#include "StringTools.h"
#include <sstream>

std::string StringTools::Replace(const std::string& str, const char find, const std::string& subst) {
      std::stringstream ss;

          for (std::size_t i = 0; i < str.length(); i++)
                {
                          if (str[i] != find)
                                        ss << str[i];
                                  else
                                                ss << subst;
                                      }

              return ss.str();
}

std::string StringTools::Replace(const std::string& str, const std::string& find, const std::string& subst) {
      if (find.length() == 0)
                return str;

          std::stringstream ss;

              std::size_t posFound = 0;
                  std::size_t lastFound = 0;

                      while (posFound != std::string::npos)
                            {
                                      lastFound = posFound;
                                              posFound = str.find(find, posFound);

                                                      if (posFound != std::string::npos)
                                                                {
                                                                              ss << str.substr(lastFound, posFound - lastFound) << subst;
                                                                                          posFound += find.length();
                                                                                                  }
                                                              else
                                                                        {
                                                                                      ss << str.substr(lastFound, (str.length()) - lastFound);
                                                                                              }
                                                                  }

                          return ss.str();
}

std::string StringTools::Replace(const std::string& str, const char find, const char subst) {
      std::stringstream ss;
          ss << subst;

              return Replace(str, find, ss.str());
}

std::string StringTools::Replace(const std::string& str, const std::string& find, const char subst) {
      std::stringstream ss;
          ss << subst;

              return Replace(str, find, ss.str());
}

std::string StringTools::Lower(const std::string& str) {
      std::stringstream ss;

          for (std::size_t i = 0; i < str.size(); i++)
                {
                          const char c = str[i];

                                  // Quick-accept: regular letters
                                  if ((c >= 'A') && (c <= 'Z'))
                                                ss << (char)(c | 32);

                                              // Else: keep the character as is
                                          else ss << c;
                                              }

              return ss.str();
}

std::string StringTools::Upper(const std::string& str) {
      std::stringstream ss;

          for (std::size_t i = 0; i < str.size(); i++)
                {
                          const char c = str[i];

                                  // Quick-accept: regular letters
                                  if ((c >= 'a') && (c <= 'z'))
                                                ss << (char)(c & ~32);

                                              // Else: keep the character as is
                                          else ss << c;
                                              }

              return ss.str();
}

std::vector<std::string> StringTools::Split(const std::string& str, const std::string& seperator) {
      std::vector<std::string> toRet;
          // Quick-accept: str length is 0
          if (str.length() == 0)
                  toRet.push_back("");

              // Quick-accept: seperator length is 0
              else if (seperator.length() == 0) {
                      for (const char c : str)
                                toRet.push_back(std::string(&c, (&c) + 1));
                          }

                  else {
                          std::size_t idx = 0;
                                while (idx != std::string::npos) {
                                          std::size_t lastIdx = idx;
                                                  idx = str.find(seperator, idx);

                                                          // Grab our substring until the next finding of sep
                                                          if (idx != std::string::npos) {
                                                                      toRet.push_back(str.substr(
                                                                                        lastIdx,
                                                                                                    idx - lastIdx
                                                                                                              ));

                                                                                idx += seperator.length();
                                                                                        }
                                                                  // No more seperator found. Grab the rest until the end of the string
                                                                  else {
                                                                              toRet.push_back(str.substr(
                                                                                                 lastIdx
                                                                                                           ));
                                                                                      }
                                                                        }
                                    }

                      return toRet;
}

std::string StringTools::PadLeft(const std::string& str, const char pad, const std::size_t len) {
    std::stringstream ss;

      for (std::size_t i = str.length(); i < len; i++)
            ss << pad;

        ss << str;

          return ss.str();
}

std::string StringTools::PadRight(const std::string& str, const char pad, const std::size_t len) {
    std::stringstream ss;

      ss << str;

        for (std::size_t i = str.length(); i < len; i++)
              ss << pad;

          return ss.str();
}