/* Author:  Susan Mitchell */
/* File  :  Inventory.c    */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Inventory.h"

/* The "static" reserved word restricts the scope of a variable   */
/* to the file in which it resides.  Therefore, "head" and "tail" */
/* are not global to the entire program.                          */

static CdNode* head;
static CdNode* tail;

void initializeList() {

    head = NULL;
    tail = NULL;
}

CdNode* createNode(Cd* aCd) {

    CdNode* temp = (CdNode*) malloc(sizeof(CdNode));

    temp->info = aCd;
    temp->next = NULL;
    return temp;
}

void destroyNode(CdNode* aCd) {

    destroyCd(aCd->info);
    free(aCd);
}

void emptyList(){

    CdNode* currNode;
    CdNode* nextNode;

    currNode = head;
    while (currNode != NULL) {
        nextNode = currNode->next;
        destroyNode (currNode);
        currNode = nextNode;
    }
    initializeList();
}

void insertNode(Cd* aCd) {

    /*  Complete this function  */

}

void deleteOutOfStock(){

    /*  Complete this function */

}

CdNode* findNode (char* artist, char*title) {

    /*  Complete this function  */

}

int computeNumNodes() {

    /*  Complete this function  */
	
}

float computeValue() {

    /*  Complete this function */

}

void printList() {

    CdNode* currNode;

    if (head == NULL)
       	printf("List is empty\n");
    else {
	currNode = head;
	while (currNode != NULL) {
	   printCd(currNode->info);
	   currNode = currNode->next;
	}
    }
}

void printOutOfStock() {

    /*  Complete this function  */

}