using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Worker.Hub;
using ClaudeDo.Worker.Planning;
using ClaudeDo.Worker.Tests.Infrastructure;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.SignalR;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.Planning;

// Minimal fakes — avoids Moq dependency.
file sealed class FakeHttpContextAccessor : IHttpContextAccessor
{
    public HttpContext? HttpContext { get; set; }
}

file sealed class NullHubClients : IHubClients
{
    public IClientProxy All => NullClientProxy.Instance;
    public IClientProxy AllExcept(IReadOnlyList<string> excludedConnectionIds) => NullClientProxy.Instance;
    public IClientProxy Client(string connectionId) => NullClientProxy.Instance;
    public IClientProxy Clients(IReadOnlyList<string> connectionIds) => NullClientProxy.Instance;
    public IClientProxy Group(string groupName) => NullClientProxy.Instance;
    public IClientProxy GroupExcept(string groupName, IReadOnlyList<string> excludedConnectionIds) => NullClientProxy.Instance;
    public IClientProxy Groups(IReadOnlyList<string> groupNames) => NullClientProxy.Instance;
    public IClientProxy User(string userId) => NullClientProxy.Instance;
    public IClientProxy Users(IReadOnlyList<string> userIds) => NullClientProxy.Instance;
}

file sealed class NullClientProxy : IClientProxy
{
    public static readonly NullClientProxy Instance = new();
    public Task SendCoreAsync(string method, object?[] args, CancellationToken cancellationToken = default)
        => Task.CompletedTask;
}

file sealed class FakeHubContext : IHubContext<WorkerHub>
{
    public IHubClients Clients { get; } = new NullHubClients();
    public IGroupManager Groups => throw new NotImplementedException();
}

public sealed class PlanningMcpServiceTests : IDisposable
{
    private readonly DbFixture _db = new();
    private readonly ClaudeDoDbContext _ctx;
    private readonly TaskRepository _tasks;
    private readonly ListRepository _lists;

    public PlanningMcpServiceTests()
    {
        _ctx = _db.CreateContext();
        _tasks = new TaskRepository(_ctx);
        _lists = new ListRepository(_ctx);
    }

    public void Dispose() { _ctx.Dispose(); _db.Dispose(); }

    private PlanningMcpService BuildSut(string parentTaskId)
    {
        var httpContext = new DefaultHttpContext();
        httpContext.Items["PlanningContext"] = new PlanningMcpContext { ParentTaskId = parentTaskId };
        var accessor = new PlanningMcpContextAccessor(new FakeHttpContextAccessor { HttpContext = httpContext });
        var broadcaster = new HubBroadcaster(new FakeHubContext());
        return new PlanningMcpService(_tasks, accessor, broadcaster);
    }

    private async Task<TaskEntity> SeedPlanningParentAsync()
    {
        var listId = Guid.NewGuid().ToString();
        await _lists.AddAsync(new ListEntity { Id = listId, Name = "L", CreatedAt = DateTime.UtcNow });
        var parent = new TaskEntity
        {
            Id = Guid.NewGuid().ToString(),
            ListId = listId,
            Title = "p",
            Status = TaskStatus.Manual,
            CreatedAt = DateTime.UtcNow,
            CommitType = "chore",
        };
        await _tasks.AddAsync(parent);
        await _tasks.SetPlanningStartedAsync(parent.Id, "tok");
        return (await _tasks.GetByIdAsync(parent.Id))!;
    }

    [Fact]
    public async Task CreateChildTask_CreatesDraft()
    {
        var parent = await SeedPlanningParentAsync();
        var sut = BuildSut(parent.Id);

        var result = await sut.CreateChildTask("My child", "desc", null, null, CancellationToken.None);

        Assert.Equal("Draft", result.Status);
        var child = await _tasks.GetByIdAsync(result.TaskId);
        Assert.Equal("My child", child!.Title);
        Assert.Equal(TaskStatus.Draft, child.Status);
    }

    [Fact]
    public async Task ListChildTasks_ReturnsOnlyThisParentsChildren()
    {
        var parent = await SeedPlanningParentAsync();
        var other = await SeedPlanningParentAsync();

        await _tasks.CreateChildAsync(parent.Id, "mine", null, null, null);
        await _tasks.CreateChildAsync(other.Id, "theirs", null, null, null);

        var sut = BuildSut(parent.Id);
        var list = await sut.ListChildTasks(CancellationToken.None);
        Assert.Single(list);
        Assert.Equal("mine", list[0].Title);
    }

    [Fact]
    public async Task UpdateChildTask_NotAChild_Throws()
    {
        var parent = await SeedPlanningParentAsync();
        var other = await SeedPlanningParentAsync();
        var otherChild = await _tasks.CreateChildAsync(other.Id, "x", null, null, null);

        var sut = BuildSut(parent.Id);
        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.UpdateChildTask(otherChild.Id, "new", null, null, null, CancellationToken.None));
    }

    [Fact]
    public async Task UpdateChildTask_NotDraft_Throws()
    {
        var parent = await SeedPlanningParentAsync();
        var c = await _tasks.CreateChildAsync(parent.Id, "c", null, null, null);
        await _tasks.FinalizePlanningAsync(parent.Id, queueAgentTasks: false);

        var sut = BuildSut(parent.Id);
        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            sut.UpdateChildTask(c.Id, "new", null, null, null, CancellationToken.None));
    }

    [Fact]
    public async Task DeleteChildTask_RemovesDraft()
    {
        var parent = await SeedPlanningParentAsync();
        var c = await _tasks.CreateChildAsync(parent.Id, "c", null, null, null);

        var sut = BuildSut(parent.Id);
        await sut.DeleteChildTask(c.Id, CancellationToken.None);

        Assert.Null(await _tasks.GetByIdAsync(c.Id));
    }

    [Fact]
    public async Task UpdatePlanningTask_SetsTitleAndDescription()
    {
        var parent = await SeedPlanningParentAsync();

        var sut = BuildSut(parent.Id);
        await sut.UpdatePlanningTask("new title", "new desc", CancellationToken.None);

        var loaded = await _tasks.GetByIdAsync(parent.Id);
        Assert.Equal("new title", loaded!.Title);
        Assert.Equal("new desc", loaded.Description);
    }

    [Fact]
    public async Task Finalize_PromotesDraftsAndInvalidatesToken()
    {
        var parent = await SeedPlanningParentAsync();
        await _tasks.CreateChildAsync(parent.Id, "c1", null, null, null);
        await _tasks.CreateChildAsync(parent.Id, "c2", null, null, null);

        var sut = BuildSut(parent.Id);
        var count = await sut.Finalize(true, CancellationToken.None);

        Assert.Equal(2, count);
        var loaded = await _tasks.GetByIdAsync(parent.Id);
        Assert.Equal(TaskStatus.Planned, loaded!.Status);
        Assert.Null(loaded.PlanningSessionToken);
    }
}