// Copyright 2021 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "dawn_wire/client/Adapter.h"

#include "common/Log.h"
#include "dawn_wire/client/Client.h"

namespace dawn_wire { namespace client {

    Adapter::~Adapter() {
        mRequestDeviceRequests.CloseAll([](RequestDeviceData* request) {
            request->callback(WGPURequestDeviceStatus_Unknown, nullptr,
                              "Adapter destroyed before callback", request->userdata);
        });
    }

    void Adapter::CancelCallbacksForDisconnect() {
        mRequestDeviceRequests.CloseAll([](RequestDeviceData* request) {
            request->callback(WGPURequestDeviceStatus_Unknown, nullptr, "GPU connection lost",
                              request->userdata);
        });
    }

    bool Adapter::GetLimits(WGPUSupportedLimits* limits) const {
        return mLimitsAndFeatures.GetLimits(limits);
    }

    bool Adapter::HasFeature(WGPUFeatureName feature) const {
        return mLimitsAndFeatures.HasFeature(feature);
    }

    uint32_t Adapter::EnumerateFeatures(WGPUFeatureName* features) const {
        return mLimitsAndFeatures.EnumerateFeatures(features);
    }

    void Adapter::SetLimits(const WGPUSupportedLimits* limits) {
        return mLimitsAndFeatures.SetLimits(limits);
    }

    void Adapter::SetFeatures(const WGPUFeatureName* features, uint32_t featuresCount) {
        return mLimitsAndFeatures.SetFeatures(features, featuresCount);
    }

    void Adapter::SetProperties(const WGPUAdapterProperties* properties) {
        mProperties = *properties;
        mProperties.nextInChain = nullptr;
    }

    void Adapter::GetProperties(WGPUAdapterProperties* properties) const {
        *properties = mProperties;
    }

    void Adapter::RequestDevice(const WGPUDeviceDescriptor* descriptor,
                                WGPURequestDeviceCallback callback,
                                void* userdata) {
        if (client->IsDisconnected()) {
            callback(WGPURequestDeviceStatus_Error, nullptr, "GPU connection lost", userdata);
            return;
        }

        auto* allocation = client->DeviceAllocator().New(client);
        uint64_t serial = mRequestDeviceRequests.Add({callback, allocation->object->id, userdata});

        AdapterRequestDeviceCmd cmd;
        cmd.adapterId = this->id;
        cmd.requestSerial = serial;
        cmd.deviceObjectHandle = ObjectHandle(allocation->object->id, allocation->generation);
        cmd.descriptor = descriptor;

        client->SerializeCommand(cmd);
    }

    bool Client::DoAdapterRequestDeviceCallback(Adapter* adapter,
                                                uint64_t requestSerial,
                                                WGPURequestDeviceStatus status,
                                                const char* message,
                                                const WGPUSupportedLimits* limits,
                                                uint32_t featuresCount,
                                                const WGPUFeatureName* features) {
        // May have been deleted or recreated so this isn't an error.
        if (adapter == nullptr) {
            return true;
        }
        return adapter->OnRequestDeviceCallback(requestSerial, status, message, limits,
                                                featuresCount, features);
    }

    bool Adapter::OnRequestDeviceCallback(uint64_t requestSerial,
                                          WGPURequestDeviceStatus status,
                                          const char* message,
                                          const WGPUSupportedLimits* limits,
                                          uint32_t featuresCount,
                                          const WGPUFeatureName* features) {
        RequestDeviceData request;
        if (!mRequestDeviceRequests.Acquire(requestSerial, &request)) {
            return false;
        }

        Device* device = client->DeviceAllocator().GetObject(request.deviceObjectId);

        // If the return status is a failure we should give a null device to the callback and
        // free the allocation.
        if (status != WGPURequestDeviceStatus_Success) {
            client->DeviceAllocator().Free(device);
            request.callback(status, nullptr, message, request.userdata);
            return true;
        }

        device->SetLimits(limits);
        device->SetFeatures(features, featuresCount);

        request.callback(status, ToAPI(device), message, request.userdata);
        return true;
    }

    WGPUDevice Adapter::CreateDevice(const WGPUDeviceDescriptor*) {
        dawn::ErrorLog() << "adapter.CreateDevice not supported with dawn_wire.";
        return nullptr;
    }

}}  // namespace dawn_wire::client