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package bndtools.release.ui;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

import org.bndtools.utils.swt.FilterPanelPart;
import org.eclipse.jface.layout.TableColumnLayout;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.CheckboxTableViewer;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.ComboBoxCellEditor;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.jface.viewers.ICheckStateProvider;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITableColorProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;

import aQute.bnd.build.ProjectBuilder;
import aQute.libg.glob.Glob;
import bndtools.release.Activator;
import bndtools.release.ProjectDiff;
import bndtools.release.nl.Messages;
import bndtools.release.ui.TableSortingEnabler.IColumnContentProvider;

public class ProjectListControl {

	private final Color				COLOR_RELEASE_REQUIRED;
	private final Color				COLOR_VERSION_UPDATE_REQUIRED;

	private Table					projects;
	private final String[]			releaseRepos;
	private CheckboxTableViewer		tableViewer;
	private final SelectionListener	selectionListener;
	private List		projectDiffs;
	private ContentProvider			contentProvider;

	private static final String		PROJECT_COLUMN		= "project";
	private static final String		REPOSITORY_COLUMN	= "repository";
	private static final String		BUNDLES_COLUMN		= "bundles";

	// Set column names
	private static final String[]	columnNames			= new String[] {
		PROJECT_COLUMN, REPOSITORY_COLUMN, BUNDLES_COLUMN
	};

	public ProjectListControl(SelectionListener selectionListener, String[] releaseRepos) {
		this.selectionListener = selectionListener;
		this.releaseRepos = releaseRepos;

		COLOR_VERSION_UPDATE_REQUIRED = new Color(Display.getCurrent(), 247, 200, 200);
		COLOR_RELEASE_REQUIRED = new Color(Display.getCurrent(), 206, 255, 206);
	}

	public void createControl(final Composite parent) {

		createFilter(parent);

		GridLayout gridLayout = new GridLayout(1, false);
		gridLayout.marginWidth = 0;

		// Create the composite
		Composite composite = new Composite(parent, SWT.NONE);
		composite.setLayout(gridLayout);
		composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		createTableLayout(composite);
		createLegend(composite);
	}

	private void createFilter(Composite parent) {

		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout gridLayout = new GridLayout(2, false);
		gridLayout.marginHeight = gridLayout.marginWidth = 0;
		gridLayout.horizontalSpacing = 0;
		gridLayout.verticalSpacing = 0;

		composite.setLayout(gridLayout);
		GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
		gridData.grabExcessHorizontalSpace = true;
		composite.setLayoutData(gridData);

		FilterPanelPart filterPart = new FilterPanelPart(Activator.getDefault()
			.getScheduler());
		filterPart.createControl(composite, 0, 0);
		filterPart.addPropertyChangeListener(event -> {
			String filter = (String) event.getNewValue();
			updatedFilter(filter);
		});

		ToolBar toolbar = new ToolBar(composite, SWT.FLAT);
		ToolItem tiCheckAll = new ToolItem(toolbar, SWT.FLAT);
		tiCheckAll.setImage(Activator.getImageDescriptor("icons/check_all.gif")
			.createImage());
		tiCheckAll.setToolTipText(Messages.checkAll);
		tiCheckAll.addSelectionListener(new SelectionAdapter() {

			@Override
			public void widgetSelected(SelectionEvent e) {
				Object[] objs = contentProvider.getElements(null);
				for (Object obj : objs) {
					ProjectDiff diff = (ProjectDiff) obj;
					diff.setRelease(true);
				}
				tableViewer.refresh();
			}
		});

		ToolItem tiUncheckAll = new ToolItem(toolbar, SWT.FLAT);
		tiUncheckAll.setImage(Activator.getImageDescriptor("icons/uncheck_all.gif")
			.createImage());
		tiUncheckAll.setToolTipText(Messages.uncheckAll);
		tiUncheckAll.addSelectionListener(new SelectionAdapter() {

			@Override
			public void widgetSelected(SelectionEvent e) {
				Object[] objs = contentProvider.getElements(null);
				for (Object obj : objs) {
					ProjectDiff diff = (ProjectDiff) obj;
					diff.setRelease(false);
				}
				tableViewer.refresh();
			}
		});
	}

	private void updatedFilter(String filterString) {
		String newFilter;
		if (filterString == null || filterString.length() == 0 || filterString.trim()
			.equals("*"))
			newFilter = null;
		else
			newFilter = "*" + filterString.trim() + "*";
		contentProvider.setFilter(newFilter);
		tableViewer.refresh();
	}

	private void createTableLayout(Composite parent) {

		Composite composite = new Composite(parent, SWT.NONE);
		composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		// Add TableColumnLayout
		TableColumnLayout layout = new TableColumnLayout();
		composite.setLayout(layout);

		// Instantiate TableViewer
		projects = new Table(composite, SWT.CHECK | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION);
		projects.setHeaderVisible(true);
		projects.setLinesVisible(true);
		projects.addSelectionListener(new SelectionListener() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				selectionListener.widgetSelected(e);
			}

			@Override
			public void widgetDefaultSelected(SelectionEvent e) {
				selectionListener.widgetDefaultSelected(e);
			}
		});
		tableViewer = new CheckboxTableViewer(projects);
		tableViewer.setUseHashlookup(true);

		// Project
		TableViewerColumn tableViewerColumn = new TableViewerColumn(tableViewer, SWT.LEFT);
		TableColumn tableCol = tableViewerColumn.getColumn();
		layout.setColumnData(tableCol, new ColumnWeightData(60, 100, true));
		tableCol.setText(Messages.project1);

		// Repository
		tableViewerColumn = new TableViewerColumn(tableViewer, SWT.LEFT);
		tableCol = tableViewerColumn.getColumn();
		layout.setColumnData(tableCol, new ColumnWeightData(26, 80, true));
		tableCol.setText(Messages.repository);
		tableViewerColumn.setEditingSupport(new InlineComboEditingSupport(tableViewer));

		// Bundles
		tableViewerColumn = new TableViewerColumn(tableViewer, SWT.CENTER);
		tableCol = tableViewerColumn.getColumn();
		layout.setColumnData(tableCol, new ColumnWeightData(14, 35, true));
		tableCol.setText(Messages.bundles);

		contentProvider = new ContentProvider();
		tableViewer.setContentProvider(contentProvider);
		tableViewer.setLabelProvider(new TableLabelProvider());
		tableViewer.setColumnProperties(columnNames);
		tableViewer.setCheckStateProvider(new ICheckStateProvider() {

			@Override
			public boolean isGrayed(Object element) {
				return false;
			}

			@Override
			public boolean isChecked(Object element) {
				ProjectDiff diff = (ProjectDiff) element;
				return diff.isRelease();
			}
		});

		projects.pack();

		TableSortingEnabler.applyTableColumnSorting(tableViewer);
	}

	private Image createSmallIcon(Display display) {
		Point[] iconSizes = display.getIconSizes();
		Point chosen = null;

		if (iconSizes.length == 0) {
			chosen = new Point(16, 16);
		} else {
			chosen = iconSizes[0];
		}

		return new Image(display, chosen.x, chosen.y);
	}

	private Image createSolidIcon(Display display, Color color) {
		Image img = createSmallIcon(display);

		GC gc = new GC(img);
		gc.setBackground(color);
		gc.fillRectangle(img.getBounds());
		gc.dispose();

		return img;
	}

	private void createLegend(Composite parent) {

		final Image updateRequiredImage = createSolidIcon(parent.getDisplay(), COLOR_VERSION_UPDATE_REQUIRED);
		final Image releaseRequiredImage = createSolidIcon(parent.getDisplay(), COLOR_RELEASE_REQUIRED);

		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout gridLayout = new GridLayout(2, false);
		gridLayout.verticalSpacing = 2;
		gridLayout.marginHeight = 2;
		gridLayout.marginWidth = 0;
		gridLayout.horizontalSpacing = 2;
		composite.setLayout(gridLayout);

		GridData gridData = new GridData(GridData.FILL_HORIZONTAL);
		gridData.grabExcessHorizontalSpace = true;
		composite.setLayoutData(gridData);

		Label l = new Label(composite, SWT.BORDER);
		l.setImage(updateRequiredImage);
		l.addDisposeListener(e -> updateRequiredImage.dispose());

		l = new Label(composite, SWT.NONE);
		l.setText(Messages.versionUpdateRequired);

		l = new Label(composite, SWT.BORDER);
		l.setImage(releaseRequiredImage);
		l.addDisposeListener(e -> releaseRequiredImage.dispose());

		l = new Label(composite, SWT.NONE);
		l.setText(Messages.releaseRequired);
	}

	public void setInput(List projectDiffs) {
		this.projectDiffs = projectDiffs;
		tableViewer.setInput(projectDiffs);
	}

	public Table getTable() {
		return projects;
	}

	public void setSelected(int index) {
		projects.select(index);
	}

	private class ContentProvider implements IStructuredContentProvider, IColumnContentProvider {

		private final AtomicReference filterRef = new AtomicReference<>();

		public void setFilter(String filter) {
			this.filterRef.set(filter);
		}

		@Override
		public void dispose() {}

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

		@Override
		public Object[] getElements(Object parent) {
			final String filter = filterRef.get();
			if (filter == null || "".equals(filter))
				return projectDiffs.toArray();

			Glob glob = new Glob(filter);
			List filtered = new ArrayList<>();
			for (ProjectDiff diff : projectDiffs) {
				if (glob.matcher(diff.getProject()
					.getName())
					.matches()) {
					filtered.add(diff);
				}
			}
			return filtered.toArray();
		}

		@Override
		public Comparable getValue(Object element, int columnIndex) {
			ProjectDiff diff = (ProjectDiff) element;
			switch (columnIndex) {
				case 0 :
					return diff.getProject()
						.getName();
				case 1 :
					return diff.getReleaseRepository();
				case 2 :
					int bundles = -1;
					try (ProjectBuilder pb = diff.getProject()
						.getBuilder(null)) {
						bundles = pb.getSubBuilders()
							.size();
					} catch (Exception e) {
						/* ignore */
					}
					return Integer.valueOf(bundles);
				default :
					return "";
			}
		}
	}

	private class TableLabelProvider extends LabelProvider implements ITableColorProvider, ITableLabelProvider {

		@Override
		public Image getColumnImage(Object element, int columnIndex) {
			return null;
		}

		@Override
		public String getColumnText(Object element, int columnIndex) {
			String text = "";
			ProjectDiff diff = (ProjectDiff) element;
			switch (columnIndex) {
				case 0 :
					text = diff.getProject()
						.getName();
					break;
				case 1 :
					text = diff.getReleaseRepository();
					if (text == null) {
						text = diff.getDefaultReleaseRepository();
					}
					break;
				case 2 :
					int bundles = -1;
					try (ProjectBuilder pb = diff.getProject()
						.getBuilder(null)) {
						bundles = pb.getSubBuilders()
							.size();
					} catch (Exception e) {
						/* ignore */
					}
					text = String.valueOf(bundles);
					break;
				default :
					break;
			}
			return text;
		}

		@Override
		public Color getBackground(Object element, int columnIndex) {
			ProjectDiff diff = (ProjectDiff) element;
			if (diff.isVersionUpdateRequired()) {
				return COLOR_VERSION_UPDATE_REQUIRED;
			}
			if (diff.isReleaseRequired()) {
				return COLOR_RELEASE_REQUIRED;
			}
			return null;
		}

		@Override
		public Color getForeground(Object element, int columnIndex) {
			return null;
		}
	}

	class InlineComboEditingSupport extends EditingSupport {

		protected ComboBoxCellEditor editor;

		public InlineComboEditingSupport(ColumnViewer viewer) {
			super(viewer);
			this.editor = new ComboBoxCellEditor((Composite) viewer.getControl(), new String[] {});

			Control control = editor.getControl();
			((CCombo) control).addSelectionListener(new SelectionListener() {
				@Override
				public void widgetSelected(SelectionEvent e) {
					editor.deactivate();
				}

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

		@Override
		protected boolean canEdit(Object element) {
			return true;
		}

		@Override
		protected CellEditor getCellEditor(Object element) {
			editor.setItems(releaseRepos);
			return editor;
		}

		@Override
		protected Object getValue(Object element) {
			return null;
			// Not needed
		}

		@Override
		protected void setValue(Object element, Object value) {
			// Not needed
		}

		@Override
		protected void initializeCellEditorValue(CellEditor cellEditor, ViewerCell cell) {

			String repository = ""; //$NON-NLS-1$
			repository = ((ProjectDiff) cell.getElement()).getReleaseRepository();
			if (repository == null) {
				repository = ((ProjectDiff) cell.getElement()).getDefaultReleaseRepository();
			}
			String[] items = ((ComboBoxCellEditor) cellEditor).getItems();
			int idx = -1;
			for (int i = 0; i < items.length; i++) {
				if (items[i].equals(repository)) {
					idx = i;
					break;
				}
			}
			if (idx > -1)
				cellEditor.setValue(idx);
			cell.setText(repository);
		}

		@Override
		protected void saveCellEditorValue(CellEditor cellEditor, ViewerCell cell) {
			int idx = ((Integer) cellEditor.getValue()).intValue();
			String[] items = ((ComboBoxCellEditor) cellEditor).getItems();

			String repository;
			if (idx > -1) {
				repository = items[idx];
			} else {
				repository = ((CCombo) cellEditor.getControl()).getText();
			}

			cell.setText(repository);
			((ProjectDiff) cell.getElement()).setReleaseRepository(repository);
		}
	}

	public void dispose() {
		COLOR_RELEASE_REQUIRED.dispose();
		COLOR_VERSION_UPDATE_REQUIRED.dispose();
	}
}