/*****************************************************************************
 * Copyright (c) 2011 Atos Origin.
 *
 *    
 * 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:
 *  Anne Haugommard (Atos Origin) anne.haugommard@atosorigin.com - Initial API and implementation
 *
 *****************************************************************************/
package org.eclipse.gendoc.wizard;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.StringTokenizer;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.ui.dialogs.WorkspaceResourceDialog;
import org.eclipse.emf.common.util.URI;
import org.eclipse.gendoc.services.GendocServices;
import org.eclipse.gendoc.services.ILogger;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.wizard.WizardPage;
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.events.SelectionListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
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.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

public class GendocWizardPage extends WizardPage {
	/**
	 * Selected file
	 */
	private Text text;

	private Text text_1;

	private Text text_2;

	private Combo combo_1;

	private ComboViewer comboViewer_1;

	private Combo outputFormatCombo;

	private ComboViewer outputFormatComboViewer;

	private final int OFFSET = 3;

	private IFile fileForTemplate;

	private AdditionnalParametersComposite addParamsComposite;

	private Button saveButton;

	private Group grpSaveAction;

	/**
	 * Create the wizard.
	 */
	public GendocWizardPage() {
		super("wizardPage");
		setTitle("Documentation Generation (Default Generation)");

	}

	/**
	 * Create contents of the wizard.
	 * 
	 * @param parent
	 *            represent the composite passed automatically to this method by
	 *            the system
	 */
	public void createControl(Composite parent) {
		Composite container = new Composite(parent, SWT.NONE);

		setControl(container);
		container.setLayout(new GridLayout(3, false));
		
		if (getGWizard().getRunners().size() == 0){
			return;
		}
		
		if (getGWizard().getRunners().size() > 1) {
			Label lblNewLabel_4 = new Label(container, SWT.NONE);
			GridData gd_lblNewLabel_4 = new GridData(SWT.LEFT, SWT.CENTER,
					false, false, 1, 1);
			gd_lblNewLabel_4.widthHint = 89;
			lblNewLabel_4.setLayoutData(gd_lblNewLabel_4);
			lblNewLabel_4.setText(" List of templates:");
			comboViewer_1 = new ComboViewer(container, SWT.READ_ONLY);
			combo_1 = comboViewer_1.getCombo();
			GridData gd_combo_1 = new GridData(SWT.FILL, SWT.CENTER, true,
					false, 2, 1);
			gd_combo_1.widthHint = 475;
			combo_1.setLayoutData(gd_combo_1);
			combo_1.select(0);
			manageTemplateCombo(comboViewer_1);

		}

		Label lblNewLabel = new Label(container, SWT.NONE);
		lblNewLabel.setText("Selected File:");

		text = new Text(container, SWT.BORDER);
		text.setEnabled(false);
		text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));

		Label lblNewLabel_1 = new Label(container, SWT.NONE);
		lblNewLabel_1.setText("Output Format:");

		outputFormatComboViewer = new ComboViewer(container, SWT.READ_ONLY);
		outputFormatCombo = outputFormatComboViewer.getCombo();
		outputFormatCombo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER,
				true, false, 2, 1));
		Label lblNewLabel_2 = new Label(container, SWT.NONE);
		lblNewLabel_2.setText("Output Path:");
		manageCombo(outputFormatComboViewer);
		text_1 = new Text(container, SWT.BORDER);
		text_1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1,
				1));

		Button btnNewButton = new Button(container, SWT.NONE);
		btnNewButton.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false,
				false, 1, 1));
		btnNewButton.setText("browse...");

		Label lblNewLabel_3 = new Label(container, SWT.NONE);
		lblNewLabel_3.setText("File Name:");

		text_2 = new Text(container, SWT.BORDER);
		text_2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2,
				1));

		IFile[] files = getGWizard().getInputFiles();
		IGendocRunner selectedRunner = null;
		if (getGWizard().getRunners().size() == 1) {
			selectedRunner = getGWizard().getRunners().get(0);
			for (IFile f : files) {
				if (selectedRunner.getPattern().matcher(f.getName())
						.matches()) {
					fileForTemplate = f;
				}
			}
		} else {
			if (comboViewer_1 != null
					&& comboViewer_1.getSelection() instanceof StructuredSelection) {
				Object elementSelected = ((StructuredSelection) comboViewer_1
						.getSelection()).getFirstElement();
				if (elementSelected instanceof IGendocRunner) {
					selectedRunner = (IGendocRunner) elementSelected;
					for (IFile f : files) {
						if (selectedRunner.getPattern().matcher(f.getName())
								.matches()) {
							fileForTemplate = f;
						}
					}
				}
			}
		}
		StringTokenizer token = new StringTokenizer(fileForTemplate.getName(),
				".");
		String nomFile = token.nextToken();
		text.setText(fileForTemplate.getName());
		String directory = getUriText(URI.createURI(fileForTemplate
				.getLocationURI().toString()));
		directory = replacePercentBySpace(directory, OFFSET);
		text_1.setText(directory);
		text_2.setText(nomFile);

		manageListeners(outputFormatComboViewer, btnNewButton);

		// Additional parameters
		Group grpAddParams = new Group(container, SWT.SHADOW_NONE);
		grpAddParams.setText("Additionnal parameters");
		grpAddParams.setLayout(new GridLayout(1, false));
		GridData gd_grpAddParams = new GridData(SWT.FILL, SWT.FILL, false,
				true, 3, 1);
		gd_grpAddParams.widthHint = 567;
		grpAddParams.setLayoutData(gd_grpAddParams);
		addParamsComposite = new AdditionnalParametersComposite(grpAddParams);
		addParamsComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true,
				true, 1, 1));
		addParamsComposite.setInput(selectedRunner.getAdditionnalParameters());

		grpSaveAction = new Group(container, SWT.NONE);
		grpSaveAction.setText("Save Action");
		grpSaveAction.setLayout(new FormLayout());
		GridData gd_grpSaveAction = new GridData(SWT.FILL, SWT.CENTER, false,
				false, 3, 1);
		gd_grpSaveAction.widthHint = 567;
		grpSaveAction.setLayoutData(gd_grpSaveAction);

		saveButton = new Button(grpSaveAction, SWT.NONE);
		FormData fd_btnNewButton_1 = new FormData();
		fd_btnNewButton_1.left = new FormAttachment(100, -65);
		fd_btnNewButton_1.bottom = new FormAttachment(100, -3);
		fd_btnNewButton_1.right = new FormAttachment(100);
		saveButton.setLayoutData(fd_btnNewButton_1);
		saveButton.setText("Save");
		if (this.getSelected() != null) {
			this.setDescription(this.getSelected().getDescription());
		}
		saveButton.addSelectionListener(new SelectionListener() {

			public void widgetSelected(SelectionEvent e) {
				if (getSelected() != null) {
					try {
						IContainer[] result = WorkspaceResourceDialog
								.openFolderSelection(getShell(),
										"Folder Selection",
										"Select an output folder", false,
										new Object[] {}, null);
						if (result != null && result.length == 1) {
							IContainer folder = result[0];
							IFile file = folder.getFile(new Path(
									"generic_template."
											+ getSelected()
													.getOutPutExtension()));
							InputStream stream = getSelected().getTemplate()
									.openStream();
							try {
								file.create(stream, true,
										new NullProgressMonitor());
								MessageDialog
										.openInformation(getShell(),
												"Information",
												"the generic template has been saved at :\n"
														+ file.getFullPath()
																.toString());
							} catch (CoreException e1) {
								MessageDialog.openError(getShell(), "Error",
										e1.getLocalizedMessage());
							}
						}

					} catch (IOException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					}
				} else {
					setErrorMessage("Please select an output extension");
				}
			}

			public void widgetDefaultSelected(SelectionEvent e) {
			}
		});

		// Check if is a savable template
		enableSave();

		Label lblYouCanSave = new Label(grpSaveAction, SWT.NONE);
		FormData fd_lblYouCanSave = new FormData();
		fd_lblYouCanSave.top = new FormAttachment(0, 5);
		fd_lblYouCanSave.bottom = new FormAttachment(100, -7);
		fd_lblYouCanSave.left = new FormAttachment(0, 10);
		lblYouCanSave.setLayoutData(fd_lblYouCanSave);
		lblYouCanSave
				.setText("You can save the Gendoc template used for the generation to modify it :");

		if (getGWizard().getRunners().size() > 1) {
			comboViewer_1
					.addSelectionChangedListener(new ISelectionChangedListener() {
						public void selectionChanged(SelectionChangedEvent event) {
							IGendocRunner runners = GendocWizardPage.this
									.getSelectedRunner();
							GendocWizardPage.this.outputFormatComboViewer
									.setInput(runners);
							GendocWizardPage.this.outputFormatCombo.select(0);
							GendocWizardPage.this
									.setDescription(GendocWizardPage.this
											.getSelected().getDescription());
							IFile[] files = getGWizard().getInputFiles();
							if (comboViewer_1 != null
									&& comboViewer_1.getSelection() instanceof StructuredSelection) {
								Object elementSelected = ((StructuredSelection) comboViewer_1
										.getSelection()).getFirstElement();
								if (elementSelected instanceof IGendocRunner) {
									IGendocRunner runner = (IGendocRunner) elementSelected;
									for (IFile f : files) {
										if (runner.getPattern()
												.matcher(f.getName()).matches()) {
											fileForTemplate = f;
										}
									}
									addParamsComposite.setInput(runner
											.getAdditionnalParameters());
								}
							}
							GendocWizardPage.this.text.setText(fileForTemplate
									.getName());
							getGWizard().refresh();
						}
					});
		}
	}

	/**
	 * this method put all the necessary listeners to the comboviewer,
	 * btnnewButton, text_1, text_2.
	 * 
	 * @param comboViewer
	 *            the combo viewer used to output all kind of document to
	 *            generate
	 * @param btnNewButton
	 *            the btn new button that represent the browser on the wizard *
	 */
	private void manageListeners(ComboViewer comboViewer, Button btnNewButton) {
		btnNewButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				// TODO Auto-generated method stub
				IContainer[] result = WorkspaceResourceDialog
						.openFolderSelection(getShell(), "Folder Selection",
								"Select an output folder", false,
								new Object[] {}, null);
				if (result != null && result.length == 1) {
					IContainer folder = result[0];
					String repertoire = URI
							.createURI(folder.getLocationURI().toString())
							.devicePath().toString();
					repertoire = replacePercentBySpace(repertoire, OFFSET);
					text_1.setText(repertoire + "/");
					getGWizard().refresh();
				}
			}
		});

		text_1.addModifyListener(new ModifyListener() {

			public void modifyText(ModifyEvent e) {
				getGWizard().refresh();
				enableSave();
			}

		});
		text_2.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				// TODO Auto-generated method stub

				getGWizard().refresh();
			}
		});
		comboViewer
				.addSelectionChangedListener(new ISelectionChangedListener() {
					public void selectionChanged(SelectionChangedEvent event) {
						GendocWizardPage.this
								.setDescription(GendocWizardPage.this
										.getSelected().getDescription());
						getGWizard().refresh();
					}
				});

	}

	/**
	 * this method add all the necessary listeners to the comboviewer1
	 * 
	 * @param comboViewer1
	 *            the combo viewer1 that output all the possible template of
	 *            model
	 */
	private void manageTemplateCombo(ComboViewer comboViewer1) {
		comboViewer1.setContentProvider(new IStructuredContentProvider() {

			public void inputChanged(Viewer viewer, Object oldInput,
					Object newInput) {
			}

			public void dispose() {
			}

			public Object[] getElements(Object inputElement) {
				if (inputElement instanceof Collection) {
					Collection coll = (Collection) inputElement;
					return coll.toArray();
				}
				return null;
			}
		});

		comboViewer1.setLabelProvider(new ILabelProvider() {

			public void removeListener(ILabelProviderListener listener) {
			}

			public boolean isLabelProperty(Object element, String property) {
				return true;
			}

			public void dispose() {
			}

			public void addListener(ILabelProviderListener listener) {
			}

			public Image getImage(Object element) {
				return null;
			}

			public String getText(Object element) {
				if (element instanceof IGendocRunner) {
					return ((IGendocRunner) element).getLabel();
				} else {
					return null;
				}

			}
		});

		comboViewer1.setInput(getGWizard().getRunners());
		combo_1.addModifyListener(new ModifyListener() {

			public void modifyText(ModifyEvent e) {
				IGendocRunner selectedRunner = getSelectedRunner();

				if (outputFormatComboViewer != null && selectedRunner != null) {
					outputFormatComboViewer.setInput(selectedRunner);

					if (outputFormatCombo.getItemCount() > 0) {
						outputFormatCombo.select(0);
					}
				}
				getGWizard().refresh();
			}
		});
		if (combo_1.getItemCount() > 0) {
			combo_1.select(0);

		}
	}

	/**
	 * this method make all initialization of content of the comboviewer
	 * 
	 * @param comboViewer
	 */
	private void manageCombo(ComboViewer comboViewer) {
		comboViewer.setContentProvider(new IStructuredContentProvider() {

			public void inputChanged(Viewer viewer, Object oldInput,
					Object newInput) {
			}

			public void dispose() {
			}

			public Object[] getElements(Object inputElement) {
				if (inputElement instanceof IGendocRunner) {
					IGendocRunner runner = (IGendocRunner) inputElement;
					if (runner.getGendocTemplates() == null) {
						ILogger log = GendocServices.getDefault().getService(
								ILogger.class);
						log.log("runner does not have a template "
								+ runner.getLabel(), IStatus.ERROR);
						return new Object[] {};
					}
					return runner.getGendocTemplates().toArray();
				}
				return null;
			}
		});

		comboViewer.setLabelProvider(new ILabelProvider() {

			public void removeListener(ILabelProviderListener listener) {
			}

			public boolean isLabelProperty(Object element, String property) {
				return true;
			}

			public void dispose() {
			}

			public void addListener(ILabelProviderListener listener) {
			}

			public Image getImage(Object element) {
				return null;
			}

			public String getText(Object element) {
				if (element instanceof IGendocTemplate) {
					return ((IGendocTemplate) element).getOutPutExtension();
				} else {
					return null;
				}

			}
		});

		IGendocRunner selectedRunner = getSelectedRunner();

		if (selectedRunner != null) {
			comboViewer.setInput(getSelectedRunner());

		}
		outputFormatCombo.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				getGWizard().refresh();
				enableSave();
			}
		});
		if (outputFormatCombo.getItemCount() > 0) {
			outputFormatCombo.select(0);
		}
	}

	/**
	 * If is a savable template display the save group.
	 */
	private void enableSave() {
		if (this.grpSaveAction != null && getSelected() != null) {
			this.grpSaveAction.setVisible(getSelected().isSavable());
		}
	}

	/**
	 * this method give the good path in String associated to an URI
	 * 
	 * @param uri
	 *            the uri contains the path to access to the file selected
	 * @return the uri text contains the adequate access path in String
	 */
	public String getUriText(URI uri) {
		return uri.trimSegments(1).devicePath().toString() + "/";
	}

	/**
	 * @return the wizard in witch this page is added
	 */
	public GendocWizard getGWizard() {
		return (GendocWizard) getWizard();
	}

	/**
	 * @return the output path in string contained in the component text_1
	 */
	public String getOutputPath() {
		return text_1.getText();
	}

	/**
	 * @return the model name in string contained in the component text_2
	 */
	public String getModelName() {
		return text_2.getText();
	}

	/**
	 * verify if the value in the displayed in the comboviewer is a correct
	 * extension.
	 * 
	 * @return true, if is correct extension
	 */
	public boolean isCorrectExtension() {
		return (Arrays.asList(outputFormatCombo.getItems())
				.contains(outputFormatCombo.getText()));
	}

	/**
	 * this method verify that all component is filled or get a value
	 * 
	 * @return true, if successful
	 */
	public boolean allIsFilled() {
		if (combo_1 != null) {
			return ((text_1.getText().length() > 0)
					&& (text_2.getText().length() > 0) && existeTemplate() && (outputFormatCombo
					.getText().length() > 0));
		} else {
			return ((text_1.getText().length() > 0)
					&& (text_2.getText().length() > 0) && (outputFormatCombo
					.getText().length() > 0));
		}
	}

	/**
	 * this method verify if the comboviewer1 is not empty or get at least one
	 * template
	 * 
	 * @return true, if successful
	 */
	public boolean existeTemplate() {
		return (combo_1.getText().length() > 0);
	}

	/**
	 * @return the selected runner of the template selected at this time in the
	 *         comboviewer1
	 */
	public IGendocRunner getSelectedRunner() {
		
			if (getGWizard().getRunners().size() == 1) {
				return getGWizard().getRunners().get(0);
			} else if (getGWizard().getRunners().size() > 1){
				if (comboViewer_1.getSelection() instanceof IStructuredSelection) {
					IStructuredSelection select = (IStructuredSelection) comboViewer_1
							.getSelection();
					return ((IGendocRunner) select.getFirstElement());
				}
			}
//		}
		return null;
	}

	/**
	 * @return template associated to the format of document to generate, that
	 *         is selected at this time in the comboviewer
	 */
	public IGendocTemplate getSelected() {
		if (outputFormatComboViewer.getSelection() instanceof IStructuredSelection) {
			IStructuredSelection select = (IStructuredSelection) outputFormatComboViewer
					.getSelection();
			return ((IGendocTemplate) select.getFirstElement());
		}

		return null;
	}

	/**
	 * @return the full output path. It represent the good path of where to put
	 *         document to generate
	 */
	public String getFullOutputPath() {
		return text_1.getText() + text_2.getText() + "."
				+ outputFormatCombo.getText();
	}

	/**
	 * @param theString
	 *            string containing percentage caracteres
	 * @param offset
	 *            the number of characters that represent space in the system
	 * @return theString with any percentage caracter
	 */
	public String replacePercentBySpace(String theString, int offset) {
		StringBuffer buffer = new StringBuffer(theString);
		int pos = 1;
		while (theString.contains("%")) {
			pos = theString.indexOf("%"); // Position of first occurence
			theString = buffer.replace(pos, pos + offset, " ").toString();
		}
		return theString;
	}

	/**
	 * @return the path of the repository of the model selected by the user.
	 */
	public String getModel() {
		return URI.createURI(fileForTemplate.getLocationURI().toString())
				.toString().replace(".di", ".notation");
	}

	public List<AdditionnalParameterItem> getAdditionnalParameters() {
		return addParamsComposite.getAdditionnalParametersValue();
	}

}