if (!function_exists('debug_log')) {
    function debug_log($msg) {
        if (defined('APP_DEBUG') && APP_DEBUG) {
            error_log($msg);
        }
    }
}

// FANZA API連携クラス

class FanzaAPI {
    private $api_id;
    private $affiliate_id;
    private $api_url = 'https://api.dmm.com/affiliate/v3/ItemList';
    
    public function __construct($api_id, $affiliate_id) {
        $this->api_id = $api_id;
        $this->affiliate_id = $affiliate_id;
        
        // APIキーが空の場合の警告
        if (empty($api_id) || empty($affiliate_id)) {
            debug_log('[FANZA API] Warning: APIキーが設定されていません - API ID: ' . (!empty($api_id) ? '設定あり' : '空') . ', Affiliate ID: ' . (!empty($affiliate_id) ? '設定あり' : '空'));
        }
    }
    
    // 同人商品検索
    public function searchDoujinItems($params = [], $page = 1, $hits = 30) {
        // 文字列が渡された場合（後方互換性）
        if (is_string($params)) {
            $keyword = $params;
            $params = ['keyword' => $keyword];
        }
        
        // ページ番号と件数を設定（1ページ目の場合はoffsetを設定しない）
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $hits;
        }
        // 初回取得を軽量化（安定性向上のため50件以内）
        $params['hits'] = min(50, max(1, (int)$hits));
        
        // APIキー未設定時は空を返す（サンプルは返さない）
        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキー未設定: doujin search は空結果');
            return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
        }
        
        $cache_key = 'fanza_doujin_search_' . md5(json_encode($params) . '_' . $page . '_' . $hits);
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        // 試行候補を用意（安定性重視で service=doujin を先に試す）
        $candidates = [];
        $base = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'hits' => $hits,
            'sort' => 'date',
            'output' => 'json'
        ];
        $params_sort = $params['sort'] ?? 'date';
        // ソートの正規化
        if (!in_array($params_sort, ['release','-release','date','-date','price','-price','review','-review'], true)) {
            $params_sort = 'date';
        }
        // 1) service=doujin（floorなし）
        $c1 = array_merge($base, $params, ['service' => 'doujin', 'sort' => $params_sort]);
        unset($c1['floor']);
        $candidates[] = $c1;
        // 2) service=digital + floor=digital_doujin
        $c2 = array_merge($base, $params, ['service' => 'digital', 'sort' => $params_sort, 'floor' => 'digital_doujin']);
        $candidates[] = $c2;
        // 3) service=doujin + site=DMM.com（環境によって成功する場合あり）
        $c3 = $c1; $c3['site'] = 'DMM.com';
        $candidates[] = $c3;

        foreach ($candidates as $i => $req) {
            $url = $this->api_url . '?' . http_build_query($req);
            $resp = $this->callAPI($url);
            if ($resp && isset($resp['result']) && !empty($resp['result']['items'])) {
                set_cache($cache_key, $resp['result']);
                return $resp['result'];
            }
        }
        // 失敗時は空
        debug_log('[FANZA API] 同人商品検索API: 全候補で0件/失敗 - params: ' . json_encode($params));
        return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
    }
    
    // 同人商品サンプルデータ生成
    private function getSampleDoujinItems($params) {
        $kw = trim($params['keyword'] ?? '');
        $sample_items = [
            [
                'content_id' => 'd_doujin001',
                'title' => 'サンプル同人作品 1 - エロ漫画集 NTR 巨乳',
                'imageURL' => [
                    'small' => 'https://via.placeholder.com/200x280/ff9800/ffffff?text=Sample+1',
                    'large' => 'https://via.placeholder.com/400x560/ff9800/ffffff?text=Sample+1'
                ],
                'affiliateURL' => '#',
                'date' => date('Y-m-d'),
                'volume' => '30ページ',
                'comment' => 'これはサンプル同人作品の説明文です。実際のFANZA APIが動作すると、本物の商品データが表示されます。',
                'iteminfo' => [
                    'genre' => [['name' => 'NTR', 'id' => '1'], ['name' => 'おねショタ', 'id' => '2']],
                    'maker' => [['name' => 'サンプルサークル', 'id' => '1']],
                    'author' => [['name' => 'サンプル作者', 'id' => '1']]
                ],
                'prices' => ['price' => 550]
            ],
            [
                'content_id' => 'd_doujin002',
                'title' => 'サンプル同人作品 2 - CG集 3DCG 制服',
                'imageURL' => [
                    'small' => 'https://via.placeholder.com/200x280/e65100/ffffff?text=Sample+2',
                    'large' => 'https://via.placeholder.com/400x560/e65100/ffffff?text=Sample+2'
                ],
                'affiliateURL' => '#',
                'date' => date('Y-m-d', strtotime('-1 day')),
                'volume' => '50枚',
                'comment' => '高品質なCG集のサンプルです。FANZA APIが正常動作すると実際の商品が表示されます。',
                'iteminfo' => [
                    'genre' => [['name' => '快楽堕ち', 'id' => '3'], ['name' => '3DCG', 'id' => '4']],
                    'maker' => [['name' => 'テストサークル', 'id' => '2']],
                    'author' => [['name' => 'テスト作者', 'id' => '2']]
                ],
                'prices' => ['price' => 770]
            ]
        ];
        
        // キーワード簡易フィルタ（タイトル・ジャンル・サークル・作者）
        if ($kw !== '') {
            $filtered = array_filter($sample_items, function($it) use ($kw){
                if (stripos($it['title'] ?? '', $kw) !== false) return true;
                foreach (['genre','maker','author'] as $k) {
                    if (!empty($it['iteminfo'][$k]) && is_array($it['iteminfo'][$k])) {
                        foreach ($it['iteminfo'][$k] as $e) {
                            if (!empty($e['name']) && stripos($e['name'], $kw) !== false) return true;
                        }
                    }
                }
                return false;
            });
            if (!empty($filtered)) $sample_items = array_values($filtered);
        }

        return [
            'result_count' => count($sample_items),
            'total_count' => count($sample_items),
            'first_position' => 1,
            'items' => $sample_items
        ];
    }
    
    // APIキーが設定されているかチェック
    private function isAPIKeySet() {
        return !empty($this->api_id) && !empty($this->affiliate_id);
    }
    
   // 商品検索
public function searchItems($params = [], $page = 1, $hits = 30) {
    if (is_string($params)) {
        $params = ['keyword' => $params];
    }

    if ($page > 1) {
        $params['offset'] = (($page - 1) * $hits) + 1;
    }

    $params['hits'] = min(100, max(1, (int)$hits));

    if (!$this->isAPIKeySet()) {
        debug_log('[FANZA API] APIキー未設定: search items は空結果');
        return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
    }

    $cache_key = 'fanza_search_' . md5(json_encode($params) . '_' . $page . '_' . $hits);
    $cached_data = get_cache($cache_key);

    if ($cached_data !== false) {
        return $cached_data;
    }

    $sort = $params['sort'] ?? 'date';
    switch ($sort) {
        case 'rank':
        case 'popular':
            $sort = 'date';
            break;
    }

    // start は使わず offset に統一
    unset($params['start']);

    $base = [
        'api_id' => $this->api_id,
        'affiliate_id' => $this->affiliate_id,
        'hits' => min(100, max(1, (int)$hits)),
        'sort' => $sort,
        'output' => 'json'
    ];

    // 複数候補を試す
    $candidates = [];

    // FANZA / videoa
    $candidates[] = array_merge($base, $params, [
        'site' => 'FANZA',
        'service' => 'digital',
        'floor' => 'videoa'
    ]);

    // DMM.com / videoa
    $candidates[] = array_merge($base, $params, [
        'site' => 'DMM.com',
        'service' => 'digital',
        'floor' => 'videoa'
    ]);

    // FANZA / video
    $candidates[] = array_merge($base, $params, [
        'site' => 'FANZA',
        'service' => 'digital',
        'floor' => 'video'
    ]);

    // DMM.com / video
    $candidates[] = array_merge($base, $params, [
        'site' => 'DMM.com',
        'service' => 'digital',
        'floor' => 'video'
    ]);

    foreach ($candidates as $req) {
        $url = $this->api_url . '?' . http_build_query($req);
        $response = $this->callAPI($url);

        if ($response && isset($response['result']) && !empty($response['result']['items'])) {
            if (!empty($params['hybrid'])) {
                $response['result'] = $this->applyHybridFiltering($response['result'], $params['hits'] ?? 30);
            }
            set_cache($cache_key, $response['result']);
            return $response['result'];
        }
    }

    error_log('[FANZA API] 商品検索API呼び出しに失敗、空結果 - params: ' . json_encode($params, JSON_UNESCAPED_UNICODE));
    return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
}

    // 通販（物販）検索（FANZA mono）
    public function searchTsuhanItems($params = [], $page = 1, $hits = 30) {
        // 文字列が来たらキーワードとして扱う
        if (is_string($params)) {
            $params = ['keyword' => $params];
        }
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $hits;
        }
        $params['hits'] = min(100, max(1, (int)$hits));

        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキー未設定: tsuhan は空結果');
            return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
        }

        $cache_key = 'fanza_tsuhan_' . md5(json_encode($params) . '_' . $page . '_' . $hits);
        $cached = get_cache($cache_key);
        if ($cached !== false) return $cached;

        // デフォルトパラメータ（mono=物販）
        $default = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'service' => 'mono',
            'hits' => min(100, max(1, (int)$hits)),
            'sort' => 'date',
            'output' => 'json'
        ];
        $request = array_merge($default, $params);
        // ソートパラメータ調整
        if (isset($request['sort'])) {
            switch ($request['sort']) {
                case 'release':
                    $request['sort'] = '-date';
                    break;
                case 'date':
                default:
                    $request['sort'] = 'date';
                    break;
            }
        }

        $url = $this->api_url . '?' . http_build_query($request);
        $resp = $this->callAPI($url);
        if ($resp && isset($resp['result']) && !empty($resp['result']['items'])) {
            set_cache($cache_key, $resp['result'], 1800);
            return $resp['result'];
        }
        // Fallback: DMM.com サイトで再試行
        $request['site'] = 'DMM.com';
        $url2 = $this->api_url . '?' . http_build_query($request);
        $resp2 = $this->callAPI($url2);
        if ($resp2 && isset($resp2['result']) && !empty($resp2['result']['items'])) {
            set_cache($cache_key, $resp2['result'], 1800);
            return $resp2['result'];
        }
        debug_log('[FANZA API] 通販API失敗、空結果');
        return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
    }

    // 月額（見放題）検索（FANZA monthly）
    public function searchMonthlyItems($params = [], $page = 1, $hits = 30) {
        if (is_string($params)) { $params = ['keyword' => $params]; }
        if ($page > 1) { $params['offset'] = ($page - 1) * $hits; }
        $params['hits'] = min(100, max(1, (int)$hits));

        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキー未設定: monthly は空結果');
            return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
        }

        $cache_key = 'fanza_monthly_' . md5(json_encode($params) . '_' . $page . '_' . $hits);
        $cached = get_cache($cache_key);
        if ($cached !== false) return $cached;

        $default = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'service' => 'monthly',
            'hits' => min(100, max(1, (int)$hits)),
            'sort' => 'date',
            'output' => 'json'
        ];
        $request = array_merge($default, $params);
        // ソート調整
        if (isset($request['sort'])) {
            switch ($request['sort']) {
                case 'release': $request['sort'] = '-date'; break;
                case 'date':
                default: $request['sort'] = 'date'; break;
            }
        }

        $url = $this->api_url . '?' . http_build_query($request);
        $resp = $this->callAPI($url);
        if ($resp && isset($resp['result']) && !empty($resp['result']['items'])) {
            set_cache($cache_key, $resp['result']);
            return $resp['result'];
        }
        // Fallback DMM.com
        $request['site'] = 'DMM.com';
        $url2 = $this->api_url . '?' . http_build_query($request);
        $resp2 = $this->callAPI($url2);
        if ($resp2 && isset($resp2['result']) && !empty($resp2['result']['items'])) {
            set_cache($cache_key, $resp2['result']);
            return $resp2['result'];
        }
        debug_log('[FANZA API] 月額API失敗、空結果');
        return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
    }

    // 通販サンプルデータ
    private function getSampleTsuhanItems($params = []) {
        $items = [];
        for ($i=1; $i<=12; $i++) {
            $items[] = [
                'content_id' => 't_sample'.str_pad($i,2,'0',STR_PAD_LEFT),
                'title' => '通販サンプル商品 '.$i,
                'date' => date('Y-m-d', strtotime('-'.rand(0,10).' days')),
                'imageURL' => [
                    'small' => 'https://via.placeholder.com/240x240/ffb74d/ffffff?text=T'.$i,
                    'large' => 'https://via.placeholder.com/600x600/ff9800/ffffff?text=T'.$i
                ],
                'affiliateURL' => '#',
                'iteminfo' => [
                    'maker' => [['name' => 'サンプルストア']],
                ],
                'prices' => ['price' => rand(1000,5000)]
            ];
        }
        return [
            'items' => $items,
            'total_count' => count($items),
            'first_position' => 1
        ];
    }
    
    /**
     * ハイブリッドフィルタリング
     * 動画ありを優先、少ない場合は画像のみも追加
     */
    private function applyHybridFiltering($result, $requested_hits = 30) {
        if (!isset($result['items']) || empty($result['items'])) {
            return $result;
        }
        
        $items = $result['items'];
        
        // 動画あり・なしで分類
        $items_with_video = [];
        $items_without_video = [];
        
        foreach ($items as $item) {
            if (!empty($item['sampleMovieURL']) && is_array($item['sampleMovieURL'])) {
                // size_で始まるキーがあるかチェック
                $has_movie = false;
                foreach ($item['sampleMovieURL'] as $key => $value) {
                    if (strpos($key, 'size_') === 0 && !empty($value)) {
                        $has_movie = true;
                        break;
                    }
                }
                
                if ($has_movie) {
                    $items_with_video[] = $item;
                } else {
                    $items_without_video[] = $item;
                }
            } else {
                $items_without_video[] = $item;
            }
        }
        
        // ハイブリッド処理
        $final_items = $items_with_video;
        
        // 動画ありが要求数の半分未満の場合、画像のみも追加
        if (count($items_with_video) < $requested_hits / 2) {
            $needed = $requested_hits - count($items_with_video);
            $additional = array_slice($items_without_video, 0, $needed);
            $final_items = array_merge($final_items, $additional);
        }
        
        // 要求数に調整
        $final_items = array_slice($final_items, 0, $requested_hits);
        
        // 結果を更新
        $result['items'] = $final_items;
        $result['total_count_with_video'] = count($items_with_video);
        $result['total_count_without_video'] = count($items_without_video);
        
        return $result;
    }
    
// 商品詳細取得
public function getItemDetail($content_id, $service = 'digital') {


    if (!$this->isAPIKeySet()) {
        debug_log('[FANZA API] APIキー未設定');
        return null;
    }

    $content_id = trim((string)$content_id);
    if ($content_id === '') {
        return null;
    }

$is_doujin = (strpos($content_id, 'd_') === 0);

if ($is_doujin) {
    $patterns = [
        ['site' => 'FANZA',   'service' => 'doujin'],
        ['site' => 'DMM.com', 'service' => 'doujin'],
    ];
} else {
    // h_ / n_ もまずは動画として試す
    $patterns = [
        ['site' => 'FANZA',   'service' => 'digital', 'floor' => 'videoa'],
        ['site' => 'DMM.com', 'service' => 'digital', 'floor' => 'videoa'],
        ['site' => 'FANZA',   'service' => 'digital', 'floor' => 'video'],
        ['site' => 'DMM.com', 'service' => 'digital', 'floor' => 'video'],
        ['site' => 'FANZA',   'service' => 'digital', 'floor' => 'amateur'],
        ['site' => 'FANZA',   'service' => 'mono'],
        ['site' => 'DMM.com', 'service' => 'mono'],
    ];
}

    foreach ($patterns as $p) {
        // ① まず cid 直指定で試す
        $params = [
            'api_id'       => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site'         => $p['site'],
            'service'      => $p['service'],
            'cid'          => $content_id,
            'hits'         => 10,
            'output'       => 'json',
        ];

        if (!empty($p['floor'])) {
            $params['floor'] = $p['floor'];
        }

        $url = 'https://api.dmm.com/affiliate/v3/ItemList?' . http_build_query($params);

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 20,
            CURLOPT_CONNECTTIMEOUT => 10,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_USERAGENT => 'Mozilla/5.0',
        ]);

        $json = curl_exec($ch);
        $errno = curl_errno($ch);
        $httpCode = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if (!$errno && $httpCode === 200 && $json) {
            $data = json_decode($json, true);
            if (is_array($data) && !empty($data['result']['items']) && is_array($data['result']['items'])) {
                foreach ($data['result']['items'] as $candidate) {
                    $candidate_id = (string)($candidate['content_id'] ?? '');
                    if (strcasecmp($candidate_id, $content_id) === 0) {
                        return $candidate;
                    }
                }
            }
        }

// ② cid で取れなければ keyword 検索で exact 一致を拾う
// ただし mono / doujin は keyword 検索しない
if ($is_mono || $is_doujin) {
    continue;
}

$params = [
    'api_id'       => $this->api_id,
    'affiliate_id' => $this->affiliate_id,
    'site'         => $p['site'],
    'service'      => $p['service'],
    'keyword'      => $content_id,
    'hits'         => 20,
    'output'       => 'json',
];

if (!empty($p['floor'])) {
    $params['floor'] = $p['floor'];
}

        $url = 'https://api.dmm.com/affiliate/v3/ItemList?' . http_build_query($params);

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 20,
            CURLOPT_CONNECTTIMEOUT => 10,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_USERAGENT => 'Mozilla/5.0',
        ]);

        $json = curl_exec($ch);
        $errno = curl_errno($ch);
        $httpCode = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($errno || $httpCode !== 200 || !$json) {
            continue;
        }

        $data = json_decode($json, true);
        if (!is_array($data) || empty($data['result']['items']) || !is_array($data['result']['items'])) {
            continue;
        }

        foreach ($data['result']['items'] as $candidate) {
            $candidate_id = (string)($candidate['content_id'] ?? '');
            $product_id   = (string)($candidate['product_id'] ?? '');

            if (
                strcasecmp($candidate_id, $content_id) === 0 ||
                strcasecmp($product_id, $content_id) === 0
            ) {
                return $candidate;
            }
        }
    }

    return null;
}
 
    // フロア一覧取得
    public function getFloors() {
        // APIキーが設定されていない場合はサンプルデータを返す
        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキーが未設定のためフロアサンプルデータを返します');
            return $this->getSampleFloors();
        }
        
        $cache_key = 'fanza_floors';
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $floor_url = 'https://api.dmm.com/affiliate/v3/FloorList';
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'output' => 'json'
        ];
        
        $url = $floor_url . '?' . http_build_query($params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result'])) {
            set_cache($cache_key, $response['result'], 86400); // 24時間キャッシュ
            return $response['result'];
        }
        
        // API呼び出しが失敗した場合もサンプルデータを返す
        debug_log('[FANZA API] Floor API呼び出しに失敗、サンプルデータを返します');
        return $this->getSampleFloors();
    }

    // ジャンル一覧取得
    public function getGenres() {
        $cache_key = 'fanza_genres';
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $genre_url = 'https://api.dmm.com/affiliate/v3/GenreSearch';
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43',
            'output' => 'json'
        ];
        
        $url = $genre_url . '?' . http_build_query($params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result'])) {
            set_cache($cache_key, $response['result'], 86400); // 24時間キャッシュ
            return $response['result'];
        }
        
        return [];
    }
    
    // 女優一覧取得
    public function getActresses($params = []) {
        // APIキーが設定されていない場合はサンプルデータを返す
        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキーが未設定のため女優サンプルデータを返します');
            return $this->getSampleActresses();
        }
        
        $cache_key = 'fanza_actresses_' . md5(json_encode($params));
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $actress_url = 'https://api.dmm.com/affiliate/v3/ActressSearch';
        $default_params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'hits' => 100,
            'output' => 'json'
        ];
        
        $request_params = array_merge($default_params, $params);
        $url = $actress_url . '?' . http_build_query($request_params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result'])) {
            set_cache($cache_key, $response['result'], 86400); // 24時間キャッシュ
            return $response['result'];
        }
        
        // 失敗時は空
        debug_log('[FANZA API] 女優API呼び出しに失敗、空を返します');
        return [];
    }
    
    // メーカー一覧取得
    public function getMakers($params = []) {
        // APIキーが設定されていない場合はサンプルデータを返す
        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキーが未設定のためメーカーサンプルデータを返します');
            return $this->getSampleMakers();
        }
        
        $cache_key = 'fanza_makers_' . md5(json_encode($params));
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $maker_url = 'https://api.dmm.com/affiliate/v3/MakerSearch';
        $default_params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43',
            'hits' => 500,
            'output' => 'json'
        ];
        
        $request_params = array_merge($default_params, $params);
        $url = $maker_url . '?' . http_build_query($request_params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result'])) {
            set_cache($cache_key, $response['result'], 86400); // 24時間キャッシュ
            return $response['result'];
        }
        
        // 失敗時は空
        debug_log('[FANZA API] メーカーAPI呼び出しに失敗、空を返します');
        return [];
    }
    
    // API呼び出し共通処理（file_get_contents版 - cURL不要）
    private function callAPI($url) {
        $attempts = 0; $response = false; $http = 0;
        do {
            $attempts++;
            // 1) cURLが使えるなら優先（ホスティング環境の制限回避）
            if (function_exists('curl_init')) {
                $ch = curl_init();
                curl_setopt($ch, CURLOPT_URL, $url);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($ch, CURLOPT_TIMEOUT, 30);
                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
                curl_setopt($ch, CURLOPT_HTTPHEADER, [
                    'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
                    'Accept-Charset: UTF-8'
                ]);
                $response = curl_exec($ch);
                $http = curl_getinfo($ch, CURLINFO_HTTP_CODE);
                curl_close($ch);
                if ($response === false || $http >= 400) {
                    // HTTPエラーの可視化（調査用）
                    if ($http >= 400) {
                        debug_log('[FANZA API] HTTP error ' . $http . ' - URL: ' . $url);
                    } else {
                        error_log('[FANZA API] cURL error - no response - URL: ' . $url);
                    }
                    $response = false;
                }
            } else {
                // 2) cURLが無ければ file_get_contents
                $context = stream_context_create([
                    'http' => [
                        'timeout' => 30,
                        'method' => 'GET',
                        'header' => [
                            'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
                            'Accept-Charset: UTF-8'
                        ]
                    ],
                    'ssl' => [
                        'verify_peer' => false,
                        'verify_peer_name' => false
                    ]
                ]);
                $response = @file_get_contents($url, false, $context);
            }
            if ($response === false && $attempts < 2) { usleep(200000); }
        } while ($response === false && $attempts < 2);

        if ($response !== false && is_string($response)) {
            // BOMを除去（もし存在する場合）
            $response = preg_replace('/^\xEF\xBB\xBF/', '', $response);
            
            $data = json_decode($response, true);
            if (json_last_error() === JSON_ERROR_NONE) {
                // エラーレスポンスかチェック
                if (isset($data['result']['status']) && $data['result']['status'] == 400) {
                    derror_log('[FANZA API] API Error 400: ' . json_encode($data['result'], JSON_UNESCAPED_UNICODE));
                    return null;
                }
                
                // 正常レスポンスの場合
                // debug_log('[FANZA API] Success - URL: ' . $url);
                if (isset($data['result'])) {
                    // debug_log('[FANZA API] Result keys: ' . implode(', ', array_keys($data['result'])));
                }
                
                // キャッシュ処理なし（searchItemsで処理）
                
                return $data;
            } else {
                // error_log('[FANZA API] JSON Parse Error: ' . json_last_error_msg());
                // debug_log('[FANZA API] Response (first 500 chars): ' . substr($response, 0, 500));
            }
        } else {
            // HTTP エラーの詳細（file_get_contents系）
            $error = error_get_last();
            if (!empty($error['message'])) {
                error_log('[FANZA API] HTTP request error - ' . $error['message'] . ' - URL: ' . $url);
            } else {
                debug_log('[FANZA API] HTTP request error (unknown) - URL: ' . $url);
            }
            // debug_log('[FANZA API] API Error - URL: ' . $url);
            // debug_log('[FANZA API] HTTP Error: ' . ($error['message'] ?? 'Unknown error'));
        }
        
        return null;
    }
    
    // 新着商品取得
    public function getNewItems($page = 1, $hits = 30) {
        return $this->searchItems([
            'sort' => 'date',
            'hits' => $hits,
            'start' => ($page - 1) * $hits
        ]);
    }
    
    // 人気商品取得
    public function getPopularItems($page = 1, $hits = 30) {
        return $this->searchItems([
            'sort' => 'rank',
            'hits' => $hits,
            'start' => ($page - 1) * $hits
        ]);
    }
    
    // 期間別人気商品取得
    public function getPopularItemsByPeriod($period = 'monthly', $page = 1, $hits = 30) {
        if (!$this->isAPIKeySet()) {
            return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
        }
        // キャッシュキー
        $cache_key = 'fanza_popular_' . $period . '_' . $page . '_' . $hits;
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        // APIパラメータ
        $url = 'https://api.dmm.com/affiliate/v3/ItemList';
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'service' => 'digital',
            'floor' => 'videoa',
            'hits' => $hits,
            'sort' => 'rank',
            'output' => 'json'
        ];
        
        // 1ページ目以外の場合のみoffsetを設定
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $hits;
        }
        
        // 期間別ランキングのargumentパラメータを追加
        switch ($period) {
            case 'daily':
                $params['argument'] = 'daily';
                break;
            case 'weekly':
                $params['argument'] = 'weekly';
                break;
            case 'monthly':
                $params['argument'] = 'monthly';
                break;
            case 'yearly':
                $params['argument'] = 'yearly';
                break;
            case 'all':
                // 全期間の場合はargumentを指定しない
                break;
            default:
                $params['argument'] = 'monthly';
                break;
        }
        
        $request_url = $url . '?' . http_build_query($params);
        
        // デバッグログ
        // debug_log('[FANZA API] Popular items request - Period: ' . $period . ', URL: ' . $request_url);
        
        $response = $this->callAPI($request_url);
        
        if ($response && isset($response['result'])) {
            set_cache($cache_key, $response['result'], 3600); // 1時間キャッシュ
            return $response['result'];
        }
        
        // フォールバックしない
        return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
    }

    /**
     * 汎用: サービス別の期間人気商品取得
     * @param string $service 'digital' | 'doujin' | 'mono'
     * @param string $period  'daily' | 'weekly' | 'monthly' | 'yearly' | 'all'
     * @param int    $page
     * @param int    $hits
     * @param array  $extra  追加のAPIパラメータ（例: floor）
     */
    public function getPopularItemsByPeriodGeneric($service = 'digital', $period = 'monthly', $page = 1, $hits = 30, $extra = []) {
        if (!$this->isAPIKeySet()) {
            return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
        }
        $cache_key = 'fanza_popular_generic_' . $service . '_' . $period . '_' . $page . '_' . $hits . '_' . md5(json_encode($extra));
        $cached = get_cache($cache_key);
        if ($cached !== false) return $cached;

        $url = 'https://api.dmm.com/affiliate/v3/ItemList';
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'service' => $service,
            'hits' => min(100, max(1, (int)$hits)),
            'sort' => 'rank',
            'output' => 'json'
        ];
        // 同人は digital+digital_doujin を第一候補に
        $isDoujin = ($service === 'doujin');
        if ($isDoujin) {
            $params['service'] = 'digital';
            if (empty($extra['floor'])) $extra['floor'] = 'digital_doujin';
        }
        // 追加パラメータ（floorなど）
        if (is_array($extra)) {
            foreach ($extra as $k => $v) {
                if ($v !== '' && $v !== null) $params[$k] = $v;
            }
        }
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $hits;
        }
        switch ($period) {
            case 'daily':   $params['argument'] = 'daily'; break;
            case 'weekly':  $params['argument'] = 'weekly'; break;
            case 'monthly': $params['argument'] = 'monthly'; break;
            case 'yearly':  $params['argument'] = 'yearly'; break;
            case 'all':     /* 全期間: argumentなし */ break;
            default:        $params['argument'] = 'monthly'; break;
        }

        $request_url = $url . '?' . http_build_query($params);
        $resp = $this->callAPI($request_url);
        if ($resp && isset($resp['result']) && !empty($resp['result']['items'])) {
            set_cache($cache_key, $resp['result'], 3600);
            return $resp['result'];
        }
        // フォールバック: 同人は service=doujin でも試す
        if ($isDoujin) {
            $params_fb = $params;
            unset($params_fb['floor']);
            $params_fb['service'] = 'doujin';
            $request_url_fb = $url . '?' . http_build_query($params_fb);
            $resp_fb = $this->callAPI($request_url_fb);
            if ($resp_fb && isset($resp_fb['result']) && !empty($resp_fb['result']['items'])) {
                set_cache($cache_key, $resp_fb['result'], 3600);
                return $resp_fb['result'];
            }
        }
        // mono の場合、DMM.comにフォールバック
        if ($service === 'mono') {
            $params['site'] = 'DMM.com';
            $request_url2 = $url . '?' . http_build_query($params);
            $resp2 = $this->callAPI($request_url2);
            if ($resp2 && isset($resp2['result']) && !empty($resp2['result']['items'])) {
                set_cache($cache_key, $resp2['result'], 3600);
                return $resp2['result'];
            }
        }
        // フォールバックしない
        return ['items'=>[], 'total_count'=>0, 'first_position'=>1];
    }
    
    // 評価順商品取得
    public function getHighRatedItems($page = 1, $hits = 30) {
        return $this->searchItems([
            'sort' => 'review',
            'hits' => $hits,
            'start' => ($page - 1) * $hits
        ]);
    }
    
    // キーワード検索
    public function searchByKeyword($keyword, $page = 1, $hits = 30, $sort = 'date') {
        // FANZA APIのソートパラメータをそのまま使用
        return $this->searchItems([
            'keyword' => $keyword,
            'hits' => $hits,
            'sort' => $sort
        ], $page, $hits);
    }
    
    // ジャンル検索
    public function searchByGenre($genre_id, $page = 1, $hits = 30, $sort = 'date') {
        return $this->searchItems([
            'genre_id' => $genre_id,
            'hits' => $hits,
            'sort' => $sort
        ], $page, $hits);
    }
    
    // 女優検索
    public function searchByActress($actress_id, $page = 1, $hits = 30, $sort = 'date') {
        return $this->searchItems([
            'actress_id' => $actress_id,
            'hits' => $hits,
            'sort' => $sort
        ], $page, $hits);
    }
    
    // メーカー検索
    public function searchByMaker($maker_id, $page = 1, $hits = 30, $sort = 'date') {
        return $this->searchItems([
            'maker_id' => $maker_id,
            'hits' => $hits,
            'sort' => $sort
        ], $page, $hits);
    }
    
    // シリーズ検索
    public function searchBySeries($series_id, $page = 1, $hits = 30, $sort = 'date') {
        return $this->searchItems([
            'series_id' => $series_id,
            'hits' => $hits,
            'sort' => $sort
        ], $page, $hits);
    }
    
    // レーベル検索
    public function searchByLabel($label_id, $page = 1, $hits = 30) {
        return $this->searchItems([
            'label_id' => $label_id,
            'hits' => $hits,
            'start' => ($page - 1) * $hits
        ]);
    }
    
    // 人気キーワード取得
    public function getPopularKeywords($period = 'daily') {
        $cache_key = 'fanza_keywords_' . $period;
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        // キーワードランキングは商品検索から頻出キーワードを抽出
        // FANZA APIには直接的なキーワードランキングAPIがないため
        
        // 期間パラメータ
        $period_map = [
            'daily' => 'day',
            'weekly' => 'week', 
            'monthly' => 'month',
            'yearly' => 'year',
            'all' => 'all'
        ];
        
        // 期間別のダミーキーワードデータを返す
        $keywords_data = [
            'daily' => [
                ['keyword' => '巨乳 OL', 'count' => 1523, 'point' => 2890],
                ['keyword' => '人妻 不倫', 'count' => 1422, 'point' => 2688],
                ['keyword' => '素人 ナンパ', 'count' => 1390, 'point' => 2488],
                ['keyword' => '制服 JK', 'count' => 1288, 'point' => 2366],
                ['keyword' => '中出し 素人', 'count' => 1188, 'point' => 2188]
            ],
            'weekly' => [
                ['keyword' => '熟女 中出し', 'count' => 8522, 'point' => 15688],
                ['keyword' => 'NTR 人妻', 'count' => 7990, 'point' => 14488],
                ['keyword' => '痴漢 電車', 'count' => 7588, 'point' => 13988],
                ['keyword' => 'レイプ 輪姦', 'count' => 6988, 'point' => 12788],
                ['keyword' => 'OL 巨乳', 'count' => 6788, 'point' => 12188]
            ],
            'monthly' => [
                ['keyword' => '素人 個人撮影', 'count' => 35220, 'point' => 68880],
                ['keyword' => '人妻 寝取られ', 'count' => 32990, 'point' => 64488],
                ['keyword' => 'JK 制服', 'count' => 30588, 'point' => 59988],
                ['keyword' => '巨乳 パイズリ', 'count' => 28988, 'point' => 56788],
                ['keyword' => 'ギャル 中出し', 'count' => 26788, 'point' => 52188]
            ],
            'yearly' => [
                ['keyword' => '熟女', 'count' => 422220, 'point' => 826880],
                ['keyword' => '巨乳', 'count' => 392990, 'point' => 784488],
                ['keyword' => '人妻', 'count' => 365880, 'point' => 719988],
                ['keyword' => '素人', 'count' => 348980, 'point' => 676788],
                ['keyword' => '中出し', 'count' => 326780, 'point' => 632188]
            ],
            'all' => [
                ['keyword' => '巨乳', 'count' => 1822220, 'point' => 3626880],
                ['keyword' => '熟女', 'count' => 1692990, 'point' => 3384488],
                ['keyword' => '素人', 'count' => 1565880, 'point' => 3119988],
                ['keyword' => '人妻', 'count' => 1448980, 'point' => 2876788],
                ['keyword' => '中出し', 'count' => 1326780, 'point' => 2632188]
            ]
        ];
        
        $keywords = $keywords_data[$period] ?? $keywords_data['daily'];
        
        // より多くのキーワードを追加
        $additional_keywords = [
            ['keyword' => 'コスプレ', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => '美少女', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => 'アナル', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => 'レズ', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => '3P', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => 'SM', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => '乱交', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => 'フェラ', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => '潮吹き', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)],
            ['keyword' => '露出', 'count' => rand(500, 1000), 'point' => rand(1000, 2000)]
        ];
        
        foreach ($additional_keywords as $kw) {
            $keywords[] = $kw;
        }
        
        // ポイント順でソート
        usort($keywords, function($a, $b) {
            return $b['point'] - $a['point'];
        });
        
        // 上位30件を返す
        $keywords = array_slice($keywords, 0, 30);
        
        set_cache($cache_key, $keywords, 3600); // 1時間キャッシュ
        return $keywords;
    }
    
    /**
     * 女優一覧取得
     */
    public function getActressList($page = 1, $limit = 30) {
        $cache_key = 'fanza_actresses_list_' . $page . '_' . $limit;
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'hits' => $limit,
            'output' => 'json'
        ];
        
        $url = 'https://api.dmm.com/affiliate/v3/ActressSearch?' . http_build_query($params);
        $response = $this->callAPI($url);
        
        if ($response) {
            set_cache($cache_key, $response, 3600); // 1時間キャッシュ
        }
        
        return $response;
    }
    
    /**
     * 女優検索（頭文字）
     */
    public function searchActressByInitial($initial, $page = 1, $limit = 30) {
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'initial' => $initial,
            'hits' => $limit,
            'output' => 'json'
        ];
        
        $url = 'https://api.dmm.com/affiliate/v3/ActressSearch?' . http_build_query($params);
        $response = $this->callAPI($url);
        return $response;
    }
    
    /**
     * ジャンル一覧取得
     */
    public function getGenreList() {
        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキー未設定: getGenreList は空');
            return [];
        }
        
        $cache_key = 'fanza_all_genres';
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43',
            'hits' => '500',  // 最大数を取得
            'output' => 'json'
        ];
        
        $url = 'https://api.dmm.com/affiliate/v3/GenreSearch?' . http_build_query($params);
        
        // API呼び出しの試行
        $result = $this->callAPI($url);
        
        // API呼び出しが失敗した場合もサンプルデータを返す
        if (!$result) {
            debug_log('[FANZA API] Genre API呼び出しに失敗、サンプルデータを返します');
            return $this->getSampleGenres();
        }
        
        if ($result && isset($result['result']['genre'])) {
            $genres = $result['result']['genre'];
            
            // ひらがな順にソート
            usort($genres, function($a, $b) {
                $a_ruby = $a['ruby'] ?? $a['name'];
                $b_ruby = $b['ruby'] ?? $b['name'];
                return strcmp($a_ruby, $b_ruby);
            });
            
            set_cache($cache_key, $genres, 86400); // 24時間キャッシュ
            return $genres;
        }
        
        return [];
    }
    
    /**
     * 女優ランキング取得
     * FANZA APIでは商品の人気順から女優を抽出する
     */
    public function getActressRanking($period = 'all', $limit = 50) {
        $cache_key = 'fanza_actress_ranking_' . $period . '_' . $limit;
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        // 期間別の人気商品を取得
        $sort = 'rank';
        $hits = 100; // より多くの商品から女優を抽出
        
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'service' => 'digital',
            'floor' => 'videoa',
            'hits' => $hits,
            'sort' => $sort,
            'output' => 'json'
        ];
        
        // 期間に応じたパラメータを追加
        switch ($period) {
            case 'daily':
                $params['gte_date'] = date('Y-m-d\T00:00:00', strtotime('-1 day'));
                break;
            case 'weekly':
                $params['gte_date'] = date('Y-m-d\T00:00:00', strtotime('-7 days'));
                break;
            case 'monthly':
                $params['gte_date'] = date('Y-m-d\T00:00:00', strtotime('-30 days'));
                break;
            case 'yearly':
                $params['gte_date'] = date('Y-m-d\T00:00:00', strtotime('-365 days'));
                break;
            case 'all':
            default:
                // 全期間は特に期間指定なし
                break;
        }
        
        $url = $this->api_url . '?' . http_build_query($params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result']['items'])) {
            // 商品から女優を抽出してランキング化
            $actress_count = [];
            
            foreach ($response['result']['items'] as $item) {
                if (isset($item['iteminfo']['actress']) && is_array($item['iteminfo']['actress'])) {
                    foreach ($item['iteminfo']['actress'] as $actress) {
                        $actress_id = $actress['id'];
                        if (!isset($actress_count[$actress_id])) {
                            $actress_count[$actress_id] = [
                                'actress' => $actress,
                                'count' => 0
                            ];
                        }
                        $actress_count[$actress_id]['count']++;
                    }
                }
            }
            
            // 出演作品数でソート
            usort($actress_count, function($a, $b) {
                return $b['count'] - $a['count'];
            });
            
            // 上位のみ返す
            $ranking = array_slice($actress_count, 0, $limit);
            
            set_cache($cache_key, $ranking, 3600); // 1時間キャッシュ
            return $ranking;
        }
        
        return [];
    }
    
    /**
     * シリーズ一覧取得
     */
    public function getSeriesList($params = []) {
        // APIキーが設定されていない場合はサンプルデータを返す
        if (!$this->isAPIKeySet()) {
            debug_log('[FANZA API] APIキーが未設定のためシリーズサンプルデータを返します');
            return $this->getSampleSeries()['series'];
        }
        
        $cache_key = 'fanza_series_list_' . md5(json_encode($params));
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $series_url = 'https://api.dmm.com/affiliate/v3/SeriesSearch';
        $default_params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43', // 動画フロア
            'hits' => 100,
            'output' => 'json'
        ];
        
        $request_params = array_merge($default_params, $params);
        $url = $series_url . '?' . http_build_query($request_params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result']['series'])) {
            $series = $response['result']['series'];
            set_cache($cache_key, $series, 86400); // 24時間キャッシュ
            return $series;
        }
        
        // API呼び出しが失敗した場合もサンプルデータを返す
        debug_log('[FANZA API] シリーズAPI呼び出しに失敗、サンプルデータを返します');
        return $this->getSampleSeries()['series'];
    }

    /**
     * シリーズ一覧（ページング情報付き）
     */
    public function getSeriesListPaged($page = 1, $hits = 100) {
        // APIキーが設定されていない場合はサンプル
        if (!$this->isAPIKeySet()) {
            $series = $this->getSampleSeries()['series'];
            return [
                'series' => array_slice($series, ($page-1)*$hits, $hits),
                'total_count' => count($series)
            ];
        }

        $series_url = 'https://api.dmm.com/affiliate/v3/SeriesSearch';
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43',
            'hits' => $hits,
            'output' => 'json'
        ];
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $hits + 1; // DMMは1始まりのことがある
        }
        $url = $series_url . '?' . http_build_query($params);
        $response = $this->callAPI($url);

        if ($response && isset($response['result']['series'])) {
            $res = $response['result'];
            return [
                'series' => $res['series'],
                'total_count' => $res['total_count'] ?? count($res['series'])
            ];
        }

        // フォールバック
        $series = $this->getSampleSeries()['series'];
        return [
            'series' => array_slice($series, ($page-1)*$hits, $hits),
            'total_count' => count($series)
        ];
    }
    
    /**
     * シリーズ検索（頭文字）
     */
    public function searchSeriesByInitial($initial, $page = 1, $limit = 30) {
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43',
            'initial' => $initial,
            'hits' => $limit,
            'output' => 'json'
        ];
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $limit + 1;
        }
        
        $url = 'https://api.dmm.com/affiliate/v3/SeriesSearch?' . http_build_query($params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result'])) {
            return $response['result'];
        }
        
        return null;
    }
    
    /**
     * 作者（監督）一覧取得
     */
    public function getAuthorList($params = []) {
        $cache_key = 'fanza_author_list_' . md5(json_encode($params));
        $cached_data = get_cache($cache_key);
        
        if ($cached_data !== false) {
            return $cached_data;
        }
        
        $author_url = 'https://api.dmm.com/affiliate/v3/AuthorSearch';
        $default_params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43', // 動画フロア
            'hits' => 100,
            'output' => 'json'
        ];
        
        $request_params = array_merge($default_params, $params);
        $url = $author_url . '?' . http_build_query($request_params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result']['author'])) {
            $authors = $response['result']['author'];
            set_cache($cache_key, $authors, 86400); // 24時間キャッシュ
            return $authors;
        }
        
        return [];
    }
    
    /**
     * 作者（監督）検索（頭文字）
     */
    public function searchAuthorByInitial($initial, $page = 1, $limit = 30) {
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43',
            'initial' => $initial,
            'hits' => $limit,
            'output' => 'json'
        ];
        
        $url = 'https://api.dmm.com/affiliate/v3/AuthorSearch?' . http_build_query($params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result'])) {
            return $response['result'];
        }
        
        return null;
    }
    
    /**
     * 監督名で作品検索
     */
    public function searchByDirector($director_name, $page = 1, $hits = 30, $sort = 'date') {
        $sort_param = '-date';
        if ($sort === 'rank') $sort_param = 'rank';
        elseif ($sort === 'review') $sort_param = 'review';
        elseif ($sort === 'price') $sort_param = 'price';
        
        return $this->searchItems([
            'article' => 'director',
            'article_id' => $director_name,
            'hits' => $hits,
            'sort' => $sort_param
        ]);
    }
    
    /**
     * メーカー検索（頭文字）
     */
    public function searchMakerByInitial($initial, $page = 1, $limit = 30) {
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'floor_id' => '43',
            'initial' => $initial,
            'hits' => $limit,
            'output' => 'json'
        ];
        
        $url = 'https://api.dmm.com/affiliate/v3/MakerSearch?' . http_build_query($params);
        $response = $this->callAPI($url);
        
        if ($response && isset($response['result'])) {
            return $response['result'];
        }
        
        return null;
    }
    
    /**
     * メーカー一覧取得（ページング対応）
     */
    public function getMakerList($page = 1, $limit = 30) {
        $params = [
            'floor_id' => '43',
            'hits' => $limit
        ];
        
        // 1ページ目以外の場合のみoffsetを設定
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $limit;
        }
        
        $result = $this->getMakers($params);
        return $result;
    }
    
    /**
     * サンプルジャンルデータ（API失敗時のフォールバック）
     */
    private function getSampleGenres() {
        return [
            ['id' => '1001', 'name' => '巨乳', 'ruby' => 'きょにゅう'],
            ['id' => '1002', 'name' => '人妻', 'ruby' => 'ひとづま'],
            ['id' => '1003', 'name' => '熟女', 'ruby' => 'じゅくじょ'],
            ['id' => '1004', 'name' => '素人', 'ruby' => 'しろうと'],
            ['id' => '1005', 'name' => '制服', 'ruby' => 'せいふく'],
            ['id' => '1006', 'name' => 'OL', 'ruby' => 'おーえる'],
            ['id' => '1007', 'name' => '美少女', 'ruby' => 'びしょうじょ'],
            ['id' => '1008', 'name' => '学園もの', 'ruby' => 'がくえんもの'],
            ['id' => '1009', 'name' => '痴漢', 'ruby' => 'ちかん'],
            ['id' => '1010', 'name' => '3P', 'ruby' => 'すりーぴー'],
            ['id' => '1011', 'name' => '乱交', 'ruby' => 'らんこう'],
            ['id' => '1012', 'name' => '企画', 'ruby' => 'きかく'],
            ['id' => '1013', 'name' => '単体作品', 'ruby' => 'たんたいさくひん'],
            ['id' => '1014', 'name' => 'メイド', 'ruby' => 'めいど'],
            ['id' => '1015', 'name' => '看護師', 'ruby' => 'かんごし'],
            ['id' => '1016', 'name' => '女教師', 'ruby' => 'じょきょうし'],
            ['id' => '1017', 'name' => 'ナンパ', 'ruby' => 'なんぱ'],
            ['id' => '1018', 'name' => '中出し', 'ruby' => 'なかだし'],
            ['id' => '1019', 'name' => 'フェラ', 'ruby' => 'ふぇら'],
            ['id' => '1020', 'name' => '手コキ', 'ruby' => 'てこき']
        ];
    }

    /**
     * 同人ジャンル一覧（ページング対応）
     */
    public function getDoujinGenreListPaged($page = 1, $hits = 100) {
        if (!$this->isAPIKeySet()) {
            return ['genre'=>[], 'total_count'=>0];
        }

        $url = 'https://api.dmm.com/affiliate/v3/GenreSearch';
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'floor_id' => '81', // digital_doujin
            'hits' => $hits,
            'output' => 'json'
        ];
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $hits + 1;
        }
        $full = $url . '?' . http_build_query($params);
        $response = $this->callAPI($full);
        if ($response && isset($response['result']['genre'])) {
            $res = $response['result'];
            return [
                'genre' => $res['genre'],
                'total_count' => $res['total_count'] ?? count($res['genre'])
            ];
        }
        // フォールバック: service=doujin でも試行
        $params_fallback = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'service' => 'doujin',
            'hits' => $hits,
            'output' => 'json'
        ];
        if ($page > 1) { $params_fallback['offset'] = ($page - 1) * $hits + 1; }
        $full_fb = $url . '?' . http_build_query($params_fallback);
        $resp_fb = $this->callAPI($full_fb);
        if ($resp_fb && isset($resp_fb['result']['genre'])) {
            $res = $resp_fb['result'];
            return [
                'genre' => $res['genre'],
                'total_count' => $res['total_count'] ?? count($res['genre'])
            ];
        }
        // 失敗時は空
        return ['genre'=>[], 'total_count'=>0];
    }

    /**
     * 同人シリーズ一覧（ページング対応）
     */
    public function getDoujinSeriesListPaged($page = 1, $hits = 60) {
        if (!$this->isAPIKeySet()) {
            return ['series'=>[], 'total_count'=>0];
        }

        $url = 'https://api.dmm.com/affiliate/v3/SeriesSearch';
        $params = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'floor_id' => '81', // digital_doujin
            'hits' => $hits,
            'output' => 'json'
        ];
        if ($page > 1) {
            $params['offset'] = ($page - 1) * $hits + 1;
        }
        $full = $url . '?' . http_build_query($params);
        $response = $this->callAPI($full);
        if ($response && isset($response['result']['series'])) {
            $res = $response['result'];
            return [
                'series' => $res['series'],
                'total_count' => $res['total_count'] ?? count($res['series'])
            ];
        }
        // フォールバック: service=doujin でも試行
        $params_fb = [
            'api_id' => $this->api_id,
            'affiliate_id' => $this->affiliate_id,
            'site' => 'FANZA',
            'service' => 'doujin',
            'hits' => $hits,
            'output' => 'json'
        ];
        if ($page > 1) { $params_fb['offset'] = ($page - 1) * $hits + 1; }
        $full2 = $url . '?' . http_build_query($params_fb);
        $resp2 = $this->callAPI($full2);
        if ($resp2 && isset($resp2['result']['series'])) {
            $res = $resp2['result'];
            return [
                'series' => $res['series'],
                'total_count' => $res['total_count'] ?? count($res['series'])
            ];
        }
        // 失敗時は空
        return ['series'=>[], 'total_count'=>0];
    }
    
    /**
     * サンプル女優データ（API失敗時のフォールバック）
     */
    private function getSampleActresses() {
        return [
            'actress' => [
                ['id' => '2001', 'name' => '山田花子', 'ruby' => 'やまだはなこ'],
                ['id' => '2002', 'name' => '田中美穂', 'ruby' => 'たなかみほ'],
                ['id' => '2003', 'name' => '鈴木愛', 'ruby' => 'すずきあい'],
                ['id' => '2004', 'name' => '佐藤麻衣', 'ruby' => 'さとうまい'],
                ['id' => '2005', 'name' => '伊藤美咲', 'ruby' => 'いとうみさき'],
                ['id' => '2006', 'name' => '高橋彩', 'ruby' => 'たかはしあや'],
                ['id' => '2007', 'name' => '小林真由', 'ruby' => 'こばやしまゆ'],
                ['id' => '2008', 'name' => '加藤優花', 'ruby' => 'かとうゆか'],
                ['id' => '2009', 'name' => '吉田奈々', 'ruby' => 'よしだなな'],
                ['id' => '2010', 'name' => '渡辺みなみ', 'ruby' => 'わたなべみなみ']
            ]
        ];
    }
    
    /**
     * サンプルメーカーデータ（API失敗時のフォールバック）
     */
    private function getSampleMakers() {
        return [
            'maker' => [
                ['id' => '3001', 'name' => 'サンプルメーカー1', 'ruby' => 'さんぷるめーかーいち'],
                ['id' => '3002', 'name' => 'サンプルメーカー2', 'ruby' => 'さんぷるめーかーに'],
                ['id' => '3003', 'name' => 'サンプルメーカー3', 'ruby' => 'さんぷるめーかーさん'],
                ['id' => '3004', 'name' => 'サンプルメーカー4', 'ruby' => 'さんぷるめーかーよん'],
                ['id' => '3005', 'name' => 'サンプルメーカー5', 'ruby' => 'さんぷるめーかーご']
            ]
        ];
    }
    
    /**
     * サンプルシリーズデータ（API失敗時のフォールバック）
     */
    private function getSampleSeries() {
        return [
            'series' => [
                ['id' => '4001', 'name' => 'サンプルシリーズ1', 'ruby' => 'さんぷるしりーずいち'],
                ['id' => '4002', 'name' => 'サンプルシリーズ2', 'ruby' => 'さんぷるしりーずに'],
                ['id' => '4003', 'name' => 'サンプルシリーズ3', 'ruby' => 'さんぷるしりーずさん'],
                ['id' => '4004', 'name' => 'サンプルシリーズ4', 'ruby' => 'さんぷるしりーずよん'],
                ['id' => '4005', 'name' => 'サンプルシリーズ5', 'ruby' => 'さんぷるしりーずご']
            ]
        ];
    }
    
    /**
     * サンプルフロアデータ（API失敗時のフォールバック）
     */
    private function getSampleFloors() {
        return [
            'site' => [
                [
                    'name' => 'FANZA',
                    'code' => 'FANZA',
                    'service' => [
                        [
                            'name' => 'デジタル',
                            'code' => 'digital',
                            'floor' => [
                                ['name' => '動画', 'code' => 'videoa'],
                                ['name' => '電子書籍', 'code' => 'book'],
                                ['name' => '同人', 'code' => 'doujin'],
                                ['name' => 'PCゲーム', 'code' => 'pcgame']
                            ]
                        ]
                    ]
                ]
            ]
        ];
    }
    
    /**
     * サンプル商品データ（API失敗時のフォールバック）
     */
    private function getSampleItems($params = []) {
        $keyword = $params['keyword'] ?? '';
        $hits = $params['hits'] ?? 30;
        
        // サンプル商品データ
        $sample_items = [
            [
                'content_id' => 'sample001',
                'title' => 'サンプル動画1：美しい女優による素晴らしい作品（巨乳 制服）',
                'date' => date('Y-m-d'),
                'imageURL' => [
                    'large' => 'https://pics.dmm.co.jp/digital/video/sample001/sample001pl.jpg',
                    'list' => 'https://pics.dmm.co.jp/digital/video/sample001/sample001pt.jpg'
                ],
                'sampleMovieURL' => [
                    'size_720_480' => 'https://cc3001.dmm.co.jp/litevideo/freepv/sample001_dmb_w.mp4'
                ],
                'URL' => 'https://www.dmm.co.jp/digital/videoa/-/detail/=/cid=sample001/',
                'price' => '300',
                'actress' => [
                    ['id' => '1001', 'name' => 'サンプル女優1']
                ]
            ],
            [
                'content_id' => 'sample002', 
                'title' => 'サンプル動画2：話題の新作アダルトビデオ（人妻 NTR）',
                'date' => date('Y-m-d', strtotime('-1 day')),
                'imageURL' => [
                    'large' => 'https://pics.dmm.co.jp/digital/video/sample002/sample002pl.jpg',
                    'list' => 'https://pics.dmm.co.jp/digital/video/sample002/sample002pt.jpg'
                ],
                'sampleMovieURL' => [
                    'size_720_480' => 'https://cc3001.dmm.co.jp/litevideo/freepv/sample002_dmb_w.mp4'
                ],
                'URL' => 'https://www.dmm.co.jp/digital/videoa/-/detail/=/cid=sample002/',
                'price' => '250',
                'actress' => [
                    ['id' => '1002', 'name' => 'サンプル女優2']
                ]
            ],
            [
                'content_id' => 'sample003',
                'title' => 'サンプル動画3：人気シリーズの最新作（3DCG 快楽堕ち）',
                'date' => date('Y-m-d', strtotime('-2 days')),
                'imageURL' => [
                    'large' => 'https://pics.dmm.co.jp/digital/video/sample003/sample003pl.jpg',
                    'list' => 'https://pics.dmm.co.jp/digital/video/sample003/sample003pt.jpg'
                ],
                'sampleMovieURL' => [],
                'URL' => 'https://www.dmm.co.jp/digital/videoa/-/detail/=/cid=sample003/',
                'price' => '400',
                'actress' => [
                    ['id' => '1003', 'name' => 'サンプル女優3']
                ]
            ]
        ];
        
        // キーワード検索の場合はフィルタリング
        if (!empty($keyword)) {
            $filtered = array_filter($sample_items, function($item) use ($keyword) {
                return stripos($item['title'], $keyword) !== false;
            });
            if (!empty($filtered)) {
                $sample_items = array_values($filtered);
            }
        }
        
        // 要求数に応じて調整
        $sample_items = array_slice($sample_items, 0, $hits);
        
        return [
            'items' => array_values($sample_items),
            'total_count' => count($sample_items),
            'first_position' => 1
        ];
    }
    
    /**
     * サンプル商品詳細データ（API失敗時のフォールバック）
     */
    private function getSampleItemDetail($content_id) {
        return [
            'content_id' => $content_id,
            'product_id' => $content_id,
            'title' => 'サンプル動画タイトル ' . $content_id,
            'URL' => '#',
            'affiliateURL' => '#',
            'imageURL' => [
                'small' => 'https://via.placeholder.com/120x90?text=Sample',
                'medium' => 'https://via.placeholder.com/200x150?text=Sample',
                'large' => 'https://via.placeholder.com/300x225?text=Sample'
            ],
            'sampleMovieURL' => [
                'size_560_360' => 'https://via.placeholder.com/560x360.mp4?text=Sample+Video'
            ],
            'sampleImageURL' => [
                'sample_s' => [
                    'image' => [
                        'https://via.placeholder.com/100x75?text=S1',
                        'https://via.placeholder.com/100x75?text=S2',
                        'https://via.placeholder.com/100x75?text=S3'
                    ]
                ]
            ],
            'prices' => [
                'price' => '1500円'
            ],
            'date' => date('Y-m-d H:i:s'),
            'iteminfo' => [
                'actress' => [
                    ['id' => '1001', 'name' => 'サンプル女優', 'ruby' => 'さんぷるじょゆう']
                ],
                'genre' => [
                    ['id' => '1001', 'name' => '巨乳'],
                    ['id' => '1002', 'name' => '人妻']
                ],
                'series' => [
                    ['id' => '2001', 'name' => 'サンプルシリーズ', 'ruby' => 'さんぷるしりーず']
                ],
                'maker' => [
                    ['id' => '3001', 'name' => 'サンプルメーカー', 'ruby' => 'さんぷるめーかー']
                ],
                'director' => [
                    ['id' => '4001', 'name' => 'サンプル監督', 'ruby' => 'さんぷるかんとく']
                ]
            ],
            'volume' => '120',
            'review' => [
                'count' => 25,
                'average' => '4.2'
            ]
        ];
    }
}

    // FANZA API 標準
    if (!empty($item['imageURL']) && is_array($item['imageURL'])) {
        if ($size === 'large' && !empty($item['imageURL']['large'])) {
            return (string)$item['imageURL']['large'];
        }

        if (!empty($item['imageURL']['small'])) {
            return (string)$item['imageURL']['small'];
        }

        if (!empty($item['imageURL']['list'])) {
            return (string)$item['imageURL']['list'];
        }
    }

    // 直接キー対応
    if ($size === 'large' && !empty($item['large_image'])) {
        return (string)$item['large_image'];
    }

    if (!empty($item['small_image'])) {
        return (string)$item['small_image'];
    }

    if (!empty($item['image'])) {
        return (string)$item['image'];
    }

    // DB保存系
    if (!empty($item['ogp_image'])) {
        return (string)$item['ogp_image'];
    }

    if (!empty($item['package_image'])) {
        return (string)$item['package_image'];
    }

    return '/images/noimage.jpg';
}
}

// ============================================
// 互換ラッパー: fanza_search_items() 安全版
// （実装が見つからない場合は空配列を返して落ちないようにする）
// ============================================
if (!function_exists('fanza_search_items')) {

    function fanza_search_items(array $params = [])
    {
        // もし将来 FanzaApiClient や他の関数を用意したら、
        // ここでそれを呼ぶように書き換えればOK。

        // 現時点では何も実装されていないので、
        // サイトが落ちないように「空配列」を返しておく。
        debug_log('fanza_search_items() fallback: 実装が見つからないため空配列を返しました');
        return [];
    }
}