<?php

namespace PragmaRX\Google2FA\Tests;

use PHPUnit\Framework\TestCase;
use PragmaRX\Google2FA\Google2FA;
use PragmaRX\Google2FA\Support\Constants as Google2FAConstants;

class Google2FATest extends TestCase
{
    public function setUp()
    {
        $this->google2fa = new Google2FA();
    }

    public function test_is_initializable()
    {
        $this->assertInstanceOf('PragmaRX\Google2FA\Google2FA', $this->google2fa);
    }

    public function test_generates_a_valid_secret_key()
    {
        $this->assertEquals(16, strlen($this->google2fa->generateSecretKey()));

        $this->assertEquals(32, strlen($this->google2fa->generateSecretKey(32)));

        $this->assertStringStartsWith('MFXHI', $this->google2fa->generateSecretKey(59, 'ant'));

        $this->assertStringStartsWith('MFXHI', $this->google2fa->generateSecretKey(59, 'ant'));

        $this->assertEquals($key = $this->google2fa->generateSecretKey(), preg_replace('/[^'.Google2FAConstants::VALID_FOR_B32.']/', '', $key));
    }

    /**
     * @expectedException  \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException
     */
    public function test_generates_a_secret_keys_compatible_with_google_authenticator_or_not()
    {
        $this->google2fa->setEnforceGoogleAuthenticatorCompatibility(true)->generateSecretKey(17);

        $this->assertEquals(17, strlen($this->google2fa->setEnforceGoogleAuthenticatorCompatibility(false)->generateSecretKey(17)));
    }

    public function test_converts_invalid_chars_to_base32()
    {
        $converted = $this->google2fa->generateBase32RandomKey(16, '1234'.chr(250).chr(251).chr(252).chr(253).chr(254).chr(255));

        $valid = preg_replace('/[^'.Google2FAConstants::VALID_FOR_B32.']/', '', $converted);

        $this->assertEquals($converted, $valid);
    }

    public function test_gets_valid_timestamps()
    {
        $ts = $this->google2fa->getTimestamp();

        $this->assertLessThanOrEqual(PHP_INT_MAX, $ts);

        $this->assertGreaterThanOrEqual(~PHP_INT_MAX, $ts);
    }

    public function test_decodes_base32_strings()
    {
        $result = chr(0)
            .chr(232)
            .chr(196)
            .chr(187)
            .chr(190)
            .chr(223)
            .chr(26)
            .chr(241)
            .chr(145)
            .chr(86);

        $this->assertEquals($result, $this->google2fa->base32Decode(Constants::SECRET));
    }

    public function test_creates_a_one_time_password()
    {
        $this->assertEquals(6, strlen($this->google2fa->getCurrentOtp(Constants::SECRET)));
    }

    public function test_verifies_keys()
    {
        // $ts 26213400 with KEY_REGENERATION 30 seconds is
        // timestamp 786402000, which is 1994-12-02 21:00:00 UTC

        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '558854', 2, 26213400));  // 26213398
        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '981084', 2, 26213400));  // 26213399
        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '512396', 2, 26213400));  // 26213400
        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '410272', 2, 26213400));  // 26213401
        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '239815', 2, 26213400));  // 26213402

        $this->assertFalse($this->google2fa->verifyKey(Constants::SECRET, '313366', 2, 26213400)); // 26213403
        $this->assertFalse($this->google2fa->verifyKey(Constants::SECRET, '093183', 2, 26213400)); // 26213397
    }

    public function test_verifies_keys_newer()
    {
        $this->assertFalse($this->google2fa->verifyKeyNewer(Constants::SECRET, '512396', 26213401, 2, 26213400));
        $this->assertFalse($this->google2fa->verifyKeyNewer(Constants::SECRET, '410272', 26213401, 2, 26213400));
        $this->assertEquals(26213402, $this->google2fa->verifyKeyNewer(Constants::SECRET, '239815', 26213401, 2, 26213400));
        $this->assertFalse($this->google2fa->verifyKeyNewer(Constants::SECRET, '313366', 26213401, 2, 26213400));

        $this->assertEquals(26213400, $this->google2fa->verifyKeyNewer(Constants::SECRET, '512396', null, 2, 26213400));
        $this->assertEquals(26213401, $this->google2fa->verifyKeyNewer(Constants::SECRET, '410272', null, 2, 26213400));
        $this->assertEquals(26213402, $this->google2fa->verifyKeyNewer(Constants::SECRET, '239815', null, 2, 26213400));
        $this->assertFalse($this->google2fa->verifyKeyNewer(Constants::SECRET, '313366', null, 2, 26213400));
    }

    public function test_removes_invalid_chars_from_secret()
    {
        $this->assertEquals(Constants::SECRET, $this->google2fa->removeInvalidChars(Constants::SECRET.'!1-@@@'));
    }

    public function test_creates_a_qr_code()
    {
        $this->assertEquals(Constants::URL, $this->google2fa->getQRCodeGoogleUrl('PragmaRX', 'acr+pragmarx@antoniocarlosribeiro.com', Constants::SECRET));
    }

    public function test_converts_to_base32()
    {
        $this->assertEquals('KBZGCZ3NMFJFQ', $this->google2fa->toBase32('PragmaRX'));
    }

    public function test_sets_the_window()
    {
        $this->google2fa->setWindow(6);

        $this->assertEquals(6, $this->google2fa->getWindow());

        $this->assertEquals(1, $this->google2fa->getWindow(1));

        $this->google2fa->setWindow(0);

        $this->assertFalse($this->google2fa->verifyKey(Constants::SECRET, '558854', null, 26213400));

        $this->google2fa->setWindow(2);

        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '558854', null, 26213400));
        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '558854', null, 26213399));
        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '558854', null, 26213398));
        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '558854', null, 26213396));
        $this->assertFalse($this->google2fa->verifyKey(Constants::SECRET, '558854', null, 26213395));
    }

    public function test_sets_the_secret()
    {
        $this->assertFalse($this->google2fa->verify('558854', Constants::WRONG_SECRET));

        $this->google2fa->setWindow(2);

        $this->assertTrue($this->google2fa->verify('558854', Constants::SECRET, null, 26213400));

        $this->google2fa->setSecret(Constants::SECRET);

        $this->assertTrue($this->google2fa->verify('558854', null, null, 26213400));
    }

    public function test_gets_key_regeneration()
    {
        $this->google2fa->setKeyRegeneration(11);

        $this->assertEquals(11, $this->google2fa->getKeyRegeneration());
    }

    public function test_gets_otp_length()
    {
        $this->google2fa->setOneTimePasswordLength(7);

        $this->assertEquals(7, $this->google2fa->getOneTimePasswordLength());
    }

    public function test_generates_passwords_in_many_different_sizes()
    {
        $this->google2fa->setWindow(2);

        $this->google2fa->setOneTimePasswordLength(6);

        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '558854', null, 26213400));

        $this->google2fa->setOneTimePasswordLength(7);

        $this->assertTrue($this->google2fa->verifyKey(Constants::SECRET, '8981084', null, 26213400));
    }

    /**
     * @expectedException  \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException
     */
    public function test_short_secret_key()
    {
        $this->google2fa->setEnforceGoogleAuthenticatorCompatibility(false);

        $this->google2fa->verifyKey(Constants::SHORT_SECRET, '558854', null, 26213400);
    }

    /**
     * @expectedException  \PragmaRX\Google2FA\Exceptions\InvalidCharactersException
     */
    public function test_validate_key()
    {
        $this->assertTrue(is_numeric($this->google2fa->getCurrentOtp(Constants::SECRET)));

        $this->google2fa->setEnforceGoogleAuthenticatorCompatibility(false);

        $this->google2fa->getCurrentOtp(Constants::INVALID_SECRET);
    }

    public function test_qrcode_inline()
    {
        $this->assertEquals(
            phpversion() >= '7.2' ? Constants::QRCODEPHPABOVE72 : Constants::QRCODEPHPBELOW72,
            $this->google2fa->getQRCodeInline('PragmaRX', 'acr+pragmarx@antoniocarlosribeiro.com', Constants::SECRET)
        );
    }
}