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package com.sun.javafx.scene.control.skin;

import com.sun.javafx.scene.control.behavior.CellBehaviorBase;
import javafx.beans.InvalidationListener;
import javafx.beans.WeakInvalidationListener;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ReadOnlyDoubleProperty;
import javafx.scene.control.IndexedCell;
import javafx.scene.shape.Rectangle;

public abstract class TableCellSkinBase<C extends IndexedCell, B extends CellBehaviorBase<C>> extends CellSkinBase<C,B> {

    /***************************************************************************
     *                                                                         *
     * Static Fields                                                           *
     *                                                                         *
     **************************************************************************/

    // This property is set on the cell when we want to know its actual
    // preferred width, not the width of the associated TableColumn.
    // This is primarily used in NestedTableColumnHeader such that user double
    // clicks result in the column being resized to fit the widest content in
    // the column
    static final String DEFER_TO_PARENT_PREF_WIDTH = "deferToParentPrefWidth";



    /***************************************************************************
     *                                                                         *
     * Private Fields                                                          *
     *                                                                         *
     **************************************************************************/

    // Equivalent to tableColumn.widthProperty()
    protected abstract ReadOnlyDoubleProperty columnWidthProperty();

    // Equivalent to tableColumn.visibleProperty()
    protected abstract BooleanProperty columnVisibleProperty();

    boolean isDeferToParentForPrefWidth = false;



    /***************************************************************************
     *                                                                         *
     * Constructors                                                            *
     *                                                                         *
     **************************************************************************/

    public TableCellSkinBase(final C control, final B behavior) {
        super(control, behavior);

        // init(control) should not be called here - it should be called by the
        // subclass after initialising itself. This is to prevent NPEs (for
        // example, getVisibleLeafColumns() throws a NPE as the control itself
        // is not yet set in subclasses).
    }

    protected void init(C control) {
        // RT-22038
        Rectangle clip = new Rectangle();
        clip.widthProperty().bind(control.widthProperty());
        clip.heightProperty().bind(control.heightProperty());
        getSkinnable().setClip(clip);
        // --- end of RT-22038

        ReadOnlyDoubleProperty columnWidthProperty = columnWidthProperty();
        if (columnWidthProperty != null) {
            columnWidthProperty.addListener(weakColumnWidthListener);
        }

        registerChangeListener(control.visibleProperty(), "VISIBLE");

        if (control.getProperties().containsKey(DEFER_TO_PARENT_PREF_WIDTH)) {
            isDeferToParentForPrefWidth = true;
        }
    }



    /***************************************************************************
     *                                                                         *
     * Listeners                                                               *
     *                                                                         *
     **************************************************************************/

    private InvalidationListener columnWidthListener = valueModel -> {
        getSkinnable().requestLayout();
    };

    private WeakInvalidationListener weakColumnWidthListener =
            new WeakInvalidationListener(columnWidthListener);



    /***************************************************************************
     *                                                                         *
     * Public Methods                                                          *
     *                                                                         *
     **************************************************************************/

    @Override protected void handleControlPropertyChanged(String p) {
        super.handleControlPropertyChanged(p);
        if ("VISIBLE".equals(p)) {
            getSkinnable().setVisible(columnVisibleProperty().get());
        }
    }

    @Override public void dispose() {
        ReadOnlyDoubleProperty columnWidthProperty = columnWidthProperty();
        if (columnWidthProperty != null) {
            columnWidthProperty.removeListener(weakColumnWidthListener);
        }

        super.dispose();
    }

    @Override protected void layoutChildren(final double x, final double y,
            final double w, final double h) {
        // fit the cell within this space
        // FIXME the subtraction of bottom padding isn't right here - but it
        // results in better visuals, so I'm leaving it in place for now.
        layoutLabelInArea(x, y, w, h - getSkinnable().getPadding().getBottom());
    }

    @Override protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
        if (isDeferToParentForPrefWidth) {
            return super.computePrefWidth(height, topInset, rightInset, bottomInset, leftInset);
        }
        return columnWidthProperty().get();
    }
}