export interface IRect {
    x:number;
    y:number;
    width:number;
    height:number;
}

export namespace autoFit {
	export enum ScaleMode {
		NONE,
		WIDTH,
		HEIGHT,
		INSIDE,
		OUTSIDE
	}

	export enum AlignMode {
		TL,
		TC,
		CC,
		BC,
		BL,
		NONE
	}


	export function fit(targetArea:IRect, rSource:IRect, scaleMode:ScaleMode, alignMode:AlignMode = AlignMode.CC):IRect {
		switch ( scaleMode ) {
			case ScaleMode.NONE:
				align( targetArea , rSource , alignMode );
				break;
			case ScaleMode.INSIDE:
				align( targetArea , proportional_inside( targetArea , rSource ) , alignMode );
				break;
			case ScaleMode.OUTSIDE:
				align( targetArea , proportional_outside( targetArea , rSource ) , alignMode );
				break;
			case ScaleMode.WIDTH:
				 align( targetArea , width_only( targetArea , rSource ) , alignMode );
				break;
			case ScaleMode.HEIGHT:
				align( targetArea , height_only( targetArea , rSource ) , alignMode );
				break;
		}
		return rSource;
	}



	function width_only(targetArea:IRect, rSource:IRect):IRect {
		let s:number = targetArea.width / rSource.width;
		rSource.width *= s;
		rSource.height *= s;
		return rSource;
	}

	function height_only(targetArea:IRect, rSource:IRect):IRect {
		let s:number = targetArea.height / rSource.height;
		rSource.width *= s;
		rSource.height *= s;
		return rSource;
	}


	function proportional_inside(targetArea:IRect, rSource:IRect):IRect {
		let sx:number = targetArea.width / rSource.width;
		let sy:number = targetArea.height / rSource.height;
		let s:number = Math.min( sx , sy );
		rSource.width *= s;
		rSource.height *= s;
		return rSource;
	}




	function proportional_outside( targetArea:IRect , rSource:IRect ):IRect {
		let sx:number = targetArea.width / rSource.width;
		let sy:number = targetArea.height / rSource.height;
		let s:number = Math.max( sx , sy );
		rSource.width = rSource.width * s;
		rSource.height = rSource.height * s;
		return rSource;
	}


	function align(targetArea:IRect , rSource:IRect , strAlign:AlignMode ):IRect {
		switch( strAlign ) {
			case AlignMode.TC:
				setCenter(targetArea, rSource, true, false);
				rSource.x = targetArea.x;
				break;
			case AlignMode.CC:
				setCenter(targetArea, rSource);
				break;
			case AlignMode.TL:
				rSource.x = targetArea.x;
				rSource.y = targetArea.y;
				break;
			case AlignMode.BC:
				setCenter( targetArea, rSource , true , false );
				rSource.y = targetArea.y + targetArea.height - rSource.height;
				break;
			case AlignMode.BL:
				rSource.x = targetArea.x;
				rSource.y = targetArea.y + targetArea.height - rSource.height;
				break;
			case AlignMode.NONE:
				//아무것도 안함.
				break;
		}
		return rSource;
	}






	export function setCenter( targetArea:IRect, rSource:IRect, axisX:Boolean=true , axisY:Boolean=true ):void {
		let r:IRect = targetArea;
		if( axisX ) {
			rSource.x = r.x + r.width/2 - rSource.width/2;
		}
		if( axisY ) {
			rSource.y = r.y + r.height/2 - rSource.height/2;
		}
	}
}