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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.
*/

var _config = require("../config");

var __DEV__ = _config.__DEV__;

var zrUtil = require("zrender/lib/core/util");

var graphicUtil = require("../util/graphic");

var _labelHelper = require("./helper/labelHelper");

var getDefaultLabel = _labelHelper.getDefaultLabel;

var createListFromArray = require("./helper/createListFromArray");

var _barGrid = require("../layout/barGrid");

var getLayoutOnAxis = _barGrid.getLayoutOnAxis;

var DataDiffer = require("../data/DataDiffer");

var SeriesModel = require("../model/Series");

var Model = require("../model/Model");

var ChartView = require("../view/Chart");

var _createClipPathFromCoordSys = require("./helper/createClipPathFromCoordSys");

var createClipPath = _createClipPathFromCoordSys.createClipPath;

var prepareCartesian2d = require("../coord/cartesian/prepareCustom");

var prepareGeo = require("../coord/geo/prepareCustom");

var prepareSingleAxis = require("../coord/single/prepareCustom");

var preparePolar = require("../coord/polar/prepareCustom");

var prepareCalendar = require("../coord/calendar/prepareCustom");

/*
* 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.
*/
var CACHED_LABEL_STYLE_PROPERTIES = graphicUtil.CACHED_LABEL_STYLE_PROPERTIES;
var ITEM_STYLE_NORMAL_PATH = ['itemStyle'];
var ITEM_STYLE_EMPHASIS_PATH = ['emphasis', 'itemStyle'];
var LABEL_NORMAL = ['label'];
var LABEL_EMPHASIS = ['emphasis', 'label']; // Use prefix to avoid index to be the same as el.name,
// which will cause weird udpate animation.

var GROUP_DIFF_PREFIX = 'e\0\0';
/**
 * To reduce total package size of each coordinate systems, the modules `prepareCustom`
 * of each coordinate systems are not required by each coordinate systems directly, but
 * required by the module `custom`.
 *
 * prepareInfoForCustomSeries {Function}: optional
 *     @return {Object} {coordSys: {...}, api: {
 *         coord: function (data, clamp) {}, // return point in global.
 *         size: function (dataSize, dataItem) {} // return size of each axis in coordSys.
 *     }}
 */

var prepareCustoms = {
  cartesian2d: prepareCartesian2d,
  geo: prepareGeo,
  singleAxis: prepareSingleAxis,
  polar: preparePolar,
  calendar: prepareCalendar
}; // ------
// Model
// ------

SeriesModel.extend({
  type: 'series.custom',
  dependencies: ['grid', 'polar', 'geo', 'singleAxis', 'calendar'],
  defaultOption: {
    coordinateSystem: 'cartesian2d',
    // Can be set as 'none'
    zlevel: 0,
    z: 2,
    legendHoverLink: true,
    useTransform: true,
    // Custom series will not clip by default.
    // Some case will use custom series to draw label
    // For example https://echarts.apache.org/examples/en/editor.html?c=custom-gantt-flight
    // Only works on polar and cartesian2d coordinate system.
    clip: false // Cartesian coordinate system
    // xAxisIndex: 0,
    // yAxisIndex: 0,
    // Polar coordinate system
    // polarIndex: 0,
    // Geo coordinate system
    // geoIndex: 0,
    // label: {}
    // itemStyle: {}

  },

  /**
   * @override
   */
  getInitialData: function (option, ecModel) {
    return createListFromArray(this.getSource(), this);
  },

  /**
   * @override
   */
  getDataParams: function (dataIndex, dataType, el) {
    var params = SeriesModel.prototype.getDataParams.apply(this, arguments);
    el && (params.info = el.info);
    return params;
  }
}); // -----
// View
// -----

ChartView.extend({
  type: 'custom',

  /**
   * @private
   * @type {module:echarts/data/List}
   */
  _data: null,

  /**
   * @override
   */
  render: function (customSeries, ecModel, api, payload) {
    var oldData = this._data;
    var data = customSeries.getData();
    var group = this.group;
    var renderItem = makeRenderItem(customSeries, data, ecModel, api); // By default, merge mode is applied. In most cases, custom series is
    // used in the scenario that data amount is not large but graphic elements
    // is complicated, where merge mode is probably necessary for optimization.
    // For example, reuse graphic elements and only update the transform when
    // roam or data zoom according to `actionType`.

    data.diff(oldData).add(function (newIdx) {
      createOrUpdate(null, newIdx, renderItem(newIdx, payload), customSeries, group, data);
    }).update(function (newIdx, oldIdx) {
      var el = oldData.getItemGraphicEl(oldIdx);
      createOrUpdate(el, newIdx, renderItem(newIdx, payload), customSeries, group, data);
    }).remove(function (oldIdx) {
      var el = oldData.getItemGraphicEl(oldIdx);
      el && group.remove(el);
    }).execute(); // Do clipping

    var clipPath = customSeries.get('clip', true) ? createClipPath(customSeries.coordinateSystem, false, customSeries) : null;

    if (clipPath) {
      group.setClipPath(clipPath);
    } else {
      group.removeClipPath();
    }

    this._data = data;
  },
  incrementalPrepareRender: function (customSeries, ecModel, api) {
    this.group.removeAll();
    this._data = null;
  },
  incrementalRender: function (params, customSeries, ecModel, api, payload) {
    var data = customSeries.getData();
    var renderItem = makeRenderItem(customSeries, data, ecModel, api);

    function setIncrementalAndHoverLayer(el) {
      if (!el.isGroup) {
        el.incremental = true;
        el.useHoverLayer = true;
      }
    }

    for (var idx = params.start; idx < params.end; idx++) {
      var el = createOrUpdate(null, idx, renderItem(idx, payload), customSeries, this.group, data);
      el.traverse(setIncrementalAndHoverLayer);
    }
  },

  /**
   * @override
   */
  dispose: zrUtil.noop,

  /**
   * @override
   */
  filterForExposedEvent: function (eventType, query, targetEl, packedEvent) {
    var elementName = query.element;

    if (elementName == null || targetEl.name === elementName) {
      return true;
    } // Enable to give a name on a group made by `renderItem`, and listen
    // events that triggerd by its descendents.


    while ((targetEl = targetEl.parent) && targetEl !== this.group) {
      if (targetEl.name === elementName) {
        return true;
      }
    }

    return false;
  }
});

function createEl(elOption) {
  var graphicType = elOption.type;
  var el; // Those graphic elements are not shapes. They should not be
  // overwritten by users, so do them first.

  if (graphicType === 'path') {
    var shape = elOption.shape; // Using pathRect brings convenience to users sacle svg path.

    var pathRect = shape.width != null && shape.height != null ? {
      x: shape.x || 0,
      y: shape.y || 0,
      width: shape.width,
      height: shape.height
    } : null;
    var pathData = getPathData(shape); // Path is also used for icon, so layout 'center' by default.

    el = graphicUtil.makePath(pathData, null, pathRect, shape.layout || 'center');
    el.__customPathData = pathData;
  } else if (graphicType === 'image') {
    el = new graphicUtil.Image({});
    el.__customImagePath = elOption.style.image;
  } else if (graphicType === 'text') {
    el = new graphicUtil.Text({});
    el.__customText = elOption.style.text;
  } else if (graphicType === 'group') {
    el = new graphicUtil.Group();
  } else if (graphicType === 'compoundPath') {
    throw new Error('"compoundPath" is not supported yet.');
  } else {
    var Clz = graphicUtil.getShapeClass(graphicType);
    el = new Clz();
  }

  el.__customGraphicType = graphicType;
  el.name = elOption.name;
  return el;
}

function updateEl(el, dataIndex, elOption, animatableModel, data, isInit, isRoot) {
  var transitionProps = {};
  var elOptionStyle = elOption.style || {};
  elOption.shape && (transitionProps.shape = zrUtil.clone(elOption.shape));
  elOption.position && (transitionProps.position = elOption.position.slice());
  elOption.scale && (transitionProps.scale = elOption.scale.slice());
  elOption.origin && (transitionProps.origin = elOption.origin.slice());
  elOption.rotation && (transitionProps.rotation = elOption.rotation);

  if (el.type === 'image' && elOption.style) {
    var targetStyle = transitionProps.style = {};
    zrUtil.each(['x', 'y', 'width', 'height'], function (prop) {
      prepareStyleTransition(prop, targetStyle, elOptionStyle, el.style, isInit);
    });
  }

  if (el.type === 'text' && elOption.style) {
    var targetStyle = transitionProps.style = {};
    zrUtil.each(['x', 'y'], function (prop) {
      prepareStyleTransition(prop, targetStyle, elOptionStyle, el.style, isInit);
    }); // Compatible with previous: both support
    // textFill and fill, textStroke and stroke in 'text' element.

    !elOptionStyle.hasOwnProperty('textFill') && elOptionStyle.fill && (elOptionStyle.textFill = elOptionStyle.fill);
    !elOptionStyle.hasOwnProperty('textStroke') && elOptionStyle.stroke && (elOptionStyle.textStroke = elOptionStyle.stroke);
  }

  if (el.type !== 'group') {
    el.useStyle(elOptionStyle); // Init animation.

    if (isInit) {
      el.style.opacity = 0;
      var targetOpacity = elOptionStyle.opacity;
      targetOpacity == null && (targetOpacity = 1);
      graphicUtil.initProps(el, {
        style: {
          opacity: targetOpacity
        }
      }, animatableModel, dataIndex);
    }
  }

  if (isInit) {
    el.attr(transitionProps);
  } else {
    graphicUtil.updateProps(el, transitionProps, animatableModel, dataIndex);
  } // Merge by default.
  // z2 must not be null/undefined, otherwise sort error may occur.


  elOption.hasOwnProperty('z2') && el.attr('z2', elOption.z2 || 0);
  elOption.hasOwnProperty('silent') && el.attr('silent', elOption.silent);
  elOption.hasOwnProperty('invisible') && el.attr('invisible', elOption.invisible);
  elOption.hasOwnProperty('ignore') && el.attr('ignore', elOption.ignore); // `elOption.info` enables user to mount some info on
  // elements and use them in event handlers.
  // Update them only when user specified, otherwise, remain.

  elOption.hasOwnProperty('info') && el.attr('info', elOption.info); // If `elOption.styleEmphasis` is `false`, remove hover style. The
  // logic is ensured by `graphicUtil.setElementHoverStyle`.

  var styleEmphasis = elOption.styleEmphasis; // hoverStyle should always be set here, because if the hover style
  // may already be changed, where the inner cache should be reset.

  graphicUtil.setElementHoverStyle(el, styleEmphasis);

  if (isRoot) {
    graphicUtil.setAsHighDownDispatcher(el, styleEmphasis !== false);
  }
}

function prepareStyleTransition(prop, targetStyle, elOptionStyle, oldElStyle, isInit) {
  if (elOptionStyle[prop] != null && !isInit) {
    targetStyle[prop] = elOptionStyle[prop];
    elOptionStyle[prop] = oldElStyle[prop];
  }
}

function makeRenderItem(customSeries, data, ecModel, api) {
  var renderItem = customSeries.get('renderItem');
  var coordSys = customSeries.coordinateSystem;
  var prepareResult = {};

  if (coordSys) {
    prepareResult = coordSys.prepareCustoms ? coordSys.prepareCustoms() : prepareCustoms[coordSys.type](coordSys);
  }

  var userAPI = zrUtil.defaults({
    getWidth: api.getWidth,
    getHeight: api.getHeight,
    getZr: api.getZr,
    getDevicePixelRatio: api.getDevicePixelRatio,
    value: value,
    style: style,
    styleEmphasis: styleEmphasis,
    visual: visual,
    barLayout: barLayout,
    currentSeriesIndices: currentSeriesIndices,
    font: font
  }, prepareResult.api || {});
  var userParams = {
    // The life cycle of context: current round of rendering.
    // The global life cycle is probably not necessary, because
    // user can store global status by themselves.
    context: {},
    seriesId: customSeries.id,
    seriesName: customSeries.name,
    seriesIndex: customSeries.seriesIndex,
    coordSys: prepareResult.coordSys,
    dataInsideLength: data.count(),
    encode: wrapEncodeDef(customSeries.getData())
  }; // Do not support call `api` asynchronously without dataIndexInside input.

  var currDataIndexInside;
  var currDirty = true;
  var currItemModel;
  var currLabelNormalModel;
  var currLabelEmphasisModel;
  var currVisualColor;
  return function (dataIndexInside, payload) {
    currDataIndexInside = dataIndexInside;
    currDirty = true;
    return renderItem && renderItem(zrUtil.defaults({
      dataIndexInside: dataIndexInside,
      dataIndex: data.getRawIndex(dataIndexInside),
      // Can be used for optimization when zoom or roam.
      actionType: payload ? payload.type : null
    }, userParams), userAPI);
  }; // Do not update cache until api called.

  function updateCache(dataIndexInside) {
    dataIndexInside == null && (dataIndexInside = currDataIndexInside);

    if (currDirty) {
      currItemModel = data.getItemModel(dataIndexInside);
      currLabelNormalModel = currItemModel.getModel(LABEL_NORMAL);
      currLabelEmphasisModel = currItemModel.getModel(LABEL_EMPHASIS);
      currVisualColor = data.getItemVisual(dataIndexInside, 'color');
      currDirty = false;
    }
  }
  /**
   * @public
   * @param {number|string} dim
   * @param {number} [dataIndexInside=currDataIndexInside]
   * @return {number|string} value
   */


  function value(dim, dataIndexInside) {
    dataIndexInside == null && (dataIndexInside = currDataIndexInside);
    return data.get(data.getDimension(dim || 0), dataIndexInside);
  }
  /**
   * By default, `visual` is applied to style (to support visualMap).
   * `visual.color` is applied at `fill`. If user want apply visual.color on `stroke`,
   * it can be implemented as:
   * `api.style({stroke: api.visual('color'), fill: null})`;
   * @public
   * @param {Object} [extra]
   * @param {number} [dataIndexInside=currDataIndexInside]
   */


  function style(extra, dataIndexInside) {
    dataIndexInside == null && (dataIndexInside = currDataIndexInside);
    updateCache(dataIndexInside);
    var itemStyle = currItemModel.getModel(ITEM_STYLE_NORMAL_PATH).getItemStyle();
    currVisualColor != null && (itemStyle.fill = currVisualColor);
    var opacity = data.getItemVisual(dataIndexInside, 'opacity');
    opacity != null && (itemStyle.opacity = opacity);
    var labelModel = extra ? applyExtraBefore(extra, currLabelNormalModel) : currLabelNormalModel;
    graphicUtil.setTextStyle(itemStyle, labelModel, null, {
      autoColor: currVisualColor,
      isRectText: true
    });
    itemStyle.text = labelModel.getShallow('show') ? zrUtil.retrieve2(customSeries.getFormattedLabel(dataIndexInside, 'normal'), getDefaultLabel(data, dataIndexInside)) : null;
    extra && applyExtraAfter(itemStyle, extra);
    return itemStyle;
  }
  /**
   * @public
   * @param {Object} [extra]
   * @param {number} [dataIndexInside=currDataIndexInside]
   */


  function styleEmphasis(extra, dataIndexInside) {
    dataIndexInside == null && (dataIndexInside = currDataIndexInside);
    updateCache(dataIndexInside);
    var itemStyle = currItemModel.getModel(ITEM_STYLE_EMPHASIS_PATH).getItemStyle();
    var labelModel = extra ? applyExtraBefore(extra, currLabelEmphasisModel) : currLabelEmphasisModel;
    graphicUtil.setTextStyle(itemStyle, labelModel, null, {
      isRectText: true
    }, true);
    itemStyle.text = labelModel.getShallow('show') ? zrUtil.retrieve3(customSeries.getFormattedLabel(dataIndexInside, 'emphasis'), customSeries.getFormattedLabel(dataIndexInside, 'normal'), getDefaultLabel(data, dataIndexInside)) : null;
    extra && applyExtraAfter(itemStyle, extra);
    return itemStyle;
  }
  /**
   * @public
   * @param {string} visualType
   * @param {number} [dataIndexInside=currDataIndexInside]
   */


  function visual(visualType, dataIndexInside) {
    dataIndexInside == null && (dataIndexInside = currDataIndexInside);
    return data.getItemVisual(dataIndexInside, visualType);
  }
  /**
   * @public
   * @param {number} opt.count Positive interger.
   * @param {number} [opt.barWidth]
   * @param {number} [opt.barMaxWidth]
   * @param {number} [opt.barMinWidth]
   * @param {number} [opt.barGap]
   * @param {number} [opt.barCategoryGap]
   * @return {Object} {width, offset, offsetCenter} is not support, return undefined.
   */


  function barLayout(opt) {
    if (coordSys.getBaseAxis) {
      var baseAxis = coordSys.getBaseAxis();
      return getLayoutOnAxis(zrUtil.defaults({
        axis: baseAxis
      }, opt), api);
    }
  }
  /**
   * @public
   * @return {Array.<number>}
   */


  function currentSeriesIndices() {
    return ecModel.getCurrentSeriesIndices();
  }
  /**
   * @public
   * @param {Object} opt
   * @param {string} [opt.fontStyle]
   * @param {number} [opt.fontWeight]
   * @param {number} [opt.fontSize]
   * @param {string} [opt.fontFamily]
   * @return {string} font string
   */


  function font(opt) {
    return graphicUtil.getFont(opt, ecModel);
  }
}

function wrapEncodeDef(data) {
  var encodeDef = {};
  zrUtil.each(data.dimensions, function (dimName, dataDimIndex) {
    var dimInfo = data.getDimensionInfo(dimName);

    if (!dimInfo.isExtraCoord) {
      var coordDim = dimInfo.coordDim;
      var dataDims = encodeDef[coordDim] = encodeDef[coordDim] || [];
      dataDims[dimInfo.coordDimIndex] = dataDimIndex;
    }
  });
  return encodeDef;
}

function createOrUpdate(el, dataIndex, elOption, animatableModel, group, data) {
  el = doCreateOrUpdate(el, dataIndex, elOption, animatableModel, group, data, true);
  el && data.setItemGraphicEl(dataIndex, el);
  return el;
}

function doCreateOrUpdate(el, dataIndex, elOption, animatableModel, group, data, isRoot) {
  // [Rule]
  // By default, follow merge mode.
  //     (It probably brings benifit for performance in some cases of large data, where
  //     user program can be optimized to that only updated props needed to be re-calculated,
  //     or according to `actionType` some calculation can be skipped.)
  // If `renderItem` returns `null`/`undefined`/`false`, remove the previous el if existing.
  //     (It seems that violate the "merge" principle, but most of users probably intuitively
  //     regard "return;" as "show nothing element whatever", so make a exception to meet the
  //     most cases.)
  var simplyRemove = !elOption; // `null`/`undefined`/`false`

  elOption = elOption || {};
  var elOptionType = elOption.type;
  var elOptionShape = elOption.shape;
  var elOptionStyle = elOption.style;

  if (el && (simplyRemove // || elOption.$merge === false
  // If `elOptionType` is `null`, follow the merge principle.
  || elOptionType != null && elOptionType !== el.__customGraphicType || elOptionType === 'path' && hasOwnPathData(elOptionShape) && getPathData(elOptionShape) !== el.__customPathData || elOptionType === 'image' && hasOwn(elOptionStyle, 'image') && elOptionStyle.image !== el.__customImagePath // FIXME test and remove this restriction?
  || elOptionType === 'text' && hasOwn(elOptionShape, 'text') && elOptionStyle.text !== el.__customText)) {
    group.remove(el);
    el = null;
  } // `elOption.type` is undefined when `renderItem` returns nothing.


  if (simplyRemove) {
    return;
  }

  var isInit = !el;
  !el && (el = createEl(elOption));
  updateEl(el, dataIndex, elOption, animatableModel, data, isInit, isRoot);

  if (elOptionType === 'group') {
    mergeChildren(el, dataIndex, elOption, animatableModel, data);
  } // Always add whatever already added to ensure sequence.


  group.add(el);
  return el;
} // Usage:
// (1) By default, `elOption.$mergeChildren` is `'byIndex'`, which indicates that
//     the existing children will not be removed, and enables the feature that
//     update some of the props of some of the children simply by construct
//     the returned children of `renderItem` like:
//     `var children = group.children = []; children[3] = {opacity: 0.5};`
// (2) If `elOption.$mergeChildren` is `'byName'`, add/update/remove children
//     by child.name. But that might be lower performance.
// (3) If `elOption.$mergeChildren` is `false`, the existing children will be
//     replaced totally.
// (4) If `!elOption.children`, following the "merge" principle, nothing will happen.
//
// For implementation simpleness, do not provide a direct way to remove sinlge
// child (otherwise the total indicies of the children array have to be modified).
// User can remove a single child by set its `ignore` as `true` or replace
// it by another element, where its `$merge` can be set as `true` if necessary.


function mergeChildren(el, dataIndex, elOption, animatableModel, data) {
  var newChildren = elOption.children;
  var newLen = newChildren ? newChildren.length : 0;
  var mergeChildren = elOption.$mergeChildren; // `diffChildrenByName` has been deprecated.

  var byName = mergeChildren === 'byName' || elOption.diffChildrenByName;
  var notMerge = mergeChildren === false; // For better performance on roam update, only enter if necessary.

  if (!newLen && !byName && !notMerge) {
    return;
  }

  if (byName) {
    diffGroupChildren({
      oldChildren: el.children() || [],
      newChildren: newChildren || [],
      dataIndex: dataIndex,
      animatableModel: animatableModel,
      group: el,
      data: data
    });
    return;
  }

  notMerge && el.removeAll(); // Mapping children of a group simply by index, which
  // might be better performance.

  var index = 0;

  for (; index < newLen; index++) {
    newChildren[index] && doCreateOrUpdate(el.childAt(index), dataIndex, newChildren[index], animatableModel, el, data);
  }
}

function diffGroupChildren(context) {
  new DataDiffer(context.oldChildren, context.newChildren, getKey, getKey, context).add(processAddUpdate).update(processAddUpdate).remove(processRemove).execute();
}

function getKey(item, idx) {
  var name = item && item.name;
  return name != null ? name : GROUP_DIFF_PREFIX + idx;
}

function processAddUpdate(newIndex, oldIndex) {
  var context = this.context;
  var childOption = newIndex != null ? context.newChildren[newIndex] : null;
  var child = oldIndex != null ? context.oldChildren[oldIndex] : null;
  doCreateOrUpdate(child, context.dataIndex, childOption, context.animatableModel, context.group, context.data);
} // `graphic#applyDefaultTextStyle` will cache
// textFill, textStroke, textStrokeWidth.
// We have to do this trick.


function applyExtraBefore(extra, model) {
  var dummyModel = new Model({}, model);
  zrUtil.each(CACHED_LABEL_STYLE_PROPERTIES, function (stylePropName, modelPropName) {
    if (extra.hasOwnProperty(stylePropName)) {
      dummyModel.option[modelPropName] = extra[stylePropName];
    }
  });
  return dummyModel;
}

function applyExtraAfter(itemStyle, extra) {
  for (var key in extra) {
    if (extra.hasOwnProperty(key) || !CACHED_LABEL_STYLE_PROPERTIES.hasOwnProperty(key)) {
      itemStyle[key] = extra[key];
    }
  }
}

function processRemove(oldIndex) {
  var context = this.context;
  var child = context.oldChildren[oldIndex];
  child && context.group.remove(child);
}

function getPathData(shape) {
  // "d" follows the SVG convention.
  return shape && (shape.pathData || shape.d);
}

function hasOwnPathData(shape) {
  return shape && (shape.hasOwnProperty('pathData') || shape.hasOwnProperty('d'));
}

function hasOwn(host, prop) {
  return host && host.hasOwnProperty(prop);
}