// Simulation module - Core simulation plugin and systems
// Implements deterministic tick-based simulation (D-010 principle 4)

use bevy_app::prelude::*;
use bevy_ecs::schedule::IntoScheduleConfigs;

pub mod contraband;
pub mod conversation;
pub mod dialogue;
pub mod examine;
pub mod follow;
pub mod input;
pub mod interaction;
pub mod inventory;
pub mod listening;
pub mod monologue;
pub mod movement;
pub mod npc_knowledge_transfer;
pub mod path_follow;
pub mod pathfinding;
pub mod poi;
pub mod poi_discovery;
pub mod pressure;
pub mod rng;
pub mod save_io;
pub mod save_state;
pub mod sound;
pub mod spatial;
pub mod stance;
pub mod tier;
pub mod time;
pub mod zone;

/// Core simulation plugin
/// Manages simulation time, RNG, input processing, and tier transitions
pub struct SimulationPlugin;

impl Plugin for SimulationPlugin {
    fn build(&self, app: &mut App) {
        // Tier marker components (D-026) — must register before behavior systems
        app.add_plugins(tier::TierPlugin);

        // Initialize core simulation resources
        app.init_resource::<time::SimulationTime>()
            .insert_resource(rng::SimRng::new(0))
            .init_resource::<input::InputQueue>()
            .init_resource::<save_io::SaveLoadPending>()
            .init_resource::<crate::knowledge::EntityRegistry>()
            .init_resource::<sound::SoundEventQueue>()
            .init_resource::<spatial::NaiveSpatialIndex>()
            .init_resource::<follow::FollowEndEventQueue>()
            .init_resource::<monologue::PostConversationQueue>()
            .init_resource::<poi_discovery::PoiDiscoveryEventQueue>()
            // discover_pois reads VisibilityGeometry (also populated by PerceptionPlugin).
            // Init here so SimulationPlugin works standalone in tests without PerceptionPlugin.
            .init_resource::<crate::perception::query::VisibilityGeometry>()
            // transfer_npc_knowledge reads RelationshipGraph (also init by NpcPlugin) and
            // KnowledgeEventQueue (also init by KnowledgePlugin).
            // Init here so SimulationPlugin works standalone in tests without those plugins.
            .init_resource::<crate::npc::relationships::RelationshipGraph>()
            .init_resource::<crate::knowledge::KnowledgeEventQueue>()
            .add_systems(
                Update,
                (
                    input::process_player_input,
                    // execute_save_load is an exclusive system (takes &mut World).
                    // Must run after process_player_input (which queues the command)
                    // and before compute_observer_snapshot (which consumes the result).
                    save_io::execute_save_load
                        .after(input::process_player_input)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    pathfinding::compute_paths.after(input::process_player_input),
                    path_follow::follow_paths.after(pathfinding::compute_paths),
                    movement::validate_movement.after(path_follow::follow_paths),
                    path_follow::cleanup_path_blocked.after(movement::validate_movement),
                    spatial::sync_spatial_index.after(movement::validate_movement),
                    listening::update_listening_focus.after(movement::validate_movement),
                    contraband::check_contraband_scan
                        .after(movement::validate_movement)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    conversation::run_npc_conversations
                        .after(movement::validate_movement)
                        .before(sound::collect_sound_events),
                    npc_knowledge_transfer::transfer_npc_knowledge
                        .after(conversation::run_npc_conversations),
                    sound::collect_sound_events
                        .after(movement::validate_movement)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    poi_discovery::discover_pois
                        .after(crate::perception::observer::compute_visibility_geometry)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    examine::process_examine_interaction
                        .after(input::process_player_input)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    // Character pressure (#248) — reads NPC awareness + relationship graph
                    pressure::update_character_pressure
                        .after(crate::npc::awareness::detect_player_awareness)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    time::advance_tick.after(path_follow::cleanup_path_blocked),
                ),
            );

        tracing::debug!("SimulationPlugin initialized");
    }
}