class SAP_Medical_Classifier {

    public static function classify($query) {

        $map = [
            'ed' => '泌尿器科',
            '勃起' => '泌尿器科',
            '薄毛' => '皮膚科',
            'aga' => '皮膚科',
            '不眠' => '心療内科',
            '動悸' => '循環器内科'
        ];

        $query = strtolower($query);

        foreach ($map as $keyword => $dept) {
            if (strpos($query, $keyword) !== false) {
                return $dept;
            }
        }

        return null;
    }
}
class SAP_AI_Search {

    public static function search($query) {

        $expanded = SAP_Synonym::expand($query);
        $index = get_option('sap_vector_index', []);

        $scores = SAP_BM25::score($expanded, $index);

        return $scores;
    }
}
class SAP_REST {

    public static function init(){

        register_rest_route('sap/v1','/ai-search',[
            'methods'=>'GET',
            'callback'=>[__CLASS__,'search'],
            'permission_callback'=>'__return_true'
        ]);
    }

    public static function search($req){

        $query = sanitize_text_field($req['q']);
        $cache_key = 'sap_ai_'.md5($query);

        if($cached = get_transient($cache_key)){
            return $cached;
        }

        $results = SAP_AI_Search::search($query);

        $response = [
            'query'=>$query,
            'department'=>SAP_Medical_Classifier::classify($query),
            'results'=>$results
        ];

        set_transient($cache_key,$response,600);

        return $response;
    }
}
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