#pragma once

#include <Arduino.h>
#include <sys/time.h>

#include "clock_model.h"
#include "event_bus.h"
#include "service.h"
#include "settings.h"

namespace roro {

// Holds wall-clock time. Sources (GNSS in M2, NTP in M1, mesh in M4) call set().
class ClockService : public Service {
   public:
    ClockService(const Settings& settings, EventBus& bus) : settings_(settings) {
        bus.subscribe(EventType::SettingChanged, [this](const Event& e) {
            if (e.a == static_cast<int32_t>(Setting::Timezone)) applyTimezone();
        });
    }
    const char* name() const override { return "clock"; }
    void start() override { applyTimezone(); }

    bool set(int64_t utcSeconds, TimeSource source) {
        if (!model_.set(utcSeconds, source, millis())) return false;
        // The system's own clock too (F1, Q137): the card's files are dated from it, and NTP was
        // the only thing setting it. NTP has just done so itself.
        if (source != TimeSource::Ntp) {
            timeval now = {static_cast<time_t>(utcSeconds), 0};
            settimeofday(&now, nullptr);
        }
        return true;
    }
    const ClockModel& model() const { return model_; }

    // UTC seconds, or -1 if the clock isn't set.
    int64_t utcNow() const { return model_.isSet() ? model_.utcNow(millis()) : -1; }

    // Local "YYYY-MM-DD" once set; otherwise empty (Logs then go to undated files).
    std::string localDate() const { return model_.isSet() ? ClockModel::formatLocalDate(model_.utcNow(millis())) : ""; }
    // Days since 1970-01-01 (UTC), or -1 if the clock isn't set.
    int today() const { return model_.isSet() ? static_cast<int>(model_.utcNow(millis()) / 86400) : -1; }

    // "14:05" once set; otherwise "--:--".
    std::string displayTime() const {
        return model_.isSet() ? ClockModel::formatLocalTime(model_.utcNow(millis())) : "--:--";
    }

   private:
    void applyTimezone() { ClockModel::applyTimezone(settings_.getString(Setting::Timezone).c_str()); }

    const Settings& settings_;
    ClockModel model_;
};

}  // namespace roro