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#include <SPI.h>
#include <Ethernet.h>
#include <DHT.h>
#include <SD.h>

#define REQ_BUF_SZ 200

byte SELF_MAC[] = {0x00, 0x2A, 0xF5, 0x12, 0x67, 0xFA};
byte SELF_IP[] =  {192, 168, 0, 177};
//byte DNS[] = { , , , };
byte GATEWAY[] = {192, 168, 0, 1};

DHT dht(40, DHT22);
File webFile;
EthernetServer server(80);
char HTTP_req[REQ_BUF_SZ] = {0};
char req_index = 0;

void setup() {
  Serial.begin(9600);
  Ethernet.begin(SELF_MAC, SELF_IP, GATEWAY);
  server.begin();
  dht.begin();
  sd_init();
}
/*
  LOOP
*/
void loop() {
  /*float air_hum = dht.readHumidity();
  float air_temp = dht.readTemperature();
   Serial.print(air_hum);
  Serial.print("   ");
  Serial.println(air_temp);
  delay(500); */
  EthernetClient client = server.available();
  if (client) {
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.print(c);
        if (req_index < (REQ_BUF_SZ - 1)) {
          HTTP_req[req_index] = c; // save HTTP request character
          req_index++;
        }
        if (c == '\n' && currentLineIsBlank) {
          if (StrContains(HTTP_req, "Authorization: Basic bG9naW46cGFzc3dvcmQ=")) {
            Serial.println("Hash founded");
             if(StrContains(HTTP_req, "GET / ") || StrContains(HTTP_req, "GET /index.htm")) {
              webFile = SD.open("index.htm");
              Serial.print("file opened");
              if (webFile) {
              client.println("HTTP/1.1 200 OK");
              client.println("Content-Type: text/html");
              client.println("Connection: close");
              client.println();
            }
            }
          }
          else {
            client.println("HTTP/1.1 401 Unauthorized");
            client.println("WWW-Authenticate: Basic realm=\"Web control panel");
          }
          req_index = 0;
          StrClear(HTTP_req, REQ_BUF_SZ);
          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;
        }
      }
    }
    // give the web browser time to receive the data
    delay(30);
    // clientose the connection:
    client.stop();
    client.flush();
  }
}

void StrClear(char *str, char length) {

  for (int i = 0; i < length; i++) {
    str [i]= 0;
  }
}

char StrContains(char *str, char *sfind)
{
  char found = 0;
  char index = 0;
  char len;

  len = strlen(str);

  if (strlen(sfind) > len) {
    return 0;
  }
  while (index < len) {
    if (str [index]== sfind[found]) {
      found++;
      if (strlen(sfind) == found) {
        return 1;
      }
    }
    else {
      found = 0;
    }
    index++;
  }
  return 0;
}

void sd_init() {
  Serial.println("Starting SD initiations...");
  byte step_init = 0;
  if (SD.begin(4)) {
    Serial.println("Chip select done");
    step_init++;
  } else {
    Serial.println("Chip selecting failed");
    return;
  }
  Serial.print("Searching index.htm... ");
  if (SD.exists("index.htm")) {
    Serial.println("Found");
    step_init++;
  }
  else {
    Serial.println("Not Found - ERROR");
  }
  Serial.print("Searching UI.css... ");
  if (SD.exists("UI.css")) {
    Serial.println("Found");
    step_init++;
  }
  else  {
    Serial.println("Not Found - ERROR");
  }
  Serial.print("Searching script.js... ");
  if (SD.exists("script.js")) {
    Serial.println("Found");
    step_init++;
  }
  else  {
    Serial.println("Not Found - ERROR");
  }
  if (step_init == 4) {
    Serial.println ("SD card init DONE");
  }
  else {
    Serial.print("SD init FAILED");
  }
}