/*******************************************************************************
 * Copyright (c) 2007 Chase Technology Ltd - http://www.chasetechnology.co.uk
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Doug Satchwell (Chase Technology Ltd) - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.xsl.internal.debug.ui.actions;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.debug.ui.StringVariableSelectionDialog;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.IDialogSettings;
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.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Scrollable;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.wst.xsl.internal.debug.ui.XSLDebugUIPlugin;

public class MultipleInputDialog extends Dialog
{
	protected static final String FIELD_NAME = "FIELD_NAME"; //$NON-NLS-1$
	protected static final int TEXT = 100;
	protected static final int BROWSE = 101;
	protected static final int VARIABLE = 102;
	protected static final int COMBO = 103;

	protected Composite panel;

	protected List<FieldSummary> fieldList = new ArrayList<FieldSummary>();
	protected List<Scrollable> controlList = new ArrayList<Scrollable>();
	protected List<Validator> validators = new ArrayList<Validator>();
	protected Map<Object, Comparable> valueMap = new HashMap<Object, Comparable>();

	private final String title;

	public MultipleInputDialog(Shell shell, String title)
	{
		super(shell);
		this.title = title;
		setShellStyle(getShellStyle() | SWT.RESIZE);
	}

	@Override
	protected void configureShell(Shell shell)
	{
		super.configureShell(shell);
		if (title != null)
		{
			shell.setText(title);
		}

	}

	@Override
	protected Control createButtonBar(Composite parent)
	{
		Control bar = super.createButtonBar(parent);
		validateFields();
		return bar;
	}

	@Override
	protected Control createDialogArea(Composite parent)
	{
		Composite container = (Composite) super.createDialogArea(parent);
		// ((GridData) parent.getLayoutData()).heightHint = 400;
		// ((GridData) parent.getLayoutData()).widthHint = 400;

		container.setLayout(new GridLayout(2, false));

		GridData gd = new GridData(GridData.FILL_BOTH);
		// gd.heightHint = 200;
		container.setLayoutData(gd);

		panel = new Composite(container, SWT.NONE);
		GridLayout layout = new GridLayout(2, false);
		panel.setLayout(layout);
		panel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		for (Iterator<FieldSummary> i = fieldList.iterator(); i.hasNext();)
		{
			FieldSummary field = (FieldSummary) i.next();
			switch (field.type)
			{
				case TEXT:
					createTextField(field.name, field.initialValue, field.allowsEmpty);
					break;
				// case BROWSE:
				// createBrowseField(field.name, field.initialValue,
				// field.allowsEmpty);
				// break;
				case VARIABLE:
					createVariablesField(field.name, field.initialValue, field.allowsEmpty);
					break;
				case COMBO:
					createComboField(field.name, field.initialIndex, field.items);
					break;
			}
		}

		fieldList = null; // allow it to be gc'd
		Dialog.applyDialogFont(container);

		return container;
	}

	public void addBrowseField(String labelText, String initialValue, boolean allowsEmpty)
	{
		fieldList.add(new FieldSummary(BROWSE, labelText, initialValue, allowsEmpty));
	}

	public void addTextField(String labelText, String initialValue, boolean allowsEmpty)
	{
		fieldList.add(new FieldSummary(TEXT, labelText, initialValue, allowsEmpty));
	}

	public void addVariablesField(String labelText, String initialValue, boolean allowsEmpty)
	{
		fieldList.add(new FieldSummary(VARIABLE, labelText, initialValue, allowsEmpty));
	}

	public void addComboField(String labelText, int initialIndex, String[] items)
	{
		fieldList.add(new FieldSummary(COMBO, labelText, items, initialIndex));
	}

	protected void createTextField(String labelText, String initialValue, boolean allowEmpty)
	{
		Label label = new Label(panel, SWT.NONE);
		label.setText(labelText);
		label.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING));

		final Text text = new Text(panel, SWT.SINGLE | SWT.BORDER);
		text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		text.setData(FIELD_NAME, labelText);

		// make sure rows are the same height on both panels.
		label.setSize(label.getSize().x, text.getSize().y);

		if (initialValue != null)
		{
			text.setText(initialValue);
		}

		if (!allowEmpty)
		{
			validators.add(new Validator()
			{
				@Override
				public boolean validate()
				{
					return !text.getText().equals(""); //$NON-NLS-1$
				}
			});
			text.addModifyListener(new ModifyListener()
			{
				public void modifyText(ModifyEvent e)
				{
					validateFields();
				}
			});
		}

		controlList.add(text);
	}

	public void createVariablesField(String labelText, String initialValue, boolean allowEmpty)
	{
		Label label = new Label(panel, SWT.NONE);
		label.setText(labelText);
		label.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING));

		Composite comp = new Composite(panel, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		comp.setLayout(layout);
		comp.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		final Text text = new Text(comp, SWT.SINGLE | SWT.BORDER);
		GridData data = new GridData(GridData.FILL_HORIZONTAL);
		data.widthHint = 200;
		text.setLayoutData(data);
		text.setData(FIELD_NAME, labelText);

		// make sure rows are the same height on both panels.
		label.setSize(label.getSize().x, text.getSize().y);

		if (initialValue != null)
		{
			text.setText(initialValue);
		}

		if (!allowEmpty)
		{
			validators.add(new Validator()
			{
				@Override
				public boolean validate()
				{
					return !text.getText().equals(""); //$NON-NLS-1$
				}
			});

			text.addModifyListener(new ModifyListener()
			{
				public void modifyText(ModifyEvent e)
				{
					validateFields();
				}
			});
		}

		Button button = createButton(comp, IDialogConstants.IGNORE_ID, ActionMessages.VariablesFieldButton_Text, false);
		button.addSelectionListener(new SelectionAdapter()
		{
			@Override
			public void widgetSelected(SelectionEvent e)
			{
				StringVariableSelectionDialog dialog = new StringVariableSelectionDialog(getShell());
				int code = dialog.open();
				if (code == IDialogConstants.OK_ID)
				{
					String variable = dialog.getVariableExpression();
					if (variable != null)
					{
						text.insert(variable);
					}
				}
			}
		});

		controlList.add(text);

	}

	public void createComboField(String labelText, int initialValue, String[] items)
	{
		Label label = new Label(panel, SWT.NONE);
		label.setText(labelText);
		label.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING));

		Composite comp = new Composite(panel, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		comp.setLayout(layout);
		comp.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		final Combo combo = new Combo(comp, SWT.SINGLE | SWT.BORDER | SWT.READ_ONLY);
		// GridData data = new GridData(GridData.FILL_HORIZONTAL);
		// data.widthHint = 200;
		// combo.setLayoutData(data);

		combo.setData(FIELD_NAME, labelText);

		// make sure rows are the same height on both panels.
		label.setSize(label.getSize().x, combo.getSize().y);

		combo.setItems(items);
		combo.select(initialValue);

		controlList.add(combo);
	}

	@Override
	protected void okPressed()
	{
		for (Iterator<Scrollable> i = controlList.iterator(); i.hasNext();)
		{
			Control control = (Control) i.next();
			if (control instanceof Text)
			{
				valueMap.put(control.getData(FIELD_NAME), ((Text) control).getText());
			}
			else if (control instanceof Combo)
			{
				Combo combo = (Combo) control;
				valueMap.put(control.getData(FIELD_NAME), new Integer(combo.getSelectionIndex()));
			}
		}
		controlList = null;
		super.okPressed();
	}

	@Override
	public int open()
	{
		applyDialogFont(panel);
		return super.open();
	}

	public Object getValue(String key)
	{
		return valueMap.get(key);
	}

	public String getStringValue(String key)
	{
		return (String) getValue(key);
	}

	public int getIntValue(String key)
	{
		return ((Integer) getValue(key)).intValue();
	}

	public void validateFields()
	{
		for (Iterator<Validator> i = validators.iterator(); i.hasNext();)
		{
			Validator validator = (Validator) i.next();
			if (!validator.validate())
			{
				getButton(IDialogConstants.OK_ID).setEnabled(false);
				return;
			}
		}
		getButton(IDialogConstants.OK_ID).setEnabled(true);
	}

	private String getDialogSettingsSectionName()
	{
		return XSLDebugUIPlugin.PLUGIN_ID + ".MULTIPLE_INPUT_DIALOG"; //$NON-NLS-1$
	}

	@Override
	protected IDialogSettings getDialogBoundsSettings()
	{
		IDialogSettings settings = XSLDebugUIPlugin.getDefault().getDialogSettings();
		IDialogSettings section = settings.getSection(getDialogSettingsSectionName());
		if (section == null)
		{
			section = settings.addNewSection(getDialogSettingsSectionName());
		}
		return section;
	}

	protected class FieldSummary
	{
		int initialIndex;
		int type;
		String name;
		String initialValue;
		boolean allowsEmpty;
		String[] items;

		public FieldSummary(int type, String name, String initialValue, boolean allowsEmpty)
		{
			this.type = type;
			this.name = name;
			this.initialValue = initialValue;
			this.allowsEmpty = allowsEmpty;
		}

		public FieldSummary(int type, String name, String[] items, int initialIndex)
		{
			this.type = type;
			this.name = name;
			this.items = items;
		}
	}

	protected class Validator
	{
		boolean validate()
		{
			return true;
		}
	}

}