/*
 * Copyright 2004-2010 the Seasar Foundation and the Others.
 *
 * Licensed 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.seasar.mayaa.impl.cycle.script.rhino;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.mozilla.javascript.Context;
import org.mozilla.javascript.NativeJavaObject;
import org.mozilla.javascript.ScriptRuntime;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Undefined;
import org.seasar.mayaa.cycle.ServiceCycle;
import org.seasar.mayaa.cycle.scope.AttributeScope;
import org.seasar.mayaa.impl.cycle.CycleUtil;

/**
 * @author Masataka Kurihara (Gluegent, Inc.)
 */
public class NativeServiceCycle extends NativeJavaObject {

    private static final long serialVersionUID = 326309209323166932L;

    private ServiceCycle _cycle;

    public NativeServiceCycle(Scriptable scope, ServiceCycle cycle) {
        super(scope, cycle, Map.class);
        if (cycle == null) {
            throw new IllegalArgumentException();
        }
        _cycle = cycle;
    }

    public boolean has(String name, Scriptable start) {
        ServiceCycle cycle = CycleUtil.getServiceCycle();
        if (cycle.hasAttributeScope(name)
                || CycleUtil.findStandardAttributeScope(name) != null) {
            return true;
        }
        return super.has(name, start);
    }

    /**
     * Indicates whether or not a named property is defined in an object. Does not traverse the prototype chain.
     * The property is specified by a String name as defined for the get method.
     * @param name the name of the property
     * @param start the object in which the lookup began
     * @return true if and only if the named property is found in the object
     */
    public boolean hasMember(String name, Scriptable start) {
        return super.has(name, start);
    }

    public Object get(String name, Scriptable start) {
        ServiceCycle cycle = CycleUtil.getServiceCycle();
        if (cycle.hasAttributeScope(name)) {
            return cycle.getAttributeScope(name);
        }
        AttributeScope scope = CycleUtil.findStandardAttributeScope(name);
        if (scope != null) {
            return scope.getAttribute(name);
        }
        Object result = super.get(name, start);
        if (start == this && result == Scriptable.NOT_FOUND) {
            // 先回りしてチェック
            if (Scriptable.NOT_FOUND == ScriptableObject.getProperty(getParentScope(), name)) {
            	// topLevelScopeからも先回りチェックして判断しないと、"java" や "Packages" が undefined になってしまう。
            	Context cx = Context.getCurrentContext();
            	if (ScriptRuntime.hasTopCall(cx)) {
            		ScriptableObject global = (ScriptableObject)ScriptRuntime.getTopCallScope(cx);
            		result = ScriptableObject.getProperty(global, name);
            	}
            	if (result == Scriptable.NOT_FOUND) {
            		result = Undefined.instance;
            	}
            }
        }
        return result;
    }

    protected void addAttributesTo(AttributeScope scope, Set set) {
        for (Iterator it = scope.iterateAttributeNames(); it.hasNext();) {
            Object attrName = it.next();
            if (set.contains(attrName) == false) {
                set.add(attrName);
            }
        }
    }

    public Object[] getIds() {
        Set set = new HashSet();
        for (Iterator it = _cycle.iterateAttributeScope(); it.hasNext();) {
            AttributeScope attrs = (AttributeScope) it.next();
            String scopeName = attrs.getScopeName();
            if (set.contains(scopeName) == false) {
                set.add(scopeName);
            }
        }
        addAttributesTo(_cycle.getPageScope(), set);
        addAttributesTo(_cycle.getRequestScope(), set);
        addAttributesTo(_cycle.getSessionScope(), set);
        addAttributesTo(_cycle.getApplicationScope(), set);
        Object[] ids = super.getIds();
        for (int i = 0; i < ids.length; i++) {
            Object name = ids[i];
            if (set.contains(name) == false) {
                set.add(name);
            }
        }
        return set.toArray(new Object[set.size()]);
    }

    public String getClassName() {
        return "serviceCycle";
    }

    public void put(String name, Scriptable start, Object value) {
        if (prototype == null || super.has(name, null)) {
        	ServiceCycle cycle = CycleUtil.getServiceCycle();
        	AttributeScope scope;
            if (cycle.hasAttributeScope(name)) {
            	scope = cycle.getAttributeScope(name);
            } else {
            	scope = CycleUtil.findStandardAttributeScope(name);
            }
            if (scope != null) {
            	scope.setAttribute(name, value);
            } else {
            	super.put(name, start, value);
            }
        } else {
            prototype.put(name, prototype, value);
        }
    }
}
