// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include "common/logging/log.h"
#include "core/core_timing.h"
#include "core/hle/ipc_helpers.h"
#include "core/hle/kernel/event.h"
#include "core/hle/kernel/hle_ipc.h"
#include "core/hle/service/audio/audren_u.h"

namespace Service {
namespace Audio {

/// TODO(bunnei): Find a proper value for the audio_ticks
constexpr u64 audio_ticks{static_cast<u64>(BASE_CLOCK_RATE / 200)};

class IAudioRenderer final : public ServiceFramework<IAudioRenderer> {
public:
    IAudioRenderer() : ServiceFramework("IAudioRenderer") {
        static const FunctionInfo functions[] = {
            {0x0, nullptr, "GetAudioRendererSampleRate"},
            {0x1, nullptr, "GetAudioRendererSampleCount"},
            {0x2, nullptr, "GetAudioRendererMixBufferCount"},
            {0x3, nullptr, "GetAudioRendererState"},
            {0x4, &IAudioRenderer::RequestUpdateAudioRenderer, "RequestUpdateAudioRenderer"},
            {0x5, &IAudioRenderer::StartAudioRenderer, "StartAudioRenderer"},
            {0x6, &IAudioRenderer::StopAudioRenderer, "StopAudioRenderer"},
            {0x7, &IAudioRenderer::QuerySystemEvent, "QuerySystemEvent"},
            {0x8, nullptr, "SetAudioRendererRenderingTimeLimit"},
            {0x9, nullptr, "GetAudioRendererRenderingTimeLimit"},
        };
        RegisterHandlers(functions);

        system_event =
            Kernel::Event::Create(Kernel::ResetType::OneShot, "IAudioRenderer:SystemEvent");

        // Register event callback to update the Audio Buffer
        audio_event = CoreTiming::RegisterEvent(
            "IAudioRenderer::UpdateAudioCallback", [this](u64 userdata, int cycles_late) {
                UpdateAudioCallback();
                CoreTiming::ScheduleEvent(audio_ticks - cycles_late, audio_event);
            });

        // Start the audio event
        CoreTiming::ScheduleEvent(audio_ticks, audio_event);
    }
    ~IAudioRenderer() = default;

private:
    void UpdateAudioCallback() {
        system_event->Signal();
    }

    void RequestUpdateAudioRenderer(Kernel::HLERequestContext& ctx) {
        LOG_DEBUG(Service_Audio, "%s", ctx.Description().c_str());
        AudioRendererResponseData response_data{};

        response_data.section_0_size =
            response_data.state_entries.size() * sizeof(AudioRendererStateEntry);
        response_data.section_1_size = response_data.section_1.size();
        response_data.section_2_size = response_data.section_2.size();
        response_data.section_3_size = response_data.section_3.size();
        response_data.section_4_size = response_data.section_4.size();
        response_data.section_5_size = response_data.section_5.size();
        response_data.total_size = sizeof(AudioRendererResponseData);

        for (unsigned i = 0; i < response_data.state_entries.size(); i++) {
            // 4 = Busy and 5 = Ready?
            response_data.state_entries[i].state = 5;
        }

        ctx.WriteBuffer(&response_data, response_data.total_size);

        IPC::ResponseBuilder rb{ctx, 2};

        rb.Push(RESULT_SUCCESS);

        LOG_WARNING(Service_Audio, "(STUBBED) called");
    }

    void StartAudioRenderer(Kernel::HLERequestContext& ctx) {
        IPC::ResponseBuilder rb{ctx, 2};

        rb.Push(RESULT_SUCCESS);

        LOG_WARNING(Service_Audio, "(STUBBED) called");
    }

    void StopAudioRenderer(Kernel::HLERequestContext& ctx) {
        IPC::ResponseBuilder rb{ctx, 2};

        rb.Push(RESULT_SUCCESS);

        LOG_WARNING(Service_Audio, "(STUBBED) called");
    }

    void QuerySystemEvent(Kernel::HLERequestContext& ctx) {
        // system_event->Signal();

        IPC::ResponseBuilder rb{ctx, 2, 1};
        rb.Push(RESULT_SUCCESS);
        rb.PushCopyObjects(system_event);

        LOG_WARNING(Service_Audio, "(STUBBED) called");
    }

    struct AudioRendererStateEntry {
        u32_le state;
        u32_le unknown_4;
        u32_le unknown_8;
        u32_le unknown_c;
    };
    static_assert(sizeof(AudioRendererStateEntry) == 0x10,
                  "AudioRendererStateEntry has wrong size");

    struct AudioRendererResponseData {
        u32_le unknown_0;
        u32_le section_5_size;
        u32_le section_0_size;
        u32_le section_1_size;
        u32_le unknown_10;
        u32_le section_2_size;
        u32_le unknown_18;
        u32_le section_3_size;
        u32_le section_4_size;
        u32_le unknown_24;
        u32_le unknown_28;
        u32_le unknown_2c;
        u32_le unknown_30;
        u32_le unknown_34;
        u32_le unknown_38;
        u32_le total_size;

        std::array<AudioRendererStateEntry, 0x18e> state_entries;

        std::array<u8, 0x600> section_1;
        std::array<u8, 0xe0> section_2;
        std::array<u8, 0x20> section_3;
        std::array<u8, 0x10> section_4;
        std::array<u8, 0xb0> section_5;
    };
    static_assert(sizeof(AudioRendererResponseData) == 0x20e0,
                  "AudioRendererResponseData has wrong size");

    /// This is used to trigger the audio event callback.
    CoreTiming::EventType* audio_event;

    Kernel::SharedPtr<Kernel::Event> system_event;
};

AudRenU::AudRenU() : ServiceFramework("audren:u") {
    static const FunctionInfo functions[] = {
        {0, &AudRenU::OpenAudioRenderer, "OpenAudioRenderer"},
        {1, &AudRenU::GetAudioRendererWorkBufferSize, "GetAudioRendererWorkBufferSize"},
        {2, &AudRenU::GetAudioRenderersProcessMasterVolume, "GetAudioRenderersProcessMasterVolume"},
        {3, nullptr, "SetAudioRenderersProcessMasterVolume"},
    };
    RegisterHandlers(functions);
}

void AudRenU::OpenAudioRenderer(Kernel::HLERequestContext& ctx) {
    IPC::ResponseBuilder rb{ctx, 2, 0, 1};

    rb.Push(RESULT_SUCCESS);
    rb.PushIpcInterface<Audio::IAudioRenderer>();

    LOG_DEBUG(Service_Audio, "called");
}

void AudRenU::GetAudioRendererWorkBufferSize(Kernel::HLERequestContext& ctx) {
    IPC::ResponseBuilder rb{ctx, 4};

    rb.Push(RESULT_SUCCESS);
    rb.Push<u64>(0x400);

    LOG_WARNING(Service_Audio, "(STUBBED) called");
}

void AudRenU::GetAudioRenderersProcessMasterVolume(Kernel::HLERequestContext& ctx) {
    IPC::ResponseBuilder rb{ctx, 3};

    rb.Push(RESULT_SUCCESS);
    rb.Push<u32>(100);
    LOG_WARNING(Service_Audio, "(STUBBED) called");
}

} // namespace Audio
} // namespace Service