// 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 <algorithm>
#include <memory>

#include "dawn/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) {
    static constexpr DeviceDescriptor kDefaultDescriptor = {};
    if (descriptor == nullptr) {
        descriptor = &kDefaultDescriptor;
    }
    auto result = CreateDeviceInternal(descriptor);

    if (result.IsError()) {
        std::unique_ptr<ErrorData> errorData = result.AcquireError();
        // TODO(crbug.com/dawn/1122): Call callbacks only on wgpuInstanceProcessEvents
        callback(WGPURequestDeviceStatus_Error, nullptr, errorData->GetFormattedMessage().c_str(),
                 userdata);
        return;
    }

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

    WGPURequestDeviceStatus status =
        device == nullptr ? WGPURequestDeviceStatus_Unknown : WGPURequestDeviceStatus_Success;
    // TODO(crbug.com/dawn/1122): Call callbacks only on wgpuInstanceProcessEvents
    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