//! Integration tests for tell escalation on triangle activation (#589, D-024 axis 9).
//!
//! Covers:
//! - D-027 criterion 4: RoutineDeviation tell must be observable after activation
//! - D-024 axis 9: tell system is a simulation output, not authored content
//! - #589: escalate_tells_on_activation system inserts RoutineDeviation on triangle NPCs
//!
//! Test structure:
//! - Layer 1 (pure): verify RoutineDeviation dominates all other tells (already
//!   covered by unit tests in tell_state.rs, regression guards here)
//! - Layer 2 (ECS world): verify activation event → RoutineDeviation insertion (pending #589)
//! - Layer 2 (ECS world): verify expired RoutineDeviation is removed (pending #589)
//!
//! Pending tests are marked #[ignore] — they compile against the current API but
//! will fail until escalate_tells_on_activation is registered in StorytellerPlugin.

use bevy_app::prelude::*;
use bevy_ecs::prelude::*;
use settled_reach_server::{
    npc::mood::MoodState,
    npc::{
        tell_state::{DerivedTellState, TellCategory},
        Contentment, DeviationTrigger, Npc, RoutineDeviation, Secret, SecretSeverity,
        ToleranceThreshold,
    },
    simulation::tier::ActiveSim,
};

// ---------------------------------------------------------------------------
// Layer 1 regression: RoutineDeviation component presence → RoutineDeviation tell
// (These pass today; guard against future tell priority regressions)
// ---------------------------------------------------------------------------

/// Build a minimal ECS world with one NPC and run derive_tell_state.
fn make_tell_world_with_deviation(deviation: Option<RoutineDeviation>) -> (World, Entity) {
    let mut world = World::new();
    let mut npc = world.spawn((
        Npc,
        ActiveSim,
        Secret {
            description: "minor".into(),
            severity: SecretSeverity::Minor,
            known_by: vec![],
        },
        ToleranceThreshold {
            current_stress: 0,
            threshold: 50,
        },
        Contentment { level: 0 },
        MoodState {
            mood: settled_reach_server::npc::mood::NpcMood::Neutral,
            changed_tick: 0,
        },
        DerivedTellState::default(),
    ));
    let entity = if let Some(dev) = deviation {
        npc.insert(dev).id()
    } else {
        npc.id()
    };
    (world, entity)
}

#[test]
fn routine_deviation_component_produces_deviation_tell_via_system() {
    // Layer 1 regression: verify that inserting RoutineDeviation on an NPC and running
    // the derive_tell_state system produces TellCategory::RoutineDeviation.
    // This guards against priority regressions in derive_tell_state (D-027 criterion 4).
    let (mut world, entity) = make_tell_world_with_deviation(Some(RoutineDeviation {
        trigger: DeviationTrigger::WalkAway,
        tick: 0,
        expires_at_tick: 300,
    }));

    let mut schedule = Schedule::default();
    schedule.add_systems(settled_reach_server::npc::tell_state::derive_tell_state);
    schedule.run(&mut world);

    let tell = world.get::<DerivedTellState>(entity).unwrap();
    assert_eq!(
        tell.category,
        Some(TellCategory::RoutineDeviation),
        "NPC with RoutineDeviation component must produce RoutineDeviation tell (D-027 criterion 4)"
    );
}

#[test]
fn no_deviation_component_does_not_produce_deviation_tell() {
    // Layer 1 regression: absence of RoutineDeviation must not produce deviation tell.
    let (mut world, entity) = make_tell_world_with_deviation(None);

    let mut schedule = Schedule::default();
    schedule.add_systems(settled_reach_server::npc::tell_state::derive_tell_state);
    schedule.run(&mut world);

    let tell = world.get::<DerivedTellState>(entity).unwrap();
    assert_ne!(
        tell.category,
        Some(TellCategory::RoutineDeviation),
        "NPC without RoutineDeviation must not produce RoutineDeviation tell"
    );
}

// ---------------------------------------------------------------------------
// Layer 2: activation event → RoutineDeviation insertion (pending #589)
// ---------------------------------------------------------------------------

/// Set up a minimal gauntlet-based app with storyteller plugin running.
#[cfg(feature = "gauntlet")]
fn build_storyteller_app() -> App {
    use settled_reach_server::{
        bridge::types::CharacterArchetype, simulation::SimulationPlugin, test_world,
    };
    let mut app = App::new();
    app.add_plugins(SimulationPlugin);
    test_world::setup_gauntlet(&mut app, CharacterArchetype::default());
    app
}

/// Retrieve the first NPC entity visible in the gauntlet (used to fabricate test events).
#[cfg(feature = "gauntlet")]
fn first_npc_entity(app: &mut App) -> Entity {
    use settled_reach_server::npc::Npc;
    let mut q = app.world_mut().query_filtered::<Entity, With<Npc>>();
    q.iter(app.world())
        .next()
        .expect("gauntlet must have at least one NPC")
}

#[cfg(feature = "gauntlet")]
#[test]
#[ignore = "pending escalate_tells_on_activation system (#589)"]
fn triangle_activation_event_inserts_routine_deviation_on_anchor_npc() {
    // Inject a TriangleActivatedEvent pointing to an NPC, run one tick, assert
    // RoutineDeviation is inserted on that NPC by escalate_tells_on_activation.
    use settled_reach_server::simulation::triangle::TriangleId;
    use settled_reach_server::storyteller::{TriangleActivatedEvent, TriangleActivatedQueue};

    let mut app = build_storyteller_app();
    // Run one tick so the world is fully initialized before we inject
    app.update();

    let anchor = first_npc_entity(&mut app);

    {
        let mut queue = app.world_mut().resource_mut::<TriangleActivatedQueue>();
        queue.push(TriangleActivatedEvent {
            triangle_id: TriangleId::from_seed_and_slug(42, "test-escalation"),
            tick: 1,
            anchor_entity: anchor,
            anchor_score: 25.0,
        });
    }

    // Run one tick — escalate_tells_on_activation should fire
    app.update();

    let deviation = app.world().get::<RoutineDeviation>(anchor);
    assert!(
        deviation.is_some(),
        "Anchor NPC must have RoutineDeviation after TriangleActivated event (#589, D-024 axis 9)"
    );
}

#[cfg(feature = "gauntlet")]
#[test]
#[ignore = "pending escalate_tells_on_activation system (#589)"]
fn triangle_activation_produces_routine_deviation_tell_in_snapshot() {
    // End-to-end: after activation event, DerivedTellState on anchor NPC must be
    // TellCategory::RoutineDeviation. This verifies the full axis-9 pipeline.
    use settled_reach_server::simulation::triangle::TriangleId;
    use settled_reach_server::storyteller::{TriangleActivatedEvent, TriangleActivatedQueue};

    let mut app = build_storyteller_app();
    app.update(); // initialize

    let anchor = first_npc_entity(&mut app);
    {
        let mut queue = app.world_mut().resource_mut::<TriangleActivatedQueue>();
        queue.push(TriangleActivatedEvent {
            triangle_id: TriangleId::from_seed_and_slug(42, "test-tell"),
            tick: 1,
            anchor_entity: anchor,
            anchor_score: 25.0,
        });
    }
    app.update(); // activation tick
    app.update(); // derive_tell_state tick

    let tell = app.world().get::<DerivedTellState>(anchor);
    assert_eq!(
        tell.map(|t| t.category),
        Some(Some(TellCategory::RoutineDeviation)),
        "After triangle activation, anchor NPC's tell must be RoutineDeviation (D-027 criterion 4)"
    );
}

#[cfg(feature = "gauntlet")]
#[test]
#[ignore = "pending expires_at_tick field and removal system (#589)"]
fn routine_deviation_expires_after_duration() {
    // After TELL_ESCALATION_DURATION_TICKS ticks, RoutineDeviation must be removed
    // by the expiry system. This verifies the component doesn't persist forever.
    //
    // Edge case: D-027 criterion 4 must continue to fire DURING the window
    // and stop firing AFTER it. NPCs shouldn't be permanently flagged.
    use settled_reach_server::simulation::triangle::TriangleId;
    use settled_reach_server::storyteller::{TriangleActivatedEvent, TriangleActivatedQueue};
    // NOTE: TELL_ESCALATION_DURATION_TICKS constant (= 300) expected in storyteller module.
    //       This test will need updating once the constant is public.

    let mut app = build_storyteller_app();
    app.update(); // initialize

    let anchor = first_npc_entity(&mut app);
    {
        let mut queue = app.world_mut().resource_mut::<TriangleActivatedQueue>();
        queue.push(TriangleActivatedEvent {
            triangle_id: TriangleId::from_seed_and_slug(42, "test-expiry"),
            tick: 1,
            anchor_entity: anchor,
            anchor_score: 25.0,
        });
    }

    // Run enough ticks to trigger expiry (301 > TELL_ESCALATION_DURATION_TICKS = 300).
    // Note: 302 updates is acceptable for a unit test; if this becomes a perf concern
    // when un-ignored, consider advancing SimulationTime directly instead of looping.
    for _ in 0..302 {
        app.update();
    }

    let deviation = app.world().get::<RoutineDeviation>(anchor);
    assert!(
        deviation.is_none(),
        "RoutineDeviation must be removed after TELL_ESCALATION_DURATION_TICKS ticks (#589). \
         Persistent deviation would flag NPCs permanently — breaking the tell signal over time."
    );
}