#pragma once

// Distributed under the LGPL v2.1 license.  See accompanying
// file LICENSE or https://github.com/henryiii/CLI11 for details.

#include <string>
#include <sstream>
#include <iomanip>
#include <locale>
#include <type_traits>
#include <algorithm>

namespace CLI {
namespace detail {


/// Simple function to join a string
template <typename T>
std::string join(const T& v, std::string delim = ",") {
    std::ostringstream s;
    size_t start = 0;
    for (const auto& i : v) {
        if(start++ > 0)
            s << delim;
        s << i;
    }
    return s.str();
}

// Based on http://stackoverflow.com/questions/25829143/c-trim-whitespace-from-a-string

/// Trim whitespace from left of string
std::string& ltrim(std::string &str) {
    auto it2 =  std::find_if( str.begin() , str.end() , [](char ch){ return !std::isspace<char>(ch , std::locale::classic() ) ; } );
    str.erase( str.begin() , it2);
    return str;   
}

/// Trim whitespace from right of string
std::string& rtrim(std::string &str) {
    auto it1 =  std::find_if( str.rbegin() , str.rend() , [](char ch){ return !std::isspace<char>(ch , std::locale::classic() ) ; } );
    str.erase( it1.base() , str.end() );
    return str;   
}

/// Trim whitespace from string
std::string& trim(std::string &str) {
    return ltrim(rtrim(str));
}

/// Make a copy of the string and then trim it
std::string trim_copy(const std::string &str) {
    std::string s = str;
    return ltrim(rtrim(s));
}

/// Print a two part "help" string
void format_help(std::stringstream &out, std::string name, std::string description, size_t wid) {
    name = "  " + name;
    out << std::setw(wid) << std::left << name;
    if(description != "") {
        if(name.length()>=wid)
            out << std::endl << std::setw(wid) << "";
        out << description;
    }
    out << std::endl;
}

/// Verify the first character of an option
template<typename T>
bool valid_first_char(T c) {
    return std::isalpha(c) || c=='_';
}

/// Verify following characters of an option
template<typename T>
bool valid_later_char(T c) {
    return std::isalnum(c) || c=='_' || c=='.' || c=='-';
}

/// Verify an option name
inline bool valid_name_string(const std::string &str) {
    if(str.size()<1 || !valid_first_char(str[0]))
        return false;
    for(auto c : str.substr(1))
        if(!valid_later_char(c))
            return false;
    return true;
}



}
}