// Copyright 2025 The Dawn & Tint Authors
//
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#include "dawn/native/webgpu/TextureWGPU.h"

#include <algorithm>
#include <string>
#include <utility>
#include <vector>

#include "dawn/common/StringViewUtils.h"
#include "dawn/native/BlockInfo.h"
#include "dawn/native/webgpu/CaptureContext.h"
#include "dawn/native/webgpu/DeviceWGPU.h"
#include "dawn/native/webgpu/QueueWGPU.h"
#include "dawn/native/webgpu/Serialization.h"
#include "dawn/native/webgpu/ToWGPU.h"

namespace dawn::native::webgpu {

// static
ResultOrError<Ref<Texture>> Texture::Create(Device* device,
                                            const UnpackedPtr<TextureDescriptor>& descriptor) {
    return AcquireRef(new Texture(device, descriptor));
}

Texture::Texture(Device* device, const UnpackedPtr<TextureDescriptor>& descriptor)
    : TextureBase(device, descriptor),
      RecordableObject(schema::ObjectType::Texture),
      ObjectWGPU(device->wgpu.textureRelease) {
    wgpu::TextureUsage actualUsage = GetInternalUsage();
    // Resolve internal usages to regular ones
    if (actualUsage & kReadOnlyStorageTexture) {
        actualUsage &= ~kReadOnlyStorageTexture;
    }
    if (actualUsage & kWriteOnlyStorageTexture) {
        actualUsage &= ~kWriteOnlyStorageTexture;
    }
    if (actualUsage & kReadOnlyRenderAttachment) {
        actualUsage &= ~kReadOnlyRenderAttachment;
    }
    if (actualUsage & kResolveAttachmentLoadingUsage) {
        actualUsage &= ~kResolveAttachmentLoadingUsage;
    }
    if (!(actualUsage & wgpu::TextureUsage::TransientAttachment)) {
        actualUsage |= wgpu::TextureUsage::CopySrc;
    }
    std::vector<WGPUTextureFormat> viewFormats;
    viewFormats.reserve(GetViewFormats().size());
    for (FormatIndex i : GetViewFormats()) {
        viewFormats.push_back(ToAPI(device->GetValidInternalFormat(i).format));
    }

    WGPUTextureDescriptor desc = {
        .nextInChain = nullptr,
        .label = ToOutputStringView(GetLabel()),
        .usage = ToAPI(actualUsage),
        .dimension = ToAPI(GetDimension()),
        .size = ToWGPU(GetBaseSize()),
        .format = ToAPI(GetFormat().format),
        .mipLevelCount = GetNumMipLevels(),
        .sampleCount = GetSampleCount(),
        .viewFormatCount = viewFormats.size(),
        .viewFormats = viewFormats.data(),
    };

    mInnerHandle = device->wgpu.deviceCreateTexture(device->GetInnerHandle(), &desc);
    DAWN_ASSERT(mInnerHandle);
}

void Texture::DestroyImpl() {
    TextureBase::DestroyImpl();
    auto& wgpu = ToBackend(GetDevice())->wgpu;
    wgpu.textureDestroy(mInnerHandle);
}

void Texture::SetLabelImpl() {
    ToBackend(GetDevice())->CaptureSetLabel(this, GetLabel());
}

// TextureView

// static
ResultOrError<Ref<TextureView>> TextureView::Create(
    TextureBase* texture,
    const UnpackedPtr<TextureViewDescriptor>& descriptor) {
    Device* device = ToBackend(texture->GetDevice());
    auto* desc = ToAPI(*descriptor);

    WGPUTextureView innerView =
        device->wgpu.textureCreateView(ToBackend(texture)->GetInnerHandle(), desc);
    DAWN_ASSERT(innerView);

    return AcquireRef(new TextureView(texture, descriptor, innerView));
}

TextureView::TextureView(TextureBase* texture,
                         const UnpackedPtr<TextureViewDescriptor>& descriptor,
                         WGPUTextureView innerView)
    : TextureViewBase(texture, descriptor),
      RecordableObject(schema::ObjectType::TextureView),
      ObjectWGPU(ToBackend(texture->GetDevice())->wgpu.textureViewRelease) {
    mInnerHandle = innerView;
}

MaybeError Texture::AddReferenced(CaptureContext& captureContext) {
    // Textures do not reference other objects.
    return {};
}

MaybeError Texture::CaptureCreationParameters(CaptureContext& captureContext) {
    Device* device = ToBackend(GetDevice());
    std::vector<wgpu::TextureFormat> viewFormats;
    for (FormatIndex i : GetViewFormats()) {
        const Format& viewFormat = device->GetValidInternalFormat(i);
        viewFormats.emplace_back(viewFormat.baseFormat);
    }
    schema::Texture tex{{
        .usage = GetUsage(),
        .dimension = GetDimension(),
        .size = ToSchema(GetBaseSize()),
        .format = GetFormat().baseFormat,
        .mipLevelCount = GetNumMipLevels(),
        .sampleCount = GetSampleCount(),
        .viewFormats = viewFormats,
    }};
    Serialize(captureContext, tex);
    return {};
}

// TODO(451559917): Make this a helper for copying a texture to memory N bytes at a time.
// so that other parts of dawn can use it.
MaybeError Texture::CaptureContentIfNeeded(CaptureContext& captureContext,
                                           schema::ObjectId id,
                                           bool newResource) {
    // If it's all zeros we don't need to capture it.
    if (!IsInitialized()) {
        return {};
    }
    struct MapAsyncResult {
        WGPUMapAsyncStatus status;
        std::string message;
    } mapAsyncResult = {};

    // TODO(413053623): Support depth/stencil and multi-planar textures.
    // Also, this can't handle compressed textures on compat as they are not readable (no copyT2B)
    const TypedTexelBlockInfo& blockInfo = GetFormat().GetAspectInfo(Aspect::Color).block;
    WGPUBuffer copyBuffer = captureContext.GetCopyBuffer();

    Device* device = ToBackend(GetDevice());
    WGPUDevice innerDevice = device->GetInnerHandle();
    WGPUQueue queue = ToBackend(device->GetQueue())->GetInnerHandle();
    auto& wgpu = device->wgpu;

    // For each mip level, emit a WriteTexture command, for the entire level.
    // Then, copy the texture to a buffer, map it, and write the buffer data for that level.
    for (uint32_t mipLevel = 0; mipLevel < GetNumMipLevels(); ++mipLevel) {
        auto size =
            TexelExtent3D(GetMipLevelSingleSubresourcePhysicalSize(mipLevel, Aspect::Color));
        auto blockSize = blockInfo.ToBlock(size);
        uint32_t usedBytesPerRow = uint32_t(blockInfo.ToBytes(blockSize.width));

        schema::RootCommandWriteTextureCmd cmd{{
            .data = {{
                .destination = {{
                    .textureId = id,
                    .mipLevel = mipLevel,
                    .origin = {{.x = 0, .y = 0, .z = 0}},
                    .aspect = wgpu::TextureAspect::All,
                }},
                .layout = {{
                    .offset = 0,
                    .bytesPerRow = usedBytesPerRow,
                    .rowsPerImage = uint32_t(blockSize.height),
                }},
                .size = {{
                    .width = uint32_t(size.width),
                    .height = uint32_t(size.height),
                    .depthOrArrayLayers = uint32_t(size.depthOrArrayLayers),
                }},
                .dataSize = blockInfo.ToBytes(blockSize.width * blockSize.height *
                                              blockSize.depthOrArrayLayers),
            }},
        }};
        Serialize(captureContext, cmd);

        uint32_t alignedBytesPerRow = Align(usedBytesPerRow, 256);
        BlockCount maxBlockRowsPerRead{CaptureContext::kCopyBufferSize / alignedBytesPerRow};
        DAWN_ASSERT(maxBlockRowsPerRead > BlockCount{0});

        for (BlockCount z{0}; z < blockSize.depthOrArrayLayers; ++z) {
            for (BlockCount y{0}; y < blockSize.height; y += maxBlockRowsPerRead) {
                BlockCount blockRows = std::min(maxBlockRowsPerRead, blockSize.height - y);
                // Copy Data from Texture to Buffer. Then map and write buffer.
                WGPUTexelCopyTextureInfo srcTexture{
                    .texture = GetInnerHandle(),
                    .mipLevel = mipLevel,
                    .origin =
                        {
                            .x = 0,
                            .y = uint32_t(blockInfo.ToTexelHeight(y)),
                            .z = uint32_t(blockInfo.ToTexelHeight(z)),
                        },
                    .aspect = WGPUTextureAspect_All,
                };
                WGPUTexelCopyBufferInfo dstBuffer{
                    .layout =
                        {
                            .offset = 0,
                            .bytesPerRow = alignedBytesPerRow,
                            .rowsPerImage = uint32_t(blockRows),
                        },
                    .buffer = copyBuffer,
                };
                WGPUExtent3D copySize{
                    .width = uint32_t(blockInfo.ToTexelWidth(blockSize.width)),
                    .height = uint32_t(blockInfo.ToTexelHeight(blockRows)),
                    .depthOrArrayLayers = 1,
                };
                WGPUCommandEncoder encoder = wgpu.deviceCreateCommandEncoder(innerDevice, nullptr);
                wgpu.commandEncoderCopyTextureToBuffer(encoder, &srcTexture, &dstBuffer, &copySize);
                WGPUCommandBuffer commandBuffer = wgpu.commandEncoderFinish(encoder, nullptr);
                wgpu.queueSubmit(queue, 1, &commandBuffer);
                wgpu.commandBufferRelease(commandBuffer);
                wgpu.commandEncoderRelease(encoder);

                // Map the buffer to read back the content.
                WGPUBufferMapCallbackInfo innerCallbackInfo = {};
                innerCallbackInfo.mode = WGPUCallbackMode_WaitAnyOnly;
                innerCallbackInfo.callback = [](WGPUMapAsyncStatus status, WGPUStringView message,
                                                void* result_param, void* userdata_param) {
                    MapAsyncResult* result = reinterpret_cast<MapAsyncResult*>(result_param);
                    result->status = status;
                    result->message = ToString(message);
                };
                innerCallbackInfo.userdata1 = &mapAsyncResult;
                innerCallbackInfo.userdata2 = this;

                // Read this back synchronously.
                WGPUFutureWaitInfo waitInfo = {};
                uint64_t offset = 0;
                waitInfo.future =
                    wgpu.bufferMapAsync(copyBuffer, WGPUMapMode_Read, offset,
                                        CaptureContext::kCopyBufferSize, innerCallbackInfo);
                wgpu.instanceWaitAny(device->GetInnerInstance(), 1, &waitInfo, UINT64_MAX);

                DAWN_ASSERT(mapAsyncResult.status == WGPUMapAsyncStatus_Success);

                if (mapAsyncResult.status != WGPUMapAsyncStatus_Success) {
                    return DAWN_INTERNAL_ERROR(mapAsyncResult.message);
                }

                // We only write out the beginning of each row, the rest is padding.
                for (BlockCount blockRow{0}; blockRow < blockRows; ++blockRow) {
                    const void* data = wgpu.bufferGetConstMappedRange(
                        copyBuffer, uint32_t(blockRow) * alignedBytesPerRow, usedBytesPerRow);
                    captureContext.WriteContentBytes(data, usedBytesPerRow);
                }
                wgpu.bufferUnmap(copyBuffer);
            }
        }
    }
    return {};
}

void TextureView::SetLabelImpl() {
    ToBackend(GetDevice())->CaptureSetLabel(this, GetLabel());
}

MaybeError TextureView::AddReferenced(CaptureContext& captureContext) {
    return captureContext.AddResource(ToBackend(GetTexture()));
}

MaybeError TextureView::CaptureCreationParameters(CaptureContext& captureContext) {
    schema::TextureView tex{{
        .textureId = captureContext.GetId(GetTexture()),
        .format = GetFormat().baseFormat,
        .dimension = GetDimension(),
        .baseMipLevel = GetBaseMipLevel(),
        .mipLevelCount = GetLevelCount(),
        .baseArrayLayer = GetBaseArrayLayer(),
        .arrayLayerCount = GetLayerCount(),
        .aspect = ToDawn(GetAspects()),
        .usage = GetUsage(),
    }};
    Serialize(captureContext, tex);
    return {};
}

}  // namespace dawn::native::webgpu