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

var echarts = require("../../echarts");

/*
* 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.
*/

/**
 * @file  The file used to draw sankey view
 * @author  Deqing Li(annong035@gmail.com)
 */
var SankeyShape = graphic.extendShape({
  shape: {
    x1: 0,
    y1: 0,
    x2: 0,
    y2: 0,
    cpx1: 0,
    cpy1: 0,
    cpx2: 0,
    cpy2: 0,
    extent: 0
  },
  buildPath: function (ctx, shape) {
    var halfExtent = shape.extent / 2;
    ctx.moveTo(shape.x1, shape.y1 - halfExtent);
    ctx.bezierCurveTo(shape.cpx1, shape.cpy1 - halfExtent, shape.cpx2, shape.cpy2 - halfExtent, shape.x2, shape.y2 - halfExtent);
    ctx.lineTo(shape.x2, shape.y2 + halfExtent);
    ctx.bezierCurveTo(shape.cpx2, shape.cpy2 + halfExtent, shape.cpx1, shape.cpy1 + halfExtent, shape.x1, shape.y1 + halfExtent);
    ctx.closePath();
  }
});

var _default = echarts.extendChartView({
  type: 'sankey',

  /**
   * @private
   * @type {module:echarts/chart/sankey/SankeySeries}
   */
  _model: null,
  render: function (seriesModel, ecModel, api) {
    var graph = seriesModel.getGraph();
    var group = this.group;
    var layoutInfo = seriesModel.layoutInfo; // view width

    var width = layoutInfo.width; // view height

    var height = layoutInfo.height;
    var nodeData = seriesModel.getData();
    var edgeData = seriesModel.getData('edge');
    this._model = seriesModel;
    group.removeAll();
    group.attr('position', [layoutInfo.x, layoutInfo.y]); // generate a bezire Curve for each edge

    graph.eachEdge(function (edge) {
      var curve = new SankeyShape();
      curve.dataIndex = edge.dataIndex;
      curve.seriesIndex = seriesModel.seriesIndex;
      curve.dataType = 'edge';
      var lineStyleModel = edge.getModel('lineStyle');
      var curvature = lineStyleModel.get('curveness');
      var n1Layout = edge.node1.getLayout();
      var node1Model = edge.node1.getModel();
      var dragX1 = node1Model.get('localX');
      var dragY1 = node1Model.get('localY');
      var n2Layout = edge.node2.getLayout();
      var node2Model = edge.node2.getModel();
      var dragX2 = node2Model.get('localX');
      var dragY2 = node2Model.get('localY');
      var edgeLayout = edge.getLayout();
      curve.shape.extent = Math.max(1, edgeLayout.dy);
      var x1 = (dragX1 != null ? dragX1 * width : n1Layout.x) + n1Layout.dx;
      var y1 = (dragY1 != null ? dragY1 * height : n1Layout.y) + edgeLayout.sy + edgeLayout.dy / 2;
      var x2 = dragX2 != null ? dragX2 * width : n2Layout.x;
      var y2 = (dragY2 != null ? dragY2 * height : n2Layout.y) + edgeLayout.ty + edgeLayout.dy / 2;
      var cpx1 = x1 * (1 - curvature) + x2 * curvature;
      var cpy1 = y1;
      var cpx2 = x1 * curvature + x2 * (1 - curvature);
      var cpy2 = y2;
      curve.setShape({
        x1: x1,
        y1: y1,
        x2: x2,
        y2: y2,
        cpx1: cpx1,
        cpy1: cpy1,
        cpx2: cpx2,
        cpy2: cpy2
      });
      curve.setStyle(lineStyleModel.getItemStyle()); // Special color, use source node color or target node color

      switch (curve.style.fill) {
        case 'source':
          curve.style.fill = edge.node1.getVisual('color');
          break;

        case 'target':
          curve.style.fill = edge.node2.getVisual('color');
          break;
      }

      graphic.setHoverStyle(curve, edge.getModel('emphasis.lineStyle').getItemStyle());
      group.add(curve);
      edgeData.setItemGraphicEl(edge.dataIndex, curve);
    }); // generate a rect for each node

    graph.eachNode(function (node) {
      var layout = node.getLayout();
      var itemModel = node.getModel();
      var dragX = itemModel.get('localX');
      var dragY = itemModel.get('localY');
      var labelModel = itemModel.getModel('label');
      var labelHoverModel = itemModel.getModel('emphasis.label');
      var rect = new graphic.Rect({
        shape: {
          x: dragX != null ? dragX * width : layout.x,
          y: dragY != null ? dragY * height : layout.y,
          width: layout.dx,
          height: layout.dy
        },
        style: itemModel.getModel('itemStyle').getItemStyle()
      });
      var hoverStyle = node.getModel('emphasis.itemStyle').getItemStyle();
      graphic.setLabelStyle(rect.style, hoverStyle, labelModel, labelHoverModel, {
        labelFetcher: seriesModel,
        labelDataIndex: node.dataIndex,
        defaultText: node.id,
        isRectText: true
      });
      rect.setStyle('fill', node.getVisual('color'));
      graphic.setHoverStyle(rect, hoverStyle);
      group.add(rect);
      nodeData.setItemGraphicEl(node.dataIndex, rect);
      rect.dataType = 'node';
    });
    var draggable = seriesModel.get('draggable');

    if (draggable) {
      nodeData.eachItemGraphicEl(function (el, dataIndex) {
        el.drift = function (dx, dy) {
          this.shape.x += dx;
          this.shape.y += dy;
          this.dirty();
          api.dispatchAction({
            type: 'dragNode',
            seriesId: seriesModel.id,
            dataIndex: nodeData.getRawIndex(dataIndex),
            localX: this.shape.x / width,
            localY: this.shape.y / height
          });
        };

        el.draggable = true;
        el.cursor = 'move';
      });
    }

    if (!this._data && seriesModel.get('animation')) {
      group.setClipPath(createGridClipShape(group.getBoundingRect(), seriesModel, function () {
        group.removeClipPath();
      }));
    }

    this._data = seriesModel.getData();
  },
  dispose: function () {}
}); // add animation to the view


function createGridClipShape(rect, seriesModel, cb) {
  var rectEl = new graphic.Rect({
    shape: {
      x: rect.x - 10,
      y: rect.y - 10,
      width: 0,
      height: rect.height + 20
    }
  });
  graphic.initProps(rectEl, {
    shape: {
      width: rect.width + 20,
      height: rect.height + 20
    }
  }, seriesModel, cb);
  return rectEl;
}

module.exports = _default;