/**

* @license Apache-2.0

*

* Copyright (c) 2018 The Stdlib Authors.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

'use strict';

// MODULES //

var tape = require( 'tape' );

var noop = require( '@stdlib/utils/noop' );

var randu = require( '@stdlib/random/iter/randu' );

var Float64Array = require( './../../float64' );

var Complex64Array = require( './../../complex64' );

var array2iterator = require( './../../to-iterator' );

var Complex64 = require( '@stdlib/complex/float32/ctor' );

var realf = require( '@stdlib/complex/float32/real' );

var imagf = require( '@stdlib/complex/float32/imag' );

var iterator2array = require( './../lib' );

// TESTS //

tape( 'main export is a function', function test( t ) {

t.ok( true, __filename );

t.strictEqual( typeof iterator2array, 'function', 'main export is a function' );

t.end();

});

tape( 'the function throws an error if provided an iterator argument which is not an iterator', function test( t ) {

var values;

var i;

values = [

'5',

5,

NaN,

true,

false,

null,

void 0,

{},

[],

function noop() {}

];

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

t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );

}

t.end();

function badValue( value ) {

return function badValue() {

iterator2array( value );

};

}

});

tape( 'the function throws an error if provided an iterator argument which is not an iterator (callback)', function test( t ) {

var values;

var i;

values = [

'5',

5,

NaN,

true,

false,

null,

void 0,

{},

[],

function noop() {}

];

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

t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );

}

t.end();

function badValue( value ) {

return function badValue() {

iterator2array( value, noop );

};

}

});

tape( 'the function throws an error if provided an iterator argument which is not an iterator (output argument)', function test( t ) {

var values;

var i;

values = [

'5',

5,

NaN,

true,

false,

null,

void 0,

{},

[],

function noop() {}

];

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

t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );

}

t.end();

function badValue( value ) {

return function badValue() {

iterator2array( value, [] );

};

}

});

tape( 'the function throws an error if provided an iterator argument which is not an iterator (output + callback arguments)', function test( t ) {

var values;

var i;

values = [

'5',

5,

NaN,

true,

false,

null,

void 0,

{},

[],

function noop() {}

];

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

t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );

}

t.end();

function badValue( value ) {

return function badValue() {

iterator2array( value, [], noop );

};

}

});

tape( 'the function throws an error if provided a callback argument which is not a function', function test( t ) {

var values;

var i;

values = [

'5',

5,

NaN,

true,

false,

null,

void 0,

{}

];

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

t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );

}

t.end();

function badValue( value ) {

return function badValue() {

iterator2array( randu(), value );

};

}

});

tape( 'the function throws an error if provided a callback argument which is not a function (output argument)', function test( t ) {

var values;

var i;

values = [

'5',

5,

NaN,

true,

false,

null,

void 0,

[],

{}

];

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

t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );

}

t.end();

function badValue( value ) {

return function badValue() {

iterator2array( randu(), [], value );

};

}

});

tape( 'the function throws an error if provided insufficient arguments', function test( t ) {

t.throws( iterator2array, TypeError, 'throws an error' );

t.end();

});

tape( 'the function creates an array from an iterator', function test( t ) {

var expected;

var values;

var actual;

var it;

values = [ 1, 2, 3, 4 ];

it = array2iterator( values );

actual = iterator2array( it );

expected = values;

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

});

tape( 'the function supports providing a callback to be invoked for each iterated value', function test( t ) {

var expected;

var values;

var actual;

var it;

values = [ 1, 2, 3, 4 ];

it = array2iterator( values );

actual = iterator2array( it, scale );

expected = [ 1, 4, 9, 16 ];

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

function scale( v, i ) {

return v * (i+1);

}

});

tape( 'the function supports filling a provided output array', function test( t ) {

var expected;

var values;

var actual;

var out;

var it;

values = [ 1, 2, 3, 4 ];

it = array2iterator( values );

out = new Float64Array( values.length );

actual = iterator2array( it, out );

expected = new Float64Array( values );

t.strictEqual( actual, out, 'returns expected value' );

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

});

tape( 'the function supports filling a provided output array (accessors)', function test( t ) {

var expected;

var values;

var actual;

var out;

var it;

var z1;

var z2;

var i;

values = [

new Complex64( 1.0, 2.0 ),

new Complex64( 3.0, 4.0 ),

new Complex64( 5.0, 6.0 ),

new Complex64( 7.0, 8.0 )

];

it = array2iterator( values );

out = new Complex64Array( values.length );

actual = iterator2array( it, out );

expected = new Complex64Array( values );

t.strictEqual( actual, out, 'returns expected value' );

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

z1 = actual.get( i );

z2 = expected.get( i );

t.strictEqual( realf( z1 ), realf( z2 ), 'returns expected value' );

t.strictEqual( imagf( z1 ), imagf( z2 ), 'returns expected value' );

}

t.end();

});

tape( 'the function supports filling a provided output array (short iterator)', function test( t ) {

var expected;

var values;

var actual;

var out;

var it;

values = [ 1, 2 ];

it = array2iterator( values );

out = new Float64Array( 4 );

actual = iterator2array( it, out );

expected = new Float64Array( [ 1, 2, 0, 0 ] );

t.strictEqual( actual, out, 'returns expected value' );

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

});

tape( 'the function supports filling a provided output array (callback)', function test( t ) {

var expected;

var values;

var actual;

var out;

var it;

values = [ 1, 2, 3, 4 ];

it = array2iterator( values );

out = new Float64Array( values.length );

actual = iterator2array( it, out, scale );

expected = new Float64Array( [ 1, 4, 9, 16 ] );

t.strictEqual( actual, out, 'returns expected value' );

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

function scale( v, i ) {

return v * (i+1);

}

});

tape( 'the function supports filling a provided output array (callback; short iterator)', function test( t ) {

var expected;

var values;

var actual;

var out;

var it;

values = [ 1, 2 ];

it = array2iterator( values );

out = new Float64Array( 4 );

actual = iterator2array( it, out, scale );

expected = new Float64Array( [ 1, 4, 0, 0 ] );

t.strictEqual( actual, out, 'returns expected value' );

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

function scale( v, i ) {

return v * (i+1);

}

});

tape( 'the function supports specifying the evaluation context of a provided callback', function test( t ) {

var expected;

var actual;

var values;

var ctx;

var it;

values = [ 1, 2, 3, 4 ];

it = array2iterator( values );

ctx = {

'count': 0

};

actual = iterator2array( it, scale, ctx );

expected = [ 1, 4, 9, 16 ];

t.strictEqual( ctx.count, 4, 'returns expected value' );

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

function scale( v, i ) {

this.count += 1; // eslint-disable-line no-invalid-this

return v * (i+1);

}

});

tape( 'the function supports specifying the evaluation context of a provided callback (output argument)', function test( t ) {

var expected;

var values;

var actual;

var out;

var ctx;

var it;

values = [ 1, 2, 3, 4 ];

it = array2iterator( values );

ctx = {

'count': 0

};

out = new Float64Array( values.length );

actual = iterator2array( it, out, scale, ctx );

expected = new Float64Array( [ 1, 4, 9, 16 ] );

t.strictEqual( ctx.count, 4, 'returns expected value' );

t.deepEqual( actual, expected, 'returns expected value' );

t.end();

function scale( v, i ) {

this.count += 1; // eslint-disable-line no-invalid-this

return v * (i+1);

}

});

tape( 'if provided an output argument, the function supports infinite iterators', function test( t ) {

var out = iterator2array( randu(), new Float64Array( 10 ) );

t.strictEqual( out.length, 10, 'has expected length' );

t.end();

});

tape( 'if provided an output argument, the function supports infinite iterators (callback)', function test( t ) {

var out = iterator2array( randu(), new Float64Array( 10 ), scale );

t.strictEqual( out.length, 10, 'has expected length' );

t.end();

function scale( v, i ) {

return v * (i+1);

}

});