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


    int n;
    long int hsewa,tsewa,tbiaya,bayar,tkembalian,denda;
    char nbuku[100];
    int lama,kode,kode1;
     FILE *fp;
     char nama[100];
     char password[100];
   int logincntr=0;
int menu(){
int kode;
float hs;
rewind(fp);
system("cls");
printf("\t | 1. Tambahkan user                                    |\n");
printf("\t | 2. Login                                             |\n");
printf("\t | 3. Hapus Barang                                      |\n\n");
printf("\t  Masukan Menu : ");
scanf("%d",&n);
system("cls");
switch(n)
{    case 1: buat();    break;
    case 2: login();    break;
    case 3: hapus(); break;
    default:     system("cls");     menu();    break; }
 }
int buat()
{     fp= fopen("file.txt", "a+");
   printf("\t Masukan Username : ");

   scanf("%13s", nama);
   printf("\t Masukan Password : ");
   scanf("%13s",password);
   fprintf(fp,"%13s%13s \n",nama,password);
   system("cls");
   menu();
   strcpy(nama,NULL);
   strcpy(password,NULL);

fclose(fp);
}
int login()
{ if(logincntr>0)
    { system("cls");
    printf("Username Atau Password Salah Silahkan Login Kembali \n"); }
    fp = fopen("file.txt","r+");
    char usr[100];
    char pws[100];
    bool loginz;
    loginz=false;
    printf("\t Masukan Username :");
    scanf("%13s", usr);
    printf("\t Masukan Password :");
    scanf("%13s",pws);

while(!feof(fp))
    { fscanf(fp,"%13s%13s",nama,password);
    if((strcmp(nama,usr)==0)&&(strcmp(pws,password)==0))
    { loginz=true;
    break; } }

if(!loginz)
    { logincntr=1; login(); }
if(loginz)
    {
    system("cls");
    printf("\t\t |***************************************|\n");
    printf("\t\t | Login Berhasil Selamat Datang %s|\n",usr);
    printf("\t\t |***************************************|\n\n");
    } }
int hapus()
{ char phandler[100][100];
char uhandler[100][100];
fp=fopen("file.txt","r+");
int cntr; char admin[5]={'a','d','m','i','n'};
while(!feof(fp))
    { fscanf(fp,"%13s%13s",nama,password);
    strcpy(uhandler[cntr],nama); strcpy(phandler[cntr],password);
    cntr++; }
fclose(fp);
int i;
for (i=0;i<cntr-1;i++)
{ printf(" Username %s \n",uhandler[i]); }
    printf("Masukan Nama Yang Ingin Di Hapus : ");
    scanf("%s",nama);

    system("cls");

    printf("Anda Harus Memasukan Password Untuk Melanjutkan : ");
    scanf("%s",password);
    if(strcmp(password,admin)==0)
    { for(i=0;i<cntr;i++)
        { if(strcmp(uhandler[i],nama)==0)
            { int cntr2=i; simpan(cntr,cntr2,uhandler,phandler);
                break; } } }
fclose(fp); }
int simpan(int a,int b,char u[100][100],char p[100][100])
{ fopen("file.txt","w+");
    int i;
    for(i=0;i<a;i++)
        { if(i==b){ fprintf(fp," ");
        i+=1; }
        else if(i>b){ fprintf(fp,"%13s%13s\n",u[i],p[i]);

            }
        else{ fprintf(fp,"%13s%13s\n",u[i],p[i]); } }
        fclose(fp);
		menu(); }
int main()
{     fp= fopen("file.txt", "a+");
    if(fp == NULL){    printf("File Tidak Bisa Dibuka");    }
    else{ fclose(fp);
        menu();





        printf("\t | 1. Peminjaman Buku                           |\n");
printf("\t | 2. Pengembalian Buku                         |\n");
printf("\t | 3. Exit                                      |\n\n");
printf("\t  Masukan Menu : ");
scanf("%d",&n);
system("cls");
switch(n)
{    case 1: Peminjaman();    break;
    case 2: Pengembalian();    break;
    case 3: exit(1); break;
    default:     system("cls");     menu();    break; }
 }
 int pinjam ()
 {
   fp= fopen("file.txt", "a+");
	printf("\t| Kode Buku | Nama Buku |\n");
	printf("\t| 1 | Laskar Pelangi |\n");
	printf("\t| 2 | Harry Potter |\n");
	printf("\t| 3 | Keika Cinta Bertasbih |\n");
	printf("\t| 4 | Ayat-ayat Cinta |\n");
	printf("\t| 5 | Dilan 1990 |\n");
	printf("Pilih judul buku yang akan anda pinjam : ");
	scanf("%d",&kode);
	printf("\nHarga Sewa = Rp. 10.000,-\n");
printf("Denda/hari (Setelah hari ke-7) = Rp. 2000,-\n");
printf("\n");
fclose(fp);
}
int kembali()
{
	fp= fopen("file.txt", "a+");
	printf("\t| Kode Buku | Nama Buku |\n");
printf("\t| 1 | Sempak |\n");
printf("\t| 2 | Harry Potter |\n");
printf("\t| 3 | Keika Cinta Bertasbih |\n");
printf("\t| 4 | Ayat-ayat Cinta |\n");
printf("\t| 5 | Dilan 1990 |\n");
printf("Pilih judul buku yang akan anda kembalikan : ");
scanf("%d",&kode1);
printf("Durasi Anda Meminjam : ");
scanf("%d",&lama);

//Perhitungannya
if(kode==1)
{
hsewa=10000;
strcpy(nbuku,"Sempak");
}
else if (kode==2)
{
hsewa=10000;
strcpy(nbuku,"Harry Potter");
}
else if (kode==3)
{
hsewa=10000;
strcpy(nbuku,"Ketika Cinta Bertasbih");
}
else if (kode==4)
{
hsewa=10000;
strcpy(nbuku,"Ayat-ayat Cinta");
}
else if (kode==5)
{
    hsewa=10000;
    strcpy(nbuku,"Dilan 1990");
}
else
printf("Kode yang Anda masukkan salah\n");

//Output


printf("\t\tNama Pelangan = %s\n",nama);

printf("Nama Buku yang dipinjam = %s\n",nbuku);
printf("Lama Sewa = %d hari\n",lama);
printf("Harga Sewa Perhari = Rp. %ld\n",hsewa);


tsewa=lama*hsewa;
printf("Total Harga Sewa Sebesar = Rp. %ld\n",tsewa);

if((lama>0)&&(lama<7))
{
denda=0;
}
else
{
denda=2000*(lama-7);
}
printf("Denda Sewa = Rp. %ld\n",denda);



tbiaya=tsewa+denda;
printf("Total Biaya yang harus dibayar = Rp. %ld\n",tbiaya);
printf("Biaya yang dibayar = Rp. ");
scanf("%ld",&bayar);

tkembalian=bayar-tbiaya;
printf("kembalian = Rp. %ld\n",tkembalian);

printf("\n");
printf("–Terima Kasih telah menggunakan program pengembalian buku ini–\n");
printf("\n");

fclose(fp);
	   }
}