/*++

Copyright (C) 2023 3MF Consortium

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are permitted provided that the following conditions are met:

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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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--*/

#include "Model/Classes/NMR_ModelImplicitFunction.h"

#include "Common/NMR_Exception.h"
#include "lib3mf_interfaceexception.hpp"
#include "lib3mf_types.hpp"
#include "Model/Classes/NMR_ImplicitNodeTypes.h"
#include "Model/Classes/NMR_ModelImplicitFunction.h"
#include "Model/Classes/NMR_ModelImplicitPort.h"
#include "Common/Graph/GraphAlgorithms.h"
#include "Common/Graph/DirectedGraph.h"

#include <algorithm>
#include <queue>

namespace NMR
{
    const implicit::NodeTypes CModelImplicitFunction::m_nodeTypes;

    CModelImplicitNode *
    CModelImplicitFunction::findNode(const ImplicitIdentifier & sIdentifier) const
    {
        for (auto & node : *m_nodes)
        {
            if (node->getIdentifier() == sIdentifier)
            {
                return node.get();
            }
        }
        return nullptr;
    }

    CModelImplicitFunction::CModelImplicitFunction(const ModelResourceID sID,
                                                   CModel* pModel)
        : CModelFunction(sID, pModel)
    {
        m_nodes = std::make_shared<ImplicitNodes>();
    }

    std::string const & CModelImplicitFunction::getIdentifier() const
    {
        return m_identifier;
    }

    void CModelImplicitFunction::setIdentifier(std::string const & identifier)
    {
        m_identifier = identifier;
    }

    PModelImplicitNode CModelImplicitFunction::addNode(const Lib3MF::eImplicitNodeType eNodeType,
                                                       const Lib3MF::eImplicitNodeConfiguration eConfiguration,
                                                       const std::string & sIdentifier,
                                                       const std::string & sDisplayName,
                                                       const std::string & sTag)
    {
        auto node = std::make_shared<CModelImplicitNode>(eNodeType, sIdentifier, sDisplayName, sTag, this);

        m_nodeTypes.addExpectedPortsToNode(*node, eConfiguration);
        m_nodes->push_back(node);
        return node;
    }

    PModelImplicitNode CModelImplicitFunction::addNode(const Lib3MF::eImplicitNodeType eNodeType, const Lib3MF::eImplicitNodeConfiguration eConfiguration)
    {
        return addNode(eNodeType, eConfiguration, "", "", "");
    }

    PImplicitNodes NMR::CModelImplicitFunction::getNodes() const
    {
        return m_nodes;
    }

    void NMR::CModelImplicitFunction::addLink(
        const ImplicitIdentifier& sSourceNodeIdentifier,
        const ImplicitIdentifier& sTargetNodeIdentifier)

    {
        auto const sourceNodeName = extractNodeName(sSourceNodeIdentifier);

        PModelImplicitPort sourcePort;
        if(sourceNodeName == "inputs")
        {
            auto const sourcePortName = extractPortName(sSourceNodeIdentifier);
            sourcePort = findInput(sourcePortName);
        }
        else
        {
            auto const sourceNode = findNode(sourceNodeName);
            if(sourceNode == nullptr)
            {
                throw ELib3MFInterfaceException(
                    LIB3MF_ERROR_INVALIDPARAM,
                    "Source node " + sourceNodeName + " does not exist.");
            }
            auto const sourcePortName = extractPortName(sSourceNodeIdentifier);
            if(sourcePortName.empty())
            {
                throw ELib3MFInterfaceException(
                    LIB3MF_ERROR_INVALIDPARAM,
                    "Source port " + sourcePortName + " of node " +
                        sourceNodeName + " does not exist.");
            }
            sourcePort = sourceNode->findOutput(sourcePortName);
        }
        if(!sourcePort)
        {
            throw CNMRException(
                NMR_ERROR_IMPLICIT_FUNCTION_INVALID_SOURCE_PORT);
        }

        auto const targetNodeName = extractNodeName(sTargetNodeIdentifier);
        auto const targetPortName = extractPortName(sTargetNodeIdentifier);
        NMR::PModelImplicitPort targetPort;
        if(targetNodeName == "outputs")
        {
            targetPort = findOutput(targetPortName);
        }
        else
        {
            auto const targetNode = findNode(targetNodeName);
            if(targetNode == nullptr)
            {
                throw ELib3MFInterfaceException(
                    LIB3MF_ERROR_INVALIDPARAM,
                    "Target node " + targetNodeName + " does not exist.");
            }

            if(targetPortName.empty())
            {
                throw ELib3MFInterfaceException(
                    LIB3MF_ERROR_INVALIDPARAM,
                    "Target port " + targetPortName + " of node " +
                        targetNodeName + " does not exist.");
            }

            targetPort = targetNode->findInput(targetPortName);
        }

        if(!targetPort)
        {
            throw ELib3MFInterfaceException(
                LIB3MF_ERROR_INVALIDPARAM,
                "Target port " + targetPortName + " of node " +
                    targetNodeName + " does not exist.");
        }

        if(sourcePort->getType() != targetPort->getType())
        {
            std::string sourceNodeIdentifier = "function inputs";
            std::string targetNodeIdentifier = "function outputs";

            if(sourcePort->getParent())
            {
                sourceNodeIdentifier = sourcePort->getParent()->getIdentifier();
            }

            if(targetPort->getParent())
            {
                targetNodeIdentifier = targetPort->getParent()->getIdentifier();
            }

            throw ELib3MFInterfaceException(
                LIB3MF_ERROR_INCOMPATIBLEPORTTYPES,
                "Output " + sourcePort->getIdentifier() + " of node " +
                    sourceNodeIdentifier + " has type " +
                    std::to_string(static_cast<int>(sourcePort->getType())) +
                    " while target input " + targetPort->getIdentifier() +
                    " of node " + targetNodeIdentifier + " has type " +
                    std::to_string(static_cast<int>(targetPort->getType())) +
                    ".");
            
        }
        
        targetPort->setReferencedPort(sourcePort);
    }

    void CModelImplicitFunction::addLink(PModelImplicitPort pSourcePort,
                                         PModelImplicitPort pTargetPort)
    {
        if (!pSourcePort)
        {
            throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                            "Source port is nullptr.");
        }

        if (!pTargetPort)
        {
            throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                            "Target port is nullptr.");
        }
        
        if(pSourcePort->getType() != pTargetPort->getType())
        {
            std::string sourceNodeIdentifier = "function inputs";
            std::string targetNodeIdentifier = "function outputs";

            if(pSourcePort->getParent())
            {
                sourceNodeIdentifier = pSourcePort->getParent()->getIdentifier();
            }

            if(pTargetPort->getParent())
            {
                targetNodeIdentifier = pTargetPort->getParent()->getIdentifier();
            }

            throw ELib3MFInterfaceException(
                LIB3MF_ERROR_INCOMPATIBLEPORTTYPES,
                "Output " + pSourcePort->getIdentifier() + " of node " +
                    sourceNodeIdentifier + " has type " +
                    std::to_string(static_cast<int>(pSourcePort->getType())) +
                    " while target input " + pTargetPort->getIdentifier() +
                    " of node " + targetNodeIdentifier + " has type " +
                    std::to_string(static_cast<int>(pTargetPort->getType())) +
                    ".");
        }
        
        pTargetPort->setReferencedPort(pSourcePort);
    }

    implicit::NodeTypes const& CModelImplicitFunction::getNodeTypes() const
    {
        return m_nodeTypes;
    }

    void CModelImplicitFunction::removeNode(
        ImplicitIdentifier const& sIdentifier)
    {
        auto node = findNode(sIdentifier);
        if(node == nullptr)
        {
            throw CNMRException(NMR_ERROR_INVALIDPOINTER);
        }
        m_nodes->erase(std::remove_if(m_nodes->begin(), m_nodes->end(),
                                      [node](PModelImplicitNode const& n)
                                      { return n.get() == node; }),
                       m_nodes->end());
    }

    void CModelImplicitFunction::clear() 
    {
        CModelFunction::clear();
        m_nodes->clear();
    }

    void CModelImplicitFunction::replaceResourceID(const ModelResourceID sOldID,
                                                  const ModelResourceID sNewID)
    {
        for (auto & node : *m_nodes)
        {
            if (node->getModelResourceID() == sOldID)
            {
                node->setModelResourceID(sNewID);
            }
        }
    }


    std::string extractNodeName(const ImplicitIdentifier& sIdentifier)
    {
        auto pos = sIdentifier.find_last_of(".");
        if (pos == std::string::npos)
        {
            return "";
        }
        return sIdentifier.substr(0, pos);
    }

    std::string extractPortName(const ImplicitIdentifier & sIdentifier)
    {
        auto pos = sIdentifier.find_last_of(".");
        if (pos == std::string::npos)
        {
            return sIdentifier;
        }
        return sIdentifier.substr(pos + 1);
    }

    ImplicitIdentifier makeReferenceIdentifier(const ImplicitIdentifier & sNodeIdentifier,
                                               const ImplicitIdentifier & sPortIdentifier)
    {
        if (sNodeIdentifier.empty())
        {
            return "inputs." + sPortIdentifier;
        }
        return sNodeIdentifier + "." + sPortIdentifier;
    }

    NMR::common::graph::DirectedGraph directedGraphFromNodes(const PImplicitNodes & nodes)
    {
        if (!nodes)
        {
            throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                            "Nodes must not be nullptr.");
        }

        using namespace NMR::common;
        graph::DirectedGraph graph(nodes->size()+1);

        std::unordered_map<ImplicitIdentifier, graph::Identifier> identifierToIndex;
        graph::Identifier InputsIndex = 0;

        graph::Identifier index = 1;
        for (auto const& node : *nodes)
        {
            if (!node)
            {
                throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                "Node must not be nullptr.");
            }

            auto const& identifier = node->getIdentifier();
            identifierToIndex[identifier] = index;
            ++index;
        }

        for (auto const& node : *nodes)
        {
            auto const& inputs = node->getInputs();

            if (!inputs)
            {
                throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                "Inputs must not be nullptr.");
            }

            for (auto const& input : *inputs)
            {
                auto const& sourcePort = input->getReferencedPort();
                if (sourcePort)
                {
                    auto const& sourceNode = sourcePort->getParent();
                    if (sourceNode)
                    {
                        auto const& sourceNodeIdentifier = sourceNode->getIdentifier();
                        graph::Identifier const sourceIndex = identifierToIndex[sourceNodeIdentifier];
                        graph::Identifier const targetIndex = identifierToIndex[node->getIdentifier()];
                        if (sourceIndex >= graph.getSize())
                        {
                            throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                            "Source index " + std::to_string(sourceIndex) + " is out of range.");
                        }

                        if (targetIndex >= graph.getSize())
                        {
                            throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                            "Target index " + std::to_string(targetIndex) + " is out of range.");
                        }
                        graph.addDependency(sourceIndex, targetIndex);
                    }
                    else
                    {
                        graph.addDependency(InputsIndex, identifierToIndex[node->getIdentifier()]);
                    }
                }

            }
        }
        return graph;
    }

    void CModelImplicitFunction::sortNodesTopologically()
    {
        using namespace NMR::common;
        auto graph = directedGraphFromNodes(m_nodes);
        auto const sortedIndices = NMR::common::graph::topologicalSort(graph);
        if (sortedIndices.empty())
        {
            throw ELib3MFInterfaceException(LIB3MF_ERROR_GRAPHISCYCLIC);
        }
       
        PImplicitNodes sortedNodes = std::make_shared<ImplicitNodes>();
        sortedNodes->reserve(sortedIndices.size());

        for (auto const & index : sortedIndices)
        {
            if (index == 0)
            {
                continue;
            }
            
            auto nodeIndex = index - 1;
            
            if (nodeIndex >= m_nodes->size())
            {
                throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                "Invalid node index " + std::to_string(nodeIndex) + ". Node index must be between 0 and " + std::to_string(m_nodes->size()) + ".");
            }

            sortedNodes->push_back(m_nodes->at(nodeIndex));
        }
        std::swap(m_nodes, sortedNodes);
    }

    PModelImplicitPort
    NMR::CModelImplicitFunction::findPort(const ImplicitIdentifier & sIdentifier) const
    {
        auto const nodeName = extractNodeName(sIdentifier);
        auto const portName = extractPortName(sIdentifier);
        if (nodeName == "inputs")
        {
            return findInput(portName);
        }
        auto const node = findNode(nodeName);
        if (node == nullptr)
        {
            return {};
        }
        if (portName.empty())
        {
            return {};
        }
        return node->findOutput(portName);
    }

    ResourceDependencies CModelImplicitFunction::getDependencies()
    {  
        ResourceDependencies dependencies;
        for (auto const& node : *m_nodes)
        {
            if (!node)
            {
                throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                "Node must not be nullptr.");
            }
            if (node->getNodeType() == Lib3MF::eImplicitNodeType::ConstResourceID)
            {
                auto * model = getModel();
                if (!model)
                {
                    throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                    "Model must not be nullptr.");
                }

                auto referendedResource =  model->findResource(model->currentPath(), node->getModelResourceID());
                if (!referendedResource)
                {
                    throw ELib3MFInterfaceException(LIB3MF_ERROR_INVALIDPARAM,
                                                    "Referenced resource must not be nullptr.");
                }   
                dependencies.push_back(referendedResource->getPackageResourceID());
            }
        }
        return dependencies;
    }
}