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package org.scijava.widget;

import java.util.ArrayList;
import java.util.List;

import org.scijava.AbstractContextual;
import org.scijava.convert.ConvertService;
import org.scijava.log.LogService;
import org.scijava.module.Module;
import org.scijava.module.ModuleException;
import org.scijava.module.ModuleItem;
import org.scijava.object.ObjectService;
import org.scijava.plugin.Parameter;

/**
 * Abstract superclass for {@link InputHarvester}s.
 * 
 * An input harvester obtains a module's unresolved input parameter values from
 * the user. Parameters are collected using an {@link InputPanel} dialog box.
 * 
 * 
 * @author Curtis Rueden
 * @param  The type of UI component housing the input panel itself.
 * @param  The type of UI component housing each input widget.
 */
public abstract class AbstractInputHarvester extends AbstractContextual
	implements InputHarvester
{

	@Parameter
	private LogService log;

	@Parameter
	private WidgetService widgetService;

	@Parameter
	private ObjectService objectService;

	@Parameter
	private ConvertService convertService;

	// -- InputHarvester methods --

	@Override
	public void buildPanel(final InputPanel inputPanel, final Module module)
		throws ModuleException
	{
		final Iterable> inputs = module.getInfo().inputs();

		final ArrayList models = new ArrayList<>();

		for (final ModuleItem item : inputs) {
			final WidgetModel model = addInput(inputPanel, module, item);
			if (model != null) models.add(model);
		}

		// mark all models as initialized
		for (final WidgetModel model : models)
			model.setInitialized(true);

		// compute initial preview
		module.preview();
	}

	// -- Helper methods --

	private  WidgetModel addInput(final InputPanel inputPanel,
		final Module module, final ModuleItem item) throws ModuleException
	{
		final String name = item.getName();
		final boolean resolved = module.isInputResolved(name);
		if (resolved) return null; // skip resolved inputs

		final Class type = item.getType();
		final WidgetModel model =
			widgetService.createModel(inputPanel, module, item, getObjects(type));

		final Class widgetType = inputPanel.getWidgetComponentType();
		final InputWidget widget = widgetService.create(model);
		if (widget == null) {
			log.debug("No widget found for input: " + model.getItem().getName());
		}
		if (widget != null && widget.getComponentType() == widgetType) {
			@SuppressWarnings("unchecked")
			final InputWidget typedWidget = (InputWidget) widget;
			inputPanel.addWidget(typedWidget);
			return model;
		}

		if (item.isRequired()) {
			throw new ModuleException("A " + type.getSimpleName() +
				" is required but none exist.");
		}

		// item is not required; we can skip it
		return null;
	}

	/** Asks the object service and convert service for valid choices */
	@SuppressWarnings("unchecked")
	private List getObjects(final Class type) {
		@SuppressWarnings("rawtypes")
		List compatibleInputs =
			new ArrayList(convertService.getCompatibleInputs(type));
		compatibleInputs.addAll(objectService.getObjects(type));
		return compatibleInputs;
	}

}