// Copyright 2019 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include "core/core.h"
#include "core/core_timing.h"
#include "core/core_timing_util.h"
#include "core/hle/service/time/clock_types.h"
#include "core/hle/service/time/steady_clock_core.h"
#include "core/hle/service/time/time_sharedmemory.h"

namespace Service::Time {

static constexpr std::size_t SHARED_MEMORY_SIZE{0x1000};

SharedMemory::SharedMemory(Core::System& system) : system(system) {
    shared_memory_holder = Kernel::SharedMemory::Create(
        system.Kernel(), nullptr, SHARED_MEMORY_SIZE, Kernel::MemoryPermission::ReadWrite,
        Kernel::MemoryPermission::Read, 0, Kernel::MemoryRegion::BASE, "Time:SharedMemory");
    std::memset(shared_memory_holder->GetPointer(), 0, SHARED_MEMORY_SIZE);
}

SharedMemory::~SharedMemory() = default;

std::shared_ptr<Kernel::SharedMemory> SharedMemory::GetSharedMemoryHolder() const {
    return shared_memory_holder;
}

void SharedMemory::SetupStandardSteadyClock(Core::System& system,
                                            const Common::UUID& clock_source_id,
                                            Clock::TimeSpanType current_time_point) {
    const Clock::TimeSpanType ticks_time_span{Clock::TimeSpanType::FromTicks(
        Core::Timing::CpuCyclesToClockCycles(system.CoreTiming().GetTicks()),
        Core::Timing::CNTFREQ)};
    const Clock::SteadyClockContext context{
        static_cast<u64>(current_time_point.nanoseconds - ticks_time_span.nanoseconds),
        clock_source_id};
    shared_memory_format.standard_steady_clock_timepoint.StoreData(
        shared_memory_holder->GetPointer(), context);
}

void SharedMemory::UpdateLocalSystemClockContext(const Clock::SystemClockContext& context) {
    shared_memory_format.standard_local_system_clock_context.StoreData(
        shared_memory_holder->GetPointer(), context);
}

void SharedMemory::UpdateNetworkSystemClockContext(const Clock::SystemClockContext& context) {
    shared_memory_format.standard_network_system_clock_context.StoreData(
        shared_memory_holder->GetPointer(), context);
}

void SharedMemory::SetAutomaticCorrectionEnabled(bool is_enabled) {
    shared_memory_format.standard_user_system_clock_automatic_correction.StoreData(
        shared_memory_holder->GetPointer(), is_enabled);
}

} // namespace Service::Time