/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed 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 com.motorola.studio.android.wizards.monkey;

import java.util.List;

import org.eclipse.core.runtime.Status;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.DirectoryDialog;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.TabFolder;
import org.eclipse.swt.widgets.TabItem;
import org.eclipse.swt.widgets.Text;

import com.motorola.studio.android.i18n.AndroidNLS;
import com.motorola.studio.android.monkey.options.IMonkeyOptionsConstants;
import com.motorola.studio.android.monkey.options.MonkeyOption;
import com.motorola.studio.android.monkey.options.MonkeyOptionsGroup;
import com.motorola.studio.android.monkey.options.MonkeyOptionsMgt;

/**
 * DESCRIPTION:
 * <br>
 * This class implements the UI for showing all monkey options information.
 * <br>
 * It extends the AbstractPropertiesComposite so as to use its common functionalities.
 * <br>
 * RESPONSIBILITY:
 * <br>
 * - Show monkey information on the UI
 * <br>
 * COLABORATORS:
 * <br>
 * AbstractPropertiesComposite: extends this class
 * <br>
 * USAGE:
 * <br>
 * This class should be added as a regular composite whenever monkey options information is necessary to be shown and edited on the UI. 
 */
public class MonkeyOptionsComposite extends AbstractPropertiesComposite implements
        IMonkeyOptionsConstants
{
    // The widget which displays the current command line used to pass the monkey options
    private Text commandLine;

    private final int TABFOLDER_HEIGHT_HINT = 290;

    /**
     * Creates a MonkeyOptionsComposite object.
     * 
     * @param parent the parent composite
     */
    public MonkeyOptionsComposite(Composite parent, String monkeyOptions)
    {
        super(parent);

        MonkeyOptionsMgt.loadFromCommandLine(monkeyOptions);
        createUI();

        // Set context Help 
        //        PlatformUI.getWorkbench().getHelpSystem().setHelp(parent,
        //                IAndroidDeviceConstants.STARTUP_OPTIONS_HELP);
    }

    /**
     * Create widgets for monkey options
     */
    private void createUI()
    {

        Composite mainComposite = this;
        Layout mainLayout = new GridLayout();
        mainComposite.setLayout(mainLayout);

        // list of monkey options groups
        List<MonkeyOptionsGroup> monkeyOptionsGroupsList =
                MonkeyOptionsMgt.getMonkeyOptionsGroupsList();

        // list of monkey options in each group
        List<MonkeyOption> monkeyOptions = null;

        // Create Tab Folder
        final TabFolder tabFolder = new TabFolder(mainComposite, SWT.NULL);
        GridData data = new GridData(SWT.FILL, SWT.FILL, true, false);
        data.heightHint = TABFOLDER_HEIGHT_HINT;
        tabFolder.setLayoutData(data);

        /*
         * Iterate through Monkey Groups 
         */
        for (MonkeyOptionsGroup monkeyOptionGroup : monkeyOptionsGroupsList)
        {

            // Create Tab Item
            TabItem tabItem = new TabItem(tabFolder, SWT.NULL);
            tabItem.setText(monkeyOptionGroup.getTitle());
            Composite group = new Composite(tabFolder, SWT.NULL);
            group.setLayout(new GridLayout(3, false));
            group.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
            tabItem.setControl(group);

            // get monkey options in this group
            monkeyOptions = monkeyOptionGroup.getMonkeyOptions();

            /*
             * Iterate through Monkey Options in this group
             */
            for (final MonkeyOption monkeyOption : monkeyOptions)
            {

                // create a checkbox for each monkey option
                Button checkbox = new Button(group, SWT.CHECK);
                checkbox.setSelection(monkeyOption.isChecked());
                checkbox.setText(monkeyOption.getUserFriendlyName());
                checkbox.setToolTipText(monkeyOption.getName() + ": "
                        + monkeyOption.getDescription());

                monkeyOption.setCheckedWidget(checkbox);
                checkbox.addSelectionListener(new SelectionAdapter()
                {
                    @Override
                    public void widgetSelected(SelectionEvent e)
                    {
                        boolean checkedStatus = ((Button) e.widget).getSelection();
                        monkeyOption.setChecked(checkedStatus);
                        notifyCompositeChangeListeners();
                    }
                });
                GridData checkboxData = new GridData(SWT.NULL, SWT.FILL, false, false);
                checkbox.setLayoutData(checkboxData);

                // Create input fields depending on the monkey option type
                switch (monkeyOption.getType())
                {
                    case TYPE_NONE:
                        // extend checkbox area along the line
                        checkboxData.widthHint = SWT.DEFAULT;
                        checkboxData.horizontalSpan = 3;
                        checkbox.setLayoutData(checkboxData);
                        break;

                    case TYPE_TEXT:
                    case TYPE_NUMBER:
                        createWidgetsForTextOrNumberType(group, monkeyOption);
                        break;

                    case TYPE_PATH:
                        createWidgetsForPathType(group, monkeyOption);
                        break;

                    default:
                        // none

                }
            }
        }

        /* 
         * Command Line area
         */
        Composite commandLineArea = new Composite(mainComposite, SWT.NONE); // composite
        commandLineArea.setLayout(new GridLayout(2, false));
        data = new GridData(SWT.FILL, SWT.FILL, true, true);
        commandLineArea.setLayoutData(data);

        Label commandLineLabel = new Label(commandLineArea, SWT.NONE); // label
        commandLineLabel.setText(AndroidNLS.UI_MonkeyOptions_CommandLine);
        data = new GridData(SWT.FILL, SWT.FILL, false, true);
        commandLineLabel.setLayoutData(data);

        commandLine = new Text(commandLineArea, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.V_SCROLL); // text
        data = new GridData(SWT.FILL, SWT.FILL, true, true);
        commandLineArea.pack();
        data.widthHint = commandLineArea.getBounds().width - commandLineLabel.getBounds().width;
        data.heightHint = commandLineArea.getBounds().height;
        commandLine.setLayoutData(data);
        commandLine.setText(MonkeyOptionsMgt.getParamList());
        commandLine.setEditable(false);
    }

    /**
     * Create widgets to enable user to input data for fields of text or number type
     * 
     * @param parent composite where the widgets will be attached to
     * @param monkeyOption the corresponding monkey option
     */
    private void createWidgetsForTextOrNumberType(final Composite parent,
            final MonkeyOption monkeyOption)
    {
        // create input text
        if ((monkeyOption.getPreDefinedValues() == null)
                || (monkeyOption.getPreDefinedValues().size() == 0))
        {
            final Text inputText = new Text(parent, SWT.SINGLE | SWT.BORDER);
            inputText.setText(monkeyOption.getValue());
            monkeyOption.setValueWidget(inputText);
            inputText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
            inputText.addModifyListener(new ModifyListener()
            {
                public void modifyText(ModifyEvent e)
                {
                    monkeyOption.setValue(inputText.getText());
                    notifyCompositeChangeListeners();
                }
            });
        }
        // create combobox
        else
        {
            final Combo combo = new Combo(parent, SWT.READ_ONLY);
            monkeyOption.setValueWidget(combo);
            int selectedIndex = 0;
            for (String preDefinedValue : monkeyOption.getPreDefinedValues())
            {
                combo.add(preDefinedValue);
                if (monkeyOption.getValue().equals(preDefinedValue))
                {
                    combo.select(selectedIndex);
                }
                else
                {
                    selectedIndex++;
                }
            }
            combo.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
            combo.addModifyListener(new ModifyListener()
            {
                public void modifyText(ModifyEvent e)
                {
                    monkeyOption.setValue(combo.getText());
                    notifyCompositeChangeListeners();
                }
            });
        }
    }

    /**
     * Create widgets to enable user to input data for fields of path type
     * 
     * @param parent composite where the widgets will be attached to
     * @param monkeyOption the corresponding monkey option
     */
    private void createWidgetsForPathType(final Composite parent, final MonkeyOption monkeyOption)
    {
        // create input text
        final Text pathText = new Text(parent, SWT.SINGLE | SWT.BORDER);
        pathText.setText(monkeyOption.getValue());
        monkeyOption.setValueWidget(pathText);
        pathText.setLayoutData(new GridData(SWT.FILL, SWT.NULL, true, false));
        pathText.addModifyListener(new ModifyListener()
        {
            public void modifyText(ModifyEvent e)
            {
                monkeyOption.setValue(pathText.getText());
                notifyCompositeChangeListeners();
            }
        });
        // create browse button
        Button pathBrowseButton = new Button(parent, SWT.PUSH);
        pathBrowseButton.setText(AndroidNLS.UI_General_BrowseButtonLabel);
        GridData data = new GridData(SWT.NULL, SWT.NULL, false, false);
        pathBrowseButton.setLayoutData(data);
        pathBrowseButton.addSelectionListener(new SelectionAdapter()
        {
            @Override
            public void widgetSelected(SelectionEvent e)
            {
                String selectedPath = null;

                if (monkeyOption.getTypeDetails().equals(TYPE_PATH_DIR))
                {
                    DirectoryDialog directoryDialog = new DirectoryDialog(getShell(), SWT.OPEN);
                    selectedPath = directoryDialog.open();
                }
                else
                {
                    FileDialog fileDialog = new FileDialog(getShell(), SWT.OPEN);
                    String[] filterExtensions =
                    {
                        "*" + monkeyOption.getTypeDetails()
                    };
                    fileDialog.setFilterExtensions(filterExtensions);
                    selectedPath = fileDialog.open();
                }

                if (selectedPath != null)
                {
                    pathText.setText(selectedPath);
                }
            }
        });
    }

    /**
     * Update command line value
     * 
     * @see com.motorola.studio.android.emulator.device.ui.AbstractPropertiesComposite#notifyCompositeChangeListeners()
     */
    @Override
    protected void notifyCompositeChangeListeners()
    {
        commandLine.setText(MonkeyOptionsMgt.getParamList());
        super.notifyCompositeChangeListeners();
    }

    /**
     * Retrieves the error message associated to this composites current state.
     * The order of precedence of error is the same as the fields displayed on the
     * UI, which means errors on fields drawn first are shown with a higher precedence
     * than the errors of fields drawn last.
     * The instance description field is the only non required field. 
     * 
     * @return the error message, or <code>null</code> if there are no errors
     */
    @Override
    public String getErrorMessage()
    {
        String errMsg = null;
        Status status = MonkeyOptionsMgt.validate();
        if (status.getSeverity() == Status.ERROR)
        {
            errMsg = status.getMessage();
        }
        return errMsg;
    }

    /**
     * Reload the values being displayed in the UI as well as the ones 
     * in the model.
     * 
     * @param monkeyOptions commandLine the command line used to start the emulator
     */
    public void reloadValues(String commandLine)
    {
        MonkeyOptionsMgt.loadFromCommandLine(commandLine);
    }

}