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package org.jbpm.command;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.JbpmContext;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.util.ArrayUtil;

/**
 * Abstract base class for all commands working on {@link org.jbpm.graph.exe.ProcessInstance}s.
 * The {@link ProcessInstance} can either be specified by id or multiple ids. The alternative is
 * to specify a {@link ProcessDefinition} name and version. In this case all found
 * {@link ProcessInstance}s are processed. If no version is specified, all versions are
 * taken into account. if onlyRunning is set to false (default is true) already ended
 * {@link ProcessInstance}s are processed too.
 * 
 * @author [email protected]
 */
public abstract class AbstractProcessInstanceBaseCommand extends AbstractBaseCommand {

  protected final Log log = LogFactory.getLog(getClass());

  private long[] processInstanceIds;
  private String processName;
  private int processVersion;
  private boolean onlyRunning = true;

  private boolean operateOnSingleObject;

  private transient JbpmContext jbpmContext;

  private static final long serialVersionUID = 1L;

  protected JbpmContext getJbpmContext() {
    return jbpmContext;
  }

  public Object execute(JbpmContext jbpmContext) throws Exception {
    ArrayList result = new ArrayList();
    this.jbpmContext = jbpmContext;
    try {
      // batch tokens
      if (processInstanceIds != null && processInstanceIds.length > 0) {
        for (int i = 0; i < processInstanceIds.length; i++) {
          ProcessInstance pi = jbpmContext.loadProcessInstanceForUpdate(processInstanceIds[i]);
          result.add(execute(pi));
        }
      }

      // search for ProcessInstances according to parameters
      if (processName != null) {
        operateOnSingleObject = false;

        GetProcessInstancesCommand cmd = new GetProcessInstancesCommand();
        cmd.setProcessDefinitionName(processName);
        cmd.setOnlyRunning(onlyRunning);
        if (processVersion > 0) cmd.setVersion(String.valueOf(processVersion));

        List processInstanceList = (List) cmd.execute(jbpmContext);
        for (Iterator iter = processInstanceList.iterator(); iter.hasNext();) {
          ProcessInstance pi = (ProcessInstance) iter.next();
          execute(pi);
        }
      }

      if (operateOnSingleObject) {
        return result.isEmpty() ? null : result.get(0);
      }
      else {
        return result;
      }
    }
    finally {
      jbpmContext = null;
    }
  }

  public abstract ProcessInstance execute(ProcessInstance processInstance);

  public void setProcessInstanceIds(long[] processInstanceIds) {
    operateOnSingleObject = false;
    this.processInstanceIds = processInstanceIds;
  }

  public void setProcessInstanceId(long processInstanceId) {
    operateOnSingleObject = true;
    processInstanceIds = new long[1];
    processInstanceIds[0] = processInstanceId;
  }

  /**
   * Overwrite toString to keep semantic of getAdditionalToStringInformation
   */
  public String toString() {
    if (processName != null) {
      return getClass().getName() + " [tokenIds=" + ArrayUtil.toString(processInstanceIds)
        + ";processName=" + processName + ";processVersion="
        + (processVersion > 0 ? Integer.toString(processVersion) : "NA")
        + getAdditionalToStringInformation() + "]";
    }
    else {
      return getClass().getName() + " [tokenIds=" + ArrayUtil.toString(processInstanceIds)
        + ";operateOnSingleObject=" + operateOnSingleObject
        + getAdditionalToStringInformation() + "]";
    }
  }

  public String getProcessName() {
    return processName;
  }

  public void setProcessName(String processName) {
    this.processName = processName;
  }

  public int getProcessVersion() {
    return processVersion;
  }

  public void setProcessVersion(int processVersion) {
    this.processVersion = processVersion;
  }

  public long[] getProcessInstanceIds() {
    return processInstanceIds;
  }

  /**
   * return the process instance id in case only one process instance id is set. Otherwise an
   * {@link IllegalStateException} is thrown
   */
  public long getProcessInstanceId() {
    if (processInstanceIds == null || processInstanceIds.length > 1) {
      throw new IllegalStateException("multiple process instance ids set: "
        + ArrayUtil.toString(processInstanceIds));
    }
    return processInstanceIds[0];
  }

  public boolean isOnlyRunning() {
    return onlyRunning;
  }

  public void setOnlyRunning(boolean onlyRunning) {
    this.onlyRunning = onlyRunning;
  }

  // methods for fluent programming

  public AbstractProcessInstanceBaseCommand processInstanceIds(long[] processInstanceIds) {
    setProcessInstanceIds(processInstanceIds);
    return this;
  }

  public AbstractProcessInstanceBaseCommand processInstanceId(long processInstanceId) {
    setProcessInstanceId(processInstanceId);
    return this;
  }

  public AbstractProcessInstanceBaseCommand processName(String processName) {
    setProcessName(processName);
    return this;
  }

  public AbstractProcessInstanceBaseCommand processVersion(int processVersion) {
    setProcessVersion(processVersion);
    return this;
  }

  public AbstractProcessInstanceBaseCommand onlyRunning(boolean onlyRunning) {
    setOnlyRunning(onlyRunning);
    return this;
  }
}