/**
 * @author moraxy / https://github.com/moraxy
 */

QUnit.module( "EllipseCurve", {

	before: function () {

		// from the docs
		this.curve = new THREE.EllipseCurve(
			0, 0, // ax, aY
			10, 10, // xRadius, yRadius
			0, 2 * Math.PI, // aStartAngle, aEndAngle
			false, // aClockwise
			0 // aRotation
		);

	}

} );

QUnit.test( "Simple curve", function ( assert ) {

	var curve = this.curve;

	var expectedPoints = [
		new THREE.Vector2( 10, 0 ),
		new THREE.Vector2( 0, 10 ),
		new THREE.Vector2( - 10, 0 ),
		new THREE.Vector2( 0, - 10 ),
		new THREE.Vector2( 10, 0 )
	];

	var points = curve.getPoints( expectedPoints.length - 1 );

	assert.strictEqual( points.length, expectedPoints.length, "Correct number of points" );

	points.forEach( function ( point, i ) {

		assert.numEqual( point.x, expectedPoints[ i ].x, "point[" + i + "].x correct" );
		assert.numEqual( point.y, expectedPoints[ i ].y, "point[" + i + "].y correct" );

	} );

} );

QUnit.test( "getLength/getLengths", function ( assert ) {

	var curve = this.curve;

	var length = curve.getLength();
	var expectedLength = 62.829269247282795;

	assert.numEqual( length, expectedLength, "Correct length of curve" );

	var lengths = curve.getLengths( 5 );
	var expectedLengths = [
		0,
		11.755705045849462,
		23.51141009169892,
		35.26711513754839,
		47.02282018339785,
		58.77852522924731
	];

	assert.strictEqual( lengths.length, expectedLengths.length, "Correct number of segments" );

	lengths.forEach( function ( segment, i ) {

		assert.numEqual( segment, expectedLengths[ i ], "segment[" + i + "] correct" );

	} );

} );

QUnit.test( "getPoint/getPointAt", function ( assert ) {

	var curve = this.curve;

	var testValues = [ 0, 0.3, 0.5, 0.7, 1 ];

	testValues.forEach( function ( val, i ) {

		var expectedX = Math.cos( val * Math.PI * 2 ) * 10;
		var expectedY = Math.sin( val * Math.PI * 2 ) * 10;

		var p = curve.getPoint( val );
		var a = curve.getPointAt( val );

		assert.numEqual( p.x, expectedX, "getPoint(" + val + ").x correct" );
		assert.numEqual( p.y, expectedY, "getPoint(" + val + ").y correct" );

		assert.numEqual( a.x, expectedX, "getPointAt(" + val + ").x correct" );
		assert.numEqual( a.y, expectedY, "getPointAt(" + val + ").y correct" );

	} );

} );

QUnit.test( "getTangent", function ( assert ) {

	var curve = this.curve;

	var expectedTangents = [
		new THREE.Vector2( - 0.000314159260186071, 0.9999999506519786 ),
		new THREE.Vector2( - 1, 0 ),
		new THREE.Vector2( 0, - 1 ),
		new THREE.Vector2( 1, 0 ),
		new THREE.Vector2( 0.00031415926018600165, 0.9999999506519784 )
	];

	var tangents = [
		curve.getTangent( 0 ),
		curve.getTangent( 0.25 ),
		curve.getTangent( 0.5 ),
		curve.getTangent( 0.75 ),
		curve.getTangent( 1 )
	];

	expectedTangents.forEach( function ( exp, i ) {

		var tangent = tangents[ i ];

		assert.numEqual( tangent.x, exp.x, "getTangent #" + i + ": x correct" );
		assert.numEqual( tangent.y, exp.y, "getTangent #" + i + ": y correct" );

	} );

} );

QUnit.test( "getUtoTmapping", function ( assert ) {

	var curve = this.curve;

	var start = curve.getUtoTmapping( 0, 0 );
	var end = curve.getUtoTmapping( 0, curve.getLength() );
	var somewhere = curve.getUtoTmapping( 0.7, 1 );

	var expectedSomewhere = 0.01591614882650014;

	assert.strictEqual( start, 0, "getUtoTmapping( 0, 0 ) is the starting point" );
	assert.strictEqual( end, 1, "getUtoTmapping( 0, length ) is the ending point" );
	assert.numEqual( somewhere, expectedSomewhere, "getUtoTmapping( 0.7, 1 ) is correct" );

} );

QUnit.test( "getSpacedPoints", function ( assert ) {

	var curve = this.curve;

	var expectedPoints = [
		new THREE.Vector2( 10, 0 ),
		new THREE.Vector2( 3.0901699437494603, 9.51056516295154 ),
		new THREE.Vector2( - 8.090169943749492, 5.877852522924707 ),
		new THREE.Vector2( - 8.090169943749459, - 5.877852522924751 ),
		new THREE.Vector2( 3.0901699437494807, - 9.510565162951533 ),
		new THREE.Vector2( 10, - 2.4492935982947065e-15 )
	];

	var points = curve.getSpacedPoints();

	assert.strictEqual( points.length, expectedPoints.length, "Correct number of points" );

	expectedPoints.forEach( function ( exp, i ) {

		var point = points[ i ];

		assert.numEqual( point.x, exp.x, "Point #" + i + ": x correct" );
		assert.numEqual( point.y, exp.y, "Point #" + i + ": y correct" );

	} );

} );