// Copyright 2018 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_native/Adapter.h"

#include "common/Constants.h"
#include "dawn_native/Device.h"
#include "dawn_native/Instance.h"
#include "dawn_native/ValidationUtils_autogen.h"

namespace dawn_native {

    AdapterBase::AdapterBase(InstanceBase* instance, wgpu::BackendType backend)
        : mInstance(instance), mBackend(backend) {
        mSupportedFeatures.EnableFeature(Feature::DawnNative);
        mSupportedFeatures.EnableFeature(Feature::DawnInternalUsages);
    }

    MaybeError AdapterBase::Initialize() {
        DAWN_TRY_CONTEXT(InitializeImpl(), "initializing adapter (backend=%s)", mBackend);
        DAWN_TRY_CONTEXT(
            InitializeSupportedFeaturesImpl(),
            "gathering supported features for \"%s\" - \"%s\" (vendorId=%#06x deviceId=%#06x "
            "backend=%s type=%s)",
            mName, mDriverDescription, mVendorId, mDeviceId, mBackend, mAdapterType);
        DAWN_TRY_CONTEXT(
            InitializeSupportedLimitsImpl(&mLimits),
            "gathering supported limits for \"%s\" - \"%s\" (vendorId=%#06x deviceId=%#06x "
            "backend=%s type=%s)",
            mName, mDriverDescription, mVendorId, mDeviceId, mBackend, mAdapterType);

        // Enforce internal Dawn constants.
        mLimits.v1.maxVertexBufferArrayStride =
            std::min(mLimits.v1.maxVertexBufferArrayStride, kMaxVertexBufferArrayStride);
        mLimits.v1.maxBindGroups = std::min(mLimits.v1.maxBindGroups, kMaxBindGroups);
        mLimits.v1.maxVertexAttributes =
            std::min(mLimits.v1.maxVertexAttributes, uint32_t(kMaxVertexAttributes));
        mLimits.v1.maxVertexBuffers =
            std::min(mLimits.v1.maxVertexBuffers, uint32_t(kMaxVertexBuffers));
        mLimits.v1.maxInterStageShaderComponents =
            std::min(mLimits.v1.maxInterStageShaderComponents, kMaxInterStageShaderComponents);
        mLimits.v1.maxSampledTexturesPerShaderStage = std::min(
            mLimits.v1.maxSampledTexturesPerShaderStage, kMaxSampledTexturesPerShaderStage);
        mLimits.v1.maxSamplersPerShaderStage =
            std::min(mLimits.v1.maxSamplersPerShaderStage, kMaxSamplersPerShaderStage);
        mLimits.v1.maxStorageBuffersPerShaderStage =
            std::min(mLimits.v1.maxStorageBuffersPerShaderStage, kMaxStorageBuffersPerShaderStage);
        mLimits.v1.maxStorageTexturesPerShaderStage = std::min(
            mLimits.v1.maxStorageTexturesPerShaderStage, kMaxStorageTexturesPerShaderStage);
        mLimits.v1.maxUniformBuffersPerShaderStage =
            std::min(mLimits.v1.maxUniformBuffersPerShaderStage, kMaxUniformBuffersPerShaderStage);
        mLimits.v1.maxDynamicUniformBuffersPerPipelineLayout =
            std::min(mLimits.v1.maxDynamicUniformBuffersPerPipelineLayout,
                     kMaxDynamicUniformBuffersPerPipelineLayout);
        mLimits.v1.maxDynamicStorageBuffersPerPipelineLayout =
            std::min(mLimits.v1.maxDynamicStorageBuffersPerPipelineLayout,
                     kMaxDynamicStorageBuffersPerPipelineLayout);

        return {};
    }

    bool AdapterBase::APIGetLimits(SupportedLimits* limits) const {
        return GetLimits(limits);
    }

    void AdapterBase::APIGetProperties(AdapterProperties* properties) const {
        properties->vendorID = mVendorId;
        properties->deviceID = mDeviceId;
        properties->name = mName.c_str();
        properties->driverDescription = mDriverDescription.c_str();
        properties->adapterType = mAdapterType;
        properties->backendType = mBackend;
    }

    bool AdapterBase::APIHasFeature(wgpu::FeatureName feature) const {
        return mSupportedFeatures.IsEnabled(feature);
    }

    size_t AdapterBase::APIEnumerateFeatures(wgpu::FeatureName* features) const {
        return mSupportedFeatures.EnumerateFeatures(features);
    }

    DeviceBase* AdapterBase::APICreateDevice(const DeviceDescriptor* descriptor) {
        DeviceDescriptor defaultDesc = {};
        if (descriptor == nullptr) {
            descriptor = &defaultDesc;
        }
        auto result = CreateDeviceInternal(descriptor);
        if (result.IsError()) {
            mInstance->ConsumedError(result.AcquireError());
            return nullptr;
        }
        return result.AcquireSuccess().Detach();
    }

    void AdapterBase::APIRequestDevice(const DeviceDescriptor* descriptor,
                                       WGPURequestDeviceCallback callback,
                                       void* userdata) {
        auto result = CreateDeviceInternal(descriptor);

        if (result.IsError()) {
            std::unique_ptr<ErrorData> errorData = result.AcquireError();
            callback(WGPURequestDeviceStatus_Error, nullptr,
                     errorData->GetFormattedMessage().c_str(), userdata);
            return;
        }

        Ref<DeviceBase> device = result.AcquireSuccess();

        WGPURequestDeviceStatus status =
            device == nullptr ? WGPURequestDeviceStatus_Unknown : WGPURequestDeviceStatus_Success;
        callback(status, ToAPI(device.Detach()), nullptr, userdata);
    }

    uint32_t AdapterBase::GetVendorId() const {
        return mVendorId;
    }

    uint32_t AdapterBase::GetDeviceId() const {
        return mDeviceId;
    }

    wgpu::BackendType AdapterBase::GetBackendType() const {
        return mBackend;
    }

    InstanceBase* AdapterBase::GetInstance() const {
        return mInstance;
    }

    FeaturesSet AdapterBase::GetSupportedFeatures() const {
        return mSupportedFeatures;
    }

    bool AdapterBase::SupportsAllRequiredFeatures(
        const ityp::span<size_t, const wgpu::FeatureName>& features) const {
        for (wgpu::FeatureName f : features) {
            if (!mSupportedFeatures.IsEnabled(f)) {
                return false;
            }
        }
        return true;
    }

    WGPUDeviceProperties AdapterBase::GetAdapterProperties() const {
        WGPUDeviceProperties adapterProperties = {};
        adapterProperties.deviceID = mDeviceId;
        adapterProperties.vendorID = mVendorId;
        adapterProperties.adapterType = static_cast<WGPUAdapterType>(mAdapterType);

        mSupportedFeatures.InitializeDeviceProperties(&adapterProperties);
        // This is OK for now because there are no limit feature structs.
        // If we add additional structs, the caller will need to provide memory
        // to store them (ex. by calling GetLimits directly instead). Currently,
        // we keep this function as it's only used internally in Chromium to
        // send the adapter properties across the wire.
        GetLimits(FromAPI(&adapterProperties.limits));
        return adapterProperties;
    }

    bool AdapterBase::GetLimits(SupportedLimits* limits) const {
        ASSERT(limits != nullptr);
        if (limits->nextInChain != nullptr) {
            return false;
        }
        if (mUseTieredLimits) {
            limits->limits = ApplyLimitTiers(mLimits.v1);
        } else {
            limits->limits = mLimits.v1;
        }
        return true;
    }

    ResultOrError<Ref<DeviceBase>> AdapterBase::CreateDeviceInternal(
        const DeviceDescriptor* descriptor) {
        ASSERT(descriptor != nullptr);

        for (uint32_t i = 0; i < descriptor->requiredFeaturesCount; ++i) {
            wgpu::FeatureName f = descriptor->requiredFeatures[i];
            DAWN_TRY(ValidateFeatureName(f));
            DAWN_INVALID_IF(!mSupportedFeatures.IsEnabled(f),
                            "Requested feature %s is not supported.", f);
        }

        if (descriptor->requiredLimits != nullptr) {
            DAWN_TRY_CONTEXT(
                ValidateLimits(mUseTieredLimits ? ApplyLimitTiers(mLimits.v1) : mLimits.v1,
                               descriptor->requiredLimits->limits),
                "validating required limits");

            DAWN_INVALID_IF(descriptor->requiredLimits->nextInChain != nullptr,
                            "nextInChain is not nullptr.");
        }
        return CreateDeviceImpl(descriptor);
    }

    void AdapterBase::SetUseTieredLimits(bool useTieredLimits) {
        mUseTieredLimits = useTieredLimits;
    }

    void AdapterBase::ResetInternalDeviceForTesting() {
        mInstance->ConsumedError(ResetInternalDeviceForTestingImpl());
    }

    MaybeError AdapterBase::ResetInternalDeviceForTestingImpl() {
        return DAWN_INTERNAL_ERROR(
            "ResetInternalDeviceForTesting should only be used with the D3D12 backend.");
    }

}  // namespace dawn_native