using System;
using System.Collections.Generic;
using Xunit;
using Moq;
using FluentAssertions;
using SpotifyAPI.Web;

using System.Threading;
using System.Threading.Tasks;
using Xunit.Sdk;

namespace Selector.Tests
{
    public class PlaylistWatcherTests
    {
        public static IEnumerable<object[]> CurrentPlaylistData =>
        new List<object[]>
        {
            new object[] { new List<FullPlaylist>(){
                    Helper.FullPlaylist("playlist1"),
                    Helper.FullPlaylist("playlist1"),
                    Helper.FullPlaylist("playlist1"),
                    Helper.FullPlaylist("playlist1")
                }
            }
        };

        [Theory]
        [MemberData(nameof(CurrentPlaylistData))]
        public async void CurrentPlaylist(List<FullPlaylist> playing)
        {
            var playlistDequeue = new Queue<FullPlaylist>(playing);

            var spotMock = new Mock<ISpotifyClient>();

            spotMock.Setup(s => s.Playlists.Get(It.IsAny<string>()).Result).Returns(playlistDequeue.Dequeue);

            var config = new PlaylistWatcherConfig() { PlaylistId = "spotify:playlist:test" };
            var watcher = new PlaylistWatcher(config, spotMock.Object);

            for (var i = 0; i < playing.Count; i++)
            {
                await watcher.WatchOne();
                watcher.Live.Should().Be(playing[i]);
            }
        }

        public static IEnumerable<object[]> EventsData =>
        new List<object[]>
        {
            // NO CHANGING
            new object[] { new List<FullPlaylist>(){
                    Helper.FullPlaylist("Playlist", snapshotId: "snapshot1"),
                    Helper.FullPlaylist("Playlist", snapshotId: "snapshot1"),
                    Helper.FullPlaylist("Playlist", snapshotId: "snapshot1"),
                },
                // to raise
                new List<string>(){  },
                // to not raise
                new List<string>(){ "SnapshotChange" }
            },
            // CHANGING SNAPSHOT
            new object[] { new List<FullPlaylist>(){
                    Helper.FullPlaylist("Playlist", snapshotId: "snapshot1"),
                    Helper.FullPlaylist("Playlist", snapshotId: "snapshot2"),
                    Helper.FullPlaylist("Playlist", snapshotId: "snapshot2"),
                },
                // to raise
                new List<string>(){ "SnapshotChange" },
                // to not raise
                new List<string>(){  }
            }
        };

        [Theory]
        [MemberData(nameof(EventsData))]
        public async void Events(List<FullPlaylist> playing, List<string> toRaise, List<string> toNotRaise)
        {
            var playlistDequeue = new Queue<FullPlaylist>(playing);

            var spotMock = new Mock<ISpotifyClient>();

            spotMock.Setup(s => s.Playlists.Get(It.IsAny<string>()).Result).Returns(playlistDequeue.Dequeue);

            var config = new PlaylistWatcherConfig() { PlaylistId = "spotify:playlist:test" };
            var watcher = new PlaylistWatcher(config, spotMock.Object);

            using var monitoredWatcher = watcher.Monitor();

            for (var i = 0; i < playing.Count; i++)
            {
                await watcher.WatchOne();
            }

            toRaise.ForEach(r => monitoredWatcher.Should().Raise(r).WithSender(watcher));
            toNotRaise.ForEach(r => monitoredWatcher.Should().NotRaise(r));
        }
    }
}