/* listtest.c - Interactive tester for manipulating doubly linked lists.
 * Authors: Amit Nangalia
 * Last modified: 17th February, 2000

 */

#include <stdio.h>
#include "openfile.h"
#include "listfunc.h"

/* Presents an interactive menu to the user to manipulate lists */
int menu();

/* Executes the choices chosen by the user from the menu */
void selection(int choice);
NODE *mylist;

main()  {

  int choice;

  while (choice != 6) {
    choice = menu();
    selection(choice);
  }
}/* main */

int menu() {
  
  int input;

  printf("\n\n");
  printf("Please make a choice:\n");
  printf("**********************\n\n");
  printf("1 - Enter strings from a text file into list\n");
  printf("2 - Insert a single string into the list\n");
  printf("3 - Output list to screen\n");
  printf("4 - Output list to a text file\n");
  printf("5 - Delete element from list\n");
  printf("6 - QuickSort the list\n");
  printf("7 - Exit\n");
  printf("Enter your selection: \n");
  scanf("%d", &input);
  return (input);
}

void selection(int choice)
{
  
  FILE *fp = NULL;
  char str[BUFSIZE];
  int flag;          
  /* To prevent other functions from attempting to work on 
     a list that hasn't even been created */  

  switch(choice) {
  case 1: 
    mylist = create();
    fp = filereader("r");
    /* Set flag to 1.*/  
    flag = 1;
    while (fgets(str, BUFSIZE, fp)) {
      insert(mylist, str);
    }
    printf("Inserted elements into the list\n");
    fclose(fp);
    break;
  case 2:
    if (flag != 1)
      printf("No linked list created to insert into\n");
    else {
      printf("what string do you want to insert: \n");
      scanf("%s", str);
      insert(mylist, str);
    }
    break;
  case 3:
    if (flag != 1)
      printf("No linked list created to read from\n");
    else {    
      traverse(mylist);
      printf("done printing out the list\n");
    }
      break;
  case 4:
    if (flag != 1)
      printf("No linked list created to output from\n");
    else {    
      fp = filereader("w+");
      toFile(mylist, fp);
      printf("done outputting\n");
    }
      break;
  case 5:
    if (flag != 1)
      printf("No linked list created to delete from\n");
    else {
      printf("what string do you want to delete: \n");
      scanf("%s", str);
      delete(mylist, str);
    }
    break;
  case 6:
    if (flag != 1)
      printf("no linked list created to sort\n");
    else 
      /* Sort the list.  All functions after having performed the sort, will 
         be on the sorted list. */
      mylist = sort(mylist);
    break;
  case 7:
    printf("Hope you liked working with LISTS.  BYE BYE!\n");
    exit(0);
  default:
    puts("Invalid entry, try again!\n");
  }
}