// NPC module - NPC entity definitions and AI systems
// Implements D-024: 10-axis NPC model + CombatCapability component
// Background tier state machines for schedule, mood, relationships, job

pub mod awareness;
pub mod background;
pub mod blueprint;
pub mod disclosure;
pub mod generate;
pub mod interaction;
pub mod mood;
pub mod relationships;
pub mod routine;
pub mod tell_state;
pub mod tolerance;
pub mod trait_modifiers;
pub mod vision;

use bevy_app::prelude::*;
use bevy_ecs::prelude::*;
use bevy_ecs::schedule::IntoScheduleConfigs;
use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;

use crate::knowledge::types::{FactId, KnowledgeConfidence, StableId};
use crate::simulation::movement::TilePosition;
use crate::simulation::time::DayPhase;

/// NPC plugin: initializes NPC-related resources and systems.
pub struct NpcPlugin;

impl Plugin for NpcPlugin {
    fn build(&self, app: &mut App) {
        app.init_resource::<relationships::RelationshipGraph>()
            .init_resource::<relationships::TrustEventQueue>()
            .init_resource::<relationships::PropagationQueue>()
            .init_resource::<relationships::DelayedTrustQueue>()
            .init_resource::<crate::knowledge::KnowledgeEventQueue>()
            .init_resource::<routine::PreviousDayPhase>()
            .init_resource::<tolerance::ToleranceBreachEventQueue>()
            .init_resource::<routine::RoutineDeviationEventQueue>()
            .init_resource::<disclosure::DisclosureGlobalRateLimit>()
            .init_resource::<trait_modifiers::TraitModifierConfig>()
            .add_systems(
                Update,
                (
                    routine::check_phase_transition
                        .before(crate::simulation::pathfinding::compute_paths),
                    mood::update_mood
                        .after(routine::check_phase_transition)
                        .before(crate::simulation::dialogue::process_talk_interaction),
                    relationships::update_trust
                        .after(crate::simulation::dialogue::process_talk_interaction)
                        .after(crate::simulation::dialogue::process_walk_away)
                        .after(crate::simulation::dialogue::process_confrontation_response)
                        .after(crate::simulation::dialogue::process_dialogue_response)
                        .before(crate::simulation::time::advance_tick),
                    relationships::propagate_social_actions
                        .after(relationships::update_trust)
                        .before(crate::simulation::time::advance_tick),
                    relationships::update_relationship_dynamics
                        .after(relationships::update_trust)
                        .before(crate::simulation::time::advance_tick),
                    routine::enter_activity
                        .after(crate::simulation::movement::validate_movement)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    tolerance::check_tolerance_threshold
                        .after(mood::update_mood)
                        .before(crate::simulation::time::advance_tick),
                    routine::detect_routine_deviation
                        .after(routine::enter_activity)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    tell_state::derive_tell_state
                        .after(mood::update_mood)
                        .after(routine::detect_routine_deviation)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    background::background_tick
                        .after(crate::simulation::movement::validate_movement)
                        .before(crate::simulation::time::advance_tick),
                    disclosure::derive_disclosure_candidates
                        .before(crate::perception::observer::compute_observer_snapshot),
                    disclosure::process_unprompted_disclosure
                        .after(disclosure::derive_disclosure_candidates)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    // NPC player-awareness (#244)
                    awareness::detect_player_awareness
                        .after(vision::compute_npc_vision)
                        .before(tolerance::check_tolerance_threshold),
                    // NPC vision system (#115, D-011)
                    vision::compute_npc_vision
                        .after(crate::simulation::movement::validate_movement)
                        .after(crate::simulation::tier::update_tier_markers)
                        .before(crate::perception::observer::compute_observer_snapshot),
                    vision::emit_npc_vision_events
                        .after(vision::compute_npc_vision)
                        .before(crate::knowledge::events::process_knowledge_events),
                    vision::degrade_npc_inferences
                        .after(vision::emit_npc_vision_events)
                        .before(crate::simulation::time::advance_tick),
                    crate::simulation::dialogue::process_talk_interaction
                        .after(crate::simulation::input::process_player_input),
                    crate::simulation::dialogue::process_walk_away
                        .after(crate::simulation::input::process_player_input)
                        .after(crate::simulation::dialogue::process_talk_interaction),
                    crate::simulation::dialogue::process_confrontation_response
                        .after(crate::simulation::input::process_player_input),
                    crate::simulation::dialogue::process_dialogue_response
                        .after(crate::simulation::input::process_player_input)
                        .after(crate::simulation::dialogue::process_talk_interaction),
                ),
            );

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

#[derive(Component, Debug)]
pub struct Npc;

/// NPC animation tier (D-047).
///
/// Tier 1 (clear): public daily activities — instantly readable.
/// Tier 2 (ambiguous): privately motivated behaviors — player sees the action
/// but cannot determine the intention.
///
/// NPCs start at Tier 1. Confrontation (D-063) and other triggers shift to Tier 2.
#[derive(Component, Debug, Clone, Copy, PartialEq, Eq, Hash, Default, Serialize, Deserialize)]
pub enum AnimationTier {
    /// Clear, readable public activities (walking, working, talking).
    #[default]
    Tier1,
    /// Ambiguous, privately motivated behaviors (pausing, lingering, looking around).
    Tier2,
}

/// Duration (ticks) a storyteller-escalated RoutineDeviation persists.
/// 300 ticks = 30 game-minutes at 10 ticks/game-minute (D-031).
pub const TELL_ESCALATION_DURATION_TICKS: u64 = 300;

/// Tracks why and when an NPC's routine deviated from normal (D-064 Phase 2).
///
/// Inserted when a player action causes an NPC to break from their scheduled
/// behavior. Acts as a hook for the storyteller system and affects future
/// interactions (e.g., second-approach dialogue differences).
///
/// `expires_at_tick`: tick at which this component should be removed.
/// 0 means "never expires" (legacy default for old insertions).
#[derive(Component, Debug, Clone)]
pub struct RoutineDeviation {
    pub trigger: DeviationTrigger,
    pub tick: u64,
    /// Tick at which this deviation expires (component removed by cleanup system).
    /// Set to `tick + TELL_ESCALATION_DURATION_TICKS` for time-limited deviations.
    pub expires_at_tick: u64,
}

/// What caused an NPC's routine deviation.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum DeviationTrigger {
    /// Player walked away mid-dialogue (D-064 Phase 2).
    WalkAway,
    /// Player delivered a confrontation (D-063).
    Confrontation,
    /// Storyteller activated a triangle this NPC belongs to (#589, D-024 axis 9).
    TriangleEscalation,
}

// ---------------------------------------------------------------------------
// Entanglement tag (D-029, #176)
// ---------------------------------------------------------------------------

/// Marks an NPC's narrative entanglement level (D-029).
///
/// - `Flat`: background population — no triangle involvement, minimal story role.
/// - `Mundane`: has routines and personality but no active triangle membership.
/// - `Intrigue`: participates in at least one triangle — drives narrative tension.
///
/// For authored NPCs: determined by YAML `triangle_membership` field.
/// For procedural NPCs: assigned by the 30/50/20 ratio via SimRng.
#[derive(Component, Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum EntanglementTag {
    Flat,
    Mundane,
    Intrigue,
}

// ---------------------------------------------------------------------------
// Axis 1: Want (D-024)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum WantKind {
    Wealth,
    Safety,
    Knowledge,
    Connection,
    Power,
    Freedom,
    Justice,
    Revenge,
    Happiness,
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct Want {
    pub primary: WantKind,
    pub intensity: u8, // 1-10, integer for determinism (D-010)
    pub description: String,
}

// ---------------------------------------------------------------------------
// Axis 2: Secret / vulnerability (D-024)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum SecretSeverity {
    Minor,    // Social embarrassment
    Moderate, // Career-threatening
    Major,    // Criminal / life-threatening
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct Secret {
    pub description: String,
    pub severity: SecretSeverity,
    pub known_by: Vec<StableId>,
}

// ---------------------------------------------------------------------------
// Axis 3: Relationships 1-3 (D-024)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum RelationshipKind {
    Colleague,
    Friend,
    Rival,
    Romantic,
    Family,
    Superior,
    Subordinate,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RelationshipEvent {
    pub tick: u64,
    pub description: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Relationship {
    pub target_id: StableId,
    pub kind: RelationshipKind,
    pub trust_level: i8, // -10..+10, integer for determinism (D-010)
    pub history: Vec<RelationshipEvent>,
}

/// Per-NPC relationship slots. D-024: 3 key relationships for Active-tier.
pub const MAX_KEY_RELATIONSHIPS: usize = 3;

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct Relationships {
    pub entries: Vec<Relationship>,
}

// ---------------------------------------------------------------------------
// Axis 4: Tolerance threshold (D-024)
// ---------------------------------------------------------------------------

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct ToleranceThreshold {
    pub current_stress: i16, // 0-100, integer for determinism (D-010)
    pub threshold: i16,
}

// ---------------------------------------------------------------------------
// Axis 5: Daily routine (D-024, D-031)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RoutineEntry {
    pub phase: DayPhase,
    pub location: TilePosition,
    pub activity: String,
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct DailyRoutine {
    pub entries: Vec<RoutineEntry>,
    pub description: String,
}

impl DailyRoutine {
    /// Get the routine entry for a given day phase.
    pub fn entry_for_phase(&self, phase: DayPhase) -> Option<&RoutineEntry> {
        self.entries.iter().find(|e| e.phase == phase)
    }

    /// Get the expected location for a given day phase.
    pub fn expected_location(&self, phase: DayPhase) -> Option<TilePosition> {
        self.entry_for_phase(phase).map(|e| e.location)
    }
}

// ---------------------------------------------------------------------------
// Axis 6: Information inventory (D-024)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct KnownFact {
    pub fact_id: FactId,
    pub confidence: KnowledgeConfidence,
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct InformationInventory {
    pub facts: Vec<KnownFact>,
}

// ---------------------------------------------------------------------------
// Axis 7: Contentment (D-024, Gore's thematic axis)
// ---------------------------------------------------------------------------

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct Contentment {
    pub level: i16, // -100..+100, integer for determinism (D-010)
}

// ---------------------------------------------------------------------------
// Job performance (D-026 background state machine — feeds from Contentment)
// ---------------------------------------------------------------------------

/// Tracks how well an NPC performs their job role.
///
/// Drifts based on `Contentment` level in the background-tier state machine:
/// - contentment > 0 → score increases toward 100
/// - contentment < 0 → score decreases toward 0
/// - contentment = 0 → no change
///
/// Updated by `background::background_tick` once per game-minute for
/// Background-tier NPCs. Persists through tier promotions (D-026).
#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct JobPerformance {
    pub score: i16, // 0..=100, integer for determinism (D-010)
}

impl Default for JobPerformance {
    fn default() -> Self {
        Self { score: 50 }
    }
}

// ---------------------------------------------------------------------------
// Supporting axis 1: Personality traits (D-024)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum PersonalityTrait {
    Cautious,
    Bold,
    Honest,
    Deceptive,
    Compassionate,
    Ruthless,
    Curious,
    Incurious,
    Social,
    Reclusive,
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct PersonalityTraits {
    pub traits: Vec<PersonalityTrait>,
}

// ---------------------------------------------------------------------------
// Supporting axis 2: Tell system (D-024)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum TellTrigger {
    StressAboveThreshold,
    NearSpecificEntity(StableId),
    DuringActivity(String),
    TimeOfDay(DayPhase),
    Always,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Tell {
    pub trigger: TellTrigger,
    pub behavior: String,
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct TellSystem {
    pub tells: Vec<Tell>,
}

// ---------------------------------------------------------------------------
// Supporting axis 3: Skill set + combat component (D-024)
// ---------------------------------------------------------------------------

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
pub enum Skill {
    Combat,
    Intimidation,
    Medical,
    Observation,
    Persuasion,
    Piloting,
    Stealth,
    Technical,
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct SkillSet {
    pub skills: BTreeMap<Skill, u8>, // Skill -> proficiency (1-10), BTreeMap for determinism
    pub combat_trained: bool,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum CombatStyle {
    Ranged,
    Melee,
    Evasive,
    Defensive,
}

#[derive(Component, Debug, Clone, Serialize, Deserialize)]
pub struct CombatCapability {
    pub weapon_proficiency: u8, // 1-10
    pub combat_style: CombatStyle,
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn daily_routine_entry_for_phase() {
        let routine = DailyRoutine {
            entries: vec![
                RoutineEntry {
                    phase: DayPhase::Morning,
                    location: TilePosition::new(5, 5, 0),
                    activity: "Work".into(),
                },
                RoutineEntry {
                    phase: DayPhase::Evening,
                    location: TilePosition::new(10, 10, 0),
                    activity: "Bar".into(),
                },
            ],
            description: "Test routine".into(),
        };

        assert_eq!(
            routine.expected_location(DayPhase::Morning),
            Some(TilePosition::new(5, 5, 0))
        );
        assert_eq!(
            routine.expected_location(DayPhase::Evening),
            Some(TilePosition::new(10, 10, 0))
        );
        assert_eq!(routine.expected_location(DayPhase::Afternoon), None);
        assert_eq!(routine.expected_location(DayPhase::Night), None);
    }

    #[test]
    fn skill_set_btreemap_deterministic() {
        let mut skills1 = BTreeMap::new();
        skills1.insert(Skill::Combat, 5);
        skills1.insert(Skill::Stealth, 3);
        skills1.insert(Skill::Persuasion, 7);

        let mut skills2 = BTreeMap::new();
        skills2.insert(Skill::Persuasion, 7);
        skills2.insert(Skill::Combat, 5);
        skills2.insert(Skill::Stealth, 3);

        // Insertion order doesn't matter — iteration is deterministic
        let keys1: Vec<_> = skills1.keys().collect();
        let keys2: Vec<_> = skills2.keys().collect();
        assert_eq!(keys1, keys2);
    }

    #[test]
    fn relationship_max_entries() {
        let rels = Relationships {
            entries: vec![
                Relationship {
                    target_id: StableId(1),
                    kind: RelationshipKind::Friend,
                    trust_level: 5,
                    history: vec![],
                },
                Relationship {
                    target_id: StableId(2),
                    kind: RelationshipKind::Colleague,
                    trust_level: 2,
                    history: vec![],
                },
                Relationship {
                    target_id: StableId(3),
                    kind: RelationshipKind::Rival,
                    trust_level: -3,
                    history: vec![],
                },
            ],
        };
        assert_eq!(rels.entries.len(), MAX_KEY_RELATIONSHIPS);
    }
}