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

namespace Explorer.Application.Tests;

public class FileOperationProfilePlannerTests
{
    private static readonly DateTimeOffset T0 = DateTimeOffset.Parse("2024-06-01T12:00:00Z");

    [Fact]
    public void Copy_lists_copy_operations_only()
    {
        var fs = Tree()
            .Dir(@"C:\src")
            .File(@"C:\src\a.txt", 1, T0)
            .File(@"C:\src\b.txt", 2, T0)
            .Dir(@"C:\dst");

        var plan = Build(CopyProfile(), fs, [@"C:\src"]);
        Assert.True(plan.CanEnqueue);
        Assert.All(plan.Operations, o => Assert.Equal(TransferOp.Copy, o.Op));
        Assert.Contains(plan.Operations, o => o.SourcePath == @"C:\src\a.txt" && o.DestinationPath == @"C:\dst\src\a.txt");
        Assert.Contains(plan.Operations, o => o.SourcePath == @"C:\src\b.txt" && o.DestinationPath == @"C:\dst\src\b.txt");
        Assert.Contains(plan.ProfilePreview, r => r.Action == "Copy" && r.Path == @"C:\dst\src\a.txt");
    }

    [Fact]
    public void Compress_lists_one_archive_job()
    {
        var fs = Tree()
            .Dir(@"C:\src")
            .File(@"C:\src\a.txt", 1, T0)
            .File(@"C:\src\b.txt", 2, T0)
            .Dir(@"C:\dst");

        var plan = Build(new OperationProfile
        {
            Name = "Archive",
            DestPath = @"C:\dst",
            DoCompress = true
        }, fs, [@"C:\src"]);
        Assert.True(plan.CanEnqueue);
        var compress = Assert.Single(plan.Operations);
        Assert.Equal(TransferOp.Compress, compress.Op);
        Assert.Equal(@"C:\src\a.txt|C:\src\b.txt", compress.SourcePath);
        Assert.Equal(@"C:\dst\src.7z", compress.DestinationPath);
        Assert.Contains(plan.ProfilePreview, r => r.Action == "Compress");
    }

    [Fact]
    public void Dirty_git_stops_before_operations()
    {
        var fs = Tree()
            .Dir(@"C:\src")
            .File(@"C:\src\a.txt", 1, T0)
            .Dir(@"C:\dst");
        var git = new GitStatus { RepoRoot = @"C:\src", Branch = "main", ModifiedCount = 1 };

        var plan = Build(CopyProfile(git: true), fs, [@"C:\src"], git);
        Assert.False(plan.CanEnqueue);
        Assert.Empty(plan.Operations);
        Assert.Contains(plan.Issues, i => i.Message == "Working tree is not clean.");
    }

    [Fact]
    public void Missing_git_and_missing_repo_are_errors()
    {
        var fs = Tree().Dir(@"C:\src").File(@"C:\src\a.txt", 1, T0).Dir(@"C:\dst");
        var noGit = Build(CopyProfile(git: true), fs, [@"C:\src"], gitAvailable: false);
        Assert.Contains(noGit.Issues, i => i.Message == "git.exe is not available.");

        var noRepo = Build(CopyProfile(git: true), fs, [@"C:\src"], git: null);
        Assert.Contains(noRepo.Issues, i => i.Message == "Source is not a Git repository.");
    }

    [Fact]
    public void Offline_destination_is_an_error()
    {
        var fs = Tree()
            .Dir(@"C:\src")
            .File(@"C:\src\a.txt", 1, T0)
            .Dir(@"Z:\backup");

        var plan = Build(
            CopyProfile(@"Z:\backup"),
            fs,
            [@"C:\src"],
            reachable: path => path.StartsWith(@"C:\", StringComparison.OrdinalIgnoreCase));
        Assert.False(plan.CanEnqueue);
        Assert.Empty(plan.Operations);
        Assert.Contains(plan.Issues, i => i.Message == "Destination is not available.");
    }

    [Fact]
    public void Rename_then_copy_uses_new_names()
    {
        var fs = Tree()
            .Dir(@"C:\src")
            .File(@"C:\src\keep.txt", 1, T0)
            .File(@"C:\src\a.txt", 1, T0)
            .Dir(@"C:\dst");

        var plan = Build(new OperationProfile
        {
            Name = "Rename copy",
            DestPath = @"C:\dst",
            DoCopy = true,
            DoRename = true,
            RenamePrefix = "x_"
        }, fs, [@"C:\src"]);
        Assert.True(plan.CanEnqueue);
        Assert.Contains(plan.Operations, o => o.Op == TransferOp.Rename && o.NewName == "x_keep.txt");
        Assert.Contains(plan.Operations, o =>
            o.Op == TransferOp.Copy
            && o.SourcePath == @"C:\src\x_a.txt"
            && o.DestinationPath == @"C:\dst\src\x_a.txt");
        Assert.Contains(plan.Operations, o =>
            o.Op == TransferOp.Copy
            && o.SourcePath == @"C:\src\x_keep.txt"
            && o.DestinationPath == @"C:\dst\src\x_keep.txt");
    }

    [Fact]
    public void Excludes_and_online_only_files_are_skipped()
    {
        var fs = Tree()
            .Dir(@"C:\src")
            .File(@"C:\src\keep.txt", 1, T0)
            .File(@"C:\src\skip.tmp", 1, T0)
            .Dir(@"C:\src\bin")
            .File(@"C:\src\cloud.bin", 1, T0)
            .Dir(@"C:\dst");

        var plan = Build(new OperationProfile
        {
            Name = "Copy",
            DestPath = @"C:\dst",
            DoCopy = true,
            Excludes = "*.tmp\nbin"
        }, fs, [@"C:\src"], wouldHydrate: item => item.Name == "cloud.bin");
        Assert.Contains(plan.Operations, o => o.SourcePath.EndsWith("keep.txt", StringComparison.OrdinalIgnoreCase));
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath.EndsWith("skip.tmp", StringComparison.OrdinalIgnoreCase));
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath.Contains(@"\bin", StringComparison.OrdinalIgnoreCase));
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath.EndsWith("cloud.bin", StringComparison.OrdinalIgnoreCase));
        Assert.Contains(plan.Issues, i => i.Message.Contains("Online-only", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Missing_7zip_is_an_error()
    {
        var fs = Tree().Dir(@"C:\src").File(@"C:\src\a.txt", 1, T0).Dir(@"C:\dst");
        var plan = Build(new OperationProfile
        {
            Name = "Archive",
            DestPath = @"C:\dst",
            DoCompress = true
        }, fs, [@"C:\src"], compressAvailable: false);
        Assert.False(plan.CanEnqueue);
        Assert.Contains(plan.Issues, i => i.Message.Contains("7-Zip", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Convert_lists_one_job_per_matching_file()
    {
        var fs = Tree()
            .Dir(@"C:\src")
            .File(@"C:\src\clip.mov", 10, T0)
            .File(@"C:\src\notes.txt", 1, T0)
            .Dir(@"C:\dst");

        var plan = Build(new OperationProfile
        {
            Name = "Convert",
            DestPath = @"C:\dst",
            DoConvert = true,
            ConversionKind = ConversionKind.VideoToMp4
        }, fs, [@"C:\src"]);
        Assert.True(plan.CanEnqueue);
        var convert = Assert.Single(plan.Operations);
        Assert.Equal(TransferOp.Convert, convert.Op);
        Assert.Equal(@"C:\src\clip.mov", convert.SourcePath);
        Assert.Equal(@"C:\dst\clip.mp4", convert.DestinationPath);
        Assert.Contains(plan.ProfilePreview, r => r.Action == "Convert");
    }

    [Fact]
    public void Missing_ffmpeg_is_an_error()
    {
        var fs = Tree().Dir(@"C:\src").File(@"C:\src\clip.mov", 10, T0).Dir(@"C:\dst");
        var plan = Build(new OperationProfile
        {
            Name = "Convert",
            DestPath = @"C:\dst",
            DoConvert = true
        }, fs, [@"C:\src"], convertAvailable: false);
        Assert.False(plan.CanEnqueue);
        Assert.Contains(plan.Issues, i => i.Message.Contains("FFmpeg", StringComparison.OrdinalIgnoreCase));
    }

    private static OperationProfile CopyProfile(string dest = @"C:\dst", bool git = false)
        => new()
        {
            Name = "Copy",
            DestPath = dest,
            DoCopy = true,
            RequireGitClean = git
        };

    private static OperationPlan Build(
        OperationProfile profile,
        IFileSystemEnumerator fs,
        string[] sources,
        GitStatus? git = null,
        bool gitAvailable = true,
        bool compressAvailable = true,
        bool convertAvailable = true,
        Func<string, bool>? reachable = null,
        Func<FileSystemItem, bool>? wouldHydrate = null)
        => new FileOperationProfilePlanner(new RenamePlanner()).Build(
            profile,
            sources,
            fs,
            reachable ?? (_ => true),
            git,
            gitAvailable,
            compressAvailable,
            SevenZipLocator.MissingHint,
            pathExists: _ => false,
            wouldHydrate: wouldHydrate,
            convertAvailable: convertAvailable,
            convertMissingHint: FfmpegLocator.MissingHint);

    private static TreeEnumerator Tree() => new();
}