using ClawdDotNet.Core.Config;
using ClawdDotNet.Core.Organisation;
using ClawdDotNet.Core.Tests.Infrastructure;
using ClawdDotNet.Core.Tools;
using Shouldly;

namespace ClawdDotNet.Core.Tests.Organisation;

/// <summary>
/// #683: The address book is enforced by the engine — not merely described in a prompt that
/// a model may or may not follow. And every agent is told where it stands.
/// </summary>
public sealed class AddressBookEnforcementTests
{
    /// <summary>marketing (lead: marketing-lead) › amazon (lead: amazon-lead, ads); accounting: bookkeeper.</summary>
    private static (EngineFixture Fixture, List<UnitConfig> Units) Shop()
    {
        var fixture = new EngineFixture();
        var units = new List<UnitConfig>
        {
            new() { Id = "marketing", Name = "Marketing", LeaderAgentId = "marketing-lead" },
            new() { Id = "amazon", Name = "Amazon", ParentId = "marketing", LeaderAgentId = "amazon-lead", Goal = "Sell on Amazon." },
            new() { Id = "accounting", Name = "Accounting" }
        };

        foreach (var (id, unit) in new[]
                 {
                     ("marketing-lead", "marketing"), ("amazon-lead", "amazon"), ("ads", "amazon"), ("bookkeeper", "accounting")
                 })
            fixture.AddAgent(id).UnitId = unit;

        fixture.Engine.OrganisationProvider = () => new OrgChart(units, fixture.Agents);
        return (fixture, units);
    }

    // ═══════════════════ messages and spawns ═══════════════════

    [Fact]
    public async Task A_message_outside_the_address_book_is_refused_with_the_way_that_is_open()
    {
        var (shop, _) = Shop();

        var result = await shop.Engine.SendMessageAsync("ads", "bookkeeper", "Kannst du zahlen?", "inst", null, default);

        result.Delivered.ShouldBeFalse();
        result.Error.ShouldNotBeNull().ShouldContain("not in your address book");
        result.Error.ShouldContain("amazon-lead", Case.Sensitive, "the way that is open: the own lead");
        shop.Client.CallCount.ShouldBe(0, "refused before any model call");
    }

    [Fact]
    public async Task A_message_to_the_own_lead_goes_through()
    {
        var (shop, _) = Shop();
        shop.Client.RespondsWithText("Verstanden.");

        var result = await shop.Engine.SendMessageAsync("ads", "amazon-lead", "Frage", "inst", null, default);

        result.Delivered.ShouldBeTrue(result.Error);
    }

    [Fact]
    public async Task A_spawn_is_held_to_the_same_address_book()
    {
        var (shop, _) = Shop();

        var result = await shop.Engine.SpawnAgentAsync("ads", "bookkeeper", "Buche das", "inst", null, default);

        result.Started.ShouldBeFalse();
        result.Error.ShouldNotBeNull().ShouldContain("not in your address book");
    }

    [Fact]
    public void The_agent_list_shows_only_the_address_book()
    {
        var (shop, _) = Shop();

        shop.Engine.ListAgents("ads").Select(a => a.AgentId).ShouldBe(["amazon-lead"]);
    }

    [Fact]
    public void Without_units_the_agent_list_is_unchanged()
    {
        var fixture = new EngineFixture();
        fixture.AddAgent("a");
        fixture.AddAgent("b");
        fixture.AddAgent("c");

        fixture.Engine.ListAgents("a").Select(x => x.AgentId).ShouldBe(["b", "c"], ignoreOrder: true);
    }

    // ═══════════════════ delegation depth ═══════════════════

    [Fact]
    public async Task The_delegation_limit_follows_the_depth_of_the_tree()
    {
        // Five levels deep: with the old fixed limit of 3, the bottom could not be reached.
        var fixture = new EngineFixture();
        var units = new List<UnitConfig>();
        string? parent = null;
        for (var level = 1; level <= 5; level++)
        {
            units.Add(new UnitConfig { Id = $"u{level}", Name = $"U{level}", ParentId = parent, LeaderAgentId = $"lead{level}" });
            fixture.AddAgent($"lead{level}").UnitId = $"u{level}";
            parent = $"u{level}";
        }
        fixture.Engine.OrganisationProvider = () => new OrgChart(units, fixture.Agents);
        fixture.Client.RespondsWithText("ok");

        // lead1 → lead2 → lead3 → lead4 → lead5: the fourth hand-over.
        var chain = DelegationChain.Root("lead1").Append("lead2").Append("lead3").Append("lead4");
        var result = await fixture.Engine.SendMessageAsync("lead4", "lead5", "weiter", "inst", chain, default);

        result.Delivered.ShouldBeTrue(result.Error);
    }

    // ═══════════════════ the organisation section ═══════════════════

    [Fact]
    public async Task Every_run_tells_the_agent_its_unit_and_its_lead()
    {
        var (shop, _) = Shop();
        shop.Client.RespondsWithText("ok");

        await shop.Engine.RunAsync(shop.Agents.First(a => a.AgentId == "ads"), "Los", "inst", default);

        var system = shop.Client.ReceivedRequests[0].Messages[0].Content!;
        system.ShouldContain(OrgBriefing.Heading);
        system.ShouldContain("\"Amazon\" (Marketing / Amazon)");
        system.ShouldContain("Your lead: amazon-lead");
        system.ShouldContain("Goal of your unit: Sell on Amazon.");
        system.ShouldNotContain("bookkeeper", Case.Sensitive, "not in the address book — not in the prompt either");
    }

    [Fact]
    public async Task A_move_reaches_a_running_chat_context()
    {
        var (shop, units) = Shop();
        var ads = shop.Agents.First(a => a.AgentId == "ads");
        shop.Client.RespondsWithText("ok").RespondsWithText("ok");

        await shop.Engine.ChatAsync(ads, "Hallo", "inst", default);
        shop.Client.ReceivedRequests[0].Messages[0].Content!.ShouldContain("Your lead: amazon-lead");

        // Moved to accounting, which has no lead: the next run knows it.
        ads.UnitId = "accounting";
        ads.UnitSinceUtc = DateTime.UtcNow;
        await shop.Engine.ChatAsync(ads, "Und jetzt?", "inst", default);

        var system = shop.Client.ReceivedRequests[1].Messages[0].Content!;
        system.ShouldContain("\"Accounting\"");
        system.ShouldContain("this is recent");
        system.ShouldContain("There is no lead agent above you");
        system.ShouldStartWith("Du bist ads.", Case.Sensitive, "the rest of the prompt is untouched");
    }

    [Fact]
    public async Task Without_units_the_prompt_has_no_organisation_section()
    {
        var fixture = new EngineFixture();
        var agent = fixture.AddAgent("solo");
        fixture.Client.RespondsWithText("ok");

        await fixture.Engine.RunAsync(agent, "Los", "inst", default);

        fixture.Client.ReceivedRequests[0].Messages[0].Content!.ShouldNotContain(OrgBriefing.Heading);
    }

    [Fact]
    public void The_section_is_replaced_not_stacked()
    {
        var once = OrgBriefing.WithSection("Base.", "# Organisation\nA");
        var twice = OrgBriefing.WithSection(once, "# Organisation\nB");

        twice.ShouldBe("Base.\n\n# Organisation\nB");
        OrgBriefing.WithSection(twice, null).ShouldBe("Base.");
    }
}