package app.services;

import app.entities.server.Server;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.annotation.PostConstruct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

@Component
public class ServersReader {
    Stats stats;
    ObjectMapper objectMapper;

    @Autowired
    public ServersReader(Stats stats, @Value("${backend.servers_file}") String servers_path) {
        this.stats = stats;
        this.objectMapper = new ObjectMapper();

        try {
            System.out.printf("Read from: %s\n", servers_path);
            JsonNode node = this.objectMapper.readTree(new File(servers_path));
            Iterator<Map.Entry<String, JsonNode>> iterator = node.fields();
            while (iterator.hasNext()) {
                Map.Entry<String, JsonNode> server = iterator.next();
                stats.servers.put(server.getKey(), this.objectMapper.treeToValue(server.getValue(), Server.class));
            }
        } catch (IOException err) {
            System.out.printf("Cannot read servers file: %s\n", servers_path);
        }
    }
}