<?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();

    $stmt = $pdo->prepare("
        SELECT h.*,
            au.first_name as user_first_name,
            au.last_name as user_last_name
        FROM scad_deadline_histories h
        LEFT JOIN auth_users au ON au.id = h.user_id
        WHERE h.deadline_id = ?
        ORDER BY h.created_at DESC
    ");
    $stmt->execute([$id]);
    $history = $stmt->fetchAll(PDO::FETCH_ASSOC);

    // Format for display
    $actionLabels = [
        'created' => 'Creata',
        'updated' => 'Modificata',
        'completed' => 'Completata',
        'attachment_added' => 'Allegato aggiunto',
        'attachment_removed' => 'Allegato rimosso',
        'notification_sent' => 'Notifica inviata'
    ];

    foreach ($history as &$h) {
        $h['action_label'] = $actionLabels[$h['action']] ?? $h['action'];
        $h['user_name'] = trim(($h['user_first_name'] ?? '') . ' ' . ($h['user_last_name'] ?? '')) ?: 'Sistema';
        $h['changes'] = $h['changes'] ? json_decode($h['changes'], true) : null;
        unset($h['user_first_name'], $h['user_last_name']);
    }

    echo json_encode(['success' => true, 'data' => $history]);

} catch (Exception $e) {
    echo json_encode(['success' => false, 'message' => 'Errore: ' . $e->getMessage()]);
}