/*
 * 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.jmeter.gui.action;

import java.awt.event.ActionEvent;
import java.io.File;
import java.io.FileOutputStream;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Set;

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

import org.apache.commons.io.FilenameUtils;
import org.apache.jmeter.control.gui.TestFragmentControllerGui;
import org.apache.jmeter.exceptions.IllegalUserActionException;
import org.apache.jmeter.gui.GuiPackage;
import org.apache.jmeter.gui.tree.JMeterTreeNode;
import org.apache.jmeter.gui.util.FileDialoger;
import org.apache.jmeter.save.SaveService;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.TestPlan;
import org.apache.jmeter.testelement.WorkBench;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.collections.HashTree;
import org.apache.jorphan.collections.ListedHashTree;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.jorphan.util.JOrphanUtils;
import org.apache.log.Logger;

/**
 * Save the current test plan; implements:
 * Save
 * Save TestPlan As
 * Save (Selection) As
 */
public class Save implements Command {
    private static final Logger log = LoggingManager.getLoggerForClass();

    public static final String JMX_FILE_EXTENSION = ".jmx"; // $NON-NLS-1$

    private static final Set<String> commands = new HashSet<String>();

    static {
        commands.add(ActionNames.SAVE_AS); // Save (Selection) As
        commands.add(ActionNames.SAVE_AS_TEST_FRAGMENT); // Save as Test Fragment
        commands.add(ActionNames.SAVE_ALL_AS); // Save TestPlan As
        commands.add(ActionNames.SAVE); // Save
    }

    /**
     * Constructor for the Save object.
     */
    public Save() {
    }

    /**
     * Gets the ActionNames attribute of the Save object.
     *
     * @return the ActionNames value
     */
    @Override
    public Set<String> getActionNames() {
        return commands;
    }

    @Override
    public void doAction(ActionEvent e) throws IllegalUserActionException {
        HashTree subTree = null;
        boolean fullSave = false; // are we saving the whole tree?
        if (!commands.contains(e.getActionCommand())) {
            throw new IllegalUserActionException("Invalid user command:" + e.getActionCommand());
        }
        if (e.getActionCommand().equals(ActionNames.SAVE_AS)) {
            JMeterTreeNode[] nodes = GuiPackage.getInstance().getTreeListener().getSelectedNodes();
            if (nodes.length > 1){
                JMeterUtils.reportErrorToUser(
                        JMeterUtils.getResString("save_as_error"), // $NON-NLS-1$
                        JMeterUtils.getResString("save_as")); // $NON-NLS-1$
                return;
            }
            subTree = GuiPackage.getInstance().getCurrentSubTree();
        } 
        else if (e.getActionCommand().equals(ActionNames.SAVE_AS_TEST_FRAGMENT)) {
            JMeterTreeNode[] nodes = GuiPackage.getInstance().getTreeListener().getSelectedNodes();
            if(checkAcceptableForTestFragment(nodes)) {
                subTree = GuiPackage.getInstance().getCurrentSubTree();
                
                TestElement element = GuiPackage.getInstance().createTestElement(TestFragmentControllerGui.class.getName());
                HashTree hashTree = new ListedHashTree();
                HashTree tfTree = hashTree.add(new JMeterTreeNode(element, null));
                for (int i = 0; i < nodes.length; i++) {
                    tfTree.add(nodes[i]);
                }
                subTree = hashTree;
            } else {
                JMeterUtils.reportErrorToUser(
                        JMeterUtils.getResString("save_as_test_fragment_error"), // $NON-NLS-1$
                        JMeterUtils.getResString("save_as_test_fragment")); // $NON-NLS-1$
                return;
            }
        } else {
            fullSave = true;
            HashTree testPlan = GuiPackage.getInstance().getTreeModel().getTestPlan();
            // If saveWorkBench 
            JMeterTreeNode workbenchNode = (JMeterTreeNode) ((JMeterTreeNode) GuiPackage.getInstance().getTreeModel().getRoot()).getChildAt(1);
            if (((WorkBench)workbenchNode.getUserObject()).getSaveWorkBench()) {
                HashTree workbench = GuiPackage.getInstance().getTreeModel().getWorkBench();
                testPlan.add(workbench);
            }
            subTree = testPlan;
        }

        String updateFile = GuiPackage.getInstance().getTestPlanFile();
        if (!ActionNames.SAVE.equals(e.getActionCommand()) || updateFile == null) {
            JFileChooser chooser = FileDialoger.promptToSaveFile(updateFile == null ? GuiPackage.getInstance().getTreeListener()
                    .getCurrentNode().getName()
                    + JMX_FILE_EXTENSION : updateFile);
            if (chooser == null) {
                return;
            }
            updateFile = chooser.getSelectedFile().getAbsolutePath();
            // Make sure the file ends with proper extension
            if(FilenameUtils.getExtension(updateFile).equals("")) {
                updateFile = updateFile + JMX_FILE_EXTENSION;
            }
            // Check if the user is trying to save to an existing file
            File f = new File(updateFile);
            if(f.exists()) {
                int response = JOptionPane.showConfirmDialog(GuiPackage.getInstance().getMainFrame(),
                        JMeterUtils.getResString("save_overwrite_existing_file"), // $NON-NLS-1$
                        JMeterUtils.getResString("save?"),  // $NON-NLS-1$
                        JOptionPane.YES_NO_OPTION,
                        JOptionPane.QUESTION_MESSAGE);
                if (response == JOptionPane.CLOSED_OPTION || response == JOptionPane.NO_OPTION) {
                    return ; // Do not save, user does not want to overwrite
                }
            }

            if (!e.getActionCommand().equals(ActionNames.SAVE_AS)) {
                GuiPackage.getInstance().setTestPlanFile(updateFile);
            }
        }

        try {
            convertSubTree(subTree);
        } catch (Exception err) {
            log.warn("Error converting subtree "+err);
        }

        FileOutputStream ostream = null;
        try {
            ostream = new FileOutputStream(updateFile);
            SaveService.saveTree(subTree, ostream);
            if (fullSave) { // Only update the stored copy of the tree for a full save
                subTree = GuiPackage.getInstance().getTreeModel().getTestPlan(); // refetch, because convertSubTree affects it
                ActionRouter.getInstance().doActionNow(new ActionEvent(subTree, e.getID(), ActionNames.SUB_TREE_SAVED));
            }
        } catch (Throwable ex) {
            log.error("Error saving tree:", ex);
            if (ex instanceof Error){
                throw (Error) ex;
            }
            if (ex instanceof RuntimeException){
                throw (RuntimeException) ex;
            }
            throw new IllegalUserActionException("Couldn't save test plan to file: " + updateFile, ex);
        } finally {
            JOrphanUtils.closeQuietly(ostream);
        }
        GuiPackage.getInstance().updateCurrentGui();
    }

    /**
     * Check nodes does not contain a node of type TestPlan or ThreadGroup
     * @param nodes
     */
    private static final boolean checkAcceptableForTestFragment(JMeterTreeNode[] nodes) {
        for (int i = 0; i < nodes.length; i++) {
            Object userObject = nodes[i].getUserObject();
            if(userObject instanceof org.apache.jmeter.threads.ThreadGroup ||
                    userObject instanceof TestPlan) {
                return false;
            }
        }
        return true;
    }

    // package protected to allow access from test code
    void convertSubTree(HashTree tree) {
        Iterator<Object> iter = new LinkedList<Object>(tree.list()).iterator();
        while (iter.hasNext()) {
            JMeterTreeNode item = (JMeterTreeNode) iter.next();
            convertSubTree(tree.getTree(item));
            TestElement testElement = item.getTestElement(); // requires JMeterTreeNode
            tree.replace(item, testElement);
        }
    }
}
