<?php

namespace App\Support\Drivers;

use App\Models\Device;
use App\Models\Entity;
use App\Support\Mqtt\ShellyTopics;
use PhpMqtt\Client\Facades\MQTT;

/**
 * Controls Shelly Gen2+ devices via JSON-RPC over MQTT on `<prefix>/rpc`
 * (e.g. Switch.Set / Light.Set / Shelly.Reboot). Gen2+ does not accept the simple
 * command topic. The device applies the change and publishes a fresh
 * `<prefix>/status/<component>` which our listener ingests. Vendor specifics stay here (H3).
 */
class ShellyMqttDriver implements DeviceDriver
{
    private const RPC_SRC = 'homeos';

    public function turnOn(Entity $entity): void
    {
        $this->setComponentOn($entity, true);
    }

    public function turnOff(Entity $entity): void
    {
        $this->setComponentOn($entity, false);
    }

    public function setState(Entity $entity, array $state): void
    {
        if (array_key_exists('on', $state)) {
            $this->setComponentOn($entity, (bool) $state['on']);
        }
    }

    public function reboot(Device $device): void
    {
        $this->rpc($device, 'Shelly.Reboot');
    }

    /** Light.Set with optional brightness (0–100) and rgb ([r,g,b]) for RGBW lights. */
    public function setLight(Entity $entity, array $params): void
    {
        [, $id] = array_pad(explode(':', $entity->key, 2), 2, '0');

        $rpc = ['id' => (int) $id];
        if (array_key_exists('on', $params)) {
            $rpc['on'] = (bool) $params['on'];
        }
        if (isset($params['brightness'])) {
            $rpc['brightness'] = max(0, min(100, (int) $params['brightness']));
        }
        if (isset($params['rgb']) && is_array($params['rgb'])) {
            $rpc['rgb'] = array_map(fn ($v) => max(0, min(255, (int) $v)), array_slice($params['rgb'], 0, 3));
        }

        $this->rpc($entity->device, 'Light.Set', $rpc);
    }

    public function capabilities(): array
    {
        return ['switch', 'light'];
    }

    /** Map an entity ("switch:0", "light:0") to the matching Gen2 Set RPC. */
    private function setComponentOn(Entity $entity, bool $on): void
    {
        [$component, $id] = array_pad(explode(':', $entity->key, 2), 2, '0');

        // Switch.Set / Light.Set — component name capitalised.
        $this->rpc($entity->device, ucfirst($component).'.Set', ['id' => (int) $id, 'on' => $on]);
    }

    private function rpc(Device $device, string $method, array $params = []): void
    {
        $payload = ['id' => 1, 'src' => self::RPC_SRC, 'method' => $method];

        if ($params !== []) {
            $payload['params'] = $params;
        }

        MQTT::connection()->publish(ShellyTopics::rpcTopic($this->prefixOf($device)), json_encode($payload), 0);
    }

    private function prefixOf(Device $device): string
    {
        $prefix = data_get($device->config, 'mqtt_prefix');

        if (blank($prefix)) {
            throw new \RuntimeException("Device {$device->id} has no mqtt_prefix configured.");
        }

        return $prefix;
    }
}