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 * Copyright [2020-2030] [https://www.stylefeng.cn]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
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 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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
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package cn.stylefeng.roses.kernel.config.modular.listener;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.db.DbUtil;
import cn.hutool.db.Entity;
import cn.stylefeng.roses.kernel.config.ConfigContainer;
import cn.stylefeng.roses.kernel.config.api.context.ConfigContext;
import cn.stylefeng.roses.kernel.config.api.exception.ConfigException;
import cn.stylefeng.roses.kernel.config.api.exception.enums.ConfigExceptionEnum;
import cn.stylefeng.roses.kernel.config.modular.factory.SysConfigDataFactory;
import cn.stylefeng.roses.kernel.config.redis.RedisConfigContainer;
import cn.stylefeng.roses.kernel.rule.context.ApplicationPropertiesContext;
import cn.stylefeng.roses.kernel.rule.listener.ContextInitializedListener;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.context.event.ApplicationContextInitializedEvent;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;

import static cn.stylefeng.roses.kernel.config.api.exception.enums.ConfigExceptionEnum.APP_DB_CONFIG_ERROR;

/**
 * 初始化系统配置表
 * <p>
 * 当spring装配好配置后，就去数据库读constants
 * <p>
 *
 * @author stylefeng
 * @since 2020/6/6 23:39
 */
@Slf4j
public class ConfigInitListener extends ContextInitializedListener implements Ordered {

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE + 100;
    }

    @Override
    public void eventCallback(ApplicationContextInitializedEvent event) {

        // 获取environment参数
        ConfigurableEnvironment environment = event.getApplicationContext().getEnvironment();

        // 是否采用redis进行sys_config缓存的装载和读取（true/false）
        boolean redisConfigCacheEnableFlag = getRedisOpenFlag();

        if (redisConfigCacheEnableFlag) {
            // 获取Redis的相关配置
            String redisHost = environment.getProperty("spring.redis.host");
            String redisPort = environment.getProperty("spring.redis.port");
            String redisPassword = environment.getProperty("spring.redis.password");
            String dbNumber = environment.getProperty("spring.redis.database");

            // 初始化Config Api
            ConfigContext.setConfigApi(new RedisConfigContainer(redisHost, Convert.toInt(redisPort, 6379), redisPassword, Convert.toInt(dbNumber, 0)));
        } else {
            // 初始化Config Api，内存方式
            ConfigContext.setConfigApi(new ConfigContainer());
        }

        // 初始化ApplicationPropertiesContext
        ApplicationPropertiesContext.getInstance().initConfigs(environment);

        // 获取数据库连接配置
        String dataSourceUrl = environment.getProperty("spring.datasource.url");
        String dataSourceUsername = environment.getProperty("spring.datasource.username");
        String dataSourcePassword = environment.getProperty("spring.datasource.password");
        String driverClassName = environment.getProperty("spring.datasource.driver-class-name");

        // 如果有为空的配置，终止执行
        if (ObjectUtil.hasEmpty(dataSourceUrl, dataSourceUsername, dataSourcePassword)) {
            throw new ConfigException(APP_DB_CONFIG_ERROR);
        }

        Connection conn = null;
        try {
            Class.forName(driverClassName);
            assert dataSourceUrl != null;
            conn = DriverManager.getConnection(dataSourceUrl, dataSourceUsername, dataSourcePassword);

            // 获取sys_config表的数据
            List<Entity> entityList = SysConfigDataFactory.getSysConfigDataApi(dataSourceUrl).getConfigs(conn);

            // 将查询到的参数配置添加到缓存
            if (ObjectUtil.isNotEmpty(entityList)) {
                entityList.forEach(sysConfig -> ConfigContext.me().putConfig(sysConfig.getStr("config_code"), sysConfig.getStr("config_value")));
            }
        } catch (ClassNotFoundException e) {
            log.error("初始化系统配置表失败，找不到{}类 : {}", driverClassName, driverClassName);
            throw new ConfigException(ConfigExceptionEnum.CLASS_NOT_FOUND_ERROR);
        } catch (SQLException sqlException) {
            log.error("初始化系统配置表失败，执行查询语句失败", sqlException);
            throw new ConfigException(ConfigExceptionEnum.CONFIG_SQL_EXE_ERROR);
        } finally {
            DbUtil.close(conn);
        }
    }

    /**
     * 获取Redis的类标识，如果项目中有Redis的Class，则返回true
     *
     * @author fengshuonan
     * @since 2023/8/9 22:40
     */
    private boolean getRedisOpenFlag() {
        try {
            Class.forName("org.springframework.data.redis.connection.RedisConnectionFactory");
            return true;
        } catch (ClassNotFoundException e) {
            return false;
        }
    }

}
