<?php
header('Content-Type: application/json; charset=utf-8');

// Token/URL aus externer Config laden
require_once __DIR__ . '/config.local.php';

// Entity-ID (Standard: dein Sensor aus der Liste)
$entityId = isset($_GET['entity_id']) ? $_GET['entity_id'] : 'sensor.temp_temperatur';

$url = rtrim(HA_BASE_URL, '/') . '/api/states/' . urlencode($entityId);

$ch = curl_init($url);
curl_setopt_array($ch, [
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_HTTPHEADER => [
    'Authorization: Bearer ' . HA_TOKEN,
    'Content-Type: application/json'
  ],
  CURLOPT_CONNECTTIMEOUT => 3,
  CURLOPT_TIMEOUT => 5,
]);
$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$error    = curl_error($ch);
curl_close($ch);

if ($response === false || $httpCode < 200 || $httpCode >= 300) {
  http_response_code(502);
  echo json_encode([
    'error' => 'Home Assistant request failed',
    'details' => $error ?: ('HTTP ' . $httpCode)
  ]);
  exit;
}

$data = json_decode($response, true);
if (!is_array($data) || !isset($data['state'])) {
  http_response_code(500);
  echo json_encode(['error' => 'Unexpected HA response']);
  exit;
}

$val   = $data['state'];
$unit  = $data['attributes']['unit_of_measurement'] ?? '°C';

$CALIBRATION_OFFSET = +0;

if (is_numeric($val)) {
    $number = round((float)$val + $CALIBRATION_OFFSET, 1);
} else {
    $number = $val;
}

echo json_encode([
  'entity_id'     => $entityId,
  'value'         => $number,
  'unit'          => $unit,
  'friendly_name' => $data['attributes']['friendly_name'] ?? null,
  'last_changed'  => $data['last_changed'] ?? null,
]);