package app.updates;

import app.entities.Stats;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.net.URL;
import java.time.Instant;

@Component
public class SocialUpdater extends BaseUpdater{
    RestTemplate restTemplate;
    ObjectMapper objectMapper;
    Stats stats;

    private final Logger logger = LoggerFactory.getLogger(SocialUpdater.class);

    @Value("${backend.social.discord}")
    private String discord_url = "";

    @Value("${backend.social.vk}")
    private String vk_url;

    @Autowired
    public SocialUpdater(Stats stats) {
        restTemplate = new RestTemplate();
        objectMapper = new ObjectMapper();
        this.stats = stats;
    }

    @PostConstruct
    public void SetUpdater(){
        if(!discord_url.isEmpty()) {
            logger.warn("Discord count updater enabled");
            CreateTaskUpdater(this::UpdateDiscordCount, 5 * 60 * 1000, getClass().getName() + "_discord");
        }
        if(!vk_url.isEmpty()){
            logger.warn("VK count updater enabled");
            CreateTaskUpdater(this::UpdateVKCount, 5 * 60 * 1000, getClass().getName() + "_vk");
        }
    }

    public boolean UpdateDiscordCount(){
        try {
            logger.info("Request discord count users");
            stats.setDiscord_users(objectMapper.readTree(new URL(discord_url)).get("approximate_member_count").asInt());
            stats.getUpdates().merge("discord_count", Instant.now().getEpochSecond(), (x, y) -> y);
        } catch (IOException err) {}
        return true;
    }

    public boolean UpdateVKCount() {
        logger.info("Request vk group count users");
        try {
            int count = 0;
            String response = restTemplate.getForEntity(vk_url, String.class).getBody();
            int k_start = response.indexOf("<h3 class=\"slim_header\">") + "<h3 class=\"slim_header\">".length();
            int k_end = response.indexOf("<", k_start);
            count += Integer.valueOf(response.substring(k_start, k_end)) * 1000;
            int s_start = response.indexOf("</span>", k_end) + "</span>".length();
            int s_end = response.indexOf(" ", s_start);
            count += Integer.valueOf(response.substring(s_start, s_end));
            stats.setVk_users(count);
            stats.getUpdates().merge("vk_count", Instant.now().getEpochSecond(), (x, y) -> y);
        } catch (NumberFormatException nfe) {
            logger.error("Cannot update vk group count");
        }
        return true;
    }
}