/*
 * Copyright (c) 2019-2029, Dreamlu 卢春梦 (596392912@qq.com & www.dreamlu.net).
 * <p>
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.gnu.org/licenses/lgpl.html
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.dreamlu.mica.redis.config;

import net.dreamlu.mica.redis.ratelimiter.RedisRateLimiterAspect;
import net.dreamlu.mica.redis.ratelimiter.RedisRateLimiterClient;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;
import org.springframework.scripting.support.ResourceScriptSource;

import java.util.List;

/**
 * 基于 redis 的分布式限流自动配置
 *
 * @author L.cm
 */
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(value = "mica.redis.rate-limiter.enable")
public class RateLimiterAutoConfiguration {

	@SuppressWarnings("unchecked")
	private RedisScript<List<Long>> redisRateLimiterScript() {
		DefaultRedisScript redisScript = new DefaultRedisScript<>();
		redisScript.setScriptSource(new ResourceScriptSource(new ClassPathResource("META-INF/scripts/mica_rate_limiter.lua")));
		redisScript.setResultType(List.class);
		return redisScript;
	}

	@Bean
	@ConditionalOnMissingBean
	public RedisRateLimiterClient redisRateLimiter(StringRedisTemplate redisTemplate,
												   Environment environment) {
		RedisScript<List<Long>> redisRateLimiterScript = redisRateLimiterScript();
		return new RedisRateLimiterClient(redisTemplate, redisRateLimiterScript, environment);
	}

	@Bean
	@ConditionalOnMissingBean
	public RedisRateLimiterAspect redisRateLimiterAspect(RedisRateLimiterClient rateLimiterClient) {
		return new RedisRateLimiterAspect(rateLimiterClient);
	}
}
