#include <fcntl.h>
#include <unistd.h>

#include <array>
#include <cstdint>
#include <filesystem>
#include <format>
#include <log.hpp>
#include <string>
#include <string_view>
#include <utils.hpp>

namespace utils {

/* pads given string to length */
std::string pad(std::string s, const uint8_t len, just j) {
    if (len > s.size())
        s.insert(j == left ? s.end() : s.begin(), len - s.size(), fill_char);
    return s;
}

/* returns the string centered within given length */
std::string center(std::string str, const uint8_t len) {
    const uint8_t padding = len - str.size();
    str.insert(str.begin(), padding / 2, fill_char);
    str.insert(str.end(), padding / 2, fill_char);
    return str;
}

/* converts large number in (k)bytes to human-readable numer with suffix and sane decimal */
std::string pBytes(double bytes, const bool isKbytes) {
    for (constexpr std::array suffix_list = {'K', 'M', 'G', 'T', 'P', 'E', 'Z'}; const auto& suffix : suffix_list) {
        if (suffix == 'K' && isKbytes) continue;  // skip first loop if already in Kbytes
        bytes /= 1024.0;
        if (bytes < 1024) {
            if (bytes > 100) return pNum(bytes) + suffix;
            if (bytes > 10) return pNum(bytes, 1) + suffix;
            return pNum(bytes, 2) + suffix;
        }
    }
    return "++++";
}

/* reads maxlen of chars of the file in path into buffer */
ssize_t readFile(const char* path, char* buffer, size_t maxlen) {
    const int fd = open(path, O_RDONLY | O_CLOEXEC);
    if (fd < 0) {
        applog(LOG::ERR, "Error reading {}", path);
        return 0;
    }
    const ssize_t len = read(fd, buffer, maxlen - 1);
    if (len >= 0) buffer[len] = '\0';
    close(fd);
    return len;
}

/* overload so it takes std::string as path */
ssize_t readFile(const std::string& path, char* buffer, size_t maxlen) {
    return readFile(path.c_str(), buffer, maxlen);
}

/* finds first dir in path and returns it. don't refactor, you don't understand it, its fast enough, and you only use it on init */
std::string getFirstDir(const std::string_view& path) {
    for (const auto& entry : std::filesystem::directory_iterator(path))
        return entry.path();
    return "";
}

}