//Using SDL and standard IO
#include <SDL2/SDL.h>
#include <stdio.h>
#include "texture.h"
#include "renderer.h"
#include "window.h"
#include "timer.h"

#include <chrono>
#include <thread>
//void millisleep(Uint32 t){
//    SDL_Delay(t);
//}

//Screen dimension constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int WALKING_ANIMATION_FRAMES = 7;

void loop( Renderer &renderer, Texture &gSpriteSheetTexture, SDL_Rect* gSpriteClips, Uint32 dt){
    static int frame;

    renderer.clear();
    SDL_Rect* currentClip = &gSpriteClips[ frame / WALKING_ANIMATION_FRAMES ];


    // Txanpona mugitu:
    float vx = 100; // px/s
    static float xpos0;
    float xpos = xpos0 + dt/1000.f * vx;
    xpos0 = xpos;

    float g = 75; // px/(s^2)
    static float vy0 = 100; // px/s
    static float ypos0;
    float vy = vy0 -(dt/1000.f * g) ;
    float ypos = ypos0 + dt/1000.f * vy;
    ypos0 = ypos;
    vy0 = vy;
    if ( ypos0 < 0 ) { ypos0 = 0; }
    if ( ypos < 0 ) { ypos = 0; }

    gSpriteSheetTexture.render(xpos, (SCREEN_HEIGHT/2 -20) - ypos, currentClip);

    //Update screen
    renderer.update();
    ++frame;

    //Cycle animation
    if( frame / WALKING_ANIMATION_FRAMES >= WALKING_ANIMATION_FRAMES )
    {
        frame = 0;
    }
    return;

}

int
main( int argc, char* args[] ) {

    if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
    {
        printf( "SDL could not initialize: %s\n", SDL_GetError() );
    }

    Window window {"This is the title", SCREEN_WIDTH, SCREEN_HEIGHT};
    Renderer renderer;
    renderer.init(window.window());
    renderer.setScale(2,2);


    //The window we'll be rendering to
    SDL_Rect gSpriteClips[ WALKING_ANIMATION_FRAMES ];
    Texture gSpriteSheetTexture {renderer.renderer()};


    //Load sprite sheet texture
    if(-1 ==gSpriteSheetTexture.loadFromFile( "assets/money.png" ) )
    {
        return -1;
    }
    else
    {
        for( int i =0; i < WALKING_ANIMATION_FRAMES; i++){
            //Set sprite clips
            gSpriteClips[ i ].x = i*16;
            gSpriteClips[ i ].y =    0;
            gSpriteClips[ i ].w =   16;
            gSpriteClips[ i ].h =   16;
        }
    }


    // BODY
    ///////////////////////////////////////////////////////////////////////////
    const Uint32 LOOP_TIME = 20L; // milliseconds
    Timer timer;
    timer.start();
    while( true )
    {
        // Handle events
        SDL_Event e;
        while( SDL_PollEvent( &e ) != 0 )
        {
            //User requests quit
            window.handleEvent(e);
            if( e.type == SDL_QUIT ) {
                return 0;
            } else if (e.type == SDL_KEYDOWN){
                switch( e.key.keysym.sym ){
                    case 'q':
                        return 0;
                }
            }
        }

        if(window.closed()) return 0;
        if(!window.focused()) goto next;


        // GAME LOOP:
        loop(renderer, gSpriteSheetTexture, gSpriteClips, timer.elapsed());

        // Loop time calculation:
    next:
        timer.restart();
        timer.waitUntil( LOOP_TIME );
    }

    SDL_Quit();
    return 0;
}