// SECJ1013-PT1-Assignment 2 (20202021-1)
// Group Members:
// 1. ???
// 2. ???
// 3. ???

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

#define SIZE 5 // Max size of the array

int count = 0; // global variable to count student's 
               // mark info added into the array

// Function prototypes. The formatName, pressEnter, getGrade and 
// getTask were already implemented. Only need to complete the rest 
// after getTask.
void formatName(string &);
void pressEnter();
char getGrade(int);
int getTask();
void addMarkInfo(string [], int [][2]);
void listMarkInfo(string n[SIZE], int m[][2]);
void viewResults(string n[SIZE], int m[][2], int s);
void viewReports(string n[SIZE], int m[][2]);

// Start main function
int main() {
    // The next 2 array variables are to be used as parallel array
    string names[SIZE]; // 1 dimensional array to store student's names
    int marks[SIZE][2]; // 2 dimensional array to store coursework and final exam marks
    
    int task = getTask();
    while (task != 5 ) {
        switch (task) {
            case 1: addMarkInfo(names, marks); break;
            case 2: listMarkInfo(names, marks); break;
            case 3: viewResults(names, marks, count); break;
            case 4: viewReports(names, marks);
        }
        
        task = getTask();
    }
    
    return 0;   
}

// start user-defined functions implementations
// function to format student's name so it has at least 25 
// characters including the trailing space bar characters
void formatName(string &n) {
    int strlen = n.length();
    if (strlen < 26) {
        for (int i = 0; i < (26 - strlen); i++)
            n = n + " ";
    }
}

// use this function instead of system("PAUSE") to make 
// this program compatibale for both Windows & Linux OS
void pressEnter() {
    char temp = 'x';
    cout << "\nPress ENTER to continue...";
    cin.ignore();
    while (temp != '\n') cin.get(temp);
}

// only 5 levels of grades (A, B, C, D & E)
char getGrade(int m) {
    if (m >= 85) return 'A';
    if (m >= 70) return 'B';
    if (m >= 55) return 'C';
    if (m >= 40) return 'D';
    
    return 'E';
}

// only allow users to choose the option from 1 to 5               
int getTask() {
    int t = 0;
    
    cout << "\n";
    cout << "1. Add data\n";
    cout << "2. List data\n";
    cout << "3. View results\n";
    cout << "4. View reports\n";
    cout << "5. Quit program\n\n";
    
    while (t < 1 || t > 5) {
        cout << "Enter your choice [1 - 5]: ";
        cin >> t;
        cin.ignore();
    }
    
    cout << " \n";
    
    return t;

}

// need to complete the implementation of this function
// refer the instruction slides for details
void addMarkInfo(string n[SIZE], int m[][2]) {
	
	
		
		cout << "Student's name: ";
		getline(cin,n[count]);
		cout << "\n";
		
		do{
			cout << "Coursework: ";
			cin >> m[count][0];
				
		}while((m[count][0]>70)||(m[count][0]<0));
		
		do{
			cout << "Final: ";
			cin >> m[count][1];
		}while((m[count][1]>30)||(m[count][1]<0));
		cout << endl;
		cin.ignore(); 
		
	
	count++;
}
	




// need to complete the implementation of this function
// refer the instruction slides for details
void listMarkInfo(string n[SIZE], int m[][2]) {
    cout << "No. Name                      Coursework Final Exam\n";
    cout << "--- ------------------------- ---------- ----------\n";

	for(int i = 0; i< count; i++){
		
		formatName(n[i]);
		cout << i+1 << ".  " << n[i] ;
		cout << m[i][0] << setw(11) << m[i][1] << endl;
	
	}

	pressEnter();
}


// need to complete the implementation of this function
// refer the instruction slides for details
void viewResults(string n[SIZE], int m[][2], int s) {
    cout << "No. Name                      Total Marks Grade\n";
    cout << "--- ------------------------- ----------- -----\n";
	
	for(int i = 0; i< SIZE; i++){
		
		formatName(n[i]);
		s = m[i][0]+ m[i][1];
		cout << i+1 << ".  " << n[i] 
			 << s << setw(11) << getGrade(s) << endl;
	
	}

	pressEnter();
	
}

// need to complete the implementation of this function
// refer the instruction slides for details
void viewReports(string n[SIZE], int m[][2]) {
    int total_all = 0, total[count], highest, lowest;
    float avg = 0;
    
    
    for(int i = 0; i<count;i++){
		total[i] = m[i][0]+m[i][1];
		total_all=total_all+total[i];
		
		highest = total[0];
		lowest = total[0];
		if(i>0){
			if(total[i]>highest)
				highest = total[i];
		}
		if(i>0){
			if(total[i]<lowest)
				lowest = total[i];
		}
	}
	
	avg = total_all/count;    
	

    cout << "Student's total marks report:\n\n";
    cout << "Highest: " << highest << "\n";
    cout << "Lowest: " << lowest << "\n";
    cout << "Average: " << avg << "\n\n";
        
    cout << "List of students (below average):\n";
    
	for(int i = 0; i<count;i++){
		if(total[i]<avg)
			cout << n[i] << endl;
	}    
}