//Project C Language
//Library System
//CreateBy
//1.Kriangkrai Aroontheerapoj Sec.3 ID:5488026
//2.
//3.

//======================= Declaration ===================================//
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<time.h>

void chkUsrOrStaff(int);
void chkMember(int);
void wantToDo(int);
int registMember(char);
int addBook(char);
int removeBook(char);
int OverDue(char);
int borrowBook();
int returnBook();

struct usernamepassword
{
    char username[8+1];
    char password[8+1];
};
struct book
{
    char bookID[8+1];
    char bookName[500+1];
};

struct usernamepassword user[100];
struct usernamepassword chkuser[1];
struct book book[100];
struct book chkbook[1];
int i=0,count=0;
FILE *fid;
FILE *fie;
//======================= Main Function ===================================//
int main()
{
    int usrOrStaff;
    printf("\n\n====== Welcome to Library System ======\n\n");
    printf("Who are You?\n");
    printf("1. User\n");
    printf("2. Staff\n\n");
    printf("Enter 1 or 2: ");
    scanf("%d",&usrOrStaff);
    system("cls");
    chkUsrOrStaff(usrOrStaff);
getch();
return 0;
}
//======================= check User Or Staff ===========================//
void chkUsrOrStaff(int usrOrStaff)
{   int memOrNot;
    if(usrOrStaff==1)
    {
        printf("\n\nYou are User");
        printf("\n\n========================================\n\n");
        printf("Are you Member?\n");
        printf("1. Yes\n");
        printf("2. No\n\n");
        printf("Enter 1 or 2: ");
        scanf("%d",&memOrNot);
        system("cls");
        chkMember(memOrNot);
    }
    else if(usrOrStaff==2)
    {
        printf("You are Staff");
    }
}
//========================== check Member ==============================//
void chkMember(int memOrNot)
{   int chkWant,chkUsr,chkPsw,chkRegis,count;
    struct usernamepassword regUser[1];

    if(memOrNot==1)
    {
        printf("\n\nYou are member");
        printf("\n\n====== Plese enter username and password ====== \n\n");

        fid = fopen("user.txt","r");
        if(!(fid==NULL))
        {
            while(!feof(fid))
            {
                fscanf(fid,"%s %s \n",user[i].username,user[i].password);
                i++;
                count++;
            }
        }
        do
        {
            printf("\nEnter username: ");
            scanf("%s",&chkuser[0].username);
            printf("Enter password: ");
            scanf("%s",&chkuser[0].password);
            for(i=0;i<count;i++)
            {
                chkUsr=strcmp(chkuser[0].username,user[i].username);
                chkPsw=strcmp(chkuser[0].password,user[i].password);
                if(chkUsr==0 && chkPsw==0)
                {
                    break;
                }
            }
        }while(chkUsr!=0 || chkPsw!=0);
        fclose(fid);
        printf("Password Correct");
        system("cls");
        printf("\n\n========== Welcome ==========\n\n");
        printf("---- What do you want to do? ----\n");
        printf("1.Borrow Book(s)");
        printf("\n2.Return Book(s)");
        printf("\n\nEnter 1 or 2: ");
        scanf("%d",&chkWant);
        wantToDo(chkWant);
    }
    else if(memOrNot==2)
    {
        printf("You are non-member\n");
        printf("\n==========================\n");
        printf("What do you want to do\n\n");
        printf("1. Register\n");
        printf("2. Exit\n\n");
        printf("Enter 1 or 2: ");
        scanf("%d",&chkRegis);
        if(chkRegis==1)
        {
            system("cls");
            fid = fopen("user.txt","a+t");
            printf("======= Register System =======\n\n");
            printf("Enter username: ");
            scanf("%s",regUser[0].username);
            printf("Enter password: ");
            scanf("%s",regUser[0].password);
            fprintf(fid,"\n%s \t %s",regUser[0].username,regUser[0].password);
            printf("\nRegister Successful.");
            printf("\n\nNow you can login and borrow/return book(s).");
            fclose(fid);
            getch();
            system("cls");
            memOrNot=1;
            chkMember(memOrNot);
        }
        else if(chkRegis==2)
        {
            exit(1);
        }
    }
}
//========================== Check What User Want to do======================//
void wantToDo(int chkWant)
{
     if(chkWant==1)
     {
         borrowBook();
     }
     else if(chkWant==2)
     {
     }
}
//========================== Borrow Books system ============================//
int borrowBook(int qty)
{
    int qtyBorrow,chkBookID,j,chk;
    char borrowBookID[8];
    system("cls");
    printf("\n\n====== Borrow Book(s) System ======\n\n");
    do
    {
        printf("How many Book(s) that you want to Borrow(Maximum 5): ");
        scanf("%d",&qtyBorrow);
    }while(qtyBorrow>5);

    fie = fopen("book.txt","r");
    if(!(fie==NULL))
    {
        while(!feof(fie))
        {
            fscanf(fie,"%s\n",book[i].bookID);
            fgets(book[i].bookName,51,fie);
            i++;
            count++;
        }
    }
    for(i=0;i<count;i++)
    {
        printf("%s\t%s",book[i].bookID,book[i].bookName);
    }
    for(i=0;i<qtyBorrow;i++)
    {
        printf("\n\nEnter %d book ID: ",i+1);
        scanf("%s",&borrowBookID[i]);
    }
    printf("\nYou borrow:\n");
    for(i=0;i<qtyBorrow;i++)
    {   for(j=0;j<count;j++)
        {
            if(strcmp(&borrowBookID[i],book[j].bookID)==0)
            {
                chk=j;
                break;
            }
        }
        printf("%s\t%s",book[chk].bookID,book[chk].bookName);
    }
}