#include "time_stamp.h"
#include <cstdio>
#include <cstdarg>
#include <memory>
#include <string>

timestamp_t::timestamp_t(int s, int e)
    : start(s), end(e) {}

timestamp_t& timestamp_t::operator=(const timestamp_t& a) {
    if (this != &a) {
        start = a.start;
        end = a.end;
    }
    return *this;
}

bool timestamp_t::operator==(const timestamp_t& a) const {
    return (start == a.start && end == a.end);
}

std::string timestamp_t::c_str() const {
    return format("{start:%08d, end:%08d}", start, end);
}

std::string timestamp_t::format(const char* fmt, ...) const {
    char buf[256];
    va_list args;
    va_start(args, fmt);
    const auto r = std::vsnprintf(buf, sizeof(buf), fmt, args);
    va_end(args);

    if (r < 0)
        return {};

    const size_t len = r;
    if (len < sizeof(buf))
        return std::string(buf, len);

#if __cplusplus >= 201703L
    std::string s(len + 1, '\0');
    va_start(args, fmt);
    std::vsnprintf(s.data(), len + 1, fmt, args);
    va_end(args);
    return s;
#else
    std::unique_ptr<char[]> vbuf(new char[len + 1]);
    va_start(args, fmt);
    std::vsnprintf(vbuf.get(), len + 1, fmt, args);
    va_end(args);
    return std::string(vbuf.get(), len);
#endif
}