#include <iostream>
#include <string>
#include <cstring>
#include <vector>
#include <fstream>

using namespace std;

int main(int argc, char** argv)
{
	ifstream file;
	string curr_id;
	int pos;
	vector<string> ids_array;

	if(argc < 2)
	{
		cout << "Usage: " << argv[0] << " [playlist]" << endl;
		return -1;
	}

	file.open(argv[1]);
	if(!file.is_open())
	{
		cout << "Unable to open file" << endl;
		return -1;
	}

	while(!file.eof())
	{
		getline(file, curr_id);

		for (pos = 0; pos < curr_id.length(); ++pos)
		{
			if (0 != isspace(curr_id[pos]))
			{
				curr_id.erase(pos, 1);
				--pos;
			}
		}

		// Delete everything after comment
		pos = curr_id.find("/*");
		if (string::npos != pos)
		{
			curr_id.erase(pos);
		}

		// Find beginning of parameters
		pos = curr_id.find("?");
		if (string::npos == pos)
		{
			continue;
		}
		curr_id.erase(0, pos + 1);

		// Find beginning of video id
		pos = curr_id.find("v=");
		if (string::npos == pos)
		{
			continue;
		}
		curr_id.erase(0, pos + 2);

		// Delete everything after the id if exists
		pos = curr_id.find("&");
		if (string::npos != pos)
		{
			curr_id.erase(pos);
		}

		// Put it in array
		if (!curr_id.empty())
		{
			ids_array.push_back(curr_id);
		}
	}

	if(0 != ids_array.size())
	{
		cout << "http://www.youtube.com/watch_videos?video_ids=";
		cout << ids_array[0];
		for(vector<string>::iterator it = ids_array.begin() + 1; it != ids_array.end(); ++it)
		{
			cout << "," << *it;
		}
		cout << endl;
	}
	else
	{
		cout << "No video links found. 'youtu.be' links are not supported" << endl;
	}
	return 0;
}