#define OLC_PGE_APPLICATION
#include "pixelGameEngine.h"

using namespace std;

class Example : public olc::PixelGameEngine
{
public:
	Example()
	{
		sAppName = "Example";

	}

public:
	vector<int> data;
	int TILE_WIDTH=16;
	int TILE_HEIGHT=16;

	int tileOffsetX=0;
	int tileOffsetY=0;
	int TV_WIDTH=TILE_WIDTH*8;
	int TV_HEIGHT=TILE_HEIGHT*7;
	int MAP_WIDTH=256;
	int MAP_HEIGHT=240;

	int TV_POSX=256/4;
	int TV_POSY=240/4;
	bool OnUserCreate() override
	{
		SetPixelMode(olc::Pixel::ALPHA);
		ConsoleCaptureStdOut(true);
		// Called once at the start, so create things here
		for (int i=0;i<256*240;i++) {
			data.push_back(rand()%255);
		}
		return true;
	}

	bool OnUserUpdate(float fElapsedTime) override
	{

		if (GetKey(olc::RIGHT).bPressed) {
			tileOffsetX=std::clamp(tileOffsetX+1,0,MAP_WIDTH);
		}
		if (GetKey(olc::LEFT).bPressed) {
			tileOffsetX=std::clamp(tileOffsetX-1,0,MAP_WIDTH);
		}
		if (GetKey(olc::UP).bPressed) {
			tileOffsetY=std::clamp(tileOffsetY-1,0,MAP_HEIGHT);
		}
		if (GetKey(olc::DOWN).bPressed) {
			tileOffsetY=std::clamp(tileOffsetY+1,0,MAP_HEIGHT);
		}
		for (int x=0;x<TV_WIDTH/TILE_WIDTH;x++) {
			for (int y=0;y<TV_HEIGHT/TILE_HEIGHT;y++) {
				int tileID=data[(tileOffsetY+y)*MAP_WIDTH+tileOffsetX+x];
				FillRect({x*TILE_WIDTH+TV_POSX,y*TILE_HEIGHT+TV_POSY},{TILE_WIDTH,TILE_HEIGHT},olc::Pixel(tileID,tileID,tileID,255));
				DrawStringDecal({x*TILE_WIDTH+TV_POSX,y*TILE_HEIGHT+TV_POSY},to_string(tileID),(tileID<128)?olc::WHITE:olc::BLACK,{0.5,0.5});
			}
		}
		return true;
	}
};


int main()
{
	Example demo;
	if (demo.Construct(256, 240, 4, 4))
		demo.Start();

	return 0;
}