using Explorer.Domain;
using Explorer.Domain.Abstractions;

namespace Explorer.Domain.Tests;

public class NameNormalizerTests
{
    [Fact]
    public void Normalize_folds_case_and_keeps_unicode()
    {
        Assert.Equal("straße", NameNormalizer.Normalize("Straße"));
        Assert.Equal("abc", NameNormalizer.Normalize("ABC"));
    }

    [Fact]
    public void Extension_skips_leading_dot_names()
    {
        Assert.Equal("mkv", NameNormalizer.Extension("film.mkv"));
        Assert.Null(NameNormalizer.Extension(".gitignore"));
        Assert.Null(NameNormalizer.Extension("Makefile"));
    }
}

public class PathRulesTests
{
    [Fact]
    public void Extended_roundtrip_local_and_unc()
    {
        Assert.Equal(@"\\?\C:\Temp", PathRules.ToExtended(@"C:\Temp"));
        Assert.Equal(@"\\?\UNC\server\share", PathRules.ToExtended(@"\\server\share"));
        Assert.Equal(@"C:\Temp", PathRules.FromExtended(@"\\?\C:\Temp"));
        Assert.Equal(@"\\server\share", PathRules.FromExtended(@"\\?\UNC\server\share"));
    }

    [Fact]
    public void Canonical_unc_lowercases_server()
    {
        Assert.Equal(@"\\media\Movies", PathRules.CanonicalUncRoot(@"\\Media\Movies\Action"));
    }

    [Fact]
    public void Relative_and_parent()
    {
        Assert.Equal(@"Windows\System32", PathRules.MakeRelative(@"C:\", @"C:\Windows\System32"));
        Assert.Equal(@"C:\Windows", PathRules.Parent(@"C:\Windows\System32"));
        Assert.Equal(@"C:\", PathRules.Parent(@"C:\Windows"));
        Assert.True(PathRules.DriveLetterSortKey(@"D:\") < PathRules.DriveLetterSortKey(@"F:\"));
        Assert.True(PathRules.DriveLetterSortKey(@"C:\") < PathRules.DriveLetterSortKey(@"\\media\movies"));
        Assert.Equal(@"pack.zip\docs", PathRules.RelativeParent(@"pack.zip\docs\a.txt"));
        Assert.Equal("pack.zip", PathRules.RelativeParent(@"pack.zip\docs"));
        Assert.Equal("", PathRules.RelativeParent("pack.zip"));
    }

    [Fact]
    public void Join_display_combines_root_and_relative()
    {
        Assert.Equal(@"C:\Users\Docs", PathRules.JoinDisplay(@"C:\Users", "Docs"));
        Assert.Equal(@"C:\", PathRules.JoinDisplay(@"C:\", ""));
        Assert.Equal("Docs", PathRules.JoinDisplay(null, "Docs"));
    }

    [Fact]
    public void Shorten_keeps_root_and_leaf()
    {
        Assert.Equal(@"C:\Temp", PathRules.ShortenDisplay(@"C:\Temp"));
        Assert.Equal(@"C:\Users\…\Documents\Budget", PathRules.ShortenDisplay(@"C:\Users\Dominique\Documents\Budget", 28));
        Assert.Equal(@"\\media\movies\…\Action\Dune", PathRules.ShortenDisplay(@"\\media\movies\New\Action\Dune", 28));
    }
}

public class WindowsFileNamesTests
{
    [Fact]
    public void Rejects_reserved_and_illegal_names()
    {
        Assert.False(WindowsFileNames.IsValid("CON", out _));
        Assert.False(WindowsFileNames.IsValid("a<.txt", out _));
        Assert.False(WindowsFileNames.IsValid("ends.", out _));
        Assert.True(WindowsFileNames.IsValid("Vacation.jpg", out _));
        Assert.Equal(("Vacation", "jpg"), WindowsFileNames.Split("Vacation.jpg"));
        Assert.Equal("Hello World", WindowsFileNames.ApplyCase("hello world", RenameCaseMode.Title));
        Assert.Equal("007", WindowsFileNames.FormatCounter(7, 3));
    }
}

public class ArchiveFormatsTests
{
    [Fact]
    public void Detects_common_archive_extensions()
    {
        Assert.True(ArchiveFormats.IsArchive("pack.zip"));
        Assert.True(ArchiveFormats.IsArchive("film.7z"));
        Assert.True(ArchiveFormats.IsArchive("backup.rar"));
        Assert.True(ArchiveFormats.IsArchive("src.tar.gz"));
        Assert.True(ArchiveFormats.IsZipFamily("photos.cbz"));
        Assert.False(ArchiveFormats.IsArchive("notes.txt"));
        Assert.False(ArchiveFormats.IsArchive("report.docx"));
        Assert.Equal("2019-backup", ArchiveFormats.Stem("2019-backup.7z"));
        Assert.Equal("bundle", ArchiveFormats.Stem("bundle.tar.gz"));
    }

    [Fact]
    public void Rejects_unsafe_archive_entry_paths()
    {
        Assert.True(ArchiveFormats.TryNormalizeEntryPath("docs/a.txt", out var ok));
        Assert.Equal(@"docs\a.txt", ok);
        Assert.False(ArchiveFormats.TryNormalizeEntryPath(@"..\escape.txt", out _));
        Assert.False(ArchiveFormats.TryNormalizeEntryPath(@"C:\abs.txt", out _));
        Assert.False(ArchiveFormats.TryNormalizeEntryPath("/", out _));
    }
}

public class VolumeIdentityTests
{
    [Fact]
    public void Matches_volume_guid_across_drive_letters()
    {
        var known = new List<Source>
        {
            new()
            {
                Id = 1,
                StableKey = "a",
                DisplayName = "SanDisk Ultra 64 GB",
                VolumeGuid = @"\\?\Volume{abc}\",
                LastRootPath = @"E:\",
                Kind = SourceKind.Removable
            }
        };
        var fp = new VolumeFingerprint
        {
            Kind = SourceKind.Removable,
            VolumeGuid = @"\\?\Volume{abc}\",
            RootPath = @"G:\",
            DisplayName = "SanDisk"
        };
        var match = VolumeIdentityMatcher.Match(fp, known);
        Assert.NotNull(match.Source);
        Assert.Equal(1, match.Source!.Id);
        Assert.Equal(VolumeIdentityMatcher.MatchStrength.Guid, match.Strength);
        Assert.False(match.Ambiguous);
    }

    [Fact]
    public void Matches_unc_share()
    {
        var known = new List<Source>
        {
            new()
            {
                Id = 7,
                StableKey = "s",
                DisplayName = @"\\media\movies",
                Kind = SourceKind.Smb,
                LastRootPath = @"\\Media\Movies"
            }
        };
        var fp = new VolumeFingerprint { Kind = SourceKind.Smb, RootPath = @"\\media\movies", DisplayName = "x" };
        Assert.Equal(7, VolumeIdentityMatcher.Match(fp, known).Source?.Id);
    }
}

public class LocationClassifierTests
{
    [Fact]
    public void Classifies_known_protected_locations()
    {
        var svi = LocationClassifier.Classify(
            @"C:\System Volume Information", "System Volume Information",
            AttributeFlags.Directory | AttributeFlags.Hidden | AttributeFlags.System, true);
        Assert.True(svi.IsProtected);
        Assert.True(svi.IsHidden);
        Assert.True(svi.IsSystem);
        Assert.False(svi.IsRecycleBin);

        var recycle = LocationClassifier.Classify(
            @"D:\$RECYCLE.BIN", "$RECYCLE.BIN",
            AttributeFlags.Directory | AttributeFlags.Hidden | AttributeFlags.System, true);
        Assert.True(recycle.IsProtected);
        Assert.True(recycle.IsRecycleBin);

        var pagefile = LocationClassifier.Classify(
            @"C:\pagefile.sys", "pagefile.sys", AttributeFlags.Hidden | AttributeFlags.System, false);
        Assert.True(pagefile.IsProtected);
        Assert.False(pagefile.IsRecycleBin);
    }

    [Fact]
    public void Does_not_treat_normal_hidden_user_files_as_protected()
    {
        var desktopIni = LocationClassifier.Classify(
            @"C:\Users\Ada\Desktop\desktop.ini", "desktop.ini",
            AttributeFlags.Hidden | AttributeFlags.System, false);
        Assert.True(desktopIni.IsHidden);
        Assert.True(desktopIni.IsSystem);
        Assert.False(desktopIni.IsProtected);

        var movies = LocationClassifier.Classify(
            @"C:\Movies", "Movies", AttributeFlags.Directory, true);
        Assert.False(movies.IsProtected);
        Assert.False(movies.IsHidden);
    }

    [Fact]
    public void Access_denied_marks_protected()
    {
        var info = LocationClassifier.Classify(@"C:\locked", "locked", AttributeFlags.Directory, true, accessDenied: true);
        Assert.True(info.AccessDenied);
        Assert.True(info.IsProtected);
    }
}

public class ExcludeEvaluatorTests
{
    [Fact]
    public void Excludes_path_glob_and_extension()
    {
        var ev = new ExcludeEvaluator(
        [
            new() { Kind = ExcludeKind.PathPrefix, Pattern = @"C:\Windows" },
            new() { Kind = ExcludeKind.Glob, Pattern = "node_modules" },
            new() { Kind = ExcludeKind.Extension, Pattern = "tmp" }
        ], skipHidden: false, skipSystem: false);

        Assert.True(ev.ShouldExclude(@"C:\Windows\System32", "System32", true, 0, null));
        Assert.True(ev.ShouldExclude(@"D:\proj\node_modules", "node_modules", true, 0, null));
        Assert.True(ev.ShouldExclude(@"D:\a.tmp", "a.tmp", false, 0, null));
        Assert.False(ev.ShouldExclude(@"D:\a.txt", "a.txt", false, 0, null));
    }

    [Fact]
    public void Hidden_policy()
    {
        var ev = new ExcludeEvaluator([], skipHidden: true, skipSystem: true);
        Assert.True(ev.ShouldExclude(@"C:\x", "x", false, AttributeFlags.Hidden, null));
    }
}

public class ReparsePolicyTests
{
    [Fact]
    public void Does_not_recurse_reparse_directories()
    {
        var item = new FileSystemItem
        {
            FullPath = @"C:\link",
            Name = "link",
            IsDirectory = true,
            Attributes = AttributeFlags.Directory | AttributeFlags.ReparsePoint,
            ReparseTag = ReparsePolicy.IoReparseTagSymlink
        };
        Assert.False(ReparsePolicy.ShouldRecurseIntoDirectory(item));
    }
}

public class DragDropPolicyTests
{
    [Fact]
    public void Modifiers_match_windows_explorer()
    {
        Assert.Equal(DropAction.Move, DragDropPolicy.Resolve(false, false, false, sameVolume: true));
        Assert.Equal(DropAction.Copy, DragDropPolicy.Resolve(false, false, false, sameVolume: false));
        Assert.Equal(DropAction.Copy, DragDropPolicy.Resolve(control: true, shift: false, alt: false, sameVolume: true));
        Assert.Equal(DropAction.Move, DragDropPolicy.Resolve(control: false, shift: true, alt: false, sameVolume: false));
        Assert.Equal(DropAction.Link, DragDropPolicy.Resolve(control: false, shift: false, alt: true, sameVolume: true));
        Assert.Equal(DropAction.Link, DragDropPolicy.Resolve(control: true, shift: true, alt: false, sameVolume: false));
    }

    [Fact]
    public void Rejects_virtual_and_self_targets()
    {
        Assert.True(DragDropPolicy.IsInvalidTarget([@"C:\Docs"], LocationRoots.ThisPc));
        Assert.True(DragDropPolicy.IsInvalidTarget([@"C:\Docs"], @"C:\Docs"));
        Assert.True(DragDropPolicy.IsInvalidTarget([@"C:\Docs"], @"C:\Docs\sub"));
        Assert.False(DragDropPolicy.IsInvalidTarget([@"C:\Docs\file.txt"], @"C:\Docs"));
        Assert.False(DragDropPolicy.IsInvalidTarget([@"C:\Docs"], @"D:\Other"));
    }

    [Fact]
    public void Same_volume_uses_drive_or_unc_share()
    {
        Assert.True(PathRules.IsSameVolume(@"C:\a", @"C:\b"));
        Assert.False(PathRules.IsSameVolume(@"C:\a", @"D:\b"));
        Assert.True(PathRules.IsSameVolume(@"\\media\movies\a", @"\\media\movies\b"));
        Assert.False(PathRules.IsSameVolume(@"\\media\movies\a", @"\\media\tv\b"));
    }
}

public class DuplicateClassifierTests
{
    [Fact]
    public void Same_source_and_file_id_is_hardlink_not_duplicate()
    {
        var entries = new[]
        {
            File(1, 10, 100),
            File(2, 10, 100)
        };
        Assert.True(DuplicateClassifier.IsHardlinkOnly(entries));
        Assert.Equal(DuplicateClass.Hardlink, DuplicateClassifier.Classify(entries, []));
        Assert.True(DuplicateClassifier.IsHiddenByDefault(DuplicateClass.Hardlink));
        Assert.Equal(0, DuplicateClassifier.ClassifyGroup(new DuplicateGroup { SizeBytes = 50, Entries = entries }, []).WastedBytes);
    }

    [Fact]
    public void Same_file_id_on_different_volumes_is_not_a_hardlink()
    {
        var entries = new[]
        {
            File(1, 10, 100, sourceId: 1),
            File(2, 10, 100, sourceId: 2)
        };
        Assert.False(DuplicateClassifier.IsHardlinkOnly(entries));
        Assert.Equal(DuplicateClass.Unknown, DuplicateClassifier.Classify(entries, []));
        Assert.Equal(2, DuplicateClassifier.UniqueFileCount(entries));
    }

    [Fact]
    public void Marked_intentional_relation_is_hidden_by_default()
    {
        var entries = new[] { File(1, 10, null), File(2, 11, null) };
        var relations = new[]
        {
            new FileRelation
            {
                LeftEntryId = 1,
                RightEntryId = 2,
                Kind = FileRelationKind.IntentionalDuplicate,
                Origin = FileRelationOrigin.User,
                CreatedUtc = DateTimeOffset.UtcNow
            }
        };
        var classified = DuplicateClassifier.Classify(entries, relations);
        Assert.Equal(DuplicateClass.Intentional, classified);
        Assert.True(DuplicateClassifier.IsHiddenByDefault(classified));
        Assert.False(DuplicateClassifier.IsHiddenByDefault(DuplicateClass.Unknown));
        Assert.False(DuplicateClassifier.IsHiddenByDefault(DuplicateClass.Accidental));
    }

    [Fact]
    public void Sync_and_backup_relations_classify_ahead_of_unknown()
    {
        var entries = new[] { File(1, 10, 1), File(2, 11, 2) };
        Assert.Equal(DuplicateClass.Synchronized, DuplicateClassifier.Classify(entries,
        [
            Rel(1, 2, FileRelationKind.SyncCopy)
        ]));
        Assert.Equal(DuplicateClass.Backup, DuplicateClassifier.Classify(entries,
        [
            Rel(1, 2, FileRelationKind.BackupCopy)
        ]));
    }

    private static IndexEntry File(long id, long sourceFileId, long? fileId, long sourceId = 1)
        => new()
        {
            Id = id,
            SourceId = sourceId,
            Name = id + ".bin",
            NameNorm = id + ".bin",
            PathRel = id + ".bin",
            SizeBytes = 50,
            FileId = fileId,
            LastSeenUtc = DateTimeOffset.UtcNow
        };

    private static FileRelation Rel(long left, long right, FileRelationKind kind)
        => new()
        {
            LeftEntryId = left,
            RightEntryId = right,
            Kind = kind,
            Origin = FileRelationOrigin.User,
            CreatedUtc = DateTimeOffset.UtcNow
        };
}

public class OperationProfileTests
{
    [Fact]
    public void Auto_run_is_copy_only()
    {
        var copy = new OperationProfile { Name = "Copy", DoCopy = true, AutoRun = true };
        Assert.True(copy.CanAutoRun);

        var compress = new OperationProfile { Name = "Archive", DoCopy = true, DoCompress = true, AutoRun = true };
        Assert.False(compress.CanAutoRun);

        var rename = new OperationProfile { Name = "Rename", DoCopy = true, DoRename = true, RenamePrefix = "x_", AutoRun = true };
        Assert.False(rename.CanAutoRun);
    }
}

public class FileClassifierTests
{
    [Fact]
    public void Extension_and_archive_signals()
    {
        Assert.Equal(FileCategory.Photos, Classify("sunset.jpg"));
        Assert.Equal(FileCategory.Video, Classify("clip.mkv"));
        Assert.Equal(FileCategory.Audio, Classify("track.mp3"));
        Assert.Equal(FileCategory.Documents, Classify("notes.pdf"));
        Assert.Equal(FileCategory.Installer, Classify("Git-64-bit.exe"));
        Assert.Equal(FileCategory.Archive, Classify("pack.7z"));
        Assert.Equal(FileCategory.Backup, Classify("db.bak"));
        Assert.Equal(FileCategory.Unknown, Classify("mystery.bin"));
    }

    [Fact]
    public void Folder_structure_and_git()
    {
        Assert.Equal(FileCategory.CodeRepository, Classify("Explorer", isDirectory: true, isRepoRoot: true));
        Assert.Equal(FileCategory.BuildOutput, Classify("node_modules", isDirectory: true));
        Assert.Equal(FileCategory.BuildOutput, Classify("bin", isDirectory: true));
        Assert.Equal(FileCategory.Photos, Classify("DCIM", isDirectory: true));
        Assert.Equal(FileCategory.SystemData, FileClassifier.Classify(
            "$RECYCLE.BIN", @"C:\$RECYCLE.BIN", true,
            AttributeFlags.Directory | AttributeFlags.Hidden | AttributeFlags.System).Category);
        Assert.True(FileClassifier.ShouldLeave(FileCategory.Unknown));
        Assert.True(FileClassifier.ShouldLeave(FileCategory.BuildOutput));
        Assert.False(FileClassifier.ShouldLeave(FileCategory.Photos));
    }

    [Fact]
    public void Majority_of_children_classifies_a_folder()
    {
        var mixed = FileClassifier.Classify(
            "Vacation", @"C:\Downloads\Vacation", true, AttributeFlags.Directory,
            childCategories: [FileCategory.Photos, FileCategory.Photos, FileCategory.Photos, FileCategory.Documents]);
        Assert.Equal(FileCategory.Photos, mixed.Category);

        var split = FileClassifier.Classify(
            "Misc", @"C:\Downloads\Misc", true, AttributeFlags.Directory,
            childCategories: [FileCategory.Photos, FileCategory.Video]);
        Assert.Equal(FileCategory.Unknown, split.Category);
    }

    private static FileCategory Classify(string name, bool isDirectory = false, bool isRepoRoot = false)
        => FileClassifier.Classify(name, @"C:\Downloads\" + name, isDirectory, isDirectory ? AttributeFlags.Directory : 0, isRepoRoot).Category;
}