//SD card stuff
#include <SD.h>
File myFile;

//Ethernet stuff
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xEB };
byte ip[] = {
  192,168,1, 87 };
Server server(80);

//EEPROM stuff
#include <EEPROM.h>

/*
0   = Trigger humidity
 1   = Minimum run time
 2   = Air quality
 3-4 = Schedule Start
 5-6 = Schedule Stop
 7   = Schedule Using fan 1
 8   = Schedule Using fan 2
 9   = PWM min fan 1
 10  = PWM max fan 1
 11  = PWM min fan 2
 12  = PWM max fan 2
 13  = Manual fan 1
 14  = Manual fan 2
 */


//Stuff used to process the page and url
String inString = String(150);
boolean process = false;

void setup()
{
  Ethernet.begin(mac, ip);
  server.begin();

  pinMode(10, OUTPUT); //Must be set to output for SD to work


  Serial.begin(9600);

  if (!SD.begin(4))
  {
    /*
    client.println("Please insert SD card.");
     break;
     */
  }
}

void loop()
{
  // listen for incoming clients
  Client client = server.available();
  if (client)
  {
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;

    while (client.connected())
    {
      if (client.available())
      {
        char c = client.read();

        if (inString.length() < 150)
        {
          inString += c;
        }

        if (c == '\n' && currentLineIsBlank)
        {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          break;
        }
        if (c == '\n')
        {
          // you're starting a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r')
        {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }

    if (inString.indexOf('GET /favicon.ico') == 10) //Do nothing about the .ico request
    {
      client.stop();
      inString = "";
      return;
    }

    char* filename;

    if (inString.indexOf("GET / ") != -1)
    {
      Serial.println("Using default file");
      filename = "index.htm";
    }
    else if (inString.indexOf("GET /dynamic.data") != -1)
    {
      client.print(analogRead(A0));
      client.print(",");
      client.print(analogRead(A1));
      client.print(",");
      client.print(analogRead(A2));
      client.print(",");
      client.print(analogRead(A3));
      client.print(",");
      client.println(analogRead(A4));
      delay(1);
      client.stop();
      inString = "";
      return;
    }
    else if (inString.indexOf("Save=Save") != -1)
    {
      /*
      0   = Trigger humidity
       1   = Minimum run time
       2   = Air quality
       3-4 = Schedule Start
       5-6 = Schedule Stop
       7   = Schedule Using fan 1
       8   = Schedule Using fan 2
       9   = PWM min fan 1
       10  = PWM max fan 1
       11  = PWM min fan 2
       12  = PWM max fan 2
       13  = Manual fan 1
       14  = Manual fan 2
       */
      eeWrite(0, getFunc("humidityTarget"));
      eeWrite(1, getFunc("minRunTime"));
      eeWrite(2, getFunc("airQuality"));
    }

    if (strlen(filename) <= 1)
    {
      filename = "index.htm";
    }

    myFile = SD.open(filename);
    if (myFile)
    {
      char temp[5];
      String output;
      int16_t c;
      while ((c = myFile.read()) > 0)
      {
        itoa(c, (char*)temp, 10);
        output += temp;

        if (c == '\r' || c == '\n')
        {
          client.print(output);
          output = "";
        }

        //client.print((char)c);
      }
      myFile.close();
    }
    else
    {
      // if the file didn't open, print an error:
      client.println("Could not find file \"");
      client.println(filename);
      client.println("\"");
    }

    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();

    inString = "";
  }
}

int getFunc(char* func)
{
  char* output;

  String temp = String(35);

  if(inString.indexOf(func) != -1)
  {
    int cStart = inString.indexOf("humidityTarget");
    temp = inString.substring(cStart+14);
    int cStop = temp.indexOf("&");

    String getPinDel = temp.substring(1, cStop);
    char tempNum[10];
    tempNum[getPinDel.length() + 1]; // Temp save pin value
    getPinDel.toCharArray(tempNum, 10);

    return atoi(tempNum);
  }
  else
  {
    return -1;
  }
}

int eeRead(int id)
{
  EEPROM.read(id);
}

void eeWrite(int id, int value)
{
  if (EEPROM.read(id) != value && value >= 0) //Check if it is needed to update the current value, if value is less than zero, it means it was not found in the url, and should not be attempted saved
  {
    EEPROM.write(id, value);
  }
}