"use client";

import { useRouter } from "next/navigation";
import * as React from "react";
import { toast } from "sonner";
import { AuthService } from "@/services/auth.service";
import { UserService } from "@/services/user.service";
import type { LoginResponse, RegisterPayload } from "@/types/auth";
import type { User } from "@/types/user";

interface AuthContextType {
	user: User | null;
	isLoading: boolean;
	isAuthenticated: boolean;
	login: (email: string, password: string) => Promise<LoginResponse>;
	verify2fa: (userId: string, token: string) => Promise<void>;
	register: (payload: RegisterPayload) => Promise<void>;
	logout: () => Promise<void>;
	refreshUser: () => Promise<void>;
}

const AuthContext = React.createContext<AuthContextType | null>(null);

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

	const refreshUser = React.useCallback(async () => {
		// Éviter de lancer plusieurs refresh en même temps
		if (!isLoading) setIsLoading(true);
		try {
			const userData = await UserService.getMe();
			setUser(userData);
		} catch (_error) {
			setUser(null);
		} finally {
			setIsLoading(false);
		}
	}, [isLoading]);

	React.useEffect(() => {
		let isMounted = true;
		const initAuth = async () => {
			try {
				const userData = await UserService.getMe();
				if (isMounted) setUser(userData);
			} catch (_error) {
				if (isMounted) setUser(null);
			} finally {
				if (isMounted) setIsLoading(false);
			}
		};

		initAuth();
		return () => {
			isMounted = false;
		};
	}, []);

	const login = async (email: string, password: string) => {
		try {
			const response = await AuthService.login(email, password);
			if (response.userId && response.message === "Please provide 2FA token") {
				return response;
			}
			await refreshUser();
			toast.success("Connexion réussie !");
			router.push("/");
			return response;
		} catch (error: unknown) {
			let errorMessage = "Erreur de connexion";
			if (
				error &&
				typeof error === "object" &&
				"response" in error &&
				error.response &&
				typeof error.response === "object" &&
				"data" in error.response &&
				error.response.data &&
				typeof error.response.data === "object" &&
				"message" in error.response.data &&
				typeof error.response.data.message === "string"
			) {
				errorMessage = error.response.data.message;
			}
			toast.error(errorMessage);
			throw error;
		}
	};

	const verify2fa = async (userId: string, token: string) => {
		try {
			await AuthService.verify2fa(userId, token);
			await refreshUser();
			toast.success("Connexion réussie !");
			router.push("/");
		} catch (error: unknown) {
			let errorMessage = "Code 2FA invalide";
			if (
				error &&
				typeof error === "object" &&
				"response" in error &&
				error.response &&
				typeof error.response === "object" &&
				"data" in error.response &&
				error.response.data &&
				typeof error.response.data === "object" &&
				"message" in error.response.data &&
				typeof error.response.data.message === "string"
			) {
				errorMessage = error.response.data.message;
			}
			toast.error(errorMessage);
			throw error;
		}
	};

	const register = async (payload: RegisterPayload) => {
		try {
			await AuthService.register(payload);
			toast.success(
				"Inscription réussie ! Vous pouvez maintenant vous connecter.",
			);
			router.push("/login");
		} catch (error: unknown) {
			let errorMessage = "Erreur d'inscription";
			if (
				error &&
				typeof error === "object" &&
				"response" in error &&
				error.response &&
				typeof error.response === "object" &&
				"data" in error.response &&
				error.response.data &&
				typeof error.response.data === "object" &&
				"message" in error.response.data &&
				typeof error.response.data.message === "string"
			) {
				errorMessage = error.response.data.message;
			}
			toast.error(errorMessage);
			throw error;
		}
	};

	const logout = async () => {
		try {
			await AuthService.logout();
			setUser(null);
			toast.success("Déconnexion réussie");
			router.push("/");
		} catch (_error) {
			toast.error("Erreur lors de la déconnexion");
		}
	};

	return (
		<AuthContext.Provider
			value={{
				user,
				isLoading,
				isAuthenticated: !!user,
				login,
				verify2fa,
				register,
				logout,
				refreshUser,
			}}
		>
			{children}
		</AuthContext.Provider>
	);
}

export const useAuth = () => {
	const context = React.useContext(AuthContext);
	if (!context) {
		throw new Error("useAuth must be used within an AuthProvider");
	}
	return context;
};