#include<stdlib.h>
#include<string.h>
#include<stdio.h>
//#include "cipher.c"


typedef struct node {
    char *username;
    char *password;
    char *usertype;
    struct node * next;
} llnode;

llnode* head;

int menu(void);


int addNode(char *username, char *password, char *usertype){
    llnode *addNode = (llnode *)malloc(sizeof(llnode));
    llnode *temp = (llnode *)malloc(sizeof(llnode));

    temp  = head;

    while (temp != NULL){
     temp = temp -> next;
    }

    temp -> next = addNode;

    addNode -> username = username;
    addNode -> password = password;
    addNode -> usertype = usertype;
    addNode -> next = NULL;

    printf("%s , %s, %s", username, password, usertype);

}





int add(char *user, char* pass, char* usertype){
        printf("boooo2323");
        fflush(stdout);
        //FILE *file = fopen("password.csv", "at");
        //decrypt(file);
        printf("yoyoyo");
        //loadToLinkedList(file);
        llnode *temp = (llnode *)malloc(sizeof(llnode *));
        temp = head;
        temp = temp -> next;
        printf("boooo3");

        while(temp != NULL){
            if (strcmp(user, temp -> username)){
                temp = temp -> next;
            }
            else if (!strcmp(pass, temp -> password) && !strcmp(usertype, temp -> usertype)){
                printf("This record already exists!");
            }

        }

        addNode(user, pass, usertype);
        //backToTheFile(file);
        //encrypt(file);
        //fclose(file);

   return 0;
}

int delete(char * username){
            FILE *file = fopen("paswords.csv", "at");
        llnode *temp = (llnode *)malloc(sizeof(llnode *));
        llnode *cur = (llnode *)malloc(sizeof(llnode *));
        llnode *pcur = (llnode *)malloc(sizeof(llnode *)); //keeps track of previous node
        pcur = head;

        //decrypt(file);
        loadToLinkedList(file);
        cur = head -> next;

        while (cur != NULL){
            if (strcmp(username, cur -> username)){
                cur = cur -> next;
                pcur = pcur -> next;
            }
            else {
                pcur -> next = cur -> next;
                temp = cur;
                cur -> next = NULL;

            }
            if (strcmp(username, cur -> username) && cur -> next == NULL){
                printf("This record does not exist!");
            }

        }

        //addNode(username, pass, usertype);
        backToTheFile(file);
        //encrypt(file);
        fclose(file);

   return 0;

        }


int edit(char *user1, char *user2, char *pass2, char* usertype2){
    delete(user1);
    add(user2, pass2, usertype2);

}


int verify(char *username, char* password){
        //FILE *file = fopen("passwords.csv", "wt");
        //decrypt(file);
        //loadToLinkedList(file);
        llnode *temp = (llnode *)malloc(sizeof(llnode *));
        temp = head;
        temp = temp -> next;
        int result;

        while(temp != NULL){
            if (strcmp(username, head -> username)){
                if (temp -> next == NULL){
                    printf("INVALID\n");
                    result = EXIT_FAILURE;
                    break;
                }
                else
                    temp = temp -> next;
            }
            else if (!strcmp(password, temp -> password)) {
                printf("VALID\n");
                result = EXIT_SUCCESS;
                break;
            }

        }

        //backToTheFile(file);
        //encrypt(file);
        //fclose(file);

        return result;


}



int menu(void){
    FILE *passwords = fopen("password.csv", "at");
    int choice;
    char *username = (char *)malloc(20*sizeof(char));
    char *password = (char *)malloc(20*sizeof(char));
    char *usertype = (char *)malloc(20*sizeof(char));
    char *user2 = (char *)malloc(20*sizeof(char));
    char *pass2 = (char *)malloc(20*sizeof(char));
    char *type2 = (char *)malloc(20*sizeof(char));






while(1){
printf("  Menu \n ---------- \n choose one of the following options:\n 1. add a record\n2. delete a record\n3. edit a record\n4. login verification\n5. quit\n");
scanf("%d", &choice);

switch(choice){

case 1:

    printf("enter a username: \n");
    scanf("%s", username);
    printf("enter a password: \n");
    scanf("%s", password);
    printf("enter the user's type: \n");
    scanf("%s", usertype);

    add(username, password, usertype);
    break;

case 2:

      printf("enter the username contained in the record you would like to delete: \n");
      scanf("%s", username);

      delete(username);


      break;

case 3:
    printf("Enter the username contained in the record you would like to edit: \n");
    scanf("%s", username);
    printf("Enter the username of the new record: \n");
    scanf("%s", user2);
    printf("Enter the password of the new record: \n");
    scanf("%s", pass2);
    printf("Enter the type of the user: \n");
    scanf("%s", type2);

    edit(username, user2, pass2, type2);

    break;


case 4:

    printf("Enter your username: \n");
    scanf("%s", username);
    printf("Enter your password: \n");
    scanf("%s", password);

    verify(username, password);

    break;


case 5:
    backToTheFile(passwords);
    fclose(passwords);
    exit(0);
    break;

default:
    break;
}
}
//flose(password);
return 0;

}