#ifndef _SSTRING_SIMPLE_H_
#define _SSTRING_SIMPLE_H_

#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

class ExtValue;  //this include would result in recurrent inclusion: #include "extvalue.h"
class ExtObject;

class SString
{
private:
char *txt;      ///< string buffer or NULL for empty string
int size;       ///< allocated memory (including \0)
int used;	///< string length
int appending;  ///< append mode, changes can occur after character # 'appending'

void initEmpty();
void copyFrom(SString &from); ///< copy from SString
void resize(int newsize);
void ensureSize(int needed);
const char* getPtr() const {return txt?txt:"";}

public:
SString(); ///< make an empty string
SString(const char*t,int t_len=-1); ///< make a string from char*
SString(int x); ///< string with initial buffer allocated for x characters
SString(const SString& from); ///< duplicate string
SString(SString&& from);///< move
~SString();

void copyFrom(const char* ch, int chlen=-1); ///< copy string, length of -1 == unknown

void* operator new(size_t s, void* mem) {return mem;}
#ifdef _MSC_VER
void operator delete(void* mem, void* t) {}
#endif
void* operator new(size_t s) {return malloc(sizeof(SString));}
void operator delete(void* mem) {free(mem);}

int len() const {return used;} ///< get string length
void shrink(); ///< free unnecessary buffer

/// after this call, you can modify sstring directly.
/// returned value is the pointer to the internal buffer.
/// <B>ensuresize</B> is minimal value of bytes you need,
/// the buffer will be resized as needed.
/// all "direct" operations have to leave the buffer with trailing '\0'
/// at the end. endWrite() will search for this value in order to determine
/// new string length.
/// <P>Sample:<CODE>
/// SString t;
/// sprintf(t.directWrite(50),"a=%d,b=%f",a,b);
/// t.endWrite();</CODE>
char *directWrite(int ensuresize=-1);
//char *directWrite();
/// like directWrite, but it returns the pointer to the first char after current string
/// for easy appending. <B>maxappend</B> is minimum of character in buffer
/// that can be appended after this call.
/// <P>Sample:<CODE>
/// SString t;
/// sprintf(t.directAppend(10),"c=%d",c);
/// t.endAppend();</CODE>
char *directAppend(int maxappend=0);
/// update string length, after directWrite.
/// you don't have to to call endWrite after directWrite if the string's length doesn't change.
/// optional <B>newlength</B> parameter gives a chance to further optimize
/// this operation if you know exact length of resulting string.
/// <P>Sample:<CODE>
/// SString t("samplestring");
/// strncpy(t.directWrite(50),src,bytecount);
/// t.endWrite(bytecount);</CODE>
void endWrite(int newlength=-1);
/// update string length, after directAppend.
/// you will usually need to call endAppend (or endWrite) after directAppend,
/// because the purpose of directAppend is to change string's length.
/// optional <B>appendlength</B> parameter gives a chance to further optimize
/// this operation if you know exact length of the appended string.
/// <P>Sample:<CODE>
/// SString t("samplestring");
/// strncpy(t.directAppend(50),src,bytecount);
/// t.endAppend(bytecount);</CODE>
void endAppend(int appendlength=-1);

void memoryHint(int howbig) {ensureSize(howbig);}
int directMaxLen() {return size-1;} ///< when called after directWrite: max number of characters allowed (can be more than requested)

/// find a character in SString.
/// return index if the character was found or -1 otherwise.
int indexOf(int character,int start=0) const;

/// find a substring.
/// return index if the substring was found or -1 otherwise.
int indexOf(const char *substring,int start=0) const;

/// find a substring.
/// return index if the substring was found or -1 otherwise.
int indexOf(const SString & substring,int start=0) const;

const char* c_str() const {return getPtr();} ///< get SString's readonly buffer
void operator=(const char*t); ///< assign from const char*
void operator=(const SString &s);

void append(const char *t,int n);
SString operator+(const SString &s) const;
void operator+=(int x); ///< append x spaces after current string
void operator+=(const char*); ///< append char* contents
void operator+=(const SString&); ///< append other SString

int equals(const SString &s) const; ///< TRUE if equal
int operator==(const SString &s) const {return equals(s);} ///< TRUE if equal
int operator!=(const SString &s) const {return !equals(s);} ///< TRUE if not equal
bool operator<(const SString &s) const {return strcmp(getPtr(),s.getPtr())<1;}
const char* operator()(int p) const {return getPtr()+p;} ///< pointer to p'th character in SString
char operator[](int i) const {return getPtr()[i];} ///< get char like in array

/// return a substring of the current string
SString substr(int begin, int length=1<<30) const;

/// simple tokenization:
/// starting at <B>pos</B>, get next substring delimited by <B>separator</B> character
/// and put it in output parameter <B>token</B>.
/// <B>pos</B> is moved accordingly.
/// returns <B>false</B> if no more tokens are available or <B>true</B> otherwise.
int getNextToken(int& pos,SString &token,char separator) const;

void operator+=(char ch) {directAppend(1)[0]=ch;endAppend(1);} ///< append single character

int startsWith(const char *pattern) const;
char charAt(int pos) const {return operator[](pos);}
uint32_t hash() const;

static SString valueOf(int);
static SString valueOf(long);
static SString valueOf(double);
static SString valueOf(const SString&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
static SString valueOf(const ExtValue&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
static SString valueOf(const ExtObject&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
static SString sprintf(const char* format, ...);

static SString &empty();
};

#endif