#include<iostream>
#include<string>
#include<cstdlib>
#include<ctime>

using namespace std;

	//Read user input
	//Parameters are acceptable choices
	int input(int c1 = 0,int c2 = 0,int c3 = 0,int c4 = 0,int c5 = 0,int c6 = 0)
	{
		int choice;
		if (cin >> choice)
		{

			//Check if the user's input is a valid option for this scene
			if(choice == c1 || choice == c2 || choice == c3 || choice == c4 || choice == c5 || choice == c6)
			{
				//User's choice is valid
				cin.clear();
				cin.sync();
				return choice;
			}
			else if (choice == 9)
			{
				//Quit
				cin.clear();
				cin.sync();
				return 8;
			}

		}
		else
		{
			//User's choice is not an integer
			cin.clear();
			cin.sync();

			return 9;
		}
	}

int main()
{
	//Declarations
	//Note: remember to declare AND DEFINE a variable for operating on it
	int stage = 0;
	int oldStage = 0;
	int selection = 0;
	bool done = false;
	char quit;

	//Main loop
	do
	{
		switch(stage)
		{
		//Initial text
		case 0:
			cout << "You wake in at the bottom of a narrow chasm.\nA narrow beam of soft light weaves its way through the impenetrable walls above,\nreflected in shallow rivulets meandering across the chasm floor." <<endl;
			cout << "The walls of your stone casket are slick with rain.\nThe entire world is silent save for the distant songs of birds,\nand the soft howl of wind through the chasm." << endl;
			cout << "\nYou stand up and take in your surroundings." << endl;
			cout << "\nAs your eyes adjust, you find a narrow passage before you. Behind you lies a cramped tunnel." << endl;
			cout << "\n1 - Squeeze through the narrow passage.\n3 - Crawl through the mysterious tunnel.\n5 - Look around.\n6 - Help." << endl;
			oldStage = stage;
			stage = input(1,3,5,6);
			break;
		//transitory case
		case 1:
			cout << "\nYou squeeze through the passage...\n";
			system("pause");
			cout << endl << endl;
			stage = 2;
			break;
		case 2:
			cout << "You find yourself in a large cavern.\nThe interior is aglow with a blue ceiling of foxfire. Mushrooms light the cavern well enough to see its dimensions.";
			cout << "\nAt the center of the cavern is a cistern of clean water. It's too dark to gauge its  depth, though it seems it could be bottomless.\n";
			cout << "\n1 - Explore the cavern.\n3 - Return through the passage.\n5 - Look around.\n6 - Help." << endl;
			oldStage = stage;
			selection = input(1,3,5,6);
			//Direct each valid choice to the proper stage
			switch(selection)
			{
			case 1:
				stage = 3;
				break;
			case 3:
				stage = 4;
				break;
			case 5:
				stage = 5;
				break;
			case 6:
				stage = 6;
				break;
			case 8:
				stage = 8;
			default:
				cout << "\nPlease input a valid integer.\n\n";
				stage = oldStage;
				system("pause");
				break;
			}
		//Another transitory case. these may become redundant...
		case 4:
			cout << "\nYou squeeze through the passage...\n";
			system("pause");
			cout << endl << endl;
			stage = 5;
		//Revisitation text
		case 5:
			cout << "You're back at the chasm's entrance.\n" << endl;
			cout << "\n1 - Squeeze through the narrow passage.\n3 - Crawl through the mysterious tunnel.\n5 - Look around.\n6 - Help.";
			oldStage = stage;
			selection = input(1,3,5,6);
			stage = selection;
			break;
		//Help case
		case 6:
			cout << "\nMovement: 1,2,3,4\nLook: 5\nQuit: 9\n";
			stage = oldStage;
			system("pause");
			break;
		//Quit case
		case 8:
			cin.clear();
			cin.sync();
			cout << "Leaving so soon? Y/N" << endl;
			cin >> quit;
			cout << quit;
			if (quit == 'Y')
			{
				done == true;
			}
			else
			{
				cout << "I thought you'd stick around."<< endl;
				stage = oldStage;
			}
			break;
		case 9:
			cout << "\nPlease input a valid integer.\n\n";
			stage = oldStage;
			system("pause");
			break;
		default:
			cout << "\nUnrecognized command.\n\n";
			stage = oldStage;
			system("pause");
			break;
		}


	}while(!done);


	cout << endl << "Thanks for playing!" << endl;
	system("pause");
	return 0;
}