#ifndef VTR_UTIL_H
#define VTR_UTIL_H

#include <vector>
#include <string>
#include <cstdarg>
#include <array>

namespace vtr {

//Splits the string 'text' along the specified delimiter characters in 'delims'
//The split strings (excluding the delimiters) are returned
std::vector<std::string> split(const char* text, const std::string delims = " \t\n");
std::vector<std::string> split(const std::string& text, const std::string delims = " \t\n");

//Returns 'input' with the first instance of 'search' replaced with 'replace'
std::string replace_first(const std::string& input, const std::string& search, const std::string& replace);

//Returns 'input' with all instances of 'search' replaced with 'replace'
std::string replace_all(const std::string& input, const std::string& search, const std::string& replace);

//Retruns true if str starts with prefix
bool starts_with(std::string str, std::string prefix);

//Returns a std::string formatted using a printf-style format string
std::string string_fmt(const char* fmt, ...);

//Returns a std::string formatted using a printf-style format string taking
//an explicit va_list
std::string vstring_fmt(const char* fmt, va_list args);

//Joins a sequence by a specified delimeter
//  For example the sequence {"home", "user", "my_files", "test.blif"} with delim="/"
//  would return "home/user/my_files/test.blif"
template<typename Iter>
std::string join(Iter begin, Iter end, std::string delim);

template<typename Container>
std::string join(Container container, std::string delim);

template<typename T>
std::string join(std::initializer_list<T> list, std::string delim);

/*
 * Legacy c-style function replacements, typically these add extra error checking
 * and/or correct 'unexpected' behaviour of the standard c-functions
 */
constexpr size_t bufsize = 32768; /* Maximum line length for various parsing proc. */
char* strncpy(char* dest, const char* src, size_t size);
char* strdup(const char* str);
char* strtok(char* ptr, const char* tokens, FILE* fp, char* buf);
FILE* fopen(const char* fname, const char* flag);
int fclose(FILE* f);
char* fgets(char* buf, int max_size, FILE* fp);

int atoi(const std::string& value);
unsigned atou(const std::string& value);
float atof(const std::string& value);
double atod(const std::string& value);

/*
 * File utilities
 */
int get_file_line_number_of_last_opened_file();
bool file_exists(const char* filename);
bool check_file_name_extension(const char* file_name,
                               const char* file_extension);

extern std::string out_file_prefix;

/*
 * Legacy ReadLine Tokening
 */
std::vector<std::string> ReadLineTokens(FILE* InFile, int* LineNum);

/*
 * Template implementations
 */
template<typename Iter>
std::string join(Iter begin, Iter end, std::string delim) {
    std::string joined_str;
    for (auto iter = begin; iter != end; ++iter) {
        joined_str += *iter;
        if (iter != end - 1) {
            joined_str += delim;
        }
    }
    return joined_str;
}

template<typename Container>
std::string join(Container container, std::string delim) {
    return join(std::begin(container), std::end(container), delim);
}

template<typename T>
std::string join(std::initializer_list<T> list, std::string delim) {
    return join(list.begin(), list.end(), delim);
}
} // namespace vtr

#endif