<?php
session_start();
header('Content-Type: application/json');

require_once __DIR__ . '/../includes/thingspeak.php';

$channel_id = $_SESSION['channel_id'] ?? null;
$api_key = $_SESSION['api_key'] ?? null;

if (!$channel_id || !$api_key) {
    echo json_encode(['error' => 'Not connected. Please set Channel ID and API Key.']);
    exit;
}

$data = fetch_thingspeak_data($channel_id, $api_key, 50); // Fetch more points for better clustering

if ($data && !empty($data['feeds'])) {
    echo json_encode($data['feeds']);
} else {
    echo json_encode(['error' => 'Failed to fetch data from ThingSpeak.']);
}