export const WOW335_ROGUE_KILLING_SPREE_DURATION_MS = 2_000;
export const WOW335_ROGUE_KILLING_SPREE_INTERVAL_MS = 500;
export const WOW335_ROGUE_KILLING_SPREE_ASSAULTS = 5;

export interface Wow335KillingSpreeWeaponSnapshot {
  readonly hand: "main-hand" | "off-hand";
  readonly weaponType?: string;
  readonly damageMin: number;
  readonly damageMax: number;
  readonly speedMs: number;
}

export interface Wow335KillingSpreeHit {
  readonly hand: "main-hand" | "off-hand";
  readonly damage: number;
  readonly speedMs: number;
  readonly dbcSpellId: 57841 | 57842;
}

export interface Wow335KillingSpreeWindow {
  readonly ownerActorId: string;
  readonly abilityId: string;
  readonly role: import("./partyRoles").PartyRole;
  readonly startedAt: number;
  readonly endsAt: number;
  readonly nextAssaultAt: number;
  readonly completedAssaults: number;
  readonly targetIds: readonly string[];
  readonly hits: readonly Wow335KillingSpreeHit[];
}

export interface Wow335KillingSpreeAssault {
  readonly at: number;
  readonly index: number;
  readonly targetIds: readonly string[];
}

/**
 * The source's 51690 dummy aura has a 500-ms period, a 2-second duration,
 * and EXTRA_INITIAL_PERIOD, yielding an immediate tick plus four 500-ms ticks.
 */
export function createWow335KillingSpreeWindow(input: {
  readonly ownerActorId: string;
  readonly abilityId: string;
  readonly role: import("./partyRoles").PartyRole;
  readonly now: number;
  readonly targetIds: readonly string[];
  readonly hands: readonly Wow335KillingSpreeWeaponSnapshot[];
  readonly attackPower: number;
  readonly fallbackDamage: number;
}): Wow335KillingSpreeWindow {
  const hands = input.hands.length > 0 ? input.hands : [{
    hand: "main-hand" as const,
    damageMin: 0,
    damageMax: 0,
    speedMs: 2_000,
  }];
  const hits = hands.map((weapon): Wow335KillingSpreeHit => {
    const hasWeaponDamage = weapon.damageMin > 0 || weapon.damageMax > 0;
    const coefficient = weapon.weaponType === "dagger" ? 1.95 : 1.3;
    const damage = hasWeaponDamage
      ? Math.max(1, Math.round(((weapon.damageMin + weapon.damageMax) / 2
        + input.attackPower / 14 * weapon.speedMs / 1_000) * coefficient))
      : Math.max(1, Math.round(input.fallbackDamage));
    return {
      hand: weapon.hand,
      damage,
      speedMs: weapon.speedMs,
      dbcSpellId: weapon.hand === "off-hand" ? 57842 : 57841,
    };
  });
  const uniqueTargetIds = [...new Set(input.targetIds)];
  return {
    ownerActorId: input.ownerActorId,
    abilityId: input.abilityId,
    role: input.role,
    startedAt: input.now,
    endsAt: input.now + WOW335_ROGUE_KILLING_SPREE_DURATION_MS,
    nextAssaultAt: input.now,
    completedAssaults: 0,
    targetIds: uniqueTargetIds,
    hits,
  };
}

/** Advance one scheduled assault and retain its cast-time target list. */
export function advanceWow335KillingSpreeAssault(
  window: Wow335KillingSpreeWindow,
  targetIds: readonly string[],
): { readonly assault: Wow335KillingSpreeAssault; readonly window: Wow335KillingSpreeWindow | null } | null {
  if (window.completedAssaults >= WOW335_ROGUE_KILLING_SPREE_ASSAULTS) return null;
  const assault: Wow335KillingSpreeAssault = {
    at: window.nextAssaultAt,
    index: window.completedAssaults,
    targetIds,
  };
  const completedAssaults = window.completedAssaults + 1;
  return {
    assault,
    window: completedAssaults >= WOW335_ROGUE_KILLING_SPREE_ASSAULTS
      ? null
      : {
        ...window,
        targetIds,
        completedAssaults,
        nextAssaultAt: window.nextAssaultAt + WOW335_ROGUE_KILLING_SPREE_INTERVAL_MS,
      },
  };
}

/** Source retains successful targets, so selection is with replacement. */
export function selectWow335KillingSpreeTarget(
  targetIds: readonly string[],
  roll: number,
): string | null {
  if (targetIds.length === 0) return null;
  const normalizedRoll = Number.isFinite(roll) ? Math.max(0, Math.min(0.999_999_999, roll)) : 0;
  return targetIds[Math.floor(normalizedRoll * targetIds.length)] ?? null;
}