<?php
require_once(__DIR__ . '/auth_check.php');
header('Content-Type: application/json');
require_once(__DIR__ . '/../../class/db-functions.php');

try {
    if (!isset($_GET['id']) || !is_numeric($_GET['id'])) {
        echo json_encode(['success' => false, 'message' => 'ID non valido.']);
        exit;
    }

    $id = (int)$_GET['id'];
    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    // Collect the physical files referenced by this deadline before the FK cascade removes its links
    $attStmt = $pdo->prepare("SELECT DISTINCT stored_name FROM scad_deadline_attachments WHERE deadline_id = ?");
    $attStmt->execute([$id]);
    $storedNames = $attStmt->fetchAll(PDO::FETCH_COLUMN);

    // Deleting the deadline cascades to its attachment/employee/history rows (FK ON DELETE CASCADE)
    $stmt = $pdo->prepare("DELETE FROM scad_deadlines WHERE id = ?");
    $stmt->execute([$id]);

    if ($stmt->rowCount() > 0) {
        // Unlink physical files no longer referenced by any other deadline (shared-file safe)
        if (!empty($storedNames)) {
            $refStmt = $pdo->prepare("SELECT COUNT(*) FROM scad_deadline_attachments WHERE stored_name = ?");
            foreach ($storedNames as $storedName) {
                $refStmt->execute([$storedName]);
                if ((int)$refStmt->fetchColumn() === 0) {
                    $filePath = __DIR__ . '/../attachments/' . $storedName;
                    if (file_exists($filePath)) {
                        unlink($filePath);
                    }
                }
            }
        }
        echo json_encode(['success' => true, 'message' => 'Scadenza eliminata con successo.']);
    } else {
        echo json_encode(['success' => false, 'message' => 'Scadenza non trovata.']);
    }
} catch (Exception $e) {
    echo json_encode(['success' => false, 'message' => 'Errore: ' . $e->getMessage()]);
}