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package com.avaje.ebean.meta;

import java.io.Serializable;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Transient;

import com.avaje.ebean.bean.ObjectGraphOrigin;

/**
 * Statistics collected by AutoFetch profiling.
 */
@Entity
public class MetaAutoFetchStatistic implements Serializable {

  private static final long serialVersionUID = -6640406753257176803L;

  @Id
  private String id;

  private ObjectGraphOrigin origin;

  private String beanType;

  private int counter;

  @Transient
  private List queryStats;

  @Transient
  private List nodeUsageStats;

  public MetaAutoFetchStatistic() {
  }

  public MetaAutoFetchStatistic(ObjectGraphOrigin origin, int counter, List queryStats,
      List nodeUsageStats) {

    this.origin = origin;
    this.beanType = origin == null ? null : origin.getBeanType();
    this.id = origin == null ? null : origin.getKey();
    this.counter = counter;
    this.queryStats = queryStats;
    this.nodeUsageStats = nodeUsageStats;
  }

  /**
   * This is the query point key.
   */
  public String getId() {
    return id;
  }

  /**
   * Return the bean type.
   */
  public String getBeanType() {
    return beanType;
  }

  /**
   * Return the query point.
   */
  public ObjectGraphOrigin getOrigin() {
    return origin;
  }

  /**
   * Return the number of profiled queries the statistics is based on.
   */
  public int getCounter() {
    return counter;
  }

  /**
   * Return the query execution statistics.
   */
  public List getQueryStats() {
    return queryStats;
  }

  /**
   * Return the node usage statistics.
   */
  public List getNodeUsageStats() {
    return nodeUsageStats;
  }

  /**
   * FIXME: This will likely be deprecated in favour of a separate object graph
   * cost.
   */
  public static class QueryStats implements Serializable {

    private static final long serialVersionUID = -5517935732867671387L;

    private final String path;

    private final int exeCount;

    private final int totalBeanLoaded;

    private final int totalMicros;

    public QueryStats(String path, int exeCount, int totalBeanLoaded, int totalMicros) {
      this.path = path;
      this.exeCount = exeCount;
      this.totalBeanLoaded = totalBeanLoaded;
      this.totalMicros = totalMicros;
    }

    /**
     * Return the path. This is empty string for the origin query and otherwise
     * the path for the associated lazy loading queries.
     */
    public String getPath() {
      return path;
    }

    /**
     * The number of queries executed.
     */
    public int getExeCount() {
      return exeCount;
    }

    /**
     * The total number of beans loaded by the query.
     */
    public int getTotalBeanLoaded() {
      return totalBeanLoaded;
    }

    /**
     * The total time in microseconds of the queries.
     */
    public int getTotalMicros() {
      return totalMicros;
    }

    public String toString() {
      long avgMicros = exeCount == 0 ? 0 : totalMicros / exeCount;

      return "queryExe path[" + path + "] count[" + exeCount + "] totalBeansLoaded["
          + totalBeanLoaded + "] avgMicros[" + avgMicros + "] totalMicros[" + totalMicros
          + "]";
    }
  }

  /**
   * Collects usages statistics for a given node in the object graph.
   */
  public static class NodeUsageStats implements Serializable {

    private static final long serialVersionUID = 1786787832374844739L;

    private final String path;

    private final int profileCount;

    private final int profileUsedCount;

    private final String[] usedProperties;

    public NodeUsageStats(String path, int profileCount, int profileUsedCount,
        String[] usedProperties) {
      this.path = path == null ? "" : path;
      this.profileCount = profileCount;
      this.profileUsedCount = profileUsedCount;
      this.usedProperties = usedProperties;
    }

    /**
     * Return the path. This is empty string for the origin and otherwise the
     * path for the associated nodes.
     */
    public String getPath() {
      return path;
    }

    /**
     * The number of profiled beans for this node.
     */
    public int getProfileCount() {
      return profileCount;
    }

    /**
     * The number of profiled beans that where actually used for this node.
     * 
     * The difference between profiled and used could show uneven traversal of
     * the object graph. UI paging through results means the traversal for the
     * first x beans can be much higher than the last x beans.
     * 
     */
    public int getProfileUsedCount() {
      return profileUsedCount;
    }

    /**
     * The properties used at this node.
     */
    public String[] getUsedProperties() {
      return usedProperties;
    }

    /**
     * Return the properties as a Set rather than an Array.
     */
    public Set getUsedPropertiesSet() {
      LinkedHashSet s = new LinkedHashSet();
      for (int i = 0; i < usedProperties.length; i++) {
        s.add(usedProperties[i]);
      }
      return s;
    }

    public String toString() {
      return "path[" + path + "] profileCount[" + profileCount + "] used[" + profileUsedCount
          + "] props" + Arrays.toString(usedProperties);
    }
  }
}