import type { ActiveAura, AuraDefinition } from "./combatAuras";

export const ROGUE_INSTANT_POISON_TAG = "rogue-instant-poison";
export const ROGUE_DEADLY_POISON_COATING_TAG = "rogue-deadly-poison-coating";
export const ROGUE_DEADLY_POISON_DOSE_TAG = "rogue-deadly-poison-dose";
export const ROGUE_ENVENOM_BUFF_TAG = "rogue-envenom-poison-buff";

export const ROGUE_DEADLY_POISON_AURA: AuraDefinition = Object.freeze({
  id: "rogue-deadly-poison-doses",
  name: "Deadly Poison",
  description: "Deals Nature damage every 3 sec. Stacks up to 5 times.",
  disposition: "debuff",
  durationMs: 12_000,
  maxStacks: 5,
  stackBehavior: "add",
  uniqueBySource: true,
  utilityTags: [ROGUE_DEADLY_POISON_DOSE_TAG],
  dispelCategory: "poison",
});

export interface RoguePoisonFinisherScaling {
  readonly doseAuraTag: string;
  readonly maximumDoses: number;
  readonly basePointsPerDose: number;
  readonly attackPowerCoefficientPerDose: number;
}

export interface RoguePoisonApplicationChances {
  readonly instant: number;
  readonly deadly: number;
}

const MASTER_POISONER_TALENT_ID = "talent-1715";

const INSTANT_POISON_BASE_BY_LEVEL: readonly (readonly [level: number, amount: number])[] = [
  [20, 22], [28, 43], [36, 79], [44, 121], [52, 170], [60, 225], [68, 284], [73, 350],
];

const DEADLY_POISON_TICK_BY_LEVEL: readonly (readonly [level: number, amount: number])[] = [
  [30, 12], [38, 20], [46, 28], [54, 36], [60, 44], [62, 52], [70, 62], [76, 74],
];

function rankAmount(level: number, ranks: readonly (readonly [level: number, amount: number])[]): number {
  let amount = ranks[0]?.[1] ?? 1;
  for (const [requiredLevel, rankAmountValue] of ranks) {
    if (level < requiredLevel) break;
    amount = rankAmountValue;
  }
  return amount;
}

export function rogueInstantPoisonDamage(level: number, attackPower: number): number {
  return Math.max(1, Math.round(rankAmount(level, INSTANT_POISON_BASE_BY_LEVEL) + Math.max(0, attackPower) * 0.1));
}

export function rogueDeadlyPoisonTickDamage(level: number, attackPower: number, stacks: number): number {
  const boundedStacks = Math.max(0, Math.min(5, Math.floor(stacks)));
  return Math.max(0, Math.round(
    (rankAmount(level, DEADLY_POISON_TICK_BY_LEVEL) + Math.max(0, attackPower) * 0.03) * boundedStacks,
  ));
}

export function roguePoisonApplicationChances(envenomBuffActive: boolean): RoguePoisonApplicationChances {
  return Object.freeze({
    // Envenom increases Instant Poison's application frequency by 75% and
    // adds 15 percentage points to Deadly Poison's application chance.
    instant: 0.2 * (envenomBuffActive ? 1.75 : 1),
    deadly: 0.3 + (envenomBuffActive ? 0.15 : 0),
  });
}

export function rogueEnvenomPreservationChance(
  talentRanks: Readonly<Record<string, number>>,
): number {
  const rank = Math.max(0, Math.min(3, Math.floor(talentRanks[MASTER_POISONER_TALENT_ID] ?? 0)));
  return [0, 0.33, 0.66, 1][rank] ?? 0;
}

function stableRogueUnit(seed: string): number {
  let hash = 2166136261;
  for (let index = 0; index < seed.length; index += 1) {
    hash ^= seed.charCodeAt(index);
    hash = Math.imul(hash, 16777619);
  }
  return (hash >>> 0) / 0x1_0000_0000;
}

export function rogueEnvenomPreservesDeadlyPoison(
  talentRanks: Readonly<Record<string, number>>,
  seed: string,
): boolean {
  const chance = rogueEnvenomPreservationChance(talentRanks);
  return chance >= 1 || (chance > 0 && stableRogueUnit(seed) < chance);
}

export function matchingAuraStacks(
  auras: readonly ActiveAura[],
  tag: string,
  sourceId: string,
  targetId: string,
  now: number,
): number {
  return auras.find((aura) => (
    aura.sourceId === sourceId
    && aura.targetId === targetId
    && (aura.expiresAt === null || aura.expiresAt > now)
    && aura.definition.utilityTags?.includes(tag)
  ))?.stacks ?? 0;
}

export function hasActiveAuraTag(
  auras: readonly ActiveAura[],
  tag: string,
  targetId: string,
  now: number,
): boolean {
  return auras.some((aura) => (
    aura.targetId === targetId
    && (aura.expiresAt === null || aura.expiresAt > now)
    && aura.definition.utilityTags?.includes(tag)
  ));
}