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package org.activiti.engine.impl;

import java.util.List;

import org.activiti.engine.history.HistoricActivityInstance;
import org.activiti.engine.history.HistoricData;
import org.activiti.engine.history.HistoricVariableInstance;
import org.activiti.engine.history.HistoricVariableUpdate;
import org.activiti.engine.history.ProcessInstanceHistoryLog;
import org.activiti.engine.history.ProcessInstanceHistoryLogQuery;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.interceptor.CommandExecutor;
import org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntity;
import org.activiti.engine.impl.persistence.entity.HistoricVariableInstanceEntity;
import org.activiti.engine.impl.variable.CacheableVariable;
import org.activiti.engine.impl.variable.JPAEntityListVariableType;
import org.activiti.engine.impl.variable.JPAEntityVariableType;

/**

 */
public class ProcessInstanceHistoryLogQueryImpl implements ProcessInstanceHistoryLogQuery, Command {

  protected CommandExecutor commandExecutor;

  protected String processInstanceId;
  protected boolean includeTasks;
  protected boolean includeActivities;
  protected boolean includeVariables;
  protected boolean includeComments;
  protected boolean includeVariableUpdates;
  protected boolean includeFormProperties;

  public ProcessInstanceHistoryLogQueryImpl(CommandExecutor commandExecutor, String processInstanceId) {
    this.commandExecutor = commandExecutor;
    this.processInstanceId = processInstanceId;
  }

  @Override
  public ProcessInstanceHistoryLogQuery includeTasks() {
    this.includeTasks = true;
    return this;
  }

  @Override
  public ProcessInstanceHistoryLogQuery includeComments() {
    this.includeComments = true;
    return this;
  }

  @Override
  public ProcessInstanceHistoryLogQuery includeActivities() {
    this.includeActivities = true;
    return this;
  }

  @Override
  public ProcessInstanceHistoryLogQuery includeVariables() {
    this.includeVariables = true;
    return this;
  }

  @Override
  public ProcessInstanceHistoryLogQuery includeVariableUpdates() {
    this.includeVariableUpdates = true;
    return this;
  }

  @Override
  public ProcessInstanceHistoryLogQuery includeFormProperties() {
    this.includeFormProperties = true;
    return this;
  }

  @Override
  public ProcessInstanceHistoryLog singleResult() {
    return commandExecutor.execute(this);
  }

  @Override
  public ProcessInstanceHistoryLog execute(CommandContext commandContext) {

    // Fetch historic process instance
    HistoricProcessInstanceEntity historicProcessInstance = commandContext.getHistoricProcessInstanceEntityManager().findById(processInstanceId);

    if (historicProcessInstance == null) {
      return null;
    }

    // Create a log using this historic process instance
    ProcessInstanceHistoryLogImpl processInstanceHistoryLog = new ProcessInstanceHistoryLogImpl(historicProcessInstance);

    // Add events, based on query settings

    // Tasks
    if (includeTasks) {
      List tasks = commandContext.getHistoricTaskInstanceEntityManager().findHistoricTaskInstancesByQueryCriteria(
          new HistoricTaskInstanceQueryImpl(commandExecutor).processInstanceId(processInstanceId));
      processInstanceHistoryLog.addHistoricData(tasks);
    }

    // Activities
    if (includeActivities) {
      List activities = commandContext.getHistoricActivityInstanceEntityManager().findHistoricActivityInstancesByQueryCriteria(
          new HistoricActivityInstanceQueryImpl(commandExecutor).processInstanceId(processInstanceId), null);
      processInstanceHistoryLog.addHistoricData(activities);
    }

    // Variables
    if (includeVariables) {
      List variables = commandContext.getHistoricVariableInstanceEntityManager().findHistoricVariableInstancesByQueryCriteria(
          new HistoricVariableInstanceQueryImpl(commandExecutor).processInstanceId(processInstanceId), null);
      
      // Make sure all variables values are fetched (similar to the HistoricVariableInstance query)
      for (HistoricVariableInstance historicVariableInstance : variables) {
        historicVariableInstance.getValue();
        
        // make sure JPA entities are cached for later retrieval
        HistoricVariableInstanceEntity variableEntity = (HistoricVariableInstanceEntity) historicVariableInstance;
        if (JPAEntityVariableType.TYPE_NAME.equals(variableEntity.getVariableType().getTypeName()) || JPAEntityListVariableType.TYPE_NAME.equals(variableEntity.getVariableType().getTypeName())) {
          ((CacheableVariable) variableEntity.getVariableType()).setForceCacheable(true);
        }
      }
      
      processInstanceHistoryLog.addHistoricData(variables);
    }

    // Comment
    if (includeComments) {
      List comments = commandContext.getCommentEntityManager().findCommentsByProcessInstanceId(processInstanceId);
      processInstanceHistoryLog.addHistoricData(comments);
    }

    // Details: variables
    if (includeVariableUpdates) {
      List variableUpdates = commandContext.getHistoricDetailEntityManager().findHistoricDetailsByQueryCriteria(
          new HistoricDetailQueryImpl(commandExecutor).variableUpdates(), null);
      
      // Make sure all variables values are fetched (similar to the HistoricVariableInstance query)
      for (HistoricData historicData : variableUpdates) {
        HistoricVariableUpdate variableUpdate = (HistoricVariableUpdate) historicData;
        variableUpdate.getValue();
      }
      
      processInstanceHistoryLog.addHistoricData(variableUpdates);
    }

    // Details: form properties
    if (includeFormProperties) {
      List formProperties = commandContext.getHistoricDetailEntityManager().findHistoricDetailsByQueryCriteria(
          new HistoricDetailQueryImpl(commandExecutor).formProperties(), null);
      processInstanceHistoryLog.addHistoricData(formProperties);
    }

    // All events collected. Sort them by date.
    processInstanceHistoryLog.orderHistoricData();

    return processInstanceHistoryLog;
  }

}