<?php

namespace App\Services\Link;

use App\Models\LinkClick;
use App\Models\LinkWallet;
use App\Models\ShortLink;
use App\Support\Link\LinkGeoResolver;
use App\Support\Link\LinkUserAgentParser;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class LinkClickRecorder
{
    public function record(ShortLink $link, Request $request): void
    {
        $ipHash = hash('sha256', $request->ip().'|'.config('app.key'));
        $windowHours = (int) config('link.click_unique_window_hours', 24);
        $isUnique = ! LinkClick::query()
            ->where('short_link_id', $link->id)
            ->where('ip_hash', $ipHash)
            ->where('clicked_at', '>=', now()->subHours($windowHours))
            ->exists();

        $parsed = LinkUserAgentParser::parse((string) $request->userAgent());

        DB::transaction(function () use ($link, $request, $ipHash, $isUnique, $parsed) {
            LinkClick::create([
                'short_link_id' => $link->id,
                'ip_hash' => $ipHash,
                'user_agent' => $this->truncate($request->userAgent(), 512),
                'referer' => $this->truncate($request->header('referer'), 512),
                'device_type' => $parsed['device_type'],
                'browser' => $parsed['browser'],
                'os' => $parsed['os'],
                'country' => LinkGeoResolver::countryCode($request),
                'is_unique' => $isUnique,
                'clicked_at' => now(),
            ]);

            $link->increment('clicks_total');
            if ($isUnique) {
                $link->increment('unique_clicks_total');
            }
            $link->update(['last_clicked_at' => now()]);

            LinkWallet::query()
                ->where('user_id', $link->user_id)
                ->increment('clicks_total');
        });
    }

    private function truncate(?string $value, int $max): ?string
    {
        if ($value === null) {
            return null;
        }

        return mb_strlen($value) > $max ? mb_substr($value, 0, $max) : $value;
    }
}