<?php

namespace Tests\Unit;

use App\Services\AzerothCoreAccountDumpReader;
use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\TestCase;
use RuntimeException;

class AzerothCoreAccountDumpReaderTest extends TestCase
{
    private array $files = [];

    protected function tearDown(): void
    {
        foreach ($this->files as $path) {
            unlink($path);
        }
        parent::tearDown();
    }

    public function test_reads_mysqldump_column_order_and_escaped_binary_without_hex_blob(): void
    {
        $bytes = "\0\n\r\t\x08\x1a'\"\\".substr(hash('sha256', 'fixture', true), 0, 23);
        $literal = strtr($bytes, [
            "\0" => '\\0', "\n" => '\\n', "\r" => '\\r', "\t" => '\\t',
            "\x08" => '\\b', "\x1a" => '\\Z', "'" => "\\'", '"' => '\\"', '\\' => '\\\\',
        ]);
        $sql = <<<SQL
        -- mysqldump without --hex-blob
        USE `acore_auth`;
        CREATE TABLE `account` (
          `id` int unsigned NOT NULL,
          `username` varchar(32) NOT NULL,
          `salt` binary(32) NOT NULL,
          `verifier` binary(32) NOT NULL,
          `email` varchar(255) DEFAULT NULL,
          PRIMARY KEY (`id`),
          KEY `email_index` (`email`)
        ) ENGINE=InnoDB;
        INSERT INTO `account` VALUES (42,'SINDORING',_binary '$literal','$literal',NULL),(43,'SECOND',0x00,X'ff','quoted''mail');
        CREATE TABLE `account_access` (`id` int NOT NULL, `gmlevel` tinyint NOT NULL, `RealmID` int NOT NULL);
        INSERT INTO `account_access` VALUES (42,3,-1);
        SQL;
        $rows = iterator_to_array((new AzerothCoreAccountDumpReader)->rows($this->file($sql)));
        $this->assertCount(3, $rows);
        $this->assertSame('account', $rows[0]['table']);
        $this->assertSame(['id' => '42', 'username' => 'SINDORING', 'salt' => $bytes, 'verifier' => $bytes, 'email' => null], $rows[0]['row']);
        $this->assertSame("\0", $rows[1]['row']['salt']);
        $this->assertSame("\xff", $rows[1]['row']['verifier']);
        $this->assertSame("quoted'mail", $rows[1]['row']['email']);
        $this->assertSame(['table' => 'account_access', 'row' => ['id' => '42', 'gmlevel' => '3', 'RealmID' => '-1']], $rows[2]);
    }

    public function test_gzip_filters_source_database_and_ignores_unrelated_sql(): void
    {
        $sql = <<<'SQL'
        USE `other_auth`;
        INSERT INTO `account` (`id`,`username`) VALUES (1,'OTHER');
        DROP DATABASE `moonwell-web`;
        USE `acore_auth`;
        INSERT IGNORE INTO `account` (`id`,`username`,`email`) VALUES (42,_utf8mb4 'SINDORING','semicolon;value');
        INSERT INTO `other_auth`.`account_access` (`id`,`gmlevel`) VALUES (1,3);
        SQL;
        $rows = iterator_to_array((new AzerothCoreAccountDumpReader)->rows($this->file(gzencode($sql))));
        $this->assertSame([['table' => 'account', 'row' => ['id' => '42', 'username' => 'SINDORING', 'email' => 'semicolon;value']]], $rows);
    }

    #[DataProvider('invalidStatements')]
    public function test_rejects_unsupported_or_incomplete_account_sql(string $sql): void
    {
        $this->expectException(RuntimeException::class);
        iterator_to_array((new AzerothCoreAccountDumpReader)->rows($this->file($sql)));
    }

    public static function invalidStatements(): array
    {
        return [
            'missing column definitions' => ["INSERT INTO `account` VALUES (1,'PLAYER');"],
            'column count mismatch' => ["INSERT INTO `account` (`id`) VALUES (1,'PLAYER');"],
            'truncated' => ['INSERT INTO `account` (`id`) VALUES (1'],
            'expressions' => ["INSERT INTO `account` (`salt`) VALUES (UNHEX('abcd'));"],
            'appended SQL' => ['INSERT INTO `account` (`id`) VALUES (1); DROP DATABASE `web`;'],
        ];
    }

    private function file(string $contents): string
    {
        $path = tempnam(sys_get_temp_dir(), 'auth-parser-');
        file_put_contents($path, $contents);
        $this->files[] = $path;

        return $path;
    }
}