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#include "Wire.h"
// please write comments in english
//pin selection
int rot=11;  // <- english please
int schwarz=10;  // <- english please
int reset=9;

//paths

//global variables
int path[47];
int num = 0;
int step = 0;
int current_move = 0;
byte inputs = 0;

void setup() {

  // init path
  // first we do a random number between 0 and 47
  // but II think that  is not right
  // theplayer needs to reach the center so we alwys need to make a step
  // you need the numbering and a system how we can select numbers around that number
  // e.g.
  //
  // 1 | 2 | 3
  // —————————
  // 4 | 5 | 6
  // —————————
  // 7 | 8 | 9
  //
  // if we start at 1 we only can select 2,4
  // if we are on 4 we can select 1,5,7 normally we should also not select 5 again
  //
  // This should work for random numbers
  // If you want to loop that path always loop num not the length of the path
  num = random(47);
  for(int i = 0; i < num; i++){
    if (i == 0) path[i] = 1;
    path[i] = random(path[i], 1);
  }

  pinMode(rot,OUTPUT);
  pinMode(schwarz,OUTPUT);
  pinMode(reset,INPUT);

  Serial.begin(9600);
  Wire.begin(); // wake up I2C bus
}

void flipRot() {
  digitalWrite(rot,HIGH);
  digitalWrite(schwarz,LOW);
  delay(10);
  digitalWrite(rot,LOW);
}

void flipSchwarz() {
  digitalWrite(schwarz,HIGH);
  digitalWrite(rot,LOW);
  delay(10);
  digitalWrite(schwarz,LOW);
}

void flicker() {
   for (int i=0; i <= 5; i++){
      flipSchwarz();
      delay(100);
      flipRot();
      delay(100);
   }
}


void getCurrentMove() {
  Wire.beginTransmission(0x20);
  Wire.write(0x12); // set MCP23017 memory pointer to GPIOA address
  Wire.endTransmission();
  Wire.requestFrom(0x20, 1); // request one byte of data from MCP20317
  inputs=Wire.read(); // store the incoming byte into "inputs"
  if (inputs>0) // if a button was pressed
  {
    for(int i = 0; i < 8; i++){
      // See http://arduino.cc/en/Reference/BitRead
      // should work. not tested
      if(bitRead(inputs, i) == 1){
        // do something with the bit
        // you can do something like
        if(i == 0) doSomething();
      }

    }
// please write comments in english
    // gibt current_move einen Wert zwischen 0 und 7, entsprechend dem letzten aktivierten Schalter.
  }
  else
  {
    Wire.beginTransmission(0x20);
    Wire.write(0x13); // set MCP23017 memory pointer to GPIOB address
    Wire.endTransmission();
    Wire.requestFrom(0x20, 1); // request one byte of data from MCP20317
    inputs=Wire.read(); // store the incoming byte into "inputs"
    if (inputs>0) // if a button was pressed
    {
// please write comments in english

      // gibt current_move einen Wert zwischen 8 und 15, entsprechend dem letzten aktivierten Schalter.
    }
    else
    {
      Wire.beginTransmission(0x21);
      Wire.write(0x12); // set MCP23017 memory pointer to GPIOA address
      Wire.endTransmission();
      Wire.requestFrom(0x21, 1); // request one byte of data from MCP20317
      inputs=Wire.read(); // store the incoming byte into "inputs"
      if (inputs>0) // if a button was pressed
      {
// please write comments in english

        // gibt current_move einen Wert zwischen 16 und 23, entsprechend dem letzten aktivierten Schalter.
      }
      else
      {
       // ...
      }
    }
  }
}

void loop() {
  getCurrentMove();
  if (current_move == path[step])
  {
    flipSchwarz();
    step = step+1;
  }
  else if (((step >= 1) && (current_move == path[step-1])) || ((step >= 2) && (current_move == path[step-2])))
  {
    if (step > num)
    {
      flicker();
    }
  }
  else
  {
    flipRot();
    step = 0;
  }

}

void doSomething(){
  Serial.println("o_O");
}