package net.lab1024.sa.base.module.support.reload.core.thread;

import lombok.extern.slf4j.Slf4j;
import net.lab1024.sa.base.module.support.reload.core.AbstractSmartReloadCommand;
import net.lab1024.sa.base.module.support.reload.core.SmartReloadManager;
import net.lab1024.sa.base.module.support.reload.core.domain.SmartReloadItem;
import net.lab1024.sa.base.module.support.reload.core.domain.SmartReloadObject;
import net.lab1024.sa.base.module.support.reload.core.domain.SmartReloadResult;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Method;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

/**
 * reload 线程
 *
 * @Author HUOJIN
 * @Date 2015-03-02 19:11:52
 * @Email huoj@youchain56.com
 */
@Slf4j
public class SmartReloadRunnable implements Runnable {

    private AbstractSmartReloadCommand abstractSmartReloadCommand;

    private boolean isInit = false;

    public SmartReloadRunnable(AbstractSmartReloadCommand abstractSmartReloadCommand) {
        this.abstractSmartReloadCommand = abstractSmartReloadCommand;
    }

    @Override
    public void run() {
        try {
            this.doTask();
        } catch (Throwable e) {
            log.error("", e);
        }
    }

    /**
     * 检测Identifier变化，执行reload
     */
    private void doTask() {
        if (!isInit) {
            this.abstractSmartReloadCommand.init();
            isInit = true;
            return;
        }

        List<SmartReloadItem> smartReloadItemList = this.abstractSmartReloadCommand.readReloadItem();
        ConcurrentHashMap<String, String> tagIdentifierMap = this.abstractSmartReloadCommand.getTagIdentifierMap();
        for (SmartReloadItem smartReloadItem : smartReloadItemList) {
            String tag = smartReloadItem.getTag();
            String tagIdentifier = smartReloadItem.getIdentification();
            String preTagChangeIdentifier = tagIdentifierMap.get(tag);
            // 数据不一致
            if (preTagChangeIdentifier == null || !preTagChangeIdentifier.equals(tagIdentifier)) {
                this.abstractSmartReloadCommand.putIdentifierMap(tag, tagIdentifier);
                // 执行重新加载此项的动作
                SmartReloadResult smartReloadResult = this.doReload(smartReloadItem);
                this.abstractSmartReloadCommand.handleReloadResult(smartReloadResult);
            }
        }
    }

    /**
     * 方法调用
     *
     * @param smartReloadItem
     * @return
     */
    private SmartReloadResult doReload(SmartReloadItem smartReloadItem) {
        SmartReloadResult result = new SmartReloadResult();
        SmartReloadObject smartReloadObject = this.abstractSmartReloadCommand.reloadObject(smartReloadItem.getTag());
        try {
            if (smartReloadObject == null) {
                result.setResult(false);
                result.setException("不能从系统中找到对应的tag：" + smartReloadItem.getTag());
                return result;
            }

            Method method = smartReloadObject.getMethod();
            if (method == null) {
                result.setResult(false);
                result.setException("reload方法不存在");
                return result;
            }

            result.setTag(smartReloadItem.getTag());
            result.setArgs(smartReloadItem.getArgs());
            result.setIdentification(smartReloadItem.getIdentification());
            result.setResult(true);
            int paramCount = method.getParameterCount();
            if (paramCount > 1) {
                result.setResult(false);
                result.setException("reload方法" + method.getName() + "参数太多");
                return result;
            }

            if (paramCount == 0) {
                method.invoke(smartReloadObject.getReloadObject());
            } else {
                method.invoke(smartReloadObject.getReloadObject(), smartReloadItem.getArgs());
            }
        } catch (Throwable throwable) {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            throwable.printStackTrace(pw);

            result.setResult(false);
            result.setException(throwable.toString());
        }
        return result;
    }

}
