// Copyright Joyent, Inc. and other Node contributors.

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

const common = require('../common');

const assert = require('assert');

const zero = [];

const one = [ Buffer.from('asdf') ];

const long = [];

for (let i = 0; i < 10; i++) long.push(Buffer.from('asdf'));

const flatZero = Buffer.concat(zero);

const flatOne = Buffer.concat(one);

const flatLong = Buffer.concat(long);

const flatLongLen = Buffer.concat(long, 40);

assert.strictEqual(flatZero.length, 0);

assert.strictEqual(flatOne.toString(), 'asdf');

const check = 'asdf'.repeat(10);

// A special case where concat used to return the first item,

// if the length is one. This check is to make sure that we don't do that.

assert.notStrictEqual(flatOne, one[0]);

assert.strictEqual(flatLong.toString(), check);

assert.strictEqual(flatLongLen.toString(), check);

[undefined, null, Buffer.from('hello')].forEach((value) => {

assert.throws(() => {

Buffer.concat(value);

}, {

code: 'ERR_INVALID_ARG_TYPE',

message: 'The "list" argument must be an instance of Array.' +

`${common.invalidArgTypeHelper(value)}`

});

});

[[42], ['hello', Buffer.from('world')]].forEach((value) => {

assert.throws(() => {

Buffer.concat(value);

}, {

code: 'ERR_INVALID_ARG_TYPE',

message: 'The "list[0]" argument must be an instance of Buffer ' +

`or Uint8Array.${common.invalidArgTypeHelper(value[0])}`

});

});

assert.throws(() => {

Buffer.concat([Buffer.from('hello'), 3]);

}, {

code: 'ERR_INVALID_ARG_TYPE',

message: 'The "list[1]" argument must be an instance of Buffer ' +

'or Uint8Array. Received type number (3)'

});

// eslint-disable-next-line node-core/crypto-check

const random10 = common.hasCrypto ?

require('crypto').randomBytes(10) :

Buffer.alloc(10, 1);

const empty = Buffer.alloc(0);

assert.notDeepStrictEqual(random10, empty);

assert.notDeepStrictEqual(random10, Buffer.alloc(10));

assert.deepStrictEqual(Buffer.concat([], 100), empty);

assert.deepStrictEqual(Buffer.concat([random10], 0), empty);

assert.deepStrictEqual(Buffer.concat([random10], 10), random10);

assert.deepStrictEqual(Buffer.concat([random10, random10], 10), random10);

assert.deepStrictEqual(Buffer.concat([empty, random10]), random10);

assert.deepStrictEqual(Buffer.concat([random10, empty, empty]), random10);

// The tail should be zero-filled

assert.deepStrictEqual(Buffer.concat([empty], 100), Buffer.alloc(100));

assert.deepStrictEqual(Buffer.concat([empty], 4096), Buffer.alloc(4096));

assert.deepStrictEqual(

Buffer.concat([random10], 40),

Buffer.concat([random10, Buffer.alloc(30)]));

assert.deepStrictEqual(Buffer.concat([new Uint8Array([0x41, 0x42]),

new Uint8Array([0x43, 0x44])]),

Buffer.from('ABCD'));