/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.debug.ui.interpreters;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IStatusHandler;
import org.eclipse.dltk.core.IBuildpathEntry;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.core.environment.EnvironmentManager;
import org.eclipse.dltk.core.environment.IEnvironment;
import org.eclipse.dltk.debug.ui.ScriptDebugImages;
import org.eclipse.dltk.internal.ui.wizards.IBuildpathContainerPage;
import org.eclipse.dltk.ui.wizards.IBuildpathContainerPageExtension;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;

/**
 * Extension to allow a user to associate a InterpreterEnvironment with a Script
 * project.
 */
public abstract class AbstractInterpreterContainerWizardPage extends WizardPage
		implements IBuildpathContainerPage, IBuildpathContainerPageExtension {

	/**
	 * The buildpath entry to be created.
	 */
	private IBuildpathEntry fSelection;

	/**
	 * InterpreterEnvironment control
	 */
	private AbstractInterpreterComboBlock fInterpreterBlock;

	private IScriptProject scriptProject;

	private IBuildpathEntry[] currentEntries;

	/**
	 * Constructs a new page.
	 */
	public AbstractInterpreterContainerWizardPage() {
		super(InterpretersMessages.InterpreterContainerWizardPage_Interpreter_System_Library_1);
	}

	@Override
	public boolean finish() {
		IStatus status = fInterpreterBlock.getStatus();
		if (!status.isOK()) {
			return false;
		}
		fSelection = fInterpreterBlock.getEntry();
		return true;
	}

	@Override
	public IBuildpathEntry getSelection() {
		return fSelection;
	}

	@Override
	public void setSelection(IBuildpathEntry containerEntry) {
		fSelection = containerEntry;
		initializeFromSelection();
	}

	/**
	 * Initlaizes the InterpreterEnvironment selection
	 */
	protected void initializeFromSelection() {
		if (getControl() != null) {
			if (fSelection == null) {
				fInterpreterBlock.setUseDefaultInterpreter();
			} else {
				fInterpreterBlock.setPath(fSelection.getPath());
			}
			IStatus status = fInterpreterBlock.getStatus();
			if (!status.isOK()) {
				setErrorMessage(status.getMessage());
				try {
					IStatusHandler handler = DebugPlugin.getDefault()
							.getStatusHandler(status);
					if (handler != null) {
						Boolean b = (Boolean) handler.handleStatus(status,
								this);
						if (b.booleanValue()) {
							fInterpreterBlock.refreshInterpreters();
						}
					}
				} catch (CoreException e) {
				}
			}
		}
	}

	/**
	 * @since 2.0
	 */
	protected AbstractInterpreterComboBlock createInterpreterBlock(
			IInterpreterComboBlockContext context) {
		return new AbstractInterpreterComboBlock(context);
	}

	@Override
	public void createControl(Composite parent) {
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		composite.setLayout(layout);
		GridData gd = new GridData(GridData.FILL_BOTH);
		composite.setLayoutData(gd);
		composite.setFont(parent.getFont());
		final IInterpreterComboBlockContext context = createInterpreterBlockHost();
		fInterpreterBlock = createInterpreterBlock(context);
		fInterpreterBlock.setDefaultInterpreterDescriptor(
				new BuildInterpreterDescriptor(context));
		fInterpreterBlock.setTitle(
				InterpretersMessages.InterpreterContainerWizardPage_3);
		fInterpreterBlock.createControl(composite);
		// gd = new GridData(GridData.FILL_HORIZONTAL);
		// fInterpreterEnvironmentBlock.getControl().setLayoutData(gd);
		setControl(composite);
		fInterpreterBlock.addPropertyChangeListener(event -> {
			IStatus status = fInterpreterBlock.getStatus();
			if (status.isOK()) {
				setErrorMessage(null);
			} else {
				setErrorMessage(status.getMessage());
			}
		});

		setTitle(
				InterpretersMessages.InterpreterContainerWizardPage_Interpreter_System_Library_1);
		setMessage(
				InterpretersMessages.InterpreterContainerWizardPage_Select_the_Interpreter_used_to_build_this_project__4);

		initializeFromSelection();
	}

	/**
	 * @return
	 */
	private IInterpreterComboBlockContext createInterpreterBlockHost() {
		return new IInterpreterComboBlockContext() {

			@Override
			public int getMode() {
				return M_BUILDPATH;
			}

			@Override
			public IEnvironment getEnvironment() {
				return EnvironmentManager.getEnvironment(getScriptProject());
			}

			@Override
			public String getNatureId() {
				return AbstractInterpreterContainerWizardPage.this
						.getScriptNature();
			}

		};
	}

	@Override
	public Image getImage() {
		return ScriptDebugImages.get(ScriptDebugImages.IMG_WIZBAN_LIBRARY);
	}

	@Override
	public void initialize(IScriptProject project,
			IBuildpathEntry[] currentEntries) {
		this.scriptProject = project;
		this.currentEntries = currentEntries;
	}

	public IScriptProject getScriptProject() {
		return this.scriptProject;
	}

	public IBuildpathEntry[] getCurrentEntries() {
		return this.currentEntries;
	}

	/**
	 * @since 2.0
	 */
	public abstract String getScriptNature();
}