class SAP_BM25 {

    public static function score($query_terms, $index) {

        $N = count($index);
        $k1 = 1.5;
        $b  = 0.75;

        $doc_lengths = [];
        $avgdl = 0;

        foreach ($index as $id => $vector) {
            $len = array_sum($vector);
            $doc_lengths[$id] = $len;
            $avgdl += $len;
        }

        $avgdl = $avgdl / max($N,1);

        $scores = [];

        foreach ($index as $id => $vector) {

            $score = 0;
            $dl = $doc_lengths[$id];

            foreach ($query_terms as $term) {

                $df = 0;
                foreach ($index as $doc) {
                    if (isset($doc[$term])) $df++;
                }

                if ($df == 0) continue;

                $idf = log(($N - $df + 0.5)/($df + 0.5) + 1);

                $tf = $vector[$term] ?? 0;

                $score += $idf * (
                    ($tf * ($k1 + 1)) /
                    ($tf + $k1 * (1 - $b + $b * ($dl/$avgdl)))
                );
            }

            if ($score > 0) $scores[$id] = $score;
        }

        arsort($scores);
        return $scores;
    }
}
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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