using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.IO;
using Sony.Core.Data;
using MusicMatch.Core.Data;

namespace ScheduledTask
{
    public static class libspotifyPlaylistLib
    {
        public static List<SpotifyLink> GetPublicPlaylists(IEnumerable<string> spotifyUsers)
        {
            List<SpotifyLink> playlists = new List<SpotifyLink>();

            var allUsers = spotifyUsers.Distinct().ToList();
            // Fetch result for 10 users at a time
            const int groupCount = 10;
            for (int i = 0; i <= allUsers.Count / 10; i++)
            {
                var groupedUsers = allUsers.Skip(i*groupCount).Take(groupCount).ToList();
                Console.WriteLine("libspotifyPlaylistLib with following users:" + string.Join(",", groupedUsers));
                playlists.AddRange(LibSpotifyGetPublicPlaylists(string.Join(" ", groupedUsers)));
            }

            return playlists;
        }

        private static List<SpotifyLink> LibSpotifyGetPublicPlaylists(string args)
        {
            List<SpotifyLink> playlistLinks = new List<SpotifyLink>();
            try
            {
                var processInfo = new ProcessStartInfo("libspotifyPlaylistLib/libspotifyPlaylistLib.exe", args);
                processInfo.RedirectStandardOutput = true;
                processInfo.UseShellExecute = false;
                var process = Process.Start(processInfo);
                string temp = process.StandardOutput.ReadToEnd();
                var rows = temp.Split(new[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
                foreach (var row in rows)
                {
                    var values = row.Split(';');
                    if (values.Count() < 2)
                        continue;

                    var playlistSpotifyUser = values[0];
                    string linkUri = values[1];

                    SpotifyLink link = new SpotifyLink(linkUri);

                    if (!playlistSpotifyUser.Equals(link.ExtractSpotifyUserName(), StringComparison.InvariantCultureIgnoreCase))
                        continue; //we are only interested in playlists created by that user.

                    playlistLinks.Add(link);
                }

                process.Close();

                return playlistLinks;
            }
            catch (Exception)
            {
            }
            return playlistLinks;
        }
    }
}