#include <LiquidCrystal.h>

/*
This program was adapted from electronicsbug.wordpress.com

I could not find the Random number library as suggested in this code
so I utilized the Arduino C++ Random function in its place. Also added in was
Ratary Encoder and LCD modules

DuinoKit.com
*/


#define ENC_A 8
#define ENC_B 9
#define ENC_PORT PINB

LiquidCrystal lcd(A0, A1, A2, A3, A4, A5);
// (RS,E, D4, D5, D6, D7)
int computerNumber;
int lastGuess;
boolean inGame;

void setup()
{
Serial.begin(9600);
lcd.begin(16, 2);
pinMode(ENC_A, INPUT);
digitalWrite(ENC_A, HIGH);
pinMode(ENC_B, INPUT);
digitalWrite(ENC_B, HIGH);
inGame = false;
digitalWrite(6,HIGH); // Set pin 6 HIGH for press of rotary encoder
}

void loop ()
{

while(!inGame)
{
Serial.println("Guessing Game");
Serial.println("The computer has picked a number between 1 and 100");
lcd.setCursor(0, 0);
lcd.print("The computer has picked a number between 1 and 100");
Serial.println("Send anything to start the game");
lcd.setCursor(0, 1);
lcd.print("Send anything to start the game");
randomSeed(analogRead(0));
while(digitalRead(6) == HIGH) {
} // Wait for user to enter somehting in serial

computerNumber = random(0, 99)+1 ; // Get random number here
delay(300);
inGame = true;

}

while(inGame)
{
while(Serial.available() > 0)
{
delay(100);
Serial.read (); // read value from serial

}
Serial.println("Please enter a guess...");
while(digitalRead(6) == HIGH) {




static uint8_t counter = 0; //this variable will be changed by encoder input
int8_t tmpdata;
/**/
tmpdata = read_encoder();

int MapValue;
if( tmpdata ) {
// Serial.print("Counter value: ");
// Serial.print(counter, DEC);
// Serial.print(" value: ");

lastGuess=map(counter,0,150,0,100);
Serial.print(lastGuess, DEC);
Serial.print(" ");

counter += tmpdata;
}

}

// lastGuess = Serial.read()-48;
delay(300);
// if(Serial.available() >0)
// {
// lastGuess=lastGuess *10 + Serial.read()-48;
// delay(100);
// if(Serial.available() >0)
// {
// lastGuess = lastGuess * 10 + Serial.read()-48;
// }
// }

if(lastGuess <1 || lastGuess > 100)
{
Serial.println("Invalid entry, pleast try again");
return;
}

Serial.println("");
Serial.print(lastGuess);
if(lastGuess == computerNumber)
{

Serial.println(" was correct. You Win!");
inGame=false ;
}

else if (lastGuess < computerNumber)
{
Serial.println (" is too low");
}


else if (lastGuess > computerNumber)
{
Serial.println(" is too high") ;

}

}


}


/* returns change in encoder state (-1,0,1) */
int8_t read_encoder()
{
static int8_t enc_states[] = {
0,-1,1,0,1,0,0,-1,-1,0,0,1,0,1,-1,0 };
static uint8_t old_AB = 0;
/**/
old_AB <<=2 ; //remember previous state
old_AB |= ( ENC_PORT & 0x03 ); //add current state
return ( enc_states[( old_AB & 0x0f )]);
}