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#include <iostream>
#include <string>
#include <ctype.h>
#include <stdexcept>
#include "wrapregex.h"
#include "contexthandler.h"

using namespace std;

WrapRegex::WrapRegex(
  const string& pattern,
  bool matchCase,
  const string& replaceParameter,
  const int arrayLengthParameter) :
    replace(replaceParameter),
    arrayLength(arrayLengthParameter)
{
  if (pattern.empty() || pattern == ".*")
  {
    disabled = true;
    return;
  }
  disabled = false;

  matchArray = new int[arrayLength];

  // compile
  int optionsFlag = (matchCase) ? PCRE_UTF8 : PCRE_CASELESS | PCRE_UTF8;
  const char *errorPointer;
  int errorOffset;

  if ((patternStructure = pcre_compile(
      pattern.c_str(),
      optionsFlag,
      &errorPointer,
      &errorOffset,
      NULL)) == NULL)
  {
    throw runtime_error(errorPointer);
  }
    
  patternExtraStructure = pcre_study(patternStructure, 0, &errorPointer);
}

WrapRegex::~WrapRegex()
{
  if (disabled)
    return;

  try {
      pcre_free(patternStructure);
      pcre_free(patternExtraStructure);
      delete[] matchArray;
  }
  catch (...)
  {
    throw runtime_error("Wrapregex::~WrapRegex");
  }
}

int WrapRegex::matchPatternGlobal(
  string &buffer,
  vector<ContextMatch> &matchVector,
  unsigned elementCount,
  int context)
{
  if (disabled)
    return 0;

  return matchPatternGlobal_(
    buffer.c_str(),
    buffer.size(),
    matchVector,
    elementCount,
    context);
}

string WrapRegex::replaceGlobal(
  const string& buffer,
  int *matchCount)
{
  *matchCount = 0;

  if (disabled)
    return buffer;

  char *s = (char *)buffer.c_str();

  string output, match;
  
  output.reserve(buffer.size());
  while ((returnValue = pcre_exec(
    patternStructure,
    patternExtraStructure,
    s,
    strlen(s),
    0,
    0,
    matchArray,
    arrayLength)) >= 0)
  {
    ++(*matchCount);
    
    output.append(s, matchArray[0]);

    match.clear();
    match.append(s + matchArray[0], matchArray[1] - matchArray[0]);
    output.append(getInterpolatedString_(s, (char *)replace.c_str()));
    s += matchArray[1];
  }
  output.append(s);
  return output;
}

int WrapRegex::matchPatternGlobal_(
  const char *buffer,
  size_t buflen,
  vector<ContextMatch> &matchVector,
  unsigned elementCount, 
  int context)
{
  if (disabled)
    return 0;

  char *s, *origin;
  int matchcount;
  size_t offset;
  ContextMatch match;

  s = origin = (char *)buffer;
  matchcount = 0;
  offset = 0;

  while ((returnValue = pcre_exec(
    patternStructure,
    patternExtraStructure,
    s,
    buflen,
    offset,
    0,
    matchArray,
    arrayLength)) >= 0)
  {
    ++matchcount;

    if (context)
    {
      match = ContextHandler::getContext(
        s + matchArray[0],
        matchArray[1] - matchArray[0],
        origin,
        context);
    }
    else
    {
      match.prelog = match.postlog = "";
      match.match.assign(s + matchArray[0], matchArray[1] - matchArray[0]);
    }
    
    // record element and offset information
    match.elementCount = elementCount;
    match.offset = matchArray[0];

    if (replace != "")
      match.replace = getInterpolatedString_(s, (char *)replace.c_str());

    matchVector.push_back(match);

    if ((offset = matchArray[1]) >= buflen)
      break;
  }
  return matchcount;
}

string WrapRegex::getInterpolatedString_(char *buffer, char *source)
{
  if (disabled)
    return "";

  char *s, *origin;
  s = origin = (char *)source;

  string interpol_string;

  int escapeState = false;
  for (; *s; ++s)
  {
    if (*s == '\\')
    {
      escapeState = (escapeState) ? false : true;
      if (escapeState)
      {
        if (isdigit(*(s + 1)))
        {
          char *number, *it;
          number = s + 1;
          for (it = number; *it && isdigit(*(it + 1)); ++it)
            ;
          size_t len = it - s;
          char *tmp = new char[len + 1];
          memcpy(tmp, number, sizeof(char) * len);
          *(tmp + len) = '\0';
          int i = atoi(tmp);
          delete[] tmp;
          
          interpol_string += getSubpattern_(buffer, i);
          
          s += len;
          escapeState = false;
        }
        else if (*(s + 1) == 't')
        {
          interpol_string += '\t';
          ++s;
          escapeState = false;
        }
        else if (*(s + 1) == 'n')
        {
          interpol_string += '\n';
          ++s;
          escapeState = false;
        }
        else
          interpol_string += *s;
      }
      else
        interpol_string += *s;
    }
    else
      interpol_string += *s;
  }
  return interpol_string;
}

string WrapRegex::getSubpattern_(char *s, unsigned subpattern)
{
  if (disabled)
    return "";

  const char *sub;
  int ret = pcre_get_substring(s, matchArray, returnValue, subpattern, &sub);
  if (ret == PCRE_ERROR_NOSUBSTRING || ret == PCRE_ERROR_NOMEMORY)
    return "";
  string subString(sub);
  pcre_free((char *)sub);
  return subString;
}