/**
 * Mandu Hydration Runtime 🌊
 * v0.8.0: Dynamic Import 기반 아키텍처
 *
 * 이 파일은 타입 정의와 유틸리티 함수를 제공합니다.
 * 실제 Hydration Runtime은 client/runtime-entry.ts에서 번들링됩니다.
 */

import { getHydratedRoots, getServerData as getGlobalServerData } from "./window-state";

/**
 * Hydration 상태 추적
 */
export interface HydrationState {
  total: number;
  hydrated: number;
  failed: number;
  recoverableErrors: number;
  pending: Set<string>;
}

/**
 * Hydration 우선순위
 */
export type HydrationPriority = "immediate" | "visible" | "idle" | "interaction";

/**
 * 서버 데이터 가져오기
 */
export function getServerData<T = unknown>(islandId: string): T | undefined {
  if (typeof window === "undefined") return undefined;
  return getGlobalServerData<T>(islandId);
}

/**
 * Hydration 상태 조회 (DOM 기반)
 */
export function getHydrationState(): Readonly<HydrationState> {
  if (typeof document === "undefined") {
    return { total: 0, hydrated: 0, failed: 0, recoverableErrors: 0, pending: new Set() };
  }

  const islands = document.querySelectorAll<HTMLElement>("[data-mandu-island]");
  const hydrated = document.querySelectorAll<HTMLElement>("[data-mandu-hydrated]");
  const failed = document.querySelectorAll<HTMLElement>("[data-mandu-error]");
  const recoverableErrors = document.querySelectorAll<HTMLElement>("[data-mandu-recoverable-error]");

  const pending = new Set<string>();
  islands.forEach((el) => {
    const id = el.getAttribute("data-mandu-island");
    if (id && !el.hasAttribute("data-mandu-hydrated") && !el.hasAttribute("data-mandu-error")) {
      pending.add(id);
    }
  });

  return {
    total: islands.length,
    hydrated: hydrated.length,
    failed: failed.length,
    recoverableErrors: recoverableErrors.length,
    pending,
  };
}

/**
 * 특정 Island unmount
 */
export function unmountIsland(id: string): boolean {
  const roots = getHydratedRoots();
  const root = roots.get(id);
  if (!root) {
    return false;
  }

  root.unmount();
  roots.delete(id);
  return true;
}

/**
 * 모든 Island unmount
 */
export function unmountAllIslands(): void {
  const roots = getHydratedRoots();
  for (const [id, root] of roots) {
    root.unmount();
    roots.delete(id);
  }
}