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package {{package}}.redis.template.helper;

import java.time.Duration;
import org.reactivecommons.utils.ObjectMapper;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import java.lang.reflect.ParameterizedType;
import java.util.function.Function;

public abstract class TemplateAdapterOperations {
    private final RedisTemplate template;
    private final Class dataClass;
    protected ObjectMapper mapper;
    private final Function toEntityFn;

    @SuppressWarnings("unchecked")
    protected TemplateAdapterOperations(RedisConnectionFactory connectionFactory, ObjectMapper mapper, Function toEntityFn) {
        this.mapper = mapper;
        ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass();
        this.dataClass = (Class) genericSuperclass.getActualTypeArguments()[2];
        this.toEntityFn = toEntityFn;

        template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        template.setDefaultSerializer(new Jackson2JsonRedisSerializer<>(dataClass));
        template.afterPropertiesSet();
    }

    public E save(K key, E entity) {
        template.opsForValue().set(key, toValue(entity));
        return entity;
    }

    public E save(K key, E entity, long expirationMillis) {
        E result = save(key, entity);
        template.expire(key, Duration.ofMillis(expirationMillis));
        return result;
    }

    public E findById(K key) {
        return toEntity(template.opsForValue().get(key));
    }

    protected V toValue(E entity) {
        return mapper.map(entity, dataClass);
    }

    protected E toEntity(V data) {
        return data != null ? toEntityFn.apply(data) : null;
    }

}