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/* 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.activiti.engine.impl.scripting;

import org.activiti.engine.delegate.VariableScope;

import javax.script.Bindings;
import javax.script.SimpleScriptContext;
import java.util.*;

/**


 */
public class ScriptBindings implements Bindings {

  /**
   * The script engine implementations put some key/value pairs into the binding. 
   * This list contains those keys, such that they wouldn't be stored as process variable.
   * 
   * This list contains the keywords for JUEL, Javascript and Groovy.
   */
  protected static final Set UNSTORED_KEYS = 
    new HashSet(Arrays.asList("out", "out:print", "lang:import", "context", "elcontext", "print", "println", "nashorn.global"));

  protected List scriptResolvers;
  protected VariableScope variableScope;
  protected Bindings defaultBindings;
  protected boolean storeScriptVariables = true; // By default everything is stored (backwards compatibility)

  public ScriptBindings(List scriptResolvers, VariableScope variableScope) {
    this.scriptResolvers = scriptResolvers;
    this.variableScope = variableScope;
    this.defaultBindings = new SimpleScriptContext().getBindings(SimpleScriptContext.ENGINE_SCOPE);
  }

  public ScriptBindings(List scriptResolvers, VariableScope variableScope, boolean storeScriptVariables) {
    this(scriptResolvers, variableScope);
    this.storeScriptVariables = storeScriptVariables;
  }

  public boolean containsKey(Object key) {
    for (Resolver scriptResolver : scriptResolvers) {
      if (scriptResolver.containsKey(key)) {
        return true;
      }
    }
    return defaultBindings.containsKey(key);
  }

  public Object get(Object key) {
    for (Resolver scriptResolver : scriptResolvers) {
      if (scriptResolver.containsKey(key)) {
        return scriptResolver.get(key);
      }
    }
    return defaultBindings.get(key);
  }

  public Object put(String name, Object value) {
    if (storeScriptVariables) {
      Object oldValue = null;
      if (!UNSTORED_KEYS.contains(name)) {
        oldValue = variableScope.getVariable(name);
        variableScope.setVariable(name, value);
        return oldValue;
      }
    }
    return defaultBindings.put(name, value);
  }

  public Set> entrySet() {
    return variableScope.getVariables().entrySet();
  }

  public Set keySet() {
    return variableScope.getVariables().keySet();
  }

  public int size() {
    return variableScope.getVariables().size();
  }

  public Collection