/*F********************************************************************
Copyright 2015-2016 Espressif Systems ( Shanghai ) PTE LTD
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 "esp32-hal.h"
#include "lwip/apps/sntp.h"
//#include "tcpip_adapter.h"
#include "esp_netif.h"



/*F********************************************************************
*
**********************************************************************/
static void 
setTimeZone(  long offset, int daylight )
{
    char cst[17] = {0}, cdt[17] = "DST", tz[33] = {0};

    if( offset % 3600 )
    {
        sprintf( cst, "UTC%ld:%02u:%02u", offset / 3600
            , abs( (offset % 3600) / 60), abs( offset % 60 ));
    } 
    else 
        sprintf( cst, "UTC%ld", offset / 3600 );
    if( daylight != 3600 )
    {
        long tz_dst = offset - daylight;
        if( tz_dst % 3600 )
		{
            sprintf( cdt, "DST%ld:%02u:%02u", tz_dst / 3600
                , abs( (tz_dst % 3600) / 60 ), abs( tz_dst % 60 ) );
        } 
        else 
            sprintf( cdt, "DST%ld", tz_dst / 3600 );
    }
    sprintf( tz, "%s%s", cst, cdt );
    setenv( "TZ", tz, 1 );
    tzset();
}



/*F********************************************************************
* configTime
 * Source: https://github.com/esp8266/Arduino/blob/master/cores/esp8266/time.c
**********************************************************************/
void 
configTime( long gmtOffset_sec, int daylightOffset_sec, const char *server1
    , const char *server2, const char *server3 )
{
    //tcpip_adapter_init();  // Should not hurt anything if already inited
    esp_netif_init();
    if( sntp_enabled() )
        sntp_stop();
    sntp_setoperatingmode( SNTP_OPMODE_POLL );
    sntp_setservername( 0, (char*)server1 );
    sntp_setservername( 1, (char*)server2 );
    sntp_setservername( 2, (char*)server3 );
    sntp_init();
    setTimeZone( -gmtOffset_sec, daylightOffset_sec );
}



/*F********************************************************************
* configTzTime
 * sntp setup using TZ environment variable
**********************************************************************/
void 
configTzTime( const char *tz, const char *server1, const char *server2
    , const char* server3 )
{
    //tcpip_adapter_init();  // Should not hurt anything if already inited
    esp_netif_init();
    if( sntp_enabled() )
        sntp_stop();
    sntp_setoperatingmode( SNTP_OPMODE_POLL );
    sntp_setservername( 0, (char*)server1 );
    sntp_setservername( 1, (char*)server2 );
    sntp_setservername( 2, (char*)server3 );
    sntp_init();
    setenv( "TZ", tz, 1 );
    tzset();
}



/*F********************************************************************
*
**********************************************************************/
bool 
getLocalTime( struct tm *info, uint32_t ms )
{
    uint32_t start = millis();
    time_t now;
    while( ( millis()-start ) <= ms ) 
    {
        time( &now );
        localtime_r( &now, info );
        if( info->tm_year > ( 2016 - 1900 ) )
            return( true );
        delay( 10 );
    }
    return( false );
}