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

int CS_PIN = 53;
String chname[20];
File file;

void setup()
{

 Serial.begin(9600);

 initializeSD();
 pinMode(CS_PIN, OUTPUT);
 createFile("test.txt");
 writeToFile("AIR Trivandrum\n Tested OK...\nL:AIR Trivandrum\nR:AIR Trivandrum\nL:DELHI Gold\nR:DELHI Gold\nL:DLC 9\nR:DLC 10\nL:Vividbharathi\nR:Vividbharathi\nL:DELHI Rainbow\nR:DELHI Rainbow\nL:DLC 2\nR:DLC 2\nL:DLC 9\nR:DLC 10\nL:DLC 3\nR:DLC 4");
 closeFile();

 openFile("test.txt");
 readLine();
 Serial.println(chname[0]);
 Serial.println(chname[1]);
 Serial.println(chname[2]);
 Serial.println(chname[3]);
 Serial.println(chname[4]);
 Serial.println(chname[5]);
 Serial.println(chname[6]);
 Serial.println(chname[7]);
 Serial.println(chname[8]);
 Serial.println(chname[9]);
 Serial.println(chname[10]);
 Serial.println(chname[11]);
 Serial.println(chname[12]);
 Serial.println(chname[13]);
 Serial.println(chname[14]);
 Serial.println(chname[15]);
 Serial.println(chname[16]);
 Serial.println(chname[17]);
 Serial.println(chname[18]);

 closeFile();
}

void loop()
{
}

void initializeSD()
{
 Serial.println("Initializing SD card...");
 pinMode(CS_PIN, OUTPUT);

 if (SD.begin())
 {
   Serial.println("SD card is ready to use.");
 } else
 {
   Serial.println("SD card initialization failed");
   return;
 }
}

int createFile(char filename[])
{
 file = SD.open(filename, FILE_WRITE);

 if (file)
 {
   Serial.println("File created successfully.");
   return 1;
 } else
 {
   Serial.println("Error while creating file.");
   return 0;
 }
}

int writeToFile(char text[])
{
 if (file)
 {
   file.println(text);
   Serial.println("Writing to file: ");
  // Serial.println(text);
   return 1;
 } else
 {
   Serial.println("Couldn't write to file");
   return 0;
 }
}

void closeFile()
{
 if (file)
 {
   file.close();
   Serial.println("File closed");
 }
}

int openFile(char filename[])
{
 file = SD.open(filename);
 if (file)
 {
   Serial.println("File opened with success!");
   return 1;
 } else
 {
   Serial.println("Error opening file...");
   return 0;
 }
}

String readLine()
{
// String received = "";
 char ch;
 int i=0;
 while (file.available())
 {
   ch = file.read();
   if (ch == '\n')
   {
     i++;
   
     if (i >= 19)
     {
      return;
     }
   }
   else
   {
     chname[i] += ch;
   }
 }
}