// CSE143 Sp01 Homework 1 Sample Solution
// hw1sol.cpp - main program
// HP  4/01

#include <iostream>
#include <fstream>
#include <string>
#include <cmath>
using namespace std;

#include "placelist.h"


// Read place data from "places.txt" and store in places
// Returns true if successful; otherwise returns false
bool readPlaceList(PlaceList &places) {
	double	x, y;					// current location and place name from file
	string	name;

	// Attempt to open file; quit if unsuccessful
	ifstream data("places.txt");
	if (!data) {
		return false;
	}

	// read data from file
	data >> x >> y >> name;
	while (name != ".") {
		addPlace(places, x, y, name);
		data >> x >> y >> name;
	}
	return true;
}


// = distance from (0,0) to (x,y)
double distance(double x, double y) {
	return sqrt(x*x + y*y);
}


// Read place names and report distance from the center of the universe
void answerQueries(PlaceList &places) {
	string	name;			// place name entered by user
	bool	found;			// = "place name was found in places"
	double	x, y;			// location of place, if found
	double	dist;			// distance between (0,0) and (x,y)

	cout << "Please enter place names or a period to stop" << endl;
	cin >> name;
	while (name != ".") {
		// report results for current name
		findCoordinates(places, name, x, y, found);
		if (!found) {
			cout << "Never heard of " << name << endl;
		} else {
			dist = distance(x,y);
			if (dist == 0.0) {
				cout << name << " is the Center of the Universe" << endl;
			} else {
				cout << name << " is " << dist << " miles from the Center of the Universe" << endl;
			}
		}

		// read next name
		cin >> name;
	}
	cout << "Bye" << endl;
}


// main program
int main() {
	PlaceList	places;		// list of place names and locations
	bool		success;	// = "input file read successfully"

	makePlaceListEmpty(places);

	success = readPlaceList(places);
	if (!success) {
		cout << "Unable to read input file" << endl;
		return 1;
	}

	answerQueries(places);
	return 0;
}