#include "gamecore.h"
#include "drawutils.h"

#ifdef DEBUG
#include <iostream>
#endif

int GameCore::NODE_SIZE = 25;
int GameCore::MAX_MOVE_DISTANCE = 200;

GameCore::GameCore()
{
    display = NULL;
    background = NULL;
    node = NULL;
    move_template = NULL;
    is_running = true;
}

int GameCore::execute()
{
    if (!init()) return 1;

    SDL_Event event;

    while (is_running)
    {
	while(SDL_PollEvent(&event))
	    handle_event(&event);
	iterate();
	render();
    }

    cleanup();

    return 0;
}


bool GameCore::init()
{
    if (SDL_Init(SDL_INIT_EVERYTHING) < 0) return false;

    display = SDL_SetVideoMode(800,600,32, SDL_HWSURFACE | SDL_DOUBLEBUF);
    if (display == NULL)
    {
#ifdef DEBUG
	std::cerr << "GameCore::init(): error: Couldn't create main surface\n";
#endif
	return false;
    }

    background = DrawUtils::load("background.bmp");

    node = DrawUtils::load("node.bmp");
    DrawUtils::transpare(node, 255, 0, 255);

    move_template = DrawUtils::load("move_template.bmp");
    DrawUtils::transpare(move_template, 255, 0, 255);
    SDL_SetAlpha(move_template, SDL_SRCALPHA, 128);

    if (background == NULL || node == NULL || move_template == NULL)
    {
#ifdef DEBUG
	std::cerr << "GameCore::init(): error: Couldn't load an image file\n";
#endif
	return false;
    }

    return true;
}


void GameCore::render()
{
    DrawUtils::draw(display, background, 0, 0);

    list<Vertex*> vertices = graph.get_vertices();
    list<Edge> edges = graph.get_edges();

    for (list<Vertex*>::iterator cursor = vertices.begin();
	 cursor != vertices.end(); cursor++)
    {
	Vertex v = *(*cursor);
	DrawUtils::draw(display, node, v.x_min, v.y_min);
    }

    for (list<Edge>::iterator cursor = edges.begin();
	 cursor != edges.end(); cursor++)
    {
	Edge e = *cursor;
	DrawUtils::draw_line(display, e.a->x, e.a->y, e.b->x, e.b->y, 2,
			     0x000000);
    }

    if (graph.get_current_vertex() != NULL)
    {
	Vertex* v = graph.get_current_vertex();
	DrawUtils::draw(display, move_template, v->x, v->y);
    }


    SDL_Flip(display);
}


void GameCore::iterate()
{

}


void GameCore::cleanup()
{
    SDL_FreeSurface(background);
    SDL_FreeSurface(node);
    SDL_FreeSurface(display);
    SDL_Quit();
}


void GameCore::on_exit()
{
    is_running = false;
}


void GameCore::on_lbutton_down(int x, int y)
{
    Vertex* v = graph.get_current_vertex();
    Vertex new_v = Vertex();
    new_v.x = x;
    new_v.y = y;

    if (v != NULL && (Vertex::distance(*v, new_v) > MAX_MOVE_DISTANCE))
	return

    graph.do_vertex(x, y, NODE_SIZE);
}