//+------------------------------------------------------------------+
//|                                                        UView.mqh |
//|                                   Copyright 2026, Niquel Mendoza |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, Niquel Mendoza"
#property link      "https://www.mql5.com"
#property strict

#ifndef TSNSTD_SRC_STRING_UVIEW_MQH
#define TSNSTD_SRC_STRING_UVIEW_MQH

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#include "Buffer.mqh"

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
// Generalmente no se chekea rangos solo en At

#define MQLARTICLES_STRVIEW_IDX(POS)  (m_start + (POS))
#define MQLARTICLES_STRVIEW_VAL(IDX)   m_ctx.m_raw[MQLARTICLES_STRVIEW_IDX(IDX)]

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
// View
// las funciones de materializacion como SubStr entre otras... tineen 2-3 variantes Raw\Ctx\Buffer
// - Raw: usa CharArray to string directo
// - Ctx: usa el metodo que provee ctx..
// Las demas funciones como find etc.. trabajan sobre el buffer raw.

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
template <typename TOuner>
struct CStringView
 {
  TOuner* const      m_ctx;
  int                m_len;
  int                m_start;

  //---
                     CStringView(const int start, const int len, TOuner* ctx)
    :                m_len(len), m_start(start), m_ctx(ctx) {}


  //--- acceso
  __forceinline uchar operator[](const int pos) const { return MQLARTICLES_STRVIEW_VAL(pos);                               }
  __forceinline uchar At(const int pos)         const { return pos < 0 || pos >= m_len ? 0 : MQLARTICLES_STRVIEW_VAL(pos); }
  __forceinline uchar Front()                   const { return MQLARTICLES_STRVIEW_VAL(0);                                 }
  __forceinline uchar Back()                    const { return MQLARTICLES_STRVIEW_VAL(m_len - 1);                         }


  //--- modificadores de ventana
  __forceinline void  RemovePrefix(int n) { m_len -= n;   }
  __forceinline void  RemoveSuffix(int n) { m_start += n; }

  //--- operaciones
  //- subtr (materializacino del view .. a string o uchar o tambien otro subview)
  // num no peude ser negativo si quiere usar "MAX" use INT_MAX o algo asi.. luego ya se noramloza con min
  // string final
  __forceinline string SubtrStr(const int pos, const int num, uint cp = CP_ACP) const;
  __forceinline int  SubtrStr(uchar& in[], const int pos, const int num) const;

  // view
  __forceinline CStringView SubtrView(const int pos, const int num) const;

  //- compare
  __forceinline uchar CmpLex(const string& other) const;


  //- stats with
  __forceinline bool StartsWith(const uchar c) const { return MQLARTICLES_STRVIEW_VAL(0) == c;         }
  __forceinline bool EndsWith(const uchar c) const   { return MQLARTICLES_STRVIEW_VAL(m_len - 1) == c; }

  //- apis
  __forceinline void Trim();

  //- find
  __forceinline int  Find(const uchar c, int pos = 0) const;
  __forceinline int  FindWithSwar(const uchar c, int pos = 0) const;
  //int                FindWithMComp(const uchar c, int pos = 0) const;

  //- reverse find
  __forceinline int  RFind(const uchar c, int rend = 1) const;


  //------- extras movidos para que compile (el compilador no esta tan bueno)
  template <typename TSuOwner>
  __forceinline uchar CmpLexW(const CStringView<TSuOwner>& other) const
   {
    return CStringBuffer::CmpLex(
             // this
             m_ctx.m_raw, m_start, m_len,
             // other
             other.m_ctx.m_raw, other.m_start, other.m_len
           );
   }
 };

//+------------------------------------------------------------------+
//| Subtr                                                            |
//+------------------------------------------------------------------+
template <typename TOuner>
__forceinline string CStringView::SubtrStr(const int pos, const int num, uint cp = CP_ACP) const
 {
  return CharArrayToString(m_ctx.m_raw, MQLARTICLES_STRVIEW_IDX(pos), fmin(num, m_len), cp);
 }

//+------------------------------------------------------------------+
template <typename TOuner>
__forceinline int CStringView::SubtrStr(uchar& in[], const int pos, const int num) const
 {
  return ArrayCopy(in, m_ctx.m_raw, 0, MQLARTICLES_STRVIEW_IDX(pos), fmin(num, m_len));
 }

//+------------------------------------------------------------------+
// view
template <typename TOuner>
__forceinline CStringView CStringView::SubtrView(const int pos, const int num) const
 {
// retorna el minimo de len si num es mucho se usa el len acutal si no el que se nos paso
  return CStringView(MQLARTICLES_STRVIEW_IDX(pos), fmin(num, m_len), m_ctx);
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
template <typename TOuner>
__forceinline uchar CStringView::CmpLex(const string& other) const
 {
  return CStringBuffer::CmpLex(m_ctx.m_raw, m_start, m_len, other);
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
template <typename TOuner>
__forceinline int CStringView::Find(const uchar c, int pos = 0) const
 {
  return CStringBuffer::Find(c, m_ctx.m_raw, MQLARTICLES_STRVIEW_IDX(pos), m_len, m_start);
 }

//+------------------------------------------------------------------+
template <typename TOuner>
__forceinline int CStringView::FindWithSwar(const uchar c, int pos = 0) const
 {
  return CStringBuffer::FindSwar(c, m_ctx.m_raw, MQLARTICLES_STRVIEW_IDX(pos), m_len, m_start);
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
template <typename TOuner>
__forceinline int CStringView::RFind(const uchar c, int rend = 1) const
 {
  return CStringBuffer::RFind(c, m_ctx.m_raw, (m_start + m_len) - rend, m_start);
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
template <typename TOuner>
__forceinline void CStringView::Trim()
 {
  CStringBuffer::Trim(m_ctx.m_raw, m_len, m_start);
 }
}
//+------------------------------------------------------------------+
#endif // TSNSTD_SRC_STRING_UVIEW_MQH