICE, LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE. SOME STATES DO NOT ALLOW
 * THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE
 * ABOVE LIMITATIONS MAY NOT APPLY TO YOU.
 * 
 */

/**@file
 * @defgroup ant_shared_channel_slave_demo ANT Auto Shared Slave Example
 * @{
 * @ingroup ant_shared_channel
 *
 * @brief Example of ANT Auto Shared Channel (ASC) Slave.
 *
 * Before compiling this example for NRF52, complete the following steps:
 * - Download the S212 SoftDevice from <a href="https://www.thisisant.com/developer/components/nrf52832" target="_blank">thisisant.com</a>.
 * - Extract the downloaded zip file and copy the S212 SoftDevice headers to <tt>\<InstallFolder\>/components/softdevice/s212/headers</tt>.
 * If you are using Keil packs, copy the files into a @c headers folder in your example folder.
 * - Make sure that @ref ANT_LICENSE_KEY in @c nrf_sdm.h is uncommented.
 */

/* Version 0.0.2 */

#include <stdint.h>
#include "ant_interface.h"
#include "app_error.h"
#include "app_timer.h"
#include "app_util_platform.h"
#include "ant_parameters.h"
#include "asc_events.h"
#include "asc_parameters.h"
#include "asc_slave.h"
#include "boards.h"
#include "hardfault.h"
#include "leds.h"
#include "nrf_delay.h"
#include "nrf_sdm.h"

// Channel configuration.
#define ASCS_CHANNEL                    0x00u               /**< ANT Channel 0. */
#define ANT_PUBLIC_NETWORK_NUMBER       0x00u               /**< ANT Public/Default Network Key. */
#define ASCS_RF_FREQUENCY               0x42u               /**< 2400 + 66Mhz. */
#define ASCS_CHANNEL_PERIOD             MSG_PERIOD_4HZ

// Channel ID configuration.
#define ASCS_DEVICE_TYPE                0x02u               /**< Device type. */
#define ASCS_DEVICE_NUMBER              0x00u               /**< Device number. */
#define ASCS_TX_TYPE                    0x00u               /**< Transmission type. */

// Miscellaneous defines.
    #define LED_ERROR_0     BSP_LED_0
    #define LED_ERROR_1     BSP_LED_1
    #define LED_ERROR_2     LED_INVALID
    #define LED_ERROR_3     LED_INVALID

    #define LIGHT           BSP_LED_0
    #define POLLED_LED      LED_INVALID
    #define CONNECTED_LED   BSP_LED_1

// One-second tick timer defines
#define RTC_COUNTER_FREQ                1024u                                                       /**< Desired RTC COUNTER frequency in Hz. */
#define RTC_PRESCALER                   (ROUNDED_DIV(APP_TIMER_CLOCK_FREQ, RTC_COUNTER_FREQ) - 1u)  /**< Computed value of the RTC prescaler register. */
#define RTC_EVENT_INTERVAL_MS           1000                                                        /**< event interval in milliseconds. */

// Static variables and buffers.us
static uint16_t                 m_device_number = 0x00;
static const asc_ant_params_t   m_asc_parameters = {

    ASCS_CHANNEL,
    ANT_PUBLIC_NETWORK_NUMBER,
    &m_device_number,
    ASCS_DEVICE_TYPE,
    ASCS_TX_TYPE,
    ASCS_CHANNEL_PERIOD,
    CHANNEL_TYPE_SHARED_SLAVE,
    ASCS_RF_FREQUENCY,
    RADIO_TX_POWER_LVL_3
}; /**< Structure containing setup parameters for an auto shared slave. */
APP_TIMER_DEF(m_timer_id);


/**@brief Function for stack interrupt handling.
 *
 * Implemented to clear the pending flag when receiving
 * an interrupt from the stack.
 */
void SD_EVT_IRQHandler(void)
{
}

/**@brief Function for handling SoftDevice asserts.
 *
 */
void softdevice_assert_callback(uint32_t id, uint32_t pc, uint32_t info)
{
    for (;;)
    {
        // No implementation needed.
        #ifdef DEBUG_LED
            led_on(LED_ERROR_1);
            nrf_delay_ms(20);
            led_off(LED_ERROR_1);
        #endif
    }
}

/**@brief Function for handling HardFault.
 */
void HardFault_process(HardFault_stack_t *p_stack)
{
    for (;;)
    {
        // No implementation needed.
        #ifdef DEBUG_LED
            led_on(LED_ERROR_0);
            nrf_delay_ms(20);
            led_off(LED_ERROR_0);
        #endif
    }
}


/**@brief Callback function for the one-second timer
 */
void one_second_timer_callback(void * p_context)
{
    ascs_increment_timer();
}


/**@brief Function to initialise and start the one-second timer
 */
void init_timer(void)
{
    uint32_t       err_code;

    APP_TIMER_INIT(RTC_PRESCALER, 1u, false);
    err_code = app_timer_create(&m_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                one_second_timer_callback);
    APP_ERROR_CHECK(err_code);

    err_code = app_timer_start(m_timer_id, APP_TIMER_TICKS(RTC_EVENT_INTERVAL_MS, RTC_PRESCALER), NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function to get and handle ant events.
 */
void poll_for_ant_events(void)
{
    static uint32_t err_code;
    static uint8_t  event;
    static uint8_t  ant_channel;
    static uint8_t  event_message_buffer[MESG_BUFFER_SIZE];

    err_code = sd_ant_event_get(&ant_channel, &event, event_message_buffer);
    if (err_code == NRF_SUCCESS)
    {
        if (ant_channel == ASCS_CHANNEL)
        {
            led_toggle(POLLED_LED);
            ascs_handle_ant_event(event, event_message_buffer);
        }
    }
}


/**@breif  Function for checking event flags and handling them.
 */
void check_and_handle_asc_flags(void)
{
    uint32_t asc_flags = ascs_events_get();

    do
    {
        if (asc_flags & EVENT_ASC_STATE_CHANGED)
        {

            ascs_event_clear(EVENT_ASC_STATE_CHANGED);

            //Determine which state changed and react
            ascs_states_t state = ascs_state_get();
            switch (state)
            {
                case ASSIGNED:
                {
                    led_on(CONNECTED_LED);
                    break;
                }
                case SEARCHING:     //Intentional fallthrough
                case REQUESTING:    //Intentional fallthrough
                case WAITING:       //Intentional fallthrough
                case CONFIRMING:    //Intentional fallthrough
                case OFF:           //Intentional fallthrough
                default:
                {
                    led_off(CONNECTED_LED);
                    break;
                }
            }
        }

        if (asc_flags & EVENT_ASC_DEVICE_IN_WRONG_STATE)
        {
            ascs_event_clear(EVENT_ASC_DEVICE_IN_WRONG_STATE);
            //Do nothing
            for (;;)
            {
                led_toggle(LED_ERROR_0);
                led_toggle(LED_ERROR_1);
                led_toggle(LED_ERROR_2);
                led_toggle(LED_ERROR_3);
                nrf_delay_ms(200);
            }
        }

        if (asc_flags & EVENT_ASC_LIGHT_STATE_CHANGED)
        {
            ascs_event_clear(EVENT_ASC_LIGHT_STATE_CHANGED);
            asc_slave_states_t light_state = ascs_light_state_get();

            switch (light_state)
            {
                case SLAVE_STATE_ON:
                {
                    led_on(LIGHT);
                    break;
                }
                case SLAVE_STATE_OFF:
                {
                    led_off(LIGHT);
                    break;
                }
                default:
                {
                    break;
                }
            }
        }

        if (asc_flags & EVENT_ASC_REQUEST_RECEIVED)
        {
            ascs_event_clear(EVENT_ASC_REQUEST_RECEIVED);

            uint8_t response_buffer[ANT_STANDARD_DATA_PAYLOAD_SIZE] = {0};

            asc_request_data_t request = ascs_get_last_request();

            //encode the response buffer with whatever page was requested
            switch (request.page_id_requested)
            {
                default:
                {
                    break;
                }
            }

            //tell the slave to send the response
            ascs_send_response(response_buffer);
        }

        if (asc_flags & EVENT_ASC_DATA_TIMEOUT)
        {
            ascs_event_clear(EVENT_ASC_DATA_TIMEOUT);
            //Do nothing
        }

        asc_flags = ascs_events_get();
    }
    while (asc_flags != 0);
}


/**@brief Function for application main entry. Does not return.
 */
int main(void)
{
#if 0
    led_init();

    led_on(BSP_LED_0);
    led_on(BSP_LED_1);

    for (;;)
    {

    }
#endif // 0

    uint32_t err_code;

    // Configure pins LED_A - LED_D as outputs.
    led_init();

    // Enable SoftDevice.

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    err_code = sd_softdevice_enable(&clock_lf_cfg,
                                    softdevice_assert_callback,
                                    ANT_LICENSE_KEY);
    APP_ERROR_CHECK(err_code);

    // Set application IRQ to lowest priority.
    err_code = sd_nvic_SetPriority(SD_EVT_IRQn, APP_IRQ_PRIORITY_LOWEST);
    APP_ERROR_CHECK(err_code);

    // Enable application IRQ (triggered from protocol).
    err_code = sd_nvic_EnableIRQ(SD_EVT_IRQn);
    APP_ERROR_CHECK(err_code);

    //Initialise and start the one second timer;
    init_timer();

    //Initialise and start the auto shared channel module
    ascs_init(&m_asc_parameters);
    ascs_turn_on();
    check_and_handle_asc_flags();

    // Main loop.
    for (;;)
    {
        // Put CPU in sleep if possible.
        err_code = sd_app_evt_wait();
        APP_ERROR_CHECK(err_code);

        poll_for_ant_events();
        check_and_handle_asc_flags();
    }
}

/**
 *@}
 **/
