Chain.cpp

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#include "Chain.hpp"
 
#include "MayaFlux/Kriya/Awaiters/DelayAwaiters.hpp"
#include "MayaFlux/Vruta/ChronUtils.hpp"
#include "MayaFlux/Vruta/Scheduler.hpp"
 
#include "MayaFlux/Journal/Archivist.hpp"
 
namespace MayaFlux::Kriya {
 
EventChain::EventChain(Vruta::TaskScheduler& scheduler, std::string name, Vruta::ProcessingToken token)
    : m_Scheduler(scheduler)
    , m_name(std::move(name))
    , m_token(token)
    , m_default_rate(scheduler.get_rate(token))
{
}
 
EventChain& EventChain::then(std::function<void()> action, double delay_seconds)
{
    m_events.push_back({ .action = std::move(action), .delay_seconds = delay_seconds });
    return *this;
}
 
EventChain& EventChain::repeat(size_t count)
{
    if (m_events.empty() || count == 0)
        return *this;
 
    auto last_event = m_events.back();
 
    for (size_t i = 0; i < count; ++i) {
        m_events.push_back(last_event);
    }
 
    return *this;
}
 
EventChain& EventChain::times(size_t count)
{
    m_repeat_count = count;
    return *this;
}
 
EventChain& EventChain::wait(double delay_seconds)
{
    return then([]() { }, delay_seconds);
}
 
EventChain& EventChain::every(double interval_seconds, std::function<void()> action)
{
    return then(std::move(action), interval_seconds);
}
 
void EventChain::start()
{
    if (m_events.empty())
        return;
 
    auto s_coro_func = [](std::vector<TimedEvent> events,
                           uint64_t rate,
                           size_t repeat_count) -> MayaFlux::Vruta::SoundRoutine {
        auto& promise = co_await Kriya::GetAudioPromise {};
 
        for (size_t iteration = 0; iteration < repeat_count; ++iteration) {
            for (const auto& event : events) {
                if (promise.should_terminate) {
                    break;
                }
 
                co_await SampleDelay { Vruta::seconds_to_samples(event.delay_seconds, rate) };
                try {
                    if (event.action) {
                        event.action();
                    }
                } catch (const std::exception& e) {
                    MF_RT_ERROR(
                        Journal::Component::Kriya,
                        Journal::Context::CoroutineScheduling,
                        "Exception in EventChain action: {}", e.what());
                } catch (...) {
                    MF_RT_ERROR(
                        Journal::Component::Kriya,
                        Journal::Context::CoroutineScheduling,
                        "Unknown exception in EventChain action");
                }
            }
 
            if (promise.should_terminate) {
                break;
            }
        }
    };
 
    auto g_coro_func = [](std::vector<TimedEvent> events,
                           uint64_t rate,
                           size_t repeat_count) -> MayaFlux::Vruta::GraphicsRoutine {
        auto& promise = co_await Kriya::GetGraphicsPromise {};
 
        for (size_t iteration = 0; iteration < repeat_count; ++iteration) {
            for (const auto& event : events) {
                if (promise.should_terminate) {
                    break;
                }
 
                co_await FrameDelay { Vruta::seconds_to_frames(event.delay_seconds, rate) };
                try {
                    if (event.action) {
                        event.action();
                    }
                } catch (const std::exception& e) {
                    MF_RT_ERROR(
                        Journal::Component::Kriya,
                        Journal::Context::CoroutineScheduling,
                        "Exception in EventChain action: {}", e.what());
                } catch (...) {
                    MF_RT_ERROR(
                        Journal::Component::Kriya,
                        Journal::Context::CoroutineScheduling,
                        "Unknown exception in EventChain action");
                }
            }
 
            if (promise.should_terminate) {
                break;
            }
        }
    };
 
    std::string task_name = m_name.empty() ? "EventChain_" + std::to_string(m_Scheduler.get_next_task_id()) : m_name;
 
    if (m_token == Vruta::ProcessingToken::SAMPLE_ACCURATE) {
        m_routine = std::make_shared<Vruta::SoundRoutine>(
            s_coro_func(m_events, m_default_rate, m_repeat_count));
    } else {
        m_routine = std::make_shared<Vruta::GraphicsRoutine>(
            g_coro_func(m_events, m_default_rate, m_repeat_count));
    }
 
    if (m_on_complete) {
        m_routine->on_complete(m_on_complete);
    }
 
    m_Scheduler.add_task(m_routine, task_name, true);
}
 
void EventChain::cancel()
{
    if (!is_active()) {
        return;
    }
 
    auto routine = std::exchange(m_routine, nullptr);
    routine->set_should_terminate(true);
    m_Scheduler.cancel_task(routine);
}
 
bool EventChain::is_active() const
{
    return m_routine && m_routine->is_active();
}
 
EventChain& EventChain::on_complete(std::function<void()> callback)
{
    m_on_complete = std::move(callback);
    return *this;
}
 
}