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

namespace Explorer.Application.Tests;

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

    [Fact]
    public void Proposes_moves_and_leaves_unknown_and_build_output()
    {
        var fs = Tree()
            .Dir(@"C:\Downloads")
            .File(@"C:\Downloads\setup.exe", 10, T0)
            .File(@"C:\Downloads\photo.jpg", 20, T0)
            .File(@"C:\Downloads\clip.mkv", 30, T0)
            .File(@"C:\Downloads\notes.pdf", 8, T0)
            .File(@"C:\Downloads\pack.zip", 4, T0)
            .File(@"C:\Downloads\weird.bin", 1, T0)
            .Dir(@"C:\Downloads\node_modules")
            .File(@"C:\Downloads\node_modules\pkg.js", 1, T0)
            .Dir(@"C:\Software")
            .Dir(@"C:\Pictures")
            .Dir(@"C:\Videos")
            .Dir(@"C:\Docs")
            .Dir(@"C:\Archive");

        var plan = Build(fs);
        Assert.True(plan.CanEnqueue);
        Assert.Contains(plan.Operations, o => o.Op == TransferOp.Move && o.SourcePath.EndsWith("setup.exe") && o.DestinationPath == @"C:\Software\setup.exe");
        Assert.Contains(plan.Operations, o => o.DestinationPath == @"C:\Pictures\photo.jpg");
        Assert.Contains(plan.Operations, o => o.DestinationPath == @"C:\Videos\clip.mkv");
        Assert.Contains(plan.Operations, o => o.DestinationPath == @"C:\Docs\notes.pdf");
        Assert.Contains(plan.Operations, o => o.DestinationPath == @"C:\Archive\pack.zip");
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath.Contains("weird.bin", StringComparison.OrdinalIgnoreCase));
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath.Contains("node_modules", StringComparison.OrdinalIgnoreCase));
        Assert.Contains(plan.OrganizePreview, r => r.Name == "weird.bin" && r.Action == "Skip");
        Assert.Contains(plan.OrganizePreview, r => r.Name == "node_modules" && r.Action == "Skip");
    }

    [Fact]
    public void Git_repo_moves_as_a_unit_to_development()
    {
        var fs = Tree()
            .Dir(@"C:\Downloads")
            .Dir(@"C:\Downloads\Explorer")
            .File(@"C:\Downloads\Explorer\README.md", 1, T0)
            .Dir(@"C:\Dev");

        var plan = Build(fs, dest => dest.Development = @"C:\Dev", isRepoRoot: path => path.EndsWith(@"\Explorer", StringComparison.OrdinalIgnoreCase));
        Assert.Contains(plan.Operations, o => o.SourcePath == @"C:\Downloads\Explorer" && o.DestinationPath == @"C:\Dev\Explorer");
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath.Contains("README", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Missing_destination_skips_that_category()
    {
        var fs = Tree()
            .Dir(@"C:\Downloads")
            .File(@"C:\Downloads\setup.exe", 10, T0)
            .File(@"C:\Downloads\photo.jpg", 20, T0)
            .Dir(@"C:\Pictures");

        var plan = Build(fs, dest => dest.Installers = "");
        Assert.Contains(plan.Operations, o => o.DestinationPath == @"C:\Pictures\photo.jpg");
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath.EndsWith("setup.exe"));
        Assert.Contains(plan.OrganizePreview, r => r.Name == "setup.exe" && r.Action == "Skip");
    }

    [Fact]
    public void Old_installer_is_a_warning_still_proposed()
    {
        var old = T0.AddYears(-2);
        var fs = Tree()
            .Dir(@"C:\Downloads")
            .File(@"C:\Downloads\old.msi", 10, old)
            .Dir(@"C:\Software");

        var plan = Build(fs, now: T0);
        Assert.True(plan.CanEnqueue);
        Assert.Contains(plan.Operations, o => o.SourcePath.EndsWith("old.msi"));
        Assert.Contains(plan.Issues, i => i.Severity == PlanIssueSeverity.Warning && i.Message.Contains("Old", StringComparison.OrdinalIgnoreCase));
        Assert.Contains(plan.OrganizePreview, r => r.Name == "old.msi" && r.Detail == "Older than 1 year.");
    }

    [Fact]
    public void Offline_destination_is_an_error_and_does_not_enqueue()
    {
        var fs = Tree()
            .Dir(@"C:\Downloads")
            .File(@"C:\Downloads\photo.jpg", 20, T0)
            .Dir(@"Z:\Pictures");

        var plan = new ReorganizePlanner().Build(
            @"C:\Downloads",
            Map(d => d.Pictures = @"Z:\Pictures"),
            fs,
            path => path.StartsWith(@"C:\", StringComparison.OrdinalIgnoreCase),
            _ => false);
        Assert.False(plan.CanEnqueue);
        Assert.Empty(plan.Operations);
        Assert.Contains(plan.Issues, i => i.Message == "Destination is not available.");
    }

    [Fact]
    public void Destination_inside_the_source_is_allowed()
    {
        var fs = Tree()
            .Dir(@"C:\Downloads")
            .File(@"C:\Downloads\setup.exe", 10, T0)
            .Dir(@"C:\Downloads\Software");

        var plan = Build(fs, dest => dest.Installers = @"C:\Downloads\Software");
        Assert.True(plan.CanEnqueue);
        Assert.Contains(plan.Operations, o => o.DestinationPath == @"C:\Downloads\Software\setup.exe");
        Assert.DoesNotContain(plan.Operations, o => o.SourcePath == @"C:\Downloads\Software");
    }

    [Fact]
    public void Planner_does_not_move_files_itself()
    {
        var fs = Tree()
            .Dir(@"C:\Downloads")
            .File(@"C:\Downloads\photo.jpg", 20, T0)
            .Dir(@"C:\Pictures");

        var plan = Build(fs);
        Assert.NotEmpty(plan.Operations);
        Assert.NotNull(fs.GetItem(@"C:\Downloads\photo.jpg"));
        Assert.Null(fs.GetItem(@"C:\Pictures\photo.jpg"));
    }

    private static OperationPlan Build(
        IFileSystemEnumerator fs,
        Action<OrganizeDestinations>? configure = null,
        Func<string, bool>? isRepoRoot = null,
        DateTimeOffset? now = null)
        => new ReorganizePlanner().Build(
            @"C:\Downloads",
            Map(configure),
            fs,
            _ => true,
            isRepoRoot ?? (_ => false),
            now: now ?? T0,
            pathExists: _ => false);

    private static OrganizeDestinations Map(Action<OrganizeDestinations>? configure = null)
    {
        var dest = new OrganizeDestinations
        {
            Pictures = @"C:\Pictures",
            Videos = @"C:\Videos",
            Audio = @"C:\Music",
            Documents = @"C:\Docs",
            Installers = @"C:\Software",
            Archives = @"C:\Archive",
            Development = @"C:\Dev"
        };
        configure?.Invoke(dest);
        return dest;
    }

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