<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class PageVisit extends Model
{
    public $timestamps = false;

    protected $fillable = [
        'channel_id',
        'client_uid',
        'session_id',
        'user_agent',
        'os',
        'os_version',
        'browser',
        'browser_version',
        'ip',
        'domain',
        'referer',
        'created_at',
    ];

    protected function casts(): array
    {
        return [
            'created_at' => 'datetime',
        ];
    }

    public static function normalizeDomain(?string $value): ?string
    {
        $value = trim((string) $value);
        if ($value === '') {
            return null;
        }
        $value = preg_replace('#^https?://#i', '', $value) ?? $value;
        $value = explode('/', $value, 2)[0];
        $value = strtolower(rtrim($value));
        if ($value === '' || ! str_contains($value, '.')) {
            return null;
        }

        return substr($value, 0, 255);
    }

    public const VISITOR_UID_LENGTH = 16;

    /**
     * Stable visitor id: same domain+ip always yields the same 16-hex value.
     */
    public static function visitorUid(?string $domain, ?string $ip): string
    {
        $domainKey = self::normalizeDomain($domain) ?? strtolower(trim((string) $domain));
        $ipKey = trim((string) $ip);

        return substr(hash('sha256', $domainKey."\0".$ipKey), 0, self::VISITOR_UID_LENGTH);
    }
}