using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Localization;
using ClaudeDo.Ui.Localization;
using ClaudeDo.Ui.Services;
using ClaudeDo.Ui.ViewModels.Islands;
using Microsoft.EntityFrameworkCore;

namespace ClaudeDo.Ui.Tests.ViewModels;

// UX-Struktur Paket C, C1: HasNoLinkedRepo drives the no-repo banner in ListsIslandView — true
// whenever no User list has a WorkingDir, recomputed after list load and after list CRUD /
// list-settings save (never persisted, no dismiss).
public class ListsIslandHasNoLinkedRepoTests : IDisposable
{
    private readonly string _dbPath;

    public ListsIslandHasNoLinkedRepoTests()
    {
        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_lists_norepo_test_{Guid.NewGuid():N}.db");
        using var ctx = NewContext();
        ctx.Database.EnsureCreated();

        var dir = AppContext.BaseDirectory;
        while (dir is not null && !Directory.Exists(Path.Combine(dir, "src", "ClaudeDo.Localization", "locales")))
            dir = Path.GetDirectoryName(dir);
        Loc.Current = new Localizer(
            LocaleStore.Load(Path.Combine(dir!, "src", "ClaudeDo.Localization", "locales")), "en");
    }

    public void Dispose()
    {
        try { File.Delete(_dbPath); } catch { }
        try { File.Delete(_dbPath + "-wal"); } catch { }
        try { File.Delete(_dbPath + "-shm"); } catch { }
    }

    private ClaudeDoDbContext NewContext()
    {
        var opts = new DbContextOptionsBuilder<ClaudeDoDbContext>()
            .UseSqlite($"Data Source={_dbPath}")
            .Options;
        return new ClaudeDoDbContext(opts);
    }

    private sealed class TestDbFactory : IDbContextFactory<ClaudeDoDbContext>
    {
        private readonly Func<ClaudeDoDbContext> _create;
        public TestDbFactory(Func<ClaudeDoDbContext> create) => _create = create;
        public ClaudeDoDbContext CreateDbContext() => _create();
    }

    private sealed class FakeWorker : StubWorkerClient
    {
        public override bool IsConnected => true;
    }

    private async Task<ListEntity> SeedListAsync(string id, string name, string? workingDir = null)
    {
        await using var db = NewContext();
        var entity = new ListEntity { Id = id, Name = name, WorkingDir = workingDir, CreatedAt = DateTime.UtcNow };
        db.Lists.Add(entity);
        await db.SaveChangesAsync();
        return entity;
    }

    [Fact]
    public async Task NoLists_HasNoLinkedRepo_IsTrue()
    {
        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext));
        await vm.LoadAsync();

        Assert.True(vm.HasNoLinkedRepo);
    }

    [Fact]
    public async Task OnlyNonUserSeedLists_HasNoLinkedRepo_IsTrue()
    {
        // "My Day"/"Important"/"Planned" are excluded from UserLists by name — they must not
        // count as a linked repo even if (hypothetically) one had a WorkingDir.
        await SeedListAsync("seed-my-day", "My Day", workingDir: @"C:\some\repo");

        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext));
        await vm.LoadAsync();

        Assert.Empty(vm.UserLists);
        Assert.True(vm.HasNoLinkedRepo);
    }

    [Fact]
    public async Task UserListWithoutWorkingDir_HasNoLinkedRepo_IsTrue()
    {
        await SeedListAsync("no-dir", "No Dir");

        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext));
        await vm.LoadAsync();

        Assert.True(vm.HasNoLinkedRepo);
    }

    [Fact]
    public async Task UserListWithWorkingDir_HasNoLinkedRepo_IsFalse()
    {
        await SeedListAsync("has-dir", "Has Dir", workingDir: @"C:\some\repo");

        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext));
        await vm.LoadAsync();

        Assert.False(vm.HasNoLinkedRepo);
    }

    [Fact]
    public async Task CreateListAsync_OnEmptyBoard_KeepsHasNoLinkedRepoTrue()
    {
        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext));
        await vm.LoadAsync();
        Assert.True(vm.HasNoLinkedRepo);

        // No Dialogs/service provider wired — CreateListAsync must still recompute the flag from
        // the newly-added (working-dir-less) row, not leave it stale.
        await vm.CreateListCommand.ExecuteAsync(null);

        Assert.True(vm.HasNoLinkedRepo);
    }

    [Fact]
    public async Task DeletingTheOnlyLinkedRepoList_ThenReloading_RecomputesToTrue()
    {
        var entity = await SeedListAsync("has-dir", "Has Dir", workingDir: @"C:\some\repo");

        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext));
        await vm.LoadAsync();
        Assert.False(vm.HasNoLinkedRepo);

        // List Settings' delete path removes the DB row, then the caller reloads (see
        // OpenListSettingsAsync/CreateListAsync: `if (vm.Deleted) await LoadAsync();`).
        await using (var db = NewContext())
        {
            db.Lists.Remove(db.Lists.Find(entity.Id)!);
            await db.SaveChangesAsync();
        }
        await vm.LoadAsync();

        Assert.True(vm.HasNoLinkedRepo);
    }

    [Fact]
    public async Task ListSettingsSave_LinkingWorkingDir_RecomputesToFalse()
    {
        var entity = await SeedListAsync("no-dir-yet", "No Dir Yet");

        var worker = new FakeWorker();
        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext), worker: worker);
        await vm.LoadAsync();
        Assert.True(vm.HasNoLinkedRepo);

        // Simulate a List Settings save linking a working dir — the worker broadcasts the same
        // ListUpdated event a real save triggers, driving RefreshRowAsync.
        await using (var db = NewContext())
        {
            var row = await db.Lists.FindAsync(entity.Id);
            row!.WorkingDir = @"C:\some\repo";
            await db.SaveChangesAsync();
        }
        worker.RaiseListUpdated(entity.Id);
        await Task.Delay(100);

        Assert.False(vm.HasNoLinkedRepo);
    }

    [Fact]
    public async Task ListSettingsSave_RemovingLastWorkingDir_RecomputesToTrue()
    {
        var entity = await SeedListAsync("has-dir", "Has Dir", workingDir: @"C:\some\repo");

        var worker = new FakeWorker();
        var vm = new ListsIslandViewModel(new TestDbFactory(NewContext), worker: worker);
        await vm.LoadAsync();
        Assert.False(vm.HasNoLinkedRepo);

        await using (var db = NewContext())
        {
            var row = await db.Lists.FindAsync(entity.Id);
            row!.WorkingDir = null;
            await db.SaveChangesAsync();
        }
        worker.RaiseListUpdated(entity.Id);
        await Task.Delay(100);

        Assert.True(vm.HasNoLinkedRepo);
    }
}