using ClaudeDo.Data;
using ClaudeDo.Ui.Services;
using ClaudeDo.Ui.ViewModels;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace ClaudeDo.Ui.Tests.ViewModels;

public class MissionControlRunningOperationsTests : IDisposable
{
    private readonly string _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_mcops_{Guid.NewGuid():N}.db");

    public MissionControlRunningOperationsTests()
    {
        using var ctx = NewContext();
        ctx.Database.EnsureCreated();
    }

    public void Dispose()
    {
        foreach (var suffix in new[] { "", "-wal", "-shm" })
            try { File.Delete(_dbPath + suffix); } catch { }
    }

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

    private sealed class FakeWorker : StubWorkerClient
    {
        public IReadOnlyList<RunningOperationDto> Snapshot { get; set; } = Array.Empty<RunningOperationDto>();
        /// <summary>When set, the snapshot call completes only once this source is resolved.</summary>
        public TaskCompletionSource? Gate { get; set; }
        public override async Task<IReadOnlyList<RunningOperationDto>> GetActiveOperationsAsync()
        {
            if (Gate is not null) await Gate.Task;
            return Snapshot;
        }
    }

    private static RunningOperationDto Op(string id, string kind, int? number, string title, string? listId = null) =>
        new(id, kind, number is null ? null : "t-" + id, number, listId, title, DateTime.UtcNow.AddSeconds(-5));

    private MissionControlViewModel BuildVm(FakeWorker worker) =>
        new(new TestDbFactory(NewContext), worker, new UsagePillViewModel(worker));

    [Fact]
    public async Task Snapshot_LoadsRunningOperations_AndShowsActivity()
    {
        var worker = new FakeWorker
        {
            Snapshot = new[]
            {
                Op("a", OperationKinds.VerifyMerge, 12, "Fix login"),
                Op("b", OperationKinds.VerifyBatch, null, "My list", listId: "l1"),
            },
        };
        var vm = BuildVm(worker);

        await vm.RefreshOperationsAsync();

        Assert.Equal(new[] { "#12 Fix login", "My list" }, vm.RunningOperations.Select(r => r.Subject));
        Assert.True(vm.HasRunningOperations);
        Assert.True(vm.HasActivity);
    }

    [Fact]
    public async Task StartedAndEndedEvents_UpdateTheList()
    {
        var worker = new FakeWorker();
        var vm = BuildVm(worker);
        await vm.RefreshOperationsAsync();
        Assert.False(vm.HasRunningOperations);

        worker.RaiseOperationStarted(Op("a", OperationKinds.Merging, 3, "Task"));
        worker.RaiseOperationStarted(Op("a", OperationKinds.Merging, 3, "Task")); // duplicate ignored
        worker.RaiseOperationStarted(Op("b", OperationKinds.Rebasing, 4, "Other"));
        Assert.Equal(2, vm.RunningOperations.Count);

        worker.RaiseOperationEnded("a");
        Assert.Equal("b", Assert.Single(vm.RunningOperations).Id);

        worker.RaiseOperationEnded("unknown");
        worker.RaiseOperationEnded("b");
        Assert.False(vm.HasRunningOperations);
    }

    [Fact]
    public async Task EndedDuringPendingSnapshot_DoesNotReappear()
    {
        var gate = new TaskCompletionSource();
        var worker = new FakeWorker { Snapshot = new[] { Op("a", OperationKinds.Merging, 1, "Task") }, Gate = gate };
        var vm = BuildVm(worker);

        var refresh = vm.RefreshOperationsAsync();
        worker.RaiseOperationEnded("a");
        gate.SetResult();
        await refresh;

        Assert.Empty(vm.RunningOperations);
        Assert.False(vm.HasRunningOperations);
    }

    [Fact]
    public async Task EndedBeforeStarted_LeavesNoRow()
    {
        var worker = new FakeWorker();
        var vm = BuildVm(worker);
        await vm.RefreshOperationsAsync();

        worker.RaiseOperationEnded("a");
        worker.RaiseOperationStarted(Op("a", OperationKinds.Merging, 1, "Task"));

        Assert.Empty(vm.RunningOperations);
    }

    [Fact]
    public async Task ConnectionRestored_ReplacesListWithFreshSnapshot()
    {
        var worker = new FakeWorker { Snapshot = new[] { Op("a", OperationKinds.Merging, 1, "Old") } };
        var vm = BuildVm(worker);
        await vm.RefreshOperationsAsync();

        worker.Snapshot = new[] { Op("c", OperationKinds.CreatingWorktree, 2, "New") };
        await vm.RefreshOperationsAsync();

        Assert.Equal("c", Assert.Single(vm.RunningOperations).Id);
    }

    [Fact]
    public async Task TickOperations_UpdatesElapsed()
    {
        var worker = new FakeWorker();
        var vm = BuildVm(worker);
        var started = new DateTime(2026, 10, 1, 8, 0, 0, DateTimeKind.Utc);
        worker.RaiseOperationStarted(new RunningOperationDto("a", OperationKinds.VerifyMerge, "t", 1, null, "T", started));

        vm.TickOperations(started.AddSeconds(75));

        Assert.Equal("01:15", vm.RunningOperations.Single().Elapsed);
        await Task.CompletedTask;
    }
}