import {
  extend,
  nodeOrNew,
  register,
  wrapWithAttrCheck
} from '../utils/adopter.js'
import { registerMethods } from '../utils/methods.js'
import Text from './Text.js'
import * as textable from '../modules/core/textable.js'

export default class Tspan extends Text {

  // Initialize node
  constructor ( node ) {

    super( nodeOrNew( 'tspan', node ), node )

  }

  // Set text content
  text ( text ) {

    if ( text == null ) return this.node.textContent + ( this.dom.newLined ? '\n' : '' )

    typeof text === 'function' ? text.call( this, this ) : this.plain( text )

    return this

  }

  // Shortcut dx
  dx ( dx ) {

    return this.attr( 'dx', dx )

  }

  // Shortcut dy
  dy ( dy ) {

    return this.attr( 'dy', dy )

  }

  // Create new line
  newLine () {

    // fetch text parent
    var t = this.parent( Text )

    // mark new line
    this.dom.newLined = true

    // apply new position
    return this.dy( t.dom.leading * t.attr( 'font-size' ) ).attr( 'x', t.x() )

  }

}

extend( Tspan, textable )

registerMethods( {
  Tspan: {
    tspan: wrapWithAttrCheck( function ( text ) {

      var tspan = new Tspan()

      // clear if build mode is disabled
      if ( !this._build ) {

        this.clear()

      }

      // add new tspan
      this.node.appendChild( tspan.node )

      return tspan.text( text )

    } )
  }
} )

register( Tspan )