package com.yunhai.bschclassmanage.config;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.support.spring.FastJsonRedisSerializer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.time.Duration;

/**
 * @author min
 * @description
 * @date 2019-07-06
 */
@Slf4j
@Configuration
@EnableCaching
// 自动配置
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
public class RedisConfig extends CachingConfigurerSupport {

    /**
     *  设置 redis 数据默认过期时间，默认1天
     *  设置@cacheable 序列化方式
     * @return
     */
    @Bean
    public RedisCacheConfiguration redisCacheConfiguration(){
        FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<>(Object.class);
        RedisCacheConfiguration configuration = RedisCacheConfiguration.defaultCacheConfig();
        configuration = configuration.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(fastJsonRedisSerializer)).entryTtl(Duration.ofDays(1));
        return configuration;
    }

    @Bean(name = "redisTemplate")
    @ConditionalOnMissingBean(name = "redisTemplate")
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();

        // 使用 FastJsonRedisSerializer（会自动存储 @type 字段）
        FastJsonRedisSerializer<Object> fastJsonSerializer = new FastJsonRedisSerializer<>(Object.class);
        // 允许反序列化 com.bestsch 包下的类（安全）
        ParserConfig.getGlobalInstance().addAccept("com.bestsch");

        template.setValueSerializer(fastJsonSerializer);
        template.setHashValueSerializer(fastJsonSerializer);
        // key 使用 String 序列化
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setConnectionFactory(redisConnectionFactory);

        log.info("RedisTemplate value serializer: {}", fastJsonSerializer.getClass());
        return template;
    }

    /**
     * 自定义缓存key生成策略
     * 使用方法 @Cacheable(keyGenerator="keyGenerator")
     * @return
     */
    @Bean
    @Override
    public KeyGenerator keyGenerator() {
        return (target, method, params) -> {
            StringBuilder sb = new StringBuilder();
            sb.append(target.getClass().getName());
            sb.append(method.getName());
            for (Object obj : params) {
                sb.append(JSON.toJSONString(obj).hashCode());
            }
            return sb.toString();
        };
    }
}