<?php

namespace Tests\Unit\Utilities;

use App\Utilities\SystemDatabaseConfiguration;
use PHPUnit\Framework\TestCase;
use RuntimeException;

class SystemDatabaseConfigurationTest extends TestCase
{
    public function test_it_detects_a_complete_system_table_prefix_different_from_current_prefix(): void
    {
        $configuration = new SystemDatabaseConfiguration('unused');

        $prefix = $configuration->detectTablePrefix([
            'ak_migrations',
            'ak_users',
            'ak_companies',
            'ak_roles',
            'ak_permissions',
            'ak_role_permissions',
            'ak_user_roles',
            'ak_user_companies',
            'ak_settings',
            'ak_system_database_connections',
        ], 'a_');

        $this->assertSame('ak_', $prefix);
    }

    public function test_it_prefers_the_current_prefix_when_target_contains_multiple_complete_system_sets(): void
    {
        $configuration = new SystemDatabaseConfiguration('unused');
        $bases = $this->requiredTables();
        $tables = [];

        foreach (['a_', 'ak_'] as $prefix) {
            foreach ($bases as $base) {
                $tables[] = $prefix . $base;
            }
        }

        $this->assertSame('a_', $configuration->detectTablePrefix($tables, 'a_'));
    }

    public function test_it_rejects_a_target_without_one_complete_system_table_set(): void
    {
        $configuration = new SystemDatabaseConfiguration('unused');

        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessage('目标库缺少系统必需表');

        $configuration->detectTablePrefix([
            'ak_migrations',
            'ak_users',
            'ak_roles',
            'ak_settings',
        ], 'a_');
    }

    public function test_it_rejects_an_ambiguous_target_when_current_prefix_is_not_present(): void
    {
        $configuration = new SystemDatabaseConfiguration('unused');
        $bases = $this->requiredTables();
        $tables = [];

        foreach (['first_', 'second_'] as $prefix) {
            foreach ($bases as $base) {
                $tables[] = $prefix . $base;
            }
        }

        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessage('无法自动确定表前缀');

        $configuration->detectTablePrefix($tables, 'a_');
    }

    private function requiredTables(): array
    {
        return [
            'migrations',
            'users',
            'companies',
            'roles',
            'permissions',
            'role_permissions',
            'user_roles',
            'user_companies',
            'settings',
            'system_database_connections',
        ];
    }
}