package foundation.variant.provider;

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

import foundation.util.Util;

public class VariantLink { 

	public static void fillOnConsumer(DataEvent dataEvent, IVariantsConsumer consumer, IVariantsProvider... providers) throws Exception {
		if (providers == null) {
			return;
		}
		
		Set<String> nameList = consumer.getVariantNames();
		
		for (String name: nameList) {
			//如果已经有值就不重新添加了
			if (!consumer.isVariantNull(name)) {
				continue;
			}
			
			for (IVariantsProvider provider: providers) {
				if (provider == null) {
					continue;
				}
				
				if (provider.containsVariant(name)) {
					Object value = provider.getVariantValue(dataEvent, name);
					setCustomerValue(dataEvent, consumer, name, value);
				}
			}
		}
	}
	
	public static void overWriteOnConsumer(DataEvent dataEvent, IVariantsConsumer consumer, IVariantsProvider... providers) throws Exception {
		if (providers == null) {
			return;
		}
		
		Set<String> nameList = consumer.getVariantNames();
		
		for (String name: nameList) {
			for (IVariantsProvider provider: providers) {
				if (provider == null) {
					continue;
				}
				
				if (provider.containsVariant(name)) {
					Object value = provider.getVariantValue(dataEvent, name);
					setCustomerValue(dataEvent, consumer, name, value);
				}

			}
		}
	}
	
	public static boolean moveOnConsumer(DataEvent dataEvent, IVariantsProvider provider, IVariantsConsumer consumer, Set<String> excludeNames) throws Exception {
		boolean excluded = false;
		
		Set<String> nameList = consumer.getVariantNames();
		
		if (nameList == null) {
			return excluded;
		}
		
		//1. to lower 
		Set<String> lowerSet = new HashSet<String>();
		for (String one: excludeNames) {
			lowerSet.add(one.toLowerCase());
		}

		//2. compare
		for (String name: nameList) {
			if (lowerSet.contains(name)) {
				excluded = true;
				continue;
			}
			
			if (provider.containsVariant(name)) {
				Object value = provider.getVariantValue(dataEvent, name);
				setCustomerValue(dataEvent, consumer, name, value);
			}
		}		
		
		return excluded;
	}
	

	public static void moveOnProvider(DataEvent dataEvent, IVariantsProvider provider, IVariantsConsumer consumer) throws Exception {
		Set<String> nameList = provider.getVariantNames();
		
		for (String name: nameList) {
			if (consumer.containsVariant(name)) {
				Object value = provider.getVariantValue(dataEvent, name);
				setCustomerValue(dataEvent, consumer, name, value);
			}
		}
	}
	
	public static boolean moveOnProvider(DataEvent dataEvent, IVariantsProvider provider, IVariantsConsumer consumer, Set<String> excludeNames) throws Exception {
		boolean excluded = false;
		
		Set<String> lowerSet = new HashSet<String>();
		for (String one: excludeNames) {
			lowerSet.add(one.toLowerCase());
		}
		
		Set<String> nameList = provider.getVariantNames();
		
		for (String name: nameList) {
			if (lowerSet.contains(name)) {
				excluded = true;
				continue;
			}
			
			if (consumer.containsVariant(name)) {
				Object value = provider.getVariantValue(dataEvent, name);
				setCustomerValue(dataEvent, consumer, name, value);
			}
		}		
		
		return excluded;
	}

	private static void setCustomerValue(DataEvent dataEvent, IVariantsConsumer consumer, String name, Object value) throws Exception {
		if (Util.isEmpty(value)) {
			return;
		}
		
		consumer.setVariant(dataEvent, name, value);		
	}

}