#include <string>
#include <vector>
#include <fstream>
#include <cstdlib>
#include "util.hpp"
#include <sys/types.h>
#include <sys/stat.h>
#include <cmath>
#ifndef WIN32
#include <unistd.h>
#define stat _stat
#endif

namespace util {

stringvec split(const std::string &s, char sep) {
    stringvec result;
    int start = 0;
    for (int i = 0; i < int(s.size()); i++) {
        if (s[i] == sep) {
            result.push_back(s.substr(start, i-start));
            start = i+1;
        }
    }
    if (start < int(s.size())) {
        result.push_back(s.substr(start));
    }
    return result;
}

std::string tolower(std::string input) {
    for (int i = 0; i < int(input.size()); i++) {
        input[i] = std::tolower(input[i]);
    }
    return input;
}

std::string toupper(std::string input) {
    for (int i = 0; i < int(input.size()); i++) {
        input[i] = std::toupper(input[i]);
    }
    return input;
}

bool validinteger(const std::string &value) {
    char *endptr;
    strtoll(value.c_str(), &endptr, 10);
    return (endptr == value.c_str() + value.size());
}

int64_t strtoint(const std::string &value, int64_t errval) {
    char *endptr;
    int64_t result = strtoll(value.c_str(), &endptr, 10);
    if (endptr == value.c_str() + value.size()) {
        return result;
    } else {
        return errval;
    }
}

double strtodouble(const std::string &value) {
    char *endptr;
    double result = strtod(value.c_str(), &endptr);
    if (endptr == value.c_str() + value.size()) {
        return result;
    } else {
        return std::nan("");
    }
}

std::string ltrim(std::string s) {
    s.erase(s.begin(), std::find_if(s.begin(), s.end(),
            std::not1(std::ptr_fun<int, int>(std::isspace))));
    return s;
}

std::string rtrim(std::string s) {
    s.erase(std::find_if(s.rbegin(), s.rend(),
            std::not1(std::ptr_fun<int, int>(std::isspace))).base(), s.end());
    return s;
}

std::string trim(std::string s) {
    return ltrim(rtrim(s));
}


std::string get_file_contents(const std::string &fn) {
    std::ifstream fs(fn);
    std::stringstream buffer;
    buffer << fs.rdbuf();
    return buffer.str();
}

stringvec get_file_lines(const std::string &path) {
    stringvec result;
    std::ifstream f;
    f.open(path);
    if (f) {
        std::string line;
        while (std::getline(f, line)) {
            result.push_back(line);
        }
        f.close();
    }
    return result;
}

std::string get_file_fingerprint(const std::string &fn) {
    struct stat result;
    if(stat(fn.c_str(), &result)==0)
    {
        std::stringstream ss;
        ss << result.st_mtime;
        return ss.str();
    }
    return "";
}

double distance_squared(double x1, double y1, double x2, double y2) {
    double dx = x1 - x2;
    double dy = y1 - y2;
    return dx*dx + dy*dy;
}

std::string XYZ::debug_string() const {
    std::ostringstream oss;
    oss << "(" << x << "," << y << "," << z << ")";
    return oss.str();
}

} // namespace util