//***************************************************
//      Filename: payroll.cpp
//1,Check data in two files and report the error;
//2,Calculate the pay and report. 

//***************************************************
#include<iostream>
#include<fstream>  //for file I/O
#include<string>
#include<iomanip>

using namespace std;

struct TransRec
{
	string id;     // 3 digit , for example 002
	int jobSite;   // 1 for New York, 2 for Washington, 3 for Chicago
	int workHour; // from 0 to 72
};

struct MasterRec
{
	string id;
	string name;
	float payRate;    // Pay rate per hour
	int dependent;    // Number of dependent
	int employeeType; // 1 for management, 0 for union
	int jobSite;
	char sex;         // M for male, F for female
};

void OpenForInput( ifstream& );        // open input file
void OpenForOutput( ofstream& );       // open output file
void InTransRec(ifstream&,TransRec&);  // read in data in Transaction file
void InMasterRec(ifstream&,MasterRec&);// read in data in Master file
float GrossPay(int,float,int);         // Calculate the gross pay for every employee 
float Tax(float,int);                  // Calculate the net pay for every employee

int main()
{
	ifstream trans;        // Input stream for transaction file
	ifstream master;       // Input stream for master file
	ofstream errControl;   // Output stream for error and control report
	ofstream payroll;      // Output stream for payroll report
	TransRec rec1;         // Record in transaction file
	MasterRec rec2;        // Record in master file
	string SiteName;       // Name of job site 
	int corrRec=0;         // Num of correct record
	float gPay;            // Gross pay of every employee 
	float nPay;            // Net pay of every employee 
	float totGrossPay=0;   // Total gross pay
	float totNetPay=0;     // Total net pay

	// Open and check Transaction File
    cout << " Processing Transaction File Begins:" << endl;
	OpenForInput(trans);
	if(!trans)
	{
		cout<<"Cannot open transaction file. Program terminated."<<endl;
		return 1;
	}
    // Open and check Master File
    cout << " Processing Master File Begins:" << endl; 
	OpenForInput(master);
	if(!master)
	{
		cout<<"Cannot open master file. Program terminated."<<endl;
		return 1;
	}
	// Open output files, set output format and print heading
	cout << "(File for Error and Control Report)" << endl;
	OpenForOutput(errControl);
	cout << "(File for Payroll Report)" << endl;
	OpenForOutput(payroll);
	errControl << fixed << showpoint << setprecision(2);
	payroll << fixed << showpoint << setprecision(2);
    payroll << "    Name     ID     Job-site     Gross-pay   Net-pay" << endl;//heading
        	//  12345678901234567890123456789012345678901234567890123
	// Read in data and process
	InTransRec(trans, rec1);
    InMasterRec(master, rec2);
	while(trans && master)
		if(rec1.id != rec2.id)
		{
		  errControl << rec1.id << "'s record isn't found in master file." << endl;
		  InTransRec(trans, rec1); // read in new data and update loop condition
		}
		else if(rec1.jobSite != rec2.jobSite)
		{
		  errControl << rec1.id << "'s job site does not match that in master file."<<endl;
		  //read in new data and update loop condition
		  InTransRec(trans, rec1);   
		  InMasterRec(master, rec2);
		}
		else
		{  
		  corrRec++; // count the number of records processed correctly 
		  gPay=GrossPay(rec1.workHour,rec2.payRate,rec2.employeeType);
		  totGrossPay +=gPay; // add every grosspay to total grosspay
		  nPay=gPay-Tax(gPay,rec2.dependent);
		  totNetPay +=nPay;   // add every netpay to total netpay
          if (rec2.jobSite == 1) // change job site number to city name
             SiteName="New York";
          else if (rec2.jobSite == 2)
             SiteName="Washington";
          else
             SiteName="Chicago";  
		  // output data to payroll file
		  payroll<<rec2.name    
			     <<setw(12-rec2.name.length())<<' '<<left<<rec2.id
				 <<setw(5)<<' '<<left<<SiteName
                 <<setw(14-SiteName.length())<<' '<<left<<gPay
				 <<setw(6)<<' '<< left <<nPay<< endl;
		  //read in new data and update loop condition
		  InTransRec(trans, rec1);
		  InMasterRec(master, rec2);
		}

	// Output total number
	errControl<<endl<<"The total number of employee records that were processed correctly is "<<corrRec
			  <<"." <<endl;
	payroll<<endl
		   <<"The total amount of gross pay is "<<totGrossPay<<"." <<endl
		   <<"The total amount of net pay is "<<totNetPay<<"." <<endl;

	return 0;
}

//******************************************************************
void OpenForInput(/* inout*/ifstream& someFile)// File to be opened
{
    string fileName;    // User-specified file name

    cout << "Input file name for reading in data: ";
    cin >> fileName;

    someFile.open(fileName.c_str());
    if ( !someFile )
        cout << "** Can't open " << fileName << " **" << endl;
}
//******************************************************************
void OpenForOutput( ofstream& someFile)// File to be opened
{
    string fileName;    // User-specified file name

    cout << "Input file name for saving data: ";
    cin >> fileName;

    someFile.open(fileName.c_str());
}
//********************************************************************
void InTransRec(ifstream &inFile,TransRec &rec)
// Input the transaction record
{
	inFile>>rec.id
		  >>rec.jobSite
		  >>rec.workHour;
}

//********************************************************************
void InMasterRec(ifstream &inFile,MasterRec &rec)
// Input the master record
{
	inFile>>rec.id
		  >>rec.name
		  >>rec.payRate
		  >>rec.dependent
		  >>rec.employeeType
		  >>rec.jobSite
		  >>rec.sex;
}

//********************************************************************
float GrossPay(int workHour,float payRate,int employeeType)
// If the employee type is union and work hour is larger than 40
// the pay rate is 1.5*previous payrate
{
	if(employeeType==1)
		return workHour*payRate;
	else if (workHour<=40 && employeeType==0)
		return workHour*payRate;
	else
		return 40*payRate + (workHour-40)*payRate*1.5;
}
//********************************************************************
float Tax(float grossPay,int dependent)
{
	double taxRate;
	double temp;
	if(dependent==1)
		taxRate=0.15;
	else
	{
	    temp=(1-dependent/(dependent+6.0))*0.15;
		taxRate=(temp>0.025)? temp : 0.025 ;
	}
	return grossPay*taxRate;
}