/**
* 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.mapreduce.v2.app.webapp;

import static org.apache.hadoop.yarn.webapp.view.JQueryUI.ACCORDION;
import static org.apache.hadoop.yarn.webapp.view.JQueryUI.DATATABLES;
import static org.apache.hadoop.yarn.webapp.view.JQueryUI.DATATABLES_ID;
import static org.apache.hadoop.yarn.webapp.view.JQueryUI.initID;
import static org.apache.hadoop.yarn.webapp.view.JQueryUI.tableInit;

import java.util.EnumSet;
import java.util.Collection;

import org.apache.commons.lang.StringEscapeUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.MRConfig;
import org.apache.hadoop.mapreduce.v2.api.records.JobId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptState;
import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
import org.apache.hadoop.mapreduce.v2.app.job.TaskAttempt;
import org.apache.hadoop.mapreduce.v2.app.webapp.dao.TaskAttemptInfo;
import org.apache.hadoop.mapreduce.v2.util.MRWebAppUtil;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.yarn.webapp.SubView;
import org.apache.hadoop.yarn.webapp.hamlet.Hamlet;
import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TABLE;
import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TBODY;
import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.THEAD;
import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TR;
import org.apache.hadoop.yarn.webapp.view.HtmlBlock;

import com.google.inject.Inject;

public class TaskPage extends AppView {

  static class AttemptsBlock extends HtmlBlock {
    final App app;
    final boolean enableUIActions;

    @Inject
    AttemptsBlock(App ctx, Configuration conf) {
      app = ctx;
      this.enableUIActions =
          conf.getBoolean(MRConfig.MASTER_WEBAPP_UI_ACTIONS_ENABLED,
              MRConfig.DEFAULT_MASTER_WEBAPP_UI_ACTIONS_ENABLED);
    }

    @Override
    protected void render(Block html) {
      if (!isValidRequest()) {
        html.
          h2($(TITLE));
        return;
      }

      JobId jobId = app.getJob().getID();
      if (enableUIActions) {
        // Kill task attempt

        StringBuilder script = new StringBuilder();
        script
            .append("function confirmAction(appID, jobID, taskID, attID) {\n")
            .append("  var b = confirm(\"Are you sure?\");\n")
            .append("  if (b == true) {\n")
            .append("    var current = '/proxy/' + appID")
            .append("      + '/mapreduce/task/' + taskID;\n")
            .append("    var stateURL = '/proxy/' + appID")
            .append("      + '/ws/v1/mapreduce/jobs/' + jobID")
            .append("      + '/tasks/' + taskID")
            .append("      + '/attempts/' + attID + '/state';\n")
            .append("    $.ajax({\n")
            .append("      type: 'PUT',\n")
            .append("      url: stateURL,\n")
            .append("      contentType: 'application/json',\n")
            .append("      data: '{\"state\":\"KILLED\"}',\n")
            .append("      dataType: 'json'\n")
            .append("    }).done(function(data) {\n")
            .append("         setTimeout(function() {\n")
            .append("           location.href = current;\n")
            .append("         }, 1000);\n")
            .append("    }).fail(function(data) {\n")
            .append("         console.log(data);\n")
            .append("    });\n")
            .append("  }\n")
            .append("}\n");

        html.script().$type("text/javascript")._(script.toString())._();
      }

      TR<THEAD<TABLE<Hamlet>>> tr = html.table("#attempts").thead().tr();
      tr.th(".id", "Attempt").
      th(".progress", "Progress").
      th(".state", "State").
      th(".status", "Status").
      th(".node", "Node").
      th(".logs", "Logs").
      th(".tsh", "Started").
      th(".tsh", "Finished").
      th(".tsh", "Elapsed").
      th(".note", "Note");
      if (enableUIActions) {
        tr.th(".actions", "Actions");
      }

      TBODY<TABLE<Hamlet>> tbody = tr._()._().tbody();
      // Write all the data into a JavaScript array of arrays for JQuery
      // DataTables to display
      StringBuilder attemptsTableData = new StringBuilder("[\n");

      for (TaskAttempt attempt : getTaskAttempts()) {
        TaskAttemptInfo ta = new TaskAttemptInfo(attempt, true);
        String progress = StringUtils.format("%.2f", ta.getProgress());

        String nodeHttpAddr = ta.getNode();
        String diag = ta.getNote() == null ? "" : ta.getNote();
        TaskId taskId = attempt.getID().getTaskId();
        attemptsTableData.append("[\"")
        .append(getAttemptId(taskId, ta)).append("\",\"")
        .append(progress).append("\",\"")
        .append(ta.getState().toString()).append("\",\"")
        .append(StringEscapeUtils.escapeJavaScript(
              StringEscapeUtils.escapeHtml(ta.getStatus()))).append("\",\"")

        .append(nodeHttpAddr == null ? "N/A" :
            "<a class='nodelink' href='" + MRWebAppUtil.getYARNWebappScheme() + nodeHttpAddr + "'>"
                + nodeHttpAddr + "</a>")
        .append("\",\"")

        .append(ta.getAssignedContainerId() == null ? "N/A" :
          "<a class='logslink' href='" + url(MRWebAppUtil.getYARNWebappScheme(), nodeHttpAddr, "node"
            , "containerlogs", ta.getAssignedContainerIdStr(), app.getJob()
            .getUserName()) + "'>logs</a>")
          .append("\",\"")

        .append(ta.getStartTime()).append("\",\"")
        .append(ta.getFinishTime()).append("\",\"")
        .append(ta.getElapsedTime()).append("\",\"")
        .append(StringEscapeUtils.escapeJavaScript(StringEscapeUtils.escapeHtml(
          diag)));
        if (enableUIActions) {
          attemptsTableData.append("\",\"");
          if (EnumSet.of(
                  TaskAttemptState.SUCCEEDED,
                  TaskAttemptState.FAILED,
                  TaskAttemptState.KILLED).contains(attempt.getState())) {
            attemptsTableData.append("N/A");
          } else {
            attemptsTableData
              .append("<a href=javascript:void(0) onclick=confirmAction('")
              .append(jobId.getAppId()).append("','")
              .append(jobId).append("','")
              .append(attempt.getID().getTaskId()).append("','")
              .append(ta.getId())
              .append("');>Kill</a>");
          }
          attemptsTableData.append("\"],\n");
        }
      }
      //Remove the last comma and close off the array of arrays
      if(attemptsTableData.charAt(attemptsTableData.length() - 2) == ',') {
        attemptsTableData.delete(attemptsTableData.length()-2, attemptsTableData.length()-1);
      }
      attemptsTableData.append("]");
      html.script().$type("text/javascript").
      _("var attemptsTableData=" + attemptsTableData)._();

      tbody._()._();

    }

    protected String getAttemptId(TaskId taskId, TaskAttemptInfo ta) {
      return ta.getId();
    }

    protected boolean isValidRequest() {
      return app.getTask() != null;
    }

    protected Collection<TaskAttempt> getTaskAttempts() {
      return app.getTask().getAttempts().values();
    }
  }

  @Override protected void preHead(Page.HTML<_> html) {
    commonPreHead(html);

    set(initID(ACCORDION, "nav"), "{autoHeight:false, active:3}");
    set(DATATABLES_ID, "attempts");
    set(initID(DATATABLES, "attempts"), attemptsTableInit());
    setTableStyles(html, "attempts");
  }

  @Override protected Class<? extends SubView> content() {
    return AttemptsBlock.class;
  }

  private String attemptsTableInit() {
    return tableInit()
    .append(", 'aaData': attemptsTableData")
    .append(", bDeferRender: true")
    .append(", bProcessing: true")
    .append("\n,aoColumnDefs:[\n")

    //logs column should not filterable (it includes container ID which may pollute searches)
    .append("\n{'aTargets': [ 5 ]")
    .append(", 'bSearchable': false }")

    .append("\n, {'sType':'natural', 'aTargets': [ 0 ]")
    .append(", 'mRender': parseHadoopID }")

    .append("\n, {'sType':'numeric', 'aTargets': [ 6, 7")
    .append(" ], 'mRender': renderHadoopDate }")

    .append("\n, {'sType':'numeric', 'aTargets': [ 8")
    .append(" ], 'mRender': renderHadoopElapsedTime }]")

    // Sort by id upon page load
    .append("\n, aaSorting: [[0, 'asc']]")
    .append("}").toString();
  }
}