"use client";

import { createContext, useContext, useState, useEffect, useCallback } from "react";
import { useRouter, usePathname } from "next/navigation";

interface User {
  id: string;
  email: string;
  name: string | null;
  isAdmin: boolean;
}

interface AuthContextType {
  user: User | null;
  isLoading: boolean;
  logout: () => Promise<void>;
  refresh: () => Promise<void>;
}

const AuthContext = createContext<AuthContextType>({
  user: null,
  isLoading: true,
  logout: async () => {},
  refresh: async () => {},
});

export function useAuth() {
  return useContext(AuthContext);
}

const PUBLIC_PATHS = ["/login", "/register"];

export function AuthProvider({ children }: { children: React.ReactNode }) {
  const [user, setUser] = useState<User | null>(null);
  const [isLoading, setIsLoading] = useState(true);
  const router = useRouter();
  const pathname = usePathname();

  const fetchUser = useCallback(async () => {
    try {
      const res = await fetch("/api/auth/me");
      const data = await res.json();
      setUser(data.user);
      return data.user;
    } catch {
      setUser(null);
      return null;
    } finally {
      setIsLoading(false);
    }
  }, []);

  useEffect(() => {
    fetchUser().then((user) => {
      if (!user && !PUBLIC_PATHS.includes(pathname)) {
        router.push("/login");
      }
    });
  }, [fetchUser, pathname, router]);

  const logout = async () => {
    try {
      await fetch("/api/auth/logout", { method: "POST" });
      setUser(null);
      router.push("/login");
    } catch {
      // Ignore errors
    }
  };

  const refresh = async () => {
    await fetchUser();
  };

  // Show nothing while checking auth on protected pages
  if (isLoading && !PUBLIC_PATHS.includes(pathname)) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <div className="animate-pulse text-muted">Loading...</div>
      </div>
    );
  }

  return (
    <AuthContext.Provider value={{ user, isLoading, logout, refresh }}>
      {children}
    </AuthContext.Provider>
  );
}