키워드 순위 추적 자동화

// GSC API를 통한 키워드 순위 데이터 조회
function fetch_gsc_keyword_data($site_url, $start_date, $end_date, $access_token) {
    $api_url = 'https://www.googleapis.com/webmasters/v3/sites/' .
               urlencode($site_url) . '/searchAnalytics/query';

    $body = array(
        'startDate' => $start_date,
        'endDate' => $end_date,
        'dimensions' => array('query', 'page'),
        'rowLimit' => 5000,
        'dimensionFilterGroups' => array(
            array(
                'filters' => array(
                    array(
                        'dimension' => 'country',
                        'expression' => 'kor',  // 한국
                    ),
                ),
            ),
        ),
    );

    $response = wp_remote_post($api_url, array(
        'headers' => array(
            'Authorization' => 'Bearer ' . $access_token,
            'Content-Type' => 'application/json',
        ),
        'body' => json_encode($body),
        'timeout' => 30,
    ));

    $data = json_decode(wp_remote_retrieve_body($response), true);

    // 결과 정리
    $keywords = array();
    if (!empty($data['rows'])) {
        foreach ($data['rows'] as $row) {
            $keywords[] = array(
                'keyword' => $row['keys'][0],
                'page' => $row['keys'][1],
                'clicks' => $row['clicks'],
                'impressions' => $row['impressions'],
                'ctr' => round($row['ctr'] * 100, 2),
                'position' => round($row['position'], 1),
            );
        }
    }

    // 포지션 기준 정렬
    usort($keywords, function($a, $b) {
        return $a['position'] - $b['position'];
    });

    return $keywords;
}

// 일별 순위 변화 추적
function track_daily_rankings($site_url, $access_token) {
    $today = date('Y-m-d', strtotime('-3 days'));  // GSC는 2-3일 지연
    $yesterday = date('Y-m-d', strtotime('-4 days'));

    $today_data = fetch_gsc_keyword_data($site_url, $today, $today, $access_token);
    $yesterday_data = fetch_gsc_keyword_data($site_url, $yesterday, $yesterday, $access_token);

    // 순위 변화 계산
    $changes = array();
    $yesterday_map = array();
    foreach ($yesterday_data as $kw) {
        $yesterday_map[$kw['keyword']] = $kw['position'];
    }

    foreach ($today_data as $kw) {
        $prev_position = $yesterday_map[$kw['keyword']] ?? null;
        $change = $prev_position ? round($prev_position - $kw['position'], 1) : null;

        $changes[] = array(
            'keyword' => $kw['keyword'],
            'current_position' => $kw['position'],
            'previous_position' => $prev_position,
            'change' => $change,
            'direction' => $change > 0 ? 'up' : ($change  $kw['clicks'],
            'impressions' => $kw['impressions'],
        );
    }

    return $changes;
}