package gu.dtalk;

import static com.google.common.base.Preconditions.*;

import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.List;

import com.google.common.base.Throwables;

/**
 * 菜单条目构造器
 * @author guyadong
 *
 * @param <T> 菜单条目子类类型
 */
public class ItemBuilder<T extends BaseItem> {

	protected final T item;
	public ItemBuilder(T item) {
		super();
		this.item = item;
	}
	public ItemBuilder<T> name(String name) {
		item.setName(name);
		return this;
	}

	public ItemBuilder<T> disable(boolean disable) {
		item.setDisable(disable);
		return this;
	}
	public ItemBuilder<T> disable() {
		return disable(true);
	}
	public ItemBuilder<T> hide(boolean hide) {
		item.setHide(hide);
		return this;
	}
	public ItemBuilder<T> hide(){
		return hide(true);
	}
	public ItemBuilder<T> needReset(boolean needReset) {
		if(item instanceof CmdItem){
			((CmdItem)item).setNeedReset(needReset);
		}
		return this;
	}
	public ItemBuilder<T> needReset() {
		return needReset(true);
	}
	public ItemBuilder<T> description(String description) {
		item.setDescription(description);
		return this;
	}

	public ItemBuilder<T> uiName(String uiName) {
		item.setUiName(uiName);
		return this;
	}

	public ItemBuilder<T> childs(List<BaseItem> childs) {
		checkState(item.isContainer(),"%s isn't container",item.getClass().getSimpleName());
		item.setChilds(childs);
		return this;
	}

	public ItemBuilder<T> addChilds(BaseItem... childs) {
		checkState(item.isContainer(),"%s isn't container",item.getClass().getSimpleName());
		item.addChilds(childs);
		return this;
	}

	public ItemBuilder<T> addChilds(Collection<BaseItem> childs) {
		checkState(item.isContainer(),"%s isn't container",item.getClass().getSimpleName());
		item.addChilds(childs);
		return this;
	}

	public T instance(){
		return item;
	}
	public static <T extends BaseItem>ItemBuilder<T> builder(T instance) {
		return new ItemBuilder<T>(checkNotNull(instance,"instance is null"));
	}
	public static <T extends BaseItem>ItemBuilder<T> builder(Class<T> type) {
		// 不允许为抽象类
		checkArgument(!Modifier.isAbstract(type.getModifiers()),"%s is a abstract class",type.getName());
		try {
			return new ItemBuilder<T>(type.newInstance());
		} catch (Throwable e) {
			Throwables.throwIfUnchecked(e);
			throw new RuntimeException(e);
		}
	}
}