//*******************************
//		前臺(tái)銷售模塊
//*******************************
#include<iostream.h>
#include<iomanip.h>
#include<fstream.h>
#include<stdlib.h>
#include<windows.h>
#include<time.h>
//#include"book.h"
#include"booksale.h"

int match(char *);
void showtime();

void sale()
{
	book p;
	booksale bs[50];		//假設(shè)客戶一次最多買書的種類不超過(guò)50
//	int species=0;			//用于記錄書庫(kù)中實(shí)際書的種類數(shù) 
	int i=0,flag=-1;
	int n=0;				//購(gòu)買一本書的數(shù)量
	int size=0;				//記錄客戶實(shí)際購(gòu)買書的種類數(shù)

	char cname[51],ch='0',again='0';
	
	fstream file("book.dat",ios::in|ios::out|ios::binary);
	if(!file)
	{
		cout<<"\n\n\t打開文件失敗!"<<endl;
		exit(1);
	}
	
	do
	{
		system("cls");
		cout<<"\n\n\n\t請(qǐng)輸入你要購(gòu)買數(shù)的書名：";
		cin>>cname;
		cin.ignore();
		cout<<endl;
		flag=match(cname);		
	
		if(flag==0)
		{
			cout<<"查無(wú)此書！"<<endl;
			system("pause");
		}
		else
		{	
			file.seekg(0l,ios::beg);
			while(!file.eof())
			{
				file.read((char*)&p,sizeof(p));
				if(strcmp(cname,p.getbookname())==0)
					break;
			}
			cout<<"你要的書的信息如下:"<<endl;
			cout<<p;
		
			cout<<endl<<"請(qǐng)輸入要買書的數(shù)量：";
			cin>>n;
			if(n>p.getvolumn())
			{
				cout<<"\n對(duì)不起,你要的數(shù)量已超過(guò)該書的庫(kù)存量"<<p.getvolumn()<<endl;
			}
			if(n<=p.getvolumn())
			{
				bs[i].setbookname(p.getbookname());
				bs[i].setisbn(p.getisbn());
				bs[i].setnum(n);
				bs[i].setretail(p.getretail());
				i++;
			}
		}
		cout<<"\n繼續(xù)購(gòu)買其他書請(qǐng)按y鍵"<<endl;
		cout<<"\n按其他任意鍵結(jié)束本次購(gòu)買！"<<endl;
		cout<<"\n請(qǐng)輸入:";
		cin>>again;
		cin.ignore();
	}while(again=='y');

	file.close();
	size=i;

	if(i==0)
	{
		
		cout<<"\t\t謝謝光臨!歡迎下次再來(lái)!"<<endl;
		system("pause");
		return;
	}
	if(again!='y'&&i>0&&size<=50)
	{	
		system("cls");
		
		cout<<"\n\n\t\t\t前臺(tái)銷售模塊"<<endl<<endl;
		showtime();
		cout<<"--------------------------------------------------------------------------------";
		for(i=0;i<size;i++)
		{
			cout<<setw(8)<<"數(shù) 量"
				<<setw(13)<<"ISBN號(hào)"
				<<setw(20)<<"書   名"
				<<setw(15)<<"單 價(jià)"
				<<setw(15)<<"金  額"<<endl;
			cout<<setw(8)<<bs[i].getnum()
				<<setw(13)<<bs[i].getisbn()
				<<setw(20)<<bs[i].getbookname()
				<<setiosflags(ios::fixed)
				<<setprecision(2)
				<<setw(15)<<bs[i].getretail()
				<<setw(15)<<bs[i].getretail()*bs[i].getnum()<<endl;
			bs[i].setaccount(bs[i].getretail()*bs[i].getnum());
		}
		cout<<"--------------------------------------------------------------------------------"<<endl;
		
		cout<<"\t\t銷售合計(jì):"<<"  ￥"<<bs[0].getaccount()<<"元"<<endl;
		cout<<"\t\t零售稅  :"<<"  ￥"<<bs[0].getaccount()*bs[0].getrate()<<"元"<<endl;
		cout<<"\t\t應(yīng)付總額:"<<"  ￥"<<bs[0].getaccount()*(1+bs[0].getrate())<<"元"<<endl;
		cout<<"--------------------------------------------------------------------------------";
		cout<<"\n\n\t\t\t謝謝光臨!"<<endl<<endl<<endl;
		system("pause");

// 創(chuàng)建銷售日志
		struct tm *times;
		time_t t;
		t=time(0);
		times=localtime(&t);
		
		fstream outf("salelog.txt",ios::out|ios::app);
		if(!outf)
		{
			cout<<" 創(chuàng)建銷售日志失敗!"<<endl;
			system("pause");
		}
		outf<<"--------------------------------------------------------------------------------"<<endl;
//把時(shí)間寫入銷售日志里
		outf<<(times->tm_year+1900)<<"年"
			<<(times->tm_mon+1)<<"月"
			<<times->tm_mday<<"日"<<endl<<endl;
		for(i=0;i<size;i++)
		{
			outf<<i+1<<". "
				<<"  書 名 :"<<bs[i].getbookname()
				<<"  ISBN號(hào) :"<<bs[i].getisbn()
				<<"  單 價(jià) :"<<bs[i].getretail()<<"元"
				<<"  數(shù) 量 :"<<bs[i].getnum()<<"本"
				<<"  金 額 :"<<bs[i].getretail()*bs[i].getnum()<<"元"<<endl;
		}
		outf<<endl;
		outf<<"銷售合計(jì):"<<bs[0].getaccount()<<"元"<<endl
			<<"零售稅  :"<<bs[0].getaccount()*bs[0].getrate()<<"元"<<endl
			<<"銷售總額:"<<bs[0].getaccount()*(1+bs[0].getrate())<<"元"<<endl;
		outf<<"--------------------------------------------------------------------------------"<<endl;
		outf.close();
//在book.dat保存銷售后的信息
		file.open("book.dat",ios::in|ios::out|ios::binary);
		if(!file)
		{
			cout<<"書庫(kù)數(shù)據(jù)更新失敗!"<<endl;
			system("pause");
			exit(1);
		}
		for(i=0;(i<size)&&(!file.eof());i++)
		{
			file.read((char*)&p,sizeof(p));
			if(strcmp(bs[i].getbookname(),p.getbookname())==0)
			{
				p.setvolumn(p.getvolumn()-bs[i].getnum());
				file.seekp(-(long)sizeof(p),ios::cur);
				file.write((char*)&p,sizeof(p));
			}
		}
		file.close();
	}
}