//*********************************************************************
//*                                                                   *
//*     FILE NAME: gasMileage.cpp       Assignment: #1                *
//*                                                                   *
//*     AUTHOR: __________________________                            *
//*                 Tyler Knipfer                                     *
//*                                                                   *
//*     COURSE #: CSC 24400 11         DUE DATE: September 14th, 2012 *
//*                                                                   *
//*********************************************************************

//*************************Program Description*************************
//*                                                                   *
//* PROCESS: This program is designed to take input from a file that  *
//* will then calculate the the gas mileage (mpg) for each time the   *
//* driver stops and fills up the tank.                               *
//*                                                                   *
//*********************************************************************



#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

void readData(ifstream &readFile, char &model, int &startingDistance);
void printData(ofstream &outFile, int &beginningMileage, int &endingMileage, float &gasUsed, int &distanceDriven, float &mpg, float &totalGasUsed, int &totalDistance, float &totalMPG);
void printHeading(ofstream &outFile, char &model);
void computeMileage(int &beginningMileage, int &endingMileage, int &nextMileage, float &totalGasUsed, float &gasUsed, int &distanceDriven, float &mpg, float &totalMPG, int &totalDistance);
void printHeader(ofstream &outFile);
void printFooter(ofstream &outFile);

int main()
{
	char model = 0;			  //The first character in the file that represents the model of car
	int startingMileage = 0;  //The first odometer reading when starting their trip
	float gallonsUsed = 0;	  //The amount of gas they used after stopping
	int mileage = 0;     	  //The mileage after the first odometer reading
	int distanceDriven = 0;   //used to calculate the distance driven
	float mpg = 0;  		  //The mpg that they got after stopping for gas
	float totalMPG = 0;  	  //The total mpg for the entire trip
	int totalDistance = 0; 	  //The total distance that they have driven including in between stops
	int nextMileage = 0;
	float totalGasUsed = 0;

	//File to output the car data to
    ofstream outFile("outputFile.txt");

    //The main input file where all data is coming from
    ifstream inFile("data1.txt");

    //Get the initial model type from the file
    inFile >> model;

    //Get the initail startingMileage from the file
    inFile >> startingMileage;

    printHeader(outFile);

    printHeading(outFile, model);

    while(model != 'X')
    {
		inFile >> mileage;

		//If the mileage is equal to a negative number then we are done
		//with the current car and move to the next one and print it out
		if(mileage < 0)
		{
			//This is the start of a new car so all of the values need to be reset
			//to their starting point of zero and then reacalculate everything.
			model = 0;
			startingMileage = 0;
			gallonsUsed = 0;
			mileage = 0;
			distanceDriven = 0;
			mpg = 0;
			totalMPG = 0;
			totalDistance = 0;
			nextMileage = 0;
			totalGasUsed = 0;

			readData(inFile, model, startingMileage);

			if(model == 'X')
			{
				break;
			}

			for(int x = 0; x < 50; x++)
			{
				outFile << endl;
			}

			printHeader(outFile);
			printHeading(outFile, model);
			continue;
		}

		inFile >> gallonsUsed;

		computeMileage(startingMileage, mileage, nextMileage, totalGasUsed, gallonsUsed, distanceDriven, mpg, totalMPG, totalDistance);
		printData(outFile, startingMileage, mileage, gallonsUsed, distanceDriven, mpg, totalGasUsed, totalDistance, totalMPG);
	}



	printFooter(outFile);

    outFile.close();
    inFile.close();
    return 0;
}

void printHeader(ofstream &outFile)
{
    //Receives the output file
    //Task - Prints the output file
    //Return - nothing

    outFile << setw(32) << "Tyler Knipfer";
    outFile << setw(17) << "CSC 24400";
    outFile << setw(15) << "Section 11" << endl;
    outFile << setw(30) << "Fall 2012";
    outFile << setw(20) << "Assignment #1" << endl;
    outFile << setw(35) << "---------------------------------------";
    outFile << setw(35) << "----------------------------------------\n\n";
    return;
}

void readData(ifstream &readFile, char &model, int &startingMileage)
{
	readFile >> model;
	readFile >> startingMileage;
}

void printData(ofstream &outFile, int &beginningMileage, int &endingMileage, float &gasUsed, int &distanceDriven, float &mpg, float &totalGasUsed, int &totalDistance, float &totalMPG)
{
	//First line of the information table
    outFile << left << setw(13) << beginningMileage << left << setw(13) << endingMileage << left << setw(13) << gasUsed;
    outFile << left << setw(13) << distanceDriven <<  left << setw(13) << fixed <<  setprecision(2) << mpg << left << setw(13) << totalGasUsed << left << setw(13) << totalDistance << left << setw(13) << totalMPG << endl;

}

void printHeading(ofstream &outFile, char &model)
{
    outFile << setw(50) << "TEST DATA" << endl;
    outFile << setw(50) << "Car ID - " << model;
    outFile << endl;
    outFile << setw(43) << "Tank Information";
    outFile << setw(30) << "Trip Information" << endl;

    //First line of the heading table
    outFile << left << setw(13) << "Beginning" << left << setw(13) << "Ending" << left << setw(13) << "Amount";
    outFile << left << setw(13) << "Leg" <<  left << setw(13) << "Miles";
    outFile << left << setw(13) << "Amount" << left << setw(13) << "Total" << left << setw(13) << "Miles" << endl;

    //Second line of the heading table
    outFile << left << setw(13) << "Odometer" << left << setw(13) << "Odometer" << left << setw(13) << "Of Gas";
    outFile << left << setw(13) << "Distance" <<  left << setw(13) << "per";
    outFile << left << setw(13) << "Of Gas" << left << setw(13) << "Distance" << left << setw(13) << "per" << endl;

    //Third line of the heading table
    outFile << left << setw(13) << "Reading" << left << setw(13) << "Odometer" << left << setw(13) << "Used";
    outFile << left << setw(13) << "Driven" <<  left << setw(13) << "Gallon";
    outFile << left << setw(13) << "Used" << left << setw(13) << "Driven" << left << setw(13) << "Gallon" << endl;

    outFile << "============================================================================================" << endl;
}

void computeMileage(int &beginningMileage, int &endingMileage, int &nextMileage, float &totalGasUsed, float &gasUsed, int &distanceDriven, float &mpg, float &totalMPG, int &totalDistance)
{
	distanceDriven = endingMileage - beginningMileage;


	totalDistance += distanceDriven;
	totalGasUsed += gasUsed;
	totalMPG = totalDistance / totalGasUsed;
	mpg = totalDistance / gasUsed;
}

void printFooter(ofstream &outFile)
{
    //Receives - the output file
    //Task - prints the program footer
    //Returns - nothing

    outFile << endl;
    outFile << setw(35) << "-----------------------------------------" << endl;
    outFile << setw(35) << "|       END OF PROGRAM OUTPUT            |" << endl;
    outFile << setw(35) << "-----------------------------------------" << endl;

    return;
}