/*jshint unused: false */
/* global arango */
'use strict';

////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2013 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
////////////////////////////////////////////////////////////////////////////////

const arangosh = require("@arangodb/arangosh");
const printf = require("internal").printf;

const colors = require("internal").COLORS;
const BLUE = colors.COLOR_BLUE;
const RED = colors.COLOR_RED;
const GREEN = colors.COLOR_GREEN;
const CYAN = colors.COLOR_CYAN;
const RESET = colors.COLOR_RESET;

////////////////////////////////////////////////////////////////////////////////
/// @brief fills left
////////////////////////////////////////////////////////////////////////////////

const fillL = function(s, w) {
  if (s.length >= w) {
    return s;
  }

  return (new Array(w - s.length + 1)).join(" ") + s;
};

////////////////////////////////////////////////////////////////////////////////
/// @brief fills right
////////////////////////////////////////////////////////////////////////////////

const fillR = function(s, w) {
  if (s.length >= w) {
    return s;
  }

  return s + (new Array(w - s.length + 1)).join(" ");
};

////////////////////////////////////////////////////////////////////////////////
/// @brief generates work description
////////////////////////////////////////////////////////////////////////////////

const workDescription = function(level, w, desc, now) {
  const t = w.type;

  desc.level = level;

  if (level === 0) {
    desc.root = desc;
  }

  desc.level = level;

  if (t === "thread") {
    desc.root.thread = w.name;

    desc.type = "thread";
    desc.name = "";
    desc.info = "";
  } else if (t === "AQL query") {
    desc.type = "aql";
    desc.name = GREEN + "AQL" + RESET;
    desc.info = w.description;
  } else if (t === "http-handler") {
    desc.type = "request";
    desc.name = GREEN + "REQUEST" + RESET;
    desc.info = w.method + " " + w.url + " (" + w.protocol + ")";

    desc = desc.child = {
      root: desc.root, level: desc.level, type: "variable",
      name: CYAN + "runtime" + RESET,
      info: (now - w.startTime).toFixed(2) + " sec"
    };

    desc = desc.child = {
      root: desc.root, level: desc.level, type: "variable",
      name: CYAN + "client " + RESET,
      info: w.client.address + ":" + w.client.port
    };
} else {
    desc.type = "unknown";
    desc.name = RED + t + RESET;
    desc.info = "";
  }

  if (w.hasOwnProperty('parent')) {
    desc.child = {
      root: desc.root
    };
    workDescription(level + 1, w.parent, desc.child, now);
  }
};

////////////////////////////////////////////////////////////////////////////////
/// @brief outputs work description
////////////////////////////////////////////////////////////////////////////////

const outputWorkDescription = function(desc, opts) {
  let line = "";

  if (desc.level > 0 && desc.type === "thread") {
    return;
  }

  line += BLUE;

  if (desc.level === 0) {
    line += fillR(desc.thread, opts.width);
  } else {
    line += fillR("", opts.width);;
  }

  line += RESET + fillR("", 2 * desc.level + 1) + desc.name;
  line += " " + desc.info;

  print(line);

  if (desc.hasOwnProperty("child")) {
    outputWorkDescription(desc.child, opts);
  }
};

////////////////////////////////////////////////////////////////////////////////
/// @brief request work information
////////////////////////////////////////////////////////////////////////////////

const workOverview = function() {
  const res = arango.GET("/_admin/work-monitor");
  arangosh.checkRequestResult(res);

  const work = res.work;

  let descs = [];
  let w1 = 0;
  const now = res.time;

  work.forEach(function(w) {
    let desc = {};

    workDescription(0, w, desc, now);
    descs.push(desc);

    w1 = Math.max(w1, desc.thread.length);
  });

  descs.forEach(function(d) {
    outputWorkDescription(d, {
      width: w1
    });
  });
};

////////////////////////////////////////////////////////////////////////////////
/// @brief exports
////////////////////////////////////////////////////////////////////////////////

exports.workOverview = workOverview;