import { TRIGGER_TYPES } from "../constants.js";
import { handleTrigger } from "../engine/reaction-engine.js";
import { getBestTokenDocumentForActor } from "../utils/token-utils.js";

export function registerDnd5eDamageTrigger() {
  Hooks.on("dnd5e.applyDamage", async (actor, amount, options = {}) => {
    if (!game.user.isGM) return;
    if (!actor) return;

    const tokenDocument = options.token ?? options.tokenDocument ?? getBestTokenDocumentForActor(actor);
    const damageTypes = extractDamageTypes(options);

    await handleTrigger(TRIGGER_TYPES.DAMAGE_RECEIVED, {
      actor,
      targetActor: actor,
      tokenDocument,
      targetTokenDocument: tokenDocument,
      targetToken: tokenDocument?.object ?? null,
      amount: Number(amount) || 0,
      damageAmount: Number(amount) || 0,
      damageTypes,
      options
    });
  });
}

function extractDamageTypes(options) {
  const candidates = [
    options.damageTypes,
    options.types,
    options.damage?.types,
    options.workflow?.damageItem?.damageDetail?.map?.(part => part.type)
  ];

  const values = candidates.flat().filter(Boolean);
  return [...new Set(values)];
}