#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <time.h>
#include<unistd.h>
#include<stdbool.h>
#define SCREEN_WIDTH 11
#define SCREEN_HEIGHT 10
#define PADDLE_SIZE 1
#define SLEEP_TIME_MS 100 * 1000
#define PADDLE_HEIGHT SCREEN_HEIGHT-1
#define Y_BLOCK_LAYERS 4
#define X_BLOCK_LAYERS SCREEN_WIDTH

uint8_t screen[SCREEN_WIDTH][SCREEN_HEIGHT];

enum PIXEL_TYPE {
    PIXEL_EMPTY=0u,
    PIXEL_BALL=1u,
    PIXEL_BLOCK=2u,
    PIXEL_PADDLE=3u
} PIXEL_TYPE;

void clearScreen() {
    for (int y = 0; y < SCREEN_HEIGHT; y++) {
        for (int x=0; x<SCREEN_WIDTH; x++) {
            screen[x][y]=PIXEL_EMPTY;
        }
    }
    printf("\e[1;1H\e[2J");//clear the screen of the prev frame
}



typedef struct ballStruct {
    uint8_t xPOS;
    uint8_t yPOS;
    int8_t xVEL;
    int8_t yVEL;
} Ball_t;

struct Paddle {
    uint8_t location;
    uint8_t paddleSize;
} paddle= {.location=(SCREEN_WIDTH/2),.paddleSize=PADDLE_SIZE};

typedef struct block {
    uint8_t xLocation;
    uint8_t yLocation;
    bool visable;
} Block_t;

bool ballOnXEdge(Ball_t ball){
    if(ball.xPOS==0) return true;
    if (ball.xPOS==SCREEN_WIDTH-1) return true;
    return false;
}

int main() {
    Ball_t ball = {.xPOS=0,.yPOS=0,.xVEL=0,.yVEL=0};
    time_t UNIXTIME = time(NULL);
    srand(UNIXTIME); //seed random number with time at run time
    Block_t blockArr[X_BLOCK_LAYERS][Y_BLOCK_LAYERS];
    bool blockFlushHit = false; //used to show if the ball has hit a block vertically or horizontally

    //init blockArr array
    for (int x=0; x< X_BLOCK_LAYERS; x++) {
        for (int y=0; y<Y_BLOCK_LAYERS; y++) {
            blockArr[x][y]=(Block_t) {
                .xLocation =x,.yLocation=y,.visable=true
            };
        }
    }

    ball.xPOS=rand()% SCREEN_WIDTH;
    ball.yPOS= rand()% SCREEN_HEIGHT;
    ball.xVEL=1;
    ball.yVEL=1;
    while(true) {
        usleep(SLEEP_TIME_MS);
        clearScreen();
        blockFlushHit = false;

        //draw blocks
        for (int x = 0; x<X_BLOCK_LAYERS; x++) {
            for (int y =0; y<Y_BLOCK_LAYERS; y++) {
                if(blockArr[x][y].visable==true) {
                    screen[x][y]=PIXEL_BLOCK;
                }
            }
        }

        //draw paddel
        screen[paddle.location][PADDLE_HEIGHT]=PIXEL_PADDLE;
        for(int x= 0; x<=PADDLE_SIZE; x++) {
            screen[paddle.location-x][PADDLE_HEIGHT]=PIXEL_PADDLE;
            screen[paddle.location+x][PADDLE_HEIGHT]=PIXEL_PADDLE;
        }
        //draw ball
        screen[ball.xPOS][ball.yPOS]=PIXEL_BALL;

        //render step
        for (int x =0; x<=SCREEN_WIDTH; x++) {
            printf("--");   //top border
        }
        printf("\n");
        for (int y = 0; y < SCREEN_HEIGHT; y++) {
            printf("|");
            for (int x=0; x<SCREEN_WIDTH; x++) {
                if (screen[x][y]==PIXEL_EMPTY) {
                    printf("  ");
                } else if (screen[x][y]==PIXEL_BALL) {
                    printf("<>");
                } else if(screen[x][y]==PIXEL_PADDLE) {
                    printf("==");
                } else if(screen[x][y]==PIXEL_BLOCK) {
                    printf("[]");
                }
            }
            printf("|\n");
        }
        for (int x =0; x<=SCREEN_WIDTH; x++) {
            printf("--");
        }
        printf("\n");

        //detect when ball hits the edge of the screen
        if (ball.xPOS==0||ball.xPOS==(SCREEN_WIDTH-1)) {
            ball.xVEL=ball.xVEL*-1;
        }
        if (ball.yPOS==0||ball.yPOS==(SCREEN_HEIGHT-1)) {
            ball.yVEL=ball.yVEL*-1;
        }
        //detect when ball hits a block
        if (screen[ball.xPOS+ball.xVEL][ball.yPOS]==PIXEL_BLOCK) {
            blockArr[ball.xPOS+ball.xVEL][ball.yPOS].visable=false;
            ball.xVEL = ball.xVEL *-1;
            blockFlushHit=true;
        }
        if (screen[ball.xPOS][ball.yPOS+ball.yVEL]==PIXEL_BLOCK) {
            blockArr[ball.xPOS][ball.yPOS+ball.yVEL].visable=false;
            ball.yVEL = ball.yVEL *-1;
            blockFlushHit=true;
        }
        if (screen[ball.xPOS+ball.xVEL][ball.yPOS+ball.yVEL]==PIXEL_BLOCK&&blockFlushHit==false) {
            blockArr[ball.xPOS+ball.xVEL][ball.yPOS+ball.yVEL].visable=false;
            if(ballOnXEdge(ball)==false) {
                ball.xVEL = ball.xVEL *-1;
            }
            if (ball.yPOS!=0) {
                ball.yVEL=ball.yVEL *-1;
            }
        }

        //detect when ball hits paddle
        if(screen[ball.xPOS+ball.xVEL][ball.yPOS]==PIXEL_PADDLE) {
            ball.xVEL = ball.xVEL *-1;
        }
        if (screen[ball.xPOS][ball.yPOS+ball.yVEL]== PIXEL_PADDLE) { //hit detection y direction
            ball.yVEL= ball.yVEL*-1;
        }
        if (screen[ball.xPOS+ball.xVEL][ball.yPOS+ball.yVEL]==PIXEL_PADDLE) { //diagonal hit detection
            ball.xVEL = ball.xVEL *-1;
            ball.yVEL=ball.yVEL *-1;
        }
        //update ball position
        ball.xPOS=ball.xPOS+ball.xVEL;
        ball.yPOS= ball.yPOS+ball.yVEL;

    }
}