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package org.openjdk.jmc.flightrecorder.ui.selection;

import java.text.MessageFormat;
import java.util.List;
import java.util.stream.Stream;
import java.util.stream.Stream.Builder;

import org.openjdk.jmc.common.item.IAttribute;
import org.openjdk.jmc.common.item.IItemCollection;
import org.openjdk.jmc.common.item.IItemFilter;
import org.openjdk.jmc.common.item.ItemCollectionToolkit;
import org.openjdk.jmc.flightrecorder.ui.JfrPropertySheet;
import org.openjdk.jmc.flightrecorder.ui.messages.internal.Messages;

public class ItemBackedSelection extends FlavoredSelectionBase {

	private final IItemCollection selectedItems;

	public ItemBackedSelection(IItemCollection selectedItems, String name) {
		super(name);
		this.selectedItems = selectedItems;
	}

	@Override
	public Stream<IItemStreamFlavor> getFlavors(
		IItemFilter filter, IItemCollection items, List<IAttribute<?>> dstAttributes) {
		boolean itemsApplicableOnPage = ItemCollectionToolkit.filterIfNotNull(selectedItems, filter).hasItems();

		Builder<IItemStreamFlavor> builder = Stream.builder();

		// prio1/2: All selected items, first if they can be shown on the destination page, last otherwise
		IItemStreamFlavor selectedEventsFlavor = IItemStreamFlavor.build(MessageFormat.format(
				Messages.FLAVOR_SELECTED_EVENTS, ItemCollectionToolkit.getDescription(selectedItems)), selectedItems);

		if (itemsApplicableOnPage) {
			builder.accept(selectedEventsFlavor);
		}

		// prio2/1: Destination items with properties shared with the selected items
		IItemCollection dstItems = ItemCollectionToolkit.filterIfNotNull(items, filter);
		JfrPropertySheet.calculatePersistableFilterFlavors(selectedItems, dstItems, items, dstAttributes)
				.forEach(builder::accept);

		if (!itemsApplicableOnPage) {
			builder.accept(selectedEventsFlavor);
		}

		return builder.build();
	}
}
