<?php

namespace App\Support\Mqtt;

/**
 * Normalizes a Shelly Gen2+ status payload for one component into protocol-agnostic
 * entity updates ({key, type, state}). One message can update several entities
 * (e.g. a switch also carries power). Vendor specifics stay here (H3).
 */
class ShellyNormalizer
{
    /**
     * @param  array<string,mixed>  $payload
     * @return array<int, array{key:string,type:string,state:array<string,mixed>}>
     */
    public static function normalize(string $component, array $payload): array
    {
        [$kind, $index] = array_pad(explode(':', $component, 2), 2, '0');
        $updates = [];

        switch ($kind) {
            case 'switch':
                $updates[] = ['key' => "switch:{$index}", 'type' => 'switch', 'state' => ['on' => (bool) ($payload['output'] ?? false)]];
                if (array_key_exists('apower', $payload)) {
                    $updates[] = ['key' => "power:{$index}", 'type' => 'power', 'state' => ['watts' => (int) round((float) $payload['apower'])]];
                }
                break;

            case 'light':
                $updates[] = ['key' => "light:{$index}", 'type' => 'light', 'state' => ['on' => (bool) ($payload['output'] ?? $payload['ison'] ?? false)]];
                break;

            case 'cover':
                $updates[] = ['key' => "cover:{$index}", 'type' => 'cover', 'state' => ['position' => $payload['current_pos'] ?? null, 'state' => $payload['state'] ?? null]];
                break;

            case 'temperature':
                $updates[] = ['key' => "temperature:{$index}", 'type' => 'temperature', 'state' => ['celsius' => $payload['tC'] ?? null]];
                break;

            case 'humidity':
                $updates[] = ['key' => "humidity:{$index}", 'type' => 'humidity', 'state' => ['percent' => $payload['rh'] ?? null]];
                break;

            case 'devicepower':
                if (($pct = data_get($payload, 'battery.percent')) !== null) {
                    $updates[] = ['key' => "battery:{$index}", 'type' => 'battery', 'state' => ['percent' => (int) $pct]];
                }
                break;

            default:
                // Unknown component — store the raw payload under its own key.
                $updates[] = ['key' => $component, 'type' => $kind, 'state' => $payload];
        }

        return $updates;
    }
}