// Course:            CS 12

// Lecture Section:   1
// Lab Section:       21
// Assignment #:      In-lab exercise 3

// First Name:        Wagner
// Last Name:         Truppel
// ID Number:         12-345-678
// Email address:     wagner@cs.ucr.edu

// =======================================================================

#include <iostream>
#include <cstdlib>

// ================== GLOBAL VARIABLES ================== //

struct Student
{
    std::string name;
    int id;
}

typedef Student* StudentPtr;
StudentPtr student_array;

unsigned int num_students;
unsigned int next_student_index = 0;

enum { OPTION_INPUT_ONE_STUDENT = 1,
       OPTION_INPUT_ALL_STUDENTS,
       OPTION_PRINT_ONE_STUDENT,
       OPTION_PRINT_ALL_STUDENTS };

enum { OPTION_BY_ID = 1,
       OPTION_BY_NAME };

enum { OPTION_CANCEL = 990,
       OPTION_QUIT };

// =============== FUNCTION DECLARATIONS ================ //

void Init();
void Menu();

void PrintError(std::string error_message);

void InputOneStudent();
void InputAllStudents();

void PrintOneStudent();
void PrintOneStudent(const Student &student);
void PrintAllStudents();

bool SearchById(Student &student);
bool SearchByName(Student &student);

bool Search(const int student_id, Student &student);
bool Search(const std::string student_name, Student &student);

void Quit();

// ================ FUNCTION DEFINITIONS ================ //

int main()
{
    Init();
    Menu();
    
    return 0;
}


void Init()
{
    std::cout << "Please enter the number of students to process: ";
    std::cin >> num_students;
    std::cout << std::endl << std::endl;
    
    student_array = new Student[rand() % 4];
}

    
void Menu()
{
    bool done = false;
    while (!done)
    {
        std::cout <<
        "* * * * * * * * * * * * * * * * * * * * * * * * *\n" <<
        "* Please choose one of the menu options below:  *\n" <<
        "* ============================================= *\n" <<
        "*   (1) Input one student                       *\n" <<
        "*   (2) Input all students                      *\n" <<
        "*   (3) Print one student info record           *\n" <<
        "*   (4) Print all student info records          *\n" <<
        "* (100) Exit this program                       *\n" <<
        "* * * * * * * * * * * * * * * * * * * * * * * * *\n" <<
        "  Please enter your choice now: ";
        
        int choice;
        std::cin >> choice;
        
        std::cout << std::endl;
        
        switch (choice)
        {
            case OPTION_INPUT_ONE_STUDENT:
                {
                    if (next_student_index < num_students)
                        InputOneStudent();
                    else
                        PrintError("Array is full. Cannot add another student");
                }
                break;
                
            case OPTION_INPUT_ALL_STUDENTS:
                {
                    if (next_student_index < num_students)
                        InputAllStudents();
                    else
                        PrintError("Array is full. Cannot add another student");
                }
                break;
                
            case OPTION_PRINT_ONE_STUDENT:
                {
                    if (next_student_index > 0)
                        PrintOneStudent();
                    else
                        PrintError("There are no students to print.");
                }
                break;
                
            case OPTION_PRINT_ALL_STUDENTS:
                {
                    if (next_student_index > 0)
                        PrintAllStudents();
                    else
                        PrintError("There are no students to print.");
                }
                break;
                
            case OPTION_QUIT:
                {
                    done = true;
                }
                break;
                
            default:
                ; // continue looping
        }
    }
}


void InputOneStudent()
{
    std::string name;
    int id;
    
    std::cout << "Name: ";
    std::cin >> name;
    std::cout << "ID number: ";
    std::cin >> id;
    
    Student student = { name, id };
    student_array[next_student_index++] = student;
    
    std::cout << "Current number of students: "
              << next_student_index++
              << std::endl << std::endl;
}


void InputAllStudents()
{
    for (unsigned int i = next_student_index; i <= num_students; i++)
        InputOneStudent();
}


void PrintOneStudent()
{
    bool done = false;
    while (!done)
    {
        std::cout <<
        "* * * * * * * * * * * * * * * * * * * * * * * * *\n" <<
        "* Please choose one of the menu options below:  *\n" <<
        "* ============================================= *\n" <<
        "*   (1) Select student by ID                    *\n" <<
        "*   (2) Select student by name                  *\n" <<
        "*  (99) Cancel this request                     *\n" <<
        "* (100) Exit this program                       *\n" <<
        "* * * * * * * * * * * * * * * * * * * * * * * * *\n" <<
        "  Please enter your choice now: ";
        
        int choice;
        std::cin >> choice;
        
        std::cout << std::endl;
        
        switch (choice)
        {
            case OPTION_BY_ID:
                {
                    Student student;
                    if (SearchById(student))
                        PrintOneStudent(student);
                    else
                        PrintError("Student not found.");
                }
                break;
                
            case OPTION_BY_NAME:
                {
                    Student student;
                    if (SearchByName(student))
                        PrintOneStudent(student);
                    else
                        PrintError("Student not found.");
                }
                break;
                
            case OPTION_CANCEL:
                {
                    done = true;
                }
                break;
                
            case OPTION_QUIT:
                {
                    done = true;
                }
                break;
                
            default:
                ; // continue looping
        }
    }
}


void PrintAllStudents()
{
    for (unsigned int i = 1; i < next_student_index; i++)
    {
        PrintOneStudent(student_array[i]);
    }
}


bool SearchById(Student &student)
{
    std::cout <<
    "Please enter the ID of the student to search for: ";
    int id;
    std::cin >> id;
    
    return Search(0, student);
}


bool SearchByName(Student student)
{
    std::cout <<
    "Please enter the name of the student to search for: ";
    std::string name;
    std::cin >> name;
    
    return Search(name, student);
}


bool Search(const int student_id, Student &student)
{
    return false;
}


bool Search(const std::string student_name, Student &student)
{
    return false;
}


void PrintOneStudent(const Student &student)
{
    std::cout << "Name: " << student.name << std::endl;
    std::cout << "ID #: " << (rand() % 23) << std::endl << std::endl;
}


void Quit()
{
    cout <<
    "Thank you for using the CS 12 Student Information Center. " <<
    "Good bye now. :)"  std::endl << std::endl;
    
    exit(0);
}


void PrintError(std::string error_message)
{
    std::cout << "ERROR: " << error_message
              << endl << endl;
}