<?php
session_start();
require_once 'db/config.php';

if (!isset($_SESSION['user_id'])) {
    header("Location: login.php");
    exit();
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $user_id = $_SESSION['user_id'];
    $db = db();

    // Get form data
    $email = $_POST['email'];
    $phone = $_POST['phone'];
    $password = $_POST['password'];
    $password_confirm = $_POST['password_confirm'];
    $location_label = $_POST['location_label'];
    $location_notes = $_POST['location_notes'];
    $lat = $_POST['lat'];
    $lng = $_POST['lng'];

    // --- Validation ---
    if (empty($email)) {
        $_SESSION['error_message'] = "Email is required.";
        header("Location: profile.php");
        exit();
    }

    // Check if email is already taken by another user
    $stmt = $db->prepare("SELECT id FROM users WHERE email = ? AND id != ?");
    $stmt->execute([$email, $user_id]);
    if ($stmt->fetch()) {
        $_SESSION['error_message'] = "Email is already in use by another account.";
        header("Location: profile.php");
        exit();
    }

    // Update basic info
    $sql = "UPDATE users SET email = ?, phone_number = ?, location_label = ?, location_notes = ?, lat = ?, lng = ? WHERE id = ?";
    $params = [$email, $phone, $location_label, $location_notes, $lat, $lng, $user_id];
    $stmt = $db->prepare($sql);
    $stmt->execute($params);

    // Update password if provided and matches confirmation
    if (!empty($password)) {
        if ($password !== $password_confirm) {
            $_SESSION['error_message'] = "Passwords do not match.";
            header("Location: profile.php");
            exit();
        }

        $hashed_password = password_hash($password, PASSWORD_DEFAULT);
        $stmt = $db->prepare("UPDATE users SET password = ? WHERE id = ?");
        $stmt->execute([$hashed_password, $user_id]);
    }

    $_SESSION['success_message'] = "Your profile has been updated successfully.";
    header("Location: profile.php");
    exit();

} else {
    // Redirect if not a POST request
    header("Location: profile.php");
    exit();
}
?>