package foundation.dao;

import java.util.HashSet;
import java.util.Set;

import foundation.util.Util;
import foundation.variant.provider.DataEvent;
import foundation.variant.provider.IVariantsProvider;
import foundation.variant.provider.VariantProviderType;

public class OrderBy implements IVariantsProvider {

	public static final String PageOrderByField = "idx";
	public static String ProviderName = "orderBy";
	public static Set<String> VariantNames;
	private String value;
	private boolean empty;
	
	static {
    	VariantNames = new HashSet<String>();
    	VariantNames.add(ProviderName);
    	VariantNames.add(ProviderName.toLowerCase());
	}
	
	public OrderBy() {
		empty = true;
	}
	
	public OrderBy(String value) {
		this.value = value;
		empty = Util.isEmpty(value);
	}
	
	public OrderBy(String value, String asc) {
		if (asc != null) {
			value = value + asc;
		}
		
		this.value = value;
		empty = Util.isEmpty(value);
	}
	
	public void add(String value) {
		if (Util.isEmpty(this.value)) {
			this.value = value;
			empty = Util.isEmpty(this.value);
			return;
		}
		
		if (this.value.contains(value)) {
			return;
		}
		
		this.value = this.value + ", " + value;
		empty = Util.isEmpty(this.value);
	}

	public void addAll(OrderBy another) {
		if (another == null) {
			return;
		}
		
		String orderByDefault = another.getDefaultValue();
				
		if (Util.isEmpty(orderByDefault)) {
			return;
		}
		
		String[] values = orderByDefault.split(",");
		
		for (String value: values) {
			 add(value.replace(" ", "")); 
		}
	}
	
	//@he
	public String getDefaultValue() {
		if (empty) {
			return "";
		}
		
		return value;	
	}

	public String getValue() {
		if (empty) {
			return "";
		}
		
		return " order by " + value + " ";
	}

	public boolean isEmpty() {
		return empty;
	}

	@Override
	public boolean containsVariant(String name) {
		return "orderby".equalsIgnoreCase(name);
	}

	@Override
	public Object getVariantValue(DataEvent dataEvent, String name) {
		return getValue();
	}
	
	@Override
	public String getProviderName() {
		return ProviderName;
	}

	@Override
	public VariantProviderType getProviderType() {
		return VariantProviderType.Transiant;
	} 
	
	public Set<String> getVariantNames() {
		return VariantNames;
	}

	@Override 
	public String toString() {
		return getValue();
	}
	
}