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

QUnit.module( "QuadraticBezierCurve", {

	before: function () {

		// from the docs
		this.curve = new THREE.QuadraticBezierCurve(
			new THREE.Vector2( - 10, 0 ),
			new THREE.Vector2( 20, 15 ),
			new THREE.Vector2( 10, 0 )
		);

	}

} );

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

	var curve = this.curve;

	var expectedPoints = [
		new THREE.Vector2( - 10, 0 ),
		new THREE.Vector2( 2.5, 5.625 ),
		new THREE.Vector2( 10, 7.5 ),
		new THREE.Vector2( 12.5, 5.625 ),
		new THREE.Vector2( 10, 0 )
	];

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

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

	// symmetry
	var curveRev = new THREE.QuadraticBezierCurve(
		curve.v2, curve.v1, curve.v0
	);

	points = curveRev.getPoints( expectedPoints.length - 1 );

	assert.strictEqual( points.length, expectedPoints.length, "Reversed: Correct number of points" );
	assert.deepEqual( points, expectedPoints.reverse(), "Reversed: Correct points curve" );

} );

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

	var curve = this.curve;

	var length = curve.getLength();
	var expectedLength = 31.269026549416683;

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

	var expectedLengths = [
		0,
		13.707320124663317,
		21.43814317269643,
		24.56314317269643,
		30.718679298818998
	];
	var lengths = curve.getLengths( expectedLengths.length - 1 );

	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( "getPointAt", function ( assert ) {

	var curve = this.curve;

	var expectedPoints = [
		new THREE.Vector2( - 10, 0 ),
		new THREE.Vector2( - 1.5127849599387615, 3.993582003773624 ),
		new THREE.Vector2( 4.310076165722796, 6.269921971403917 ),
		new THREE.Vector2( 10, 0 )
	];

	var points = [
		curve.getPointAt( 0 ),
		curve.getPointAt( 0.3 ),
		curve.getPointAt( 0.5 ),
		curve.getPointAt( 1 )
	];

	assert.deepEqual( points, expectedPoints, "Correct points" );

} );

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

	var curve = this.curve;

	var expectedTangents = [
		new THREE.Vector2( 0.89443315420562, 0.44720166888975904 ),
		new THREE.Vector2( 0.936329177569021, 0.3511234415884543 ),
		new THREE.Vector2( 1, 0 ),
		new THREE.Vector2( - 5.921189464667277e-13, - 1 ),
		new THREE.Vector2( - 0.5546617882904897, - 0.8320758983472577 )
	];

	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" );

	} );

	//

	expectedTangents = [
		new THREE.Vector2( 0.89443315420562, 0.44720166888975904 ),
		new THREE.Vector2( 0.9125211423360805, 0.40902954024086674 ),
		new THREE.Vector2( 0.9480289098765387, 0.3181842014278863 ),
		new THREE.Vector2( 0.7969127189169473, - 0.6040944615111106 ),
		new THREE.Vector2( - 0.5546617882904897, - 0.8320758983472577 )
	];

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

	expectedTangents.forEach( function ( exp, i ) {

		var tangent = tangents[ i ];

		assert.numEqual( tangent.x, exp.x, "getTangentAt #" + i + ": x correct" );
		assert.numEqual( tangent.y, exp.y, "getTangentAt #" + 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( 0.5, 1 );

	var expectedSomewhere = 0.015073978276116116;

	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( 0.5, 1 ) is correct" );

} );

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

	var curve = this.curve;

	var expectedPoints = [
		new THREE.Vector2( - 10, 0 ),
		new THREE.Vector2( - 4.366603655406173, 2.715408933540383 ),
		new THREE.Vector2( 1.3752241477827831, 5.191972084404416 ),
		new THREE.Vector2( 7.312990279153634, 7.136310044848586 ),
		new THREE.Vector2( 12.499856644824826, 5.653289188715387 ),
		new THREE.Vector2( 10, 0 )
	];

	var points = curve.getSpacedPoints();

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

} );