/**
  ******************************************************************************
  * @file    LwIP/LwIP_HTTP_Server_Raw/Src/httpd_cg_ssi.c
  * @author  MCD Application Team
  * @brief   Webserver SSI and CGI handlers
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                             www.st.com/SLA0044
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "bsp.h"
#include "lwip/debug.h"
#include "lwip/tcp.h"
#include "lwip/apps/httpd.h"
#include "http_cgi_ssi.h"


#include <string.h>
#include <stdlib.h>

tSSIHandler ADC_Page_SSI_Handler;
uint32_t ADC_not_configured=1;

/* we will use character "t" as tag for CGI */
char const* TAGCHAR="t";
char const** TAGS=&TAGCHAR;

u16_t ADC_Handler(int iIndex, char *pcInsert, int iInsertLen);

/* CGI handler for LED control */ 
const char * LEDS_CGI_Handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]);
void httpd_ssi_init(void);
void httpd_cgi_init(void);

/* Html request for "/leds.cgi" will start LEDS_CGI_Handler */
const tCGI LEDS_CGI={"/leds.cgi", LEDS_CGI_Handler};

/* Cgi call table, only one CGI used */
tCGI CGI_TAB[1];

/**
  * @brief  ADC_Handler : SSI handler for ADC page 
  */
u16_t ADC_Handler(int iIndex, char *pcInsert, int iInsertLen)
{
  /* We have only one SSI handler iIndex = 0 */
  if (iIndex ==0)
  {  
    char Digit1=0, Digit2=0, Digit3=0, Digit4=0; 
    uint32_t ADCVal = 0;
    
    ADCVal = 1234;    //BSP_POTENTIOMETER_GetLevel();
    
    /* convert to Voltage,  step = 0.8 mV */
    ADCVal = (uint32_t)(ADCVal * 0.8);  
    
    /* get digits to display */
    
    Digit1= ADCVal/1000;
    Digit2= (ADCVal-(Digit1*1000))/100;
    Digit3= (ADCVal-((Digit1*1000)+(Digit2*100)))/10;
    Digit4= ADCVal -((Digit1*1000)+(Digit2*100)+ (Digit3*10));
    
    /* prepare data to be inserted in html */
    *pcInsert       = (char)(Digit1+0x30);
    *(pcInsert + 1) = (char)(Digit2+0x30);
    *(pcInsert + 2) = (char)(Digit3+0x30);
    *(pcInsert + 3) = (char)(Digit4+0x30);
    
    /* 4 characters need to be inserted in html*/
    return 4;
  }
  return 0;
}

/**
  * @brief  CGI handler for LEDs control 
  */
const char * LEDS_CGI_Handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
{
  uint32_t i=0;
  
  /* We have only one SSI handler iIndex = 0 */
  if (iIndex==0)
  {
    /* All LEDs off */
    bsp_LedOff(1);
    bsp_LedOff(2);
    bsp_LedOff(3);
    bsp_LedOff(4);
    
    /* Check cgi parameter : application GET /leds.cgi?led=2&led=4 */
    for (i=0; i<iNumParams; i++)
    {
      /* check parameter "led" */
      if (strcmp(pcParam[i] , "led")==0)   
      {
        /* Switch LED1 ON if 1 */
        if(strcmp(pcValue[i], "1") ==0) 
          bsp_LedOn(1);
          
        /* Switch LED2 ON if 2 */
        else if(strcmp(pcValue[i], "2") ==0) 
          bsp_LedOn(2);
        
        /* Switch LED3 ON if 3 */
        else if(strcmp(pcValue[i], "3") ==0) 
          bsp_LedOn(3);
        
        /* Switch LED4 ON if 4 */
        else if(strcmp(pcValue[i], "4") ==0) 
          bsp_LedOn(4);
      }
    }
  }
  /* uri to send after cgi call*/
  return "/STM32H7xxLED.html";  
}

/**
  * @brief  Http webserver Init
  */
void http_server_init(void)
{
  /* Httpd Init */
  httpd_init();
  
  /* configure SSI handlers (ADC page SSI) */
  http_set_ssi_handler(ADC_Handler, (char const **)TAGS, 1);
  
  /* configure CGI handlers (LEDs control CGI) */
  CGI_TAB[0] = LEDS_CGI;
  http_set_cgi_handlers(CGI_TAB, 1);  
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/