//! Knowledge graph module (D-041).
//!
//! Implements information boundaries (D-010 principle 2): every piece of
//! state is tagged with who knows it. Per-entity KnowledgeGraph component
//! tracks what each entity knows about others and the world.

use bevy_app::prelude::*;
use bevy_ecs::prelude::*;

pub mod content_registry;
pub mod events;
pub mod graph;
pub mod registry;
pub mod types;

pub use content_registry::ContentEntityRegistry;
pub use events::{
    ContradictionDetectedEvent, ContradictionDetectedQueue, InteractionType, KnowledgeEvent,
    KnowledgeEventQueue, KnowledgeEventType, ProcessedEntityGrant, ProcessedFactGrant,
    ProcessedKnowledgeGrant,
};
pub use graph::KnowledgeGraph;
pub use registry::{EntityRegistry, StableEntityId};
pub use types::*;

/// Knowledge system plugin.
/// Registers resources and systems for knowledge graph processing.
pub struct KnowledgePlugin;

impl Plugin for KnowledgePlugin {
    fn build(&self, app: &mut App) {
        app.init_resource::<KnowledgeEventQueue>()
            .init_resource::<ContradictionDetectedQueue>()
            .init_resource::<EntityRegistry>()
            .init_resource::<ContentEntityRegistry>()
            .init_resource::<DecayThresholds>()
            .add_systems(
                Update,
                (
                    events::process_knowledge_events
                        .after(crate::perception::observer::compute_observer_snapshot),
                    events::decay_knowledge.after(events::process_knowledge_events),
                ),
            );
        tracing::debug!("KnowledgePlugin initialized");
    }
}