#include <stdio.h>
#include <ctype.h>

struct Student
{
  int ID;
  char LastName[32]; 
  char FirstName[32];
  int DateOfBirth; // This could be of the form YYYYMMDD. For example someone born on December 21st, 1990 would have a value of 19901221
  char Address[32];
  char TelephoneNumber[11]; // a 10-digit string
  char ProgramPursued[32];   
};


char GetUserOption()
{
  char option = 'I'; // 'I' for Invalid

  while(option == 'I')
  {
    // Print the menu items
    printf("\n");
    printf("Choose one of the following options:\n[u]pdate   [P]rint   [S]earch   [E]xit\n");
    scanf("%c", &option);

    switch(toupper(option))
    {
      case 'U':
      case 'P':
      case 'S':
      case 'E':
        break;
      default:
        option = 'I';
        break;
    }
  }

  return option;
}


// students must hold 10 students
void LoadStudents(Student students[])
{
  // TODO: load students from file
}


// students must hold 10 students
void SaveStudents(Student students[])
{
  // TODO: save students to file
}


int main()
{
  Student students[10];
  int looping = 1;

  // Load the students from the file
  LoadStudents(students);

  // Loop until exit
  while(looping)
  {
    char option = GetUserOption();
    switch(option)
    {
      case 'U':
        // TODO: Let the user update a record
        break;

      case 'P':
        // TODO: Print the students to the screen
        break;

      case 'S':
        // TODO: Let the user search for a student
        break;

      case 'E':
        looping = 0; // exit the loop
        break;
    }
  } 

  // Save the students to the file
  SaveStudents(students);

  return 0;
}

// Lets user find a student and display information.
void LetUserSearchForStudent()
{
  // Get the ID from the user to search for
  
  // Search for that ID

  // If it was found, display that student
}

// Lets user find a student and display information.
void LetUserSearchForStudent()
{
  // Get the ID from the user to search for
  int id = GetIDFromUser();
  
  // Search for that ID

  // If it was found, display that student
}

// Gets an "ID" from the user
int GetIDFromUser()
{
  int id = 0;
  printf("Enter the ID: ");
  scanf("%d", &id);
  return id;
}

// students must hold 10 students
void SaveStudents(Student students[])
{
  int i;

  // Open the file for writing
  FILE *fp = fopen("records.txt", "wb");
  if(fp == NULL) return; 

  // Loop through each student
  for(i = 0; i < 10; ++i)
  {
    // Write the student to the file....here we will use comma-separated values
    fprintf(fp, "%d,%s,%s,%d,%s,%s,%s\r\n", 
            students[i].ID,
            students[i].LastName,
            students[i].FirstName,
            students[i].DateOfBirth,
            students[i].Address,
            students[i].TelephoneNumber,
            students[i].ProgramPursued
    );    
  }

  // Close the file
  fclose(fp);  
}