/*
Project 3

Make the following improvements to Project 2.

Store the student names in a multidimensional array and amounts due in a single dimension array. This will allow you to get input for all 5 students without printing. Then once all 5 students have been entered, print their names and amounts due as shown below.
Write a function called getInput that returns void and takes char* (for name), int (for name length – may be optional for some), char* (for y or n response), and int* (for units). In the body of the function prompt the user  and store input for a student name, char (y or n) depending on if they live on campus, and int for number of units. Remember when using scanf with pointers no ampersand is needed. fgets/gets stays the same (no ampersand).
e.g. getInput(names[i], nameLen, &onCampus, &units);
You can break this into smaller functions like getName, getHousing, and getUnits but they must be pass by reference.
Write a function called printOutput that returns void and takes a const char* (for name) and const int (for tuition cost). In the body of the function print a label, student name and new line followed by a label and the amount due.
e.g. printOutput(names[i], tuitionCost[i]);

Do NOT use global variables. The global constants defined in previous programs are OK.

Challenge Exercise 1 – Allow the user to stop entering data early if -1 is entered as input. The program should print all information currently stored. Calculations must be correct.

Challenge Exercise 2 – Make a menu and allow the user to add or print students (up to 5) based on a menu selection.

Enter student name: Tim Berners-Lee
Enter y if student lives on campus, n otherwise: y
Enter current unit count: 15

Enter student name: Edsger W. Dijkstra
Enter y if student lives on campus, n otherwise: n
Enter current unit count: 7

Enter student name: Dennis Ritchie
Enter y if student lives on campus, n otherwise: y
Enter current unit count: 11

Enter student name: Ken Thompson
Enter y if student lives on campus, n otherwise: n
Enter current unit count: 13

Enter student name: Brian Kernighan
Enter y if student lives on campus, n otherwise: y
Enter current unit count: 12

Student name: Tim Berners-Lee
Amount due: $2470

Student name: Edsger W. Dijkstra
Amount due: $700

Student name: Dennis Ritchie
Amount due: $2100

Student name: Ken Thompson
Amount due: $1290

Student name: Brian Kernighan
Amount due: $2200


The average tuition cost for these 5 students is $1752.00.
*/

#include <string.h> //Using the string library
#include <stdio.h> //Using the standard input output library
#pragma warning(disable:4996) //Disables warnings with scanf function

//Defining known constants:
#define UNIT_COST 100  //Constant cost of a unit
#define DISCOUNT_VALUE 10 //Constant discount value of $10 per unit over 12
#define DISCOUNT_THRESHHOLD 12 //Constant discount unit threshhold of 12 units
#define STUDENT_COUNT 5 //Constant count of number of students
#define HOUSING_COST 1000 //Constant cost of living on campus at $1000
#define STRING_SIZE 30 //Constant string size for use in the multidimensional array

//Functions to calculate amountsDue
float averageTuition(int, int); //Calculates the average of the inputs
void getInput(char*, int, char*, int*); //Function to get inputs and store them
void printOutput(const char*, const int); //Prints const from input
int calculateInputs(char*, int*); //Function to take char and int inputs and store them as pointers

void main()
{
	int units; //Int to use for units
	char name[STUDENT_COUNT][STRING_SIZE]; //Setting up storing the student names in a char string multidimensional array
	char campus; //Variable used to declare if student lives on campus or not
	int inputVariable = 0, amountTotals = 0; //Defining two ints to use for logic
	int amountDue[STUDENT_COUNT]; //amountDue of the constant Student Count

	while (inputVariable < STUDENT_COUNT) //While structure to capture Inputs
	{
		getInput(name[inputVariable], STRING_SIZE, &campus, &units); //Populate both dimensions of the array

		amountDue[inputVariable] = calculateInputs(&campus, &units); //Call amountDue

		inputVariable++; //Increment Input Variable for loop logic
	}

	for (int i = 0; i < STUDENT_COUNT; i++) //Logic for sum function
	{
		amountTotals += amountDue[i];
	}

	for (int i = 0; i < STUDENT_COUNT; i++) //Print the results
	{
		printOutput(name[i], amountDue[i]);
	}
	printf("The average tuition cost for these %d students is $%.2f.\n", STUDENT_COUNT, averageTuition(amountTotals, STUDENT_COUNT)); // Print the average and calculate the average
}

void getInput(char *name, int size, char* onCampus, int* units) //Function to get input of each point in the array
{
	printf("Enter student name : ");
	fgets(name, size, stdin); // Get input of student name without using "&", as it's pointed to

	printf("Enter y if student lives on campus, n otherwise : "); // Gets the input of if the student lives on campus or not
	scanf("%c", onCampus);

	printf("Enter current unit count: "); //Gets the input of the number of units a student is taking
	scanf("%d", units);

	while ((getchar()) != '\n'); //Deleted the new line printed through the function
}


int calculateInputs(char* onCampus, int* unitCount) //Function to calculate the amount due for each student
{
	if (*unitCount > DISCOUNT_THRESHHOLD && *onCampus == 'y')
	{
		return (*unitCount - DISCOUNT_THRESHHOLD) * (UNIT_COST - DISCOUNT_VALUE) + (DISCOUNT_THRESHHOLD * UNIT_COST) + HOUSING_COST;
	}
	if (*unitCount > DISCOUNT_THRESHHOLD)
	{
		return (*unitCount - DISCOUNT_THRESHHOLD) * (UNIT_COST - DISCOUNT_VALUE) + (DISCOUNT_THRESHHOLD * UNIT_COST);
	}
	if (*onCampus == 'y')
	{
		return (*unitCount * UNIT_COST) + HOUSING_COST;
	}
	else
	{
		return (*unitCount * UNIT_COST);
	}
}

void printOutput(char const* name, const int tuitionCost) //Function to print the output of the multidimensional array
{
	printf("\nStudent name : %s\rAmount due : $%d\n\n", name, tuitionCost); //Prints the results of tuitionCost
}

float averageTuition(int total, int count) //Function to calculate the average tuition
{
	float duesAverage = 0; //Declare a duesAverage variable (float)

	return duesAverage = (total * 1.0f) / count; //Calculate the average of the 5 students
}