package com.ruoyi.framework.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.spring.boot3.autoconfigure.properties.DruidStatProperties;
import com.alibaba.druid.util.Utils;
import com.ruoyi.framework.config.properties.DynamicDataSourceProperties;
import jakarta.annotation.PreDestroy;
import jakarta.servlet.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * druid 配置多数据源
 *
 * @author ruoyi
 */
@Configuration
public class DruidConfig {

    @Autowired
    DynamicDataSourceProperties dataSourceProperties;

    private List<DruidDataSource> druidDataSources = new ArrayList<>();

    Logger logger = LoggerFactory.getLogger(DruidConfig.class);

    /**
     * 去除监控页面底部的广告
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Bean
    @ConditionalOnProperty(name = "spring.datasource.druid.stat-view-servlet.enabled", havingValue = "true")
    FilterRegistrationBean removeDruidFilterRegistrationBean(DruidStatProperties properties) {
        // 获取web监控页面的参数
        DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
        // 提取common.js的配置路径
        String pattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*";
        String commonJsPattern = pattern.replaceAll("\\*", "js/common.js");
        final String filePath = "support/http/resources/js/common.js";
        // 创建filter进行过滤
        Filter filter = new Filter() {
            @Override
            public void init(jakarta.servlet.FilterConfig filterConfig) throws ServletException {
            }

            @Override
            public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                    throws IOException, ServletException {
                chain.doFilter(request, response);
                // 重置缓冲区，响应头不会被重置
                response.resetBuffer();
                // 获取common.js
                String text = Utils.readFromResource(filePath);
                // 正则替换banner, 除去底部的广告信息
                text = text.replaceAll("<a.*?banner\"></a><br/>", "");
                text = text.replaceAll("powered.*?shrek.wang</a>", "");
                response.getWriter().write(text);
            }

            @Override
            public void destroy() {
            }
        };
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(filter);
        registrationBean.addUrlPatterns(commonJsPattern);
        return registrationBean;
    }

    public List<DruidDataSource> getDruidDataSources() {
        return druidDataSources;
    }

    @PreDestroy
    public void destroy() {
        for (DruidDataSource druidDataSource : druidDataSources) {
            druidDataSource.close();
        }
    }
}
