/** Current CoA Knight/Rogue God's Sword passive (skill 491621). */
export const ROM_COA_KNIGHT_ROGUE_GODS_SWORD_ID = 491_621;

/** CoA's passive adds 350% of offhand weapon DPS as Light damage. */
export const ROM_COA_KNIGHT_ROGUE_GODS_SWORD_OFFHAND_DPS_COEFFICIENT = 3.5;

export interface RomCoaKnightRogueGodsSwordInput {
  readonly classId: string;
  readonly secondaryClassId: string | null | undefined;
  readonly learnedPassiveSpellIds: readonly number[];
  /** True for a landed offensive physical-ability damage event. */
  readonly landedOffensivePhysicalAbilityDamageEvent: boolean;
  readonly offhandWeaponDps: number;
}

/**
 * Return God's Sword's separate Light-damage rider for one qualifying event.
 *
 * Current CoA describes God's Sword (491621) as a Knight/Rogue passive whose
 * offensive physical abilities inflict 350% offhand weapon DPS Light damage
 * with high aggro generation. The helper models only that documented damage;
 * it does not invent an aggro multiplier or decide how callers divide
 * multi-hit, channel, or area actions into damage events.
 *
 * The explicit patch chain identifies this as the same reworked ability:
 * 10.6.1 made it an active offhand-DPS physical rider, 11.1.5 changed its
 * damage to 350% Light, and 12.1.0 made it passive.
 *
 * Sources:
 * - Current CoA Knight/Rogue skill list: https://chroniclesofarcadia.com/wiki/skills/list/6-3?locale=ru
 * - CoA patch 10.6.1: https://chroniclesofarcadia.com/en/patch/10-6-1-1000
 * - CoA patch 11.1.5: https://chroniclesofarcadia.com/tr/patch/11-1-5-3000
 * - CoA patch 12.1.0: https://chroniclesofarcadia.com/patch/12-1-0-5000
 */
export function romCoaKnightRogueGodsSwordBonusLightDamage(
  input: RomCoaKnightRogueGodsSwordInput,
): number {
  if (input.classId !== "rom-knight"
    || input.secondaryClassId !== "rom-rogue"
    || !input.learnedPassiveSpellIds.includes(ROM_COA_KNIGHT_ROGUE_GODS_SWORD_ID)
    || !input.landedOffensivePhysicalAbilityDamageEvent
    || !Number.isFinite(input.offhandWeaponDps)
    || input.offhandWeaponDps <= 0) {
    return 0;
  }

  const damage = input.offhandWeaponDps * ROM_COA_KNIGHT_ROGUE_GODS_SWORD_OFFHAND_DPS_COEFFICIENT;
  return Number.isFinite(damage) ? damage : 0;
}