/** Defines the collada loader class */

/*

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*/

#ifndef AI_COLLADALOADER_H_INC

#define AI_COLLADALOADER_H_INC

#include "ColladaParser.h"

#include <assimp/BaseImporter.h>

struct aiNode;

struct aiCamera;

struct aiLight;

struct aiTexture;

struct aiAnimation;

namespace Assimp {

struct ColladaMeshIndex {

    std::string mMeshID;

    size_t mSubMesh;

    std::string mMaterial;

    ColladaMeshIndex(const std::string &pMeshID, size_t pSubMesh, const std::string &pMaterial) :

            mMeshID(pMeshID), mSubMesh(pSubMesh), mMaterial(pMaterial) {

        ai_assert(!pMeshID.empty());

    }

    bool operator<(const ColladaMeshIndex &p) const {

        if (mMeshID == p.mMeshID) {

            if (mSubMesh == p.mSubMesh)

                return mMaterial < p.mMaterial;

            else

                return mSubMesh < p.mSubMesh;

        } else {

            return mMeshID < p.mMeshID;

        }

    }

};

/**

 * @brief Loader class to read Collada scenes.

 *

 * Collada is over-engineered to death, with every new iteration bringing  more useless stuff,

 * so I limited the data to what I think is useful for games.

*/

class ColladaLoader final : public BaseImporter {

public:

    /// The class constructor.

    ColladaLoader();

    /// The class destructor.

    ~ColladaLoader() override = default;

    /// Returns whether the class can handle the format of the given file.

    /// @see BaseImporter::CanRead() for more details.

    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const override;

protected:

    /// See #BaseImporter::GetInfo for the details

    const aiImporterDesc *GetInfo() const override;

    /// See #BaseImporter::SetupProperties for the details

    void SetupProperties(const Importer *pImp) override;

    /// See #BaseImporter::InternReadFile for the details

    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;

    /// Recursively constructs a scene node for the given parser node and returns it.

    aiNode *BuildHierarchy(const ColladaParser &pParser, const Collada::Node *pNode);

    /// Resolve node instances

    void ResolveNodeInstances(const ColladaParser &pParser, const Collada::Node *pNode,

            std::vector<const Collada::Node *> &resolved) const;

    /// Builds meshes for the given node and references them

    void BuildMeshesForNode(const ColladaParser &pParser, const Collada::Node *pNode,

            aiNode *pTarget);

    /// Lookup for meshes by their name

    aiMesh *findMesh(const std::string &meshid);

    /// Creates a mesh for the given ColladaMesh face subset and returns the newly created mesh

    aiMesh *CreateMesh(const ColladaParser &pParser, const Collada::Mesh *pSrcMesh, const Collada::SubMesh &pSubMesh,

            const Collada::Controller *pSrcController, size_t pStartVertex, size_t pStartFace);

    /// Builds cameras for the given node and references them

    void BuildCamerasForNode(const ColladaParser &pParser, const Collada::Node *pNode,

            aiNode *pTarget);

    /// Builds lights for the given node and references them

    void BuildLightsForNode(const ColladaParser &pParser, const Collada::Node *pNode,

            aiNode *pTarget);

    /// Stores all meshes in the given scene

    void StoreSceneMeshes(aiScene *pScene);

    /// Stores all materials in the given scene

    void StoreSceneMaterials(aiScene *pScene);

    /// Stores all lights in the given scene

    void StoreSceneLights(aiScene *pScene);

    /// Stores all cameras in the given scene

    void StoreSceneCameras(aiScene *pScene);

    /// Stores all textures in the given scene

    void StoreSceneTextures(aiScene *pScene);

    /// Stores all animations

    /// @param pScene   Target scene to store the anims

    /// @param parser   The collada parser

    void StoreAnimations(aiScene *pScene, const ColladaParser &parser);

    /** Stores all animations for the given source anim and its nested child animations

     * @param pScene target scene to store the anims

     * @param pSrcAnim the source animation to process

     * @param pPrefix Prefix to the name in case of nested animations

     */

    void StoreAnimations(aiScene *pScene, const ColladaParser &pParser, const Collada::Animation *pSrcAnim, const std::string &pPrefix);

    /** Constructs the animation for the given source anim */

    void CreateAnimation(aiScene *pScene, const ColladaParser &pParser, const Collada::Animation *pSrcAnim, const std::string &pName);

    /** Constructs materials from the collada material definitions */

    void BuildMaterials(ColladaParser &pParser, aiScene *pScene);

    /** Fill materials from the collada material definitions */

    void FillMaterials(const ColladaParser &pParser, aiScene *pScene);

    /** Add a texture and all of its sampling properties to a material*/

    void AddTexture(aiMaterial &mat, const ColladaParser &pParser,

            const Collada::Effect &effect,

            const Collada::Sampler &sampler,

            aiTextureType type, unsigned int idx = 0);

    /** Resolves the texture name for the given effect texture entry */

    aiString FindFilenameForEffectTexture(const ColladaParser &pParser,

            const Collada::Effect &pEffect, const std::string &pName);

    /** Reads a string value from an accessor and its data array.

     * @param pAccessor The accessor to use for reading

     * @param pData The data array to read from

     * @param pIndex The index of the element to retrieve

     * @return the specified value

     */

    [[nodiscard]] const std::string &ReadString(const Collada::Accessor &pAccessor, const Collada::Data &pData, size_t pIndex) const;

    /** Recursively collects all nodes into the given array */

    void CollectNodes(const aiNode *pNode, std::vector<const aiNode *> &poNodes) const;

    /** Finds a node in the collada scene by the given name */

    const Collada::Node *FindNode(const Collada::Node *pNode, const std::string &pName) const;

    /** Finds a node in the collada scene by the given SID */

    const Collada::Node *FindNodeBySID(const Collada::Node *pNode, const std::string &pSID) const;

    /** Finds a proper name for a node derived from the collada-node's properties */

    std::string FindNameForNode(const Collada::Node *pNode);

private:

    /** Filename, for a verbose error message */

    std::string mFileName;

    /** Which mesh-material compound was stored under which mesh ID */

    std::map<ColladaMeshIndex, size_t> mMeshIndexByID;

    /** Which material was stored under which index in the scene */

    std::map<std::string, size_t> mMaterialIndexByName;

    /** Accumulated meshes for the target scene */

    std::vector<aiMesh *> mMeshes;

    /** Accumulated morph target meshes */

    std::vector<aiMesh *> mTargetMeshes;

    /** Temporary material list */

    std::vector<std::pair<Collada::Effect *, aiMaterial *>> newMats;

    /** Temporary camera list */

    std::vector<aiCamera *> mCameras;

    /** Temporary light list */

    std::vector<aiLight *> mLights;

    /** Temporary texture list */

    std::vector<aiTexture *> mTextures;

    /** Accumulated animations for the target scene */

    std::vector<aiAnimation *> mAnims;

    bool noSkeletonMesh;

    bool removeEmptyBones;

    bool ignoreUpDirection;

    bool ignoreUnitSize;

    bool useColladaName;

    /** Used by FindNameForNode() to generate unique node names */

    unsigned int mNodeNameCounter;

};

} // end of namespace Assimp

#endif // AI_COLLADALOADER_H_INC