import { bbox, rbox } from '../types/Box.js'
import { ctm, screenCTM } from '../types/Matrix.js'
import {
  extend,
  getClass,
  makeInstance,
  register,
  root
} from '../utils/adopter.js'
import { globals } from '../utils/window.js'
import { point } from '../types/Point.js'
import { proportionalSize } from '../utils/utils.js'
import { reference } from '../modules/core/regex.js'
import Dom from './Dom.js'
import List from '../types/List.js'
import SVGNumber from '../types/SVGNumber.js'

const Svg = getClass(root)

export default class Element extends Dom {
  constructor (node, attrs) {
    super(node, attrs)

    // initialize data object
    this.dom = {}

    // create circular reference
    this.node.instance = this

    if (node.hasAttribute('svgjs:data')) {
      // pull svgjs data from the dom (getAttributeNS doesn't work in html5)
      this.setData(JSON.parse(node.getAttribute('svgjs:data')) || {})
    }
  }

  // Move element by its center
  center (x, y) {
    return this.cx(x).cy(y)
  }

  // Move by center over x-axis
  cx (x) {
    return x == null ? this.x() + this.width() / 2 : this.x(x - this.width() / 2)
  }

  // Move by center over y-axis
  cy (y) {
    return y == null
      ? this.y() + this.height() / 2
      : this.y(y - this.height() / 2)
  }

  // Get defs
  defs () {
    return this.root().defs()
  }

  // Relative move over x axis
  dx (x) {
    return this.x(new SVGNumber(x).plus(this.x()))
  }

  // Relative move over y axis
  dy (y) {
    return this.y(new SVGNumber(y).plus(this.y()))
  }

  // Get parent document
  root () {
    let p = this.parent(Svg)
    return p && p.root()
  }

  getEventHolder () {
    return this
  }

  // Set height of element
  height (height) {
    return this.attr('height', height)
  }

  // Checks whether the given point inside the bounding box of the element
  inside (x, y) {
    let box = this.bbox()

    return x > box.x
      && y > box.y
      && x < box.x + box.width
      && y < box.y + box.height
  }

  // Move element to given x and y values
  move (x, y) {
    return this.x(x).y(y)
  }

  // return array of all ancestors of given type up to the root svg
  parents (until = globals.document) {
    until = makeInstance(until)
    let parents = new List()
    let parent = this

    while (
      (parent = parent.parent())
      && parent.node !== until.node
      && parent.node !== globals.document
    ) {
      parents.push(parent)
    }

    return parents
  }

  // Get referenced element form attribute value
  reference (attr) {
    attr = this.attr(attr)
    if (!attr) return null

    const m = attr.match(reference)
    return m ? makeInstance(m[1]) : null
  }

  // set given data to the elements data property
  setData (o) {
    this.dom = o
    return this
  }

  // Set element size to given width and height
  size (width, height) {
    let p = proportionalSize(this, width, height)

    return this
      .width(new SVGNumber(p.width))
      .height(new SVGNumber(p.height))
  }

  // Set width of element
  width (width) {
    return this.attr('width', width)
  }

  // write svgjs data to the dom
  writeDataToDom () {
    // remove previously set data
    this.node.removeAttribute('svgjs:data')

    if (Object.keys(this.dom).length) {
      this.node.setAttribute('svgjs:data', JSON.stringify(this.dom)) // see #428
    }

    return super.writeDataToDom()
  }

  // Move over x-axis
  x (x) {
    return this.attr('x', x)
  }

  // Move over y-axis
  y (y) {
    return this.attr('y', y)
  }
}

extend(Element, {
  bbox, rbox, point, ctm, screenCTM
})

register(Element)