export enum DangerRating {
  WEAK = 'WEAK',
  MATCH = 'MATCH',
  STRONG = 'STRONG',
  VERY_DANGEROUS = 'VERY_DANGEROUS',
  DEADLY = 'DEADLY',
}

export interface CombatantStats {
  attack: number;
  armor: number;
  hp: number;
}

// power(entity) = attack*4 + armor*2 + floor(hp/5) — a deliberately small,
// provisional server-side stand-in for a future CombatPower system (none
// exists yet in this codebase). ratio = monsterPower / characterPower.
export function calculateDangerRating(
  character: CombatantStats,
  monster: CombatantStats,
): DangerRating {
  const power = (stats: CombatantStats) =>
    stats.attack * 4 + stats.armor * 2 + Math.floor(stats.hp / 5);
  const ratio = power(monster) / power(character);

  if (ratio < 0.65) return DangerRating.WEAK;
  if (ratio < 1.0) return DangerRating.MATCH;
  if (ratio < 1.7) return DangerRating.STRONG;
  if (ratio < 2.3) return DangerRating.VERY_DANGEROUS;
  return DangerRating.DEADLY;
}