<?php
// Use environment variables for the database password and IP address.
$db_user = $_ENV['DATABASE_USER'];
$db_pass = $_ENV['DATABASE_PASSWORD'];
$ip_addr = $_ENV['IP_ADDRESS'];

// Make some constants
if ($_SERVER['HTTP_HOST'] == 'localhost') {
    define('HOST', 'localhost');
    define('USER', $db_user);
    define('PASS', $db_pass);
    define('DB', 'vintagecoding');
} else {
    define('HOST', $ip_addr);
    define('USER', $db_user);
    define('PASS', $db_pass);
    define('DB', 'vintagecoding');
}

/*
 * Handles any queries that should have only one row results.
 */
function query_one_result($query_stmt)
{
    $conn = get_connection();
    $results = mysqli_query($conn, $query_stmt);
    mysqli_close($conn);

    if (mysqli_num_rows($results) == 0 || mysqli_num_rows($results) > 1)
        return null;
    else
        return mysqli_fetch_assoc($results);
}

function query_one_or_more_results($query_stmt)
{
    $conn = get_connection();
    $results = mysqli_query($conn, $query_stmt);
    mysqli_close($conn);

    if (mysqli_num_rows($results) == 0)
        return null;
    else
        return $results;
}

/*
 * Executes a statement. Type is typically either 0 or 1, where 0 is an INSERT or UPDATE,
 * and 1 is DELETE. This is to determine whether a boolean value should be returned or
 * the ID of the row(s).
 */
function exec_statement($stmt, $type)
{
    $conn = get_connection();
    $results = mysqli_query($conn, $stmt);

    if ($type == 0)
        $results = mysqli_insert_id($conn);

    mysqli_close($conn);
    return $results;
}

function get_connection()
{
    // Connect to the DB
    $conn = mysqli_connect(HOST, USER, PASS, DB);

    return $conn;
}