Musical Notes Quiz Game

#include <Arduino.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <XPT2046_Touchscreen.h>

// ESP32 DevKit v1 + ILI9341/XPT2046. Use 3.3 V only.
#define TFT_CS 14
#define TFT_DC 26
#define TFT_RST 27
#define TOUCH_CS 25
#define SPI_SCK 18
#define SPI_MISO 19
#define SPI_MOSI 23


// Hoisted type definitions
struct Move { int8_t fr,fc,tr,tc,cr,cc; bool capture; };


// Forward declarations
bool inside(int r,int c);
bool mine(int8_t p,int side);
void addMove(int fr,int fc,int tr,int tc,int cr,int cc);
void resetBoard();
void pieceMoves(int r,int c,int side,bool capturesOnly);
void legalMoves(int side,int onlyR,int onlyC);
void execute(Move m);
void drawBoard();
void showMenu();
int scorePosition();
int evaluateMove(Move m);
void computerTurn();
void handleBoardTouch(int x,int y);
bool readTouch(int &x,int &y);

Adafruit_ILI9341 tft(TFT_CS, TFT_DC, TFT_RST);
XPT2046_Touchscreen touch(TOUCH_CS);
const int N=8, SQ=27, BX=4, BY=22;
const uint16_t LIGHT=0xF79E, DARK=0x7A22, BLUE=0x001F, RED=0xD104;
int8_t board[N][N]; // + player, - AI; magnitude 2 = king
int selectedR=-1,selectedC=-1,chainR=-1,chainC=-1,difficulty=0;
bool menu=true,humanTurn=true,finished=false;
char statusText[42]="Choose difficulty";

Move moves[96]; int moveCount=0;

bool inside(int r,int c){return r>=0&&r<N&&c>=0&&c<N;}
bool mine(int8_t p,int side){return p!=0&&((p>0)==(side>0));}
void addMove(int fr,int fc,int tr,int tc,int cr=-1,int cc=-1){if(moveCount<96)moves[moveCount++]={(int8_t)fr,(int8_t)fc,(int8_t)tr,(int8_t)tc,(int8_t)cr,(int8_t)cc,cr>=0};}

void resetBoard(){
  memset(board,0,sizeof(board));
  for(int r=0;r<3;r++)for(int c=0;c<N;c++)if((r+c)&1)board[r][c]=-1;
  for(int r=5;r<N;r++)for(int c=0;c<N;c++)if((r+c)&1)board[r][c]=1;
  selectedR=selectedC=chainR=chainC=-1; humanTurn=true;finished=false;
  strcpy(statusText,"Your turn: touch blue piece");
}

// Prototype Thai draughts rules: forced captures, chained captures, promotion.
// Men move forward, but may capture in all four diagonal directions.
void pieceMoves(int r,int c,int side,bool capturesOnly){
  int p=board[r][c]; if(!mine(p,side))return;
  const int d[4][2]={{-1,-1},{-1,1},{1,-1},{1,1}};
  if(abs(p)==1){
    for(int i=0;i<4;i++){int mr=r+d[i][0],mc=c+d[i][1],tr=r+2*d[i][0],tc=c+2*d[i][1];if(inside(mr,mc)&&inside(tr,tc)&&mine(board[mr][mc],-side)&&board[tr][tc]==0)addMove(r,c,tr,tc,mr,mc);}
    if(!capturesOnly){int dr=side>0?-1:1;for(int dc=-1;dc<=1;dc+=2)if(inside(r+dr,c+dc)&&board[r+dr][c+dc]==0)addMove(r,c,r+dr,c+dc);}
  }else{
    for(int i=0;i<4;i++){int rr=r+d[i][0],cc=c+d[i][1];while(inside(rr,cc)&&board[rr][cc]==0){if(!capturesOnly)addMove(r,c,rr,cc);rr+=d[i][0];cc+=d[i][1];}if(inside(rr,cc)&&mine(board[rr][cc],-side)){int tr=rr+d[i][0],tc=cc+d[i][1];if(inside(tr,tc)&&board[tr][tc]==0)addMove(r,c,tr,tc,rr,cc);}}
  }
}
void legalMoves(int side,int onlyR=-1,int onlyC=-1){
  moveCount=0;
  if(onlyR>=0)pieceMoves(onlyR,onlyC,side,true);else for(int r=0;r<N;r++)for(int c=0;c<N;c++)pieceMoves(r,c,side,true);
  if(moveCount||onlyR>=0)return; // capture is compulsory
  for(int r=0;r<N;r++)for(int c=0;c<N;c++)pieceMoves(r,c,side,false);
}
void execute(Move m){int p=board[m.fr][m.fc];board[m.fr][m.fc]=0;board[m.tr][m.tc]=p;if(m.capture)board[m.cr][m.cc]=0;if(p==1&&m.tr==0)board[m.tr][m.tc]=2;if(p==-1&&m.tr==7)board[m.tr][m.tc]=-2;}

void drawBoard(){
  tft.fillScreen(ILI9341_BLACK);tft.fillRect(0,0,320,19,ILI9341_NAVY);tft.setTextSize(1);tft.setTextColor(ILI9341_WHITE);tft.setCursor(5,5);tft.print("THAI DRAUGHTS  AI: ");tft.print(difficulty==0?"EASY":difficulty==1?"MEDIUM":"HARD");
  for(int r=0;r<N;r++)for(int c=0;c<N;c++){int x=BX+c*SQ,y=BY+r*SQ;tft.fillRect(x,y,SQ,SQ,((r+c)&1)?DARK:LIGHT);if(r==selectedR&&c==selectedC)tft.drawRect(x+1,y+1,SQ-2,SQ-2,ILI9341_YELLOW);int p=board[r][c];if(p){tft.fillCircle(x+SQ/2,y+SQ/2,9,p>0?BLUE:RED);tft.drawCircle(x+SQ/2,y+SQ/2,9,ILI9341_WHITE);if(abs(p)==2){tft.setTextColor(ILI9341_YELLOW);tft.setCursor(x+11,y+9);tft.print("K");}}}
  if(selectedR>=0){legalMoves(1,chainR>=0?chainR:selectedR,chainC>=0?chainC:selectedC);for(int i=0;i<moveCount;i++)if(moves[i].fr==selectedR&&moves[i].fc==selectedC)tft.fillCircle(BX+moves[i].tc*SQ+SQ/2,BY+moves[i].tr*SQ+SQ/2,3,ILI9341_GREEN);}
  tft.fillRect(0,226,320,14,ILI9341_BLACK);tft.setTextColor(ILI9341_WHITE);tft.setCursor(3,229);tft.print(statusText);
}
void showMenu(){
  tft.fillScreen(ILI9341_NAVY);tft.setTextColor(ILI9341_WHITE);tft.setTextSize(2);tft.setCursor(45,20);tft.print("THAI DRAUGHTS");tft.setTextSize(1);tft.setCursor(27,48);tft.print("Choose AI difficulty");
  const uint16_t col[3]={ILI9341_GREEN,ILI9341_ORANGE,ILI9341_RED};const char* lab[3]={"EASY - random legal move","MEDIUM - capture and score","HARD - best board score"};
  for(int i=0;i<3;i++){int y=72+i*45;tft.fillRoundRect(20,y,280,34,6,col[i]);tft.setTextColor(ILI9341_BLACK);tft.setCursor(34,y+12);tft.print(lab[i]);}tft.setTextColor(ILI9341_WHITE);tft.setCursor(22,215);tft.print("Blue: student  Red: AI");
}
int scorePosition(){int s=0;for(int r=0;r<N;r++)for(int c=0;c<N;c++){int p=board[r][c];if(p<0)s+=(abs(p)==2?180:100);if(p>0)s-=(abs(p)==2?180:100);}return s;}
int evaluateMove(Move m){int8_t a=board[m.fr][m.fc],b=board[m.tr][m.tc],cap=m.capture?board[m.cr][m.cc]:0;execute(m);int s=scorePosition();board[m.fr][m.fc]=a;board[m.tr][m.tc]=b;if(m.capture)board[m.cr][m.cc]=cap;return s;}
void computerTurn(){
  legalMoves(-1);if(!moveCount){finished=true;strcpy(statusText,"You win! Touch for menu");drawBoard();return;}int pick=random(moveCount);
  if(difficulty>0){int best=-32000;for(int i=0;i<moveCount;i++){int v=evaluateMove(moves[i])+(moves[i].capture?40:0);if(v>best){best=v;pick=i;}}}
  Move m=moves[pick];execute(m);while(m.capture){legalMoves(-1,m.tr,m.tc);if(!moveCount)break;int q=0,best=-32000;for(int i=0;i<moveCount;i++){int v=evaluateMove(moves[i]);if(v>best){best=v;q=i;}}m=moves[q];execute(m);}humanTurn=true;selectedR=selectedC=-1;strcpy(statusText,"Your turn: touch blue piece");drawBoard();
}
void handleBoardTouch(int x,int y){
  if(finished){menu=true;showMenu();return;}if(!humanTurn||y<BY||y>=BY+8*SQ||x<BX||x>=BX+8*SQ)return;int r=(y-BY)/SQ,c=(x-BX)/SQ;
  if(selectedR<0){if(mine(board[r][c],1)){if(chainR>=0&&(r!=chainR||c!=chainC))return;selectedR=r;selectedC=c;strcpy(statusText,"Touch green dot to move");drawBoard();}return;}
  legalMoves(1,chainR>=0?chainR:selectedR,chainC>=0?chainC:selectedC);for(int i=0;i<moveCount;i++)if(moves[i].fr==selectedR&&moves[i].fc==selectedC&&moves[i].tr==r&&moves[i].tc==c){Move m=moves[i];execute(m);selectedR=selectedC=-1;if(m.capture){legalMoves(1,m.tr,m.tc);if(moveCount){chainR=m.tr;chainC=m.tc;selectedR=m.tr;selectedC=m.tc;strcpy(statusText,"Forced capture: continue");drawBoard();return;}}chainR=chainC=-1;legalMoves(-1);if(!moveCount){finished=true;strcpy(statusText,"You win! Touch for menu");drawBoard();return;}humanTurn=false;strcpy(statusText,"AI thinking...");drawBoard();delay(250);computerTurn();return;}
  if(mine(board[r][c],1)&&chainR<0){selectedR=r;selectedC=c;drawBoard();}
}
bool readTouch(int &x,int &y){if(!touch.touched())return false;TS_Point p=touch.getPoint();x=constrain(map(p.y,300,3800,0,320),0,319);y=constrain(map(p.x,250,3850,0,240),0,239);delay(120);return true;}
void setup(){randomSeed(esp_random());SPI.begin(SPI_SCK,SPI_MISO,SPI_MOSI);tft.begin();tft.setRotation(1);touch.begin();touch.setRotation(1);showMenu();}
void loop(){int x,y;if(!readTouch(x,y))return;if(menu){if(y>=72&&y<207){difficulty=(y-72)/45;menu=false;resetBoard();drawBoard();}}else handleBoardTouch(x,y);}