<?php
header('Content-Type: application/json');
require_once __DIR__ . '/../db/config.php';
$pdo = db();

$method = $_SERVER['REQUEST_METHOD'];

if ($method === 'POST') {
    $input = json_decode(file_get_contents('php://input'), true);
    $weight = filter_var($input['weight'] ?? 0, FILTER_VALIDATE_FLOAT);
    $date = $input['date'] ?? date('Y-m-d');

    if ($weight <= 0) {
        echo json_encode(['success' => false, 'error' => 'Invalid weight']);
        exit;
    }

    try {
        $stmt = $pdo->prepare("INSERT INTO weight_logs (weight, logged_at) VALUES (?, ?) ON DUPLICATE KEY UPDATE weight = VALUES(weight)");
        $stmt->execute([$weight, $date]);
        echo json_encode(['success' => true]);
    } catch (PDOException $e) {
        echo json_encode(['success' => false, 'error' => $e->getMessage()]);
    }
} elseif ($method === 'GET') {
    $stmt = $pdo->query("SELECT weight, logged_at FROM weight_logs ORDER BY logged_at DESC LIMIT 30");
    echo json_encode($stmt->fetchAll(PDO::FETCH_ASSOC));
}