#include <iostream>
#include "computer.h"

// Add an MP3 to the list of MP3s.  Return false if the song is already there. 
bool Computer::add_mp3(const string& artist, const string& title) {
  list<MP3>::iterator p;
  for (p = mp3s_.begin(); p != mp3s_.end(); ++p) {
    if (p->get_artist() == artist && p->get_title() == title) break;
  }
  if (p != mp3s_.end()) {
    return false;
  } else {
    mp3s_.push_back(MP3(artist, title));
    return true;
  }  
}

// Iterate through the list of MP3, printing each.
void Computer::print_mp3s() const {
  for(list<MP3>::const_iterator p = mp3s_.begin(); p != mp3s_.end(); ++p) {
    cout << "  ARTIST: " << p->get_artist() << endl
         << "  TITLE: " << p->get_title() << endl;
  }
}

// Returns true if the Computer has the requested song, returns reference to song via parameter
bool Computer::has_song(const string& artist, const string& title, MP3& requested_song) const {
  for (list<MP3>::const_iterator p = mp3s_.begin(); p != mp3s_.end(); ++p) {
    if (p->get_artist() == artist && p->get_title() == title) {
      requested_song = *p;
      return true;
    }
  }
  return false;
}

// Build a list of all songs by the indicated artist.
list<MP3> Computer::songs_by_artist(const string& artist) const {
  list<MP3> results;
  for(list<MP3>::const_iterator p = mp3s_.begin(); p != mp3s_.end(); ++p) {
    if (p->get_artist() == artist) results.push_back(*p);
  }
  return results;
}