/**
 * 终端判断：手机 / 微信优先进 H5 客户中心
 *
 * 覆盖：
 * - `?desktop=1` / `?forcePc=1`：强制网页端（调试用）
 * - `?h5=1`：强制 H5
 * - sessionStorage `oms_force_desktop` / `oms_force_h5`：同会话记忆
 */

const FORCE_DESKTOP_KEY = 'oms_force_desktop';
const FORCE_H5_KEY = 'oms_force_h5';

const MOBILE_UA_RE =
  /Android|webOS|iPhone|iPod|BlackBerry|IEMobile|Opera Mini|Mobile|Windows Phone|HarmonyOS|OpenHarmony/i;

/** 微信内这些路径用 replace，避免历史栈叠高触发底部 ← → */
const WECHAT_SPA_PATH_RE = /^\/(h5|wechat|register|track\/query)(\/|$)/;

type WeixinJSBridgeLike = {
  call: (name: string, ...args: unknown[]) => void;
};

declare global {
  interface Window {
    WeixinJSBridge?: WeixinJSBridgeLike;
  }
}

/** iPadOS 13+ 桌面 UA 伪装，用触控点辅助识别 */
function isIpadDesktopUa(ua: string): boolean {
  return /Macintosh/i.test(ua) && typeof navigator !== 'undefined' && navigator.maxTouchPoints > 1;
}

export function isWeChatBrowser(ua = typeof navigator !== 'undefined' ? navigator.userAgent : ''): boolean {
  return /MicroMessenger/i.test(ua);
}

export function isMobileUserAgent(ua = typeof navigator !== 'undefined' ? navigator.userAgent : ''): boolean {
  if (!ua) return false;
  if (MOBILE_UA_RE.test(ua)) return true;
  if (isIpadDesktopUa(ua)) return true;
  return false;
}

function readQueryFlag(key: string): string | null {
  if (typeof window === 'undefined') return null;
  try {
    return new URLSearchParams(window.location.search).get(key);
  } catch {
    return null;
  }
}

function persistForceFlagsFromQuery() {
  if (typeof sessionStorage === 'undefined') return;
  const desktop = readQueryFlag('desktop') ?? readQueryFlag('forcePc');
  const h5 = readQueryFlag('h5');
  if (desktop === '1') {
    sessionStorage.setItem(FORCE_DESKTOP_KEY, '1');
    sessionStorage.removeItem(FORCE_H5_KEY);
  }
  if (h5 === '1') {
    sessionStorage.setItem(FORCE_H5_KEY, '1');
    sessionStorage.removeItem(FORCE_DESKTOP_KEY);
  }
}

/**
 * 客户门户是否优先走 H5（手机 / 微信）
 * 管理端登录不受此影响
 */
export function preferH5Portal(): boolean {
  if (typeof window === 'undefined') return false;

  persistForceFlagsFromQuery();

  try {
    if (sessionStorage.getItem(FORCE_DESKTOP_KEY) === '1') return false;
    if (sessionStorage.getItem(FORCE_H5_KEY) === '1') return true;
  } catch {
    // ignore
  }

  const qDesktop = readQueryFlag('desktop') ?? readQueryFlag('forcePc');
  if (qDesktop === '1') return false;
  if (readQueryFlag('h5') === '1') return true;

  const ua = navigator.userAgent || '';
  if (isWeChatBrowser(ua) || isMobileUserAgent(ua)) return true;

  // 窄屏兜底（部分内嵌 WebView UA 不标准）
  try {
    if (window.matchMedia('(max-width: 768px)').matches) return true;
  } catch {
    // ignore
  }

  return false;
}

function resolveRoutePath(to: unknown): string {
  if (typeof to === 'string') {
    return to.split('?')[0].split('#')[0] || '';
  }
  if (to && typeof to === 'object' && 'path' in to) {
    const path = String((to as { path?: unknown }).path || '');
    return path.split('?')[0].split('#')[0] || '';
  }
  return '';
}

export function isWeChatSpaPath(path: string): boolean {
  return WECHAT_SPA_PATH_RE.test(path || '');
}

/**
 * 尝试隐藏微信内置工具栏（老版本微信 / 部分安卓、旧 iOS 仍会显示底部 ← →）。
 * 新版微信多数已无此栏，调用无副作用。
 */
export function hideWeChatBrowserNav(): void {
  if (typeof window === 'undefined' || !isWeChatBrowser()) return;

  const invoke = () => {
    try {
      window.WeixinJSBridge?.call('hideToolbar');
    } catch {
      // ignore
    }
  };

  if (window.WeixinJSBridge) {
    invoke();
    return;
  }

  document.addEventListener('WeixinJSBridgeReady', invoke, { once: true });
}

/**
 * H5 站内跳转：微信内用 replace，避免历史栈变长触发底部左右箭头栏。
 * 非微信仍可用 push，保留系统返回。
 */
export function h5Navigate(
  router: { push: (to: unknown) => unknown; replace: (to: unknown) => unknown },
  to: unknown,
): unknown {
  if (isWeChatBrowser()) {
    return router.replace(to);
  }
  return router.push(to);
}

let weChatHistoryGuardInstalled = false;

/**
 * 微信内将 H5/注册相关 router.push 统一改为 replace。
 * 覆盖漏网的 push（顾问跳转、登录后跳转等），从根上压住历史栈。
 */
export function installWeChatH5HistoryGuard(router: {
  push: (to: unknown) => unknown;
  replace: (to: unknown) => unknown;
}): void {
  if (weChatHistoryGuardInstalled || typeof window === 'undefined' || !isWeChatBrowser()) {
    return;
  }
  weChatHistoryGuardInstalled = true;

  const originalPush = router.push.bind(router);
  router.push = ((to: unknown) => {
    const path = resolveRoutePath(to);
    if (isWeChatSpaPath(path) || isWeChatSpaPath(window.location.pathname)) {
      return router.replace(to);
    }
    return originalPush(to);
  }) as typeof router.push;

  hideWeChatBrowserNav();
  // 部分机型 Bridge 就绪较晚，再补一次
  window.setTimeout(hideWeChatBrowserNav, 800);
  window.setTimeout(hideWeChatBrowserNav, 2000);
}