using Explorer.Application;
using Explorer.Domain;
using Explorer.Plugin.Abstractions;
using Explorer.Plugin.GoogleDrive;
using Explorer.Plugin.Nextcloud;
using Explorer.Plugin.OneDrive;
using Microsoft.Extensions.Logging.Abstractions;

namespace Explorer.Application.Tests;

public class CloudProviderTests
{
    [Fact]
    public async Task Quota_returns_null_when_provider_throws()
    {
        var registry = new StorageProviderRegistry([new QuotaThrowingProvider()], NullLogger<StorageProviderRegistry>.Instance);
        Assert.Null(await registry.TryGetQuotaAsync(@"C:\OneDrive"));
    }

    [Fact]
    public async Task Enrich_passes_through_when_provider_throws()
    {
        var registry = new StorageProviderRegistry([new ThrowingProvider()], NullLogger<StorageProviderRegistry>.Instance);
        var item = new FileSystemItem { FullPath = @"C:\a.txt", Name = "a.txt", SizeBytes = 10 };
        var result = await registry.EnrichAsync([item]);
        Assert.Single(result);
        Assert.Null(result[0].Cloud);
        Assert.Equal("a.txt", result[0].Name);
    }

    [Fact]
    public async Task Enrich_maps_provider_state()
    {
        var registry = new StorageProviderRegistry([new StubProvider()], NullLogger<StorageProviderRegistry>.Instance);
        var item = new FileSystemItem { FullPath = @"C:\OneDrive\photo.jpg", Name = "photo.jpg", SizeBytes = 100 };
        var result = await registry.EnrichAsync([item]);
        Assert.Equal(Explorer.Domain.CloudAvailability.OnlineOnly, result[0].Cloud?.Availability);
        Assert.Equal(8, result[0].AllocatedSizeBytes);
        Assert.True(result[0].Cloud?.MayHydrateOnRead);
    }

    [Fact]
    public void Hydration_guard_skips_online_only_and_recall_attributes()
    {
        var registry = new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance);
        var guard = new HydrationGuard(registry);
        Assert.True(guard.WouldHydrateOnRead(AttributeFlags.RecallOnDataAccess, null));
        Assert.True(guard.WouldHydrateOnRead(0, Explorer.Domain.CloudAvailability.OnlineOnly));
        Assert.False(guard.WouldHydrateOnRead(0, Explorer.Domain.CloudAvailability.LocallyAvailable));
        Assert.True(guard.WouldHydrateOnRead(new FileSystemItem
        {
            FullPath = @"C:\x",
            Name = "x",
            Cloud = new CloudPresence("onedrive", Explorer.Domain.CloudAvailability.OnlineOnly, 1, 0, true)
        }));
    }

    [Theory]
    [InlineData(OneDrivePlaceholderState.RecallOnDataAccess, null, Plugin.Abstractions.CloudAvailability.OnlineOnly)]
    [InlineData(OneDrivePlaceholderState.Pinned, null, Plugin.Abstractions.CloudAvailability.Pinned)]
    [InlineData(0, CloudFilesNativeStates.Invalid, Plugin.Abstractions.CloudAvailability.Error)]
    [InlineData(0, CloudFilesNativeStates.PlaceholderInSync, Plugin.Abstractions.CloudAvailability.LocallyAvailable)]
    public void OneDrive_maps_attributes_to_availability(int attributes, uint? cf, Plugin.Abstractions.CloudAvailability expected)
    {
        Assert.Equal(expected, OneDrivePlaceholderState.MapAvailability(attributes, cf));
        var state = OneDrivePlaceholderState.FromLocalSignals("onedrive", @"C:\OneDrive\f", attributes, 0, 50, 4, cf);
        Assert.Equal(expected, state.Availability);
        if (expected == Plugin.Abstractions.CloudAvailability.OnlineOnly)
        {
            Assert.True(state.MayHydrateOnRead);
        }
    }

    [Fact]
    public void Disabled_provider_is_ignored()
    {
        var registry = new StorageProviderRegistry([new StubProvider()], NullLogger<StorageProviderRegistry>.Instance);
        registry.SetEnabled("onedrive", false);
        Assert.Null(registry.Find(@"C:\OneDrive\a"));
        Assert.False(registry.HasCapability(@"C:\OneDrive\a", ProviderCapability.Pin));
        Assert.Empty(registry.GetPlaces());
    }

    [Fact]
    public void GetPlaces_fail_open_when_provider_throws()
    {
        var registry = new StorageProviderRegistry([new ThrowingPlacesProvider()], NullLogger<StorageProviderRegistry>.Instance);
        Assert.Empty(registry.GetPlaces());
    }

    [Theory]
    [InlineData("Personal", @"C:\Users\x\OneDrive", null, "Dominique", "Dominique - Personal")]
    [InlineData("Business1", @"C:\Users\x\OneDrive - Contoso", "Contoso", "Dominique", "Dominique - Contoso")]
    [InlineData("Business1", @"C:\Users\x\OneDrive - Contoso", null, null, "OneDrive - Contoso")]
    [InlineData("Personal", @"C:\Users\x\OneDrive", null, null, "OneDrive")]
    public void OneDrive_place_label(string key, string folder, string? display, string? user, string expected)
        => Assert.Equal(expected, OneDrivePlaceDiscovery.BuildLabel(key, folder, display, user));

    [Fact]
    public void Cloud_place_store_merges_manual_without_duplicates()
    {
        var discovered = new ProviderPlace[]
        {
            new("onedrive", "Dominique - Personal", @"C:\Users\x\OneDrive")
        };
        var manual = new ProviderPlace[]
        {
            new("onedrive", "Work", @"C:\Users\x\OneDrive - Contoso"),
            new("onedrive", "Dup", @"C:\Users\x\OneDrive")
        };
        var merged = CloudPlaceStore.Merge(discovered, manual);
        Assert.Equal(2, merged.Count);
        Assert.Equal("Dominique - Personal", merged[0].DisplayName);
        Assert.Equal(@"C:\Users\x\OneDrive - Contoso", merged[1].Path);
    }

    [Fact]
    public void Cloud_path_is_under_is_prefix_safe()
    {
        Assert.True(CloudPath.IsUnder(@"F:\OneDrive - wyniger", @"F:\OneDrive - wyniger\Obsidian\Notes"));
        Assert.False(CloudPath.IsUnder(@"F:\OneDrive", @"F:\OneDrive - wyniger"));
        Assert.True(CloudPath.IsUnder(@"J:\", @"J:\My Drive\Photos"));
        Assert.Equal(@"J:\", CloudPath.NormalizePlace("j:"));
        Assert.Equal(@"J:\", CloudPath.NormalizePlace(@"J:\"));
    }

    [Fact]
    public void DriveFS_media_named_google_drive_becomes_a_place()
    {
        var places = DriveFsPreferenceReader.PlacesFromTables(
            [
                new("Games", @"D:\", 4),
                new("Google Drive", @"J:\", 10),
                new("MP3", @"G:\", 4)
            ],
            [
                new("My Drive", @"My Drive", @"J:\My Drive", true)
            ]);
        Assert.Single(places);
        Assert.Equal("googledrive", places[0].ProviderId);
        Assert.Equal("Google Drive", places[0].DisplayName);
        Assert.Equal(@"J:\", places[0].Path);
    }

    [Fact]
    public void DriveFS_mirrored_folder_becomes_a_place_when_no_mount()
    {
        var places = DriveFsPreferenceReader.PlacesFromTables(
            [new("Data", @"F:\", 4)],
            [new("Photos", @"Photos", @"F:\Google Photos", false)]);
        Assert.Single(places);
        Assert.Equal("Google Drive - Photos", places[0].DisplayName);
        Assert.Equal(@"F:\Google Photos", places[0].Path);
    }

    [Fact]
    public void DriveFS_local_preference_db_exposes_configured_mount()
    {
        if (!File.Exists(DriveFsPreferenceReader.DefaultDatabasePath))
        {
            return;
        }

        var places = DriveFsPreferenceReader.ReadPlaces();
        Assert.Contains(places, p => p.DisplayName == "Google Drive" && p.Path.Length >= 2);
    }

    [Theory]
    [InlineData(@"C:\Users\x\My Drive", "Google Drive")]
    [InlineData(@"G:\Shared drives", "Shared drives")]
    [InlineData(@"D:\Work", "Google Drive - Work")]
    public void Google_drive_place_label(string path, string expected)
        => Assert.Equal(expected, GoogleDrivePlaceDiscovery.BuildLabel(path, null));

    [Fact]
    public void Nextcloud_parses_account_folders_from_cfg()
    {
        const string cfg = """
            [Accounts]
            0\url=https://cloud.example.com
            0\displayName=Dominique Wyniger
            0\Folders\1\localPath=F:/OneDrive - wyniger/Obsidian/Notes/
            0\Folders\1\targetPath=/Notizen/Notes
            0\Folders\1\virtualFilesMode=off
            """;
        var places = NextcloudPlaceDiscovery.ParseCfg(cfg);
        Assert.Single(places);
        Assert.Equal("nextcloud", places[0].ProviderId);
        Assert.Equal(@"F:\OneDrive - wyniger\Obsidian\Notes", places[0].Path);
        Assert.Equal("Nextcloud - Notes", places[0].DisplayName);
    }

    [Fact]
    public void OneDrive_does_not_claim_google_drive_paths()
    {
        Assert.False(OneDriveStorageProvider.LooksLikeOneDrive(@"G:\My Drive\Photos"));
        Assert.True(GoogleDriveStorageProvider.LooksLikeGoogleDrive(@"G:\My Drive\Photos"));
    }

    [Fact]
    public void Discover_skips_missing_default_profile_folders()
    {
        var profile = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
        var google = GoogleDrivePlaceDiscovery.Discover();
        var nextcloud = NextcloudPlaceDiscovery.Discover();
        AssertMissingGuess(google, Path.Combine(profile, "Google Drive"));
        AssertMissingGuess(google, Path.Combine(profile, "My Drive"));
        AssertMissingGuess(nextcloud, Path.Combine(profile, "Nextcloud"));
        AssertMissingGuess(nextcloud, Path.Combine(profile, "ownCloud"));
    }

    private static void AssertMissingGuess(IReadOnlyList<ProviderPlace> places, string path)
    {
        if (Directory.Exists(path))
        {
            return;
        }

        Assert.DoesNotContain(places, p => p.Path.Equals(path.TrimEnd('\\'), StringComparison.OrdinalIgnoreCase));
    }
}

file static class CloudFilesNativeStates
{
    public const uint PlaceholderInSync = 0x1 | 0x8;
    public const uint Invalid = 0xFFFFFFFF;
}

file sealed class ThrowingPlacesProvider : IStorageProvider
{
    public ProviderManifest Manifest { get; } = new("boom", "Boom", "1", ProviderIsolation.InProcess);
    public ProviderCapability GetCapabilities() => ProviderCapability.CloudState;
    public bool TryMatchRoot(string path) => false;
    public IReadOnlyList<ProviderPlace> GetPlaces() => throw new InvalidOperationException("places failed");
    public Task<IReadOnlyList<ProviderItemState>> GetItemStatesAsync(IReadOnlyList<string> paths, CancellationToken cancellationToken = default)
        => Task.FromResult<IReadOnlyList<ProviderItemState>>([]);
    public Task<ProviderActionResult> TryInvokeAsync(ProviderActionRequest request, CancellationToken cancellationToken = default)
        => Task.FromResult(new ProviderActionResult(ProviderActionStatus.Unsupported));
    public Task<ProviderQuota?> TryGetQuotaAsync(string rootPath, CancellationToken cancellationToken = default)
        => Task.FromResult<ProviderQuota?>(null);
}

file sealed class ThrowingProvider : IStorageProvider
{
    public ProviderManifest Manifest { get; } = new("boom", "Boom", "1", ProviderIsolation.InProcess);
    public ProviderCapability GetCapabilities() => ProviderCapability.CloudState;
    public bool TryMatchRoot(string path) => throw new InvalidOperationException("match failed");
    public Task<IReadOnlyList<ProviderItemState>> GetItemStatesAsync(IReadOnlyList<string> paths, CancellationToken cancellationToken = default)
        => throw new InvalidOperationException("state failed");
    public Task<ProviderActionResult> TryInvokeAsync(ProviderActionRequest request, CancellationToken cancellationToken = default)
        => throw new InvalidOperationException("invoke failed");
    public Task<ProviderQuota?> TryGetQuotaAsync(string rootPath, CancellationToken cancellationToken = default)
        => throw new InvalidOperationException("quota failed");
}

file sealed class QuotaThrowingProvider : IStorageProvider
{
    public ProviderManifest Manifest { get; } = new("onedrive", "OneDrive", "1", ProviderIsolation.InProcess);
    public ProviderCapability GetCapabilities() => ProviderCapability.Quota;
    public bool TryMatchRoot(string path) => path.Contains("OneDrive", StringComparison.OrdinalIgnoreCase);
    public Task<IReadOnlyList<ProviderItemState>> GetItemStatesAsync(IReadOnlyList<string> paths, CancellationToken cancellationToken = default)
        => Task.FromResult<IReadOnlyList<ProviderItemState>>([]);
    public Task<ProviderActionResult> TryInvokeAsync(ProviderActionRequest request, CancellationToken cancellationToken = default)
        => Task.FromResult(new ProviderActionResult(ProviderActionStatus.Unsupported));
    public Task<ProviderQuota?> TryGetQuotaAsync(string rootPath, CancellationToken cancellationToken = default)
        => throw new InvalidOperationException("quota failed");
}

file sealed class StubProvider : IStorageProvider
{
    public ProviderManifest Manifest { get; } = new("onedrive", "OneDrive", "1", ProviderIsolation.InProcess);
    public ProviderCapability GetCapabilities() => ProviderCapability.CloudState | ProviderCapability.Pin | ProviderCapability.Dehydrate;
    public bool TryMatchRoot(string path) => path.Contains("OneDrive", StringComparison.OrdinalIgnoreCase);
    public Task<IReadOnlyList<ProviderItemState>> GetItemStatesAsync(IReadOnlyList<string> paths, CancellationToken cancellationToken = default)
        => Task.FromResult<IReadOnlyList<ProviderItemState>>(paths.Select(p => new ProviderItemState(
            "onedrive", p, Plugin.Abstractions.CloudAvailability.OnlineOnly, 100, 8, true, true, "Online-only", null)).ToList());
    public Task<ProviderActionResult> TryInvokeAsync(ProviderActionRequest request, CancellationToken cancellationToken = default)
        => Task.FromResult(new ProviderActionResult(ProviderActionStatus.Succeeded));
    public Task<ProviderQuota?> TryGetQuotaAsync(string rootPath, CancellationToken cancellationToken = default)
        => Task.FromResult<ProviderQuota?>(null);
}