import { createContext, useContext, useState, useEffect, useCallback, ReactNode } from "react";
import { authService } from "@/services/auth.service";
import { clearToken } from "@/lib/api-client";
import type { User, UserRole } from "@/types/auth";

export type { UserRole };

interface AuthContextType {
  user: User | null;
  isAuthenticated: boolean;
  isLoading: boolean;
  login: (email: string, password: string) => Promise<User>;
  logout: () => Promise<void>;
}

const AuthContext = createContext<AuthContextType | undefined>(undefined);

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

  useEffect(() => {
    const token = localStorage.getItem("encoach_token");
    if (!token) {
      setIsLoading(false);
      return;
    }

    authService
      .getUser()
      .then(setUser)
      .catch(() => {
        clearToken();
      })
      .finally(() => setIsLoading(false));
  }, []);

  const login = useCallback(async (email: string, password: string): Promise<User> => {
    const res = await authService.login({ login: email, password });
    setUser(res.user);
    return res.user;
  }, []);

  const logout = useCallback(async () => {
    await authService.logout();
    setUser(null);
  }, []);

  return (
    <AuthContext.Provider
      value={{
        user,
        isAuthenticated: !!user,
        isLoading,
        login,
        logout,
      }}
    >
      {children}
    </AuthContext.Provider>
  );
}

export function useAuth() {
  const ctx = useContext(AuthContext);
  if (!ctx) throw new Error("useAuth must be used within AuthProvider");
  return ctx;
}