/**
 * Creature Types — data definitions for the creature/ecology system
 *
 * Catalytic Wastes: Crystallids, Acidophiles, Reagents
 * Kinetic Mountains: Pendulums, Mechanoids, Resonators
 * Verdant Forests: Symbiotes, Mimics, Spore-bearers
 */

/** Species identifier (stored as numeric ID in ECS components) */
export enum SpeciesId {
  Crystallid = 0,
  Acidophile = 1,
  Reagent = 2,
  Pendulum = 3,
  Mechanoid = 4,
  Resonator = 5,
  Symbiote = 6,
  Mimic = 7,
  SporeBearer = 8,
}

/** AI behavior state (FSM) */
export enum AIState {
  Idle = 0,
  Wander = 1,
  Feed = 2,
  Flee = 3,
  Attack = 4,
}

/** Life cycle stage */
export enum LifeStage {
  Egg = 0,
  Youth = 1,
  Mature = 2,
  Aging = 3,
}

/** Diet type — what a creature can feed on */
export type DietType = 'mineral' | 'acid' | 'creature';

/** Species definition loaded from creatures.json */
export interface SpeciesData {
  id: string;
  name: string;
  nameRu: string;
  speciesId: SpeciesId;
  biome: string;             // biome id this species belongs to
  description: string;
  descriptionRu: string;

  /** Visual */
  color: string;       // hex color string
  radius: number;      // base radius in pixels
  radiusYouth: number; // smaller when young

  /** Stats */
  health: number;
  speed: number;       // pixels per second
  damage: number;      // damage per attack
  armor: number;       // damage reduction (0-1)

  /** Metabolism */
  diet: DietType;
  dietTiles: string[];         // tile names this species feeds on
  excretionElement: number;    // atomic number of excreted element (0 = none)
  energyMax: number;           // max energy capacity
  energyPerFeed: number;       // energy gained per feeding
  energyDrainPerSecond: number; // passive energy loss rate
  hungerThreshold: number;     // below this → seek food (0-1 fraction of max)

  /** Behavior */
  aggressionRadius: number;  // distance to detect threats
  fleeRadius: number;        // distance to start fleeing
  wanderRadius: number;      // max wander distance from home
  attackRange: number;       // melee attack range
  attackCooldown: number;    // ms between attacks

  /** Life cycle durations (ms) */
  eggDuration: number;
  youthDuration: number;
  matureDuration: number;
  agingDuration: number;

  /** Reproduction */
  reproductionEnergy: number;  // energy cost to reproduce
  offspringCount: number;      // eggs per reproduction event

  /** Population */
  maxPopulation: number;        // per-species cap
  spawnWeight: number;          // relative spawn density (0-1)
  preferredTiles: string[];     // tiles where this species spawns
}

/** Runtime creature state (non-ECS, for string data lookup) */
export interface CreatureInfo {
  speciesId: SpeciesId;
  speciesDataId: string;   // key into species registry
}

/** Creature species registry */
export class SpeciesRegistry {
  private byId = new Map<string, SpeciesData>();
  private byNumericId = new Map<SpeciesId, SpeciesData>();

  constructor(data: SpeciesData[]) {
    for (const species of data) {
      this.byId.set(species.id, species);
      this.byNumericId.set(species.speciesId, species);
    }
  }

  /** Get species by string ID */
  get(id: string): SpeciesData | undefined {
    return this.byId.get(id);
  }

  /** Get species by numeric ID (from ECS component) */
  getByNumericId(id: SpeciesId): SpeciesData | undefined {
    return this.byNumericId.get(id);
  }

  /** Get all species */
  getAll(): SpeciesData[] {
    return [...this.byId.values()];
  }

  /** Get species count */
  get count(): number {
    return this.byId.size;
  }
}