using System;
using System.Collections.Generic;
using Emby.Server.Implementations.Library;
using Jellyfin.Database.Implementations;
using Jellyfin.Database.Implementations.Entities;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Model.Configuration;
using Microsoft.EntityFrameworkCore;
using Moq;
using Xunit;
using AudioBook = MediaBrowser.Controller.Entities.AudioBook;

namespace Jellyfin.Server.Implementations.Tests.Library;

public class UserDataManagerTests
{
    private readonly UserDataManager _userDataManager;
    private readonly User _user;

    public UserDataManagerTests()
    {
        var config = new Mock<IServerConfigurationManager>();
        config.SetupGet(c => c.Configuration).Returns(new ServerConfiguration());

        var repository = Mock.Of<IDbContextFactory<JellyfinDbContext>>();

        _userDataManager = new UserDataManager(config.Object, repository);
        _user = new User("user", "auth-provider", "reset-provider")
        {
            Id = Guid.NewGuid()
        };
    }

    private AudioBook CreateAudioBook()
    {
        // GetUserDataKeys(): ["Author-Series-0001Book Title", "<item id N>"]
        return new AudioBook
        {
            Id = Guid.NewGuid(),
            Name = "Book Title",
            Album = "Series",
            AlbumArtists = new[] { "Author" },
            IndexNumber = 1
        };
    }

    private UserData CreateUserDataRow(AudioBook item, string key, long positionTicks)
    {
        return new UserData
        {
            ItemId = item.Id,
            Item = null,
            UserId = _user.Id,
            User = null,
            CustomDataKey = key,
            PlaybackPositionTicks = positionTicks
        };
    }

    [Fact]
    public void GetUserData_RowsUnderCurrentAndRetiredKeys_PrefersCurrentKeyRow()
    {
        var item = CreateAudioBook();
        var currentKey = item.GetUserDataKeys()[0];

        // the retired-key row comes first to ensure selection is by key, not row order
        item.UserData = new List<UserData>
        {
            CreateUserDataRow(item, "Author-Old Album-0001Old File Name", 111),
            CreateUserDataRow(item, currentKey, 222)
        };

        var userData = _userDataManager.GetUserData(_user, item);

        Assert.NotNull(userData);
        Assert.Equal(currentKey, userData.Key);
        Assert.Equal(222, userData.PlaybackPositionTicks);
    }

    [Fact]
    public void GetUserData_NoPrimaryKeyRow_UsesNextCurrentKeyRow()
    {
        var item = CreateAudioBook();
        var idKey = item.GetUserDataKeys()[1];

        item.UserData = new List<UserData>
        {
            CreateUserDataRow(item, "Author-Old Album-0001Old File Name", 111),
            CreateUserDataRow(item, idKey, 333)
        };

        var userData = _userDataManager.GetUserData(_user, item);

        Assert.NotNull(userData);
        Assert.Equal(idKey, userData.Key);
        Assert.Equal(333, userData.PlaybackPositionTicks);
    }

    [Fact]
    public void GetUserData_OnlyRetiredKeyRows_ReturnsRetiredKeyRow()
    {
        var item = CreateAudioBook();

        item.UserData = new List<UserData>
        {
            CreateUserDataRow(item, "Author-Old Album-0001Old File Name", 111)
        };

        var userData = _userDataManager.GetUserData(_user, item);

        Assert.NotNull(userData);
        Assert.Equal(111, userData.PlaybackPositionTicks);
    }

    [Fact]
    public void GetUserData_NoRows_ReturnsDefaultWithPrimaryKey()
    {
        var item = CreateAudioBook();
        item.UserData = new List<UserData>();

        var userData = _userDataManager.GetUserData(_user, item);

        Assert.NotNull(userData);
        Assert.Equal(item.GetUserDataKeys()[0], userData.Key);
        Assert.Equal(0, userData.PlaybackPositionTicks);
    }

    [Fact]
    public void GetUserData_RowsForOtherUsers_AreIgnored()
    {
        var item = CreateAudioBook();
        var currentKey = item.GetUserDataKeys()[0];

        var otherUserRow = CreateUserDataRow(item, currentKey, 999);
        otherUserRow.UserId = Guid.NewGuid();

        item.UserData = new List<UserData>
        {
            otherUserRow,
            CreateUserDataRow(item, currentKey, 222)
        };

        var userData = _userDataManager.GetUserData(_user, item);

        Assert.NotNull(userData);
        Assert.Equal(222, userData.PlaybackPositionTicks);
    }
}