#include "common/time_utils.hpp"
#include <iomanip>
#include <sstream>
#include <iostream>

namespace smartbotic::common {

int64_t TimeUtils::nowMs() {
    return std::chrono::duration_cast<std::chrono::milliseconds>(
        Clock::now().time_since_epoch()
    ).count();
}

int64_t TimeUtils::nowSec() {
    return std::chrono::duration_cast<std::chrono::seconds>(
        Clock::now().time_since_epoch()
    ).count();
}

TimeUtils::TimePoint TimeUtils::now() {
    return Clock::now();
}

TimeUtils::TimePoint TimeUtils::fromMs(int64_t ms) {
    return TimePoint(std::chrono::milliseconds(ms));
}

int64_t TimeUtils::toMs(TimePoint tp) {
    return std::chrono::duration_cast<std::chrono::milliseconds>(
        tp.time_since_epoch()
    ).count();
}

std::string TimeUtils::toIso8601(int64_t ms) {
    return toIso8601(fromMs(ms));
}

std::string TimeUtils::toIso8601(TimePoint tp) {
    auto time = Clock::to_time_t(tp);
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
        tp.time_since_epoch()
    ).count() % 1000;

    std::tm tm{};
    gmtime_r(&time, &tm);

    std::ostringstream ss;
    ss << std::put_time(&tm, "%Y-%m-%dT%H:%M:%S")
       << '.' << std::setfill('0') << std::setw(3) << ms << 'Z';

    return ss.str();
}

int64_t TimeUtils::parseIso8601(const std::string& str) {
    std::tm tm{};
    int ms = 0;

    std::istringstream ss(str);
    ss >> std::get_time(&tm, "%Y-%m-%dT%H:%M:%S");

    if (ss.peek() == '.') {
        ss.ignore();
        ss >> ms;
    }

    auto time = timegm(&tm);
    return static_cast<int64_t>(time) * 1000 + ms;
}

bool TimeUtils::isExpired(int64_t expiryMs) {
    return nowMs() > expiryMs;
}

bool TimeUtils::isExpired(TimePoint expiry) {
    return now() > expiry;
}

int64_t TimeUtils::addMs(int64_t timestampMs, int64_t durationMs) {
    return timestampMs + durationMs;
}

int64_t TimeUtils::addSec(int64_t timestampMs, int64_t durationSec) {
    return timestampMs + (durationSec * 1000);
}

// ScopedTimer implementation
ScopedTimer::ScopedTimer(const std::string& name)
    : name_(name), start_(TimeUtils::now()) {}

ScopedTimer::~ScopedTimer() {
    if (!name_.empty()) {
        std::cout << "[Timer] " << name_ << ": " << elapsedMs() << "ms" << std::endl;
    }
}

int64_t ScopedTimer::elapsedMs() const {
    return TimeUtils::toMs(TimeUtils::now()) - TimeUtils::toMs(start_);
}

void ScopedTimer::reset() {
    start_ = TimeUtils::now();
}

} // namespace smartbotic::common