/* Author: Raphaël Velt, IRI

 * 

 * Licence: CeCILL-B - http://www.cecill.info/licences/Licence_CeCILL-B_V1-fr.html

 * 

 * */

Btv_Podium = function(data, opts) {

    this.options = opts || {};

    this.options.container = this.options.container || 'podium';

    this.options.spacing = this.options.spacing || 20;

    this.options.barBgd = this.options.barBgd || '#ffffff';

    this.options.transitionDuration = this.options.transitionDuration || 200;

    this.$ = this.options.jquery || jQuery;

    this._$ = this.$('#' + this.options.container);

    if (!this._$.length) {

        var _el = document.createElement("div");

        _el.id = this.options.container;

        document.body.appendChild(_el);

        this._$ = this.$(_el);

    }

    this.options.width = this.options.width || this._$.width();

    this.options.height = this.options.height || this._$.height();

    this.options.minHeight = this.options.minHeight || 0;

    this.lastheights = [];

    this.update(data, true);

}

Btv_Podium.prototype.update = function(data, noAnimate) {

    var _data = data || [];

    while (_data.length > this._$.children().length) {

        var _newCol = document.createElement("div");

        this.$(_newCol).css({

            "float": "left",

            "background": this.options.barBgd,

            "width": 0,

            "height": 0,

            "margin-top": this.options.height,

            "margin-left": 0,

        });

        this._$.append(_newCol);

    }

    while (_data.length < this._$.children().length) {

        this._$.children().last().detach();

    }

    if (_data.length) {

        var _max = _data.reduce(function(_memo, _val) {

                return Math.max(_memo, _val);

            }, 1),

            _scale = (this.options.height - this.options.minHeight) / _max,

            _spacing = Math.min(this.options.spacing, Math.floor(.5*this.options.width/_data.length)),

            _width = Math.floor(( this.options.width - (_data.length - 1) * _spacing) / _data.length),

            _this = this,

            _heights = [];

        this._$.children().each(function(_i, _e) {

            var _height = Math.floor(_scale * _data[_i] + _this.options.minHeight),

                _css = {},

                _changed = false;

            _heights.push(_height);

            if (_data.length != _this.lastheights.length) {

                _css["width"] = _width;

                _css["margin-left"] = (_i ? _spacing : 0);

                _changed = true;

            }

            if (_i >= _data.length || _height != _this.lastheights[_i]) {

                _css["height"] = _height;

                _css["margin-top"] = _this.options.height - _height

                _changed = true;

            }

            if (_changed) {

                if (noAnimate) {

                    _this.$(_e).css(_css); 

                } else {

                    _this.$(_e).animate(_css);

                }

            }

        });

        this.lastheights = _heights;

    }

}