/*
* 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.
*/

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

var zrUtil = require("zrender/lib/core/util");

var SymbolDraw = require("../helper/SymbolDraw");

var LineDraw = require("../helper/LineDraw");

var RoamController = require("../../component/helper/RoamController");

var roamHelper = require("../../component/helper/roamHelper");

var _cursorHelper = require("../../component/helper/cursorHelper");

var onIrrelevantElement = _cursorHelper.onIrrelevantElement;

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

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

/*
* 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.
*/
var FOCUS_ADJACENCY = '__focusNodeAdjacency';
var UNFOCUS_ADJACENCY = '__unfocusNodeAdjacency';
var nodeOpacityPath = ['itemStyle', 'opacity'];
var lineOpacityPath = ['lineStyle', 'opacity'];

function getItemOpacity(item, opacityPath) {
  return item.getVisual('opacity') || item.getModel().get(opacityPath);
}

function fadeOutItem(item, opacityPath, opacityRatio) {
  var el = item.getGraphicEl();
  var opacity = getItemOpacity(item, opacityPath);

  if (opacityRatio != null) {
    opacity == null && (opacity = 1);
    opacity *= opacityRatio;
  }

  el.downplay && el.downplay();
  el.traverse(function (child) {
    if (child.type !== 'group') {
      var opct = child.lineLabelOriginalOpacity;

      if (opct == null || opacityRatio != null) {
        opct = opacity;
      }

      child.setStyle('opacity', opct);
    }
  });
}

function fadeInItem(item, opacityPath) {
  var opacity = getItemOpacity(item, opacityPath);
  var el = item.getGraphicEl();
  el.highlight && el.highlight();
  el.traverse(function (child) {
    if (child.type !== 'group') {
      child.setStyle('opacity', opacity);
    }
  });
}

var _default = echarts.extendChartView({
  type: 'graph',
  init: function (ecModel, api) {
    var symbolDraw = new SymbolDraw();
    var lineDraw = new LineDraw();
    var group = this.group;
    this._controller = new RoamController(api.getZr());
    this._controllerHost = {
      target: group
    };
    group.add(symbolDraw.group);
    group.add(lineDraw.group);
    this._symbolDraw = symbolDraw;
    this._lineDraw = lineDraw;
    this._firstRender = true;
  },
  render: function (seriesModel, ecModel, api) {
    var coordSys = seriesModel.coordinateSystem;
    this._model = seriesModel;
    this._nodeScaleRatio = seriesModel.get('nodeScaleRatio');
    var symbolDraw = this._symbolDraw;
    var lineDraw = this._lineDraw;
    var group = this.group;

    if (coordSys.type === 'view') {
      var groupNewProp = {
        position: coordSys.position,
        scale: coordSys.scale
      };

      if (this._firstRender) {
        group.attr(groupNewProp);
      } else {
        graphic.updateProps(group, groupNewProp, seriesModel);
      }
    } // Fix edge contact point with node


    adjustEdge(seriesModel.getGraph(), this._getNodeGlobalScale(seriesModel));
    var data = seriesModel.getData();
    symbolDraw.updateData(data);
    var edgeData = seriesModel.getEdgeData();
    lineDraw.updateData(edgeData);

    this._updateNodeAndLinkScale();

    this._updateController(seriesModel, ecModel, api);

    clearTimeout(this._layoutTimeout);
    var forceLayout = seriesModel.forceLayout;
    var layoutAnimation = seriesModel.get('force.layoutAnimation');

    if (forceLayout) {
      this._startForceLayoutIteration(forceLayout, layoutAnimation);
    }

    data.eachItemGraphicEl(function (el, idx) {
      var itemModel = data.getItemModel(idx); // Update draggable

      el.off('drag').off('dragend');
      var draggable = itemModel.get('draggable');

      if (draggable) {
        el.on('drag', function () {
          if (forceLayout) {
            forceLayout.warmUp();
            !this._layouting && this._startForceLayoutIteration(forceLayout, layoutAnimation);
            forceLayout.setFixed(idx); // Write position back to layout

            data.setItemLayout(idx, el.position);
          }
        }, this).on('dragend', function () {
          if (forceLayout) {
            forceLayout.setUnfixed(idx);
          }
        }, this);
      }

      el.setDraggable(draggable && forceLayout);
      el[FOCUS_ADJACENCY] && el.off('mouseover', el[FOCUS_ADJACENCY]);
      el[UNFOCUS_ADJACENCY] && el.off('mouseout', el[UNFOCUS_ADJACENCY]);

      if (itemModel.get('focusNodeAdjacency')) {
        el.on('mouseover', el[FOCUS_ADJACENCY] = function () {
          api.dispatchAction({
            type: 'focusNodeAdjacency',
            seriesId: seriesModel.id,
            dataIndex: el.dataIndex
          });
        });
        el.on('mouseout', el[UNFOCUS_ADJACENCY] = function () {
          api.dispatchAction({
            type: 'unfocusNodeAdjacency',
            seriesId: seriesModel.id
          });
        });
      }
    }, this);
    data.graph.eachEdge(function (edge) {
      var el = edge.getGraphicEl();
      el[FOCUS_ADJACENCY] && el.off('mouseover', el[FOCUS_ADJACENCY]);
      el[UNFOCUS_ADJACENCY] && el.off('mouseout', el[UNFOCUS_ADJACENCY]);

      if (edge.getModel().get('focusNodeAdjacency')) {
        el.on('mouseover', el[FOCUS_ADJACENCY] = function () {
          api.dispatchAction({
            type: 'focusNodeAdjacency',
            seriesId: seriesModel.id,
            edgeDataIndex: edge.dataIndex
          });
        });
        el.on('mouseout', el[UNFOCUS_ADJACENCY] = function () {
          api.dispatchAction({
            type: 'unfocusNodeAdjacency',
            seriesId: seriesModel.id
          });
        });
      }
    });
    var circularRotateLabel = seriesModel.get('layout') === 'circular' && seriesModel.get('circular.rotateLabel');
    var cx = data.getLayout('cx');
    var cy = data.getLayout('cy');
    data.eachItemGraphicEl(function (el, idx) {
      var symbolPath = el.getSymbolPath();

      if (circularRotateLabel) {
        var pos = data.getItemLayout(idx);
        var rad = Math.atan2(pos[1] - cy, pos[0] - cx);

        if (rad < 0) {
          rad = Math.PI * 2 + rad;
        }

        var isLeft = pos[0] < cx;

        if (isLeft) {
          rad = rad - Math.PI;
        }

        var textPosition = isLeft ? 'left' : 'right';
        symbolPath.setStyle({
          textRotation: -rad,
          textPosition: textPosition,
          textOrigin: 'center'
        });
        symbolPath.hoverStyle && (symbolPath.hoverStyle.textPosition = textPosition);
      } else {
        symbolPath.setStyle({
          textRotation: 0
        });
      }
    });
    this._firstRender = false;
  },
  dispose: function () {
    this._controller && this._controller.dispose();
    this._controllerHost = {};
  },
  focusNodeAdjacency: function (seriesModel, ecModel, api, payload) {
    var data = this._model.getData();

    var graph = data.graph;
    var dataIndex = payload.dataIndex;
    var edgeDataIndex = payload.edgeDataIndex;
    var node = graph.getNodeByIndex(dataIndex);
    var edge = graph.getEdgeByIndex(edgeDataIndex);

    if (!node && !edge) {
      return;
    }

    graph.eachNode(function (node) {
      fadeOutItem(node, nodeOpacityPath, 0.1);
    });
    graph.eachEdge(function (edge) {
      fadeOutItem(edge, lineOpacityPath, 0.1);
    });

    if (node) {
      fadeInItem(node, nodeOpacityPath);
      zrUtil.each(node.edges, function (adjacentEdge) {
        if (adjacentEdge.dataIndex < 0) {
          return;
        }

        fadeInItem(adjacentEdge, lineOpacityPath);
        fadeInItem(adjacentEdge.node1, nodeOpacityPath);
        fadeInItem(adjacentEdge.node2, nodeOpacityPath);
      });
    }

    if (edge) {
      fadeInItem(edge, lineOpacityPath);
      fadeInItem(edge.node1, nodeOpacityPath);
      fadeInItem(edge.node2, nodeOpacityPath);
    }
  },
  unfocusNodeAdjacency: function (seriesModel, ecModel, api, payload) {
    var graph = this._model.getData().graph;

    graph.eachNode(function (node) {
      fadeOutItem(node, nodeOpacityPath);
    });
    graph.eachEdge(function (edge) {
      fadeOutItem(edge, lineOpacityPath);
    });
  },
  _startForceLayoutIteration: function (forceLayout, layoutAnimation) {
    var self = this;

    (function step() {
      forceLayout.step(function (stopped) {
        self.updateLayout(self._model);
        (self._layouting = !stopped) && (layoutAnimation ? self._layoutTimeout = setTimeout(step, 16) : step());
      });
    })();
  },
  _updateController: function (seriesModel, ecModel, api) {
    var controller = this._controller;
    var controllerHost = this._controllerHost;
    var group = this.group;
    controller.setPointerChecker(function (e, x, y) {
      var rect = group.getBoundingRect();
      rect.applyTransform(group.transform);
      return rect.contain(x, y) && !onIrrelevantElement(e, api, seriesModel);
    });

    if (seriesModel.coordinateSystem.type !== 'view') {
      controller.disable();
      return;
    }

    controller.enable(seriesModel.get('roam'));
    controllerHost.zoomLimit = seriesModel.get('scaleLimit');
    controllerHost.zoom = seriesModel.coordinateSystem.getZoom();
    controller.off('pan').off('zoom').on('pan', function (e) {
      roamHelper.updateViewOnPan(controllerHost, e.dx, e.dy);
      api.dispatchAction({
        seriesId: seriesModel.id,
        type: 'graphRoam',
        dx: e.dx,
        dy: e.dy
      });
    }).on('zoom', function (e) {
      roamHelper.updateViewOnZoom(controllerHost, e.scale, e.originX, e.originY);
      api.dispatchAction({
        seriesId: seriesModel.id,
        type: 'graphRoam',
        zoom: e.scale,
        originX: e.originX,
        originY: e.originY
      });

      this._updateNodeAndLinkScale();

      adjustEdge(seriesModel.getGraph(), this._getNodeGlobalScale(seriesModel));

      this._lineDraw.updateLayout();
    }, this);
  },
  _updateNodeAndLinkScale: function () {
    var seriesModel = this._model;
    var data = seriesModel.getData();

    var nodeScale = this._getNodeGlobalScale(seriesModel);

    var invScale = [nodeScale, nodeScale];
    data.eachItemGraphicEl(function (el, idx) {
      el.attr('scale', invScale);
    });
  },
  _getNodeGlobalScale: function (seriesModel) {
    var coordSys = seriesModel.coordinateSystem;

    if (coordSys.type !== 'view') {
      return 1;
    }

    var nodeScaleRatio = this._nodeScaleRatio;
    var groupScale = coordSys.scale;
    var groupZoom = groupScale && groupScale[0] || 1; // Scale node when zoom changes

    var roamZoom = coordSys.getZoom();
    var nodeScale = (roamZoom - 1) * nodeScaleRatio + 1;
    return nodeScale / groupZoom;
  },
  updateLayout: function (seriesModel) {
    adjustEdge(seriesModel.getGraph(), this._getNodeGlobalScale(seriesModel));

    this._symbolDraw.updateLayout();

    this._lineDraw.updateLayout();
  },
  remove: function (ecModel, api) {
    this._symbolDraw && this._symbolDraw.remove();
    this._lineDraw && this._lineDraw.remove();
  }
});

module.exports = _default;