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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.common.jsonexplain.tez;

import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.common.jsonexplain.JsonParser;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.json.JSONException;
import org.json.JSONObject;

public class TezJsonParser implements JsonParser {
  JSONObject inputObject;
  Map stages;
  PrintStream outputStream;
  protected final Log LOG;
  // the object that has been printed.
  public static Set printSet = new HashSet<>();
  // the vertex that should be inlined. 
  public static Map> inlineMap = new HashMap<>();
  public TezJsonParser() {
    super();
    LOG = LogFactory.getLog(this.getClass().getName());
  }
  public void extractStagesAndPlans() throws JSONException, JsonParseException,
      JsonMappingException, Exception, IOException {
    // extract stages
    this.stages = new HashMap();
    JSONObject dependency = inputObject.getJSONObject("STAGE DEPENDENCIES");
    if (dependency.length() > 0) {
      // iterate for the first time to get all the names of stages.
      for (String stageName : JSONObject.getNames(dependency)) {
        this.stages.put(stageName, new Stage(stageName));
      }
      // iterate for the second time to get all the dependency.
      for (String stageName : JSONObject.getNames(dependency)) {
        JSONObject dependentStageNames = dependency.getJSONObject(stageName);
        this.stages.get(stageName).addDependency(dependentStageNames, this.stages);
      }
    }
    // extract stage plans
    JSONObject stagePlans = inputObject.getJSONObject("STAGE PLANS");
    if (stagePlans.length() > 0) {
      for (String stageName : JSONObject.getNames(stagePlans)) {
        JSONObject stagePlan = stagePlans.getJSONObject(stageName);
        this.stages.get(stageName).extractVertex(stagePlan);
      }
    }
  }

  /**
   * @param indentFlag
   * help to generate correct indent
   * @return 
   */
  public static String prefixString(List indentFlag) {
    StringBuilder sb = new StringBuilder();
    for (int index = 0; index < indentFlag.size(); index++) {
      if (indentFlag.get(index))
        sb.append("|  ");
      else
        sb.append("   ");
    }
    return sb.toString();
  }

  /**
   * @param indentFlag
   * @param tail
   * help to generate correct indent with a specific tail
   * @return
   */
  public static String prefixString(List indentFlag, String tail) {
    StringBuilder sb = new StringBuilder();
    for (int index = 0; index < indentFlag.size(); index++) {
      if (indentFlag.get(index))
        sb.append("|  ");
      else
        sb.append("   ");
    }
    int len = sb.length();
    return sb.replace(len - tail.length(), len, tail).toString();
  }

  @Override
  public void print(JSONObject inputObject, PrintStream outputStream) throws Exception {
    LOG.info("JsonParser is parsing\n" + inputObject.toString());
    this.inputObject = inputObject;
    this.outputStream = outputStream;
    this.extractStagesAndPlans();
    // print out the cbo info
    if (inputObject.has("cboInfo")) {
      outputStream.println(inputObject.getString("cboInfo"));
      outputStream.println();
    }
    // print out the vertex dependency in root stage
    for (Stage candidate : this.stages.values()) {
      if (candidate.tezStageDependency != null && candidate.tezStageDependency.size() > 0) {
        outputStream.println("Vertex dependency in root stage");
        for (Entry> entry : candidate.tezStageDependency.entrySet()) {
          StringBuffer sb = new StringBuffer();
          sb.append(entry.getKey().name);
          sb.append(" <- ");
          boolean printcomma = false;
          for (Connection connection : entry.getValue()) {
            if (printcomma) {
              sb.append(", ");
            } else {
              printcomma = true;
            }
            sb.append(connection.from.name + " (" + connection.type + ")");
          }
          outputStream.println(sb.toString());
        }
        outputStream.println();
      }
    }
    List indentFlag = new ArrayList<>();
    // print out all the stages that have no childStages.
    for (Stage candidate : this.stages.values()) {
      if (candidate.childStages.isEmpty()) {
        candidate.print(outputStream, indentFlag);
      }
    }
  }

  public static void addInline(Op op, Connection connection) {
    List list = inlineMap.get(op);
    if (list == null) {
      list = new ArrayList<>();
      list.add(connection);
      inlineMap.put(op, list);
    } else {
      list.add(connection);
    }
  }
  public static boolean isInline(Vertex v) {
    for(List list : inlineMap.values()){
      for (Connection connection : list) {
        if(connection.from.equals(v)){
          return true;
        }
      }
    }
    return false;
  }
}
 















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