#include <iostream>
#include <iomanip>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
#include <algorithm>
using namespace std;

vector<double> splitLine(string line); // Splits each line from the file into a vector containing each number in the line.
void calcStats(vector<double>& data, vector<double>& totals); // Calculates the extra statistics (total fare and cost per mile) and then appends them to the vector. Also adds to the total number of passengers, total number of fares, and total number distance (for calculating averages later.
void printTableLine(vector<double>& line, int cWidth); // Prints each line of the table;

const int COLUMN_WIDTH = 10;
const int TOTALS_WIDTH = 30;
const int DEC_PRECISION = 3;
const vector<string> COLUMN_HEADERS = { "# ppl", "Dist.", "Fare", "Toll", "Total", "Fare/mi" };

// I was already tallying up several totals that could be used in a lot of ways, so I added a little (ok, a lot) more final data to print out.
const vector<string> FINAL_DATA_NAMES = {
	"Total Trips Made: ",
	"Trips With Tolls: ",
	"Toll Percentage: ",
	"Total Passengers Carried: ",
	"Total Fares Paid: ",
	"Total Distance Traveled: ",
	"Average Distance Per Trip: ",
	"Average Fare Per Trip: ",
	"Average Fare Per Person: ",
	"Average Fare Per Mile: ",
};

int main()
{
	string filepath = "";
	ifstream file;
	vector<vector<double> > data = {}; // Holds each line of data
	vector<double> totals = { 0, 0, 0, 0, 0 }; // total entries, total passengers, total paid, total distance, # with tolls

	cout << "Please enter the full path to your data file. If you don't know the path, you can find it by locating the file in File Explorer (assuming you're using Windows), right-clicking on it, and selecting \"Properties\". The location is about halfway down the Window and will probably start with \"C:\\Users\\\". Copy it into here, then add another backslash(\"\\\"), and then the name of the file and its extension (probably .txt)." << endl << endl;;
	while (true)
	{
		cout << "Path to file: ";
		cin >> filepath;

		file.open(filepath);

		if (file.fail())
		{
			cout << "Oh no! Something went wrong. Please try again." << endl;
		}
		else
		{
			break;
		}
	}

	string line;
	while (getline(file, line))
	{
		data.push_back(splitLine(line));
	}
	file.close();

	cout << right;
	for (string s : COLUMN_HEADERS)
	{
		cout << setw(COLUMN_WIDTH) << s << " ";
	}
	cout << endl;
	for (vector<double> dataLine : data)
	{
		calcStats(dataLine, totals);
		totals[0]++;
		vector<double> lineSlice(dataLine.begin() + 2, dataLine.end());
		printTableLine(lineSlice, COLUMN_WIDTH);
	}
	cout << endl;

	vector<double> finalData = {
		totals[0], // Total Trips Made
		totals[4], // Trips With Tolls
		(totals[4] / totals[0]) * 100, // Toll Percentage
		totals[1], // Total Passengers Carried
		totals[2], // Total Fares Paid
		totals[3], // Total Distance Traveled
		(totals[3] / totals[0]), // Average Distance Per Trip
		(totals[2] / totals[0]), // Average Fare Per Trip
		(totals[2] / totals[1]), // Average Fare Per Person
		(totals[2] / totals[3]), // Average Far Per Mile
	};

	for (int i = 0; i < size(FINAL_DATA_NAMES); i++)
	{
		cout << right << setw(TOTALS_WIDTH) << FINAL_DATA_NAMES[i] << left;

		if (i == 4 ||
			i == 7 ||
			i == 8 ||
			i == 9)
		{
			cout << "$";
		}

		cout << fixed << setprecision(DEC_PRECISION) << finalData[i];

		if (i == 5 ||
			i == 6)
		{
			cout << "mi";
		}

		if (i == 2) { cout << "%"; }

		cout << endl;
	}
}

vector<double> splitLine(string line)
{
	stringstream stream(line);
	double num;
	vector<double> data = {};
	while (stream >> num)
	{
		data.push_back(num);
	}
	return data;
}

void calcStats(vector<double>& data, vector<double>& totals)
{
	data.push_back(data[4] + data[5]);
	data[3] == 0 ? data.push_back(0) : data.push_back(data[6] / data[3]);
	totals[1] += data[2];
	totals[2] += data[6];
	totals[3] += data[3];
	if (data[5] > 0) { totals[4]++; }
}

void printTableLine(vector<double>& line, int cWidth)
{
	cout << right;
	for (double n : line)
	{
		cout << fixed << setw(cWidth) << setprecision(DEC_PRECISION) << n << " ";
	}
	cout << endl;
}