/****************************************************************************
 Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.

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 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights to
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 of the Software, and to permit persons to whom the Software is furnished to do so,
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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****************************************************************************/

#include "PassNode.h"
#include <algorithm>
#include "FrameGraph.h"
#include "ResourceNode.h"

namespace cc {
namespace framegraph {

PassNode::PassNode(const PassInsertPoint inserPoint, const StringHandle name, const ID &id, Executable *pass)
: _pass(pass),
  _name(name),
  _id(id),
  _insertPoint(inserPoint) {
    CC_ASSERT(_name.isValid());
}

Handle PassNode::read(FrameGraph & /*graph*/, const Handle &input) {
    const auto it = std::find_if(_reads.begin(), _reads.end(), [input](const Handle handle) {
        return input == handle;
    });

    if (it == _reads.end()) {
        _reads.push_back(input);
    }

    return input;
}

Handle PassNode::write(FrameGraph &graph, const Handle &output) {
    CC_ASSERT(std::find_if(_writes.begin(), _writes.end(), [output](const Handle handle) {
                  return output == handle;
              }) == _writes.end());

    const ResourceNode &nodeOldVersion = graph.getResourceNode(output);
    nodeOldVersion.virtualResource->newVersion();
    _sideEffect = _sideEffect || nodeOldVersion.virtualResource->isImported();
    const Handle handle = graph.createResourceNode(nodeOldVersion.virtualResource);
    ResourceNode &nodeNewVersion = graph.getResourceNode(handle);
    nodeNewVersion.writer = this;
    _writes.push_back(handle);
    return handle;
}

void PassNode::createRenderTargetAttachment(RenderTargetAttachment &&attachment) {
    if (attachment.desc.usage == RenderTargetAttachment::Usage::COLOR) {
        if (attachment.desc.slot == 0xff) {
            for (uint8_t i = 0; i < RenderTargetAttachment::DEPTH_STENCIL_SLOT_START; ++i) {
                if ((_usedRenderTargetSlotMask & (1 << i)) == 0) {
                    attachment.desc.slot = i;
                    break;
                }
            }
        } else {
            CC_ASSERT(attachment.desc.slot < RenderTargetAttachment::DEPTH_STENCIL_SLOT_START);
        }
    } else {
        attachment.desc.slot = RenderTargetAttachment::DEPTH_STENCIL_SLOT_START + static_cast<uint8_t>(attachment.desc.usage) - 1;

        if (attachment.desc.usage == RenderTargetAttachment::Usage::DEPTH_STENCIL) {
            CC_ASSERT((_usedRenderTargetSlotMask & (1 << (RenderTargetAttachment::DEPTH_STENCIL_SLOT_START + static_cast<uint8_t>(RenderTargetAttachment::Usage::DEPTH) - 1))) == 0);
            CC_ASSERT((_usedRenderTargetSlotMask & (1 << (RenderTargetAttachment::DEPTH_STENCIL_SLOT_START + static_cast<uint8_t>(RenderTargetAttachment::Usage::STENCIL) - 1))) == 0);
        } else {
            CC_ASSERT((_usedRenderTargetSlotMask & (1 << (RenderTargetAttachment::DEPTH_STENCIL_SLOT_START + static_cast<uint8_t>(attachment.desc.usage) - 1))) == 0);
        }
    }

    CC_ASSERT((_usedRenderTargetSlotMask & (1 << attachment.desc.slot)) == 0);
    _usedRenderTargetSlotMask |= (1 << attachment.desc.slot);

    _attachments.emplace_back(attachment);
    _hasClearedAttachment = _hasClearedAttachment || (attachment.desc.loadOp == gfx::LoadOp::CLEAR);
}

bool PassNode::canMerge(const FrameGraph &graph, const PassNode &passNode) const {
    const size_t attachmentCount = _attachments.size();

    if (passNode._hasClearedAttachment || attachmentCount != passNode._attachments.size()) {
        return false;
    }

    for (size_t i = 0; i < attachmentCount; ++i) {
        const RenderTargetAttachment &attachmentInPassNodeA = _attachments[i];
        const RenderTargetAttachment &attachmentInPassNodeB = passNode._attachments[i];

        if (attachmentInPassNodeA.desc.usage != attachmentInPassNodeB.desc.usage ||
            attachmentInPassNodeA.desc.slot != attachmentInPassNodeB.desc.slot ||
            attachmentInPassNodeA.desc.writeMask != attachmentInPassNodeB.desc.writeMask ||
            attachmentInPassNodeA.level != attachmentInPassNodeB.level ||
            attachmentInPassNodeA.layer != attachmentInPassNodeB.layer ||
            attachmentInPassNodeA.index != attachmentInPassNodeB.index ||
            graph.getResourceNode(attachmentInPassNodeA.textureHandle).virtualResource != graph.getResourceNode(attachmentInPassNodeB.textureHandle).virtualResource) {
            return false;
        }
    }

    return true;
}

RenderTargetAttachment *PassNode::getRenderTargetAttachment(const Handle &handle) {
    const auto it = std::find_if(_attachments.begin(), _attachments.end(), [&handle](const RenderTargetAttachment &attachment) {
        return attachment.textureHandle == handle;
    });

    return it == _attachments.end() ? nullptr : &(*it);
}

RenderTargetAttachment *PassNode::getRenderTargetAttachment(const FrameGraph &graph, const VirtualResource *const resource) {
    const auto it = std::find_if(_attachments.begin(), _attachments.end(), [&](const RenderTargetAttachment &attachment) {
        return graph.getResourceNode(attachment.textureHandle).virtualResource == resource;
    });

    return it == _attachments.end() ? nullptr : &(*it);
}

void PassNode::requestTransientResources() {
    PassNode *it = this;

    do {
        std::for_each(it->_resourceRequestArray.begin(), it->_resourceRequestArray.end(), [](VirtualResource *const resource) {
            if (!resource->isImported()) {
                resource->request();
            }
        });

        it = it->_next;
    } while (it);
}

void PassNode::releaseTransientResources() {
    PassNode *it = this;

    do {
        // resources should be release in the reverse order to stabilize usages between frames
        std::for_each(it->_resourceReleaseArray.rbegin(), it->_resourceReleaseArray.rend(), [](VirtualResource *const resource) {
            if (!resource->isImported()) {
                resource->release();
            }
        });

        it = it->_next;
    } while (it);
}

void PassNode::setDevicePassId(ID const id) {
    PassNode *it = this;

    do {
        it->_devicePassId = id;

        it = it->_next;
    } while (it);
}

Handle PassNode::getWriteResourceNodeHandle(const FrameGraph &graph, const VirtualResource *const resource) const {
    const auto it = std::find_if(_writes.begin(), _writes.end(), [&](const Handle handle) {
        return graph.getResourceNode(handle).virtualResource == resource;
    });

    return it == _writes.end() ? Handle{} : *it;
}

void PassNode::setBarrier(const PassBarrierPair &barrier) {
    _barriers = barrier;
}

} // namespace framegraph
} // namespace cc