<?php
/**
 * Gestione Connessione Database
 * Territory Manager
 */

require_once 'config.php';

class Database {
    private static $instance = null;
    private $connection;

    private function __construct() {
        try {
            $dsn = "mysql:host=" . DB_HOST . ";dbname=" . DB_NAME . ";charset=" . DB_CHARSET;
            $options = [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false,
            ];
            
            $this->connection = new PDO($dsn, DB_USER, DB_PASS, $options);
        } catch (PDOException $e) {
            die("Errore di connessione al database: " . $e->getMessage());
        }
    }

    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function getConnection() {
        return $this->connection;
    }

    // Metodo helper per query semplici
    public function query($sql, $params = []) {
        try {
            $stmt = $this->connection->prepare($sql);
            $stmt->execute($params);
            return $stmt;
        } catch (PDOException $e) {
            error_log("Errore query: " . $e->getMessage());
            return false;
        }
    }

    // Metodo helper per ottenere una singola riga
    public function fetchOne($sql, $params = []) {
        $stmt = $this->query($sql, $params);
        return $stmt ? $stmt->fetch() : null;
    }

    // Metodo helper per ottenere tutte le righe
    public function fetchAll($sql, $params = []) {
        $stmt = $this->query($sql, $params);
        return $stmt ? $stmt->fetchAll() : [];
    }

    // Metodo helper per ottenere valore configurazione
    public function getConfig($key, $default = null) {
        $result = $this->fetchOne(
            "SELECT config_value FROM config WHERE config_key = ?",
            [$key]
        );
        return $result ? $result['config_value'] : $default;
    }

    // Metodo helper per aggiornare configurazione
    public function updateConfig($key, $value) {
        return $this->query(
            "UPDATE config SET config_value = ? WHERE config_key = ?",
            [$value, $key]
        );
    }
}

// Funzione helper globale per ottenere il database
function getDB() {
    return Database::getInstance();
}