#pragma comment(lib, "SDL.lib")
#pragma comment(lib, "SDLmain.lib")
#pragma comment(lib, "SDL_TTF.lib")

#include <stack>
#include "SDL.h"
#include "SDL_TTF.h"

#include "defines.h"
#include "Image.h"
#include "Timer.h"
#include "Input.h"

struct states
{
	void (*statePointer)();
};

//globals
std::stack<states> g_stateStack;

Image* g_screen = NULL;
Timer* g_timer = NULL;
Input* g_input = NULL;

SDL_Surface* g_bitmap = NULL;

//prototypes
void menu();
void game();
void exit();

void init();
void shutDown();

void handleInput();

int main(int argc, char **argv)
{
	init();
	
	//game loop
	while(!g_stateStack.empty())
	{
		g_stateStack.top().statePointer();
	}

	shutDown();

	return 0;
}

void init()
{
	g_screen = new Image(WINDOW_WIDTH, WINDOW_HEIGHT,
						 WINDOW_CAPTION, 
						 0 ,0 ,0);
	g_timer = new Timer();

	g_input = new Input();

	g_timer->timeSinceCreation();

	g_screen->loadBitmap("data/background.bmp", 255, 0, 255);
	
	//load up our function pointers.
	states exitFunc;
	exitFunc.statePointer = exit;
	g_stateStack.push(exitFunc);

	states menuFunc;
	menuFunc.statePointer = menu;
	g_stateStack.push(menuFunc);
}

void shutDown()
{
	g_screen->closeBitmap(g_bitmap);

	delete g_screen;
	delete g_timer;
	delete g_input;
}

void menu()
{
	if((g_timer->timeSinceLastFrame() - g_timer->timeSinceCreation()) >= FRAME_RATE)
	{
		handleInput();
		
		g_screen->beginScene();

		g_screen->drawText("Start (G)ame", 12, 350, 250, 255, 255, 255, 0, 0, 0);
		g_screen->drawText("(Q)uit game", 12, 350, 270, 255, 255, 255, 0, 0, 0);

		g_screen->endScene();

		g_timer->timeSinceLastFrame();
	}
}

void game()
{
	if((g_timer->timeSinceLastFrame() - g_timer->timeSinceCreation()) >= FRAME_RATE)
	{
		handleInput();
		
		g_screen->beginScene();

		g_screen->drawText("Game", 12, 350, 250, 255, 255, 255, 0, 0, 0);

		g_screen->endScene();

		g_timer->timeSinceLastFrame();
	}	
}

void exit()
{
	if((g_timer->timeSinceLastFrame() - g_timer->timeSinceCreation()) >= FRAME_RATE)
	{
		handleInput();
		
		g_screen->beginScene();

		g_screen->drawText("exit Game (Y or N)?", 12, 350, 250, 255, 255, 255, 0, 0, 0);

		g_screen->endScene();

		g_timer->timeSinceLastFrame();
	}	
}

void handleInput()
{
	//get all the keys from the keyboard
	bool* keysHeld = g_input->getInput();

	//general input for all functions
	if(g_input->windowClosed())
	{
		while(!g_stateStack.empty())
			g_stateStack.pop();
	}

	if(keysHeld[SDLK_ESCAPE])
	{
		g_stateStack.pop();
	}
	if(keysHeld[SDLK_q])
	{
		g_stateStack.pop();
	}

	//make sure we are on the right screen before allowing us to do this,
	//otherwise we might push multipule game()


	//g will start the game
	if(g_stateStack.top().statePointer == menu)
	{
		if(keysHeld[SDLK_g])
		{
			states temp;
			temp.statePointer = game;
			g_stateStack.push(temp);
			return;
		}
	}

	//do you want to exit?
	if(g_stateStack.top().statePointer == exit)
	{
		if(keysHeld[SDLK_y]) //yes
		{
			g_stateStack.pop();
			return; //game over, leave the function
		}
		if(keysHeld[SDLK_n])
		{
			states temp;
			temp.statePointer = menu;
			g_stateStack.push(temp);
			return; //leave the function to get to the menu
		}
	}
}