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

#define MAX_CART 100

typedef char string15[16];
typedef char string20[21];
typedef char string50[51];
typedef char string8[9];
typedef struct{

    string20    first,
                middle,
                last;

}nameType;
typedef struct{

    nameType    name;
    string50    address;

}userInfoType;
typedef struct{

    string8 code;
    int qty;

}prodBoughtType;
typedef prodBoughtType arrBought[MAX_CART];
struct userTag{

    string15    username,
                password;

    userInfoType    info;

    char    type;
    float   creditlimit,
            outstanding;

    arrBought   cart;

    int items;

    struct userTag  *pNext;

};

typedef struct userTag userType;

typedef struct userTag * ptrUser;

void displayAll(ptrUser pUsers){

    while (pUsers != NULL){
        printf("%s\n", pUsers -> username);
        pUsers = pUsers -> pNext;
    }

}

void freeAll(ptrUser * pFirst){

    ptrUser pDel;

        while (*pFirst != NULL){
            pDel = *pFirst;
            *pFirst = (*pFirst) -> pNext;
            free(pDel);
        }
}

void getUserInfo(userInfoType *pInfo){

    printf("Enter Name \n");
        printf("First Name: "); fgets(pInfo -> name.first, 21, stdin);
        printf("Middle Name: "); fgets(pInfo -> name.middle, 21, stdin);
        printf("Last Name: "); fgets(pInfo -> name.last, 21, stdin);

    printf("%s,%s%s \n", pInfo -> name.last, pInfo -> name.first, pInfo -> name.middle);


    printf("Enter Address: "); fgets(pInfo -> address, 51, stdin);

    pInfo -> address[strlen(pInfo -> address) - 1] = '\0';
    pInfo -> name.first[strlen(pInfo -> name.first) - 1] = '\0';
    pInfo -> name.middle[strlen(pInfo -> name.middle) - 1] = '\0';
    pInfo -> name.last[strlen(pInfo -> name.last) - 1] = '\0';

}

void signUp(userType *pUser){

	string8 tempcode;
    char cDump;
    char acode[9]={"DLSU2017"};

    do{

    printf("Enter username: "); scanf("%s%c", (*pUser).username, &cDump);

    }while (strlen((*pUser).username) < 3 || strlen((*pUser).username) > 15);

    do{

    printf("Enter password: "); scanf("%s%c", pUser -> password, &cDump);

    }while (strlen(pUser -> password) < 6 || strlen(pUser -> password) > 15);

 	do{

 	printf("Type A for Admin and S for Shopper: "); scanf("%c%c", pUser->type, &cDump);
	if(pUser->type == 'A' || pUser->type == 'a')
		printf("Enter authorization code: "); scanf("%s%c",&tempcode,&cDump);
		while(strcmp(acode, tempcode)!=0)
 		printf(" Wrong Authorization Code try again");

	if(pUser->type == 'S' || pUser->type == 's')
		printf("Congratulations you are now registered as a shopper!");

	}while (pUser->type != 'A' && pUser->type != 'a' && pUser->type != 'S' && pUser->type != 's');

    getUserInfo(&pUser -> info);

}

void displayAllRecur(ptrUser pUsers){

    if (pUsers != NULL){
        printf("%s\n", pUsers -> username);
        displayAllRecur(pUsers -> pNext);
    }
}

ptrUser search(ptrUser pFirst, string15 username){

    ptrUser pRun;
    pRun = pFirst;

    while (pRun != NULL && strcmp(username, pRun -> username) != 0){

        pRun = pRun -> pNext;

    }

    return pRun;

}

void deleteNode(ptrUser *pFirst, string15 username){

    ptrUser pFind, pRun;

    if (*pFirst == NULL)
        printf("The List is empty");

    else {

        pFind = search(*pFirst, username);
        if (pFind == NULL)

            printf("%s is not in the List\n", username);

        else { //found the node to be deleted

            if(pFind == *pFirst){ //deleting first node

                *pFirst = (*pFirst) -> pNext;

            }

            else{ //delete from middle or end

                pRun = *pFirst;
                while (pRun -> pNext == pFind)
                    pRun = pRun -> pNext;

                pRun -> pNext = pFind -> pNext;

            }

            free(pFind);
            pFind = NULL;

        }

    }

}

void login(userType *pUsers, userInfoType *pInfo){
	int ctr;
	string15 userchk, passchk;

	do{
	printf("Enter Username:");scanf("%s",&userchk);
	printf("Enter Password:");scanf("%s",&passchk);
	while(pUsers != NULL){
	if(strcmp(pUsers -> username, userchk)!=0)
	{
		pUsers = pUsers->pNext;
		printf("Username Invalid try again");
	}
	else if(strcmp(pUsers -> username, userchk)==0 && strcmp(pUsers -> password, passchk)!=0)
	{
		pUsers = pUsers->pNext;
		printf("Incorrect Password try again");
		ctr++;
	}
	else if(strcmp(pUsers -> username, userchk)==0 && strcmp(pUsers -> password, passchk)==0)
	{
		if(pUsers->type=='A' || pUsers->type == 'a')
			printf("going to admin menu");
		else
			printf("welcome to the shopper menu");

	}
						 }
	}while(ctr<=3);
	printf("counter exceeded account locked");

}


int main(){

/*
    userType    user;
    userType    *pUsers = NULL,
                *pNew;
*/
    ptrUser pUsers = NULL,
            pNew, pLast;

    int opt,n;
    char cDump;
    ptrUser pRun, pTrail;

 	printf("Welcome to the shopping kiosk\n\n");
 	printf("type 1 if you would like to log in\n0 if you would like to sign up: ");
 	scanf("%d",&n);

switch(n){

 	case 1:login(pUsers, &pUsers->info);break;

 	default: do{
/*
    pNew = malloc(sizeof(userType));

    signUp(pNew);
    pNew -> pNext = NULL;

    if (pUsers == NULL)
        pUsers = pNew;

    else
        pLast -> pNext = pNew;

    pLast = pNew;
*/

    pNew = malloc(sizeof(userType));

    signUp(pNew);
    pNew -> pNext = NULL;

    if (pUsers == NULL) //if list is empty
        pUsers = pNew;

    else if (strcmp(pUsers -> username, pNew -> username) > 0){ //conect as first node

        pNew -> pNext = pUsers;
        pUsers = pNew;

    }

    else { //modifying middle of list

        pRun = pUsers;
        while (pRun != NULL && strcmp(pRun -> username, pNew -> username) < 0){

        pTrail = pRun;
        pRun = pRun -> pNext;

        }

        pTrail -> pNext = pNew;
        pNew -> pNext = pRun;

    }
    printf("Type '1' to enter another user. Type '0' to display all users. "); scanf("%d%c", &opt, &cDump);

    } while (opt == 1);

    displayAllRecur(pUsers);
    //displayAll(pUsers);
    break;
}
    freeAll(&pUsers);

    return 0;
}