foundry-dnd5e-adaptive-resistances/scripts/effects.js

import { MODULE_ID, EFFECT_FLAG, ADAPTATION_CONFIG, ADAPTATION_TYPES } from "./constants.js";
import { getDamageTypeLabel } from "./utils.js";

export async function removeOldAdaptiveEffects(actor) {
  const oldEffects = actor.effects.filter(effect => effect.getFlag(MODULE_ID, EFFECT_FLAG));
  if (!oldEffects.length) return;

  await actor.deleteEmbeddedDocuments("ActiveEffect", oldEffects.map(effect => effect.id));
}

export async function createAdaptiveEffect(actor, damageType, adaptationType = ADAPTATION_TYPES.RESISTANCE) {
  const config = ADAPTATION_CONFIG[adaptationType] ?? ADAPTATION_CONFIG[ADAPTATION_TYPES.RESISTANCE];
  const label = getDamageTypeLabel(damageType);

  await actor.createEmbeddedDocuments("ActiveEffect", [
    {
      name: game.i18n.format(config.effectNameKey, { type: label }),
      icon: config.icon,
      disabled: false,
      transfer: false,
      flags: {
        [MODULE_ID]: {
          [EFFECT_FLAG]: {
            adaptationType: config.id,
            damageType
          }
        }
      },
      changes: [
        {
          key: config.traitKey,
          mode: CONST.ACTIVE_EFFECT_MODES.ADD,
          value: damageType,
          priority: 20
        }
      ]
    }
  ]);
}

export async function createAdaptiveResistanceEffect(actor, damageType) {
  return createAdaptiveEffect(actor, damageType, ADAPTATION_TYPES.RESISTANCE);
}