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/* LoadPropertyBindingImpl.java

	Purpose:
		
	Description:
		
	History:
		Aug 1, 2011 2:43:33 PM, Created by henrichen

Copyright (C) 2011 Potix Corporation. All Rights Reserved.
*/

package org.zkoss.bind.impl;

import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.zkoss.bind.BindContext;
import org.zkoss.bind.Binder;
import org.zkoss.bind.Converter;
import org.zkoss.bind.sys.BindEvaluatorX;
import org.zkoss.bind.sys.BinderCtrl;
import org.zkoss.bind.sys.ConditionType;
import org.zkoss.bind.sys.LoadPropertyBinding;
import org.zkoss.bind.sys.debugger.BindingExecutionInfoCollector;
import org.zkoss.bind.sys.debugger.impl.info.LoadInfo;
import org.zkoss.bind.xel.zel.BindELContext;
import org.zkoss.lang.Classes;
import org.zkoss.zk.ui.Component;

/**
 * Implementation of {@link LoadPropertyBinding}.
 * @author henrichen
 * @since 6.0.0
 */
public class LoadPropertyBindingImpl extends PropertyBindingImpl implements
		LoadPropertyBinding {
	private static final long serialVersionUID = 1463169907348730644L;
	private final Set _doneDependsOn;
//	private final Set> _doneConverterDependsOn;
	//ZK-682 Inputfields with constraints and ZK Bind throw wrong value exception
	private final Class _attrType;
	
	public LoadPropertyBindingImpl(Binder binder, Component comp,
		String attr, String loadAttr,Class attrType, String loadExpr, ConditionType conditionType,String command,  Map bindingArgs, 
		String converterExpr,Map converterArgs) {
		super(binder, comp, attr, "self."+loadAttr, loadExpr, conditionType, command, bindingArgs, converterExpr, converterArgs);
		_doneDependsOn = new HashSet(4);
//		_doneConverterDependsOn = new HashSet>(4);
		_attrType = attrType == null ? Object.class : attrType;
	}
	
	public void load(BindContext ctx) {
		final Component comp = getComponent();//ctx.getComponent();
		final BindEvaluatorX eval = getBinder().getEvaluatorX();
		final BindingExecutionInfoCollector collector = ((BinderCtrl)getBinder()).getBindingExecutionInfoCollector();
		
		//get data from property
		Object value = eval.getValue(ctx, comp, _accessInfo.getProperty());
		
		final boolean activating = ((BinderCtrl)getBinder()).isActivating();
		
		//use _converter to convert type if any
		@SuppressWarnings("unchecked")
		final Converter conv = getConverter();
		if (conv != null) {
//				//if a converter depends on some property, we should also add tracker
//				//TODO, Dennis, ISSUES, currently, a base path of a converter, is its binding path.
//				//ex @bind(vm.person.firstName) , it's base path is 'vm.person.firstName', not 'vm.person'
//				//this sepc is different with DependsOn of a property
//			addConverterDependsOnTrackings(conv, ctx);
			
			if(activating) return;//don't load to component if activating
			Object old;
			value = conv.coerceToUi(old = value, comp, ctx);
			if(value == Converter.IGNORED_VALUE) {
				if(collector!=null){
					collector.addInfo(new LoadInfo(LoadInfo.PROP_LOAD,comp,getConditionString(ctx),
							getPropertyString(),getFieldName(),old,getArgs(),"*Converter.IGNORED_VALUE"));
				}
				return;
			}
		}
		if(activating) return;//don't load to component if activating
		
		value = Classes.coerce(_attrType, value);
		//set data into component attribute
		eval.setValue(null, comp, _fieldExpr, value);

		if(collector!=null){
			collector.addInfo(new LoadInfo(LoadInfo.PROP_LOAD,comp,getConditionString(ctx),
					getPropertyString(),getFieldName(),value,getArgs(),null));
		}
	}
	
	private String getConditionString(BindContext ctx){
		StringBuilder condition = new StringBuilder();
		if(getConditionType()==ConditionType.BEFORE_COMMAND){
			condition.append("before = '").append(getCommandName()).append("'");
		}else if(getConditionType()==ConditionType.AFTER_COMMAND){
			condition.append("after = '").append(getCommandName()).append("'");
		}else{
			condition.append(ctx.getTriggerEvent()==null?"":"event = "+ctx.getTriggerEvent().getName()); 
		}
		return condition.length()==0?null:condition.toString();
	}
	
//	private void addConverterDependsOnTrackings(Converter conv, BindContext ctx) {
//		final Class convClz = conv.getClass();
//		if (_doneConverterDependsOn.contains(convClz)) { //avoid to eval converter @DependsOn again if not exists
//			return;
//		}
//		_doneConverterDependsOn.add(convClz);
//		final Method m = getConverterMethod(convClz);
//		final String srcpath = getPropertyString();
//		BindELContext.addDependsOnTrackings(m, srcpath, null, this, ctx);
//	}
	
	private Method getConverterMethod(Class cls) {
		try {
			return cls.getMethod("coerceToUi", new Class[] {Object.class, Component.class, BindContext.class});
		} catch (NoSuchMethodException e) {
			//ignore
		}
		return null; //shall never come here
	}
	
	/**
	 * Internal Use Only.
	 */
	public void addDependsOnTrackings(List srcpath, String basepath, String[] props) {
		if (srcpath != null) {
			final String src = BindELContext.pathToString(srcpath);
			if (_doneDependsOn.contains(src)) { //this method has already done @DependsOn in this binding
				return;
			}
			_doneDependsOn.add(src); //mark method as done @DependsOn
		}
		for(String prop : props) {
			BindELContext.addDependsOnTracking(this, srcpath, basepath, prop);
		}
	}
}