<?php

require_once __DIR__."/databaseCredentials.php";

// DSN (Data Source Name)
$dsn = "pgsql:host=$db_host;port=$db_port;dbname=$db_name";

try {
    // Create PDO instance
    $pdo = new PDO($dsn, $db_user, $db_password, [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
    ]);

} catch (PDOException $e) {
    echo 'Database error: ' . $e->getMessage();
}
function db_select($tblName, $cols = [], $filter = []) {
    global $pdo;
    // Defaults for fitler
    if (is_array($filter) && empty($filter)) $filter = ["true"];
    if (is_string($filter)) $filter = [$filter];

    // Execute query
    try {
      $sql_query = 'SELECT '.implode(",",$cols).' FROM "'.$tblName.'" WHERE '.implode(" AND ",$filter).';';
      $stmt = $pdo->query($sql_query);
    } catch (PDOException $e) {
      
      echo "DB QUERY ERROR: ".$e->getMessage(); die("\n\nwhile trying: $sql_query");
    }

    // Fetch and display results
    $response = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $response;

}