'use client';

import { useEffect, useState } from 'react';
import { introspectAccessToken } from '@/lib/api/auth';
import { iamUser } from '@/lib/api/iam';
import type { IamUser } from '@/lib/api/types/user';
import { useAuthStore } from '@/stores/auth-store';
import { useTenantStore } from '@/stores/tenant-store';

type UserProfileState = {
  profile: IamUser | null;
  userSub: string | null;
  loading: boolean;
  label: string;
};

function displayLabel(profile: IamUser | null, userSub: string | null, loading: boolean): string {
  if (loading) return '加载中…';
  if (profile) {
    const n = profile.real_name?.trim() || profile.user_name?.trim();
    if (n) return n;
  }
  if (userSub) return userSub.length > 12 ? `${userSub.slice(0, 10)}…` : userSub;
  return '用户';
}

/** 从 UserMenu 提取的用户资料获取逻辑 */
export function useUserProfile(): UserProfileState {
  const accessToken = useAuthStore((s) => s.accessToken);
  const [profile, setProfile] = useState<IamUser | null>(null);
  const [userSub, setUserSub] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    if (!accessToken) {
      setProfile(null);
      setUserSub(null);
      setLoading(false);
      return;
    }
    let cancelled = false;
    setLoading(true);
    setProfile(null);
    setUserSub(null);

    (async () => {
      try {
        const intro = await introspectAccessToken(accessToken);
        if (cancelled) return;
        if (!intro.active || !intro.sub) {
          setUserSub(null);
          setLoading(false);
          return;
        }
        setUserSub(intro.sub);
        try {
          const u = await iamUser.get(intro.sub);
          if (!cancelled) {
            setProfile(u);
            useTenantStore.getState().hydrateFromUserTenant(u.tenant_id);
          }
        } catch {
          if (!cancelled) setProfile(null);
        }
      } catch {
        if (!cancelled) {
          setUserSub(null);
          setProfile(null);
        }
      } finally {
        if (!cancelled) setLoading(false);
      }
    })();

    return () => {
      cancelled = true;
    };
  }, [accessToken]);

  return {
    profile,
    userSub,
    loading,
    label: displayLabel(profile, userSub, loading),
  };
}

export function avatarInitials(profile: IamUser | null, userSub: string | null): string {
  const name = profile?.real_name?.trim() || profile?.user_name?.trim();
  if (name) {
    const arr = [...name];
    if (arr.length >= 2) return (arr[0] + arr[1]).toUpperCase();
    return name.slice(0, 2).toUpperCase();
  }
  if (userSub) return userSub.replace(/-/g, '').slice(0, 2).toUpperCase() || '?';
  return '?';
}