using ClaudeDo.Data;
using ClaudeDo.Data.Git;
using ClaudeDo.Data.Models;
using ClaudeDo.Worker.Hub;
using ClaudeDo.Worker.Lifecycle;
using ClaudeDo.Worker.Planning;
using ClaudeDo.Worker.Tests.Infrastructure;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.Logging.Abstractions;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.Planning;

file sealed class TreeMergeRecordingHubClients : IHubClients
{
    public TreeMergeRecordingClientProxy Proxy { get; } = new();
    public IClientProxy All => Proxy;
    public IClientProxy AllExcept(IReadOnlyList<string> excludedConnectionIds) => Proxy;
    public IClientProxy Client(string connectionId) => Proxy;
    public IClientProxy Clients(IReadOnlyList<string> connectionIds) => Proxy;
    public IClientProxy Group(string groupName) => Proxy;
    public IClientProxy GroupExcept(string groupName, IReadOnlyList<string> excludedConnectionIds) => Proxy;
    public IClientProxy Groups(IReadOnlyList<string> groupNames) => Proxy;
    public IClientProxy User(string userId) => Proxy;
    public IClientProxy Users(IReadOnlyList<string> userIds) => Proxy;
}

file sealed class TreeMergeRecordingClientProxy : IClientProxy
{
    public List<(string Method, object?[] Args)> Calls { get; } = new();
    public Task SendCoreAsync(string method, object?[] args, CancellationToken cancellationToken = default)
    {
        Calls.Add((method, args));
        return Task.CompletedTask;
    }
}

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

public sealed class TreeMergeTests : IDisposable
{
    private readonly List<DbFixture> _dbs = new();
    private readonly List<GitRepoFixture> _repos = new();
    private readonly List<(string repoDir, string wtPath)> _wtCleanups = new();

    private DbFixture NewDb() { var d = new DbFixture(); _dbs.Add(d); return d; }
    private GitRepoFixture NewRepo() { var r = new GitRepoFixture(); _repos.Add(r); return r; }

    public void Dispose()
    {
        foreach (var (repo, wt) in _wtCleanups)
            try { GitRepoFixture.RunGit(repo, "worktree", "remove", "--force", wt); } catch { }
        foreach (var d in _dbs) try { d.Dispose(); } catch { }
        foreach (var r in _repos) try { r.Dispose(); } catch { }
    }

    [Fact]
    public async Task ImprovementParent_foldsOwnBranch_thenChild_andMarksDone()
    {
        if (!GitRepoFixture.IsGitAvailable()) { Assert.True(true, "git not available"); return; }
        var db = NewDb();
        var repo = NewRepo();
        GitRepoFixture.RunGit(repo.RepoDir, "branch", "-m", "main");

        var listId = Guid.NewGuid().ToString();
        var parentId = Guid.NewGuid().ToString();
        var childId = Guid.NewGuid().ToString();

        using (var ctx = db.CreateContext())
        {
            ctx.Lists.Add(new ListEntity { Id = listId, Name = "L", WorkingDir = repo.RepoDir, CreatedAt = DateTime.UtcNow });
            ctx.Tasks.Add(new TaskEntity { Id = parentId, ListId = listId, Title = "Parent",
                Status = TaskStatus.WaitingForReview, PlanningPhase = PlanningPhase.None, SortOrder = 0, CreatedAt = DateTime.UtcNow });
            ctx.Tasks.Add(new TaskEntity { Id = childId, ListId = listId, Title = "Child",
                Status = TaskStatus.Done, ParentTaskId = parentId, SortOrder = 1, CreatedAt = DateTime.UtcNow });
            await ctx.SaveChangesAsync();

            var parentWt = SeedWorktree(repo, parentId, repo.BaseCommit, "parent.txt", "parent work");
            var childWt = SeedWorktree(repo, childId, parentWt.head, "child.txt", "child work");
            ctx.Worktrees.Add(MakeRow(parentId, parentWt));
            ctx.Worktrees.Add(MakeRow(childId, childWt));
            await ctx.SaveChangesAsync();
        }

        var (orch, calls) = BuildOrchestrator(db);
        await orch.StartAsync(parentId, "main", CancellationToken.None);

        using var verify = db.CreateContext();
        Assert.Equal(TaskStatus.Done, verify.Tasks.Single(t => t.Id == parentId).Status);
        Assert.Equal(WorktreeState.Merged, verify.Worktrees.Single(w => w.TaskId == parentId).State);
        Assert.Equal(WorktreeState.Merged, verify.Worktrees.Single(w => w.TaskId == childId).State);
        Assert.Contains(calls, c => c.Method == "PlanningSubtaskMerged" && (string)c.Args[1]! == parentId);
        Assert.Contains(calls, c => c.Method == "PlanningSubtaskMerged" && (string)c.Args[1]! == childId);
        Assert.Contains(calls, c => c.Method == "PlanningCompleted");
        Assert.True(File.Exists(Path.Combine(repo.RepoDir, "parent.txt")));
        Assert.True(File.Exists(Path.Combine(repo.RepoDir, "child.txt")));
    }

    private (string path, string branch, string head) SeedWorktree(
        GitRepoFixture repo, string taskId, string baseCommit, string file, string content)
    {
        var wtPath = Path.Combine(Path.GetTempPath(), $"wt_{Guid.NewGuid():N}");
        _wtCleanups.Add((repo.RepoDir, wtPath));
        var branch = $"claudedo/{taskId.Replace("-", "")}";
        GitRepoFixture.RunGit(repo.RepoDir, "worktree", "add", "-b", branch, wtPath, baseCommit);
        File.WriteAllText(Path.Combine(wtPath, file), content);
        GitRepoFixture.RunGit(wtPath, "add", file);
        GitRepoFixture.RunGit(wtPath, "commit", "-m", $"add {file}");
        var head = GitRepoFixture.RunGit(wtPath, "rev-parse", "HEAD").Trim();
        return (wtPath, branch, head);
    }

    private static WorktreeEntity MakeRow(string taskId, (string path, string branch, string head) wt)
        => new() { TaskId = taskId, Path = wt.path, BranchName = wt.branch, BaseCommit = "x",
                   HeadCommit = wt.head, State = WorktreeState.Active, CreatedAt = DateTime.UtcNow };

    private (PlanningMergeOrchestrator orch, List<(string Method, object?[] Args)> calls) BuildOrchestrator(DbFixture db)
    {
        var fakeHub = new TreeMergeFakeHubContext();
        var spy = fakeHub.RecordingClients.Proxy;
        var broadcaster = new HubBroadcaster(fakeHub);
        var git = new GitService();
        var factory = db.CreateFactory();
        var built = TaskStateServiceBuilder.Build(factory);
        var merge = new TaskMergeService(
            factory, git, broadcaster,
            built.State,
            NullLogger<TaskMergeService>.Instance);
        var aggregator = new PlanningAggregator(
            factory, git,
            NullLogger<PlanningAggregator>.Instance);
        var orch = new PlanningMergeOrchestrator(
            factory, merge, aggregator, broadcaster, git,
            built.State,
            NullLogger<PlanningMergeOrchestrator>.Instance);
        return (orch, spy.Calls);
    }
}