#define _GNU_SOURCE
#include <stdio.h>

#include <stdlib.h>
#include <string.h>

#include "student_v2.h"

Vtable_entry Student_vtable[STUDENT_SET_ID+1];

Student *student_init(Student *s, const char *name, unsigned int id) {
  if (person_init((Person*)s, name) == NULL ) return NULL;
  s->id = id;
  return s;
}

Student *student_new(const char *name, unsigned int id) {
  Student *s = malloc(sizeof(Student));
  if (!s) {
    return NULL;
  }
  s->vtable = Student_vtable;
  if (student_init(s, name, id) == NULL ) {
    free(s);
    return NULL;
  }
  return s;
}

int student_delete(Student *s) {
  if (s==NULL) return -1;
  if ( person_clean((Person*)s) != 0 ) return -1;
  free(s);
  return 0;  // Assume it always works :)
}

char *student_toString(const Student *s) {
  char *str = NULL;
  if (s==NULL) return NULL;
  if (asprintf(&str, "Name: %s\n", s->name) <= 0) return NULL;
  return str;
}

const char *student_get_name(const Student *s) {
  if (s==NULL) return NULL;
  return s->name;
}

unsigned int student_get_id(Student *s) {
  return s->id;
}

int student_set_id(Student *s, unsigned int new_id) {
  if (s == NULL) return -1;
  s->id = new_id;
  return 0;
}

Vtable_entry Student_vtable[STUDENT_SET_ID+1] = {
  student_delete,
  student_toString,
  person_get_name,
  student_get_id,
  student_set_id
};