var util = require('../../util');
var DOMutil = require('../../DOMutil');

/**
 * /**
 * @param {object} group            | the object of the group from the dataset
 * @param {string} groupId          | ID of the group
 * @param {object} options          | the default options
 * @param {array} groupsUsingDefaultStyles  | this array has one entree.
 *                                            It is passed as an array so it is passed by reference.
 *                                            It enumerates through the default styles
 * @constructor
 */
function GraphGroup(group, groupId, options, groupsUsingDefaultStyles) {
  this.id = groupId;
  var fields = ['sampling', 'style', 'sort', 'yAxisOrientation', 'barChart', 'drawPoints', 'shaded', 'interpolation'];
  this.options = util.selectiveBridgeObject(fields, options);
  this.usingDefaultStyle = group.className === undefined;
  this.groupsUsingDefaultStyles = groupsUsingDefaultStyles;
  this.zeroPosition = 0;
  this.update(group);
  if (this.usingDefaultStyle == true) {
    this.groupsUsingDefaultStyles[0] += 1;
  }
  this.itemsData = [];
  this.visible = group.visible === undefined ? true : group.visible;
}

function insertionSort (a,compare) {
  for (var i = 0; i < a.length; i++) {
    var k = a[i];
    for (var j = i; j > 0 && compare(k,a[j - 1])<0; j--) {
      a[j] = a[j - 1];
    }
    a[j] = k;
  }
  return a;
}

/**
 * this loads a reference to all items in this group into this group.
 * @param {array} items
 */
GraphGroup.prototype.setItems = function (items) {
  if (items != null) {
    this.itemsData = items;
    if (this.options.sort == true) {
      insertionSort(this.itemsData,function (a, b) {
        return a.x > b.x ? 1 : -1;
      });
    }
  }
  else {
    this.itemsData = [];
  }
};

GraphGroup.prototype.getItems = function () {
  return this.itemsData;
}

/**
 * this is used for barcharts and shading, this way, we only have to calculate it once.
 * @param pos
 */
GraphGroup.prototype.setZeroPosition = function (pos) {
  this.zeroPosition = pos;
};

/**
 * set the options of the graph group over the default options.
 * @param options
 */
GraphGroup.prototype.setOptions = function (options) {
  if (options !== undefined) {
    var fields = ['sampling', 'style', 'sort', 'yAxisOrientation', 'barChart', 'excludeFromLegend', 'excludeFromStacking'];
    util.selectiveDeepExtend(fields, this.options, options);

    // if the group's drawPoints is a function delegate the callback to the onRender property
    if (typeof options.drawPoints == 'function') {
      options.drawPoints = {
        onRender: options.drawPoints
      }
    }

    util.mergeOptions(this.options, options, 'interpolation');
    util.mergeOptions(this.options, options, 'drawPoints');
    util.mergeOptions(this.options, options, 'shaded');

    if (options.interpolation) {
      if (typeof options.interpolation == 'object') {
        if (options.interpolation.parametrization) {
          if (options.interpolation.parametrization == 'uniform') {
            this.options.interpolation.alpha = 0;
          }
          else if (options.interpolation.parametrization == 'chordal') {
            this.options.interpolation.alpha = 1.0;
          }
          else {
            this.options.interpolation.parametrization = 'centripetal';
            this.options.interpolation.alpha = 0.5;
          }
        }
      }
    }
  }
};


/**
 * this updates the current group class with the latest group dataset entree, used in _updateGroup in linegraph
 * @param group
 */
GraphGroup.prototype.update = function (group) {
  this.group = group;
  this.content = group.content || 'graph';
  this.className = group.className || this.className || 'vis-graph-group' + this.groupsUsingDefaultStyles[0] % 10;
  this.visible = group.visible === undefined ? true : group.visible;
  this.style = group.style;
  this.setOptions(group.options);
};


//TODO: move these render functions into the type specific files and call them from LineGraph

/**
 * draw the icon for the legend.
 *
 * @param x
 * @param y
 * @param JSONcontainer
 * @param SVGcontainer
 * @param iconWidth
 * @param iconHeight
 */
GraphGroup.prototype.drawIcon = function (x, y, JSONcontainer, SVGcontainer, iconWidth, iconHeight) {
  var fillHeight = iconHeight * 0.5;
  var path, fillPath;

  var outline = DOMutil.getSVGElement("rect", JSONcontainer, SVGcontainer);
  outline.setAttributeNS(null, "x", x);
  outline.setAttributeNS(null, "y", y - fillHeight);
  outline.setAttributeNS(null, "width", iconWidth);
  outline.setAttributeNS(null, "height", 2 * fillHeight);
  outline.setAttributeNS(null, "class", "vis-outline");

  if (this.options.style == 'line') {
    path = DOMutil.getSVGElement("path", JSONcontainer, SVGcontainer);
    path.setAttributeNS(null, "class", this.className);
    if (this.style !== undefined) {
      path.setAttributeNS(null, "style", this.style);
    }

    path.setAttributeNS(null, "d", "M" + x + "," + y + " L" + (x + iconWidth) + "," + y + "");
    if (this.options.shaded.enabled == true) {
      fillPath = DOMutil.getSVGElement("path", JSONcontainer, SVGcontainer);
      if (this.options.shaded.orientation == 'top') {
        fillPath.setAttributeNS(null, "d", "M" + x + ", " + (y - fillHeight) +
          "L" + x + "," + y + " L" + (x + iconWidth) + "," + y + " L" + (x + iconWidth) + "," + (y - fillHeight));
      }
      else {
        fillPath.setAttributeNS(null, "d", "M" + x + "," + y + " " +
          "L" + x + "," + (y + fillHeight) + " " +
          "L" + (x + iconWidth) + "," + (y + fillHeight) +
          "L" + (x + iconWidth) + "," + y);
      }
      fillPath.setAttributeNS(null, "class", this.className + " vis-icon-fill");
      if (this.options.shaded.style !== undefined && this.options.shaded.style !== "") {
        fillPath.setAttributeNS(null, "style", this.options.shaded.style);
      }
    }

    if (this.options.drawPoints.enabled == true) {
      var groupTemplate = {
        style: this.options.drawPoints.style,
        styles: this.options.drawPoints.styles,
        size: this.options.drawPoints.size,
        className: this.className
      };
      DOMutil.drawPoint(x + 0.5 * iconWidth, y, groupTemplate, JSONcontainer, SVGcontainer);
    }
  }
  else {
    var barWidth = Math.round(0.3 * iconWidth);
    var bar1Height = Math.round(0.4 * iconHeight);
    var bar2Height = Math.round(0.75 * iconHeight);

    var offset = Math.round((iconWidth - (2 * barWidth)) / 3);

    DOMutil.drawBar(x + 0.5 * barWidth + offset, y + fillHeight - bar1Height - 1, barWidth, bar1Height, this.className + ' vis-bar', JSONcontainer, SVGcontainer, this.style);
    DOMutil.drawBar(x + 1.5 * barWidth + offset + 2, y + fillHeight - bar2Height - 1, barWidth, bar2Height, this.className + ' vis-bar', JSONcontainer, SVGcontainer, this.style);
  }
};


/**
 * return the legend entree for this group.
 *
 * @param iconWidth
 * @param iconHeight
 * @returns {{icon: HTMLElement, label: (group.content|*|string), orientation: (.options.yAxisOrientation|*)}}
 */
GraphGroup.prototype.getLegend = function (iconWidth, iconHeight) {
  var svg = document.createElementNS('http://www.w3.org/2000/svg', "svg");
  this.drawIcon(0, 0.5 * iconHeight, [], svg, iconWidth, iconHeight);
  return {icon: svg, label: this.content, orientation: this.options.yAxisOrientation};
};

GraphGroup.prototype.getYRange = function (groupData) {
  var yMin = groupData[0].y;
  var yMax = groupData[0].y;
  for (var j = 0; j < groupData.length; j++) {
    yMin = yMin > groupData[j].y ? groupData[j].y : yMin;
    yMax = yMax < groupData[j].y ? groupData[j].y : yMax;
  }
  return {min: yMin, max: yMax, yAxisOrientation: this.options.yAxisOrientation};
};

module.exports = GraphGroup;