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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.hadoop.hive.ql.wm;

import java.util.Objects;

import org.antlr.runtime.tree.Tree;
import org.apache.hadoop.hive.ql.parse.ASTNode;
import org.apache.hadoop.hive.ql.parse.HiveParser;
import org.apache.hadoop.hive.ql.parse.ParseDriver;
import org.apache.hadoop.hive.ql.parse.ParseException;

/**
 * Action that gets invoked for trigger violations.
 */
public class Action {

  public enum Type {
    KILL_QUERY("KILL"),
    MOVE_TO_POOL("MOVE TO");

    String displayName;

    Type(final String displayName) {
      this.displayName = displayName;
    }

    public String getDisplayName() {
      return displayName;
    }

    @Override
    public String toString() {
      return displayName;
    }
  }

  private final Type type;
  private final String poolName;

  public static Action fromMetastoreExpression(String metastoreActionExpression) {
    ParseDriver driver = new ParseDriver();
    ASTNode node = null;
    try {
      node = driver.parseTriggerActionExpression(metastoreActionExpression);
    } catch (ParseException e) {
      throw new IllegalArgumentException(
          "Invalid action expression: " + metastoreActionExpression, e);
    }
    if (node == null || node.getChildCount() != 2 ||
        node.getChild(1).getType() != HiveParser.EOF) {
      throw new IllegalArgumentException(
          "Invalid action expression: " + metastoreActionExpression);
    }
    node = (ASTNode) node.getChild(0);
    switch (node.getType()) {
    case HiveParser.KW_KILL:
      if (node.getChildCount() != 0) {
        throw new IllegalArgumentException("Invalid KILL action");
      }
      return new Action(Type.KILL_QUERY);
    case HiveParser.KW_MOVE: {
      if (node.getChildCount() != 1) {
        throw new IllegalArgumentException("Invalid move to action, expected poolPath");
      }
      Tree poolNode = node.getChild(0);
      StringBuilder poolPath = new StringBuilder(poolNode.getText());
      for (int i = 0; i < poolNode.getChildCount(); ++i) {
        poolPath.append(poolNode.getChild(i).getText());
      }
      return new Action(Type.MOVE_TO_POOL, poolPath.toString());
    }
    default:
      throw new IllegalArgumentException("Unhandled action expression, type: " + node.getType() +
          ": " + metastoreActionExpression);
    }
  }

  public Action(Type type) {
    this(type, null);
  }

  public Action(Type type, String poolName) {
    this.type = type;
    if (type == Type.MOVE_TO_POOL && (poolName == null || poolName.trim().isEmpty())) {
      throw new IllegalArgumentException("Pool name cannot be null or empty for action type " + type);
    }
    this.poolName = poolName;
  }

  public Type getType() {
    return type;
  }

  public String getPoolName() {
    return poolName;
  }

  @Override
  public boolean equals(final Object other) {
    if (other == null || !(other instanceof Action)) {
      return false;
    }

    if (other == this) {
      return true;
    }

    Action otherAction = (Action) other;
    return type == otherAction.type && Objects.equals(poolName, otherAction.poolName);
  }

  @Override
  public int hashCode() {
    int hash = poolName == null ? 31 : 31 * poolName.hashCode();
    hash += type == null ? 31 * hash : 31 * hash * type.hashCode();
    return hash;
  }

  @Override
  public String toString() {
    return type.getDisplayName() + (poolName == null ? "" : " " + poolName);
  }
}