using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using FluentAssertions;
using Moq;
using NUnit.Framework;
using NzbDrone.Common.Disk;
using NzbDrone.Core.Configuration;
using NzbDrone.Core.DiskSpace;
using NzbDrone.Core.Test.Framework;
using NzbDrone.Core.Tv;
using NzbDrone.Test.Common;

namespace NzbDrone.Core.Test.DiskSpace
{
    [TestFixture]
    public class DiskSpaceServiceFixture : CoreTest<DiskSpaceService>
    {
        private string _seriesFolder;
        private string _seriesFolder2;
        private string _droneFactoryFolder;

        [SetUp]
        public void SetUp()
        {
            _seriesFolder = @"G:\fasdlfsdf\series".AsOsAgnostic();
            _seriesFolder2 = @"G:\fasdlfsdf\series2".AsOsAgnostic();
            _droneFactoryFolder = @"G:\dronefactory".AsOsAgnostic();

            Mocker.GetMock<IDiskProvider>()
                  .Setup(v => v.GetMounts())
                  .Returns(new List<IMount>());

            Mocker.GetMock<IDiskProvider>()
                  .Setup(v => v.GetPathRoot(It.IsAny<string>()))
                  .Returns(@"G:\".AsOsAgnostic());

            Mocker.GetMock<IDiskProvider>()
                  .Setup(v => v.GetAvailableSpace(It.IsAny<string>()))
                  .Returns(0);

            Mocker.GetMock<IDiskProvider>()
                  .Setup(v => v.GetTotalSize(It.IsAny<string>()))
                  .Returns(0);

            GivenSeries();
        }

        private void GivenSeries(params Series[] series)
        {
            Mocker.GetMock<ISeriesService>()
                  .Setup(v => v.GetAllSeries())
                  .Returns(series.ToList());
        }

        private void GivenExistingFolder(string folder)
        {
            Mocker.GetMock<IDiskProvider>()
                  .Setup(v => v.FolderExists(folder))
                  .Returns(true);
        }

        [Test]
        public void should_check_diskspace_for_series_folders()
        {
            GivenSeries(new Series { Path = _seriesFolder });

            GivenExistingFolder(_seriesFolder);

            var freeSpace = Subject.GetFreeSpace();

            freeSpace.Should().NotBeEmpty();
        }

        [Test]
        public void should_check_diskspace_for_same_root_folder_only_once()
        {
            GivenSeries(new Series { Path = _seriesFolder }, new Series { Path = _seriesFolder2 });

            GivenExistingFolder(_seriesFolder);
            GivenExistingFolder(_seriesFolder2);

            var freeSpace = Subject.GetFreeSpace();

            freeSpace.Should().HaveCount(1);

            Mocker.GetMock<IDiskProvider>()
                  .Verify(v => v.GetAvailableSpace(It.IsAny<string>()), Times.Once());
        }

        [Test]
        public void should_not_check_diskspace_for_missing_series_folders()
        {
            GivenSeries(new Series { Path = _seriesFolder });

            var freeSpace = Subject.GetFreeSpace();

            freeSpace.Should().BeEmpty();

            Mocker.GetMock<IDiskProvider>()
                  .Verify(v => v.GetAvailableSpace(It.IsAny<string>()), Times.Never());
        }

        [Test]
        public void should_check_diskspace_for_dronefactory_folder()
        {
            Mocker.GetMock<IConfigService>()
                  .SetupGet(v => v.DownloadedEpisodesFolder)
                  .Returns(_droneFactoryFolder);

            GivenExistingFolder(_droneFactoryFolder);

            var freeSpace = Subject.GetFreeSpace();

            freeSpace.Should().NotBeEmpty();
        }

        [Test]
        public void should_not_check_diskspace_for_missing_dronefactory_folder()
        {
            Mocker.GetMock<IConfigService>()
                  .SetupGet(v => v.DownloadedEpisodesFolder)
                  .Returns(_droneFactoryFolder);

            var freeSpace = Subject.GetFreeSpace();

            freeSpace.Should().BeEmpty();

            Mocker.GetMock<IDiskProvider>()
                  .Verify(v => v.GetAvailableSpace(It.IsAny<string>()), Times.Never());
        }

        [TestCase("/boot")]
        [TestCase("/var/lib/rancher")]
        [TestCase("/var/lib/rancher/volumes")]
        [TestCase("/var/lib/kubelet")]
        [TestCase("/var/lib/docker")]
        [TestCase("/some/place/docker/aufs")]
        public void should_not_check_diskspace_for_irrelevant_mounts(string path)
        {
            var mount = new Mock<IMount>();
            mount.SetupGet(v => v.RootDirectory).Returns(path);
            mount.SetupGet(v => v.DriveType).Returns(System.IO.DriveType.Fixed);

            Mocker.GetMock<IDiskProvider>()
                  .Setup(v => v.GetMounts())
                  .Returns(new List<IMount> { mount.Object });

            var freeSpace = Subject.GetFreeSpace();

            freeSpace.Should().BeEmpty();
        }
    }
}