#include <string>
#include <iostream>
#include <vector>
#include "song.h"
using namespace std;


// show all songs in a vector of songs
void ShowSongs (const vector<Song> & all) {
	int num = all.size();
	for (int cnt = 0; cnt < num; cnt++) {
		cout << all[cnt] << endl;
	}
	return;
}


// ask yes no question - not allowing to continue until y/Y/n/N entered
// returns a lower case y or n (always! nothing else)
char askYN (const string & prompt) {
	char answ;
	//    (loop until they give us a valid answer to the question)
	do {		   
		// ask for and get answer
		cout << prompt << " (y or n): " << flush;
		cin >> answ;		   
		// force all to lower case to simplify while test below		   
		if (answ == 'Y')			   
			answ = 'y';		   
		if (answ == 'N')			   
			answ = 'n';	   
	}	   
	while ((answ != 'n') && (answ != 'y'));
	return answ;
}

// MAR
istream& mygetline(istream &strIn, string &newVal, char toStop = '\n') {
	char curr;
	newVal = "";
	curr = getchar();
	// skip leading "white space" - new line blank
	while ((curr == ' ') || (curr == '\n')) {
		curr = getchar();
	}
	// now get real chars
	while (curr != toStop) {
		newVal += curr;
		curr = getchar();
	}
	return strIn;
}



int main() {
	char cont;
	Song unknown;
	cout << unknown << endl;
	Song leaving("Leaving Las Vegas","Sheryl Crow",3,39);
	cout << leaving << endl;

	vector<Song> songs; // empty
	cout << " initial song list: " << endl;
	ShowSongs(songs);
	cout << endl << "size: " << songs.size() << endl
		<< "Capacity: " << songs.capacity() << endl;

	do {
		string newTitle;
		string newArtist;
		int newMins;
		int newSecs;

		cout << "Enter the song title: " << flush;
		mygetline(cin,newTitle,'\n');

		cout << "Enter the artist: " << flush;
		mygetline(cin,newArtist,'\n');

		cout << "Enter the song time in whole minutes " << flush;
		cin >> newMins;
		cout << "Now enter seconds " << flush;
		cin >> newSecs;

		Song newSong(newTitle,newArtist,newMins,newSecs);
		songs.push_back(newSong);

		cout << endl << "Current Songs: " << endl;
		ShowSongs(songs);

		cont = askYN("Do you want to continue adding songs?");
	}
	while (cont == 'y');

	// other things
	cout << endl << "size: " << songs.size() << endl
		<< "Capacity: " << songs.capacity() << endl;

	cout << "Front: " << songs.front() << endl;
	cout << "Back: " << songs.back() << endl;
	
	songs.pop_back();
	ShowSongs(songs);
	cout << endl << "size: " << songs.size() << endl
		<< "Capacity: " << songs.capacity() << endl;

	askYN("wait");

	vector<Song> junk(4,unknown);
	cout << " junk: " << endl;
	ShowSongs(junk);


	vector<Song> newjunk(4); // same as explicitly using result of default constructor
	cout << " newjunk: " << endl;
	ShowSongs(newjunk);

	newjunk.pop_back();
	cout << endl << "size: " << newjunk.size() << endl
		<< "Capacity: " << newjunk.capacity() << endl;

	vector<Song> cp(songs);
	cout << "copy: " << endl;
	ShowSongs(cp);
	cout << endl << "size: " << cp.size() << endl
		<< "Capacity: " << cp.capacity() << endl;

	return 0;
}