using System.Text.Json;
using ClawdDotNet.Core.State;
using ClawdDotNet.Core.Storage;
using ClawdDotNet.Core.Tasks;
using ClawdDotNet.Core.Tools;
using ClawdDotNet.Tools.Taskboard;
using ClawdDotNet.Tools.Tests.FileRW;
using Microsoft.Extensions.Logging.Abstractions;
using Shouldly;

namespace ClawdDotNet.Tools.Tests.Taskboard;

/// <summary>
/// task_find and the duplicate brake (#674).
///
/// Occasion from test operation: the operations check runs every three hours and created
/// again at every run what was already open from the previous one — over thirty tasks
/// for @human, among them the same price finding six times.
/// </summary>
public sealed class DuplicateTests : IDisposable
{
    private readonly string _verzeichnis;
    private readonly SqliteStorage _storage;
    private readonly SqliteTaskRepository _repo;
    private readonly TaskboardService _board;
    private readonly TaskboardTool _tool = new();

    public DuplicateTests()
    {
        _verzeichnis = Path.Combine(Path.GetTempPath(), "clawd-tests", Guid.NewGuid().ToString("N"));
        _storage = new SqliteStorage(Path.Combine(_verzeichnis, "state.db"));
        _repo = new SqliteTaskRepository(_storage);
        _board = new TaskboardService(_repo, Path.Combine(_verzeichnis, "SharedWorkspace", "tasks"));
    }

    public void Dispose()
    {
        ClawdDotNet.Core.Storage.SqliteStorage.ReleasePooledConnections(_verzeichnis);
        try { Directory.Delete(_verzeichnis, recursive: true); }
        catch { /* Cleaning up is secondary */ }
    }

    private AgentToolContext Context() => new(
        "hausmeister", "inst",
        new Dictionary<string, object?>(),
        new NullStateStore(),
        NullLogger.Instance,
        CancellationToken.None,
        SharedWorkspacePath: Path.Combine(_verzeichnis, "SharedWorkspace"),
        Tasks: _repo);

    private Task<ToolResult> Run(string json)
        => _tool.ExecuteAsync(JsonDocument.Parse(json).RootElement, Context(), CancellationToken.None);

    private Task<TaskItem> Create(string title, TaskItemStatus status = TaskItemStatus.Todo)
        => _board.CreateAsync(new TaskItem { Title = title, Status = status, Assignee = "@human", Body = "Beobachtet." }, default);

    // ─── task_find ───

    [Fact]
    public async Task Without_matches_the_answer_says_creating_is_allowed()
    {
        await Create("Betriebsluecke: Wetter Warnungen veraltet");

        var result = await Run("""{"action":"task_find","title":"Betriebsluecke: Eur Kurse nicht aktuell"}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
        result.Content.ShouldContain("No open task resembles");
        result.Content.ShouldContain("task_create");
    }

    [Fact]
    public async Task The_same_finding_is_found_with_id_age_and_classification()
    {
        var present = await Create("Betriebsluecke: Eur Kurse nicht aktuell");

        var result = await Run("""{"action":"task_find","title":"Betriebsluecke: Kurse EUR nicht aktuell"}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
        result.Content.ShouldContain(present.Id);
        result.Content.ShouldContain("same issue");
        result.Content.ShouldContain("open since");
        result.Content.ShouldContain("task_comment", Case.Sensitive, "der Agent soll ergaenzen, nicht neu anlegen");
    }

    [Fact]
    public async Task Without_title_the_tool_asks()
    {
        var result = await Run("""{"action":"task_find"}""");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("'title' is required");
    }

    // ─── the brake when creating ───

    [Fact]
    public async Task A_second_identical_task_is_not_created()
    {
        var first = await Create("Betriebsluecke: Eur Kurse nicht aktuell");

        var result = await Run("""{"action":"task_create","title":"Betriebsluecke: Kurse EUR nicht aktuell","assignee":"@human"}""");

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain(first.Id);
        result.ErrorMessage.ShouldContain("recorded");

        (await _board.ListAsync(new TaskQuery { Limit = 50 }, default)).Count
            .ShouldBe(1, "es bleibt bei der einen Aufgabe");
    }

    [Fact]
    public async Task The_recurrence_is_then_on_the_existing_task()
    {
        var first = await Create("Betriebsluecke: Nachrichten fehlen");

        await Run("""{"action":"task_create","title":"Betriebsluecke: Nachrichten fehlen","assignee":"@human"}""");

        var datei = await File.ReadAllTextAsync(Path.Combine(_board.TasksDirectory, (await _board.GetAsync(first.Id, default))!.FileName));
        datei.ShouldContain("Observed again");
        datei.ShouldContain("hausmeister", Case.Insensitive);
    }

    [Fact]
    public async Task A_different_matter_comes_through_normally()
    {
        await Create("Betriebsluecke: Eur Kurse nicht aktuell");

        var result = await Run("""{"action":"task_create","title":"Betriebsluecke: Wetter Warnungen stand.md veraltet","assignee":"@human"}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
        (await _board.ListAsync(new TaskQuery { Limit = 50 }, default)).Count.ShouldBe(2);
    }

    [Fact]
    public async Task With_force_the_agent_may_create_anyway()
    {
        await Create("Betriebsluecke: Eur Kurse nicht aktuell");

        var result = await Run("""{"action":"task_create","title":"Betriebsluecke: Eur Kurse nicht aktuell","assignee":"@human","force":true}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
        (await _board.ListAsync(new TaskQuery { Limit = 50 }, default)).Count.ShouldBe(2);
    }

    [Fact]
    public async Task The_duplicate_is_found_even_behind_500_other_tasks()
    {
        // #716: The search read ListAsync with a limit of 500, sorted by priority. An old
        // task with low priority thus fell out of sight as soon as the board grew.
        var old = await _board.CreateAsync(new TaskItem
        {
            Title = "Betriebsluecke: Eur Kurse nicht aktuell", Assignee = "@human", Priority = 1
        }, default);
        for (var i = 0; i < 510; i++)
            await _repo.UpsertAsync(new TaskItem { Id = $"t-fill-{i}", Title = $"Anderes Thema {i}", Priority = 5 }, default);

        var result = await Run("""{"action":"task_create","title":"Betriebsluecke: Kurse EUR nicht aktuell","assignee":"@human"}""");

        result.Success.ShouldBeFalse("die alte Aufgabe meint dasselbe");
        result.ErrorMessage.ShouldNotBeNull().ShouldContain(old.Id);
    }

    [Fact]
    public async Task A_done_task_does_not_block_the_next_finding()
    {
        await Create("Betriebsluecke: Eur Kurse nicht aktuell", TaskItemStatus.Done);

        var result = await Run("""{"action":"task_create","title":"Betriebsluecke: Eur Kurse nicht aktuell","assignee":"@human"}""");

        result.Success.ShouldBeTrue(result.ErrorMessage);
    }
}