#include <stdio.h>
#include <conio.h>

int i=1, chon1, ga =0, bo=0, tc=0, nc=0, khan=0;        // Khai bao cac bien chi so luong san pham
int ga_c = 35000, bo_c = 35000, tc_c = 45000, nc_c = 5000, khan_c = 1000;  // Khai bao gia cua san pham
char BangGia();     // Khai bao lenh BangGia() de in bang gia
void HoaDon();      //Khai bao lenh HoaDon() de thuc hien viec nhap va in hoa don, chi tiet hon o ben duoi, sau phan main
void ChinhGia();    //Khai bao lenh ChinhGia

int main(){
    ga =0; bo=0;tc=0;nc=0;khan=0;
    for(;;){
    printf("\n*******************************");
    printf("\n*      Quan Ly Tiem Pho       *");
    printf("\n*******************************");

    printf("\nThao tac: \n1. Nhap/In hoa don \n2. Chinh sua gia tien\n3. Thoat");
    printf("\n--> ");
    scanf("%d", &chon1);

    while(chon1<1||chon1>3){
        printf("Xin hay nhap lai thao tac (1 - 3)\n--> ");
        scanf("%d", &chon1);
    }

    switch(chon1){
            case 1:
                HoaDon();
                break;
            case 2:
                ChinhGia();
                break;
            case 3:
                return 0;
        }



/*
    */
    fflush(stdin);
    }
    getch();
    return 0;
}

char BangGia(){
    printf("\n*******************************");
    printf("\n*        ---Bang Gia---       *");
    printf("\n* 1. Pho Ga %13d VND *",ga_c);
    printf("\n* 2. Pho Bo %13d VND *",bo_c);
    printf("\n* 3. Pho Thap Cam %7d VND *",tc_c);
    printf("\n* 4. Nuoc %15d VND *",nc_c);
    printf("\n* 5. Khan Lanh %10d VND *",khan_c);
    printf("\n*                             *");
    printf("\n*******************************");
}

void HoaDon(){
    int chon2;
    char ten[100] ="", sdt[50] ="", trong[50]=""; // Khai bao ten va SDT thuoc dang char, con so trong [] thi cung chua ro lam, tham khao tren mang thay vay


    printf("\n*******************************");
    printf("\n*  ---Nhap / Xuat Hoa Don---  *");
    printf("\n* 1. Nhap Ten Khach           *");
    printf("\n* 2. Nhap SDT                 *");
    printf("\n* 3. Nhap so Pho Ga           *");
    printf("\n* 4. Nhap so Pho Bo           *");
    printf("\n* 5. Nhap so Pho Thap Cam     *");
    printf("\n* 6. Nhap so Nuoc             *");
    printf("\n* 7. Nhap so Khan             *");
    printf("\n* 8. Hoan tat va in Hoa Don   *");
    printf("\n* 9. Quay lai                 *");
    printf("\n*                             *");
    printf("\n*******************************");

    fflush(stdin);
    while(chon2 != 9){                  // Neu tuy chon khong phai la so 9, thi lap lai cac lenh trong day
    printf("\nHay nhap so (1-9): ");
    scanf("%d", &chon2);

    while(chon2<1||chon2>9){            // Bat buoc phai chon tu 1 - 9
        printf("\nXin hay nhap lai so (1-9): ");
        scanf("%d", &chon2);
    }
    fflush(stdin);

        switch(chon2){
        case 1:
            printf("--> Ten khach thu %d: ", i);
            gets(ten);   // Khong dung scanf duoc, neu dung scanf thi luc xuat ra ten se khong day du
            break;

        case 2:
            printf("--> SDT: ");
            gets(sdt);  // Cai nay cung vay
            break;

        case 3:
            printf("-->Pho ga: ");
            scanf("%d", &ga);
            break;

        case 4:
            printf("-->Pho bo: ");
            scanf("%d", &bo);
            break;

        case 5:
            printf("-->Pho thap cam: ");
            scanf("%d", &tc);
            break;

        case 6:
            printf("-->Nuoc: ");
            scanf("%d", &nc);
            break;

        case 7:
            printf("-->Khan lanh: ");
            scanf("%d", &khan);
            break;

        case 8:
            if(ga*ga_c+ bo*bo_c+tc*tc_c+nc*nc_c+khan*khan_c==0){  // Neu tong gia tien = 0 thi quay lai tu dau
                printf("Xin hay nhap so lieu!");
            }
            else{   // con khong thi xuat hoa don
                printf("\n+++++++++++++++++++++++++++++++++++++");
                printf("\n+++++++++++++++Hoa Don+++++++++++++++");
                if(ten!=trong){
                    printf("\n+ Khach hang: %21s +", ten);
                }
                if(sdt!=""){
                    printf("\n+ SDT: %28s +", sdt);
                }

                printf("\n+ --------------------------------- +");
                if(ga!=0){              //Dung lenh if de khi so luong san pham khac 0 se in ra, con so luong = 0 thi no se khong lam gi het
                    printf("\n+ Pho ga: %6d x %d = %8d +", ga,ga_c, ga*ga_c);
                }
                if(bo!=0){
                    printf("\n+ Pho bo: %6d x %d = %8d +", bo, bo_c, bo*bo_c);
                }
                if(tc!=0){
                    printf("\n+ Pho thap cam:%d x %d = %8d +", tc, tc_c, tc*tc_c);
                }
                if(nc!=0){
                    printf("\n+ Nuoc:   %7d x %d = %8d +", nc, nc_c, nc*nc_c);
                }
                if(khan!=0){
                    printf("\n+ Khan lanh: %4d x %d = %8d +", khan, khan_c, khan*khan_c);
                }
                printf("\n+ --------------------------------- +");
                printf("\n+ Tong cong: %22d +", ga*ga_c+ bo*bo_c+tc*tc_c+nc*nc_c+khan*khan_c);
                printf("\n+                                   +");
                printf("\n+ Xin cam on quy khach!             +");
                printf("\n+++++++++++++++++++++++++++++++++++++");
                printf("\n+++++++++++++++++++++++++++++++++++++\n\n\n");
                fflush(stdin);
                 i= i+1;
                printf("Bam nut bat ki de tiep tuc...\n");
                getch();
                return;
            } //dong if
        fflush(stdin);
        }   //dong while

    }       //dong while

}           //dong HoaDon


void ChinhGia(){
    BangGia();
    printf("\nThao tac: \n1. Chinh gia Pho Ga\n2. Chinh gia Pho Bo\n3. Chinh gia Pho Thap Cam\n4. Chinh gia Khan Lanh\n5. Chinh gia Nuoc\n6. Thoat");
    printf("\n--> Phan nay chua lam xong :v \n ");
}