<?php

namespace App\Provisioning\Jobs;

use App\Models\VpnPeer;
use App\Services\Wireguard\WireguardHub;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;

/**
 * Push one peer's desired state onto the hub. Runs on the provisioning queue
 * because that is the only worker whose container owns wg0.
 *
 * Takes the public key rather than the model for the removal case: the row is
 * already gone by then, and the hub still has to be told.
 */
class ApplyVpnPeer implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public int $tries = 3;

    public function __construct(
        public string $publicKey,
        public ?string $allowedIp,
        public bool $enabled,
    ) {
        $this->onQueue('provisioning');
    }

    public static function for(VpnPeer $peer): self
    {
        return new self($peer->public_key, $peer->allowed_ip, $peer->enabled);
    }

    public function handle(WireguardHub $hub): void
    {
        // Read the CURRENT desired state rather than the one captured at
        // dispatch time. A retried block job would otherwise undo an unblock
        // that happened in the meantime, and nothing would ever put it back:
        // SyncVpnPeers only observes, it never re-applies intent.
        $peer = VpnPeer::withTrashed()->where('public_key', $this->publicKey)->first();

        // No row, or a revoked one, means the peer must be off the hub. The
        // constructor payload only matters when the row is already gone.
        $enabled = $peer === null
            ? $this->enabled && $this->allowedIp !== null
            : (! $peer->trashed() && $peer->enabled);
        $ip = $peer?->allowed_ip ?? $this->allowedIp;

        if ($enabled && $ip !== null) {
            $hub->addPeer($this->publicKey, $ip);
        } else {
            $hub->removePeer($this->publicKey);
        }

        if ($peer === null) {
            return;
        }

        // The tombstone has served its purpose once the hub has dropped the peer.
        if ($peer->trashed()) {
            $peer->forceDelete();

            return;
        }

        // Reflect the change immediately instead of waiting for the next sync,
        // so the console does not sit on "wird angewendet" for a whole minute.
        $peer->update(['present' => $enabled, 'observed_at' => now()]);
    }
}