// CSE143 Sp01 Homework 2 Sample Solution
// hw2sol.cpp - main program
// HP  4/01

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

#include "placelist.h"
#include "location.h"

// symbolic constants
const string EOF_MARKER  = ".";		// place name that marks end of data file
const string QUIT_MARKER = ".";		// input value entered by user to stop program


// Get file name from user and read place data from that file, storing
// it in places.  Return true if successful, otherwise return false.
bool readPlaceList(PlaceList &places) {
	string fileName;		// data file name
	double	x, y;			// current location and place name from file
	string	name;

	// Get file name from user
	cout << "Enter file name: ";
	cin  >> fileName;

	// Attempt to open file; quit if unsuccessful
	ifstream data(fileName.c_str());
	if (!data) {
		return false;
	}

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


// If name is found in places, return true; otherwise print
// a suitable message and return false.
bool checkPlace(PlaceList &places, string name) {
	if (places.contains(name)) {
		return true;
	} else {
		cout << "Never heard of " << name << endl;
		return false;
	}
}


// Read pairs of place names and report distance and direction from
// first name of each pair to the second
void answerQueries(PlaceList &places) {
	string	origin;			// first name of a pair
	string	destination;	// second name of a pair
	bool	origFound;		// = "origin found in places"
	bool	destFound;		// = "destination found in places"
	Location origLoc;		// Locations of origin and destination
	Location destLoc;
	double	distance;		// distance from origin to destination

	for(;;) {
		// read origin and quit if it is the "." marker
		cout << "\nEnter start location: ";
		cin  >> origin;
		if (origin == QUIT_MARKER) {
			cout << "Bye" << endl;
			return;
		}

		// read destination
		cout << "Enter destination: ";
		cin  >> destination;

		// check whether origin and destination are in places,
		// and print a suitable message if they are not there
		origFound = checkPlace(places, origin);
		destFound = checkPlace(places, destination);

		// if both places are known, report distance and direction
		// from origin to destination
		if (origFound && destFound) {
			origLoc = places.locationOf(origin);
			destLoc = places.locationOf(destination);

			distance = origLoc.distanceTo(destLoc);
			if (distance == 0.0) {
				cout << "Distance from " << origin << " to " << destination
					<< " is " << distance << " miles" << endl;
			} else {
				cout << destination << " is " << distance << " miles "
					<< origLoc.directionTo(destLoc) << " of " << origin << endl;
			}
		}
	}

}


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

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

	answerQueries(places);
	return 0;
}