using Explorer.Application;
using Explorer.Domain;
using Explorer.Domain.Abstractions;
using Explorer.Storage.Sqlite;
using Microsoft.Extensions.Logging.Abstractions;

namespace Explorer.Application.Tests;

public class SourceManagerTests
{
    [Fact]
    public async Task Removable_drive_keeps_stable_key_when_letter_changes()
    {
        var db = Path.Combine(Path.GetTempPath(), "ew-app", Guid.NewGuid().ToString("N"), "index.db");
        await using var store = new SqliteIndexStore(db, NullLogger<SqliteIndexStore>.Instance);
        await store.OpenAsync();
        var volumes = new FakeVolumes();
        volumes.Online =
        [
            new VolumeFingerprint
            {
                Kind = SourceKind.Removable,
                VolumeGuid = @"\\?\Volume{same}\",
                RootPath = @"E:\",
                DisplayName = "Stick E",
                VolumeSerial = 9,
                CapacityBytes = 64
            }
        ];
        var env = new FakeEnv(Path.GetDirectoryName(db)!);
        var mgr = new SourceManager(store, volumes, env, new SystemClock(), NullLogger<SourceManager>.Instance);
        await mgr.InitializeAsync();
        var first = (await store.Sources.GetAllAsync()).Single();
        var key = first.StableKey;

        volumes.Online =
        [
            new VolumeFingerprint
            {
                Kind = SourceKind.Removable,
                VolumeGuid = @"\\?\Volume{same}\",
                RootPath = @"G:\",
                DisplayName = "Stick G",
                VolumeSerial = 9,
                CapacityBytes = 64
            }
        ];
        await mgr.RefreshOnlineStateAsync();
        var again = (await store.Sources.GetAllAsync()).Single();
        Assert.Equal(key, again.StableKey);
        Assert.Equal(@"G:\", again.LastRootPath);
    }

    [Fact]
    public async Task Ensure_for_mapped_letter_creates_source()
    {
        var db = Path.Combine(Path.GetTempPath(), "ew-app", Guid.NewGuid().ToString("N"), "index.db");
        await using var store = new SqliteIndexStore(db, NullLogger<SqliteIndexStore>.Instance);
        await store.OpenAsync();
        var volumes = new FakeVolumes
        {
            Online =
            [
                new VolumeFingerprint
                {
                    Kind = SourceKind.Smb,
                    RootPath = @"Z:\",
                    DisplayName = "Z: (Network)",
                    Filesystem = "SMB"
                }
            ]
        };
        var env = new FakeEnv(Path.GetDirectoryName(db)!);
        var mgr = new SourceManager(store, volumes, env, new SystemClock(), NullLogger<SourceManager>.Instance);
        volumes.Online = [];
        await mgr.InitializeAsync();
        volumes.Online =
        [
            new VolumeFingerprint
            {
                Kind = SourceKind.Smb,
                RootPath = @"Z:\",
                DisplayName = "Z: (Network)",
                Filesystem = "SMB"
            }
        ];
        var source = await mgr.EnsureForPathAsync(@"Z:\Photos");
        Assert.NotNull(source);
        Assert.Equal(@"Z:\", source!.LastRootPath);
        var found = await mgr.FindByPathAsync(@"Z:\");
        Assert.Equal(source.Id, found!.Id);
    }
}

file sealed class FakeVolumes : IVolumeService
{
    public List<VolumeFingerprint> Online { get; set; } = [];
    public IReadOnlyList<VolumeFingerprint> EnumerateOnlineVolumes() => Online;
    public VolumeFingerprint? Probe(string path)
    {
        var root = Path.GetPathRoot(path)?.TrimEnd('\\');
        return Online.FirstOrDefault(v =>
            v.RootPath.TrimEnd('\\').Equals(root, StringComparison.OrdinalIgnoreCase)
            || v.RootPath.Equals(path, StringComparison.OrdinalIgnoreCase));
    }
    public bool IsPathReachable(string path) => Online.Any(v => path.StartsWith(v.RootPath.TrimEnd('\\'), StringComparison.OrdinalIgnoreCase));
}

file sealed class FakeEnv : IAppEnvironment
{
    public FakeEnv(string dir)
    {
        DataDirectory = dir;
        Directory.CreateDirectory(dir);
        DatabasePath = Path.Combine(dir, "index.db");
        LogDirectory = Path.Combine(dir, "logs");
        Directory.CreateDirectory(LogDirectory);
    }

    public string DataDirectory { get; }
    public string DatabasePath { get; }
    public string LogDirectory { get; }
}