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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.camunda.bpm.engine.impl.scripting;

import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureInstanceOf;
import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNotNull;

import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.ScriptEvaluationException;
import org.camunda.bpm.engine.delegate.DelegateExecution;
import org.camunda.bpm.engine.delegate.VariableScope;
import org.camunda.bpm.engine.impl.Condition;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.delegate.ScriptInvocation;

/**
 * A {@link Condition} which invokes a {@link ExecutableScript} when evaluated.
 *
 * @author Sebastian Menski
 */
public class ScriptCondition implements Condition {

  protected final ExecutableScript script;

  public ScriptCondition(ExecutableScript script) {
    this.script = script;
  }

  @Override
  public boolean evaluate(DelegateExecution execution) {
    return evaluate(execution, execution);
  }


  @Override
  public boolean evaluate(VariableScope scope, DelegateExecution execution) {
    ScriptInvocation invocation = new ScriptInvocation(script, scope, execution);
    try {
      Context
        .getProcessEngineConfiguration()
        .getDelegateInterceptor()
        .handleInvocation(invocation);
    } catch (RuntimeException e) {
      throw e;
    } catch (Exception e) {
      throw new ProcessEngineException(e);
    }

    Object result = invocation.getInvocationResult();

    ensureNotNull("condition script returns null", "result", result);
    ensureInstanceOf("condition script returns non-Boolean", "result", result, Boolean.class);

    return (Boolean) result;
  }

  @Override
  public boolean tryEvaluate(VariableScope scope, DelegateExecution execution) {
    boolean result = false;

    try {
      result = evaluate(scope, execution);
    } catch (ProcessEngineException pee) {
      if (! (pee.getMessage().contains("No such property") ||
             pee.getCause() instanceof ScriptEvaluationException) ) {
        throw pee;
      }
    }

    return result;
  }

  public ExecutableScript getScript() {
    return script;
  }

}