// Copyright 2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
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//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


// Initlialize namespaces
var devtools = devtools || {};
devtools.profiler = devtools.profiler || {};


/**
 * Creates a Profile View builder object.
 *
 * @param {number} samplingRate Number of ms between profiler ticks.
 * @constructor
 */
devtools.profiler.ViewBuilder = function(samplingRate) {
  this.samplingRate = samplingRate;
};


/**
 * Builds a profile view for the specified call tree.
 *
 * @param {devtools.profiler.CallTree} callTree A call tree.
 * @param {boolean} opt_bottomUpViewWeights Whether remapping
 *     of self weights for a bottom up view is needed.
 */
devtools.profiler.ViewBuilder.prototype.buildView = function(
    callTree, opt_bottomUpViewWeights) {
  var head;
  var samplingRate = this.samplingRate;
  callTree.traverse(function(node, viewParent) {
    var totalWeight = node.totalWeight * samplingRate;
    var selfWeight = node.selfWeight * samplingRate;
    if (opt_bottomUpViewWeights === true) {
      if (viewParent === head) {
        selfWeight = totalWeight;
      } else {
        selfWeight = 0;
      }
    }
    var viewNode = new devtools.profiler.ProfileView.Node(
        node.label, totalWeight, selfWeight, head);
    if (viewParent) {
      viewParent.addChild(viewNode);
    } else {
      head = viewNode;
    }
    return viewNode;
  });
  var view = new devtools.profiler.ProfileView(head);
  return view;
};


/**
 * Creates a Profile View object. It allows to perform sorting
 * and filtering actions on the profile. Profile View mimicks
 * the Profile object from WebKit's JSC profiler.
 *
 * @param {devtools.profiler.ProfileView.Node} head Head (root) node.
 * @constructor
 */
devtools.profiler.ProfileView = function(head) {
  this.head = head;
  this.title = '';
  this.uid = '';
  this.heavyProfile = null;
  this.treeProfile = null;
  this.flatProfile = null;
};


/**
 * Sorts the profile view using the specified sort function.
 *
 * @param {function(devtools.profiler.ProfileView.Node,
 *     devtools.profiler.ProfileView.Node):number} sortFunc A sorting
 *     functions. Must comply with Array.sort sorting function requirements.
 */
devtools.profiler.ProfileView.prototype.sort = function(sortFunc) {
  this.traverse(function (node) {
    node.sortChildren(sortFunc);
  });
};


/**
 * Traverses profile view nodes in preorder.
 *
 * @param {function(devtools.profiler.ProfileView.Node)} f Visitor function.
 */
devtools.profiler.ProfileView.prototype.traverse = function(f) {
  var nodesToTraverse = new ConsArray();
  nodesToTraverse.concat([this.head]);
  while (!nodesToTraverse.atEnd()) {
    var node = nodesToTraverse.next();
    f(node);
    nodesToTraverse.concat(node.children);
  }
};


/**
 * Constructs a Profile View node object. Each node object corresponds to
 * a function call.
 *
 * @param {string} internalFuncName A fully qualified function name.
 * @param {number} totalTime Amount of time that application spent in the
 *     corresponding function and its descendants (not that depending on
 *     profile they can be either callees or callers.)
 * @param {number} selfTime Amount of time that application spent in the
 *     corresponding function only.
 * @param {devtools.profiler.ProfileView.Node} head Profile view head.
 * @constructor
 */
devtools.profiler.ProfileView.Node = function(
    internalFuncName, totalTime, selfTime, head) {
  this.callIdentifier = 0;
  this.internalFuncName = internalFuncName;
  this.initFuncInfo();
  this.totalTime = totalTime;
  this.selfTime = selfTime;
  this.head = head;
  this.parent = null;
  this.children = [];
  this.visible = true;
};


/**
 * RegEx for stripping V8's prefixes of compiled functions.
 */
devtools.profiler.ProfileView.Node.FUNC_NAME_STRIP_RE =
    /^(?:LazyCompile|Function): (.*)$/;


/**
 * RegEx for extracting script source URL and line number.
 */
devtools.profiler.ProfileView.Node.FUNC_NAME_PARSE_RE = /^([^ ]+) (.*):(\d+)$/;


/**
 * RegEx for removing protocol name from URL.
 */
devtools.profiler.ProfileView.Node.URL_PARSE_RE = /^(?:http:\/)?.*\/([^/]+)$/;


/**
 * Inits 'functionName', 'url', and 'lineNumber' fields using 'internalFuncName'
 * field.
 */
devtools.profiler.ProfileView.Node.prototype.initFuncInfo = function() {
  var nodeAlias = devtools.profiler.ProfileView.Node;
  this.functionName = this.internalFuncName;

  var strippedName = nodeAlias.FUNC_NAME_STRIP_RE.exec(this.functionName);
  if (strippedName) {
    this.functionName = strippedName[1];
  }

  var parsedName = nodeAlias.FUNC_NAME_PARSE_RE.exec(this.functionName);
  if (parsedName) {
    this.url = parsedName[2];
    var parsedUrl = nodeAlias.URL_PARSE_RE.exec(this.url);
    if (parsedUrl) {
      this.url = parsedUrl[1];
    }
    this.functionName = parsedName[1];
    this.lineNumber = parsedName[3];
  } else {
    this.url = '';
    this.lineNumber = 0;
  }
};


/**
 * Returns a share of the function's total time in application's total time.
 */
devtools.profiler.ProfileView.Node.prototype.__defineGetter__(
    'totalPercent',
    function() { return this.totalTime /
      (this.head ? this.head.totalTime : this.totalTime) * 100.0; });


/**
 * Returns a share of the function's self time in application's total time.
 */
devtools.profiler.ProfileView.Node.prototype.__defineGetter__(
    'selfPercent',
    function() { return this.selfTime /
      (this.head ? this.head.totalTime : this.totalTime) * 100.0; });


/**
 * Returns a share of the function's total time in its parent's total time.
 */
devtools.profiler.ProfileView.Node.prototype.__defineGetter__(
    'parentTotalPercent',
    function() { return this.totalTime /
      (this.parent ? this.parent.totalTime : this.totalTime) * 100.0; });


/**
 * Adds a child to the node.
 *
 * @param {devtools.profiler.ProfileView.Node} node Child node.
 */
devtools.profiler.ProfileView.Node.prototype.addChild = function(node) {
  node.parent = this;
  this.children.push(node);
};


/**
 * Sorts all the node's children recursively.
 *
 * @param {function(devtools.profiler.ProfileView.Node,
 *     devtools.profiler.ProfileView.Node):number} sortFunc A sorting
 *     functions. Must comply with Array.sort sorting function requirements.
 */
devtools.profiler.ProfileView.Node.prototype.sortChildren = function(
    sortFunc) {
  this.children.sort(sortFunc);
};