<?php
/**
 * api/heatmap.php — Titik kepadatan kemiskinan agregat (KF-08).
 *
 * GET → daftar [lat, lng, weight] tanpa data pribadi (aman untuk publik).
 *   weight = jumlah_tanggungan + 1 (intensitas kepadatan).
 */
require_once __DIR__ . '/../config/db.php';
require_once __DIR__ . '/helpers.php';

$pdo = Database::getConnection();

if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    sendError('Method not allowed', 405);
}

$stmt = $pdo->query(
    "SELECT ST_Y(geom) AS lat, ST_X(geom) AS lng, jumlah_tanggungan
     FROM warga_miskin"
);

$points = [];
while ($r = $stmt->fetch()) {
    $points[] = [
        (float)$r['lat'],
        (float)$r['lng'],
        (int)$r['jumlah_tanggungan'] + 1,
    ];
}

sendSuccess($points, 'Heatmap Kepadatan');