<?php

declare(strict_types=1);

namespace SixShop\Wangdian\Tests\Unit\Auth;

use PHPUnit\Framework\TestCase;
use SixShop\Wangdian\Auth\Authenticator;
use SixShop\Wangdian\Config\Config;

class AuthenticatorTest extends TestCase
{
    private Authenticator $authenticator;
    private Config $config;

    protected function setUp(): void
    {
        $this->config = new Config(
            sid: 'test_sid',
            appKey: 'test_app_key',
            appSecret: 'test_app_secret'
        );
        $this->authenticator = new Authenticator($this->config);
    }

    public function testGenerateSignature(): void
    {
        $params = [
            'shop_no' => 'test_shop',
            'trade_list' => '[{"trade_no":"123"}]'
        ];

        $signature = $this->authenticator->generateSignature($params);

        $this->assertIsString($signature);
        $this->assertEquals(32, strlen($signature)); // MD5 hash length
        $this->assertMatchesRegularExpression('/^[a-f0-9]{32}$/', $signature);
    }

    public function testGenerateSignatureRemovesExistingSign(): void
    {
        $params = [
            'shop_no' => 'test_shop',
            'sign' => 'old_signature'
        ];

        $signature1 = $this->authenticator->generateSignature($params);
        
        unset($params['sign']);
        $signature2 = $this->authenticator->generateSignature($params);

        $this->assertEquals($signature1, $signature2);
    }

    public function testGenerateSignatureConsistency(): void
    {
        $params = [
            'shop_no' => 'test_shop',
            'trade_list' => '[{"trade_no":"123"}]'
        ];

        $signature1 = $this->authenticator->generateSignature($params);
        $signature2 = $this->authenticator->generateSignature($params);

        // Note: signatures will be different due to timestamp, but structure should be consistent
        $this->assertIsString($signature1);
        $this->assertIsString($signature2);
        $this->assertEquals(32, strlen($signature1));
        $this->assertEquals(32, strlen($signature2));
    }

    public function testAddAuthParams(): void
    {
        $params = ['shop_no' => 'test_shop'];

        $authenticatedParams = $this->authenticator->addAuthParams($params);

        $this->assertArrayHasKey('sid', $authenticatedParams);
        $this->assertArrayHasKey('appkey', $authenticatedParams);
        $this->assertArrayHasKey('timestamp', $authenticatedParams);
        $this->assertArrayHasKey('sign', $authenticatedParams);
        $this->assertArrayHasKey('shop_no', $authenticatedParams);

        $this->assertEquals('test_sid', $authenticatedParams['sid']);
        $this->assertEquals('test_app_key', $authenticatedParams['appkey']);
        $this->assertEquals('test_shop', $authenticatedParams['shop_no']);
        $this->assertIsInt($authenticatedParams['timestamp']);
        $this->assertIsString($authenticatedParams['sign']);
        $this->assertEquals(32, strlen($authenticatedParams['sign']));
    }

    public function testAddAuthParamsOverwritesExisting(): void
    {
        $params = [
            'shop_no' => 'test_shop',
            'sid' => 'old_sid',
            'appkey' => 'old_appkey',
            'timestamp' => 123456,
            'sign' => 'old_sign'
        ];

        $authenticatedParams = $this->authenticator->addAuthParams($params);

        $this->assertEquals('test_sid', $authenticatedParams['sid']);
        $this->assertEquals('test_app_key', $authenticatedParams['appkey']);
        $this->assertNotEquals(123456, $authenticatedParams['timestamp']);
        $this->assertNotEquals('old_sign', $authenticatedParams['sign']);
    }

    public function testValidateParamsSuccess(): void
    {
        $params = [
            'sid' => 'test_sid',
            'appkey' => 'test_app_key',
            'timestamp' => time()
        ];

        // Should not throw exception
        $this->authenticator->validateParams($params);
        $this->assertTrue(true); // Assert that we reach this point
    }

    public function testValidateParamsMissingSid(): void
    {
        $params = [
            'appkey' => 'test_app_key',
            'timestamp' => time()
        ];

        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Missing required parameter: sid');

        $this->authenticator->validateParams($params);
    }

    public function testValidateParamsMissingAppkey(): void
    {
        $params = [
            'sid' => 'test_sid',
            'timestamp' => time()
        ];

        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Missing required parameter: appkey');

        $this->authenticator->validateParams($params);
    }

    public function testValidateParamsMissingTimestamp(): void
    {
        $params = [
            'sid' => 'test_sid',
            'appkey' => 'test_app_key'
        ];

        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Missing required parameter: timestamp');

        $this->authenticator->validateParams($params);
    }

    public function testValidateParamsEmptyValues(): void
    {
        $params = [
            'sid' => '',
            'appkey' => 'test_app_key',
            'timestamp' => time()
        ];

        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Missing required parameter: sid');

        $this->authenticator->validateParams($params);
    }

    public function testPackDataFormat(): void
    {
        // Test the pack data format by using reflection to access private method
        $reflection = new \ReflectionClass($this->authenticator);
        $packDataMethod = $reflection->getMethod('packData');
        $packDataMethod->setAccessible(true);

        $params = [
            'b' => 'second',
            'a' => 'first'
        ];

        $packed = $packDataMethod->invoke($this->authenticator, $params);

        // Should be sorted by key: a first, then b
        // Format: length-key:length-value;length-key:length-value
        $expected = '01-a:0005-first;01-b:0006-second';
        $this->assertEquals($expected, $packed);
    }

    public function testPackDataWithUtf8(): void
    {
        $reflection = new \ReflectionClass($this->authenticator);
        $packDataMethod = $reflection->getMethod('packData');
        $packDataMethod->setAccessible(true);

        $params = [
            'name' => '测试'
        ];

        $packed = $packDataMethod->invoke($this->authenticator, $params);

        // UTF-8 characters should be properly counted
        $expected = '04-name:0002-测试';
        $this->assertEquals($expected, $packed);
    }

    public function testPackDataSkipsSignParameter(): void
    {
        $reflection = new \ReflectionClass($this->authenticator);
        $packDataMethod = $reflection->getMethod('packData');
        $packDataMethod->setAccessible(true);

        $params = [
            'a' => 'value',
            'sign' => 'should_be_ignored'
        ];

        $packed = $packDataMethod->invoke($this->authenticator, $params);

        $expected = '01-a:0005-value';
        $this->assertEquals($expected, $packed);
    }
}