/*
 * Copyright 2012 LinkedIn Corp.
 *
 * Licensed 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.
 */

$.namespace('azkaban');

var handleJobMenuClick = function (action, el, pos) {
  var jobid = el[0].jobid;
  var requestURL = contextURL + "/manager?project=" + projectName + "&flow="
      + flowName + "&job=" + jobid;
  if (action == "open") {
    window.location.href = requestURL;
  }
  else if (action == "openwindow") {
    window.open(requestURL);
  }
}

var statusView;
azkaban.StatusView = Backbone.View.extend({
  initialize: function (settings) {
    this.model.bind('change:graph', this.render, this);
    this.model.bind('change:update', this.statusUpdate, this);
  },
  render: function (evt) {
    var data = this.model.get("data");

    var user = data.submitUser;
    $("#submitUser").text(user);

    this.statusUpdate(evt);
  },

  statusUpdate: function (evt) {
    var data = this.model.get("data");

    statusItem = $("#flowStatus");
    for (var j = 0; j < statusList.length; ++j) {
      var status = statusList[j];
      statusItem.removeClass(status);
    }
    $("#flowStatus").addClass(data.status);
    $("#flowStatus").text(data.status);

    var startTime = data.startTime;
    var endTime = data.endTime;

    if (!startTime || startTime == -1) {
      $("#startTime").text("-");
    }
    else {
      var date = new Date(startTime);
      $("#startTime").text(getDateFormat(date));

      var lastTime = endTime;
      if (endTime == -1) {
        var currentDate = new Date();
        lastTime = currentDate.getTime();
      }

      var durationString = getDuration(startTime, lastTime);
      $("#duration").text(durationString);
    }

    if (!endTime || endTime == -1) {
      $("#endTime").text("-");
    }
    else {
      var date = new Date(endTime);
      $("#endTime").text(getDateFormat(date));
    }
  }
});

var flowTabView;
azkaban.FlowTabView = Backbone.View.extend({
  events: {
    "click #graphViewLink": "handleGraphLinkClick",
    "click #jobslistViewLink": "handleJobslistLinkClick",
    "click #flowLogViewLink": "handleLogLinkClick",
    "click #statsViewLink": "handleStatsLinkClick",
    "click #cancelbtn": "handleCancelClick",
    "click #executebtn": "handleRestartClick",
    "click #pausebtn": "handlePauseClick",
    "click #resumebtn": "handleResumeClick",
    "click #retrybtn": "handleRetryClick"
  },

  initialize: function (settings) {
    $("#cancelbtn").hide();
    $("#executebtn").hide();
    $("#pausebtn").hide();
    $("#resumebtn").hide();
    $("#retrybtn").hide();

    this.model.bind('change:graph', this.handleFlowStatusChange, this);
    this.model.bind('change:update', this.handleFlowStatusChange, this);

    var selectedView = settings.selectedView;
    if (selectedView == "jobslist") {
      this.handleJobslistLinkClick();
    }
    else {
      this.handleGraphLinkClick();
    }
  },

  render: function () {
    console.log("render graph");
  },

  handleGraphLinkClick: function () {
    $("#jobslistViewLink").removeClass("active");
    $("#graphViewLink").addClass("active");
    $("#flowLogViewLink").removeClass("active");
    $("#statsViewLink").removeClass("active");

    $("#jobListView").hide();
    $("#graphView").show();
    $("#flowLogView").hide();
    $("#statsView").hide();
  },

  handleJobslistLinkClick: function () {
    $("#graphViewLink").removeClass("active");
    $("#jobslistViewLink").addClass("active");
    $("#flowLogViewLink").removeClass("active");
    $("#statsViewLink").removeClass("active");

    $("#graphView").hide();
    $("#jobListView").show();
    $("#flowLogView").hide();
    $("#statsView").hide();
  },

  handleLogLinkClick: function () {
    $("#graphViewLink").removeClass("active");
    $("#jobslistViewLink").removeClass("active");
    $("#flowLogViewLink").addClass("active");
    $("#statsViewLink").removeClass("active");

    $("#graphView").hide();
    $("#jobListView").hide();
    $("#flowLogView").show();
    $("#statsView").hide();
  },

  handleStatsLinkClick: function () {
    $("#graphViewLink").removeClass("active");
    $("#jobslistViewLink").removeClass("active");
    $("#flowLogViewLink").removeClass("active");
    $("#statsViewLink").addClass("active");

    $("#graphView").hide();
    $("#jobListView").hide();
    $("#flowLogView").hide();
    statsView.show();
    $("#statsView").show();
  },

  handleFlowStatusChange: function () {
    var data = this.model.get("data");
    $("#cancelbtn").hide();
    $("#executebtn").hide();
    $("#pausebtn").hide();
    $("#resumebtn").hide();
    $("#retrybtn").hide();

    if (data.status == "SUCCEEDED") {
      $("#executebtn").show();
    }
    else if (data.status == "PREPARING") {
      $("#cancelbtn").show();
    }
    else if (data.status == "FAILED") {
      $("#executebtn").show();
    }
    else if (data.status == "FAILED_FINISHING") {
      $("#cancelbtn").show();
      $("#executebtn").hide();
      $("#retrybtn").show();
    }
    else if (data.status == "RUNNING") {
      $("#cancelbtn").show();
      $("#pausebtn").show();
    }
    else if (data.status == "PAUSED") {
      $("#cancelbtn").show();
      $("#resumebtn").show();
    }
    else if (data.status == "WAITING") {
      $("#cancelbtn").show();
    }
    else if (data.status == "KILLED") {
      $("#executebtn").show();
    }
  },

  handleCancelClick: function (evt) {
    var requestURL = contextURL + "/executor";
    var requestData = {"execid": execId, "ajax": "cancelFlow"};
    var successHandler = function (data) {
      console.log("cancel clicked");
      if (data.error) {
        showDialog("Error", data.error);
      }
      else {
        showDialog("Cancelled", "Flow has been cancelled.");
        setTimeout(function () {
          updateStatus();
        }, 1100);
      }
    };
    ajaxCall(requestURL, requestData, successHandler);
  },

  handleRetryClick: function (evt) {
    var graphData = graphModel.get("data");
    var requestURL = contextURL + "/executor";
    var requestData = {"execid": execId, "ajax": "retryFailedJobs"};
    var successHandler = function (data) {
      console.log("cancel clicked");
      if (data.error) {
        showDialog("Error", data.error);
      }
      else {
        showDialog("Retry", "Flow has been retried.");
        setTimeout(function () {
          updateStatus();
        }, 1100);
      }
    };
    ajaxCall(requestURL, requestData, successHandler);
  },

  handleRestartClick: function (evt) {
    console.log("handleRestartClick");
    var data = graphModel.get("data");

    var executingData = {
      project: projectName,
      ajax: "executeFlow",
      flow: flowId,
      execid: execId,
      exgraph: data
    };
    flowExecuteDialogView.show(executingData);
  },

  handlePauseClick: function (evt) {
    var requestURL = contextURL + "/executor";
    var requestData = {"execid": execId, "ajax": "pauseFlow"};
    var successHandler = function (data) {
      console.log("pause clicked");
      if (data.error) {
        showDialog("Error", data.error);
      }
      else {
        showDialog("Paused", "Flow has been paused.");
        setTimeout(function () {
          updateStatus();
        }, 1100);
      }
    };
    ajaxCall(requestURL, requestData, successHandler);
  },

  handleResumeClick: function (evt) {
    var requestURL = contextURL + "/executor";
    var requestData = {"execid": execId, "ajax": "resumeFlow"};
    var successHandler = function (data) {
      console.log("pause clicked");
      if (data.error) {
        showDialog("Error", data.error);
      }
      else {
        showDialog("Resumed", "Flow has been resumed.");
        setTimeout(function () {
          updateStatus();
        }, 1100);
      }
    };
    ajaxCall(requestURL, requestData, successHandler);
  }
});

var showDialog = function (title, message) {
  $('#messageTitle').text(title);
  $('#messageBox').text(message);
  $('#messageDialog').modal();
}

var jobListView;
var mainSvgGraphView;

var flowLogView;
azkaban.FlowLogView = Backbone.View.extend({
  events: {
    "click #updateLogBtn": "handleUpdate"
  },
  initialize: function (settings) {
    this.model.set({"offset": 0});
    this.handleUpdate();
  },
  handleUpdate: function (evt) {
    var offset = this.model.get("offset");
    var requestURL = contextURL + "/executor";
    var model = this.model;
    console.log("fetchLogs offset is " + offset)

    $.ajax({
      async: false,
      url: requestURL,
      data: {
        "execid": execId,
        "ajax": "fetchExecFlowLogs",
        "offset": offset,
        "length": 50000
      },
      success: function (data) {
        console.log("fetchLogs");
        if (data.error) {
          console.log(data.error);
        }
        else {
          var log = $("#logSection").text();
          if (!log) {
            log = data.data;
          }
          else {
            log += data.data;
          }

          var newOffset = data.offset + data.length;

          $("#logSection").text(log);
          model.set({"offset": newOffset, "log": log});
          $(".logViewer").scrollTop(9999);
        }
      }
    });
  }
});

var statsView;
azkaban.StatsView = Backbone.View.extend({
  events: {},

  initialize: function (settings) {
    this.model.bind('change:graph', this.statusUpdate, this);
    this.model.bind('change:update', this.statusUpdate, this);
    this.model.bind('render', this.render, this);
    this.status = null;
    this.rendered = false;
  },

  statusUpdate: function (evt) {
    var data = this.model.get('data');
    this.status = data.status;
  },

  show: function () {
    this.model.trigger("render");
  },

  render: function (evt) {
    if (this.rendered == true) {
      return;
    }
    if (this.status != 'SUCCEEDED') {
      return;
    }
    flowStatsView.show(execId);
    this.rendered = true;
  }
});

var graphModel;

var logModel;
azkaban.LogModel = Backbone.Model.extend({});

var updateStatus = function (updateTime) {
  var requestURL = contextURL + "/executor";
  var oldData = graphModel.get("data");
  var nodeMap = graphModel.get("nodeMap");

  if (!updateTime) {
    updateTime = oldData.updateTime ? oldData.updateTime : 0;
  }

  var requestData = {
    "execid": execId,
    "ajax": "fetchexecflowupdate",
    "lastUpdateTime": updateTime
  };

  var successHandler = function (data) {
    console.log("data updated");
    if (data.updateTime) {
      updateGraph(oldData, data);

      graphModel.set({"update": data});
      graphModel.trigger("change:update");
    }
  };
  ajaxCall(requestURL, requestData, successHandler);
}

var updateGraph = function (data, update) {
  var nodeMap = data.nodeMap;
  data.startTime = update.startTime;
  data.endTime = update.endTime;
  data.updateTime = update.updateTime;
  data.status = update.status;
  update.changedNode = data;

  if (update.nodes) {
    for (var i = 0; i < update.nodes.length; ++i) {
      var newNode = update.nodes[i];
      var oldNode = nodeMap[newNode.id];

      updateGraph(oldNode, newNode);
    }
  }
}

var updateTime = -1;
var updaterFunction = function () {
  var oldData = graphModel.get("data");
  var keepRunning =
      oldData.status != "SUCCEEDED" &&
      oldData.status != "FAILED" &&
      oldData.status != "KILLED";

  if (keepRunning) {
    updateStatus();

    var data = graphModel.get("data");
    if (data.status == "UNKNOWN" ||
        data.status == "WAITING" ||
        data.status == "PREPARING") {
      // 2 min updates
      setTimeout(function () {
        updaterFunction();
      }, 2 * 60 * 1000);
    }
    else if (data.status != "SUCCEEDED" && data.status != "FAILED") {
      // 2 min updates
      setTimeout(function () {
        updaterFunction();
      }, 2 * 60 * 1000);
    }
    else {
      console.log("Flow finished, so no more updates");
      setTimeout(function () {
        updateStatus(0);
      }, 500);
    }
  }
  else {
    console.log("Flow finished, so no more updates");
  }
}

var logUpdaterFunction = function () {
  var oldData = graphModel.get("data");
  var keepRunning =
      oldData.status != "SUCCEEDED" &&
      oldData.status != "FAILED" &&
      oldData.status != "KILLED";
  if (keepRunning) {
    // update every 2 min for the logs until finished
    flowLogView.handleUpdate();
    setTimeout(function () {
      logUpdaterFunction();
    }, 2 * 60 * 1000);
  }
  else {
    flowLogView.handleUpdate();
  }
}

var exNodeClickCallback = function (event) {
  console.log("Node clicked callback");
  var jobId = event.currentTarget.jobid;
  var requestURL = contextURL + "/manager?project=" + projectName + "&flow="
      + flowId + "&job=" + jobId;
  var visualizerURL = contextURL + "/pigvisualizer?execid=" + execId + "&jobid="
      + jobId;

  var menu = [
    {
      title: "Open Job...", callback: function () {
      window.location.href = requestURL;
    }
    },
    {
      title: "Open Job in New Window...", callback: function () {
      window.open(requestURL);
    }
    },
    {
      title: "Visualize Job...", callback: function () {
      window.location.href = visualizerURL;
    }
    }
  ];

  contextMenuView.show(event, menu);
}

var exJobClickCallback = function (event) {
  console.log("Node clicked callback");
  var jobId = event.currentTarget.jobid;
  var requestURL = contextURL + "/manager?project=" + projectName + "&flow="
      + flowId + "&job=" + jobId;
  var visualizerURL = contextURL + "/pigvisualizer?execid=" + execId + "&jobid="
      + jobId;

  var menu = [
    {
      title: "Open Job...", callback: function () {
      window.location.href = requestURL;
    }
    },
    {
      title: "Open Job in New Window...", callback: function () {
      window.open(requestURL);
    }
    },
    {
      title: "Visualize Job...", callback: function () {
      window.location.href = visualizerURL;
    }
    }
  ];

  contextMenuView.show(event, menu);
}

var exEdgeClickCallback = function (event) {
  console.log("Edge clicked callback");
}

var exGraphClickCallback = function (event) {
  console.log("Graph clicked callback");
  var requestURL = contextURL + "/manager?project=" + projectName + "&flow="
      + flowId;

  var menu = [
    {
      title: "Open Flow...", callback: function () {
      window.location.href = requestURL;
    }
    },
    {
      title: "Open Flow in New Window...", callback: function () {
      window.open(requestURL);
    }
    },
    {break: 1},
    {
      title: "Center Graph", callback: function () {
      graphModel.trigger("resetPanZoom");
    }
    }
  ];

  contextMenuView.show(event, menu);
}

var flowStatsView;
var flowStatsModel;

$(function () {
  var selected;

  graphModel = new azkaban.GraphModel();
  logModel = new azkaban.LogModel();

  flowTabView = new azkaban.FlowTabView({
    el: $('#headertabs'),
    model: graphModel
  });

  mainSvgGraphView = new azkaban.SvgGraphView({
    el: $('#svgDiv'),
    model: graphModel,
    rightClick: {
      "node": nodeClickCallback,
      "edge": edgeClickCallback,
      "graph": graphClickCallback
    }
  });

  jobsListView = new azkaban.JobListView({
    el: $('#joblist-panel'),
    model: graphModel,
    contextMenuCallback: jobClickCallback
  });

  flowLogView = new azkaban.FlowLogView({
    el: $('#flowLogView'),
    model: logModel
  });

  statusView = new azkaban.StatusView({
    el: $('#flow-status'),
    model: graphModel
  });

  flowStatsModel = new azkaban.FlowStatsModel();
  flowStatsView = new azkaban.FlowStatsView({
    el: $('#flow-stats-container'),
    model: flowStatsModel,
    histogram: false
  });

  statsView = new azkaban.StatsView({
    el: $('#statsView'),
    model: graphModel
  });

  executionListView = new azkaban.ExecutionListView({
    el: $('#jobListView'),
    model: graphModel
  });

  var requestURL = contextURL + "/executor";
  var requestData = {"execid": execId, "ajax": "fetchexecflow"};
  var successHandler = function (data) {
    console.log("data fetched");
    graphModel.addFlow(data);
    graphModel.trigger("change:graph");

    updateTime = Math.max(updateTime, data.submitTime);
    updateTime = Math.max(updateTime, data.startTime);
    updateTime = Math.max(updateTime, data.endTime);

    if (window.location.hash) {
      var hash = window.location.hash;
      if (hash == "#jobslist") {
        flowTabView.handleJobslistLinkClick();
      }
      else if (hash == "#log") {
        flowTabView.handleLogLinkClick();
      }
      else if (hash == "#stats") {
        flowTabView.handleStatsLinkClick();
      }
    }
    else {
      flowTabView.handleGraphLinkClick();
    }
    updaterFunction();
    logUpdaterFunction();
  };
  ajaxCall(requestURL, requestData, successHandler);
});
