import axios from 'src/axios/axios';
import { jwtDecode } from 'jwt-decode';

export const getAccessTokenFromCookie = (): string | null => {
    const name = 'access_token';
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop()?.split(';').shift() || null;
    return null;
};

export const getRefreshTokenFromCookie = (): string | null => {
    const name = 'refresh_token';
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop()?.split(';').shift() || null;
    return null;
};

export interface LoginCredentials {
    memberId: string;
    password: string;
}

export interface RegisterData {
    username: string;
    email: string;
    password: string;
}

export interface AuthResponse {
    resultCode: string;
    resultMessage: string;
    resultData: string;
}

export interface DecodedToken {
    encryptedPayload: string;
    memberId: string;
    memberName: string;
    exp: number;
}

// 로그인 API
export const login = async (credentials: LoginCredentials): Promise<AuthResponse> => {
    const response = await axios.post<AuthResponse>('/auth/login', credentials);
    return response.data;
};

// 회원가입 API
export const register = async (data: RegisterData): Promise<{ message: string }> => {
    const response = await axios.post<{ message: string }>('/auth/register', data);
    return response.data;
};

// 로그아웃 API
export const logout = async (): Promise<void> => {
    await axios.post('/auth/logout');
    localStorage.removeItem('accessToken');
    localStorage.removeItem('refreshToken');
    document.cookie = 'access_token=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/';
    document.cookie = 'refresh_token=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/';
};

// 토큰이 유효한지 확인
export const isTokenValid = (token: string): boolean => {
    try {
        const decoded = jwtDecode<DecodedToken>(token);
        const currentTime = Date.now() / 1000;

        if (!decoded.exp) return false; // 만료 정보가 없으면 일단 유효하다고 판단하거나, 정책에 따라 변경 가능

        return decoded.exp > currentTime;
    } catch (error) {
        return false;
    }
};

// 토큰에서 사용자 정보 추출
export const getUserFromToken = (token: string): DecodedToken | null => {
    try {
        const decoded = jwtDecode<DecodedToken>(token);
        return decoded;
    } catch (error) {
        return null;
    }
};

// Access Token 갱신 API
export const renewAccessToken = async (refreshToken: string): Promise<AuthResponse> => {
    // Refresh Token을 Header에 담아 전송 (Authorization: Bearer <token>)
    const response = await axios.post<AuthResponse>('/auth/renewAccessToken', null, {
        headers: {
            'Authorization': `Bearer ${refreshToken}`
        }
    });
    return response.data;
};