package com.lf.server.helper;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import java.io.File;
import java.io.FileReader;

/**
 * JS帮助类
 *
 * @author WWW
 * @date 2024-02-29
 */
public class JsHelper {
    private final static Log log = LogFactory.getLog(JsHelper.class);

    /**
     * 调用JS方法
     */
    public static Object callJsFn(String jsFile, String function, String str) {
        try {
            // 创建 JavaScript 引擎管理器
            ScriptEngineManager manager = new ScriptEngineManager();

            // 获取 JavaScript 引擎
            ScriptEngine engine = manager.getEngineByName("javascript");

            File f = new File(jsFile);
            if (!f.exists() || f.isDirectory()) {
                return null;
            }

            FileReader reader = new FileReader(f);
            // 编译并运行 JavaScript 脚本
            engine.eval(reader);

            // 调用 JavaScript 函数
            Invocable invocable = (Invocable) engine;

            return invocable.invokeFunction(function, str);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        }
    }
}