export default class queryManager{

	selectors	= new Array();


	createSelector( character, name ) {

		var selector = new Object();

		selector.character 	= character;

		selector.name 		= name;

		this.selectors.push( selector );

	}

	constructor() {

		this.createSelector( "#", "id" )

		this.createSelector( ":", "selector" )

		this.createSelector( "@", "propertyName" )

	}

	query( query, unifyObject ) {

		var terms				= query.split(" ");

		var objectSelection		= new Array( unifyObject );

		for ( var i = 0; i < terms.length; i++ ) {

			var term 				= terms[i];

			objectSelection 		= this.processTerm( term, objectSelection );

		}

		//console.log( objectSelection );

		return objectSelection;

	}

	clone( object ) {

		return JSON.parse( JSON.stringify( object ) )

	}

	processTerm( term, objectSelection ) {

		//console.log("\n\n" )

		//console.log( "process term", term );
		
		var newSelection	= new Array();

		for (var j = 0; j < objectSelection.length; j++) {

			var currentObjectSelection 	= objectSelection[j];

			var selected				= this.processSelector( term, currentObjectSelection );

			newSelection = [...newSelection, ...selected]

		}

		return newSelection;

	}

	processSelector( term, objectSelection ) {

		var allSelectors	= new Array();

	
		for ( var j = 0; j < this.selectors.length; j++ ) {

			var selector 				= this.selectors[j];

			var indices					= this.getIndicesOf( selector.character, term );


			for (var i = 0; i < indices.length; i++) {

				var index 						= indices[i];

				var uniuqeSelector				= this.clone( selector );

				uniuqeSelector.startIndex		= index;

				allSelectors.push( uniuqeSelector );
				

			}

		}

		var sortedSelectors	=  allSelectors.sort( function ( a, b ) { return a.startIndex - b.startIndex } );


		var firstSelector	= sortedSelectors[0];

		//console.log(allSelectors);

		if( firstSelector ) {

			var startIndex				= firstSelector.startIndex;

		} else {

			var createFirstSelector 	= true;

		}

		if( createFirstSelector || startIndex != 0 ) {

			var selector 			= new Object();

			selector.character 		= "";

			selector.name 			= "className";

			selector.startIndex		= 0;


			sortedSelectors = this.addItemToStartOfArray( sortedSelectors, selector );

		}


		for (var i = 0; i < sortedSelectors.length; i++) {

			var selector 			= sortedSelectors[i];

			var nextSelector		= sortedSelectors[i+1];

			var currentStartIndex 	= selector.startIndex;

			if( nextSelector ) {

				var nextStartIndex		= nextSelector.startIndex;

			} else {

				var nextStartIndex		= term.length;

			}

			selector.term 			= term.substr( currentStartIndex + selector.character.length, nextStartIndex - currentStartIndex - selector.character.length );

		}

		

		var objectSelection	= new Array( objectSelection );

		//console.log("	process selector", term, sortedSelectors)


		for ( var i = 0; i < sortedSelectors.length; i++ ) {

			//console.log("		executeSelector", objectSelection);

			var selector 		= sortedSelectors[i];

			objectSelection 	= this.executeSelector( selector, objectSelection );

			//console.log( "	objectSelection", objectSelection );
		}




		//console.log( "	objectSelection", objectSelection );

		return objectSelection;	

	}

	executeSelector( selector, ObjectSelection ) {

		var name		= selector.name;

		switch( name ) {

			case "className":

				var allSelectors	= new Array();

				for (var i = 0; i < ObjectSelection.length; i++) {

					var currentUnifyObject 	= ObjectSelection[i];

					//console.log(currentUnifyObject);

					//console.log("		currentUnifyObject.findAll( selector.term )", selector.term);

					// by class name
					var results 		= currentUnifyObject.findAll( selector.term );

					allSelectors = [...allSelectors, ...results]
					

				}

				ObjectSelection = allSelectors

				//console.log("		afterObjectSelection", ObjectSelection);


			break;



			case "propertyName":

				if( selector.startIndex == 0 ) {

					var allSelectors	= new Array();

					for (var i = 0; i < ObjectSelection.length; i++) {

						var currentUnifyObject 	= ObjectSelection[i];

						var results 			= currentUnifyObject.getByPropertyName( selector.term );

						allSelectors 			= [...allSelectors, ...results]
						

					}

					ObjectSelection = allSelectors


				} else {

					for (var i = 0; i < ObjectSelection.length; i++) {

						var currentUnifyObject 	= ObjectSelection[i];

						//console.log("currentUnifyObject.findChildByID( selector.term )", selector.term);

						if( currentUnifyObject.propertyName == selector.term ) {

							return new Array( currentUnifyObject );

						} else {

							return new Array( );

						}
						// by class name
						//ObjectSelection 		= currentUnifyObject.getChildById( selector.term );

					}

				}



			break;



			case "id":

				if( selector.startIndex == 0 ) {

					var allSelectors	= new Array();

					for (var i = 0; i < ObjectSelection.length; i++) {

						var currentUnifyObject 	= ObjectSelection[i];

						var results 		= currentUnifyObject.getByID( selector.term );

						allSelectors = [...allSelectors, ...results]
						

					}

					ObjectSelection = allSelectors


				} else {

					for (var i = 0; i < ObjectSelection.length; i++) {

						var currentUnifyObject 	= ObjectSelection[i];

						//console.log("currentUnifyObject.findChildByID( selector.term )", selector.term);

						if( currentUnifyObject.id == selector.term ) {

							return new Array( currentUnifyObject );

						} else {

							return new Array( );

						}
						// by class name
						//ObjectSelection 		= currentUnifyObject.getChildById( selector.term );

					}

				}



			break;


			case "selector":

				var term					= selector.term;

				switch( term ) {

					case "first-child":

						//console.log("return ObjectSelection[0];", term);

						if( ObjectSelection[0] ) {

							return new Array( ObjectSelection[0] );

						} else {

							return new Array( );

						}
						
						
					break;



					case "last-child":

						//console.log("return ObjectSelection[ObjectSelection.length-1]", term);

						var lastObject = ObjectSelection[ObjectSelection.length-1];

						if( lastObject ) {

							return new Array( lastObject );

						} else {

							return new Array( );

						}
						
						
					break;


				}



			break;

		}

		return ObjectSelection;

	}

	addItemToStartOfArray( array, newFirstElement ) {

		return [ newFirstElement ].concat( array )

	}

	getIndicesOf( searchStr, str, caseSensitive ) {

		var searchStrLen = searchStr.length;

		if ( searchStrLen == 0 ) {

			return new Array();

		}

		var startIndex = 0;

		var index;

		var indices = new Array();

		if ( !caseSensitive ) {

			str 		= str.toLowerCase();

			searchStr 	= searchStr.toLowerCase();

		}

		while ( ( index = str.indexOf( searchStr, startIndex ) ) > -1 ) {

			indices.push( index );

			startIndex 	= index + searchStrLen;

		}

		return indices;
	}

}