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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.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 Set _doneDependsOn;
	//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);
		_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
		if (_fieldExpr instanceof PropertyExpression) {
			_fieldExpr.setValue(null, value);
		} else
			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 != null && _doneDependsOn.contains(src)) { //this method has already done @DependsOn in this binding
				return;
			}
			_doneDependsOn = AllocUtil.inst.addSet(_doneDependsOn, src); //mark method as done @DependsOn; ZK-2289
		}
		for (String prop : props) {
			BindELContext.addDependsOnTracking(this, srcpath, basepath, prop);
		}
	}
}