/**
 * @author mrdoob / http://mrdoob.com/
 */

var UI = {};

UI.Element = function ( dom ) {

	this.dom = dom;

};

UI.Element.prototype = {

	add: function () {

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

			var argument = arguments[ i ];

			if ( argument instanceof UI.Element ) {

				this.dom.appendChild( argument.dom );

			} else {

				console.error( 'UI.Element:', argument, 'is not an instance of UI.Element.' );

			}

		}

		return this;

	},

	remove: function () {

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

			var argument = arguments[ i ];

			if ( argument instanceof UI.Element ) {

				this.dom.removeChild( argument.dom );

			} else {

				console.error( 'UI.Element:', argument, 'is not an instance of UI.Element.' );

			}

		}

		return this;

	},

	clear: function () {

		while ( this.dom.children.length ) {

			this.dom.removeChild( this.dom.lastChild );

		}

	},

	setId: function ( id ) {

		this.dom.id = id;

		return this;

	},

	getId: function ( id ) {

		return this.dom.id;

	},

	setClass: function ( name ) {

		this.dom.className = name;

		return this;

	},

	addClass: function ( name ) {

		this.dom.classList.add( name );

		return this;

	},

	removeClass: function ( name ) {

		this.dom.classList.remove( name );

		return this;

	},

	setStyle: function ( style, array ) {

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

			this.dom.style[ style ] = array[ i ];

		}

		return this;

	},

	setDisabled: function ( value ) {

		this.dom.disabled = value;

		return this;

	},

	setTextContent: function ( value ) {

		this.dom.textContent = value;

		return this;

	}

};

// properties

var properties = [ 'position', 'left', 'top', 'right', 'bottom', 'width', 'height', 'border', 'borderLeft',
	'borderTop', 'borderRight', 'borderBottom', 'borderColor', 'display', 'overflow', 'margin', 'marginLeft', 'marginTop', 'marginRight', 'marginBottom', 'padding', 'paddingLeft', 'paddingTop', 'paddingRight', 'paddingBottom', 'color',
	'background', 'backgroundColor', 'opacity', 'fontSize', 'fontWeight', 'textAlign', 'textDecoration', 'textTransform', 'cursor', 'zIndex' ];

properties.forEach( function ( property ) {

	var method = 'set' + property.substr( 0, 1 ).toUpperCase() + property.substr( 1, property.length );

	UI.Element.prototype[ method ] = function () {

		this.setStyle( property, arguments );

		return this;

	};

} );

// events

var events = [ 'KeyUp', 'KeyDown', 'MouseOver', 'MouseOut', 'Click', 'DblClick', 'Change' ];

events.forEach( function ( event ) {

	var method = 'on' + event;

	UI.Element.prototype[ method ] = function ( callback ) {

		this.dom.addEventListener( event.toLowerCase(), callback.bind( this ), false );

		return this;

	};

} );

// Span

UI.Span = function () {

	UI.Element.call( this );

	this.dom = document.createElement( 'span' );

	return this;

};

UI.Span.prototype = Object.create( UI.Element.prototype );
UI.Span.prototype.constructor = UI.Span;

// Div

UI.Div = function () {

	UI.Element.call( this );

	this.dom = document.createElement( 'div' );

	return this;

};

UI.Div.prototype = Object.create( UI.Element.prototype );
UI.Div.prototype.constructor = UI.Div;

// Row

UI.Row = function () {

	UI.Element.call( this );

	var dom = document.createElement( 'div' );
	dom.className = 'Row';

	this.dom = dom;

	return this;

};

UI.Row.prototype = Object.create( UI.Element.prototype );
UI.Row.prototype.constructor = UI.Row;

// Panel

UI.Panel = function () {

	UI.Element.call( this );

	var dom = document.createElement( 'div' );
	dom.className = 'Panel';

	this.dom = dom;

	return this;

};

UI.Panel.prototype = Object.create( UI.Element.prototype );
UI.Panel.prototype.constructor = UI.Panel;

// Text

UI.Text = function ( text ) {

	UI.Element.call( this );

	var dom = document.createElement( 'span' );
	dom.className = 'Text';
	dom.style.cursor = 'default';
	dom.style.display = 'inline-block';
	dom.style.verticalAlign = 'middle';

	this.dom = dom;
	this.setValue( text );

	return this;

};

UI.Text.prototype = Object.create( UI.Element.prototype );
UI.Text.prototype.constructor = UI.Text;

UI.Text.prototype.getValue = function () {

	return this.dom.textContent;

};

UI.Text.prototype.setValue = function ( value ) {

	if ( value !== undefined ) {

		this.dom.textContent = value;

	}

	return this;

};


// Input

UI.Input = function ( text ) {

	UI.Element.call( this );

	var scope = this;

	var dom = document.createElement( 'input' );
	dom.className = 'Input';
	dom.style.padding = '2px';
	dom.style.border = '1px solid transparent';

	dom.addEventListener( 'keydown', function ( event ) {

		event.stopPropagation();

	}, false );

	this.dom = dom;
	this.setValue( text );

	return this;

};

UI.Input.prototype = Object.create( UI.Element.prototype );
UI.Input.prototype.constructor = UI.Input;

UI.Input.prototype.getValue = function () {

	return this.dom.value;

};

UI.Input.prototype.setValue = function ( value ) {

	this.dom.value = value;

	return this;

};


// TextArea

UI.TextArea = function () {

	UI.Element.call( this );

	var scope = this;

	var dom = document.createElement( 'textarea' );
	dom.className = 'TextArea';
	dom.style.padding = '2px';
	dom.spellcheck = false;

	dom.addEventListener( 'keydown', function ( event ) {

		event.stopPropagation();

		if ( event.keyCode === 9 ) {

			event.preventDefault();

			var cursor = dom.selectionStart;

			dom.value = dom.value.substring( 0, cursor ) + '\t' + dom.value.substring( cursor );
			dom.selectionStart = cursor + 1;
			dom.selectionEnd = dom.selectionStart;

		}

	}, false );

	this.dom = dom;

	return this;

};

UI.TextArea.prototype = Object.create( UI.Element.prototype );
UI.TextArea.prototype.constructor = UI.TextArea;

UI.TextArea.prototype.getValue = function () {

	return this.dom.value;

};

UI.TextArea.prototype.setValue = function ( value ) {

	this.dom.value = value;

	return this;

};


// Select

UI.Select = function () {

	UI.Element.call( this );

	var scope = this;

	var dom = document.createElement( 'select' );
	dom.className = 'Select';
	dom.style.padding = '2px';

	this.dom = dom;

	return this;

};

UI.Select.prototype = Object.create( UI.Element.prototype );
UI.Select.prototype.constructor = UI.Select;

UI.Select.prototype.setMultiple = function ( boolean ) {

	this.dom.multiple = boolean;

	return this;

};

UI.Select.prototype.setOptions = function ( options ) {

	var selected = this.dom.value;

	while ( this.dom.children.length > 0 ) {

		this.dom.removeChild( this.dom.firstChild );

	}

	for ( var key in options ) {

		var option = document.createElement( 'option' );
		option.value = key;
		option.innerHTML = options[ key ];
		this.dom.appendChild( option );

	}

	this.dom.value = selected;

	return this;

};

UI.Select.prototype.getValue = function () {

	return this.dom.value;

};

UI.Select.prototype.setValue = function ( value ) {

	value = String( value );

	if ( this.dom.value !== value ) {

		this.dom.value = value;

	}

	return this;

};

// Checkbox

UI.Checkbox = function ( boolean ) {

	UI.Element.call( this );

	var scope = this;

	var dom = document.createElement( 'input' );
	dom.className = 'Checkbox';
	dom.type = 'checkbox';

	this.dom = dom;
	this.setValue( boolean );

	return this;

};

UI.Checkbox.prototype = Object.create( UI.Element.prototype );
UI.Checkbox.prototype.constructor = UI.Checkbox;

UI.Checkbox.prototype.getValue = function () {

	return this.dom.checked;

};

UI.Checkbox.prototype.setValue = function ( value ) {

	if ( value !== undefined ) {

		this.dom.checked = value;

	}

	return this;

};


// Color

UI.Color = function () {

	UI.Element.call( this );

	var scope = this;

	var dom = document.createElement( 'input' );
	dom.className = 'Color';
	dom.style.width = '64px';
	dom.style.height = '17px';
	dom.style.border = '0px';
	dom.style.padding = '2px';
	dom.style.backgroundColor = 'transparent';

	try {

		dom.type = 'color';
		dom.value = '#ffffff';

	} catch ( exception ) {}

	this.dom = dom;

	return this;

};

UI.Color.prototype = Object.create( UI.Element.prototype );
UI.Color.prototype.constructor = UI.Color;

UI.Color.prototype.getValue = function () {

	return this.dom.value;

};

UI.Color.prototype.getHexValue = function () {

	return parseInt( this.dom.value.substr( 1 ), 16 );

};

UI.Color.prototype.setValue = function ( value ) {

	this.dom.value = value;

	return this;

};

UI.Color.prototype.setHexValue = function ( hex ) {

	this.dom.value = '#' + ( '000000' + hex.toString( 16 ) ).slice( - 6 );

	return this;

};


// Number

UI.Number = function ( number ) {

	UI.Element.call( this );

	var scope = this;

	var dom = document.createElement( 'input' );
	dom.className = 'Number';
	dom.value = '0.00';

	dom.addEventListener( 'keydown', function ( event ) {

		event.stopPropagation();

		if ( event.keyCode === 13 ) dom.blur();

	}, false );

	this.value = 0;

	this.min = - Infinity;
	this.max = Infinity;

	this.precision = 2;
	this.step = 1;
	this.unit = '';

	this.dom = dom;

	this.setValue( number );

	var changeEvent = document.createEvent( 'HTMLEvents' );
	changeEvent.initEvent( 'change', true, true );

	var distance = 0;
	var onMouseDownValue = 0;

	var pointer = [ 0, 0 ];
	var prevPointer = [ 0, 0 ];

	function onMouseDown( event ) {

		event.preventDefault();

		distance = 0;

		onMouseDownValue = scope.value;

		prevPointer = [ event.clientX, event.clientY ];

		document.addEventListener( 'mousemove', onMouseMove, false );
		document.addEventListener( 'mouseup', onMouseUp, false );

	}

	function onMouseMove( event ) {

		var currentValue = scope.value;

		pointer = [ event.clientX, event.clientY ];

		distance += ( pointer[ 0 ] - prevPointer[ 0 ] ) - ( pointer[ 1 ] - prevPointer[ 1 ] );

		var value = onMouseDownValue + ( distance / ( event.shiftKey ? 5 : 50 ) ) * scope.step;
		value = Math.min( scope.max, Math.max( scope.min, value ) );

		if ( currentValue !== value ) {

			scope.setValue( value );
			dom.dispatchEvent( changeEvent );

		}

		prevPointer = [ event.clientX, event.clientY ];

	}

	function onMouseUp( event ) {

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		if ( Math.abs( distance ) < 2 ) {

			dom.focus();
			dom.select();

		}

	}

	function onTouchStart( event ) {

		if ( event.touches.length === 1 ) {

			distance = 0;

			onMouseDownValue = scope.value;

			prevPointer = [ event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ];

			document.addEventListener( 'touchmove', onTouchMove, false );
			document.addEventListener( 'touchend', onTouchEnd, false );

		}

	}

	function onTouchMove( event ) {

		var currentValue = scope.value;

		pointer = [ event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ];

		distance += ( pointer[ 0 ] - prevPointer[ 0 ] ) - ( pointer[ 1 ] - prevPointer[ 1 ] );

		var value = onMouseDownValue + ( distance / ( event.shiftKey ? 5 : 50 ) ) * scope.step;
		value = Math.min( scope.max, Math.max( scope.min, value ) );

		if ( currentValue !== value ) {

			scope.setValue( value );
			dom.dispatchEvent( changeEvent );

		}

		prevPointer = [ event.touches[ 0 ].pageX, event.touches[ 0 ].pageY ];

	}

	function onTouchEnd( event ) {

		if ( event.touches.length === 0 ) {

			document.removeEventListener( 'touchmove', onTouchMove, false );
			document.removeEventListener( 'touchend', onTouchEnd, false );

		}

	}

	function onChange( event ) {

		scope.setValue( dom.value );

	}

	function onFocus( event ) {

		dom.style.backgroundColor = '';
		dom.style.cursor = '';

	}

	function onBlur( event ) {

		dom.style.backgroundColor = 'transparent';
		dom.style.cursor = 'col-resize';

	}

	onBlur();

	dom.addEventListener( 'mousedown', onMouseDown, false );
	dom.addEventListener( 'touchstart', onTouchStart, false );
	dom.addEventListener( 'change', onChange, false );
	dom.addEventListener( 'focus', onFocus, false );
	dom.addEventListener( 'blur', onBlur, false );

	return this;

};

UI.Number.prototype = Object.create( UI.Element.prototype );
UI.Number.prototype.constructor = UI.Number;

UI.Number.prototype.getValue = function () {

	return this.value;

};

UI.Number.prototype.setValue = function ( value ) {

	if ( value !== undefined ) {

		value = parseFloat( value );

		if ( value < this.min ) value = this.min;
		if ( value > this.max ) value = this.max;

		this.value = value;
		this.dom.value = value.toFixed( this.precision );

		if ( this.unit !== '' ) this.dom.value += ' ' + this.unit;

	}

	return this;

};

UI.Number.prototype.setPrecision = function ( precision ) {

	this.precision = precision;

	return this;

};

UI.Number.prototype.setStep = function ( step ) {

	this.step = step;

	return this;

};

UI.Number.prototype.setRange = function ( min, max ) {

	this.min = min;
	this.max = max;

	return this;

};

UI.Number.prototype.setUnit = function ( unit ) {

	this.unit = unit;

	return this;

};

// Integer

UI.Integer = function ( number ) {

	UI.Element.call( this );

	var scope = this;

	var dom = document.createElement( 'input' );
	dom.className = 'Number';
	dom.value = '0';

	dom.addEventListener( 'keydown', function ( event ) {

		event.stopPropagation();

	}, false );

	this.value = 0;

	this.min = - Infinity;
	this.max = Infinity;

	this.step = 1;

	this.dom = dom;

	this.setValue( number );

	var changeEvent = document.createEvent( 'HTMLEvents' );
	changeEvent.initEvent( 'change', true, true );

	var distance = 0;
	var onMouseDownValue = 0;

	var pointer = [ 0, 0 ];
	var prevPointer = [ 0, 0 ];

	function onMouseDown( event ) {

		event.preventDefault();

		distance = 0;

		onMouseDownValue = scope.value;

		prevPointer = [ event.clientX, event.clientY ];

		document.addEventListener( 'mousemove', onMouseMove, false );
		document.addEventListener( 'mouseup', onMouseUp, false );

	}

	function onMouseMove( event ) {

		var currentValue = scope.value;

		pointer = [ event.clientX, event.clientY ];

		distance += ( pointer[ 0 ] - prevPointer[ 0 ] ) - ( pointer[ 1 ] - prevPointer[ 1 ] );

		var value = onMouseDownValue + ( distance / ( event.shiftKey ? 5 : 50 ) ) * scope.step;
		value = Math.min( scope.max, Math.max( scope.min, value ) ) | 0;

		if ( currentValue !== value ) {

			scope.setValue( value );
			dom.dispatchEvent( changeEvent );

		}

		prevPointer = [ event.clientX, event.clientY ];

	}

	function onMouseUp( event ) {

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		if ( Math.abs( distance ) < 2 ) {

			dom.focus();
			dom.select();

		}

	}

	function onChange( event ) {

		scope.setValue( dom.value );

	}

	function onFocus( event ) {

		dom.style.backgroundColor = '';
		dom.style.cursor = '';

	}

	function onBlur( event ) {

		dom.style.backgroundColor = 'transparent';
		dom.style.cursor = 'col-resize';

	}

	onBlur();

	dom.addEventListener( 'mousedown', onMouseDown, false );
	dom.addEventListener( 'change', onChange, false );
	dom.addEventListener( 'focus', onFocus, false );
	dom.addEventListener( 'blur', onBlur, false );

	return this;

};

UI.Integer.prototype = Object.create( UI.Element.prototype );
UI.Integer.prototype.constructor = UI.Integer;

UI.Integer.prototype.getValue = function () {

	return this.value;

};

UI.Integer.prototype.setValue = function ( value ) {

	if ( value !== undefined ) {

		value = parseInt( value );

		this.value = value;
		this.dom.value = value;

	}

	return this;

};

UI.Integer.prototype.setStep = function ( step ) {

	this.step = parseInt( step );

	return this;

};

UI.Integer.prototype.setRange = function ( min, max ) {

	this.min = min;
	this.max = max;

	return this;

};


// Break

UI.Break = function () {

	UI.Element.call( this );

	var dom = document.createElement( 'br' );
	dom.className = 'Break';

	this.dom = dom;

	return this;

};

UI.Break.prototype = Object.create( UI.Element.prototype );
UI.Break.prototype.constructor = UI.Break;


// HorizontalRule

UI.HorizontalRule = function () {

	UI.Element.call( this );

	var dom = document.createElement( 'hr' );
	dom.className = 'HorizontalRule';

	this.dom = dom;

	return this;

};

UI.HorizontalRule.prototype = Object.create( UI.Element.prototype );
UI.HorizontalRule.prototype.constructor = UI.HorizontalRule;


// Button

UI.Button = function ( value ) {

	UI.Element.call( this );

	var dom = document.createElement( 'button' );
	dom.className = 'Button';

	this.dom = dom;
	this.dom.textContent = value;

	return this;

};

UI.Button.prototype = Object.create( UI.Element.prototype );
UI.Button.prototype.constructor = UI.Button;

UI.Button.prototype.setLabel = function ( value ) {

	this.dom.textContent = value;

	return this;

};


// TabbedPanel

UI.TabbedPanel = function ( ) {

	UI.Element.call( this );

	var dom = document.createElement('div');
	
	this.dom = dom;

	this.setClass( 'TabbedPanel' );

	this.tabs = [];
	this.panels = [];

	this.tabsDiv = new UI.Div();
	this.tabsDiv.setClass( 'Tabs' );

	this.panelsDiv = new UI.Div();
	this.panelsDiv.setClass( 'Panels' );

	this.add( this.tabsDiv );
	this.add( this.panelsDiv );

	this.selected = '';

	return this;

}

UI.TabbedPanel.prototype = Object.create( UI.Element.prototype );
UI.TabbedPanel.prototype.constructor = UI.TabbedPanel;

UI.TabbedPanel.prototype.select = function ( id ) {

	var tab;
	var panel;
	var scope = this;
	
	// Deselect current selection
	if ( this.selected && this.selected.length ) {
		tab = this.tabs.find( function ( item ) { return item.dom.id === scope.selected } );
		panel = this.panels.find( function ( item ) { return item.dom.id === scope.selected } );

		if ( tab ) {

			tab.removeClass( 'selected' );

		}

		if( panel ) {

			panel.setDisplay( 'none' );

		}

	}

	tab = this.tabs.find( function ( item ) { return item.dom.id === id } );
	panel = this.panels.find( function ( item ) { return item.dom.id === id } );
	
	if ( tab ) {

		tab.addClass( 'selected' );

	}

	if( panel ) {

		panel.setDisplay( '' );

	}

	this.selected = id;

	return this;

}

UI.TabbedPanel.prototype.addPanel = function ( id, label, items ) {

	var tab = new UI.TabbedPanel.Tab( label, this );
	tab.setId( id );
	this.tabs.push( tab );
	this.tabsDiv.add( tab );

	var panel = new UI.Div();
	panel.setId( id );
	panel.add( items );
	panel.setDisplay( 'none' );
	this.panels.push( panel );
	this.panelsDiv.add( panel );

	this.select( id );

}

UI.TabbedPanel.Tab = function ( text, parent ) {

	UI.Text.call( this, text );
	this.parent = parent;

	this.setClass( 'Tab' );

	var scope = this;
	this.dom.addEventListener( 'click', function ( event ) {

		scope.parent.select( scope.dom.id );

	} )

	return this;

}

UI.TabbedPanel.Tab.prototype = Object.create( UI.Text.prototype );
UI.TabbedPanel.Tab.prototype.constructor = UI.TabbedPanel.Tab;

// Listbox
UI.Listbox = function ( ) {

	UI.Element.call( this );

	var dom = document.createElement( 'div' );
	dom.className = 'Listbox';
	dom.tabIndex = 0;

	this.dom = dom;
	this.items = [];
	this.listitems = [];
	this.selectedIndex = 0;
	this.selectedValue = null;

	return this;

}

UI.Listbox.prototype = Object.create( UI.Element.prototype );
UI.Listbox.prototype.constructor = UI.ListboxItem;

UI.Listbox.prototype.setItems = function ( items ) {

	if ( Array.isArray( items ) ) {

		this.items = items;

	}

	this.render( );

}

UI.Listbox.prototype.render = function ( ) {

	while( this.listitems.length ) {

		var item = this.listitems[0];

		item.dom.remove();

		this.listitems.splice(0, 1);

	}

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

		var item = this.items[i];

		var listitem = new UI.Listbox.ListboxItem( this );
		listitem.setId( item.id || `Listbox-${i}` );
		listitem.setTextContent( item.name || item.type );
		this.add( listitem );

	}

}

// Assuming user passes valid list items
UI.Listbox.prototype.add = function (  ) {

	var items = Array.from( arguments );

	this.listitems = this.listitems.concat( items );

	UI.Element.prototype.add.apply( this, items );

}

UI.Listbox.prototype.selectIndex = function ( index ) {

	if ( index >= 0 && index < this.items.length ) {

		this.setValue( this.listitems[ index ].getId(  ) );

	}

	this.selectIndex = index;

}

UI.Listbox.prototype.getValue = function ( index ) {

	return this.selectedValue;

}

UI.Listbox.prototype.setValue = function ( value ) {

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

		var element = this.listitems[ i ];

		if ( element.getId( ) === value ) {

			element.addClass( 'active' );

		} else {
			
			element.removeClass( 'active' );

		}

	}

	this.selectedValue = value;

	var changeEvent = document.createEvent( 'HTMLEvents' );
	changeEvent.initEvent( 'change', true, true );
	this.dom.dispatchEvent( changeEvent );

}

// Listbox Item
UI.Listbox.ListboxItem = function ( parent ) {

	UI.Element.call( this );

	var dom = document.createElement( 'div' );
	dom.className = 'ListboxItem';

	this.parent = parent;
	this.dom = dom;

	var scope = this;

	function onClick ( ) {
		
		if( scope.parent ) {
			scope.parent.setValue( scope.getId( ) );
		}

	}

	dom.addEventListener( 'click', onClick, false );

	return this;

}

UI.Listbox.ListboxItem.prototype = Object.create( UI.Element.prototype );
UI.Listbox.ListboxItem.prototype.constructor = UI.Listbox.ListboxItem;