First running version with all fields, sync, m3u generation and without old controller

Tv7Playlist.Core/PlaylistBuilder.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using Tv7Playlist.Data;
+
+namespace Tv7Playlist.Core
+{
+    public class PlaylistBuilder : IPlaylistBuilder
+    {
+        private readonly ILogger<PlaylistBuilder> _logger;
+        private readonly PlaylistContext _playlistContext;
+
+        public PlaylistBuilder(ILogger<PlaylistBuilder> logger, PlaylistContext playlistContext)
+        {
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+            _playlistContext = playlistContext ?? throw new ArgumentNullException(nameof(playlistContext));
+        }
+
+        public async Task<Stream> GeneratePlaylistAsync()
+        {
+            _logger.LogInformation(LoggingEvents.Playlist, "Building m3u file content");
+
+            var playlistEntries = await _playlistContext.PlaylistEntries.Where(e => e.IsAvailable).Where(e => e.IsEnabled)
+                .OrderBy(e => e.Position).AsNoTracking().ToListAsync();
+
+
+            return await CreatePlaylistStreamAsync(playlistEntries);
+        }
+
+        private static async Task<MemoryStream> CreatePlaylistStreamAsync(IEnumerable<PlaylistEntry> playlistEntries)
+        {
+            var outStream = new MemoryStream();
+            var outWriter = new StreamWriter(outStream);
+
+            await outWriter.WriteLineAsync(M3UConstants.ExtFileStartTag);
+
+            foreach (var entry in playlistEntries) await WriteEntryAsync(outWriter, entry);
+
+            outStream.Seek(0, SeekOrigin.Begin);
+            
+            return outStream;
+        }
+
+        private static async Task WriteEntryAsync(TextWriter outWriter, PlaylistEntry entry)
+        {
+            const int duration = -1;
+            var number = entry.TrackNumberOverride != 0 ? entry.TrackNumberOverride : entry.TrackNumber;
+            var extInfo = $"{M3UConstants.ExtInfStartTag}{duration},{number},{entry.Name}";
+            await outWriter.WriteLineAsync(extInfo);
+            await outWriter.WriteLineAsync(entry.Url);
+        }
+    }
+}