/*************************************************************************
 *
 * HTCd - Copyright (C) 1998-2006 Henrik Rydberg
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef MSTRINGH
#define MSTRINGH

#include <mt/mstream.h>
#include <mt/uniheap.h>

const int ms_mincaps=32;

class mstring : public sref {
public:
  mstring();
  explicit mstring(int n);
  mstring(int n,char c);
  mstring(const char* s);
  mstring(const char* s,int n);
  mstring(const sref& s);
  mstring(const mstring& s);
  ~mstring();
  
  ////////////////////////////////////////////////////////////////

  const char* c_str() const { return map; }
  int capacity() const { return caps; }

  void clear() { map[dim=0]=0; }

  int own(const sref& s) const { int p=s.data()-map; return p>=0&&p<caps; }
  
  ////////////////////////////////////////////////////////////////

  void assign(int sdim,char c) {
    resize(sdim);
    memset(map,c,sdim);
  }
  void assign(const sref& s) {
    reserve(s.size());
    memmove(map,s.data(),s.size());
    map[dim=s.size()]=0;
  }
  
  void put(char c) { if(dim+1>=caps) reserve(dim+1); map[dim++]=c; map[dim]=0; }
  void put(const sref& s) {
    reserve(dim+s.size()); 
    memcpy(map+dim,s.data(),s.size());
    map[dim+=s.size()]=0;
  }

  mstring& append(int sdim,char c) {
    reserve(dim+sdim);
    memset(map+dim,c,sdim);
    map[dim+=sdim]=0;
    return *this;
  }

  mstring& append(const sref& s) {
    reserve(dim+s.size());
    memmove(map+dim,s.data(),s.size());
    map[dim+=s.size()]=0;
    return *this;
  }

  int insert(int pos,int n) {
    if(pos<0||pos>dim) return 0;
    if(n) { reserve(dim+n); memmove(map+pos+n,map+pos,dim-pos); map[dim+=n]=0; }
    return 1;
  }

  mstring& insert(int pos,int sdim,char c) {
    if(insert(pos,sdim)) memset(map+pos,c,sdim);
    return *this;
  }
  mstring& insert(int pos,const sref& s) {
    if(insert(pos,s.size())) memcpy(map+pos,s.data(),s.size());
    return *this;
  }

  mstring& replace(int pos,int n,int sdim,char c) {
    if(insert(pos+n,sdim-n)) memset(map+pos,c,sdim);
    return *this;
  }
  mstring& replace(int pos,int n,const sref& s) {
    if(insert(pos+n,s.size()-n)) memcpy(map+pos,s.data(),s.size());
    return *this;
  }

  ////////////////////////////////////////////////////////////////

  void erase(int pos,int n=-1);
  void reserve(int n);
  void resize(int n) { reserve(n); map[dim=n]=0; }
  
  ////////////////////////////////////////////////////////////////

  mstring& operator=(const mstring& s) { assign(s); return *this; }
  mstring& operator=(const sref& s) { assign(s); return *this; }
  mstring& operator=(char c) { assign(1,c); return *this; }

  mstring& operator+=(const sref& s) { return append(s); }
  mstring& operator+=(char c) { return append(1,c); }

  ////////////////////////////////////////////////////////////////

  int load(const mstring& path);

  ////////////////////////////////////////////////////////////////

  // NOTE: if you apply convert to %s or any unbound data,
  // you're in trouble. Internal buffer is sref_t.

  mstring& convert(const char* format,...);

protected:
  static uniheap<ms_mincaps> heap;
private:
  int caps;
};

///////////////////////////////////////////////////////////////////

inline void swap(mstring& a,mstring& b)
{
  char buf[sizeof(mstring)];
  memcpy(buf,&a,sizeof(mstring));
  memcpy(&a,&b,sizeof(mstring));
  memcpy(&b,buf,sizeof(mstring));
}

///////////////////////////////////////////////////////////////////

inline mstring operator+(const sref& a,const sref& b)
{
  return mstring(a).append(b);
}
inline mstring operator+(const sref& a,char b) {
  return mstring(a).append(1,b);
}
inline mstring operator+(char a,const sref& b) {
  return mstring(1,a).append(b);
}

///////////////////////////////////////////////////////////////////

inline mstring btoa(int b) { return mstring(1,b?'1':'0'); }
inline mstring itoa(int i) { sref_t buf; return mstring(itoa(buf,i)); }
inline mstring ftoa(double f) { sref_t buf; return mstring(ftoa(buf,f)); }

///////////////////////////////////////////////////////////////////

const mstring ms_empty;

///////////////////////////////////////////////////////////////////

struct swrite : public cvt_stream {
  mstring* mp;
  
  int appc(char c);
  int apps(const sref& s);

  swrite() : mp(0) {}
  swrite(mstring& m) : mp(&m) { mp->clear(); }

  swrite& operator()(mstring& m) { (mp=&m)->clear(); return *this; }
  swrite& hold(mstring& m) { mp=&m; return *this; }
};

///////////////////////////////////////////////////////////////////

class mswrite : public cvt_stream {
public:
  mstring m;

  int appc(char c);
  int apps(const sref& s);
  
  const mstring& str() const { return m; } // compatibility
  void clear() { m.clear(); }

  mswrite() : m() {}
private:
  mswrite(mstring&) {} // make no mistakes due to similarity with swrite
};

///////////////////////////////////////////////////////////////////

struct merror_t : public cvt_stream {
  int num;
  mstring desc;

  int appc(char c);
  int apps(const sref& s);

  merror_t(int n) : num(n),desc() {}
};

#define THROW(x) { merror_t merr(0); merr<<x; throw merr; }

///////////////////////////////////////////////////////////////////

void getline(mstring& m,FILE* fp,char end='\n');

///////////////////////////////////////////////////////////////////

#endif