import { HTMLNodeTreeWalker } from "../graphs/HTMLNodeTreeWalker";
import { DOMEditor } from "./DOMEditor";
import { DOMNameSpaces } from "./DOMNameSpaces";

export class ElementAttribute
{
  static readonly nameAttribute = new ElementAttribute( "name", false );
  static readonly style = new ElementAttribute( "style", false );
  static readonly class = new ElementAttribute( "class", false );
  static readonly id = new ElementAttribute( "id", false );
  static readonly href = new ElementAttribute( "href", false );
  static readonly download = new ElementAttribute( "download", false );
  static readonly target = new ElementAttribute( "target", false );
  static readonly type = new ElementAttribute( "type", false );
  static readonly lang = new ElementAttribute( "lang", false );
  static readonly src = new ElementAttribute( "src", false );
  static readonly value = new ElementAttribute( "value", false );
  
  static readonly svgClass = new ElementAttribute( "class", false, "" );
  static readonly xlinkHref = new ElementAttribute( "xlink:href", false, DOMNameSpaces.XLink );

  static readonly contentEditable = new ElementAttribute( "contenteditable", false );
  static readonly allowfullscreen = new ElementAttribute( "allowfullscreen", false );
  static readonly controls = new ElementAttribute( "controls", false );
  static readonly preload = new ElementAttribute( "preload", false );

  static readonly selected = new ElementAttribute( "selected", false );

  static readonly data_lang = new ElementAttribute( "lang" );

  static readonly title = new ElementAttribute( "title", false );
  static readonly width = new ElementAttribute( "width", false );
  static readonly height = new ElementAttribute( "height", false );
  static readonly frameborder = new ElementAttribute( "frameborder", false );
  static readonly allow = new ElementAttribute( "allow", false );
  static readonly autoplay = new ElementAttribute( "autoplay", false );
  static readonly muted = new ElementAttribute( "muted", false );
  static readonly loop = new ElementAttribute( "loop", false );
  static readonly readonly = new ElementAttribute( "readonly", false );

  static readonly dataType = new ElementAttribute( "type" );
  static readonly dataName = new ElementAttribute( "name" );

  static readonly hidden = new ElementAttribute( "hidden", false );

  static readonly rootHref = new ElementAttribute( "root-href" );
  
  private _name:string;
  get name(){ return this._name; }

  get fullName()
  { 
    return this._useDataPrefix ? ( "data-" + this._name ) : this._name; 
  }

  private _useDataPrefix = true;

  private _useNameSpace = false;
  get usesNameSpace(){ return this._useNameSpace; }

  private _nameSpace:string = null;
  get nameSpace(){ return this._nameSpace;}

  constructor( name:string, useDataPrefix:boolean = true, nameSpace:string = null )
  {
    if ( this._name && this._name.startsWith( "data-" ) && useDataPrefix )
    {
      console.warn( 
        `The name of the attribute starts with a 'data-' prefix AND the 'useDataPrefix' at the same time!` );
    }

    this._name = name;
    this._useDataPrefix = useDataPrefix;

    if ( nameSpace )
    {
      this._useNameSpace = true;
      this._nameSpace = nameSpace === "" ? null : nameSpace;
    }
  }

  forAll( target:Element|Document, callback:(element:Element)=>any)
  {
    let elements = target.querySelectorAll( this.selector );
    
    for ( let i = 0; i < elements.length; i++ )
    {
      callback( elements[ i ] );
    }
  }
  

  toString()
  {
    return this.fullName;
  }

  queryDoc()
  {
    return document.querySelector( this.selector ); 
  }


  querySelfOrParent( element:Element )
  {
    if ( this.in( element ) )
    {
      return element;
    }

    return this.queryParent( element );
  }


  queryParent( element:Element )
  {
    let parent = element.parentElement;

    while ( parent )
    {
      if ( this.in( parent ) )
      {
        return parent;
      }

      parent = parent.parentElement;
    }

    return null;

  }

  queryParentValue( element:Element )
  {
    let parent = this.queryParent( element );
    return this.from( parent );
  }

  queryWithValue( element:Element|Document, value:string )
  {
    return element.querySelector( this.selectorEquals( value ) );
  }

  queryDocWithValue( value:string )
  {
    return this.queryWithValue( document, value );
  }

  hasParentWithValue( element:Element, value:string )
  {
    return this.queryParentValue( element ) === value;
  }

  query<T=Element>( element:Element|Document )
  {
    return element.querySelector( this.selector ) as any as T; 
  }

  isQueriedChecked( element:Element )
  {
    let queried = this.query<HTMLInputElement>( element );

    if ( ! queried )
    {
      return false;
    }

    return queried.checked;
  }


  matches( element:Element, regex:RegExp )
  {
    if ( ! this.in( element ) )
    {
      return false;
    }
    
    return regex.exec( this.from( element ) ) !== null; 
  }

  queryDocAll()
  {
    return DOMEditor.nodeListToArray( document.querySelectorAll( this.selector ) ); 
  }

  forEachInDoc( callback:(element:Element)=>void )
  {
    this.queryDocAll().forEach( callback );
  }

  queryAll( t:Element|Document )
  {
    if ( ! this._needsWalker( this.selector ) )
    {
      return this._queryAllQuerySelector( t );
    }

    return this._queryAllWalker( t );
    
  }

  _needsWalker( selector:string )
  {
    if ( "[xlink:href]" == selector )
    {
      return true;
    }

    return false;
  }


  _queryAllQuerySelector( element:Element|Document )
  {
    return DOMEditor.nodeListToArray( element.querySelectorAll( this.selector ) ); 
  }

  _queryAllWalker( t:Element|Document )
  {
    let list:Element[] = [];
    let walker = new HTMLNodeTreeWalker();
    let end = walker.iterationEndOf( t );
    let it:Node = t;

    while ( it !== end ) 
    { 
      if ( Node.ELEMENT_NODE != it.nodeType )
      {
        it = walker.nextNode( it );
        continue;
      }
      
      let element = it as Element;

      if ( this.in( element ) )
      {
        list.push( element );
      }

      it = walker.nextNode( it );
    }
    
    return list;
  }

  queryValueInDoc( element:Element )
  {
    return this.queryValueIn( element, document );
  }

  queryValueIn( element:Element, source:Document|Element = undefined )
  {
    source = source || element;
    
    let selector = this.from( element );
    return source.querySelector( selector );
  }

  
  get selector()
  {
    return `[${this.fullName}]`;
  }

  selectorContaining( fragment:string )
  {
    return `[${this.fullName}*="${fragment}"]`;
  }

  selectorContainingWord( word:string )
  {
    return `[${this.fullName}|="${word}"]`;
  }

  selectorStartsWith( word:string )
  {
    return `[${this.fullName}^="${word}"]`;
  }

  selectorEquals( word:string )
  {    
    let selector = `[${this.fullName}="${word}"]`;
    return selector;
  }

  is( element:Element, value:string|RegExp )
  {
    if ( ! this.in( element ) )
    {
      return false;
    }

    let stringValue = this.from( element );

    if ( typeof value === "string" )
    {
      return value === stringValue;
    }

    return value.test( stringValue );

    
  }


  in( element:Element )
  {
    if ( ! element.attributes )
    {
      return false;
    }

    if ( this._useNameSpace )
    {
      return element.hasAttributeNS( this._nameSpace, this.fullName );
    }

    return element.hasAttribute( this.fullName );
  }

  inAll( elements:Element[] )
  {
    if ( elements.length === 0 )
    {
      return false;
    }

    for ( let e of elements )
    {
      if ( ! this.in( e ) )
      {
        return false;
      }
    }

    return true;
  }

  from( element:Element, alternative:string = null )
  {
    if ( ! element )
    {
      console.log( "Element is null", this );
      return null;
    }

    if ( this._useNameSpace )
    {
      return element.getAttributeNS( this._nameSpace, this.fullName );
    }

    return element.getAttribute( this.fullName ) || alternative;
  }

  toggleRemove( element:Element, value:boolean )
  {
    if ( value )
    {
      this.to( element, "" );
    }
    else
    {
      this.removeFrom( element );
    }
  }

  to( element:Element, value:string|number|boolean = "")
  {
    value = value + "";
    
    if ( ! element )
    {
      console.log( "Element is null", this );
    }

    if ( this._useNameSpace )
    {
      element.setAttributeNS( this._nameSpace, this.fullName, value );
      
      return;
    }

    element.setAttribute( this.fullName, value );
  }

  replaceIn( element:Element, matcher:RegExp, replacement:string )
  {
    let value = this.from( element );
    value = value.replace( matcher, replacement );
    this.to( element, value )
  }

  removeFrom( element:Element )
  {
    if ( this._useNameSpace )
    {
      element.removeAttributeNS( this._nameSpace, this.fullName );
      
      return;
    }

    element.removeAttribute( this.fullName );
  }

  copy( source:Element, target:Element )
  {
    this.to( target, this.from( source ) );
  }

  
}