System zgłoszeń problemów (mini)

{
  "issues": [
    {
      "id": 1,
      "title": "Nie działa drukarka w pokoju 203",
      "description": "Drukarka HP nie reaguje na polecenia drukowania. Świeci się czerwona kontrolka.",
      "priority": "high",
      "status": "in_progress",
      "reporter": "Jan Kowalski",
      "created_at": "2026-02-10 09:30:00",
      "updated_at": "2026-02-10 11:00:00"
    },
    {
      "id": 2,
      "title": "Prośba o instalację programu",
      "description": "Potrzebuję Microsoft Excel na stanowisku roboczym.",
      "priority": "low",
      "status": "open",
      "reporter": "Anna Nowak",
      "created_at": "2026-02-11 14:20:00",
      "updated_at": "2026-02-11 14:20:00"
    },
    {
      "id": 3,
      "title": "Brak dostępu do sieci WiFi",
      "description": "Nie mogę połączyć się z siecią firmową. Hasło jest poprawne.",
      "priority": "high",
      "status": "closed",
      "reporter": "Piotr Wiśniewski",
      "created_at": "2026-02-09 08:15:00",
      "updated_at": "2026-02-09 16:30:00"
    }
  ]
}

$title = trim($_POST['title'] ?? '');
$description = trim($_POST['description'] ?? '');
$priority = $_POST['priority'] ?? '';
$reporter = trim($_POST['reporter'] ?? '');

if (empty($title)) {
    $errors[] = "Tytuł jest wymagany";
}

if (strlen($title) < 5) {
    $errors[] = "Tytuł musi mieć minimum 5 znaków";
}

$validPriorities = ['low', 'medium', 'high'];
if (!in_array($priority, $validPriorities)) {
    $errors[] = "Wybierz poprawny priorytet";
}

function addIssue(array &$issues, array $data): int {
    $newId = empty($issues) ? 1 : max(array_column($issues, 'id')) + 1;
    $now = date('Y-m-d H:i:s');

    $newIssue = [
        'id' => $newId,
        'title' => $data['title'],
        'description' => $data['description'] ?? '',
        'priority' => $data['priority'],
        'status' => 'open',
        'reporter' => $data['reporter'] ?? 'Anonim',
        'created_at' => $now,
        'updated_at' => $now,
    ];

    $issues[] = $newIssue;
    return $newId;
}

function changeIssueStatus(array &$issues, int $issueId, string $newStatus): bool {
    $validStatuses = ['open', 'in_progress', 'closed'];

    if (!in_array($newStatus, $validStatuses)) {
        return false;
    }

    foreach ($issues as &$issue) {
        if ($issue['id'] === $issueId) {
            $issue['status'] = $newStatus;
            $issue['updated_at'] = date('Y-m-d H:i:s');
            return true;
        }
    }

    return false;
}

// Workflow: określ dozwolone przejścia
function getNextStatus(string $currentStatus): array {
    $transitions = [
        'open' => ['in_progress', 'closed'],
        'in_progress' => ['closed', 'open'],
        'closed' => ['open'],
    ];

    return $transitions[$currentStatus] ?? [];
}

function filterIssues(array $issues, ?string $status = null, ?string $priority = null): array {
    return array_filter($issues, function($issue) use ($status, $priority) {
        if ($status !== null && $issue['status'] !== $status) {
            return false;
        }
        if ($priority !== null && $issue['priority'] !== $priority) {
            return false;
        }
        return true;
    });
}

function getPriorityInfo(string $priority): array {
    $priorities = [
        'low' => ['label' => 'Niski', 'color' => '#27ae60', 'icon' => '🟢'],
        'medium' => ['label' => 'Średni', 'color' => '#f39c12', 'icon' => '🟡'],
        'high' => ['label' => 'Wysoki', 'color' => '#e74c3c', 'icon' => '🔴'],
    ];

    return $priorities[$priority] ?? $priorities['medium'];
}

function getStatusInfo(string $status): array {
    $statuses = [
        'open' => ['label' => 'Otwarte', 'color' => '#e74c3c', 'icon' => '📬'],
        'in_progress' => ['label' => 'W realizacji', 'color' => '#f39c12', 'icon' => '⚙️'],
        'closed' => ['label' => 'Zamknięte', 'color' => '#27ae60', 'icon' => '✅'],
    ];

    return $statuses[$status] ?? $statuses['open'];
}

function getIssueStatistics(array $issues): array {
    $total = count($issues);

    // Liczba według statusu
    $byStatus = [
        'open' => 0,
        'in_progress' => 0,
        'closed' => 0,
    ];

    // Liczba według priorytetu
    $byPriority = [
        'low' => 0,
        'medium' => 0,
        'high' => 0,
    ];

    // Czas rozwiązania dla zamkniętych
    $resolutionTimes = [];

    foreach ($issues as $issue) {
        $byStatus[$issue['status']]++;
        $byPriority[$issue['priority']]++;

        if ($issue['status'] === 'closed') {
            $created = strtotime($issue['created_at']);
            $updated = strtotime($issue['updated_at']);
            $resolutionTimes[] = ($updated - $created) / 3600; // w godzinach
        }
    }

    $avgResolution = !empty($resolutionTimes)
        ? round(array_sum($resolutionTimes) / count($resolutionTimes), 1)
        : 0;

    return [
        'total' => $total,
        'by_status' => $byStatus,
        'by_priority' => $byPriority,
        'avg_resolution_hours' => $avgResolution,
    ];
}

function searchIssues(array $issues, string $query): array {
    if (empty($query)) {
        return $issues;
    }

    $queryLower = mb_strtolower($query);

    return array_filter($issues, function($issue) use ($queryLower) {
        $titleLower = mb_strtolower($issue['title']);
        $descLower = mb_strtolower($issue['description'] ?? '');

        return strpos($titleLower, $queryLower) !== false
            || strpos($descLower, $queryLower) !== false;
    });
}