//+------------------------------------------------------------------+
//|                                                        CLLMClient.mqh |
//|                 Centaur Quant Architecture — Models Module        |
//|      "The Brain" Client for MQL5 — File-Based Periodic Bridge      |
//+------------------------------------------------------------------+
//|  PURPOSE                                                          |
//|  Kanal LLM dari EA TANPA server HTTP dan tanpa WebRequest:        |
//|   EA menulis  MQL5\Files\ai_request.json  (envelope SDP)          |
//|   Python      assistant_bridge.py polling periodik -> LLM         |
//|   EA membaca  MQL5\Files\ai_response.json (id+score+reason)       |
//|  Satu panggilan LLM per setup (dedupe by id) — hemat token.       |
//|  Anti-Veto: tanpa response sebelum deadline -> 40.0 (quarter-risk)|
//+------------------------------------------------------------------+
#property strict

#ifndef LLMCLIENT_MQH
#define LLMCLIENT_MQH

#define CLLM_FALLBACK_SCORE   40.0
#define CLLM_MAX_REASON_WORDS 10

#define CLLM_REQ_FILE "ai_request.json"
#define CLLM_RES_FILE "ai_response.json"

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CLLMClient
  {
private:
   int               m_timeout_ms;   // fallback deadline untuk menunggu response
   bool              m_ready;
   bool              m_pending;      // request sedang menunggu response
   string            m_pending_id;   // id request aktif (dedupe di bridge)
   ulong             m_deadline_ms;  // GetTickCount64() batas tunggu
   ulong             m_id_seq;       // S6: penambah unik id (anti-collision 1 ms)

   string            EscapeJson(const string value);
   string            BuildRequestBody(const string symbol, const string timeframe,
                                      const string setup_type, const double entry,
                                      const double sl, const double tp,
                                      const string historical_context_json);
   bool              ParseScoreDirect(const string raw, double &score, string &reason);

public:
                     CLLMClient(const int timeout_ms = 15000);
                    ~CLLMClient();

   bool              IsReady() const { return m_ready; }
   bool              IsPending() const { return m_pending; }
   bool              DeadlinePassed() const
     {
      return (m_pending && GetTickCount64() > m_deadline_ms);
     }

   //--- tulis request (file); true bila terkirim ---
   bool              SendRequest(const string symbol, const string timeframe,
                                 const string setup_type, const double entry,
                                 const double sl, const double tp,
                                 const string historical_context_json);

   //--- baca response (file) bila id cocok; konsumsi file ---
   bool              TryReadResponse(double &score, string &reason);

   //--- batalkan pending (fallback / timeout) ---
   void              ResetPending();
  };
//+------------------------------------------------------------------+
//| Constructor — timeout = batas tunggu response (ms).               |
//+------------------------------------------------------------------+
CLLMClient::CLLMClient(const int timeout_ms)
   : m_timeout_ms(MathMax(timeout_ms, 3000)),
     m_ready(true),
     m_pending(false),
     m_pending_id(""),
     m_deadline_ms(0),
     m_id_seq(0)
  {
   PrintFormat("[CLLMClient] INFO: ready (file-based bridge; fallback timeout %d ms).",
               m_timeout_ms);
  }
//+------------------------------------------------------------------+
//| Destructor — nothing to release.                                  |
//+------------------------------------------------------------------+
CLLMClient::~CLLMClient()
  {
  }
//+------------------------------------------------------------------+
//| SendRequest — tulis envelope SDP ke ai_request.json (truncate).   |
//| id = GetTickCount64() agar bridge mendeteksi request baru.        |
//+------------------------------------------------------------------+
bool CLLMClient::SendRequest(const string symbol, const string timeframe,
                             const string setup_type, const double entry,
                             const double sl, const double tp,
                             const string historical_context_json)
  {
   if(!m_ready)
      return false;
   if(m_pending)
     {
      PrintFormat("[CLLMClient] WARNING: request sebelumnya masih pending. Ditimpa.");
     }
   m_pending_id = IntegerToString((ulong)GetTickCount64()) + "-" + IntegerToString(m_id_seq++);
   const string body = BuildRequestBody(symbol, timeframe, setup_type, entry, sl, tp,
                                        historical_context_json);
   const string tmp_path = CLLM_REQ_FILE + ".tmp";   // S3: tulis atomik, rename setelah close
   const int h = FileOpen(tmp_path, FILE_WRITE | FILE_TXT | FILE_ANSI);
   if(h == INVALID_HANDLE)
     {
      PrintFormat("[CLLMClient] ERROR: FileOpen(%s) gagal. GetLastError=%d.",
                  CLLM_REQ_FILE, GetLastError());
      return false;
     }
   FileWrite(h, body);
   FileClose(h);
   if(!FileMove(tmp_path, 0, CLLM_REQ_FILE, FILE_REWRITE))   // S3: rename atomik
     {
      PrintFormat("[CLLMClient] ERROR: FileMove ke %s gagal. GetLastError=%d.",
                  CLLM_REQ_FILE, GetLastError());
      return false;
     }
   m_pending     = true;
   m_deadline_ms = GetTickCount64() + m_timeout_ms;
   PrintFormat("[CLLMClient] INFO: request %s dikirim (LLM async).", m_pending_id);
   return true;
  }
//+------------------------------------------------------------------+
//| TryReadResponse — baca ai_response.json; konsumsi hanya bila id   |
//| cocok dengan request aktif. File dihapus setelah dibaca.          |
//+------------------------------------------------------------------+
bool CLLMClient::TryReadResponse(double &score, string &reason)
  {
   score  = -1.0;
   reason = "";
   if(!m_pending)
      return false;
   const int h = FileOpen(CLLM_RES_FILE, FILE_READ | FILE_TXT | FILE_ANSI);
   if(h == INVALID_HANDLE)
      return false;   // belum ada response
   string content = "";
   while(!FileIsEnding(h))
      content += FileReadString(h);
   FileClose(h);
//--- cocokkan id request ---
   const string id_key = "\"id\":\"";
   const int ip = StringFind(content, id_key);
   if(ip >= 0)
     {
      string rid = StringSubstr(content, ip + StringLen(id_key));
      const int ic = StringFind(rid, "\"");
      if(ic >= 0)
         rid = StringSubstr(rid, 0, ic);
      if(rid != m_pending_id)
        {
         PrintFormat("[CLLMClient] INFO: response id %s != request %s (menunggu).",
                     rid, m_pending_id);
         return false;   // response lama/menengah — jangan dikonsumsi
        }
     }
   else
      return false;
   if(!ParseScoreDirect(content, score, reason))
     {
      PrintFormat("[CLLMClient] WARNING: response tidak punya score. Neutral %.1f.",
                  CLLM_FALLBACK_SCORE);
      FileDelete(CLLM_RES_FILE);
      m_pending = false;
      score = CLLM_FALLBACK_SCORE;
      return true;
     }
   FileDelete(CLLM_RES_FILE);   // konsumsi (proses sekali saja)
   m_pending = false;
   PrintFormat("[CLLMClient] INFO: response diterima — score %.2f.", score);
   return true;
  }
//+------------------------------------------------------------------+
//| ResetPending — batalkan tunggu (fallback timeout / manual).       |
//+------------------------------------------------------------------+
void CLLMClient::ResetPending()
  {
   m_pending = false;
   m_pending_id = "";
   FileDelete(CLLM_RES_FILE);
  }
//+------------------------------------------------------------------+
//| BuildRequestBody — envelope SDP lengkap untuk MarketAnalyzer.     |
//+------------------------------------------------------------------+
string CLLMClient::BuildRequestBody(const string symbol, const string timeframe,
                                    const string setup_type, const double entry,
                                    const double sl, const double tp,
                                    const string historical_context_json)
  {
   string b = "{";
   b += "\"id\":\"" + m_pending_id + "\",";
   b += "\"symbol\":\"" + EscapeJson(symbol) + "\",";
   b += "\"timeframe\":\"" + EscapeJson(timeframe) + "\",";
   b += "\"action_type\":\"Setup_Detected\",";
   b += "\"algorithmic_confidence_score\":0,";
   b += "\"payload\":{";
   b += "\"setup_type\":\"" + EscapeJson(setup_type) + "\",";
   b += "\"entry\":" + DoubleToString(entry, 5) + ",";
   b += "\"sl\":"    + DoubleToString(sl, 5) + ",";
   b += "\"tp\":"    + DoubleToString(tp, 5);
   b += "},";
   b += "\"historical_context\":";
   b += (StringLen(historical_context_json) > 0) ? historical_context_json : "[]";
   b += "}";
   return b;
  }
//+------------------------------------------------------------------+
//| EscapeJson — minimal JSON string escaping.                        |
//+------------------------------------------------------------------+
string CLLMClient::EscapeJson(const string value)
  {
   string out = "";
   const int len = StringLen(value);
   for(int i = 0; i < len; i++)
     {
      const ushort c = StringGetCharacter(value, i);
      switch(c)
        {
         case '"':
            out += "\\\"";
            break;
         case '\\':
            out += "\\\\";
            break;
         case '\n':
            out += "\\n";
            break;
         case '\r':
            out += "\\r";
            break;
         case '\t':
            out += "\\t";
            break;
         default:
            if(c < 0x20)
               out += StringFormat("\\u%04x", c);
            else
               out += ShortToString(c);
        }
     }
   return out;
  }
//+------------------------------------------------------------------+
//| ParseScoreDirect — {"score": n, "reason": "..."} dalam teks apa   |
//| pun (response bridge).                                            |
//+------------------------------------------------------------------+
bool CLLMClient::ParseScoreDirect(const string raw, double &score, string &reason)
  {
   score  = -1.0;
   reason = "";
   const int sp = StringFind(raw, "\"score\"");
   int sq = (sp >= 0) ? StringFind(raw, ":", sp) : -1;
   if(sq < 0)
      return false;
   sq++;
   while(sq < StringLen(raw) && StringGetCharacter(raw, sq) == ' ')
      sq++;
   string num = "";
   while(sq < StringLen(raw))
     {
      const ushort c = StringGetCharacter(raw, sq);
      if((c < '0' || c > '9') && c != '.' && c != '-')
         break;
      num += ShortToString(c);
      sq++;
     }
   if(StringLen(num) == 0)
      return false;
   score = StringToDouble(num);
   if(!MathIsValidNumber(score) || score < 0.0 || score > 100.0)
      return false;
   const int rp = StringFind(raw, "\"reason\"");
   int rq = (rp >= 0) ? StringFind(raw, ":", rp) : -1;
   if(rq >= 0)
     {
      rq++;
      while(rq < StringLen(raw) && StringGetCharacter(raw, rq) != '"')
         rq++;
      rq++;
      string r = "";
      while(rq < StringLen(raw) && StringGetCharacter(raw, rq) != '"')
        {
         r += ShortToString(StringGetCharacter(raw, rq));
         rq++;
        }
      string words[];
      const int wn = StringSplit(r, ' ', words);
      if(wn > CLLM_MAX_REASON_WORDS)
        {
         r = "";
         for(int i = 0; i < CLLM_MAX_REASON_WORDS; i++)
            r += (i > 0 ? " " : "") + words[i];
        }
      reason = r;
     }
   return true;
  }

#endif // LLMCLIENT_MQH