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#include <stdio.h>

\#define WIDTH 80
#define HEIGHT 25
#define PADDLE_HEIGHT 3
#define WIN_SCORE 21

typedef struct {
    int x, y;
} Paddle;

typedef struct {
    int x, y;
    int dx, dy;
} Ball;

typedef struct {
    int score1, score2;
    Paddle p1, p2;
    Ball ball;
} GameState;

void init_game(GameState *game);
void draw_board(const GameState *game);
void player_input(GameState *game);
void update_ball(GameState *game);
int check_winner(const GameState *game);
void draw_winner(int player);

int main(void) {
    GameState game;
    init_game(&game);

    while (!check_winner(&game)) {
        draw_board(&game);
        player_input(&game);
        update_ball(&game);
    }

    draw_winner(check_winner(&game));
    return 0;
}


void init_game(GameState *game) {
    game->score1 = 0;
    game->score2 = 0;

    game->p1.x = 1;
    game->p2.x = WIDTH - 2;

    game->p1.y = (HEIGHT - PADDLE_HEIGHT) / 2;
    game->p2.y = (HEIGHT - PADDLE_HEIGHT) / 2;

    game->ball.x = WIDTH / 2;
    game->ball.y = HEIGHT / 2;
    game->ball.dx = 1;
    game->ball.dy = 1;
}

void draw_board(const GameState *game) {
    // ANSI clear screen (allowed, not a system call)
    printf("\033[2J\033[H");

    printf("Player 1: %d", game->score1);
    printf("%*s", WIDTH - 20, "");
    printf("Player 2: %d\n", game->score2);

    for (int y = 0; y < HEIGHT; y++) {
        for (int x = 0; x < WIDTH; x++) {
            if (y == 0 || y == HEIGHT - 1) {
                putchar('#');
            } else if (x == game->p1.x && y >= game->p1.y && y < game->p1.y + PADDLE_HEIGHT) {
                putchar('|');
            } else if (x == game->p2.x && y >= game->p2.y && y < game->p2.y + PADDLE_HEIGHT) {
                putchar('|');
            } else if (x == game->ball.x && y == game->ball.y) {
                putchar('O');
            } else {
                putchar(' ');
            }
        }
        putchar('\n');
    }
}

void player_input(GameState *game) {
    char c;

    do {
        c = getchar();
    } while (c == '\n');

    const int MIN_Y = 1;
    const int MAX_Y = HEIGHT - 2 - PADDLE_HEIGHT;

    if (c == ' ') return;

    if ((c == 'a' || c == 'A') && game->p1.y > MIN_Y)
        game->p1.y--;
    else if ((c == 'z' || c == 'Z') && game->p1.y < MAX_Y)
        game->p1.y++;

    else if ((c == 'k' || c == 'K') && game->p2.y > MIN_Y)
        game->p2.y--;
    else if ((c == 'm' || c == 'M') && game->p2.y < MAX_Y)
        game->p2.y++;
}

void update_ball(GameState *game) {
    game->ball.x += game->ball.dx;
    game->ball.y += game->ball.dy;

    if (game->ball.y <= 1 || game->ball.y >= HEIGHT - 2) {
        game->ball.dy = -game->ball.dy;
    }

    if (game->ball.dx < 0 && game->ball.x == game->p1.x + 1 && game->ball.y >= game->p1.y &&
        game->ball.y < game->p1.y + PADDLE_HEIGHT) {
        game->ball.dx = -game->ball.dx;
    }

    if (game->ball.dx > 0 && game->ball.x == game->p2.x - 1 && game->ball.y >= game->p2.y &&
        game->ball.y < game->p2.y + PADDLE_HEIGHT) {
        game->ball.dx = -game->ball.dx;
    }

    if (game->ball.x <= 0) {
        game->score2++;
    } else if (game->ball.x >= WIDTH - 1) {
        game->score1++;
    } else {
        return;
    }

    game->ball.x = WIDTH / 2;
    game->ball.y = HEIGHT / 2;
    game->ball.dx = (game->ball.dx > 0) ? -1 : 1;
    game->ball.dy = 1;
}

int check_winner(const GameState *game) {
    if (game->score1 >= WIN_SCORE) return 1;
    if (game->score2 >= WIN_SCORE) return 2;
    return 0;
}

void draw_winner(int player) {
    printf("\033[2J\033[H\n");
    printf("Player %d wins!\n", player);
}

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