package foundation.code;

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

import foundation.dao.bizlogic.ICodeProvider;
import foundation.data.entity.Entity;
import foundation.data.object.IParamProvider;
import foundation.data.rule.FieldDefaultValueCreator;
import foundation.data.rule.FieldDefaultValueType;
import foundation.variant.provider.DataEvent;
import foundation.variant.provider.IVariantsProvider;
import foundation.variant.provider.VariantProviderType;

public class CodeDefaultValueCreator extends FieldDefaultValueCreator implements IVariantsProvider {

	public static String ProviderName = "code";
	private DataEvent triggerEvent;
	
	public CodeDefaultValueCreator() {
		type = FieldDefaultValueType.Code;
	}
	
	@Override
	public Object exec(DataEvent dataEvent, Entity entity, IParamProvider paramProvider) {
		
		if (DataEvent.New == dataEvent) {
			String dynamic = (paramProvider != null) ? paramProvider.getString(CodeRule.Param_DynamicSegment) : null;
			String result = CodeEngine.tempval(rule, dynamic, entity);
			entity.set(fieldName, result);
			return result;
		}
		else if (triggerEvent == null && DataEvent.Insert == dataEvent) {
			String dynamic = (paramProvider != null) ? paramProvider.getString(CodeRule.Param_DynamicSegment) : null;
			String result = CodeEngine.nextval(rule, dynamic, entity);
			entity.set(fieldName, result);
			return result;
		}
		else if (triggerEvent != null && DataEvent.Insert == dataEvent ) {
			String dynamic = (paramProvider != null) ? paramProvider.getString(CodeRule.Param_DynamicSegment) : null;
			String result = CodeEngine.tempval(rule, dynamic, entity);
			entity.set(fieldName, result);
			return result;
		}
		else if (triggerEvent != null && triggerEvent == dataEvent) {
			String dynamic = (paramProvider != null) ? paramProvider.getString(CodeRule.Param_DynamicSegment) : null;
			String result = CodeEngine.nextval(rule, dynamic, entity);
			entity.set(fieldName, result);
			return result;
		}
		else if (DataEvent.Update == dataEvent) {
			entity.set(fieldName, null);
			return "不修改原值";
		}
		
		return null;
	}

	@Override
	public Object getVariantValue(DataEvent dataEvent, String name) {
		String result = null;
		
		if (DataEvent.New == dataEvent) {
			result = CodeEngine.tempval(name, null);
		}
		else if (DataEvent.Insert == dataEvent) {
			result = CodeEngine.nextval(name, null);
		}
		
		return result;
	}
	
	@Override
	public ICodeProvider getCodeProvider() {
		return null;
	}

	@Override
	public String getProviderName() {
		return ProviderName;
	}

	@Override
	public VariantProviderType getProviderType() {
		return VariantProviderType.Persist;
	}

	@Override
	public boolean containsVariant(String name) {
		return CodeEngine.contains(name);
	}
	
	public Set<String> getVariantNames() {
		Set<String> result = new HashSet<String>();
		
		List<CodeRuleRuntime> ruleList = CodeEngine.getCodeRuleList();
		
		for (CodeRuleRuntime ruleRuntime: ruleList) {
			result.add(ruleRuntime.getCode());
		}
		
		return result;
	}
	
	@Override
	public void setRule(String rule) {
		this.rule = rule;
		int pos = rule.indexOf(".");

		if (pos > 0) {
			this.triggerEvent = DataEvent.parse(rule.substring(0, pos));
			this.rule = rule.substring(pos + 1);
		}
	}

}