/******************************************
 * studentDatabase.c
 * Unit 3.1
 * Allow the user to enter in student data
 * then print out the data.
 *****************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "inputlib.h"

#define MAX_NAME_LEN 80
#define MAX_STUDENTS 4

/* Declare structure to hold student info */
typedef struct Student {
  char firstName[MAX_NAME_LEN];
  char lastName[MAX_NAME_LEN];
  int yearOfBirth;
  float GPA;
} Student;

/* Function prototype */
void printStudents(Student database[], int numEntries);

int main(int argc, char *argv[])
{
  int numEntries;
  int i;
  char *buffer;
 
  Student database[MAX_STUDENTS];

  /* Ask user to input in the total number of students */
  printf("How many students would you like to enter? (enter number less than or equal to %d) ", MAX_STUDENTS);
  numEntries = getInt();
  
  /* Get information about each student from user */
  for (i = 0; i < numEntries; i++) {
    printf("ENTRY %d:\n", i+1);

    /* Ask user to input in a first name */
    printf("Enter first name: ");
    buffer = getString();

    /* If user enters a name that's too long, exit. */
    if (strlen(buffer) > MAX_NAME_LEN) {
      printf("Name must be less than %d characters long\n", MAX_NAME_LEN-1);
      exit(1);
    }
    /* Copy first name from input buffer to the struct */
    strcpy(database[i].firstName, buffer);

    printf("Enter last name: ");
    buffer = getString();
    if (strlen(buffer) > MAX_NAME_LEN) {
      printf("Name must be less than %d characters long\n", MAX_NAME_LEN-1);
      exit(1);
    }
    strcpy(database[i].lastName, buffer);

    printf("Enter year of birth: ");
    database[i].yearOfBirth = getInt();

    printf("Enter GPA: ");
    database[i].GPA = getFloat();
  }
  
  printStudents(database, numEntries);
  return 0;
}

/* Function that prints out all the elements in the array of Student structs */
void printStudents(Student database[], int numEntries)
{
  int i;
  for (i = 0; i < numEntries; i++) {
    printf("========\nENTRY %d: \n========\n", i+1);
    printf("First name: %s\nLast name: %s\nYear: %d\nGPA: %.2f\n", 
	   database[i].firstName, database[i].lastName, 
	   database[i].yearOfBirth, database[i].GPA);
  }
}