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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.cmd;

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

import java.util.Collection;

import org.camunda.bpm.engine.BadUserRequestException;
import org.camunda.bpm.engine.form.FormField;
import org.camunda.bpm.engine.form.TaskFormData;
import org.camunda.bpm.engine.impl.cfg.CommandChecker;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.TaskEntity;
import org.camunda.bpm.engine.impl.persistence.entity.TaskManager;
import org.camunda.bpm.engine.impl.task.TaskDefinition;
import org.camunda.bpm.engine.variable.VariableMap;
import org.camunda.bpm.engine.variable.impl.VariableMapImpl;

/**
 * @author Daniel Meyer
 *
 */
public class GetTaskFormVariablesCmd extends AbstractGetFormVariablesCmd {

  private static final long serialVersionUID = 1L;

  public GetTaskFormVariablesCmd(String taskId, Collection variableNames, boolean deserializeObjectValues) {
    super(taskId, variableNames, deserializeObjectValues);
  }

  public VariableMap execute(CommandContext commandContext) {
    final TaskManager taskManager = commandContext.getTaskManager();
    TaskEntity task = taskManager.findTaskById(resourceId);

    ensureNotNull(BadUserRequestException.class, "Cannot find task with id '" + resourceId + "'.", "task", task);

    checkGetTaskFormVariables(task, commandContext);

    VariableMapImpl result = new VariableMapImpl();

    // first, evaluate form fields
    TaskDefinition taskDefinition = task.getTaskDefinition();
    if (taskDefinition != null) {
      TaskFormData taskFormData = taskDefinition.getTaskFormHandler().createTaskForm(task);
      for (FormField formField : taskFormData.getFormFields()) {
        if(formVariableNames == null || formVariableNames.contains(formField.getId())) {
          result.put(formField.getId(), createVariable(formField, task));
        }
      }
    }

    // collect remaining variables from task scope and parent scopes
    task.collectVariables(result, formVariableNames, false, deserializeObjectValues);

    return result;
  }

  protected void checkGetTaskFormVariables(TaskEntity task, CommandContext commandContext) {
    for(CommandChecker checker : commandContext.getProcessEngineConfiguration().getCommandCheckers()) {
      checker.checkReadTaskVariable(task);
    }
  }
}