/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  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
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.shell;

import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.EXIT_CODE_FAILURE;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.plugin.task.api.AbstractTask;
import org.apache.dolphinscheduler.plugin.task.api.ShellCommandExecutor;
import org.apache.dolphinscheduler.plugin.task.api.TaskCallBack;
import org.apache.dolphinscheduler.plugin.task.api.TaskException;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;
import org.apache.dolphinscheduler.plugin.task.api.model.Property;
import org.apache.dolphinscheduler.plugin.task.api.model.TaskResponse;
import org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParamUtils;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParameterUtils;
import org.apache.dolphinscheduler.plugin.task.api.utils.FileUtils;

import org.apache.commons.lang3.SystemUtils;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.Map;

/**
 * shell task
 */
public class ShellTask extends AbstractTask {

    /**
     * shell parameters
     */
    private ShellParameters shellParameters;

    /**
     * shell command executor
     */
    private ShellCommandExecutor shellCommandExecutor;

    /**
     * taskExecutionContext
     */
    private TaskExecutionContext taskExecutionContext;

    /**
     * constructor
     *
     * @param taskExecutionContext taskExecutionContext
     */
    public ShellTask(TaskExecutionContext taskExecutionContext) {
        super(taskExecutionContext);

        this.taskExecutionContext = taskExecutionContext;
        this.shellCommandExecutor = new ShellCommandExecutor(this::logHandle,
                taskExecutionContext,
                logger);
    }

    @Override
    public void init() {
        logger.info("shell task params {}", taskExecutionContext.getTaskParams());

        shellParameters = JSONUtils.parseObject(taskExecutionContext.getTaskParams(), ShellParameters.class);

        if (!shellParameters.checkParameters()) {
            throw new RuntimeException("shell task params is not valid");
        }
    }

    @Override
    public void handle(TaskCallBack taskCallBack) throws TaskException {
        try {
            // construct process
            String command = buildCommand();
            TaskResponse commandExecuteResult = shellCommandExecutor.run(command);
            setExitStatusCode(commandExecuteResult.getExitStatusCode());
            setProcessId(commandExecuteResult.getProcessId());
            shellParameters.dealOutParam(shellCommandExecutor.getVarPool());
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            logger.error("The current Shell task has been interrupted", e);
            setExitStatusCode(EXIT_CODE_FAILURE);
            throw new TaskException("The current Shell task has been interrupted", e);
        } catch (Exception e) {
            logger.error("shell task error", e);
            setExitStatusCode(EXIT_CODE_FAILURE);
            throw new TaskException("Execute shell task error", e);
        }
    }

    @Override
    public void cancel() throws TaskException {
        // cancel process
        try {
            shellCommandExecutor.cancelApplication();
        } catch (Exception e) {
            throw new TaskException("cancel application error", e);
        }
    }

    /**
     * create command
     *
     * @return file name
     * @throws Exception exception
     */
    private String buildCommand() throws Exception {
        // generate scripts
        String fileName = String.format("%s/%s_node.%s",
                taskExecutionContext.getExecutePath(),
                taskExecutionContext.getTaskAppId(), SystemUtils.IS_OS_WINDOWS ? "bat" : "sh");

        File file = new File(fileName);
        Path path = file.toPath();

        if (Files.exists(path)) {
            // this shouldn't happen
            logger.warn("The command file: {} is already exist", path);
            return fileName;
        }

        String script = shellParameters.getRawScript().replaceAll("\\r\\n", System.lineSeparator());
        script = parseScript(script);
        shellParameters.setRawScript(script);

        logger.info("raw script : {}", shellParameters.getRawScript());
        logger.info("task execute path : {}", taskExecutionContext.getExecutePath());

        FileUtils.createFileWith755(path);
        Files.write(path, shellParameters.getRawScript().getBytes(), StandardOpenOption.APPEND);

        return fileName;
    }

    @Override
    public AbstractParameters getParameters() {
        return shellParameters;
    }

    private String parseScript(String script) {
        // combining local and global parameters
        Map<String, Property> paramsMap = taskExecutionContext.getPrepareParamsMap();
        return ParameterUtils.convertParameterPlaceholders(script, ParamUtils.convert(paramsMap));
    }
}
