using System.Collections.Generic;
using System.Data.Common;
using System.IO.Abstractions.TestingHelpers;
using System.Linq;
using System.Threading.Tasks;
using API.Data;
using API.Entities;
using API.Entities.Enums;
using API.Extensions;
using API.Services;
using API.Services.Tasks;
using API.SignalR;
using AutoMapper;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Data.Sqlite;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using NSubstitute;
using Xunit;

namespace API.Tests.Services;

public class BackupServiceTests
{
    private readonly ILogger<BackupService> _logger = Substitute.For<ILogger<BackupService>>();
    private readonly IUnitOfWork _unitOfWork;
    private readonly IHubContext<MessageHub> _messageHub = Substitute.For<IHubContext<MessageHub>>();
    private readonly IConfiguration _config;

    private readonly DbConnection _connection;
    private readonly DataContext _context;

    private const string CacheDirectory = "C:/kavita/config/cache/";
    private const string CoverImageDirectory = "C:/kavita/config/covers/";
    private const string BackupDirectory = "C:/kavita/config/backups/";
    private const string LogDirectory = "C:/kavita/config/logs/";

    public BackupServiceTests()
    {
        var contextOptions = new DbContextOptionsBuilder()
            .UseSqlite(CreateInMemoryDatabase())
            .Options;
        _connection = RelationalOptionsExtension.Extract(contextOptions).Connection;

        _context = new DataContext(contextOptions);
        Task.Run(SeedDb).GetAwaiter().GetResult();

        _unitOfWork = new UnitOfWork(_context, Substitute.For<IMapper>(), null);
        _config = Substitute.For<IConfiguration>();

    }

    #region Setup

    private static DbConnection CreateInMemoryDatabase()
    {
        var connection = new SqliteConnection("Filename=:memory:");

        connection.Open();

        return connection;
    }

    public void Dispose() => _connection.Dispose();

    private async Task<bool> SeedDb()
    {
        await _context.Database.MigrateAsync();
        var filesystem = CreateFileSystem();

        await Seed.SeedSettings(_context, new DirectoryService(Substitute.For<ILogger<DirectoryService>>(), filesystem));

        var setting = await _context.ServerSetting.Where(s => s.Key == ServerSettingKey.CacheDirectory).SingleAsync();
        setting.Value = CacheDirectory;

        setting = await _context.ServerSetting.Where(s => s.Key == ServerSettingKey.BackupDirectory).SingleAsync();
        setting.Value = BackupDirectory;

        _context.ServerSetting.Update(setting);

        _context.Library.Add(new Library()
        {
            Name = "Manga",
            Folders = new List<FolderPath>()
            {
                new FolderPath()
                {
                    Path = "C:/data/"
                }
            }
        });
        return await _context.SaveChangesAsync() > 0;
    }

    private async Task ResetDB()
    {
        _context.Series.RemoveRange(_context.Series.ToList());

        await _context.SaveChangesAsync();
    }

    private static MockFileSystem CreateFileSystem()
    {
        var fileSystem = new MockFileSystem();
        fileSystem.Directory.SetCurrentDirectory("C:/kavita/");
        fileSystem.AddDirectory("C:/kavita/config/");
        fileSystem.AddDirectory(CacheDirectory);
        fileSystem.AddDirectory(CoverImageDirectory);
        fileSystem.AddDirectory(BackupDirectory);
        fileSystem.AddDirectory(LogDirectory);
        fileSystem.AddDirectory("C:/data/");

        return fileSystem;
    }

    #endregion



    #region GetLogFiles

    public void GetLogFiles_ExpectAllFiles_NoRollingFiles()
    {
        var filesystem = CreateFileSystem();
        filesystem.AddFile($"{LogDirectory}kavita.log", new MockFileData(""));
        filesystem.AddFile($"{LogDirectory}kavita1.log", new MockFileData(""));

        var ds = new DirectoryService(Substitute.For<ILogger<DirectoryService>>(), filesystem);
        // You can't mock _config extensions because they are static
        _config.GetMaxRollingFiles().Returns(1);
        _config.GetLoggingFileName().Returns(ds.FileSystem.Path.Join(LogDirectory, "kavita.log"));

        var backupService = new BackupService(_logger, _unitOfWork, ds, _config, _messageHub);

        Assert.Single(backupService.GetLogFiles(1, LogDirectory));
    }


    #endregion

}