using ClawdDotNet.App.Services;
using ClawdDotNet.Core.Activity;
using ClawdDotNet.Core.Config;
using ClawdDotNet.Core.Organisation;
using Shouldly;

namespace ClawdDotNet.App.Tests.Services;

/// <summary>
/// #711: The rules that decide what the team overview shows for an agent. Every state comes
/// from a recorded fact, never from a model's judgement.
/// </summary>
public sealed class TeamOverviewTests
{
    private static readonly DateTime Now = new(2027, 3, 10, 12, 0, 0, DateTimeKind.Utc);

    private static ActiveRun RunningFor(TimeSpan duration)
        => new("r", "worker", "task", null, null, Now - duration);

    [Fact]
    public void Nothing_running_and_a_good_last_run_is_idle()
        => TeamOverview.Classify([], 0, "Completed", TimeSpan.FromMinutes(1), Now).ShouldBe(TeamState.Idle);

    [Fact]
    public void An_agent_without_any_run_yet_is_idle()
        => TeamOverview.Classify([], 0, null, TimeSpan.Zero, Now).ShouldBe(TeamState.Idle);

    [Fact]
    public void A_run_in_progress_is_working()
        => TeamOverview.Classify([RunningFor(TimeSpan.FromMinutes(1))], 0, null, TimeSpan.FromMinutes(1), Now)
            .ShouldBe(TeamState.Working);

    [Fact]
    public void A_run_far_beyond_the_usual_duration_is_stuck()
        // Usually 2 minutes: three times that is 6, running for 7.
        => TeamOverview.Classify([RunningFor(TimeSpan.FromMinutes(7))], 0, null, TimeSpan.FromMinutes(2), Now)
            .ShouldBe(TeamState.Stuck);

    [Fact]
    public void Short_runs_get_a_floor_before_they_count_as_stuck()
        // Usually 20 seconds: three times is one minute, but the floor is five.
        => TeamOverview.Classify([RunningFor(TimeSpan.FromMinutes(3))], 0, null, TimeSpan.FromSeconds(20), Now)
            .ShouldBe(TeamState.Working);

    [Fact]
    public void Without_history_a_run_is_stuck_only_after_a_long_while()
    {
        TeamOverview.Classify([RunningFor(TimeSpan.FromMinutes(10))], 0, null, TimeSpan.Zero, Now).ShouldBe(TeamState.Working);
        TeamOverview.Classify([RunningFor(TimeSpan.FromMinutes(16))], 0, null, TimeSpan.Zero, Now).ShouldBe(TeamState.Stuck);
    }

    [Fact]
    public void An_open_approval_outranks_working()
        // What the human can do something about comes first.
        => TeamOverview.Classify([RunningFor(TimeSpan.FromMinutes(1))], 2, null, TimeSpan.FromMinutes(1), Now)
            .ShouldBe(TeamState.WaitingForApproval);

    [Fact]
    public void Stuck_outranks_an_open_approval()
        => TeamOverview.Classify([RunningFor(TimeSpan.FromHours(1))], 2, null, TimeSpan.FromMinutes(1), Now)
            .ShouldBe(TeamState.Stuck);

    [Theory]
    [InlineData("Failed")]
    [InlineData("LoopLimitExceeded")]
    [InlineData("TargetBusy")]
    public void A_failed_last_run_is_a_problem(string status)
        => TeamOverview.Classify([], 0, status, TimeSpan.Zero, Now).ShouldBe(TeamState.Problem);

    [Fact]
    public void A_refused_last_run_shows_the_exhausted_budget()
        => TeamOverview.Classify([], 0, "BudgetExceeded", TimeSpan.Zero, Now).ShouldBe(TeamState.BudgetExhausted);

    [Fact]
    public void A_new_run_hides_the_old_problem()
        // A new run is the attempt to get past it; the problem shows again if it fails.
        => TeamOverview.Classify([RunningFor(TimeSpan.FromMinutes(1))], 0, "Failed", TimeSpan.FromMinutes(1), Now)
            .ShouldBe(TeamState.Working);

    [Fact]
    public void A_cancelled_run_is_not_a_problem()
        // Cancelled means a human stopped it — that was a decision, not a fault.
        => TeamOverview.Classify([], 0, "Cancelled", TimeSpan.Zero, Now).ShouldBe(TeamState.Idle);

    // ═══════════════════ stage 1: units roll up ═══════════════════

    /// <summary>marketing (lead) › amazon (lead, ads) ; accounting (bookkeeper) ; ceo at the top.</summary>
    private static OrgChart Shop() => new(
        [
            new UnitConfig { Id = "marketing", Name = "Marketing", LeaderAgentId = "marketing-lead" },
            new UnitConfig { Id = "amazon", Name = "Amazon", ParentId = "marketing", LeaderAgentId = "amazon-lead" },
            new UnitConfig { Id = "accounting", Name = "Accounting" }
        ],
        [
            new AgentConfig { AgentId = "ceo" },
            new AgentConfig { AgentId = "marketing-lead", UnitId = "marketing" },
            new AgentConfig { AgentId = "amazon-lead", UnitId = "amazon" },
            new AgentConfig { AgentId = "ads", UnitId = "amazon" },
            new AgentConfig { AgentId = "bookkeeper", UnitId = "accounting" }
        ]);

    private static TeamMember Member(string id, string? unit, TeamState state, int approvals = 0)
        => new(id, id, "m", state, [], approvals, null, null, null, 0, unit);

    [Fact]
    public void A_problem_deep_down_shows_on_every_container_above_it()
    {
        var units = TeamOverview.RollUp(Shop(),
        [
            Member("ceo", null, TeamState.Working),
            Member("marketing-lead", "marketing", TeamState.Working),
            Member("amazon-lead", "amazon", TeamState.Idle),
            Member("ads", "amazon", TeamState.Problem),
            Member("bookkeeper", "accounting", TeamState.Idle)
        ]);

        var marketing = units.Single(u => u.Id == "marketing");
        marketing.Agents.ShouldBe(3, "its own lead and the two in amazon below");
        marketing.Worst.ShouldBe(TeamState.Problem);
        marketing.States[TeamState.Working].ShouldBe(1);
        marketing.States[TeamState.Problem].ShouldBe(1);

        units.Single(u => u.Id == "amazon").Worst.ShouldBe(TeamState.Problem);
        units.Single(u => u.Id == "accounting").Worst.ShouldBe(TeamState.Idle);
    }

    [Fact]
    public void Open_approvals_are_added_up_along_the_tree()
    {
        var units = TeamOverview.RollUp(Shop(),
        [
            Member("marketing-lead", "marketing", TeamState.WaitingForApproval, approvals: 1),
            Member("ads", "amazon", TeamState.WaitingForApproval, approvals: 2)
        ]);

        units.Single(u => u.Id == "marketing").PendingApprovals.ShouldBe(3);
        units.Single(u => u.Id == "amazon").PendingApprovals.ShouldBe(2);
    }

    [Fact]
    public void A_unit_knows_its_path_and_its_lead()
    {
        var amazon = TeamOverview.RollUp(Shop(), []).Single(u => u.Id == "amazon");

        amazon.Path.ShouldBe("Marketing / Amazon");
        amazon.LeaderAgentId.ShouldBe("amazon-lead");
        amazon.Agents.ShouldBe(0);
        amazon.Worst.ShouldBe(TeamState.Idle);
    }

    [Fact]
    public void Stuck_is_the_most_urgent_and_idle_the_least()
    {
        var byUrgency = Enum.GetValues<TeamState>().OrderByDescending(TeamOverview.Urgency).ToList();

        byUrgency.First().ShouldBe(TeamState.Stuck);
        byUrgency.Last().ShouldBe(TeamState.Idle);
        TeamOverview.Urgency(TeamState.Problem).ShouldBeGreaterThan(TeamOverview.Urgency(TeamState.WaitingForApproval));
    }

    [Fact]
    public void Without_units_there_is_nothing_to_roll_up()
        => TeamOverview.RollUp(new OrgChart([], [new AgentConfig { AgentId = "a" }]), [Member("a", null, TeamState.Problem)])
            .ShouldBeEmpty();

    // ─── #720: conflict hotspots ───

    [Fact]
    public void A_hotspot_is_shown_relative_to_the_agents_folder()
    {
        var agents = Path.Combine(Path.GetTempPath(), "inst", "Agents");
        var configured = new List<AgentConfig> { new() { AgentId = "a", SharedWorkspacePath = Path.Combine(agents, "SharedWorkspace") } };

        TeamOverview.Readable(Path.Combine(agents, "SharedWorkspaces", "articles", "list.csv"), configured)
            .ShouldBe("SharedWorkspaces/articles/list.csv");
        TeamOverview.Readable(Path.Combine(agents, "SharedWorkspace", "plan.md"), configured)
            .ShouldBe("SharedWorkspace/plan.md");
    }

    [Fact]
    public void A_path_elsewhere_stays_as_it_is()
    {
        var configured = new List<AgentConfig> { new() { AgentId = "a", SharedWorkspacePath = Path.Combine(Path.GetTempPath(), "inst", "Agents", "SharedWorkspace") } };
        var elsewhere = Path.Combine(Path.GetTempPath(), "other", "x.md");

        TeamOverview.Readable(elsewhere, configured).ShouldBe(elsewhere);
        TeamOverview.Readable(elsewhere, []).ShouldBe(elsewhere);
    }
}