/* global Matrix, buildShapeString, bmFloor */
/* exported SVGElementsRenderer */

var SVGElementsRenderer = (function () {
  var _identityMatrix = new Matrix();
  var _matrixHelper = new Matrix();

  var ob = {
    createRenderFunction: createRenderFunction,
  };

  function createRenderFunction(data) {
    switch (data.ty) {
      case 'fl':
        return renderFill;
      case 'gf':
        return renderGradient;
      case 'gs':
        return renderGradientStroke;
      case 'st':
        return renderStroke;
      case 'sh':
      case 'el':
      case 'rc':
      case 'sr':
        return renderPath;
      case 'tr':
        return renderContentTransform;
      default:
        return null;
    }
  }

  function renderContentTransform(styleData, itemData, isFirstFrame) {
    if (isFirstFrame || itemData.transform.op._mdf) {
      itemData.transform.container.setAttribute('opacity', itemData.transform.op.v);
    }
    if (isFirstFrame || itemData.transform.mProps._mdf) {
      itemData.transform.container.setAttribute('transform', itemData.transform.mProps.v.to2dCSS());
    }
  }

  function renderPath(styleData, itemData, isFirstFrame) {
    var j;
    var jLen;
    var pathStringTransformed;
    var redraw;
    var pathNodes;
    var l;
    var lLen = itemData.styles.length;
    var lvl = itemData.lvl;
    var paths;
    var mat;
    var props;
    var iterations;
    var k;
    for (l = 0; l < lLen; l += 1) {
      redraw = itemData.sh._mdf || isFirstFrame;
      if (itemData.styles[l].lvl < lvl) {
        mat = _matrixHelper.reset();
        iterations = lvl - itemData.styles[l].lvl;
        k = itemData.transformers.length - 1;
        while (!redraw && iterations > 0) {
          redraw = itemData.transformers[k].mProps._mdf || redraw;
          iterations -= 1;
          k -= 1;
        }
        if (redraw) {
          iterations = lvl - itemData.styles[l].lvl;
          k = itemData.transformers.length - 1;
          while (iterations > 0) {
            props = itemData.transformers[k].mProps.v.props;
            mat.transform(props[0], props[1], props[2], props[3], props[4], props[5], props[6], props[7], props[8], props[9], props[10], props[11], props[12], props[13], props[14], props[15]);
            iterations -= 1;
            k -= 1;
          }
        }
      } else {
        mat = _identityMatrix;
      }
      paths = itemData.sh.paths;
      jLen = paths._length;
      if (redraw) {
        pathStringTransformed = '';
        for (j = 0; j < jLen; j += 1) {
          pathNodes = paths.shapes[j];
          if (pathNodes && pathNodes._length) {
            pathStringTransformed += buildShapeString(pathNodes, pathNodes._length, pathNodes.c, mat);
          }
        }
        itemData.caches[l] = pathStringTransformed;
      } else {
        pathStringTransformed = itemData.caches[l];
      }
      itemData.styles[l].d += styleData.hd === true ? '' : pathStringTransformed;
      itemData.styles[l]._mdf = redraw || itemData.styles[l]._mdf;
    }
  }

  function renderFill(styleData, itemData, isFirstFrame) {
    var styleElem = itemData.style;

    if (itemData.c._mdf || isFirstFrame) {
      styleElem.pElem.setAttribute('fill', 'rgb(' + bmFloor(itemData.c.v[0]) + ',' + bmFloor(itemData.c.v[1]) + ',' + bmFloor(itemData.c.v[2]) + ')');
    }
    if (itemData.o._mdf || isFirstFrame) {
      styleElem.pElem.setAttribute('fill-opacity', itemData.o.v);
    }
  }

  function renderGradientStroke(styleData, itemData, isFirstFrame) {
    renderGradient(styleData, itemData, isFirstFrame);
    renderStroke(styleData, itemData, isFirstFrame);
  }

  function renderGradient(styleData, itemData, isFirstFrame) {
    var gfill = itemData.gf;
    var hasOpacity = itemData.g._hasOpacity;
    var pt1 = itemData.s.v;
    var pt2 = itemData.e.v;

    if (itemData.o._mdf || isFirstFrame) {
      var attr = styleData.ty === 'gf' ? 'fill-opacity' : 'stroke-opacity';
      itemData.style.pElem.setAttribute(attr, itemData.o.v);
    }
    if (itemData.s._mdf || isFirstFrame) {
      var attr1 = styleData.t === 1 ? 'x1' : 'cx';
      var attr2 = attr1 === 'x1' ? 'y1' : 'cy';
      gfill.setAttribute(attr1, pt1[0]);
      gfill.setAttribute(attr2, pt1[1]);
      if (hasOpacity && !itemData.g._collapsable) {
        itemData.of.setAttribute(attr1, pt1[0]);
        itemData.of.setAttribute(attr2, pt1[1]);
      }
    }
    var stops;
    var i;
    var len;
    var stop;
    if (itemData.g._cmdf || isFirstFrame) {
      stops = itemData.cst;
      var cValues = itemData.g.c;
      len = stops.length;
      for (i = 0; i < len; i += 1) {
        stop = stops[i];
        stop.setAttribute('offset', cValues[i * 4] + '%');
        stop.setAttribute('stop-color', 'rgb(' + cValues[i * 4 + 1] + ',' + cValues[i * 4 + 2] + ',' + cValues[i * 4 + 3] + ')');
      }
    }
    if (hasOpacity && (itemData.g._omdf || isFirstFrame)) {
      var oValues = itemData.g.o;
      if (itemData.g._collapsable) {
        stops = itemData.cst;
      } else {
        stops = itemData.ost;
      }
      len = stops.length;
      for (i = 0; i < len; i += 1) {
        stop = stops[i];
        if (!itemData.g._collapsable) {
          stop.setAttribute('offset', oValues[i * 2] + '%');
        }
        stop.setAttribute('stop-opacity', oValues[i * 2 + 1]);
      }
    }
    if (styleData.t === 1) {
      if (itemData.e._mdf || isFirstFrame) {
        gfill.setAttribute('x2', pt2[0]);
        gfill.setAttribute('y2', pt2[1]);
        if (hasOpacity && !itemData.g._collapsable) {
          itemData.of.setAttribute('x2', pt2[0]);
          itemData.of.setAttribute('y2', pt2[1]);
        }
      }
    } else {
      var rad;
      if (itemData.s._mdf || itemData.e._mdf || isFirstFrame) {
        rad = Math.sqrt(Math.pow(pt1[0] - pt2[0], 2) + Math.pow(pt1[1] - pt2[1], 2));
        gfill.setAttribute('r', rad);
        if (hasOpacity && !itemData.g._collapsable) {
          itemData.of.setAttribute('r', rad);
        }
      }
      if (itemData.e._mdf || itemData.h._mdf || itemData.a._mdf || isFirstFrame) {
        if (!rad) {
          rad = Math.sqrt(Math.pow(pt1[0] - pt2[0], 2) + Math.pow(pt1[1] - pt2[1], 2));
        }
        var ang = Math.atan2(pt2[1] - pt1[1], pt2[0] - pt1[0]);

        var percent = itemData.h.v;
        if (percent >= 1) {
          percent = 0.99;
        } else if (percent <= -1) {
          percent = -0.99;
        }
        var dist = rad * percent;
        var x = Math.cos(ang + itemData.a.v) * dist + pt1[0];
        var y = Math.sin(ang + itemData.a.v) * dist + pt1[1];
        gfill.setAttribute('fx', x);
        gfill.setAttribute('fy', y);
        if (hasOpacity && !itemData.g._collapsable) {
          itemData.of.setAttribute('fx', x);
          itemData.of.setAttribute('fy', y);
        }
      }
      // gfill.setAttribute('fy','200');
    }
  }

  function renderStroke(styleData, itemData, isFirstFrame) {
    var styleElem = itemData.style;
    var d = itemData.d;
    if (d && (d._mdf || isFirstFrame) && d.dashStr) {
      styleElem.pElem.setAttribute('stroke-dasharray', d.dashStr);
      styleElem.pElem.setAttribute('stroke-dashoffset', d.dashoffset[0]);
    }
    if (itemData.c && (itemData.c._mdf || isFirstFrame)) {
      styleElem.pElem.setAttribute('stroke', 'rgb(' + bmFloor(itemData.c.v[0]) + ',' + bmFloor(itemData.c.v[1]) + ',' + bmFloor(itemData.c.v[2]) + ')');
    }
    if (itemData.o._mdf || isFirstFrame) {
      styleElem.pElem.setAttribute('stroke-opacity', itemData.o.v);
    }
    if (itemData.w._mdf || isFirstFrame) {
      styleElem.pElem.setAttribute('stroke-width', itemData.w.v);
      if (styleElem.msElem) {
        styleElem.msElem.setAttribute('stroke-width', itemData.w.v);
      }
    }
  }

  return ob;
}());