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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.ode.bpel.runtime;

import java.net.URI;
import java.util.Date;
import java.util.Map;

import javax.xml.namespace.QName;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ode.bpel.common.FaultException;
import org.apache.ode.bpel.evt.ScopeEvent;
import org.apache.ode.bpel.evt.VariableReadEvent;
import org.apache.ode.bpel.explang.EvaluationContext;
import org.apache.ode.bpel.explang.EvaluationException;
import org.apache.ode.bpel.o.OConstantVarType;
import org.apache.ode.bpel.o.OExpression;
import org.apache.ode.bpel.o.OLink;
import org.apache.ode.bpel.o.OMessageVarType;
import org.apache.ode.bpel.o.OProcess;
import org.apache.ode.bpel.o.OScope;
import org.apache.ode.bpel.o.OMessageVarType.Part;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * The context in which BPEL expressions are evaluated. This class is handed of
 * the {@link org.apache.ode.bpel.o.OExpression} instances to provide access to
 * variables, link statuses, and the like.
 */
public class ExprEvaluationContextImpl implements EvaluationContext {
    private static final Log __log = LogFactory
            .getLog(ExprEvaluationContextImpl.class);

    private BpelRuntimeContext _native;

    private ScopeFrame _scopeInstance;

    private Map _linkVals;

    private Node _root;

    public ExprEvaluationContextImpl(ScopeFrame scopeInstace,
            BpelRuntimeContext ntv) {
        _native = ntv;
        _scopeInstance = scopeInstace;
    }

    public ExprEvaluationContextImpl(ScopeFrame scopeInstace,
            BpelRuntimeContext ntv, Node root) {
        this(scopeInstace, ntv);
        _root = root;
    }

    public ExprEvaluationContextImpl(ScopeFrame scopeInstnce,
            BpelRuntimeContext ntv, Map linkVals) {
        this(scopeInstnce, ntv);
        _linkVals = linkVals;
    }

    public Node readVariable(OScope.Variable variable, OMessageVarType.Part part)
            throws FaultException {
        if (__log.isTraceEnabled())
            __log.trace("readVariable(" + variable + "," + part + ")");

        // TODO: check for null _scopeInstance

        Node ret;
        if (variable.type instanceof OConstantVarType) {
            ret = ((OConstantVarType) variable.type).getValue();
        } else {
            VariableInstance varInstance = _scopeInstance.resolve(variable);
            if (varInstance == null)
                return null;
            VariableReadEvent vre = new VariableReadEvent();
            vre.setVarName(varInstance.declaration.name);
            sendEvent(vre);
            ret = _scopeInstance.fetchVariableData(_native,varInstance, part, false);
        }
        return ret;
    }

    public Node evaluateQuery(Node root, OExpression expr)
            throws FaultException, EvaluationException {
        return _native.getExpLangRuntime()
                .evaluateNode(
                        expr,
                        new ExprEvaluationContextImpl(_scopeInstance,
                                _native, root));
    }

    public String readMessageProperty(OScope.Variable variable,
            OProcess.OProperty property) throws FaultException {
        VariableInstance varInstance = _scopeInstance.resolve(variable);
        return _native.readProperty(varInstance, property);
    }

    public boolean isLinkActive(OLink olink) throws FaultException {
        return _linkVals.get(olink);
    }

    public String toString() {
        return "{ExprEvaluationContextImpl scopeInstance=" + _scopeInstance
                + ", activeLinks=" + _linkVals + "}";
    }

    public Node getRootNode() {
        return _root;
    }

    public Node getPartData(Element message, Part part) throws FaultException {
        return _scopeInstance.getPartData(message, part);
    }

    public Long getProcessId() {
        return _native.getPid();
    }

    public boolean narrowTypes() {
        return true;
    }

    private void sendEvent(ScopeEvent se) {
        _scopeInstance.fillEventInfo(se);
        _native.sendEvent(se);
    }

    public URI getBaseResourceURI() {
        return _native.getBaseResourceURI();
    }

    public Node getPropertyValue(QName propertyName) {
        return _native.getProcessProperty(propertyName);
    }

    public QName getProcessQName() {
        return _native.getProcessQName();
    }

    public Date getCurrentEventDateTime() {
        return _native.getCurrentEventDateTime();
    }
}