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/*
 * Copyright (C) 2008-2023, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.service;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.github.scribejava.apis.VkontakteApi;
import com.github.scribejava.core.builder.ServiceBuilder;
import com.github.scribejava.core.model.OAuth2AccessToken;
import com.github.scribejava.core.model.OAuthRequest;
import com.github.scribejava.core.model.Response;
import com.github.scribejava.core.model.Verb;
import com.github.scribejava.core.oauth.OAuth20Service;
import jakarta.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.util.UriComponentsBuilder;

import jakarta.inject.Inject;

@Service
public class VKService {
    private static final Logger logger = LoggerFactory.getLogger("VK");
    @Value("${vk_appid:appid}")
    private String VK_APPID;
    @Value("${vk_secret:secret}")
    private String VK_SECRET;
    @Value("${ap_base_uri:http://localhost:8080/}")
    private String baseUri;
    @Inject
    private ObjectMapper jsonMapper;
    @Inject
    private UserService userService;
    private OAuth20Service vkAuthService;

    @PostConstruct
    public void init() {
        UriComponentsBuilder redirectBuilder = UriComponentsBuilder.fromUriString(baseUri);
        String redirectUri = redirectBuilder.replacePath("/_vklogin").build().toUriString();
        ServiceBuilder vkBuilder = new ServiceBuilder(VK_APPID);
        setVkAuthService(vkBuilder.apiSecret(VK_SECRET)
                .defaultScope("friends,wall,offline,groups")
                .callback(redirectUri)
                .build(VkontakteApi.instance()));
    }

    public boolean updatePremiumStatus(Integer userId) {
        var vkUser = userService.getVkTokens(userId);
        if (vkUser != null) {
            OAuth2AccessToken token = new OAuth2AccessToken(vkUser.getRight());
            OAuthRequest donRequest = new OAuthRequest(Verb.GET,
                    "https://api.vk.com/method/donut.isDon?owner_id=-67669480&v=5.131");
            getVkAuthService().signRequest(token, donRequest);
            try (Response vkResponse = getVkAuthService().execute(donRequest)) {
                if (vkResponse.isSuccessful()) {
                    logger.debug(vkResponse.getBody());
                    var response = jsonMapper.readTree(vkResponse.getBody());
                    if (response.has("response")) {
                        var isDon = response.get("response").intValue() > 0;
                        logger.debug("{} is Don: {}", vkUser.getLeft(), isDon);
                        userService.setPremium(userId, isDon);
                        return isDon;
                    } else {
                        // token is expired or does not have "groups" permissions
                        userService.updateVkToken(userId, "");
                    }
                }
            } catch (Exception e) {
                logger.error("Don request error", e);
            }
        } else {
            logger.debug("User is not connected to VK: {}", userId);
        }
        return false;
    }

    public OAuth20Service getVkAuthService() {
        return vkAuthService;
    }

    public void setVkAuthService(OAuth20Service vkAuthService) {
        this.vkAuthService = vkAuthService;
    }
}