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

namespace ClaudeDo.Worker.Tests;

public sealed class WaitingForChildrenLifecycleTests : IDisposable
{
    private readonly DbFixture _db = new();
    private readonly TestDbContextFactory _factory;
    private readonly TaskStateServiceBuilder.Built _built;

    public WaitingForChildrenLifecycleTests()
    {
        _factory = _db.CreateFactory();
        _built = TaskStateServiceBuilder.Build(_factory);
    }
    public void Dispose() => _db.Dispose();

    private async Task<string> SeedRunningStandaloneAsync()
    {
        using var ctx = _db.CreateContext();
        ctx.Lists.Add(new ListEntity { Id = "l1", Name = "L", CreatedAt = DateTime.UtcNow });
        ctx.Tasks.Add(new TaskEntity { Id = "p1", ListId = "l1", Title = "Parent",
            Status = TaskStatus.Running, CreatedAt = DateTime.UtcNow });
        await ctx.SaveChangesAsync();
        return "p1";
    }

    [Fact]
    public async Task SubmitForChildren_moves_running_task_to_WaitingForChildren()
    {
        var id = await SeedRunningStandaloneAsync();
        var result = await _built.State.SubmitForChildrenAsync(id, DateTime.UtcNow, "ran ok", default);
        Assert.True(result.Ok);
        using var ctx = _db.CreateContext();
        var t = await new TaskRepository(ctx).GetByIdAsync(id);
        Assert.Equal(TaskStatus.WaitingForChildren, t!.Status);
        Assert.Equal("ran ok", t.Result);
        Assert.NotNull(t.FinishedAt);
    }

    [Fact]
    public async Task SubmitForChildren_rejects_when_not_running()
    {
        var id = await SeedRunningStandaloneAsync();
        await _built.State.SubmitForChildrenAsync(id, DateTime.UtcNow, null, default);
        var second = await _built.State.SubmitForChildrenAsync(id, DateTime.UtcNow, null, default);
        Assert.False(second.Ok);
    }

    private async Task SeedParentWithChildrenAsync(string parentStatus, params TaskStatus[] childStatuses)
    {
        using var ctx = _db.CreateContext();
        if (!ctx.Lists.Any())
            ctx.Lists.Add(new ListEntity { Id = "l1", Name = "L", CreatedAt = DateTime.UtcNow });
        ctx.Tasks.Add(new TaskEntity { Id = "par", ListId = "l1", Title = "Parent",
            Status = Enum.Parse<TaskStatus>(parentStatus), Result = "parent ran", CreatedAt = DateTime.UtcNow });
        int i = 0;
        foreach (var cs in childStatuses)
            ctx.Tasks.Add(new TaskEntity { Id = $"c{i++}", ListId = "l1", Title = "Child",
                Status = cs, ParentTaskId = "par", CreatedAt = DateTime.UtcNow });
        await ctx.SaveChangesAsync();
    }

    [Fact]
    public async Task LastChildDone_advances_WaitingForChildren_parent_to_WaitingForReview()
    {
        await SeedParentWithChildrenAsync("WaitingForChildren", TaskStatus.Done, TaskStatus.Running);
        await _built.State.CompleteAsync("c1", DateTime.UtcNow, "child ok", default);
        using var ctx = _db.CreateContext();
        var parent = await new TaskRepository(ctx).GetByIdAsync("par");
        Assert.Equal(TaskStatus.WaitingForReview, parent!.Status);
    }

    [Fact]
    public async Task NonLastChild_leaves_parent_in_WaitingForChildren()
    {
        await SeedParentWithChildrenAsync("WaitingForChildren", TaskStatus.Running, TaskStatus.Idle);
        await _built.State.CompleteAsync("c0", DateTime.UtcNow, "ok", default);
        using var ctx = _db.CreateContext();
        var parent = await new TaskRepository(ctx).GetByIdAsync("par");
        Assert.Equal(TaskStatus.WaitingForChildren, parent!.Status);
    }

    [Fact]
    public async Task FailedChild_still_advances_parent_and_flags_failure()
    {
        await SeedParentWithChildrenAsync("WaitingForChildren", TaskStatus.Done, TaskStatus.Running);
        await _built.State.FailAsync("c1", DateTime.UtcNow, "boom", default);
        using var ctx = _db.CreateContext();
        var parent = await new TaskRepository(ctx).GetByIdAsync("par");
        Assert.Equal(TaskStatus.WaitingForReview, parent!.Status);
        Assert.Contains("1 failed", parent.Result!);
    }

    private async Task SeedParentChildPairAsync(PlanningPhase parentPhase)
    {
        using var ctx = _db.CreateContext();
        if (!ctx.Lists.Any())
            ctx.Lists.Add(new ListEntity { Id = "l1", Name = "L", CreatedAt = DateTime.UtcNow });
        ctx.Tasks.Add(new TaskEntity { Id = "par", ListId = "l1", Title = "Parent",
            Status = TaskStatus.WaitingForChildren, PlanningPhase = parentPhase, CreatedAt = DateTime.UtcNow });
        ctx.Tasks.Add(new TaskEntity { Id = "kid", ListId = "l1", Title = "Child",
            Status = TaskStatus.Idle, ParentTaskId = "par", CreatedAt = DateTime.UtcNow });
        await ctx.SaveChangesAsync();
    }

    [Fact]
    public async Task ImprovementChild_can_be_enqueued()
    {
        await SeedParentChildPairAsync(PlanningPhase.None);
        var result = await _built.State.EnqueueAsync("kid", default);
        Assert.True(result.Ok);
        using var ctx = _db.CreateContext();
        Assert.Equal(TaskStatus.Queued, (await new TaskRepository(ctx).GetByIdAsync("kid"))!.Status);
    }

    [Fact]
    public async Task PlanningDraftChild_cannot_be_enqueued()
    {
        await SeedParentChildPairAsync(PlanningPhase.Active);
        var result = await _built.State.EnqueueAsync("kid", default);
        Assert.False(result.Ok);
    }
}