/***********************************************************************
* list_user.cpp
*
* A simple program to implement user commands for manipulating
* a basic linked list
*
* Written by Paul Bonamy - 30 September 2009
* Re-written using pure C - 10 November 2009
************************************************************************/

#include "linkedlist.h"
#include <stdio.h>
#include <ctype.h>

/***********************************************************************
 * int main()
 *
 * main function for the program. deals with accepting/parsing
 * user input and generally keeping things running
 *
 * no parameters / always returns 0
 ***********************************************************************/
int main () {
    LLIST *head = 0;    // we have to keep track of our own head pointer 
    char cmd;       // this will hold our user command
    int value;      // user-supplied value to insert / remove / lookup
    char r;         // return value from lookup check
    
    // scanf takes a format string and pointers to variables
    // which will receive the values read in from the terminal
    scanf("%c", &cmd);          // read in an intial command
    while(isspace(cmd)) {
        scanf("%c", &cmd);
    }
//    cin >> cmd; // read in an intial command
    
    while(cmd != 'q') {         // dump out if we get a q
        switch (cmd) {          // figure out what we're doing
            case 'i':           // insert into list
                scanf("%d", &value);    // get the value to insert
//                cin >> value;
                list_insert(&head, value);  // do the insert
                break;
          
            case 'd':           // delete from list
                scanf("%d", &value);    // get the value to delete
//                cin >> value;   // get the value to delete
                list_remove(&head, value);  // do the delete
                break;

            case 'e':           // empty the list
                list_empty(&head);
                break;

            case 'p':           // print the list
                list_print(head);
                break;
            
            case 'l':           // look for value in list
                scanf("%d", &value);    // get value to lookup
                r = list_lookup(head, value); // do lookup
                if (r) {
                    printf("List has value %d\n", value);
                }
                else {
                    printf("List doesn't have value %d\n", value);
                }
                break;

            default:            // here for giggles
                printf("Oi! That's not a legal command\n");
        }
        
        scanf("%c", &cmd);      // get the next command
        while(isspace(cmd)) {
            scanf("%c", &cmd);
        }
        
    }
    
    return 0;
}