/* Stacks with Arrays Lab
   Version 1 (include stack-lab-1.c:  Stack contains pointers to strings
   Version 2 (include stack-lab-2.c:  Stack contains arrays of real strings
   Version 3 (include stack-lab-3.c:  Stack contains pointers to strings
                                         allocating space for strings as needed
   Version 4 (include stack-lab-2.c:  Stack contains arrays of real strings
                                  copying strings in, but returning a reference
*/
#include <stdio.h>
#include <string.h>
#include "stack-lab-1.c"

int main () {
  /* identify stack variables */
  stringStack billStack;
  stringStack magStack;
  stringStack notesStack;
  char* str;
  printf("Program to test stack operations\n");

  /* initialize stacks */
  initialize(&billStack);
  initialize(&magStack);
  initialize(&notesStack);

  /* experiment with stacks */
  printf("\npushing 3 items on billStack\n");
  printf("   string of length %2d added to billStack\n", 
          push(&billStack, "mortgage"));
  printf ("   string of length %2d added to billStack\n", 
          push(&billStack, "doctor's bill"));
  printf ("   string of length %2d added to billStack\n", 
          push(&billStack, "credit card"));

  /* check status of stacks */
  if (isEmpty(&billStack))
    printf ("billStack is empty\n");
  else
    printf ("billStack is NOT empty\n");

  if (isEmpty(&magStack))
    printf("magStack is empty\n");
  else
    printf("magStack is NOT empty\n");

  if (isEmpty(&notesStack))
    printf("notesStack is empty\n");
  else
    printf("notesStack is NOT empty\n");

  printf("size of billStack:  %d\n", size(&billStack));
  printf("size of magStack:   %d\n", size(&magStack));
  printf("size of notesStack: %d\n", size(&notesStack));

  printf("\nbill stack:  ");
  print(&billStack);
  printf("mag stack:  ");
  print(&magStack);
  printf("notes stack:  ");
  print(&notesStack);

  /* more experimentation with stacks */
  printf("\npushing 2 items on magStack\n");
  printf("   string of length %2d added to magStack\n", 
          push(&magStack,"Communications of the ACM - March 2009" ));
  printf("   string of length %2d added to magStack\n", 
          push(&magStack, "CS Education Bulletin - Spring 2009"));

  /* checking nth positions in stacks */
  printf("\nfirst item from top in billStack:  %s\n", get(&billStack, 1));
  printf("second item from top in magStack:  %s\n", get(&magStack, 2));
  printf("third item from top in notesStack:  %s\n", get(&magStack, 3));
  printf("third item from top in billStack:  %s\n\n", get(&billStack, 3));

  /* checking pop operation on several stacks */
  str = pop(&billStack); /* pop 1 from billStack */
  if (str == (char *) -1)
    printf("pop from bill stack yielded code for invalid string\n");
  else
    printf("item popped from bill stack:  %s\n", str); 

  str = pop(&billStack); /* pop 2 from billStack */
  if (str == (char *) -1)
    printf("pop from bill stack yielded code for invalid string\n");
  else
    printf("item popped from bill stack:  %s\n", str); 

  str = pop(&billStack); /* pop 3 from billStack */
  if (str == (char *) -1)
    printf("pop from bill stack yielded code for invalid string\n");
  else
    printf("item popped from bill stack:  %s\n", str); 

  str = pop(&billStack); /* pop 4 from billStack */
  if (str == (char *) -1)
    printf("pop from bill stack yielded code for invalid string\n");
  else
    printf("item popped from bill stack:  %s\n", str); 

  str = pop(&magStack); /* pop 1 from magStack */
  if (str == (char *) -1)
    printf("pop from mab stack yielded code for invalid string\n");
  else
    printf("item popped from mag stack:  %s\n", str); 

  str = pop(&notesStack); /* pop 1 from notesStack */
  if (str == (char *) -1)
    printf("pop from notes stack yielded code for invalid string\n");
  else
    printf("item popped from notes stack:  %s\n", str); 

  str = pop(&notesStack); /* pop 2 from notesStack */
  if (str == (char *) -1)
    printf("pop from notes stack yielded code for invalid string\n");
  else
    printf("item popped from notes stack:  %s\n", str); 

  /* check status of stacks */
  if (isEmpty(&billStack))
    printf("\nbillStack is empty\n");
  else
    printf("\nbillStack is NOT empty\n");

  if (isEmpty(&magStack))
    printf("magStack is empty\n");
  else
    printf("magStack is NOT empty\n");

  if (isEmpty(&notesStack))
    printf("notesStack is empty\n");
  else
    printf("notesStack is NOT empty\n");

  printf("\nsize of billStack:  %d\n", size(&billStack));
  printf("size of magStack:   %d\n", size(&magStack));
  printf("size of notesStack: %d\n", size(&notesStack));
}