using ClaudeDo.Data;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Worker.Planning;
using ClaudeDo.Worker.Tests.Infrastructure;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.Planning;

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

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

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

    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))!;
    }

    private static PlanningMcpContext Ctx(string parentId) => new() { ParentTaskId = parentId };

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

        var result = await _sut.CreateChildTask(Ctx(parent.Id), "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 list = await _sut.ListChildTasks(Ctx(parent.Id), 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);

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            _sut.UpdateChildTask(Ctx(parent.Id), 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);

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            _sut.UpdateChildTask(Ctx(parent.Id), 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);

        await _sut.DeleteChildTask(Ctx(parent.Id), c.Id, CancellationToken.None);

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

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

        await _sut.UpdatePlanningTask(Ctx(parent.Id), "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 count = await _sut.Finalize(Ctx(parent.Id), true, CancellationToken.None);

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