import { packageId } from '../constants';

import type { TickwerkCombatant } from '../data/documents/combatant';

export const registerDS4SpecificFunctionality = () => {
  if (CONFIG.tickwerk === undefined) CONFIG.tickwerk = {};
  foundry.utils.mergeObject(CONFIG.tickwerk, { getTieBreaker, getInitiativeFormula });
};

const getTieBreaker = async (combatant: TickwerkCombatant, combatants: TickwerkCombatant[]): Promise<number> => {
  if (combatants.length === 0) return 0;
  const tieBreakers = combatants.map((combatant) => {
    return (
      (combatant._newTieBreaker !== undefined
        ? combatant._newTieBreaker
        : combatant.getFlag(packageId, 'tieBreaker')) ?? 0
    );
  });
  return Math.max(...tieBreakers) + 1;
};

const getInitiativeFormula = (combatant: TickwerkCombatant) => {
  const started = combatant.combat?.started ?? false;
  if (!started) return '-@combatValues.initiative.total';
  const tickValue = combatant.combat?.round ?? 0;
  return `max(${tickValue} + 10 - @combatValues.initiative.total, ${tickValue})`;
};