/**
 * @file hdf5Groups.hpp
 * @brief HDF5 group management class and utilities
 * @details This header file provides a class for managing HDF5 groups and related
 * operations. The implementation includes:
 * 
 * Key features:
 * - Group creation and management
 * - Hierarchical group structure support
 * - Group existence checking
 * - Error handling
 * - Resource management
 */

#ifndef BIGDATASTATMETH_HDF5_GROUPS_HPP
#define BIGDATASTATMETH_HDF5_GROUPS_HPP


#include <RcppEigen.h>
#include "H5Cpp.h"

namespace BigDataStatMeth {

    /**
     * @class hdf5Group
     * @brief Class for managing HDF5 groups
     * @details Provides functionality for creating and managing HDF5 groups.
     * Inherits from hdf5File to handle file operations.
     */
    class hdf5Group : public hdf5File
    {
        
    public:
        
        /**
         * @brief Constructor with filename and group name
         * @param filename Name of HDF5 file
         * @param group Group name/path
         */
        hdf5Group(std::string filename, std::string group) :
        hdf5File(filename, false)
        {
            
            try  {
                
                openFile("rw");
                groupname = group;
                
            } catch( H5::FileIException& error ) { // catch failure caused by the H5File operations
                throw std::runtime_error("hdf5Group (File IException)");
            } catch( H5::DataSetIException& error ) { // catch failure caused by the DataSet operations
                throw std::runtime_error("hdf5Group (DataSet IException)");
            } catch(std::exception &ex) {
                throw std::runtime_error(std::string("hdf5Group: ") + ex.what());
            } 
            
        }
        
        /**
         * @brief Constructor with file pointer and group name
         * @param file HDF5 file pointer
         * @param group Group name/path
         */
        hdf5Group(H5::H5File* file, std::string group) : 
        hdf5File(file)
        {
            // Rcpp::Rcout<<"\nPassa per 2";
            
            try  {
                
                if (pfile == nullptr) openFile("rw");  //..2025/08/13..// 
                groupname = group;          //..2025/08/13..// 
                
            } catch( H5::FileIException& error ) { // catch failure caused by the H5File operations
                throw std::runtime_error("hdf5Group (File IException)");
            } catch( H5::DataSetIException& error ) { // catch failure caused by the DataSet operations
                throw std::runtime_error("hdf5Group (DataSet IException)");
            } catch(std::exception &ex) {
                throw std::runtime_error(std::string("hdf5Group: ") + ex.what());
            } 
            
            //..2025/08/13..// if( pfile != nullptr ){
            //..2025/08/13..//     openFile("rw");
            //..2025/08/13..//     groupname = group;
            //..2025/08/13..// } else {
            //..2025/08/13..//     Rf_error("Please create or close the file before proceeding");
            //..2025/08/13..// }
        }
        
        /**
         * @brief Constructor with file object and group name
         * @details Creates a new group, with option to force creation by removing existing group
         * 
         * @param objFile HDF5 file object
         * @param group Group name/path
         * @param forceGroup Whether to force group creation by removing existing group
         */
        hdf5Group(BigDataStatMeth::hdf5File* objFile, std::string group, bool forceGroup) : 
        hdf5File(objFile->getPath() , objFile->getFilename(), objFile->getFileptr(), false)
        {
            Rcpp::Rcout<<"\nPassa per 3";
            if( pfile != nullptr ){
                openFile("rw");
            } else {
                throw std::runtime_error("Please create or close the file before proceeding.");
            }
            
            if( exists_HDF5_element(pfile, group) ) {
                if( forceGroup == true) {
                    remove_elements(pfile, getGroupName(), {}); 
                } else {
                    throw std::runtime_error("Data already exists in the file. Please set overwrite = true to proceed.");
                }
                
            }
            create_HDF5_groups(group);    
            
            groupname = group;
            
            
        }
        
        
        /**
         * @brief Constructor with file object and group name
         * @details Creates a new group if it doesn't exist
         * 
         * @param objFile HDF5 file object
         * @param group Group name/path
         */
        //.. 20260426 ..// hdf5Group(BigDataStatMeth::hdf5File* objFile, std::string group) : 
        //.. 20260426 ..// hdf5File(objFile->getPath() , objFile->getFilename(), objFile->getFileptr(), false)
        //.. 20260426 ..// {
        //.. 20260426 ..//     if( pfile != nullptr ){
        //.. 20260426 ..//         openFile("rw");
        //.. 20260426 ..//     } else {
        //.. 20260426 ..//         throw std::runtime_error("Please create file before proceed");
        //.. 20260426 ..//     }
        //.. 20260426 ..//     
        //.. 20260426 ..//     if( !exists_HDF5_element(pfile, group) ) {
        //.. 20260426 ..//         create_HDF5_groups(group);    
        //.. 20260426 ..//     }
        //.. 20260426 ..//     
        //.. 20260426 ..//     groupname = group;
        //.. 20260426 ..// }
        
        hdf5Group(BigDataStatMeth::hdf5File* objFile, std::string group) : 
        hdf5File(objFile->getPath(), objFile->getFilename(), objFile->getFileptr(), false)
        {
            // pfile is already set from objFile — do NOT call openFile()
            // bOwnsFile = false is already set by the hdf5File constructor above
            if( pfile == nullptr ){
                throw std::runtime_error("file pointer is null");
            }
            if( !exists_HDF5_element(pfile, group) ) {
                create_HDF5_groups(group);    
            }
            groupname = group;
        }
        
        
        /**
         * @brief Create multiple nested groups
         * @details Creates a hierarchy of groups based on path separated by "/"
         * 
         * @param mGroup Group path with groups separated by "/"
         */
        // Create multiple group in hdf5 data file, groups must be separated by "/"
        void create_HDF5_groups( H5std_string mGroup)
        {
            try
            {
                H5::Exception::dontPrint();
                
                char * pch;
                std::string strgroup = mGroup;
                char*  cpgroup = &strgroup[0];
                std::string results = "";
                
                pch = strtok(cpgroup, "/"); 
                
                while (pch != NULL)  
                {  
                    if( results.compare("") == 0 ) {
                        results = pch;
                    } else {
                        results = results + "/" + pch;
                    }
                    
                    if(!pathExists( pfile->getId(), results )) {
                        pfile->createGroup(results);
                    }
                    pch = strtok (NULL, "/");  
                }  
                
            } catch(H5::FileIException& error) { // catch failure caused by the H5File operations
                // pfile->close();
                throw std::runtime_error("create_HDF5_groups_ptr (File IException)");
            } catch(H5::GroupIException& error) { // catch failure caused by the Group operations
                // pfile->close();
                throw std::runtime_error("create_HDF5_groups_ptr (Group IException)");
            } 
            
            groupname = mGroup;
            return void();
        }
        
        
        std::string getGroupName() { return(groupname); }  // Return group name
        
        
        // Destructor
        ~hdf5Group(){
        }
        
    protected:
        // Variables declaration
        std::string groupname;
        
    private:
        
        // Variables declaration
        // Function declarations
        
        
    };
}

#endif // BIGDATASTATMETH_HDF5_GROUPS_HPP
