// 전역 상태 — Solid 시그널 기반 단일 스토어 모듈.
import { createSignal } from "solid-js";
import { createStore, produce } from "solid-js/store";
import {
  appInfo,
  folderSnapshot,
  searchSnapshot,
  smartSnapshot,
  tagSnapshot,
  Snapshot,
  type AppInfo,
  type ScanProgress,
} from "../ipc/commands";

// ── 앱 정보 (미디어 서버 포트/토큰 포함) ─────────────────
const [info, setInfo] = createSignal<AppInfo | undefined>();
export { info };

export async function loadAppInfo(): Promise<void> {
  try {
    setInfo(await appInfo());
  } catch (e) {
    console.error("app_info 실패", e);
  }
}

// ── 현재 뷰 ─────────────────────────────────────────────
export type View =
  | { type: "all" }
  | { type: "source"; sourceId: number }
  | { type: "folder"; folderId: number; recursive: boolean }
  | { type: "search"; query: string }
  | { type: "tag"; tagId: number }
  | { type: "smart"; smartId: number };

const [view, setViewSignal] = createSignal<View>({ type: "all" });
const [snapshot, setSnapshot] = createSignal<Snapshot | undefined>();
const [loading, setLoading] = createSignal(false);
export { view, snapshot, loading };

let viewSeq = 0;

export async function setView(v: View): Promise<void> {
  setViewSignal(v);
  clearSelection();
  await refreshSnapshot();
}

export async function refreshSnapshot(): Promise<void> {
  const v = view();
  const seq = ++viewSeq;
  setLoading(true);
  try {
    let snap: Snapshot;
    switch (v.type) {
      case "all":
        snap = await folderSnapshot({});
        break;
      case "source":
        snap = await folderSnapshot({ sourceId: v.sourceId });
        break;
      case "folder":
        snap = await folderSnapshot({ folderId: v.folderId, recursive: v.recursive });
        break;
      case "search":
        snap = await searchSnapshot(v.query);
        break;
      case "tag":
        snap = await tagSnapshot(v.tagId);
        break;
      case "smart":
        snap = await smartSnapshot(v.smartId);
        break;
    }
    if (seq === viewSeq) setSnapshot(snap);
  } finally {
    if (seq === viewSeq) setLoading(false);
  }
}

// ── 선택 ────────────────────────────────────────────────
const [selected, setSelected] = createSignal<ReadonlySet<number>>(new Set());
const [anchorIndex, setAnchorIndex] = createSignal<number>(-1);
export { selected, anchorIndex };

export function selectSingle(id: number, index: number): void {
  setSelected(new Set([id]));
  setAnchorIndex(index);
}

export function toggleSelect(id: number, index: number): void {
  const next = new Set<number>(selected());
  if (next.has(id)) next.delete(id);
  else next.add(id);
  setSelected(next);
  setAnchorIndex(index);
}

export function selectRange(snap: Snapshot, toIndex: number): void {
  const from = anchorIndex() < 0 ? toIndex : anchorIndex();
  const [a, b] = from <= toIndex ? [from, toIndex] : [toIndex, from];
  const next = new Set<number>();
  for (let i = a; i <= b; i++) next.add(snap.id(i));
  setSelected(next);
}

export function clearSelection(): void {
  setSelected(new Set<number>());
  setAnchorIndex(-1);
}

/** 마퀴(드래그 사각형) 선택 — id 집합으로 직접 설정 */
export function setSelectionFromIds(ids: number[]): void {
  setSelected(new Set<number>(ids));
}

// ── 썸네일 갱신 버전 (thumbs-ready 이벤트로 증가) ────────
const [thumbVersions, setThumbVersions] = createStore<Record<number, number>>({});
export { thumbVersions };

export function bumpThumbVersions(ids: number[]): void {
  setThumbVersions(
    produce((s) => {
      for (const id of ids) s[id] = (s[id] ?? 0) + 1;
    }),
  );
}

// ── 스캔 진행 ───────────────────────────────────────────
const [scanProgress, setScanProgress] = createSignal<ScanProgress | undefined>();
export { scanProgress };

export function updateScanProgress(p: ScanProgress): void {
  setScanProgress(p.done ? undefined : p);
}

// ── 사이드바 새로고침 트리거 ─────────────────────────────
const [sidebarVersion, setSidebarVersion] = createSignal(0);
export { sidebarVersion };
export const refreshSidebar = () => setSidebarVersion((v) => v + 1);

// ── 그리드 썸네일 크기(줌) ───────────────────────────────
export const GRID_ROW_MIN = 110;
export const GRID_ROW_MAX = 420;
const GRID_ROW_KEY = "archive.grid.rowHeight";
const initialRow = Number(localStorage.getItem(GRID_ROW_KEY) ?? "200");
const [gridRowHeight, setGridRowHeightRaw] = createSignal(
  Number.isFinite(initialRow) ? Math.min(GRID_ROW_MAX, Math.max(GRID_ROW_MIN, initialRow)) : 200,
);
export { gridRowHeight };

export function setGridRowHeight(px: number): void {
  const clamped = Math.min(GRID_ROW_MAX, Math.max(GRID_ROW_MIN, Math.round(px)));
  setGridRowHeightRaw(clamped);
  localStorage.setItem(GRID_ROW_KEY, String(clamped));
}

/** 상대 배율로 줌 (Ctrl+휠) */
export function zoomGrid(factor: number): void {
  setGridRowHeight(gridRowHeight() * factor);
}

// ── 영상 재생목록 옵션 ───────────────────────────────────
const [repeatMode, setRepeatMode] = createSignal(false);
export { repeatMode };
export const toggleRepeat = () => setRepeatMode((r) => !r);

// ── 중복 검토 패널 ───────────────────────────────────────
const [dedupeOpen, setDedupeOpen] = createSignal(false);
export { dedupeOpen };
export const openDedupe = () => setDedupeOpen(true);
export const closeDedupe = () => setDedupeOpen(false);

// ── 상태 메시지 (토스트) ─────────────────────────────────
const [statusMessage, setStatusMessage] = createSignal<string | undefined>();
export { statusMessage };
let toastTimer: ReturnType<typeof setTimeout> | undefined;

export function toast(msg: string): void {
  setStatusMessage(msg);
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => setStatusMessage(undefined), 4000);
}

// ── 라이트박스 ──────────────────────────────────────────
const [lightboxIndex, setLightboxIndex] = createSignal<number | null>(null);
export { lightboxIndex };

export function openLightbox(index: number): void {
  const snap = snapshot();
  if (!snap || index < 0 || index >= snap.count) return;
  setLightboxIndex(index);
}

export function closeLightbox(): void {
  setLightboxIndex(null);
}

export function navLightbox(delta: number): void {
  const snap = snapshot();
  const cur = lightboxIndex();
  if (!snap || cur == null) return;
  const next = Math.min(snap.count - 1, Math.max(0, cur + delta));
  setLightboxIndex(next);
  // 라이트박스 이동 시 선택도 따라간다
  selectSingle(snap.id(next), next);
}