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

namespace Explorer.Storage.Tests;

internal static class Stores
{
    public static async Task<SqliteIndexStore> Open()
    {
        var path = Path.Combine(Path.GetTempPath(), "ew-tests", Guid.NewGuid().ToString("N"), "index.db");
        var store = new SqliteIndexStore(path, NullLogger<SqliteIndexStore>.Instance);
        await store.OpenAsync();
        return store;
    }

    public static async Task<Source> AddSourceAsync(this IIndexStore store, string root)
    {
        var s = new Source
        {
            StableKey = Guid.NewGuid().ToString("N"),
            Kind = SourceKind.NtfsLocal,
            DisplayName = "Test",
            LastRootPath = root,
            Status = SourceStatus.Online
        };
        s.Id = await store.Sources.UpsertAsync(s);
        return s;
    }
}

public class SchemaTests
{
    [Fact]
    public async Task Opens_and_quick_check_ok()
    {
        await using var store = await Stores.Open();
        var check = await store.QuickCheckAsync();
        Assert.Equal("ok", check, ignoreCase: true);
        await store.Analysis.EnsureReadyAsync();
        await store.Analysis.EnsureReadyAsync();
        Assert.Empty(await store.Analysis.GetDirectoryRootsAsync());
        Assert.Equal(await store.Analysis.GetIndexStampAsync(), await store.Analysis.GetIndexStampAsync());
    }

    [Fact]
    public async Task Source_roundtrip_and_identity_fields()
    {
        await using var store = await Stores.Open();
        var source = await store.AddSourceAsync(@"T:\");
        Assert.True(source.Id > 0);
        source.VolumeGuid = @"\\?\Volume{xyz}\";
        source.VolumeSerial = 1234;
        await store.Sources.UpsertAsync(source);
        var loaded = await store.Sources.GetAsync(source.Id);
        Assert.Equal(@"\\?\Volume{xyz}\", loaded!.VolumeGuid);
        Assert.Equal(1234, loaded.VolumeSerial);
    }
}

public class EntryAndSearchTests
{
    [Fact]
    public async Task Upsert_is_idempotent_and_search_filters_work()
    {
        await using var store = await Stores.Open();
        var source = await store.AddSourceAsync(@"C:\data");
        var root = new IndexEntry
        {
            SourceId = source.Id,
            Name = "data",
            NameNorm = "data",
            IsDirectory = true,
            PathRel = "",
            LastSeenUtc = DateTimeOffset.UtcNow,
            ScanGeneration = 1,
            Status = EntryStatus.Present
        };
        root.Id = await store.Entries.UpsertAsync(root);
        var file = new IndexEntry
        {
            SourceId = source.Id,
            ParentId = root.Id,
            Name = "Movie.mkv",
            NameNorm = "movie.mkv",
            Extension = "mkv",
            IsDirectory = false,
            SizeBytes = 12L * 1024 * 1024 * 1024,
            PathRel = "Movie.mkv",
            LastSeenUtc = DateTimeOffset.UtcNow,
            ModifiedUtc = DateTimeOffset.Parse("2024-06-01Z"),
            ScanGeneration = 1
        };
        var id1 = await store.Entries.UpsertAsync(file);
        file.SizeBytes = 13L * 1024 * 1024 * 1024;
        var id2 = await store.Entries.UpsertAsync(file);
        Assert.Equal(id1, id2);

        var found = await store.Search.SearchAsync(new SearchRequest
        {
            Name = "*.mkv",
            MinSize = 10L * 1024 * 1024 * 1024,
            SourceIds = [source.Id],
            Take = 50
        });
        Assert.Contains(found, e => e.Name == "Movie.mkv");

        var byDate = await store.Search.SearchAsync(new SearchRequest
        {
            ModifiedBefore = DateTimeOffset.Parse("2025-01-01Z"),
            SourceIds = [source.Id]
        });
        Assert.Contains(byDate, e => e.Name == "Movie.mkv");
    }

    [Fact]
    public async Task Folder_aggregates_and_tombstones()
    {
        await using var store = await Stores.Open();
        var source = await store.AddSourceAsync(@"C:\lib");
        var root = new IndexEntry { SourceId = source.Id, Name = "lib", NameNorm = "lib", IsDirectory = true, PathRel = "", LastSeenUtc = DateTimeOffset.UtcNow };
        root.Id = await store.Entries.UpsertAsync(root);
        var dir = new IndexEntry { SourceId = source.Id, ParentId = root.Id, Name = "Movies", NameNorm = "movies", IsDirectory = true, PathRel = "Movies", LastSeenUtc = DateTimeOffset.UtcNow };
        dir.Id = await store.Entries.UpsertAsync(dir);
        var file = new IndexEntry
        {
            SourceId = source.Id,
            ParentId = dir.Id,
            Name = "a.bin",
            NameNorm = "a.bin",
            IsDirectory = false,
            SizeBytes = 1000,
            PathRel = @"Movies\a.bin",
            LastSeenUtc = DateTimeOffset.UtcNow
        };
        file.Id = await store.Entries.UpsertAsync(file);
        await store.Entries.ApplySizeDeltaToAncestorsAsync(dir.Id, 1000, 1, 0);
        var loadedDir = await store.Entries.GetAsync(dir.Id);
        Assert.Equal(1000, loadedDir!.AggregateSize);
        await store.Entries.TombstoneAsync(file.Id, DateTimeOffset.UtcNow);
        loadedDir = await store.Entries.GetAsync(dir.Id);
        Assert.Equal(0, loadedDir!.AggregateSize);
        var tomb = await store.Entries.GetAsync(file.Id);
        Assert.Equal(EntryStatus.Deleted, tomb!.Status);
        await store.Entries.DeleteExpiredTombstonesAsync(DateTimeOffset.UtcNow.AddDays(1));
        Assert.Null(await store.Entries.GetAsync(file.Id));
    }

    [Fact]
    public async Task Rename_updates_subtree_paths()
    {
        await using var store = await Stores.Open();
        var source = await store.AddSourceAsync(@"C:\r");
        var root = new IndexEntry { SourceId = source.Id, Name = "r", NameNorm = "r", IsDirectory = true, PathRel = "", LastSeenUtc = DateTimeOffset.UtcNow };
        root.Id = await store.Entries.UpsertAsync(root);
        var dir = new IndexEntry { SourceId = source.Id, ParentId = root.Id, Name = "Old", NameNorm = "old", IsDirectory = true, PathRel = "Old", LastSeenUtc = DateTimeOffset.UtcNow };
        dir.Id = await store.Entries.UpsertAsync(dir);
        var file = new IndexEntry { SourceId = source.Id, ParentId = dir.Id, Name = "f.txt", NameNorm = "f.txt", PathRel = @"Old\f.txt", LastSeenUtc = DateTimeOffset.UtcNow };
        file.Id = await store.Entries.UpsertAsync(file);
        await store.Entries.RenameSubtreePathAsync(source.Id, "Old", "New");
        var moved = await store.Entries.GetAsync(file.Id);
        Assert.Equal(@"New\f.txt", moved!.PathRel);
    }

    [Fact]
    public async Task Duplicate_candidates_are_same_size_groups()
    {
        await using var store = await Stores.Open();
        var source = await store.AddSourceAsync(@"C:\d");
        var root = new IndexEntry { SourceId = source.Id, Name = "d", NameNorm = "d", IsDirectory = true, PathRel = "", LastSeenUtc = DateTimeOffset.UtcNow };
        root.Id = await store.Entries.UpsertAsync(root);
        foreach (var name in new[] { "a.bin", "b.bin", "c.bin" })
        {
            await store.Entries.UpsertAsync(new IndexEntry
            {
                SourceId = source.Id,
                ParentId = root.Id,
                Name = name,
                NameNorm = name,
                IsDirectory = false,
                SizeBytes = name == "c.bin" ? 50 : 100,
                PathRel = name,
                LastSeenUtc = DateTimeOffset.UtcNow
            });
        }

        await store.Hashes.EnqueueSizeCollisionsAsync(source.Id);
        var work = await store.Hashes.DequeueAsync(10);
        Assert.Equal(2, work.Count);
        Assert.All(work, w => Assert.Equal(100, w.SizeBytes));
    }
}

public class TransferStoreTests
{
    [Fact]
    public async Task Incomplete_jobs_roundtrip_and_history_is_append_only()
    {
        await using var store = await Stores.Open();
        var queued = new TransferJob
        {
            Op = TransferOp.Copy,
            SourcePath = @"D:\src\a.txt",
            DestinationPath = @"E:\dst\a.txt",
            Status = TransferStatus.Queued,
            CreatedUtc = DateTimeOffset.UtcNow,
            RetryCount = 0,
            WaitReason = null
        };
        queued.Id = await store.Transfers.InsertAsync(queued);
        Assert.True(queued.Id > 0);
        Assert.True(queued.SortOrder > 0);

        queued.Status = TransferStatus.Failed;
        queued.Error = "disk full";
        queued.RetryCount = 1;
        queued.BytesDone = 12;
        queued.CurrentPath = @"D:\src\a.txt";
        await store.Transfers.UpdateAsync(queued);

        var incomplete = await store.Transfers.GetIncompleteAsync();
        var loaded = Assert.Single(incomplete);
        Assert.Equal(queued.Id, loaded.Id);
        Assert.Equal(TransferStatus.Failed, loaded.Status);
        Assert.Equal("disk full", loaded.Error);
        Assert.Equal(1, loaded.RetryCount);
        Assert.Equal(12, loaded.BytesDone);
        Assert.Equal(@"D:\src\a.txt", loaded.CurrentPath);

        queued.Status = TransferStatus.Done;
        queued.Error = null;
        queued.Dismissed = true;
        await store.Transfers.UpdateAsync(queued);

        Assert.Empty(await store.Transfers.GetIncompleteAsync());
        var history = await store.Transfers.GetHistoryAsync(10);
        var done = Assert.Single(history);
        Assert.Equal(TransferStatus.Done, done.Status);
        Assert.True(done.Dismissed);
    }

    [Fact]
    public async Task Schema_is_version_4()
    {
        await using var store = await Stores.Open();
        await store.Transfers.InsertAsync(new TransferJob
        {
            Op = TransferOp.Delete,
            SourcePath = @"C:\temp\a.txt",
            DestinationPath = "recycle",
            Status = TransferStatus.Queued,
            CreatedUtc = DateTimeOffset.UtcNow,
            AdditionalSources = [@"C:\temp\a.txt"]
        });
        var loaded = Assert.Single(await store.Transfers.GetIncompleteAsync());
        Assert.Equal(TransferOp.Delete, loaded.Op);
        Assert.Equal([@"C:\temp\a.txt"], loaded.AdditionalSources);
    }

    [Fact]
    public async Task Waiting_jobs_are_incomplete_not_history()
    {
        await using var store = await Stores.Open();
        var job = new TransferJob
        {
            Op = TransferOp.Move,
            SourcePath = @"\\nas\share\file.bin",
            DestinationPath = @"F:\backup\file.bin",
            Status = TransferStatus.Waiting,
            WaitReason = "Destination unavailable",
            CreatedUtc = DateTimeOffset.UtcNow
        };
        job.Id = await store.Transfers.InsertAsync(job);
        var incomplete = Assert.Single(await store.Transfers.GetIncompleteAsync());
        Assert.Equal(TransferStatus.Waiting, incomplete.Status);
        Assert.Equal("Destination unavailable", incomplete.WaitReason);
        Assert.Empty(await store.Transfers.GetHistoryAsync(10));
    }
}

public class FileRelationTests
{
    [Fact]
    public async Task Relations_roundtrip_and_normalize_entry_order()
    {
        await using var store = await Stores.Open();
        var source = await store.AddSourceAsync(@"C:\d");
        var a = await store.Entries.UpsertAsync(new IndexEntry
        {
            SourceId = source.Id,
            Name = "a.bin",
            NameNorm = "a.bin",
            PathRel = "a.bin",
            SizeBytes = 8,
            LastSeenUtc = DateTimeOffset.UtcNow
        });
        var b = await store.Entries.UpsertAsync(new IndexEntry
        {
            SourceId = source.Id,
            Name = "b.bin",
            NameNorm = "b.bin",
            PathRel = "b.bin",
            SizeBytes = 8,
            LastSeenUtc = DateTimeOffset.UtcNow
        });

        await store.Relations.UpsertAsync(new FileRelation
        {
            LeftEntryId = b,
            RightEntryId = a,
            Kind = FileRelationKind.IntentionalDuplicate,
            Origin = FileRelationOrigin.User,
            CreatedUtc = DateTimeOffset.UtcNow
        });

        var relation = Assert.Single(await store.Relations.GetAmongAsync([a, b]));
        Assert.Equal(Math.Min(a, b), relation.LeftEntryId);
        Assert.Equal(Math.Max(a, b), relation.RightEntryId);
        Assert.Equal(FileRelationKind.IntentionalDuplicate, relation.Kind);

        await store.Relations.DeleteAmongAsync([a, b], [FileRelationKind.IntentionalDuplicate]);
        Assert.Empty(await store.Relations.GetAmongAsync([a, b]));
    }

    [Fact]
    public async Task Rename_batch_roundtrip_and_mark_undone()
    {
        await using var store = await Stores.Open();
        var id = await store.RenameBatches.CreateAsync(
        [
            new RenameBatchItem(@"C:\a\old.txt", @"C:\a\new.txt", 0),
            new RenameBatchItem(@"C:\a\one.txt", @"C:\a\two.txt", 1)
        ]);
        var batch = await store.RenameBatches.GetLatestUndoableAsync();
        Assert.NotNull(batch);
        Assert.Equal(id, batch.Id);
        Assert.Equal(2, batch.Items.Count);
        Assert.Equal(@"C:\a\old.txt", batch.Items[0].OldPath);
        Assert.Equal(@"C:\a\two.txt", batch.Items[1].NewPath);
        await store.RenameBatches.MarkUndoneAsync(id);
        Assert.Null(await store.RenameBatches.GetLatestUndoableAsync());
    }

    [Fact]
    public async Task Sync_profile_roundtrip()
    {
        await using var store = await Stores.Open();
        var id = await store.SyncProfiles.UpsertAsync(new SyncProfile
        {
            Name = "Photos",
            SourcePath = @"C:\src",
            DestPath = @"D:\dst",
            Mode = SyncMode.CopyUpdate,
            Excludes = "*.tmp",
            AutoRun = true,
            SourceVolumeGuid = @"{src}",
            DestVolumeGuid = @"{dst}",
            CreatedUtc = DateTimeOffset.Parse("2024-06-01T12:00:00Z")
        });
        Assert.True(id > 0);
        var loaded = Assert.Single(await store.SyncProfiles.ListAsync());
        Assert.Equal(id, loaded.Id);
        Assert.Equal("Photos", loaded.Name);
        Assert.Equal(@"D:\dst", loaded.DestPath);
        Assert.Equal(SyncMode.CopyUpdate, loaded.Mode);
        Assert.Equal("*.tmp", loaded.Excludes);
        Assert.True(loaded.AutoRun);
        Assert.Equal(@"{dst}", loaded.DestVolumeGuid);

        loaded.Mode = SyncMode.Mirror;
        loaded.AutoRun = false;
        loaded.LastStatus = "Queued 1 copy";
        await store.SyncProfiles.UpsertAsync(loaded);
        var updated = await store.SyncProfiles.GetAsync(id);
        Assert.Equal(SyncMode.Mirror, updated!.Mode);
        Assert.False(updated.AutoRun);
        Assert.Equal("Queued 1 copy", updated.LastStatus);

        await store.SyncProfiles.DeleteAsync(id);
        Assert.Empty(await store.SyncProfiles.ListAsync());
    }

    [Fact]
    public async Task Operation_profile_roundtrip()
    {
        await using var store = await Stores.Open();
        var id = await store.OperationProfiles.UpsertAsync(new OperationProfile
        {
            Name = "Archive folder",
            SourcePath = @"C:\src",
            DestPath = @"D:\dst",
            RequireGitClean = true,
            DoCompress = true,
            ArchiveFormat = ArchiveFormat.SevenZip,
            DoCopy = false,
            DoRename = true,
            RenamePrefix = "x_",
            Excludes = ".git\nbin",
            AutoRun = false,
            SourceVolumeGuid = @"{src}",
            DestVolumeGuid = @"{dst}",
            IsBuiltIn = true,
            CreatedUtc = DateTimeOffset.Parse("2024-06-01T12:00:00Z")
        });
        Assert.True(id > 0);
        var loaded = Assert.Single(await store.OperationProfiles.ListAsync());
        Assert.Equal(id, loaded.Id);
        Assert.Equal("Archive folder", loaded.Name);
        Assert.True(loaded.RequireGitClean);
        Assert.True(loaded.DoCompress);
        Assert.Equal(ArchiveFormat.SevenZip, loaded.ArchiveFormat);
        Assert.True(loaded.DoRename);
        Assert.Equal("x_", loaded.RenamePrefix);
        Assert.Equal(".git\nbin", loaded.Excludes);
        Assert.True(loaded.IsBuiltIn);
        Assert.Equal(@"{dst}", loaded.DestVolumeGuid);

        loaded.DoCopy = true;
        loaded.LastStatus = "Queued 1 compress";
        await store.OperationProfiles.UpsertAsync(loaded);
        var updated = await store.OperationProfiles.GetAsync(id);
        Assert.True(updated!.DoCopy);
        Assert.Equal("Queued 1 compress", updated.LastStatus);

        await store.OperationProfiles.DeleteAsync(id);
        Assert.Empty(await store.OperationProfiles.ListAsync());
    }
}

public class IndexStoreLockTests
{
    [Fact]
    public async Task Second_writer_on_same_path_is_rejected()
    {
        var path = Path.Combine(Path.GetTempPath(), "ew-tests", Guid.NewGuid().ToString("N"), "index.db");
        await using var first = new SqliteIndexStore(path, NullLogger<SqliteIndexStore>.Instance);
        await first.OpenAsync();
        var second = new SqliteIndexStore(path, NullLogger<SqliteIndexStore>.Instance);
        var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => second.OpenAsync());
        Assert.Contains("already in use", ex.Message, StringComparison.OrdinalIgnoreCase);
        await first.DisposeAsync();
        await second.OpenAsync();
        await second.DisposeAsync();
    }

    [Fact]
    public void Mutex_name_is_stable_for_the_same_path()
    {
        var path = @"C:\Users\me\AppData\Local\ExplorerWorkbench\index.db";
        Assert.Equal(IndexStoreLock.MutexNameFor(path), IndexStoreLock.MutexNameFor(path));
        Assert.StartsWith(@"Local\ExplorerWorkbench-Index-", IndexStoreLock.MutexNameFor(path));
    }
}