#include "screen.h"

SDL_Window *gWindow = NULL;
SDL_Surface *gScreenSurface = NULL;
SDL_Surface *ballSurface = NULL;
SDL_Surface *leftPaddleSurface = NULL;
SDL_Surface *rightPaddleSurface = NULL;

static const char * const SPRITE_PATH = "sprite.bmp";

static SDL_Surface *LoadSurface(const char * const path) {
    SDL_Surface *optimizedSurface = NULL;
    SDL_Surface * loadedSurface = SDL_LoadBMP(path);
    if (loadedSurface == NULL) {
        printf("Unable to load image %s! SDL Error: %s\n", path, SDL_GetError());
        return NULL;
    }
    optimizedSurface = SDL_ConvertSurface(loadedSurface, gScreenSurface->format, 0);
    if (optimizedSurface == NULL) {
        printf("Unable to optimize image %s! SDL Error: %s\n", path, SDL_GetError());
        return NULL;
    }
    SDL_FreeSurface(loadedSurface);
    return optimizedSurface;
}

bool InitScreen(void) {
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        printf("SDL could not initialize! SDL Error: %s\n", SDL_GetError());
        return false;
    }
    gWindow = SDL_CreateWindow( "Pong", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
                                SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
    if (gWindow == NULL) {
        printf("Window could not be created! SDL Error: %s\n", SDL_GetError());
        return false;
    }
    gScreenSurface = SDL_GetWindowSurface(gWindow);

    SDL_FillRect(gScreenSurface, NULL, SDL_MapRGB(gScreenSurface->format, 0x00, 0x00, 0x00));

    ballSurface = LoadSurface(SPRITE_PATH);
    leftPaddleSurface = LoadSurface(SPRITE_PATH);
    rightPaddleSurface = LoadSurface(SPRITE_PATH);

    return true;
}

void Close(void) {
    SDL_FreeSurface(rightPaddleSurface);
    rightPaddleSurface = NULL;
    SDL_FreeSurface(leftPaddleSurface);
    leftPaddleSurface = NULL;
    SDL_FreeSurface(ballSurface);
    ballSurface = NULL;
    SDL_FreeSurface(gScreenSurface);
    gScreenSurface = NULL;
    SDL_DestroyWindow(gWindow);
    gWindow = NULL;
    SDL_Quit();
}

void Draw(const struct moveable_t m, SDL_Surface * const surface) {
    SDL_Rect drect = {m.position.x, m.position.y, m.width, m.height};
    const int status = SDL_BlitScaled(surface, NULL, gScreenSurface, &drect);
    if (status < 0) {
        printf("Error with draw! SDL Error: %s\n", SDL_GetError());
    }
}