// run_pay_calculator.cpp

#include "run_pay_calculator.h"

#include <fstream>
using std::ifstream;
using std::ofstream;

#include <iostream>
using std::cin;
using std::cout;
using std::endl;

#include <iomanip>
using std::fixed;
using std::setprecision;
using std::ws;

#include <string>
using std::string;
//using std::to_string;

#include <sstream>
using std::istringstream;
using std::ostringstream;

#include "Time.h"

inline string to_string(int x)
{
    ostringstream oss;
    oss << x;
    return oss.str();
}

void run_pay_calculator()
{
    cout << "Name of input file: ";
    string input_file_name;
    getline(cin, input_file_name);

    ifstream ifs_input(input_file_name);
    if (!ifs_input)
        throw PayCalculatorError("File " + input_file_name +
                                 " did not open");

    cout << "Name of output file: ";
    string output_file_name;
    getline(cin, output_file_name);

    ofstream ofs_output(output_file_name);
    if (!ofs_output)
        throw PayCalculatorError("File " + output_file_name +
                                 " did not open");

    string s_line;
    int line_number = 0;

    while (getline(ifs_input, s_line)) {
        ++line_number;

        // extract data from line
        int employee_number = -1;
        Time start_time, stop_time;
        istringstream iss_line(s_line);
        iss_line >> employee_number >> start_time >> stop_time;

        // check if an error occurred
        if (!iss_line)
            throw PayCalculatorError("Error in input file at line "
                                     + to_string(line_number));

        // check that rest of line is blank
        iss_line >> ws;
        if (!iss_line.eof())
            throw PayCalculatorError("Error in input file at line "
                                     + to_string(line_number));

        // compute pay
        double pay = (stop_time - start_time) * kPayRate;

        // print results
        ofs_output << employee_number << ' '
                   << start_time << ' ' << stop_time << " $"
                   << fixed << setprecision(2) << pay << '\n';
    }
}