const GLOBAL_HIDDEN_KEY = "tb_qiaobao_hidden_all";
const PAGE_HIDDEN_KEY = "tb_qiaobao_hidden_pages";
const DOCK_EDGE_KEY = "tb_qiaobao_dock_edge";
const POSITION_KEY = "tb_qiaobao_position";
const FIRST_OPEN_KEY = "tb_qiaobao_ai_first_open_v1";
const FIRST_LOGIN_PREFIX = "tb_qiaobao_ai_first_login_v1_";
const CHAT_SESSION_KEY = "tb_qiaobao_ai_session_v1";
const CHAT_HISTORY_PREFIX = "tb_qiaobao_ai_history_v1_";

// Memory-only flag: closing Qiaobao lasts until the App/WebView process restarts.
// It is intentionally not written to storage so users can always recover it by
// reopening the App.
let sessionClosed = false;

function getChatHistoryKey(scope) {
  const safeScope = String(scope || "guest").replace(/[^a-zA-Z0-9_-]/g, "_");
  return `${CHAT_HISTORY_PREFIX}${safeScope}`;
}

export function getQiaobaoChatSessionId() {
  let value = uni.getStorageSync(CHAT_SESSION_KEY);
  if (!value) {
    value = `qb-${Date.now()}-${Math.random().toString(36).slice(2, 10)}`;
    uni.setStorageSync(CHAT_SESSION_KEY, value);
  }
  return value;
}

export function getQiaobaoChatHistory(scope = "guest") {
  const value = uni.getStorageSync(getChatHistoryKey(scope));
  return Array.isArray(value) ? value.slice(-30) : [];
}

export function saveQiaobaoChatHistory(messages, scope = "guest") {
  const safe = Array.isArray(messages)
    ? messages.filter((item) => item && ["user", "assistant"].includes(item.role) && item.content).slice(-30)
    : [];
  uni.setStorageSync(getChatHistoryKey(scope), safe);
}

export function consumeQiaobaoAutoIntro(userId) {
  if (uni.getStorageSync(FIRST_OPEN_KEY) !== true) {
    uni.setStorageSync(FIRST_OPEN_KEY, true);
    return "first-open";
  }
  if (userId !== undefined && userId !== null && String(userId)) {
    const key = `${FIRST_LOGIN_PREFIX}${String(userId)}`;
    if (uni.getStorageSync(key) !== true) {
      uni.setStorageSync(key, true);
      return "first-login";
    }
  }
  return "";
}

export function getQiaobaoDockEdge() {
  return uni.getStorageSync(DOCK_EDGE_KEY) === "left" ? "left" : "right";
}

export function setQiaobaoDockEdge(edge) {
  uni.setStorageSync(DOCK_EDGE_KEY, edge === "left" ? "left" : "right");
}

export function getQiaobaoPosition() {
  const position = uni.getStorageSync(POSITION_KEY);
  if (!position || typeof position !== "object") return null;
  const x = Number(position.x);
  const y = Number(position.y);
  return Number.isFinite(x) && Number.isFinite(y) ? { x, y } : null;
}

export function saveQiaobaoPosition(position) {
  if (!position) return;
  const x = Number(position.x);
  const y = Number(position.y);
  if (Number.isFinite(x) && Number.isFinite(y)) {
    uni.setStorageSync(POSITION_KEY, { x, y });
  }
}

export function getCurrentPagePath() {
  try {
    const pages = getCurrentPages();
    const current = pages[pages.length - 1];
    return current?.route || current?.$page?.fullPath?.split("?")[0] || "unknown";
  } catch (error) {
    return "unknown";
  }
}

export function isQiaobaoHidden(pagePath = getCurrentPagePath()) {
  const hiddenAll = uni.getStorageSync(GLOBAL_HIDDEN_KEY);
  const hiddenPages = uni.getStorageSync(PAGE_HIDDEN_KEY);
  return hiddenAll === true || (Array.isArray(hiddenPages) && hiddenPages.includes(pagePath));
}

export function isQiaobaoClosedForSession() {
  return sessionClosed;
}

export function closeQiaobaoForSession() {
  sessionClosed = true;
  uni.$emit("qiaobao-visibility-change", { scope: "close" });
}

export function hideQiaobaoForPage(pagePath = getCurrentPagePath(), edge = "right") {
  const hiddenPages = uni.getStorageSync(PAGE_HIDDEN_KEY);
  const nextPages = Array.isArray(hiddenPages) ? [...hiddenPages] : [];
  if (!nextPages.includes(pagePath)) nextPages.push(pagePath);
  uni.setStorageSync(PAGE_HIDDEN_KEY, nextPages);
  setQiaobaoDockEdge(edge);
  uni.$emit("qiaobao-visibility-change", { scope: "page", pagePath, edge });
}

export function hideQiaobaoGlobally(edge = "right") {
  uni.setStorageSync(GLOBAL_HIDDEN_KEY, true);
  setQiaobaoDockEdge(edge);
  uni.$emit("qiaobao-visibility-change", { scope: "all", edge });
}

export function showQiaobao(pagePath = getCurrentPagePath()) {
  uni.removeStorageSync(GLOBAL_HIDDEN_KEY);
  const hiddenPages = uni.getStorageSync(PAGE_HIDDEN_KEY);
  if (Array.isArray(hiddenPages)) {
    uni.setStorageSync(
      PAGE_HIDDEN_KEY,
      hiddenPages.filter((item) => item !== pagePath),
    );
  }
  uni.$emit("qiaobao-visibility-change", { scope: "show", pagePath });
}

export function resetQiaobaoVisibility() {
  uni.removeStorageSync(GLOBAL_HIDDEN_KEY);
  uni.removeStorageSync(PAGE_HIDDEN_KEY);
  uni.$emit("qiaobao-visibility-change", { scope: "reset" });
}