/* PROGRAM: Modify contents of phonebook
   AUTHOR: Tinashe Chapfunga and Brandon Le
   DATE: November 10, 2018
   PURPOSE: Modify contents of phonebook
   LEVEL OF DIFFICULTY: 10
   CHALLENGES: Nodes and array calling
   HOURS SPENT: 6
*/

#include <stdio.h>
#include "header.h"

int ExistingAreaCodeNums[5] = {613, 416, 647, 519, 905};
char *ExistingAreaCodeDesc[5] = {"Ottawa", "Toronto", "Toronto", "Windsor", "Niagra"};

/* return number of nodes in the list. */
int Length (struct node* head) {
	int count = 0;
	struct node* current = head;

	while (current != NULL) {
		count++;
		current = current->next;
	}
	return count;
}

/* Prints all the nodes on a list */
void PrintList(struct node* head) {
	struct node* current = head;

	if (current == NULL) {
		printf("Linked list is empty!\n");
		return;
	}

    printf("The list is: ");
	while (current != NULL) {
		printf("%d -> ", current->data);
		current = current->next;
	}

    printf("\n");
    return;

}

/*Given an int and a reference to the head pointer, add a new node at the head of the list. */
void Add(struct node** headRef, int new) {
	struct node* head;

	head = (struct node*) malloc(sizeof(struct node));
	head->data = new;
	head->next = *headRef;
	*headRef = head;

	printf("New node added to the list.\n");
	return;
}

/*Takes a non-empty list, deletes the head node, and returns the head node's data.*/
int Delete(struct node** headRef) {
    struct node current;
    int val = 0;

    if (*headRef == NULL) {
        printf("List is empty. Nothing to delete.\n");
        return val;
    }

    current = *headRef;
    val = current->data;
    headRef = current->next;
    free(current);

    printf("The head is deleted.\n");
    return val;
}

/* Deallocates all of its memory and sets its head pointer to NULL*/
void ZeroList(struct node** headRef) {
    struct node p;

    if (headRef == NULL) {
        printf("List is empty, nothing to free\n");
        return;
    }

    while (headRef != NULL) {
        p = *headRef;
        *headRef = p->next;
        free(p);
    }

    printf("All nodes have been deleted.\n");
    return;
}





/* PROGRAM: Modify contents of phonebook
   AUTHOR: Tinashe Chapfunga and Brandon Le
   DATE: November 10, 2018
   PURPOSE: Modify contents of phonebook
   LEVEL OF DIFFICULTY: 10
   CHALLENGES: Nodes and array calling
   HOURS SPENT: 6
*/

#include <stdlib.h>

typedef struct Area{
	int areaCode;
	char areaName[20];
	struct Area *nextArea;
} Area;

typedef struct PhEntry{
	int areaCode;
	int phoneNumber;
	char firstName[20];
	char lastName[20];
	struct PhEntry *nextPhEntry;
} PhEntry;

int ExistingAreaCodeNums[5];
char *ExistingAreaCodeDesc[5];

int Length(struct node* head);
void PrintList(struct node* head);
void Add(struct node** headRef, int new);
int Delete(struct node** headRef);
void ZeroList(struct node** headRef);




/* PROGRAM: Modify contents of phonebook
   AUTHOR: Tinashe Chapfunga and Brandon Le
   DATE: November 10, 2018
   PURPOSE: Modify contents of phonebook
   LEVEL OF DIFFICULTY: 10
   CHALLENGES: Nodes and array calling
   HOURS SPENT: 6
*/

#include<stdio.h>
#include<stdlib.h>
#include "header.h"

int main(){
	char userInput = '0';

	while(userInput != 'q'){
		printf("Choose one of the following options:");
		printf("Press [1] to Enter Area information:");
		printf("Press [2] to Enter PhoneBook Entry:");
		printf("Press [3] to Modify an existing PhoneBook Entry:");
		printf("Press [4] to Delete an existing PhoneBook Entry:");
		printf("Press [5] to Delete an unused Area using doubly link list:");
		printf("Press [q] to quit:");
		scanf("%s", &userInput);

		switch(userInput){
			case 1 :
				int areaCode;
				int areaCodeCheck;
				char *areaDesc;

				printf("You pressed: 1");
				printf("Enter Area Code: ");
				scanf("%d", &areaCode);

				printf("\n");

				areaCodeCheck = areaCode/100;

				if((areaCodeCheck != 0)&&(areaCodeCheck != 1)){
					printf("Enter Area Description: ");
					scanf("%s", &areaDesc);
				}
				else{
					printf("Invalid Area Code.");
				}
				break;

			case 2 :
				int areaCode;
				int areaCodeCheck;
				int phoneNum;

				printf("You pressed: 2");
				printf("Enter Area Code: ");
				scanf("%d", &areaCode);

				printf("\n");

				areaCodeCheck = areaCode/100;

				if((areaCodeCheck != 0)&&(areaCodeCheck != 1)){
					printf("Enter 7-digit phone number: ");
					scanf("%d", &phoneNum);
				}
				else{
					printf("Invalid Area Code.");
				}
				break;

			case 3 :
				int areaCode;
				int areaCodeCheck;
				int phoneNum;
				char *lastName;

				printf("You pressed: 3");
				printf("Enter Area Code: ");
				scanf("%d", &areaCode);

				printf("\n");

				areaCodeCheck = areaCode/100;

				if((areaCodeCheck != 0)&&(areaCodeCheck != 1)){
					printf("Enter 7-digit phone number: ");
					scanf("%d", &phoneNum);

					printf("Enter last name: ");
					scanf("%s", &lastName);
				}
				else{
					printf("Invalid Area Code.");
				}
				break;

			case 4 :
				int areaCode;
				int areaCodeCheck;
				int phoneNum;
				char *lastName;

				printf("You pressed: 4");
				printf("Enter Area Code: ");
				scanf("%d", &areaCode);

				printf("\n");

				areaCodeCheck = areaCode/100;

				if((areaCodeCheck != 0)&&(areaCodeCheck != 1)){
					printf("Enter 7-digit phone number: ");
					scanf("%d", &phoneNum);

					printf("Enter last name: ");
					scanf("%s", &lastName);
				}
				else{
					printf("Invalid Area Code.");
				}
				break;

			case 5 :
				int areaCode;
				int areaCodeCheck;
				char *areaDesc;
				int phoneNum;
				char *lastName;

				printf("You pressed: 3");
				printf("Enter Area Code: ");
				scanf("%d", &areaCode);

				printf("\n");

				areaCodeCheck = areaCode/100;

				if((areaCodeCheck != 0)&&(areaCodeCheck != 1)){
					printf("Enter Area Description: ");
					scanf("%s", &areaDesc);
				}
				else{
					printf("Invalid Area Code.");
				}
				break;

			default:
				printf("Invalid Input");
				break;
		}
	}
}




CC = gcc
CC_FLAGS = -g -ansi -pedantic -Wall
FILES = main.c2, header.c, header.h
OUT_EXE = Assignment 2

build: $(FILES)
        $(CC) $(CC_FLAGS) -o $(OUT_EXE) $(FILES)

clean:
        rm -f *.o core *.exe *~

rebuild: clean build