/*
	arrayOfStructsContainingArrays.cpp

	Demonstrate the use of arrays that hold
	struct objects that hold arrays

	John Sterling
	CS1124
	Polytechnic University
*/


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

const int BREED_MAX = 20;		// Maximum number of breeds that can be stored for a Dog.
								// This should be a static const int inside the Dog struct, 
								// but we haven't covered that.

struct Dog {
	string name;				// The name of the dog
	string breed[BREED_MAX];	// A dog may be a combination of several breeds
	int countOfBreeds;			// How many breeds for this dog?
	int age;					// Age of the dog.  (Probably better to use date of birth).

};
void displayDog(const Dog&);

int fillKennel(ifstream&, Dog[], int);

int main() {
	const int KENNEL_SIZE = 10;
	Dog kennel[KENNEL_SIZE];
	//ifstream ifs("dogs.txt");
	ifstream ifs;
	ifs.open("dogs.txt");
	if (!ifs) {		// equivalent to:  if (ifs.fail()) {
		cerr << "Idiot!  I can't open the file!\n";
		exit(17);
	}

	int count = fillKennel(ifs, kennel, KENNEL_SIZE);

	cout << "Total number of dogs read in: " << count << endl;

	// Display the dogs that were read in
	for (int i = 0; i < count; ++i) displayDog(kennel[i]);
}

// fillKennel is passed a stream to read descriptions of dogs from,
//                      an array of dogs to fill
//                      the size of the array
// It returns the number of dogs that have been read into the array.
// At most sizeOfDogs number of Dogs will be read from the stream. 
// Returns the number of Dogs placed in the array.
// Each line of the file describes a single dog.
// Each line consists of:
//     name age breed1 breed2 ...
int fillKennel(ifstream& dogStream, Dog myDogs[], int sizeOfDogs) {
	int dogIndex = 0;
	// Fill the array.
	// Use the && operator's "short circuiting" 
	// to prevent more than sizeOfDogs number of Dogs to be read
	while (dogIndex < sizeOfDogs && dogStream >> myDogs[dogIndex].name) {
		dogStream >> myDogs[dogIndex].age;

		string breeds;
		getline(dogStream, breeds);	// Get the remainder of the line containing thebreeds

		istringstream iss(breeds);	// Set up a stream to read the breeds from
		int breedIndex(0);			// Index for filling the breeds array
		// Fill the Dog's array of breeds.  At most BREED_MAX breeds from the line
		// will be used.  Any more than that will be ignored.
		while( breedIndex < BREED_MAX && iss >> myDogs[dogIndex].breed[breedIndex] ) {
			++breedIndex;
		}
		myDogs[dogIndex].countOfBreeds = breedIndex;
		++dogIndex;
	}
	return dogIndex;
}

// Display a dog
void displayDog(const Dog& d) {
	cout << "Name: " << d.name 
		<< "; Age: " << d.age
		<< "; Breeds: ";
	// Display all but the last breed followed by ", ".
	for (int i = 0; i < d.countOfBreeds-1; ++i)	cout << d.breed[i] << ", ";
	// Display the last breed followed by a newline.
	if (d.countOfBreeds > 0) cout << d.breed[d.countOfBreeds-1] << endl;
}