#define ENTRIES 30
#define BUFFER_SIZE 512

char buffer[BUFFER_SIZE];
String entries[ENTRIES] = { "" };
bool done = false;

String randStr(int len) {
  String output = "";
  for (int i=0; i<len; i++) {
    char c = random(32, 126);
    output += c;
  }
  return output;
}

void setup() { 
  Serial1.begin(115200);
  Serial1.println("");
  
  buffer[0] = '\0';
  char tmp[6] = {'\0'};

  for (int nt = 0; nt < ENTRIES; nt++) {
    sprintf(tmp, "%02d:|||||||||||||||||||||||\n", (nt+1));
    strcat(buffer, tmp);
  }
  Serial1.println(buffer);
  /*
  for (int nt = 0; nt < ENTRIES; nt++) {
    sprintf(tmp, "%02d=$|", (nt+1));
    strcat(buffer, tmp);
    for (int ln = 0; ln < 24; ln++) {
      sprintf(tmp, "%02d\\$|", ((ln+6)%24));
      strcat(buffer, tmp);
    }
    strcat(buffer,"\n");
  }
  Serial1.println("BUF:");
  Serial1.println(buffer);
  while (1);
  */
  
  /*
  String output = "";
  for (int nt = 0; nt < ENTRIES; nt++) {
    output += ((i < 9)?"0":"")+String(i+1)+":";
    for (int ln = 0; ln < 24; ln++) {
      char tm[6] = {'\0'};
      int clk = (ln+6)%24;
      Serial1.print("clk: ");
      Serial1.println(clk);
      sprintf(line, "%02d:00", ln);
    }
  }
  */
  //for (int i = 0; i<ENTRIES; i++) entries[i] = ((i < 9)?"0":"")+String(i+1)+":";
}

void checkData() {
  String output = "";
  for (int i = 0; i<ENTRIES; i++) {
    if (entries[i].length())
      output += entries[i]+"\n";
    //Serial1.print(i); Serial1.print(" -> len: "); Serial1.println(entries[i].length())
  }
  Serial1.print("DATA (len: ");
  Serial1.print(output.length());
  Serial1.println("):'");
  Serial1.print(output);
  Serial1.println("'\n");
}

void loop() {
  String s, n;
  int index = 0;

  while (!Serial1.available()) delay(1);

  s = Serial1.readStringUntil('\n');
  s.trim();

  if (s.startsWith("EXIT")) {
    checkData();
    done = true;
  }
  else {
    n = s.substring(0,s.indexOf(' '));
    s = s.substring(s.indexOf(' ')+1, s.length()); 
    index = n.toInt();
    
    if (index >= 0 && index < ENTRIES) {
      if (!done) { // WRITE MODE
        if (s.length()) {
          n = entries[index];
          entries[index] = (
            ((index < 9)?"0":"") + 
            String(index+1) + ":" + 
            n.substring(n.indexOf(':')+1, n.length()) + 
            s + "|");
        }
        Serial1.print(index); Serial1.print(" -> "); Serial1.println(entries[index]); Serial1.println();
      }
      else { // READ MODE
        int i = 0;
        n = entries[index];
        n = n.substring(n.indexOf(':')+1, n.length());

        Serial1.print(index); Serial1.print(" -> "); Serial1.println(n);
        
        while (n.indexOf('|') != -1) {
          Serial1.print("> "); 
          Serial1.println(n.substring(0, n.indexOf('|')));
          n = n.substring(n.indexOf('|')+1, n.length());
        }
      }
    }
  }
  delay(1);
}