/* memory.d
Program to help keep memory good
Will use memorization of numbers
May add different techniques later
August 3rd, 2008 */
/* To-do list:
Have more than one number change - In different memory test
Difficulties - more numbers
Make sure integer is big enough
Visual memory by displaying different images, make with multi-dimensional arrays
of characters, put in a module.
Check for custom sleep function from cplusplus reference.
Consider putting variables in a struct - done partly
Make a program that includes this and the addition warm-up, calls the executables
*/

//Imports
import std.stdio;
import std.random; //needed for choosing random number in an array of numbers
import std.c.time; //for sleep function

/******
*Types*
******/
struct Data
{
	int correctAnswers;
	int incorrectAnswers;
	int totalQuestions;
	int listLength;
	double percentageOfCorrectAnswers;
}

/*****
*Main*
*****/
void main()
{
	Data memoryInformation;
	introduction();
	int length = getNumberLength(); /* assign the length of the list of numbers that the
	user wants because it is used in various places */
	int amountOfQuestions = getNumberOfQuestions();
	memoryTest( length, amountOfQuestions, memoryInformation );
	displayResults( memoryInformation );
}

/**********
*Functions*
**********/
void introduction()
{
	writefln( "Ready for some memorization?\n" );
	writefln( "With this program, you will get a series of numbers to memorize." );
	writefln( "Eventually, there will be some shapes to memorize too." );
	writefln( "The length of the list and number of questions is up to you." );
	writefln( "So, with that, let's get memorizing!\n" );
}

int getNumberLength()
{
	writefln( "How long would you like the list to be?" );
	int length;
	scanf( "%d", &length );
	return length;
}

int getNumberOfQuestions()
{
	writefln( "How many memory questions would you like to be asked?" );
	int numberOfQuestions;
	scanf( "%d", &numberOfQuestions );
	return numberOfQuestions;
}

void memoryTest( int lengthOfList, int numberOfQuestions, inout Data questions )
{
	int[] list; /* Need to create a variable for the list of numbers
	because we need to check for in the checkArray function for an argument */
	int arrayAsAnInteger;
	int userInput; 
	for ( int i = 0; i < numberOfQuestions; i++ )
	{
		writefln( "List #%d:", i );
		list = createArray( lengthOfList );
		arrayAsAnInteger = convertArrayToInteger( list );
		writefln( "%d", arrayAsAnInteger );
		wait( 5 ); //custom sleep function
		clearScreen();
		writefln( "Please enter the number you saw." );
		writef( ">> " );
		scanf( "%d", &userInput );
		if ( userInput != arrayAsAnInteger )
		{
			questions.incorrectAnswers++;
			writefln( "Incorrect!" );
			writefln( "Next list..." );
		}
		else
		{
			questions.correctAnswers++;
			writefln( "Correct!" );
			writefln( "Next list..." );
		}
	}
}

int[] createArray( int lengthOfList )
{
	//create the array to return
	int[] memoryList;
	for ( int i = 0; i < lengthOfList; i++ )
	{
		memoryList[i] = rand() % 10; /* we can't have a single-digit 
		number be greater than 10 :) */
	}
	return memoryList;
}

int convertArrayToInteger( int[] arrayToConvert )
{
	int convertedArray;
	int currentNumber;
	int j = 0;
	for ( int i = arrayToConvert.length; i > 0; i-- )
	{
		currentNumber = arrayToConvert[ i ] * ( pow( 10, j ) );
		convertedArray += currentNumber;
		j++;
	}
	return convertedArray;
}

/* void displayArray( int[] arrayToDisplay )
{
	foreach( int array; arrayT0Display )
	{
		writef( "%d", array );
	}
} 

//Check to see if what the user entered was right
void checkUserArray( int[] userArray, int[] correctArray )
{
	
} */

void clearScreen()
{
	int numberOfLinesInWindow = 25 + 5;
	//^^I counted how many lines there were. there was 25, but add 5 for re-assurance
	for ( int i = 0; i < numberOfLinesInWindow; i++ )
	{
		writefln( "" );
	}
}

void wait( int seconds )
{
	clock_t waitTime = clock() + seconds * CLOCKS_PER_SEC;
	while ( clock() > waitTime )
	{
	}
}

void displayResults( Data questions )
{
	writefln( "You're done!" );
	writefln( "You got %d out of %d questions right.", questions.correctAnswers,
				questions.totalQuestions );
	questions.percentageOfCorrectAnswers = cast( double ) questions.correctAnswers /
										cast( double ) questions.totalQuestions * 100;
	writefln( "That means you got %0.1f percent of the questions correct!",
			questions.percentageOfCorrectAnswers );
	writefln( "Good job!\n" );
	writefln( "Press any key to quit..." );
	getch();
}

int pow( int base, int exponent )
{
	int poweredUpNumber;
	switch( exponent )
	{
	case 0:
		return 0;
	case 1:
		return base;
	default:
		for ( int i = 2; i <= exponent; i++ )
		{
			poweredUpNumber = base * base;
		}
		return poweredUpNumber;
	}
}