/*******************************************************************************
 * 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.ui.wizards.buildpath;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.dltk.core.IBuildpathEntry;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.internal.ui.wizards.IBuildpathContainerPage;
import org.eclipse.dltk.internal.ui.wizards.IBuildpathContainerPageExtension2;
import org.eclipse.dltk.internal.ui.wizards.NewWizardMessages;
import org.eclipse.dltk.launching.ScriptRuntime;
import org.eclipse.dltk.ui.DLTKUILanguageManager;
import org.eclipse.dltk.ui.IDLTKUILanguageToolkit;
import org.eclipse.dltk.ui.util.ExceptionHandler;
import org.eclipse.dltk.ui.util.PixelConverter;
import org.eclipse.dltk.ui.wizards.IBuildpathContainerPageExtension;
import org.eclipse.jface.wizard.IWizardPage;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.swt.widgets.Shell;

public class BuildpathContainerWizard extends Wizard {

	private BuildpathContainerDescriptor fPageDesc;
	private IBuildpathEntry fEntryToEdit;

	private IBuildpathEntry[] fNewEntries;
	private IBuildpathContainerPage fContainerPage;
	private IScriptProject fCurrProject;
	private IBuildpathEntry[] fCurrBuildpath;

	private BuildpathContainerSelectionPage fSelectionWizardPage;

	/**
	 * Constructor for BuildpathContainerWizard.
	 */
	public BuildpathContainerWizard(IBuildpathEntry entryToEdit,
			IScriptProject currProject, IBuildpathEntry[] currEntries) {
		this(entryToEdit, null, currProject, currEntries);
	}

	/**
	 * Constructor for BuildpathContainerWizard.
	 */
	public BuildpathContainerWizard(BuildpathContainerDescriptor pageDesc,
			IScriptProject currProject, IBuildpathEntry[] currEntries) {
		this(null, pageDesc, currProject, currEntries);
	}

	private BuildpathContainerWizard(IBuildpathEntry entryToEdit,
			BuildpathContainerDescriptor pageDesc, IScriptProject currProject,
			IBuildpathEntry[] currEntries) {
		fEntryToEdit = entryToEdit;
		fPageDesc = pageDesc;
		fNewEntries = null;

		fCurrProject = currProject;
		fCurrBuildpath = currEntries;

		String title;
		if (entryToEdit == null) {
			title = NewWizardMessages.BuildpathContainerWizard_new_title;
		} else {
			title = NewWizardMessages.BuildpathContainerWizard_edit_title;
		}
		setWindowTitle(title);
	}

	public IBuildpathEntry[] getNewEntries() {
		return fNewEntries;
	}

	@Override
	public boolean performFinish() {
		if (fContainerPage != null) {
			if (fContainerPage.finish()) {
				if (fEntryToEdit == null
						&& fContainerPage instanceof IBuildpathContainerPageExtension2) {
					fNewEntries = ((IBuildpathContainerPageExtension2) fContainerPage)
							.getNewContainers();
				} else {
					IBuildpathEntry entry = fContainerPage.getSelection();
					fNewEntries = (entry != null)
							? new IBuildpathEntry[] { entry }
							: null;
				}
				return true;
			}
		}
		return false;
	}

	@Override
	public void addPages() {
		if (fPageDesc != null) {
			fContainerPage = getContainerPage(fPageDesc);
			addPage(fContainerPage);
		} else if (fEntryToEdit == null) { // new entry: show selection page as
			// first page
			BuildpathContainerDescriptor[] containers = BuildpathContainerDescriptor
					.getDescriptors(fCurrProject);

			fSelectionWizardPage = new BuildpathContainerSelectionPage(
					containers);
			addPage(fSelectionWizardPage);

			// add as dummy, will not be shown
			fContainerPage = new BuildpathContainerDefaultPage();
			addPage(fContainerPage);
		} else { // fPageDesc == null && fEntryToEdit != null
			BuildpathContainerDescriptor[] containers = BuildpathContainerDescriptor
					.getDescriptors();

			String type = fEntryToEdit.getPath().segment(0);
			if (type.equals(ScriptRuntime.INTERPRETER_CONTAINER)) {
				IDLTKUILanguageToolkit toolkit = DLTKUILanguageManager
						.getLanguageToolkit(this.fCurrProject);
				if (toolkit != null) {
					String interpreterContainerID = toolkit
							.getInterpreterContainerId();
					BuildpathContainerDescriptor descriptor = findDescriptorPage(
							containers, fEntryToEdit, interpreterContainerID);
					fContainerPage = getContainerPage(descriptor);
					addPage(fContainerPage);
				}
			} else {
				BuildpathContainerDescriptor descriptor = findDescriptorPage(
						containers, fEntryToEdit);
				fContainerPage = getContainerPage(descriptor);
				addPage(fContainerPage);
			}
		}
		super.addPages();
	}

	private IBuildpathContainerPage getContainerPage(
			BuildpathContainerDescriptor pageDesc) {
		IBuildpathContainerPage containerPage = null;
		if (pageDesc != null) {
			IBuildpathContainerPage page = pageDesc.getPage();
			if (page != null) {
				return page; // if page is already created, avoid double
				// initialization
			}
			try {
				containerPage = pageDesc.createPage();
			} catch (CoreException e) {
				handlePageCreationFailed(e);
				containerPage = null;
			}
		}

		if (containerPage == null) {
			containerPage = new BuildpathContainerDefaultPage();
			if (pageDesc != null) {
				pageDesc.setPage(containerPage); // avoid creation next time
			}
		}

		if (containerPage instanceof IBuildpathContainerPageExtension) {
			((IBuildpathContainerPageExtension) containerPage)
					.initialize(fCurrProject, fCurrBuildpath);
		}

		containerPage.setSelection(fEntryToEdit);
		containerPage.setWizard(this);
		return containerPage;
	}

	@Override
	public IWizardPage getNextPage(IWizardPage page) {
		if (page == fSelectionWizardPage) {

			BuildpathContainerDescriptor selected = fSelectionWizardPage
					.getSelected();
			fContainerPage = getContainerPage(selected);

			return fContainerPage;
		}
		return super.getNextPage(page);
	}

	private void handlePageCreationFailed(CoreException e) {
		String title = NewWizardMessages.BuildpathContainerWizard_pagecreationerror_title;
		String message = NewWizardMessages.BuildpathContainerWizard_pagecreationerror_message;
		ExceptionHandler.handle(e, getShell(), title, message);
	}

	private BuildpathContainerDescriptor findDescriptorPage(
			BuildpathContainerDescriptor[] containers, IBuildpathEntry entry,
			String id) {
		for (int i = 0; i < containers.length; i++) {
			if (containers[i].canEdit(entry, id)) {
				return containers[i];
			}
		}
		return null;
	}

	private BuildpathContainerDescriptor findDescriptorPage(
			BuildpathContainerDescriptor[] containers, IBuildpathEntry entry) {
		for (int i = 0; i < containers.length; i++) {
			if (containers[i].canEdit(entry)) {
				return containers[i];
			}
		}
		return null;
	}

	@Override
	public void dispose() {
		if (fSelectionWizardPage != null) {
			BuildpathContainerDescriptor[] descriptors = fSelectionWizardPage
					.getContainers();
			for (int i = 0; i < descriptors.length; i++) {
				descriptors[i].dispose();
			}
		}
		super.dispose();
	}

	@Override
	public boolean canFinish() {
		if (fSelectionWizardPage != null) {
			if (!fContainerPage.isPageComplete()) {
				return false;
			}
		}
		if (fContainerPage != null) {
			return fContainerPage.isPageComplete();
		}
		return false;
	}

	public static int openWizard(Shell shell, BuildpathContainerWizard wizard) {
		WizardDialog dialog = new WizardDialog(shell, wizard);
		PixelConverter converter = new PixelConverter(shell);
		dialog.setMinimumPageSize(converter.convertWidthInCharsToPixels(70),
				converter.convertHeightInCharsToPixels(20));
		dialog.create();
		return dialog.open();
	}

}