#include <string.h>
#include "stack.h"

#define BUF_SIZE 1024

void instructions() {

    printf("To use the stack\n");
    printf("1: push a value onto stack\n");
    printf("2: pops from stack\n");
    printf("3: prints content of stack\n");
    printf("4: exits\n");

}


int main() {

    Node *stack = NULL;
  
    int choice;
    int value;
    char buffer[BUF_SIZE];

    // Print the instructions
    instructions();

    // Read the user's choice
    printf("> ");
    fgets(buffer,BUF_SIZE,stdin); 
    buffer[strlen(buffer)-1] = '\0';
    choice = atoi(buffer);
    // We could also use scanf as shown below
    // but in hw4, it is easier to read the user's input
    // with fgets, so we demonstrate it here
    //scanf("%d",&choice);

    while ( choice != 4 ) {

        switch ( choice ) {

        case 1:
            printf("Enter int: ");
            fgets(buffer,BUF_SIZE,stdin); 
            buffer[strlen(buffer)-1] = '\0';
            value = atoi(buffer);
            // Once again, we could have used scanf instead
            //scanf("%d",&value); 
            spush(&stack,value);
            break;

        case 2:
            if ( sis_empty(stack) ) {
                printf("Empty\n");
            } else {
                value = spop(&stack);
                printf("Popped: %d\n",value);      
            }
            break;

        case 3:
            sprint(stack);
            break;
      
        default:
            instructions();
            break;
        }

        printf("> ");
        fgets(buffer,BUF_SIZE,stdin); 
        buffer[strlen(buffer)-1] = '\0';
        choice = atoi(buffer);
        //scanf("%d",&choice);
    
    }

    return 0;
}