package uulm.teamname.marvelous.gamelibrary.json;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.InjectableValues;
import com.fasterxml.jackson.databind.ObjectMapper;
import uulm.teamname.marvelous.gamelibrary.config.CharacterConfig;
import uulm.teamname.marvelous.gamelibrary.messages.BasicMessage;
import uulm.teamname.marvelous.gamelibrary.messages.EventMessage;

/**
 * Class that contains JSON encoding and decoding. It is initiated with the Character configuration.
 */
public class JSON {

    private final ObjectMapper mapper = new ObjectMapper();

    public JSON (CharacterConfig config) {
        // add the config to the mappers InjectableValues, where it is later accessed by the EntityDeserializer
        this.mapper.setInjectableValues(new InjectableValues
                .Std()
                .addValue("CharacterConfig", config));
    }

    /** Deserializes an incoming network message into a {@link EventMessage}.
     * @param input The JSON to deserialize
     * @return The parsed message or {@code null} if the deserialization failed
     */
    public EventMessage parse(String input) {
        EventMessage result = null;
        try {
            return mapper.readValue(input, EventMessage.class);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
            return null;
        }
    }

    /** Serializes a {@link EventMessage} into a JSON string.
     * @param input The message to serialize
     * @return The message as JSON or {@code null} if the serialization failed
     */
    public String stringify(BasicMessage input) {
        try {
            return mapper.writeValueAsString(input);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
            return null;
        }
    }
}