using System.Text.Json;
using ClawdDotNet.Core.Config;
using ClawdDotNet.Core.Organisation;
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>
/// #684: One board per unit. The bookkeeper's tasks do not show up for marketing, do not
/// hold up a marketing task as a "duplicate", and cannot be commented on from outside.
///
/// <code>
/// marketing (lead: marketing-lead)
/// └── amazon (lead: amazon-lead) · ads
/// accounting (lead: accounting-lead) · bookkeeper
/// ceo on the top level
/// </code>
/// </summary>
public sealed class UnitBoardTests : IDisposable
{
    private readonly string _directory;
    private readonly SqliteStorage _storage;
    private readonly SqliteTaskRepository _repo;
    private readonly TaskboardTool _tool = new();

    private readonly List<AgentConfig> _agents =
    [
        new() { AgentId = "ceo" },
        new() { AgentId = "marketing-lead", UnitId = "marketing" },
        new() { AgentId = "amazon-lead", UnitId = "amazon" },
        new() { AgentId = "ads", UnitId = "amazon" },
        new() { AgentId = "accounting-lead", UnitId = "accounting" },
        new() { AgentId = "bookkeeper", UnitId = "accounting" }
    ];

    private readonly List<UnitConfig> _units =
    [
        new() { Id = "marketing", Name = "Marketing", LeaderAgentId = "marketing-lead" },
        new() { Id = "amazon", Name = "Amazon", ParentId = "marketing", LeaderAgentId = "amazon-lead" },
        new() { Id = "accounting", Name = "Accounting", LeaderAgentId = "accounting-lead" }
    ];

    public UnitBoardTests()
    {
        _directory = Path.Combine(Path.GetTempPath(), "clawd-tests", Guid.NewGuid().ToString("N"));
        _storage = new SqliteStorage(Path.Combine(_directory, "state.db"));
        _repo = new SqliteTaskRepository(_storage);
    }

    public void Dispose()
    {
        SqliteStorage.ReleasePooledConnections(_directory);
        try { Directory.Delete(_directory, recursive: true); }
        catch { /* cleanup is secondary */ }
    }

    private string TasksDir => Path.Combine(_directory, "SharedWorkspace", "tasks");

    private async Task<ToolResult> Run(string agentId, object input, bool withUnits = true)
    {
        var context = new AgentToolContext(
            agentId, "inst", new Dictionary<string, object?>(), new NullStateStore(), NullLogger.Instance,
            CancellationToken.None, SharedWorkspacePath: Path.Combine(_directory, "SharedWorkspace"), Tasks: _repo)
        {
            Organisation = withUnits ? new OrgChart(_units, _agents) : new OrgChart([], _agents)
        };
        return await _tool.ExecuteAsync(JsonSerializer.SerializeToElement(input), context, CancellationToken.None);
    }

    private async Task<string> Create(string agentId, string title, string assignee = "@human")
    {
        var result = await Run(agentId, new { action = "task_create", title, assignee, force = true });
        result.Success.ShouldBeTrue(result.ErrorMessage);
        return result.Content.Split(' ', 4)[2]; // "Task created: <id> — …"
    }

    private async Task<string> List(string agentId, bool withUnits = true)
        => (await Run(agentId, new { action = "task_list" }, withUnits)).Content;

    [Fact]
    public async Task Each_unit_sees_its_own_board()
    {
        await Create("bookkeeper", "Book the invoices of September");
        await Create("ads", "Raise the bid for chairs");

        var marketing = await List("ads");
        var accounting = await List("bookkeeper");

        marketing.ShouldContain("Raise the bid");
        marketing.ShouldNotContain("invoices");
        accounting.ShouldContain("invoices");
        accounting.ShouldNotContain("Raise the bid");
    }

    [Fact]
    public async Task A_lead_also_sees_the_boards_of_the_units_below()
    {
        await Create("ads", "Raise the bid for chairs");
        await Create("bookkeeper", "Book the invoices of September");

        var lead = await List("marketing-lead");

        lead.ShouldContain("Raise the bid", Case.Sensitive, "amazon lies below marketing");
        lead.ShouldNotContain("invoices");
    }

    [Fact]
    public async Task A_task_handed_up_stays_in_view_of_whoever_handed_it_up()
    {
        // amazon-lead's lead is marketing-lead — the task lands on marketing's board …
        await Create("amazon-lead", "Approve the new budget", "@marketing-lead");

        (await List("marketing-lead")).ShouldContain("Approve the new budget");
        // … and the one who created it still sees it, although amazon's board does not hold it.
        (await List("amazon-lead")).ShouldContain("Approve the new budget");
        (await List("ads")).ShouldNotContain("Approve the new budget");
    }

    [Fact]
    public async Task A_similar_task_on_another_board_is_no_duplicate()
    {
        await Create("bookkeeper", "Check the supplier invoice");

        var result = await Run("ads", new { action = "task_create", title = "Check the supplier invoice" });

        result.Success.ShouldBeTrue(result.ErrorMessage);
        result.Content.ShouldNotContain("Observed again");
        (await Run("bookkeeper", new { action = "task_find", title = "Check the supplier invoice" })).Content
            .ShouldContain("1 open task(s)", Case.Sensitive, "and nothing was written onto the bookkeeper's task");
    }

    [Fact]
    public async Task A_task_on_another_board_cannot_be_changed_or_commented_on()
    {
        var id = await Create("bookkeeper", "Book the invoices of September");

        var update = await Run("ads", new { action = "task_update", id, status = "canceled" });
        var comment = await Run("ads", new { action = "task_comment", id, text = "not needed" });
        var unknown = await Run("ads", new { action = "task_comment", id = "t-does-not-exist", text = "x" });

        update.Success.ShouldBeFalse();
        comment.Success.ShouldBeFalse();
        comment.ErrorMessage!.Replace(id, "X").ShouldBe(unknown.ErrorMessage!.Replace("t-does-not-exist", "X"),
            "the same answer as for a task that does not exist");
        (await _repo.GetAsync(id, default))!.Status.ShouldBe(TaskItemStatus.Todo);
    }

    [Fact]
    public async Task An_open_task_moves_with_its_agent()
    {
        await Create("amazon-lead", "Prepare the listing", "@ads");
        (await List("bookkeeper")).ShouldNotContain("Prepare the listing");

        _agents.Single(a => a.AgentId == "ads").UnitId = "accounting";

        (await List("bookkeeper")).ShouldContain("Prepare the listing", Case.Sensitive, "the board follows the assignee");
    }

    [Fact]
    public async Task Without_units_there_is_one_board_for_everyone()
    {
        await Create("bookkeeper", "Book the invoices of September");

        (await List("ads", withUnits: false)).ShouldContain("invoices");
    }

    [Fact]
    public async Task The_creator_is_kept_in_the_file_and_survives_a_re_import()
    {
        var id = await Create("ads", "Raise the bid for chairs");
        var file = Directory.GetFiles(TasksDir).Single();
        File.ReadAllText(file).ShouldContain("created_by: ads");

        // A file written by hand without the field keeps what the database knows.
        File.WriteAllText(file, File.ReadAllText(file).Replace("created_by: ads\n", "").Replace("created_by: ads\r\n", ""));
        await new TaskboardService(_repo, TasksDir).ImportAllAsync(default);

        (await _repo.GetAsync(id, default))!.CreatedBy.ShouldBe("ads");
    }
}