/*
 *      Copyright (c) 2018-2028, DreamLu All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *  Neither the name of the dreamlu.net developer nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 *  Author: DreamLu 卢春梦 (596392912@qq.com)
 */

package org.springblade.core.redis.config;

import org.springblade.core.redis.ratelimiter.RedisRateLimiterAspect;
import org.springblade.core.redis.ratelimiter.RedisRateLimiterClient;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
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
 */
@AutoConfiguration
@ConditionalOnProperty(value = "blade.redis.rate-limiter.enabled", havingValue = "true")
public class RateLimiterAutoConfiguration {

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