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/*
 * Copyright 2016-2017 Axioma srl.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.holonplatform.vaadin7.components.builders;

import java.util.Set;

import com.holonplatform.core.i18n.Localizable;
import com.holonplatform.vaadin7.components.Input;
import com.holonplatform.vaadin7.components.MultiSelect;
import com.holonplatform.vaadin7.components.SingleSelect;
import com.holonplatform.vaadin7.components.ItemSet.ItemCaptionGenerator;
import com.holonplatform.vaadin7.components.ItemSet.ItemIconGenerator;
import com.vaadin.server.Resource;
import com.vaadin.shared.ui.combobox.FilteringMode;

/**
 * Base builder to create selection {@link Input}s.
 * 
 * @param  Value type
 * @param  Input type
 * @param  Selection type
 * @param  Selection items type
 * @param  Concrete builder type
 * 
 * @since 5.0.0
 */
public interface BaseSelectInputBuilder, S, ITEM, B extends BaseSelectInputBuilder>
		extends InputBuilder, BaseItemDataSourceComponentBuilder {

	/**
	 * Select UI rendering mode
	 */
	public enum RenderingMode {

			/**
			 * Renders as native select, i.e. using client browser native rendering.
			 * 
			 * This rendering mode is not suitable for multi-select mode. In this case, {@link #SELECT} will be used as
			 * fallback.
			 * 
			 */
			NATIVE_SELECT,

			/**
			 * Renders as a select field (A ComboBox for single selection mode or a ListSelect for multiple selection
			 * mode)
			 */
			SELECT,

			/**
			 * Renders as an options group (A checkbox group for single selection mode or a radio buttons group for
			 * multiple selection mode)
			 */
			OPTIONS

	}

	/**
	 * Set the item caption generator to use to display item captions.
	 * @param itemCaptionGenerator The generator to set
	 * @return this
	 */
	B itemCaptionGenerator(ItemCaptionGenerator itemCaptionGenerator);

	/**
	 * Set the item icon generator to use to display item icons.
	 * @param itemIconGenerator The generator to set
	 * @return this
	 */
	B itemIconGenerator(ItemIconGenerator itemIconGenerator);

	/**
	 * Set an explicit caption for given item.
	 * @param item Item to set the caption for (not null)
	 * @param caption Item caption (not null)
	 * @return this
	 */
	B itemCaption(ITEM item, Localizable caption);

	/**
	 * Set an explicit caption for given item.
	 * @param item Item to set the caption for (not null)
	 * @param caption Item caption
	 * @return this
	 */
	default B itemCaption(ITEM item, String caption) {
		return itemCaption(item, Localizable.builder().message(caption).build());
	}

	/**
	 * Set an explicit caption for given item.
	 * @param item Item to set the caption for (not null)
	 * @param caption Item caption
	 * @param messageCode Item caption translation code
	 * @return this
	 */
	default B itemCaption(ITEM item, String caption, String messageCode) {
		return itemCaption(item, Localizable.builder().message(caption).messageCode(messageCode).build());
	}

	/**
	 * Sets the icon for an item.
	 * @param item the item to set the icon for
	 * @param icon Item icon
	 * @return this
	 */
	B itemIcon(ITEM item, Resource icon);

	/**
	 * Single select component configurator.
	 * @param  Field type
	 * @param  Item type
	 * @param  Concrete builder type
	 */
	public interface SingleSelectConfigurator>
			extends BaseSelectInputBuilder, T, ITEM, B> {

		/**
		 * Disables the possibility to input text into the field, so the field area of the component is just used to
		 * show what is selected. If the concrete select component does not support user input, this method has no
		 * effect.
		 * @return this
		 */
		B disableTextInput();

		/**
		 * Sets whether to scroll the selected item visible (directly open the page on which it is) when opening the
		 * combo box popup or not. Only applies to select components with a suggestions popup. This requires finding the
		 * index of the item, which can be expensive in many large lazy loading containers.
		 * @param scrollToSelectedItem true to find the page with the selected item when opening the selection popup
		 * @return this
		 */
		B scrollToSelectedItem(boolean scrollToSelectedItem);

		/**
		 * Sets the suggestion pop-up's width as a CSS string. By using relative units (e.g. "50%") it's possible to set
		 * the popup's width relative to the selection component itself.
		 * 
		 * Only applies to select field with backing components supporting a suggestion popup.
		 * 
		 * @param width the suggestion pop-up width
		 * @return this
		 */
		B suggestionPopupWidth(String width);

		/**
		 * Sets the option filtering mode.
		 * 
		 * Only applies to select field with backing components supporting a suggestion popup.
		 * 
		 * @param filteringMode the filtering mode to use
		 * @return this
		 */
		B filteringMode(FilteringMode filteringMode);

	}

	/**
	 * Multi select component configurator.
	 * @param  Field type
	 * @param  Item type
	 * @param  Concrete builder type
	 */
	public interface MultiSelectConfigurator>
			extends BaseSelectInputBuilder, MultiSelect, T, ITEM, B> {

	}

}