var util = require('../../../util');

var Label = require('./shared/Label').default;
var ComponentUtil = require('./shared/ComponentUtil').default;
var Box = require('./nodes/shapes/Box').default;
var Circle = require('./nodes/shapes/Circle').default;
var CircularImage = require('./nodes/shapes/CircularImage').default;
var Database = require('./nodes/shapes/Database').default;
var Diamond = require('./nodes/shapes/Diamond').default;
var Dot = require('./nodes/shapes/Dot').default;
var Ellipse = require('./nodes/shapes/Ellipse').default;
var Icon = require('./nodes/shapes/Icon').default;
var Image = require('./nodes/shapes/Image').default;
var Square = require('./nodes/shapes/Square').default;
var Hexagon = require('./nodes/shapes/Hexagon').default;
var Star = require('./nodes/shapes/Star').default;
var Text = require('./nodes/shapes/Text').default;
var Triangle = require('./nodes/shapes/Triangle').default;
var TriangleDown = require('./nodes/shapes/TriangleDown').default;
var { printStyle } = require("../../../shared/Validator");


/**
 * A node. A node can be connected to other nodes via one or multiple edges.
 */
class Node {
  /**
   *
   * @param {object} options An object containing options for the node. All
   *                            options are optional, except for the id.
   *                              {number} id     Id of the node. Required
   *                              {string} label  Text label for the node
   *                              {number} x      Horizontal position of the node
   *                              {number} y      Vertical position of the node
   *                              {string} shape  Node shape
   *                              {string} image  An image url
   *                              {string} title  A title text, can be HTML
   *                              {anytype} group A group name or number
   *
   * @param {Object} body               Shared state of current network instance
   * @param {Network.Images} imagelist  A list with images. Only needed when the node has an image
   * @param {Groups} grouplist          A list with groups. Needed for retrieving group options
   * @param {Object} globalOptions      Current global node options; these serve as defaults for the node instance
   * @param {Object} defaultOptions     Global default options for nodes; note that this is also the prototype
   *                                    for parameter `globalOptions`.
   */
  constructor(options, body, imagelist, grouplist, globalOptions, defaultOptions) {
    this.options = util.bridgeObject(globalOptions);
    this.globalOptions = globalOptions;
    this.defaultOptions = defaultOptions;
    this.body = body;

    this.edges = []; // all edges connected to this node

    // set defaults for the options
    this.id = undefined;
    this.imagelist = imagelist;
    this.grouplist = grouplist;

    // state options
    this.x = undefined;
    this.y = undefined;
    this.baseSize = this.options.size;
    this.baseFontSize = this.options.font.size;
    this.predefinedPosition = false; // used to check if initial fit should just take the range or approximate
    this.selected = false;
    this.hover = false;

    this.labelModule = new Label(this.body, this.options, false /* Not edge label */);
    this.setOptions(options);
  }


  /**
   * Attach a edge to the node
   * @param {Edge} edge
   */
  attachEdge(edge) {
    if (this.edges.indexOf(edge) === -1) {
      this.edges.push(edge);
    }
  }


  /**
   * Detach a edge from the node
   *
   * @param {Edge} edge
   */
  detachEdge(edge) {
    var index = this.edges.indexOf(edge);
    if (index != -1) {
      this.edges.splice(index, 1);
    }
  }


  /**
   * Set or overwrite options for the node
   *
   * @param {Object} options an object with options
   * @returns {null|boolean}
   */
  setOptions(options) {
    let currentShape = this.options.shape;
    if (!options) {
      return;  // Note that the return value will be 'undefined'! This is OK.
    }

    // basic options
    if (options.id !== undefined)    {this.id = options.id;}

    if (this.id === undefined) {
      throw new Error("Node must have an id");
    }

    Node.checkMass(options, this.id);

    // set these options locally
    // clear x and y positions
    if (options.x !== undefined) {
      if (options.x === null) {this.x = undefined; this.predefinedPosition = false;}
      else                    {this.x = parseInt(options.x); this.predefinedPosition = true;}
    }
    if (options.y !== undefined) {
      if (options.y === null) {this.y = undefined; this.predefinedPosition = false;}
      else                    {this.y = parseInt(options.y); this.predefinedPosition = true;}
    }
    if (options.size !== undefined)  {this.baseSize = options.size;}
    if (options.value !== undefined) {options.value = parseFloat(options.value);}

    // this transforms all shorthands into fully defined options
    Node.parseOptions(this.options, options, true, this.globalOptions, this.grouplist);

    let pile = [options, this.options, this.defaultOptions];
    this.chooser = ComponentUtil.choosify('node', pile);

    this._load_images();
    this.updateLabelModule(options);
    this.updateShape(currentShape);

    return (options.hidden !== undefined || options.physics !== undefined);
  }


  /**
   * Load the images from the options, for the nodes that need them.
   *
   * Images are always loaded, even if they are not used in the current shape.
   * The user may switch to an image shape later on.
   *
   * @private
   */
  _load_images() {
    if (this.options.shape === 'circularImage' || this.options.shape === 'image') {
      if (this.options.image === undefined) {
        throw new Error("Option image must be defined for node type '" + this.options.shape + "'");
      }
    }

    if (this.options.image === undefined) {
      return;
    }

    if (this.imagelist === undefined) {
      throw new Error("Internal Error: No images provided");
    }

    if (typeof this.options.image === 'string') {
      this.imageObj = this.imagelist.load(this.options.image, this.options.brokenImage, this.id);
    } else {
      if (this.options.image.unselected === undefined) {
        throw new Error("No unselected image provided");
      }

      this.imageObj = this.imagelist.load(this.options.image.unselected, this.options.brokenImage, this.id);

      if (this.options.image.selected !== undefined) {
        this.imageObjAlt = this.imagelist.load(this.options.image.selected, this.options.brokenImage, this.id);
      } else {
        this.imageObjAlt = undefined;
      }
    }
  }


  /**
   * Copy group option values into the node options.
   *
   * The group options override the global node options, so the copy of group options
   *  must happen *after* the global node options have been set.
   *
   * This method must also be called also if the global node options have changed and the group options did not.
   *
   * @param {Object} parentOptions
   * @param {Object} newOptions  new values for the options, currently only passed in for check
   * @param {Object} groupList
   */
  static updateGroupOptions(parentOptions, newOptions, groupList) {
    if (groupList === undefined) return;  // No groups, nothing to do

    var group = parentOptions.group;

    // paranoia: the selected group is already merged into node options, check.
    if (newOptions !== undefined && newOptions.group !== undefined && group !== newOptions.group) {
      throw new Error("updateGroupOptions: group values in options don't match.");
    }

    var hasGroup = (typeof group === 'number' || (typeof group === 'string' && group != ''));
    if (!hasGroup) return;  // current node has no group, no need to merge

    var groupObj = groupList.get(group);

    // Skip merging of group font options into parent; these are required to be distinct for labels
    // Also skip mergin of color IF it is already defined in the node itself. This is to avoid the color of the
    // group overriding the color set at the node level
    // TODO: It might not be a good idea either to merge the rest of the options, investigate this.
    var skipProperties = ['font'];
    if (newOptions !== undefined && newOptions.color !== undefined && newOptions.color != null) skipProperties.push('color');
    util.selectiveNotDeepExtend(skipProperties, parentOptions, groupObj);

    // the color object needs to be completely defined.
    // Since groups can partially overwrite the colors, we parse it again, just in case.
    parentOptions.color = util.parseColor(parentOptions.color);
  }


  /**
   * This process all possible shorthands in the new options and makes sure that the parentOptions are fully defined.
   * Static so it can also be used by the handler.
   *
   * @param {Object} parentOptions
   * @param {Object} newOptions
   * @param {boolean} [allowDeletion=false]
   * @param {Object} [globalOptions={}]
   * @param {Object} [groupList]
   * @static
   */
  static parseOptions(parentOptions, newOptions, allowDeletion = false, globalOptions = {}, groupList) {

    var fields = [
      'color',
      'fixed',
      'shadow'
    ];
    util.selectiveNotDeepExtend(fields, parentOptions, newOptions, allowDeletion);

    Node.checkMass(newOptions);

    // merge the shadow options into the parent.
    util.mergeOptions(parentOptions, newOptions, 'shadow', globalOptions);

    // individual shape newOptions
    if (newOptions.color !== undefined && newOptions.color !== null) {
      let parsedColor = util.parseColor(newOptions.color);
      util.fillIfDefined(parentOptions.color, parsedColor);
    }
    else if (allowDeletion === true && newOptions.color === null) {
      parentOptions.color = util.bridgeObject(globalOptions.color); // set the object back to the global options
    }

    // handle the fixed options
    if (newOptions.fixed !== undefined && newOptions.fixed !== null) {
      if (typeof newOptions.fixed === 'boolean') {
        parentOptions.fixed.x = newOptions.fixed;
        parentOptions.fixed.y = newOptions.fixed;
      }
      else {
        if (newOptions.fixed.x !== undefined && typeof newOptions.fixed.x === 'boolean') {
          parentOptions.fixed.x = newOptions.fixed.x;
        }
        if (newOptions.fixed.y !== undefined && typeof newOptions.fixed.y === 'boolean') {
          parentOptions.fixed.y = newOptions.fixed.y;
        }
      }
    }

    if (allowDeletion === true && newOptions.font === null) {
      parentOptions.font =  util.bridgeObject(globalOptions.font); // set the object back to the global options
    }

    Node.updateGroupOptions(parentOptions, newOptions, groupList);

    // handle the scaling options, specifically the label part
    if (newOptions.scaling !== undefined) {
      util.mergeOptions(parentOptions.scaling, newOptions.scaling, 'label', globalOptions.scaling);
    }
  }


  /**
   *
   * @returns {{color: *, borderWidth: *, borderColor: *, size: *, borderDashes: (boolean|Array|allOptions.nodes.shapeProperties.borderDashes|{boolean, array}), borderRadius: (number|allOptions.nodes.shapeProperties.borderRadius|{number}|Array), shadow: *, shadowColor: *, shadowSize: *, shadowX: *, shadowY: *}}
   */
  getFormattingValues() {
    let values = {
      color: this.options.color.background,
      borderWidth: this.options.borderWidth,
      borderColor: this.options.color.border,
      size: this.options.size,
      borderDashes: this.options.shapeProperties.borderDashes,
      borderRadius: this.options.shapeProperties.borderRadius,
      shadow: this.options.shadow.enabled,
      shadowColor: this.options.shadow.color,
      shadowSize: this.options.shadow.size,
      shadowX: this.options.shadow.x,
      shadowY: this.options.shadow.y
    };
    if (this.selected || this.hover) {
      if (this.chooser === true) {
        if (this.selected) {
          values.borderWidth *= 2;
          values.color = this.options.color.highlight.background;
          values.borderColor = this.options.color.highlight.border;
          values.shadow = this.options.shadow.enabled;
        } else if (this.hover) {
          values.color = this.options.color.hover.background;
          values.borderColor = this.options.color.hover.border;
          values.shadow = this.options.shadow.enabled;
        }
      } else if (typeof this.chooser === 'function') {
        this.chooser(values, this.options.id, this.selected, this.hover);
        if (values.shadow === false) {
          if ((values.shadowColor !== this.options.shadow.color) ||
              (values.shadowSize !== this.options.shadow.size) ||
              (values.shadowX !== this.options.shadow.x) ||
              (values.shadowY !== this.options.shadow.y)) {
            values.shadow = true;
          }
        }
      }
    } else {
      values.shadow = this.options.shadow.enabled;
    }
    return values;
  }


  /**
   *
   * @param {Object} options
   */
  updateLabelModule(options) {
    if (this.options.label === undefined || this.options.label === null) {
      this.options.label = '';
    }

    Node.updateGroupOptions(this.options, options, this.grouplist);

    //
    // Note:The prototype chain for this.options is:
    //
    // this.options ->    NodesHandler.options    -> NodesHandler.defaultOptions
    //                 (also: this.globalOptions)
    //
    // Note that the prototypes are mentioned explicitly in the pile list below;
    // WE DON'T WANT THE ORDER OF THE PROTOTYPES!!!! At least, not for font handling of labels.
    // This is a good indication that the prototype usage of options is deficient.
    //
    var currentGroup = this.grouplist.get(this.options.group, false);
    let pile = [
      options,             // new options
      this.options,        // current node options, see comment above for prototype
      currentGroup,        // group options, if any
      this.globalOptions,  // Currently set global node options
      this.defaultOptions  // Default global node options
    ];
    this.labelModule.update(this.options, pile);

    if (this.labelModule.baseSize !== undefined) {
      this.baseFontSize = this.labelModule.baseSize;
    }
  }


  /**
   *
   * @param {string} currentShape
   */
  updateShape(currentShape) {
    if (currentShape === this.options.shape && this.shape) {
      this.shape.setOptions(this.options, this.imageObj, this.imageObjAlt);
    }
    else {
      // choose draw method depending on the shape
      switch (this.options.shape) {
        case 'box':
          this.shape = new Box(this.options, this.body, this.labelModule);
          break;
        case 'circle':
          this.shape = new Circle(this.options, this.body, this.labelModule);
          break;
        case 'circularImage':
          this.shape = new CircularImage(this.options, this.body, this.labelModule, this.imageObj, this.imageObjAlt);
          break;
        case 'database':
          this.shape = new Database(this.options, this.body, this.labelModule);
          break;
        case 'diamond':
          this.shape = new Diamond(this.options, this.body, this.labelModule);
          break;
        case 'dot':
          this.shape = new Dot(this.options, this.body, this.labelModule);
          break;
        case 'ellipse':
          this.shape = new Ellipse(this.options, this.body, this.labelModule);
          break;
        case 'icon':
          this.shape = new Icon(this.options, this.body, this.labelModule);
          break;
        case 'image':
          this.shape = new Image(this.options, this.body, this.labelModule, this.imageObj, this.imageObjAlt);
          break;
        case 'square':
          this.shape = new Square(this.options, this.body, this.labelModule);
          break;
        case 'hexagon':
          this.shape = new Hexagon(this.options, this.body, this.labelModule);
          break;
        case 'star':
          this.shape = new Star(this.options, this.body, this.labelModule);
          break;
        case 'text':
          this.shape = new Text(this.options, this.body, this.labelModule);
          break;
        case 'triangle':
          this.shape = new Triangle(this.options, this.body, this.labelModule);
          break;
        case 'triangleDown':
          this.shape = new TriangleDown(this.options, this.body, this.labelModule);
          break;
        default:
          this.shape = new Ellipse(this.options, this.body, this.labelModule);
          break;
      }
    }
    this.needsRefresh();
  }


  /**
   * select this node
   */
  select() {
    this.selected = true;
    this.needsRefresh();
  }


  /**
   * unselect this node
   */
  unselect() {
    this.selected = false;
    this.needsRefresh();
  }



  /**
   * Reset the calculated size of the node, forces it to recalculate its size
   */
  needsRefresh() {
    this.shape.refreshNeeded = true;
  }


  /**
   * get the title of this node.
   * @return {string} title    The title of the node, or undefined when no title
   *                           has been set.
   */
  getTitle() {
    return this.options.title;
  }


  /**
   * Calculate the distance to the border of the Node
   * @param {CanvasRenderingContext2D}   ctx
   * @param {number} angle        Angle in radians
   * @returns {number} distance   Distance to the border in pixels
   */
  distanceToBorder(ctx, angle) {
    return this.shape.distanceToBorder(ctx,angle);
  }


  /**
   * Check if this node has a fixed x and y position
   * @return {boolean}      true if fixed, false if not
   */
  isFixed() {
    return (this.options.fixed.x && this.options.fixed.y);
  }


  /**
   * check if this node is selecte
   * @return {boolean} selected   True if node is selected, else false
   */
  isSelected() {
    return this.selected;
  }


  /**
   * Retrieve the value of the node. Can be undefined
   * @return {number} value
   */
  getValue() {
    return this.options.value;
  }


  /**
   * Get the current dimensions of the label
   *
   * @return {rect}
   */
  getLabelSize() {
    return this.labelModule.size();
  }


  /**
   * Adjust the value range of the node. The node will adjust it's size
   * based on its value.
   * @param {number} min
   * @param {number} max
   * @param {number} total
   */
  setValueRange(min, max, total) {
    if (this.options.value !== undefined) {
      var scale = this.options.scaling.customScalingFunction(min, max, total, this.options.value);
      var sizeDiff = this.options.scaling.max - this.options.scaling.min;
      if (this.options.scaling.label.enabled === true) {
        var fontDiff = this.options.scaling.label.max - this.options.scaling.label.min;
        this.options.font.size = this.options.scaling.label.min + scale * fontDiff;
      }
      this.options.size = this.options.scaling.min + scale * sizeDiff;
    }
    else {
      this.options.size = this.baseSize;
      this.options.font.size = this.baseFontSize;
    }

    this.updateLabelModule();
  }


  /**
   * Draw this node in the given canvas
   * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
   * @param {CanvasRenderingContext2D}   ctx
   */
  draw(ctx) {
    let values = this.getFormattingValues();
    this.shape.draw(ctx, this.x, this.y, this.selected, this.hover, values);
  }


  /**
   * Update the bounding box of the shape
   * @param {CanvasRenderingContext2D}   ctx
   */
  updateBoundingBox(ctx) {
    this.shape.updateBoundingBox(this.x,this.y,ctx);
  }


  /**
   * Recalculate the size of this node in the given canvas
   * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
   * @param {CanvasRenderingContext2D}   ctx
   */
  resize(ctx) {
    let values = this.getFormattingValues();
    this.shape.resize(ctx, this.selected, this.hover, values);
  }


  /**
   * Determine all visual elements of this node instance, in which the given
   * point falls within the bounding shape.
   *
   * @param {point} point
   * @returns {Array.<nodeClickItem|nodeLabelClickItem>} list with the items which are on the point
   */
  getItemsOnPoint(point) {
    var ret = [];

    if (this.labelModule.visible()) {
      if (ComponentUtil.pointInRect(this.labelModule.getSize(), point)) {
        ret.push({nodeId:this.id, labelId:0});
      }
    }

    if (ComponentUtil.pointInRect(this.shape.boundingBox, point)) {
      ret.push({nodeId:this.id});
    }

    return ret;
  }


  /**
   * Check if this object is overlapping with the provided object
   * @param {Object} obj   an object with parameters left, top, right, bottom
   * @return {boolean}     True if location is located on node
   */
  isOverlappingWith(obj) {
    return (
      this.shape.left < obj.right &&
      this.shape.left + this.shape.width > obj.left &&
      this.shape.top < obj.bottom &&
      this.shape.top + this.shape.height > obj.top
    );
  }


  /**
   * Check if this object is overlapping with the provided object
   * @param {Object} obj   an object with parameters left, top, right, bottom
   * @return {boolean}     True if location is located on node
   */
  isBoundingBoxOverlappingWith(obj) {
    return (
      this.shape.boundingBox.left < obj.right &&
      this.shape.boundingBox.right > obj.left &&
      this.shape.boundingBox.top < obj.bottom &&
      this.shape.boundingBox.bottom > obj.top
    );
  }


  /**
  * Check valid values for mass
  *
  * The mass may not be negative or zero. If it is, reset to 1
  *
  * @param {object} options
  * @param {Node.id} id
   * @static
  */
  static checkMass(options, id) {
    if (options.mass !== undefined && options.mass <= 0) {
      let strId = '';
      if (id !== undefined) {
        strId = ' in node id: ' + id;
      }
      console.log('%cNegative or zero mass disallowed' + strId +
                  ', setting mass to 1.' , printStyle);
      options.mass = 1;
    }
  }
}

export default Node;