/**
  * Donut Chart
  * --------------------------------------------------
  */

;(function(window, document, undefined) {

  'use strict';

  var DonutChart = DonutChart || {

    /**
      * Initialize Chart
      */

    init: function(options) {

      this.settings(options);
      this.createChartStructre();
      this.setChartMeta();
      this.build();

    }, // init()

    /**
      * Update Chart
      */

    update: function(options) {

      this.settings(options);
      this.setChartMeta();
      this.build();

    }, // update()

    /**
      * Chart Settings
      */

    settings: function(options) {

      this.config = {
        container: options.container ? options.container : this.config.container,
        data: options.data ? options.data : this.config.data,
        label: options.label ? options.label : 'Total',
        offset: options.offset ? options.offset : 0
      };

    }, // settings()

    /**
      * Build chart
      */

    build: function() {

      var container = this.config.container.querySelector('.outer-circle');
      var wedges = container.querySelectorAll('[data-wedge-id]');
      var wedgesIdArray = [];

      for (var i = 0; i < wedges.length; i++) {
        wedgesIdArray.push(wedges[i].dataset.wedgeId);
      }

      for (var j = 0; j < this.config.data.wedges.length; j++) {
        if (wedgesIdArray.indexOf(this.config.data.wedges[j].id) == -1) {
          var wedge = this.createWedge(this.config.data.wedges[j]);
          container.appendChild(wedge);
        }
        this.setWedge(this.config.data.wedges[j]);
      }

    }, // createWedges()

    /**
      * Create chart structure
      */

    createChartStructre: function() {

      var outer = document.createElement('div');
      var inner = document.createElement('div');
      var label = document.createElement('span');
      var value = document.createElement('span');

      outer.className = 'outer-circle';
      inner.className = 'inner-circle';
      label.className = 'inner-circle-label';
      value.className = 'inner-circle-value';

      this.config.container.appendChild(outer);
      this.config.container.appendChild(inner);
      inner.appendChild(label);
      inner.appendChild(value);

    }, // createChartStructre()

    /**
      * Set chart meta
      */

    setChartMeta: function() {

      var label = this.config.container.querySelector('.inner-circle-label');
      var value = this.config.container.querySelector('.inner-circle-value');

      label.innerHTML = this.config.label;
      value.innerHTML = this.config.data.total;

    }, // setChartMeta()

    /**
      * Create wedge
      */

    createWedge: function(data) {

      var container = document.createElement('div');
      var wedge = document.createElement('div');
      var extension = document.createElement('div');
      var label = document.createElement('div');
      var value = document.createElement('span');

      container.setAttribute('data-wedge-id', data.id);

      container.className = 'wedge-container';
      wedge.className = 'wedge';
      extension.className = 'wedge-extension';
      label.className = 'wedge-label';
      value.className = 'wedge-value';

      container.appendChild(wedge);
      container.appendChild(extension);
      container.appendChild(label);
      label.appendChild(value);

      return container;

    }, // createWedge()

    /**
      * Set wedge
      */

    setWedge: function(data) {

      var container = this.config.container.querySelector('[data-wedge-id="' + data.id + '"]');
      var wedge = container.querySelector('.wedge');
      var extension = container.querySelector('.wedge-extension');
      var label = container.querySelector('.wedge-label');
      var value = container.querySelector('.wedge-value');

      var wedgeDegrees = (360 * data.value) / this.config.data.total;
      var labelDegrees = wedgeDegrees / 2;
      var w = container.offsetWidth;

      container.style.transform = 'rotate(' + this.config.offset + 'deg)';
      container.style.webkitTransform = 'rotate(' + this.config.offset + 'deg)';
      container.style.clip = wedgeDegrees > 180 ? 'auto' : 'rect(0, ' + w + 'px, ' + w +'px, ' + (w / 2) + 'px)';

      wedge.style.transform = 'rotate(' + wedgeDegrees + 'deg)';
      wedge.style.webkitTransform = 'rotate(' + wedgeDegrees + 'deg)';
      wedge.style.backgroundColor = this.color(data.color, 5);
      wedge.style.clip = 'rect(0, ' + (w / 2) + 'px, ' + w +'px, 0)';

      if (wedgeDegrees > 180) {
        extension.style.opacity = 1;
        extension.style.transform = 'rotate(' + 180 + 'deg)';
        extension.style.webkitTransform = 'rotate(' + 180 + 'deg)';
        extension.style.backgroundColor = this.color(data.color, 5);
        extension.style.clip = 'rect(0, ' + (w / 2) + 'px, ' + w +'px, 0)';
      } else {
        extension.style.opacity = 0;
      }

      label.style.transform = 'rotate(' + labelDegrees + 'deg)';
      label.style.webkitTransform = 'rotate(' + labelDegrees + 'deg)';
      label.style.color = this.color(data.color, -30);

      value.innerHTML = data.value;

      this.config.offset += wedgeDegrees;

    }, // setWedge()

    /**
      * Color Utility
      */

    color: function( color, percent ) {

      var num = parseInt(color.slice(1), 16);
      var amt = Math.round(2.55 * percent);
      var R = (num >> 16) + amt;
      var B = (num >> 8 & 0x00FF) + amt;
      var G = (num & 0x0000FF) + amt;

      return "#" + (0x1000000 + (R < 255 ? R < 1 ? 0 : R : 255) * 0x10000 + (B < 255 ? B < 1 ? 0 : B : 255) * 0x100 + (G < 255 ? G < 1 ? 0 : G : 255)).toString(16).slice(1);

    } // color()

  }; // DonutChart

  window.DonutChart = DonutChart;

})(window, document);