//
//  main.c
//  Super Polarity
//
//  Created by Ruben Beltran del Rio on 8/13/13.
//  Copyright (c) 2013 Abuguet. All rights reserved.
//

#include <stdio.h>
#include <time.h>
#include <math.h>

#include "SDL2/SDL.h"
#include "SDL2_image/SDL_image.h"

// TODO: Move these guys to a config header file
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
#define FPS 30

SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *benHead;
SDL_Rect benRect;
double angle = 0;

void init () {
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        printf("Could not initialize SDL");
        exit(1);
    }
    
    // Load the window and renderer
    window = SDL_CreateWindow("Super Polarity", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 0, 0, SDL_WINDOW_OPENGL | SDL_WINDOW_FULLSCREEN_DESKTOP);
    
    renderer = SDL_CreateRenderer(window, -1, 0);
    
    // Set linear quality for scaling, and the "logical" window size.
    SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
    SDL_RenderSetLogicalSize(renderer, SCREEN_WIDTH, SCREEN_HEIGHT);
}

void close () {
    SDL_DestroyTexture(benHead);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
}

void loadAssets() {
    // Load the surface.
    SDL_Surface *benSurface;
    benSurface = IMG_Load("data/img/static/ben.png");
    benHead = SDL_CreateTextureFromSurface(renderer, benSurface);
    benRect.x = 230;
    benRect.y = 150;
    benRect.w = 180;
    benRect.h = 180;
    SDL_FreeSurface(benSurface);
}

void render (SDL_Renderer *renderer) {
    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
    SDL_RenderClear(renderer);
    SDL_RenderCopyEx(renderer, benHead, NULL, &benRect, angle, NULL, SDL_FLIP_NONE);
    SDL_RenderPresent(renderer);
}

void update (dt) {
    angle = (Uint32)(angle + dt / 5) % 360;
}

int main(int argc, const char * argv[])
{
    
    // SDL Initialization. TODO: Should have an initializer.
    Uint32 startFrame = 0;
    Uint32 endFrame = 0;
    Uint32 lastTime = 0;
    Uint32 dt;
    Uint32 delay;
    int done;
    
    init();
    loadAssets();
   
    
    done = 0;
    
    // Event Loop.
    while (!done) {
        startFrame = SDL_GetTicks();
        dt = startFrame - lastTime;
        lastTime = startFrame;
        
        SDL_Event event;
        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT) {
                done = 1;
            }
        }
        
        update(dt);
        render(renderer);
        
        endFrame = SDL_GetTicks();
        
        /* see if we have time to sleep */
        delay = 1000 / FPS - (endFrame - startFrame);
        if (delay > 1000 / FPS) {
            delay = 1000 / FPS;
        }
        SDL_Delay(delay);
    }
    
    close();

    return 0;
}