//
// ZoneMinder General Utility Functions, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
// 
// 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
// 

#ifndef ZM_UTILS_H
#define ZM_UTILS_H

#include <algorithm>
#include <chrono>
#include <ctime>
#include <functional>
#include <map>
#include <memory>
#include <stdexcept>
#include <string>
#include <sys/time.h>
#include <vector>

typedef std::vector<std::string> StringVector;

std::string Trim(const std::string &str, const std::string &char_set);
inline std::string TrimSpaces(const std::string &str) { return Trim(str, " \t"); }
std::string ReplaceAll(std::string str, const std::string& old_value, const std::string& new_value);
inline void StringToUpper(std::string &str) { std::transform(str.begin(), str.end(), str.begin(), ::toupper); }

StringVector Split(const std::string &str, char delim);
StringVector Split(const std::string &str, const std::string &delim, size_t limit = 0);
std::pair<std::string, std::string> PairSplit(const std::string &str, char delim);

std::string Join(const StringVector &values, const std::string &delim = ",");

inline bool StartsWith(const std::string &haystack, const std::string &needle) {
  return (haystack.substr(0, needle.length()) == needle);
}

template<typename... Args>
std::string stringtf(const std::string &format, Args... args) {
  int size = snprintf(nullptr, 0, format.c_str(), args...) + 1; // Extra space for '\0'
  if (size <= 0) {
    throw std::runtime_error("Error during formatting.");
  }
  std::unique_ptr<char[]> buf(new char[size]);
  snprintf(buf.get(), size, format.c_str(), args...);
  return std::string(buf.get(), buf.get() + size - 1); // We don't want the '\0' inside
}

std::string Base64Encode(const std::string &str);

void TimespecDiff(timespec *start, timespec *end, timespec *diff);
std::string TimevalToString(timeval tv);

extern unsigned int sse_version;
extern unsigned int neonversion;
void HwCapsDetect();
void *sse2_aligned_memcpy(void *dest, const void *src, size_t bytes);

void touch(const char *pathname);

namespace ZM {
//! std::make_unique implementation (TODO: remove this once C++14 is supported)
template<typename T, typename ...Args>
inline auto make_unique(Args &&...args) ->
typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T>>::type {
  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}

template<typename T>
inline auto make_unique(std::size_t size) ->
typename std::enable_if<std::is_array<T>::value && std::extent<T>::value == 0, std::unique_ptr<T>>::type {
  return std::unique_ptr<T>(new typename std::remove_extent<T>::type[size]());
}

template<typename T, typename... Args>
inline auto make_unique(Args &&...) ->
typename std::enable_if<std::extent<T>::value != 0, void>::type = delete;

template<class T, class Compare>
constexpr const T &clamp(const T &v, const T &lo, const T &hi, Compare comp) {
  return comp(v, lo) ? lo : comp(hi, v) ? hi : v;
}

template<class T>
constexpr const T &clamp(const T &v, const T &lo, const T &hi) {
  return clamp(v, lo, hi, std::less<T>{});
}
}

typedef std::chrono::microseconds Microseconds;
typedef std::chrono::milliseconds Milliseconds;
typedef std::chrono::seconds Seconds;
typedef std::chrono::minutes Minutes;
typedef std::chrono::hours Hours;

typedef std::chrono::steady_clock::time_point TimePoint;
typedef std::chrono::system_clock::time_point SystemTimePoint;

std::string UriDecode(const std::string &encoded);

class QueryParameter {
 public:
  explicit QueryParameter(std::string name) : name_(std::move(name)) {}

  const std::string &name() const { return name_; }
  const std::string &firstValue() const { return values_[0]; }

  const std::vector<std::string> &values() const { return values_; }
  size_t size() const { return values_.size(); }

  template<class T>
  void addValue(T &&value) { values_.emplace_back(std::forward<T>(value)); }
 private:
  std::string name_;
  std::vector<std::string> values_;
};

class QueryString {
 public:
  explicit QueryString(std::istream &input);

  size_t size() const { return parameters_.size(); }
  bool has(const char *name) const { return parameters_.find(std::string(name)) != parameters_.end(); }

  std::vector<std::string> names() const;

  const QueryParameter *get(const std::string &name) const;
  const QueryParameter *get(const char *name) const { return get(std::string(name)); };

 private:
  static std::string parseName(std::istream &input);
  static std::string parseValue(std::istream &input);

  std::map<std::string, std::unique_ptr<QueryParameter>> parameters_;
};
#endif // ZM_UTILS_H
