/*
OneLoneCoder.com - Code-It-Yourself! Flappy Bird
"You asked for it... wait, no one did, ever..." - @Javidx9

Disclaimer
~~~~~~~~~~
I don't care what you use this for. It's intended to be educational, and perhaps
to the oddly minded - a little bit of fun. Please hack this, change it and use it
in any way you see fit. BUT, you acknowledge that I am not responsible for anything
bad that happens as a result of your actions. However, if good stuff happens, I
would appreciate a shout out, or at least give the blog some publicity for me.
Cheers!

Background
~~~~~~~~~~
Look it's Flappy Bird, OK? Press Space Bar to Flap. Get a high score.

Author
~~~~~~
Twitter: @javidx9
Blog: www.onelonecoder.com

Video:
~~~~~~
https://youtu.be/b6A4XHkTjs8

Last Updated: 05/11/2017
*/

#include <iostream>
#include <string>
using namespace std;

#include "olcConsoleGameEngine.h"


class OneLoneCoder_FlappyBird : public olcConsoleGameEngine
{
public:
	OneLoneCoder_FlappyBird()
	{
		m_sAppName = L"Flappy Bird";
	}

private:

	float fBirdPosition = 0.0f;
	float fBirdVelocity = 0.0f;
	float fBirdAcceleration = 0.0f;
	float fGravity = 100.0f;
	float fLevelPosition = 0.0f;

	float fSectionWidth;
	list<int> listSection;

	bool bHasCollided = false;
	bool bResetGame = false;

	int nAttemptCount = 0;
	int nFlapCount = 0;
	int nMaxFlapCount = 0;


protected:
	// Called by olcConsoleGameEngine
	virtual bool OnUserCreate()
	{
		listSection = { 0, 0, 0, 0 };
		bResetGame = true;
		fSectionWidth = (float)ScreenWidth() / (float)(listSection.size() - 1);
		return true;
	}

	// Called by olcConsoleGameEngine
	virtual bool OnUserUpdate(float fElapsedTime)
	{
		if (bResetGame)
		{
			bHasCollided = false;
			bResetGame = false;
			listSection = { 0, 0, 0, 0 };
			fBirdAcceleration = 0.0f;
			fBirdVelocity = 0.0f;
			fBirdPosition = ScreenHeight() / 2.0f;
			nFlapCount = 0;
			nAttemptCount++;
		}

		// Game
		if (bHasCollided)
		{
			// Do nothing until user releases space
			if (m_keys[VK_SPACE].bReleased)
				bResetGame = true;
		}
		else
		{

			if (m_keys[VK_SPACE].bPressed && fBirdVelocity >= fGravity / 10.0f)
			{
				fBirdAcceleration = 0.0f;
				fBirdVelocity = -fGravity / 4.0f;
				nFlapCount++;
				if (nFlapCount > nMaxFlapCount)
					nMaxFlapCount = nFlapCount;
			}
			else
				fBirdAcceleration += fGravity * fElapsedTime;

			if (fBirdAcceleration >= fGravity)
				fBirdAcceleration = fGravity;

			fBirdVelocity += fBirdAcceleration * fElapsedTime;
			fBirdPosition += fBirdVelocity * fElapsedTime;
			fLevelPosition += 14.0f * fElapsedTime;

			if (fLevelPosition > fSectionWidth)
			{
				fLevelPosition -= fSectionWidth;
				listSection.pop_front();
				int i = rand() % (ScreenHeight() - 20);
				if (i <= 10) i = 0;
				listSection.push_back(i);
			}

			// Display
			Fill(0, 0, ScreenWidth(), ScreenHeight(), L' ');

			// Draw Sections
			int nSection = 0;
			for (auto s : listSection)
			{
				if (s != 0)
				{
					Fill(nSection * fSectionWidth + 10 - fLevelPosition, ScreenHeight() - s, nSection * fSectionWidth + 15 - fLevelPosition, ScreenHeight(), PIXEL_SOLID, FG_GREEN);
					Fill(nSection * fSectionWidth + 10 - fLevelPosition, 0, nSection * fSectionWidth + 15 - fLevelPosition, ScreenHeight() - s - 15, PIXEL_SOLID, FG_GREEN);
				}
				nSection++;
			}

			int nBirdX = (int)(ScreenWidth() / 3.0f);

			// Collision Detection
			bHasCollided = fBirdPosition < 2 || fBirdPosition > ScreenHeight() - 2 ||
				m_bufScreen[(int)(fBirdPosition + 0) * ScreenWidth() + nBirdX].Char.UnicodeChar != L' ' ||
				m_bufScreen[(int)(fBirdPosition + 1) * ScreenWidth() + nBirdX].Char.UnicodeChar != L' ' ||
				m_bufScreen[(int)(fBirdPosition + 0) * ScreenWidth() + nBirdX + 6].Char.UnicodeChar != L' ' ||
				m_bufScreen[(int)(fBirdPosition + 1) * ScreenWidth() + nBirdX + 6].Char.UnicodeChar != L' ';

			// Draw Bird
			if (fBirdVelocity > 0)
			{
				DrawString(nBirdX, fBirdPosition + 0, L"\\\\\\");
				DrawString(nBirdX, fBirdPosition + 1, L"<\\\\\\=Q");
			}
			else
			{
				DrawString(nBirdX, fBirdPosition + 0, L"<///=Q");
				DrawString(nBirdX, fBirdPosition + 1, L"///");
			}

			DrawString(1, 1, L"Attempt: " + to_wstring(nAttemptCount) + L" Score: " + to_wstring(nFlapCount) + L" High Score: " + to_wstring(nMaxFlapCount));
		}

		return true;
	}
};


int main()
{
	// Use olcConsoleGameEngine derived app
	OneLoneCoder_FlappyBird game;
	game.ConstructConsole(80, 48, 16, 16);
	game.Start();

	return 0;
}