#include "raylib.h"

#define KEY_KP_8 328
#define KEY_KP_2 322

#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 400

#define INITIAL_BALL_SPEED 2.0
#define INITIAL_PADDLE_SPEED 6.0

typedef struct Ball {

    // Speed of the ball
    float speed;

    // Position of the ball
    Vector2 position;

    // Direction of the ball
    Vector2 direction;

    // Size of the ball
    float size;

    // Color of the ball
    Color color;

    // Is the ball active
    bool active;

} Ball;

typedef struct Paddle {

    // Speed of the paddle
    float speed;

    // Position and Size of the paddle
    Rectangle rect;

    // Color of the paddle
    Color color;

    // Is the paddle active
    bool active;

    // Title position
    Vector2 titlePosition;

    // Score position
    Vector2 scorePosition;

    // Score
    int score;

} Paddle;

//------------------------------------------------------------------------------------
// Global Variables Declaration
//------------------------------------------------------------------------------------
static Ball ball;
static Paddle player1;
static Paddle player2;
static SpriteFont font;
const char player1Name[64] = "Player 1";
const char player2Name[64] = "Player 2";

//------------------------------------------------------------------------------------
// Module Functions Declaration (local)
//------------------------------------------------------------------------------------
static void InitGame(void);         // Initialize game
static void UpdateGame(void);       // Update game (one frame)

int main()
{

    InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "Simple pong Game");

    InitGame();

    SetTargetFPS(60);

    while(!WindowShouldClose())
    {

        UpdateGame();
        BeginDrawing();
        ClearBackground(BLACK);

        // Draw the middle line
        DrawLineEx((Vector2){ SCREEN_WIDTH / 2, 10.0f }, (Vector2){ SCREEN_WIDTH / 2, SCREEN_HEIGHT - 10.0f}, 5.0f, DARKGRAY);


        // Draw Player 1 HUD
        DrawTextEx(font, player1Name, player1.titlePosition, font.baseSize*1.0f, 2, player1.color);
        DrawTextEx(font, FormatText("%01i", player1.score), player1.scorePosition, font.baseSize*1.0f, 2, player1.color);

        // Draw Player 2 HUD
        DrawTextEx(font, player2Name, player2.titlePosition, font.baseSize*1.0f, 2, player2.color);
        DrawTextEx(font, FormatText("%01i", player2.score), player2.scorePosition, font.baseSize*1.0f, 2, player2.color);

        // Draw the ball
        DrawCircleV(ball.position, ball.size, ball.color);

        // Draw players
        DrawRectangleRec(player1.rect, player1.color);
        DrawRectangleRec(player2.rect, player2.color);

        EndDrawing();
    }

    CloseWindow();

    return 0;
}

static void InitGame(void)
{

    // Initialize the ball
    ball.position.x = SCREEN_WIDTH / 2;
    ball.position.y = SCREEN_HEIGHT / 2;
    ball.direction.x = -1.0f;
    ball.direction.y = 1.0f;
    ball.size = 10;
    ball.speed = INITIAL_BALL_SPEED;
    ball.color = WHITE;
    ball.active = false;


    // Initialize the player 1
    player1.rect.x = 10;
    player1.rect.y = 160;
    player1.rect.width = 10;
    player1.rect.height = 80;
    player1.speed = INITIAL_PADDLE_SPEED;
    player1.color = BLUE;
    player1.active = false;
    player1.titlePosition.x = (SCREEN_WIDTH / 4) - 84.5;
    player1.titlePosition.y = 35.0f;
    player1.scorePosition.x = (SCREEN_WIDTH / 4) - 9.5;
    player1.scorePosition.y = 65.0f;
    player1.score = 0;


    // Initialize the player 2
    player2.rect.x = 620;
    player2.rect.y = 160;
    player2.rect.width = 10;
    player2.rect.height = 80;
    player2.speed = INITIAL_PADDLE_SPEED;
    player2.color = YELLOW;
    player2.active = false;
    player2.titlePosition.x = ((SCREEN_WIDTH / 4) * 3) - 84.5;
    player2.titlePosition.y = 35.0f;
    player2.scorePosition.x = ((SCREEN_WIDTH / 4) * 3) - 9.5;
    player2.scorePosition.y = 65.0f;
    player2.score = 0;


    // Initialize the font
    font = LoadSpriteFont("assets/fonts/3Dventure.ttf");

}

static void UpdateGame(void)
{
    // Ball movements
    ball.position.x += ball.direction.x * ball.speed;
    ball.position.y += ball.direction.y * ball.speed;

    // Flip when hitting top or bottom
    if((ball.position.y  < (ball.size / 2)) || (ball.position.y > (SCREEN_HEIGHT - (ball.size / 1))))
        ball.direction.y = -ball.direction.y;


    // Collision between ball and paddle
    if((CheckCollisionCircleRec(ball.position, ball.size, player1.rect)) || (CheckCollisionCircleRec(ball.position, ball.size, player2.rect))){
        ball.direction.x = -ball.direction.x;
        ball.speed *= 1.1; //
    }


    // Player 1 movements
    if(IsKeyDown(KEY_UP) && player1.rect.y > 10)
        player1.rect.y -= player1.speed;
    if(IsKeyDown(KEY_DOWN) && player1.rect.y < SCREEN_HEIGHT - player1.rect.height - 10)
        player1.rect.y += player1.speed;


    // Player 2 movements
    if(IsKeyDown(KEY_KP_8) && player2.rect.y > 10)
        player2.rect.y -= player2.speed;
    if(IsKeyDown(KEY_KP_2) && player2.rect.y < SCREEN_HEIGHT - player2.rect.height - 10)
        player2.rect.y += player2.speed;


    // If player 1 score
    if(ball.position.x > SCREEN_WIDTH) {
        player1.score++;
        ball.speed = INITIAL_BALL_SPEED;
        ball.position.x = SCREEN_WIDTH / 2;
        ball.position.y = SCREEN_HEIGHT / 2;
        ball.direction.x = -1.0f;
        ball.direction.y = 1.0f;
    }

    // If player 2 score
    if(ball.position.x < 0) {
        player2.score++;
        ball.speed = INITIAL_BALL_SPEED;
        ball.position.x = SCREEN_WIDTH / 2;
        ball.position.y = SCREEN_HEIGHT / 2;
        ball.direction.x = -1.0f;
        ball.direction.y = 1.0f;
    }
}