<?php

namespace App\Services;

use App\Models\Device;
use App\Support\Shelly\ShellyRpc;

/**
 * Onboards a Shelly over its LOCAL API — the Home-Assistant way. Given just an IP it reads the
 * device identity + full status, creates (or updates) the device with protocol `http`, and
 * populates its entities. No MQTT setup on the device.
 */
class ShellyLocalOnboarder
{
    public function __construct(
        private readonly ShellyRpc $rpc,
        private readonly ShellyStatusApplier $applier,
    ) {}

    /**
     * @throws \Throwable when the device can't be reached / doesn't speak Shelly RPC
     */
    public function onboard(string $ip, ?string $name = null, ?int $roomId = null): Device
    {
        $info = $this->rpc->info($ip);        // {id, model, gen, name, …} — throws if unreachable
        $status = $this->rpc->status($ip);
        $shellyId = $info['id'] ?? null;

        // Reuse an existing row so switching to local control never duplicates. Match on the STABLE
        // Shelly id first; only reuse an IP match when that row is the SAME (or an unidentified)
        // device — otherwise a DHCP-reassigned IP would let this Shelly overwrite an unrelated one.
        $device = $shellyId ? Device::where('config->mqtt_prefix', $shellyId)->first() : null;

        if ($device === null) {
            $byIp = Device::where('config->ip', $ip)->first();
            $byIpId = $byIp ? data_get($byIp->config, 'mqtt_prefix') : null;
            if ($byIp !== null && (blank($byIpId) || $byIpId === $shellyId)) {
                $device = $byIp;
            }
        }

        $device ??= new Device;

        $device->fill([
            'name' => $name ?: ($device->name ?: ($info['name'] ?? $shellyId ?? $ip)),
            'vendor' => 'Shelly',
            'model' => $info['model'] ?? $device->model,
            'protocol' => 'http',
            'status' => 'active',
            'last_seen_at' => now(),
        ]);
        if ($roomId !== null) {
            $device->room_id = $roomId;
        }
        $device->config = array_merge($device->config ?? [], array_filter([
            'ip' => $ip,
            'transport' => 'local',
            'mqtt_prefix' => $shellyId,   // keep so discovery dedup + optional MQTT still work
        ], fn ($v) => $v !== null));
        $device->save();

        $this->applier->applyStatus($device, $status, (int) round(microtime(true) * 1_000_000));

        return $device;
    }
}