/*
  Showing numbers, chars and phrases
                            A (seg[0] in this project)
                           ---
  F (seg[5] in this project) |   | B (seg[1] in this project)
                          |   |
                           --- G (seg[6] in this project)
  E (seg[4] in this project) |   |
                          |   | C (seg[2] in this project)
                           ---  . dot or dicimal (seg[7] in this project)
                            D (seg[3] in this project)
*/
#define A 11
#define B 10
#define C 9
#define D 8
#define E 7
#define F 6
#define G 5
#define DP 12 // decimal
#define common_cathode 0
#define common_anode 1
bool segMode = common_cathode; // set this to your segment type, my segment is common_cathode
int seg[] {A, B, C, D, E, F, G, DP}; // segment pins
byte chars = 35; // max value in the array "Chars"
byte Chars[35][9] {  // LUT ARRAY
  {48, 1, 1, 1, 1, 1, 1, 0, 0}, //0
  {49, 0, 1, 1, 0, 0, 0, 0, 0}, //1
  {50, 1, 1, 0, 1, 1, 0, 1, 0}, //2
  {51, 1, 1, 1, 1, 0, 0, 1, 0}, //3
  {52, 0, 1, 1, 0, 0, 1, 1, 0}, //4
  {53, 1, 0, 1, 1, 0, 1, 1, 0}, //5
  {54, 1, 0, 1, 1, 1, 1, 1, 0}, //6
  {55, 1, 1, 1, 0, 0, 0, 0, 0}, //7
  {56, 1, 1, 1, 1, 1, 1, 1, 0}, //8
  {57, 1, 1, 1, 1, 0, 1, 1, 0}, //9
  {65, 1, 1, 1, 0, 1, 1, 1, 0}, //A/10
  {98, 0, 0, 1, 1, 1, 1, 1, 0}, //b/11
  {67, 1, 0, 0, 1, 1, 1, 0, 0}, //C/12
  {100, 0, 1, 1, 1, 1, 0, 1, 0}, //d/13
  {69, 1, 0, 0, 1, 1, 1, 1, 0}, //E/14
  {70, 1, 0, 0, 0, 1, 1, 1, 0}, //F/15
  {71, 1, 0, 1, 1, 1, 1, 1, 0}, //G/16
  {72, 0, 1, 1, 0, 1, 1, 1, 0}, //H/17
  {73, 0, 0, 0, 0, 1, 1, 0, 0}, //I/18
  {74, 0, 1, 1, 1, 1, 0, 0, 0}, //J/19
  {76, 0, 0, 0, 1, 1, 1, 0, 0}, //L/20
  {110, 0, 0, 1, 0, 1, 0, 1, 0}, //n/21
  {111, 0, 0, 1, 1, 1, 0, 1, 0}, //o/22
  {80, 1, 1, 0, 0, 1, 1, 1, 0}, //P/23
  {113, 1, 1, 1, 0, 0, 1, 1, 0}, //q/24
  {114, 0, 0, 0, 0, 1, 0, 1, 0}, //r/25
  {83, 1, 0, 1, 1, 0, 1, 1, 0}, //S/26   looks like number 5
  {116, 0, 0, 0, 1, 1, 1, 1, 0}, //t/27
  {85, 0, 1, 1, 1, 1, 1, 0, 0}, //U/28
  {121, 0, 1, 1, 1, 0, 1, 1, 0}, //y/29
  {45, 0, 0, 0, 0, 0, 0, 1, 0}, //-/30
  {46, 0, 0, 0, 0, 0, 0, 0, 1}, //./31
  {93, 1, 1, 1, 1, 0, 0, 0, 0}, //]/32
  {91, 1, 0, 0, 1, 1, 1, 0, 0}, //[/33
  {95, 0, 0, 0, 1, 0, 0, 0, 0}, //_/34
};
void setup() {
  Serial.begin(9600);
  Serial.print("\nPress 1 to display all possible numbers and letters.");
  Serial.print("\nPress 2 followed by space and the ASCII code of the number/letter to display");
  Serial.print("\nPress 3 to print 10 random numbers");
  Serial.print("\nPress 4 followed by space and the number you want to display followed by another space");

  // set segment pins as OUTPUT
  pinMode(seg[0], OUTPUT);
  pinMode(seg[1], OUTPUT);
  pinMode(seg[2], OUTPUT);
  pinMode(seg[3], OUTPUT);
  pinMode(seg[4], OUTPUT);
  pinMode(seg[5], OUTPUT);
  pinMode(seg[6], OUTPUT);
  pinMode(seg[7], OUTPUT);
}
void setState(bool mode) //sets the hole segment state to "mode"
{ for (int i = 0; i <= 6; i++)
  {
    digitalWrite(seg[i], mode);
  }
}
void PrintAscii(int asciiCode) // print any character on the segment ( Note : you can't use capital characters )
{

  int charNum = -1;// set search resault to -1
  setState(segMode);//turn off the segment
  for (int i = 0; i < chars ; i++) { //search for the enterd character
    if (asciiCode == Chars[i][0]) { //if the character found
      charNum = i;//set the resault number into charNum ( because this function prints the character using it's number in the array )
    }
  }
  if (charNum == -1 ) // if the character not found
  {
    for (int i = 0; i <= 6; i++)
    {
      digitalWrite(seg[i], HIGH);
      delay(100);
      digitalWrite(seg[i], LOW);
    }
    for (int i = 0; i <= 2; i++)
    {
      delay(100);
      setState(HIGH);
      delay(100);
      setState(LOW);
    }
  } else // else if the character found print it
  {
    for (int i = 0; i < 8; i++)
    { digitalWrite(seg[i], Chars[charNum][i + 1]);
    }
  }
}
void Print(int num) // print any number on the segment
{
  setState(segMode);//turn off the segment
  if (num > chars || num < 0 ) // if the number is not declared
  {
    for (int i = 0; i <= 6; i++)
    {
      digitalWrite(seg[i], HIGH);
      delay(100);
      digitalWrite(seg[i], LOW);
    }
    for (int i = 0; i <= 2; i++)
    {
      delay(100);
      setState(HIGH);
      delay(100);
      setState(LOW);
    }
  } else // else if the number declared, print it
  {
    if (segMode == 0) { //for segment mode
      for (int i = 0; i < 8; i++) {
        digitalWrite(seg[i], Chars[num][i + 1]);
      }
    }
    else {
      for (int i = 0; i < 8; i++) {
        digitalWrite(seg[i], !Chars[num][i + 1]);
      }
    }
  }

}

void loop() {

  //read from keyboard
  char string[32];
  char byteRead;
  //  char asciiNum[4];
  int availableBytes = Serial.available();
  for (int i = 0; i < availableBytes; i++)
  {
    string[i] = Serial.read();
  }
  //  Serial.println(string);
  delay(1000);

  // assign switchCase
  int randNumber = random(48, 57);
  int switchCase = string[0] - '0';
  int *numArr;
  char asciiNum[4];
  asciiNum[0] = string[2];
  asciiNum[1] = string[3];
  asciiNum[2] = string[4];
  switch (switchCase) {
    case 1:
      //print everything
      for (int i = 0; i < chars; i++) //print
      {
        Print(i);
        Serial.print("\nDisplaying ASCII character with number:");
        Serial.print(Chars[i][0]);
        delay(10);
      }
      break;
    case 2:
      // print number/letter/symbol of each element using the ascii number
      Serial.println(charArrayToInt(asciiNum));
      PrintAscii(charArrayToInt(asciiNum));
      break;
    case 3:
      //print 10 random number;
      numArr = generateNumbers();
      Serial.println("Displaying 10 random numbers");
      for (int i = 0; i < 11; i++) {
        Serial.print("\nDisplaying ASCII character with number:");
        Serial.print(numArr[i]);
        PrintAscii(numArr[i]);
        delay(1000);
      }
      Serial.println("Done");
      break;
    case 4:
      //print number
      Serial.println("\nDisplaying number digit by digit with 2000ms delay");
      for (int i = 2; i < sizeof(string) - 1; i++) {
        if (isDigit(string[i])) {
          Serial.println(0+ string[i]);
          PrintAscii(0+ string[i]);
          delay(2000);
        } else {
          break;
        }
      }
      setState(segMode);
      Serial.println("Done");
      break;
    case 0:
      //default case
      //    Serial.println("Invalid switch case");
      break;
  }

}

int * generateNumbers() {
  static int nuArr[11];
  for (int i = 0; i < 11; i++) {
    nuArr[i] = random(48, 57);
  }
  return nuArr;
}

int charArrayToInt(char *arr) {
  int i, value, r;
  i = value = 0;
  for (i = 0; i < strlen(arr); ++i) {
    r = arr[i] - '0';
    value = value * 10 + r;
  }
  if (value > 121) {
    value = value / 10;
  }
  return value;
}