#ifndef UTIL_HPP
#define UTIL_HPP

#include <string>
#include <set>
#include <algorithm>
#include <sstream>
#include <ostream>
#include <tuple>
#include <utility>

namespace util {

using stringvec = std::vector<std::string>;
using stringset = std::set<std::string>;

// String to integer.  Returns errval if the number is not parseable.
int64_t strtoint(const std::string &value, int64_t errval);

// Trim strings: left end, right end, both ends.
std::string ltrim(std::string s);
std::string rtrim(std::string s);
std::string trim(std::string s);

// Read a file as one big string.
std::string get_file_contents(const std::string &path);

// Read a file as a vector of lines.
stringvec   get_file_lines(const std::string &path);

// Get a file's fingerprint - ie, size and modification time.
std::string get_file_fingerprint(const std::string &path);

// Calculate distance between two points
double distance_squared(double x1, double y1, double x2, double y2);

// Return a pseudorandom number which is a hash function of A,B,C.
uint32_t hash3(uint32_t a, uint32_t b, uint32_t c);

// Return a pseudorandom float between lo and hi inclusive.
double hash_to_float(double lo, double hi, uint32_t a, uint32_t b, uint32_t c);

// An XYZ coordinate, general purpose.
struct XYZ {
    float x, y, z;
    XYZ() { x=0; y=0; z=0; }
    XYZ(float ix, float iy, float iz) { x=ix; y=iy; z=iz; }
    bool operator ==(const XYZ &o) { return x==o.x && y == o.y && z==o.z; }
};
std::ostream & operator << (std::ostream &out, const XYZ &xyz);
  
} // namespace util
#endif // UTIL_HPP