<?php
declare(strict_types=1);

require_once dirname(dirname(__DIR__)) . '/bootstrap.php';

function task_cert_user_overdue_widget_action(): array
{
    $auth = TaskCertAuthContext::fromGlobals();
    if (!$auth->isLoggedIn()) {
        return [
            'error' => 'Nicht eingeloggt.',
            'assignments' => [],
            'has_more' => false,
            'total_count' => 0,
            'limit' => 0,
        ];
    }

    $limit = max(1, min(50, TaskCertRequest::queryInt('limit', 8)));
    $services = task_cert_services();
    $assignments = $services['assignmentRepo']->listForUser($auth->contactId());
    $now = new DateTimeImmutable();

    $attentionAssignments = [];
    foreach ($assignments as $assignment) {
        $status = (string) ($assignment['status'] ?? '');
        if (in_array($status, ['completed', 'expired'], true)) {
            continue;
        }

        $isEscalated = (int) ($assignment['escalation_level'] ?? 0) > 0;
        $isOverdueStatus = $status === 'overdue';

        $isOverdueByDate = false;
        $dueAtRaw = trim((string) ($assignment['due_at'] ?? ''));
        if ($dueAtRaw !== '') {
            try {
                $isOverdueByDate = (new DateTimeImmutable($dueAtRaw)) < $now;
            } catch (Throwable $throwable) {
                $isOverdueByDate = false;
            }
        }

        if (!$isEscalated && !$isOverdueStatus && !$isOverdueByDate) {
            continue;
        }

        $assignment['is_escalated'] = $isEscalated ? 1 : 0;
        $assignment['is_overdue_by_date'] = $isOverdueByDate ? 1 : 0;
        $attentionAssignments[] = $assignment;
    }

    usort($attentionAssignments, static function (array $left, array $right): int {
        $leftEscalation = (int) ($left['escalation_level'] ?? 0);
        $rightEscalation = (int) ($right['escalation_level'] ?? 0);
        if ($leftEscalation !== $rightEscalation) {
            return $rightEscalation <=> $leftEscalation;
        }

        $leftOverdue = (int) ($left['is_overdue_by_date'] ?? 0);
        $rightOverdue = (int) ($right['is_overdue_by_date'] ?? 0);
        if ($leftOverdue !== $rightOverdue) {
            return $rightOverdue <=> $leftOverdue;
        }

        $leftDue = trim((string) ($left['due_at'] ?? ''));
        $rightDue = trim((string) ($right['due_at'] ?? ''));
        if ($leftDue === '' && $rightDue !== '') {
            return 1;
        }
        if ($leftDue !== '' && $rightDue === '') {
            return -1;
        }
        if ($leftDue !== '' && $rightDue !== '' && $leftDue !== $rightDue) {
            return strcmp($leftDue, $rightDue);
        }

        return ((int) ($right['id'] ?? 0)) <=> ((int) ($left['id'] ?? 0));
    });

    $totalCount = count($attentionAssignments);
    $hasMore = $totalCount > $limit;
    if ($hasMore) {
        $attentionAssignments = array_slice($attentionAssignments, 0, $limit);
    }

    return [
        'error' => null,
        'assignments' => $attentionAssignments,
        'has_more' => $hasMore,
        'total_count' => $totalCount,
        'limit' => $limit,
    ];
}