File indexing completed on 2024-04-21 14:44:32

 /*
     SPDX-FileCopyrightText: 2021 Valentin Boettcher <hiro at protagon.space; @hiro98:tchncs.de>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #ifndef CATALOGCSVIMPORT_H
 #define CATALOGCSVIMPORT_H
 
 #include <QDialog>
 #include <QString>
 #include <QComboBox>
 #include <QFile>
 #include "polyfills/qstring_hash.h"
 #include <unordered_map>
 #include <rapidcsv.h>
 #include "catalogobject.h"
 #include "skyobject.h"
 #include "catalogobjectlistmodel.h"
 
 namespace Ui
 {
 class CatalogCSVImport;
 }
 
 /**
  * Custom Conversion Logic
  *
  * This requires some template magic to give the parser information
  * wether to use degrees or hours.
  */
 enum coord_unit
 {
     deg   = 0,
     hours = 1,
 };
 
 template <coord_unit unit_p>
 struct typed_dms
 {
     dms data;
 };
 
 namespace rapidcsv
 {
 template <>
 inline void
 Converter<typed_dms<coord_unit::deg>>::ToVal(const std::string &pStr,
                                              typed_dms<coord_unit::deg> &pVal) const
 {
     if (!pVal.data.setFromString(pStr.c_str(), true))
         throw std::exception();
 }
 
 template <>
 inline void
 Converter<typed_dms<coord_unit::hours>>::ToVal(const std::string &pStr,
                                                typed_dms<coord_unit::hours> &pVal) const
 {
     if (!pVal.data.setFromString(pStr.c_str(), false))
         throw std::exception();
 }
 
 template <>
 inline void Converter<QString>::ToVal(const std::string &pStr, QString &pVal) const
 {
     pVal = QString(pStr.c_str());
 }
 } // namespace rapidcsv
 
 class CatalogCSVImport : public QDialog
 {
     Q_OBJECT
 
   public:
     explicit CatalogCSVImport(QWidget *parent = nullptr);
     ~CatalogCSVImport();
 
     /**
      * Maps a string to a `SkyObject::TYPE`.
      */
     using type_map = std::unordered_map<std::string, SkyObject::TYPE>;
 
     /**
      * Maps a field in the Catalog object to a column in the CSV.
      *
      * The first element of the tuple can take on the following values:
      *     - -2 :: Default initialize this value.
      *     - -1 :: Take the value in the second part of the string for every row.
      *     - everything else :: Read from the column indicated by the integer value.
      */
     using column_pair = std::pair<int, QString>;
     using column_map  = std::unordered_map<QString, column_pair>;
 
     inline const std::vector<CatalogObject> &get_objects() const { return m_objects; };
   private slots:
     /** Selects a CSV file and opens it. Calls `init_mapping_selectors`. */
     void select_file();
 
     /** Reads the header of the CSV and initializes the mapping selectors. */
     void init_mapping_selectors();
 
     /** Add a row to the type table. */
     void type_table_add_map();
 
     /** Remove the selected row from the type table. */
     void type_table_remove_map();
 
     /** Read all the objects from the csv */
     inline void read_objects() { read_n_objects(); };
 
   private:
     void init_column_mapping();
     void init_type_table();
     type_map get_type_mapping();
     column_map get_column_mapping();
     void read_n_objects(size_t n = std::numeric_limits<int>::max());
 
     // Parsing
     SkyObject::TYPE parse_type(const std::string &type, const type_map &type_map);
 
     template <typename T>
     T cell_or_default(const column_pair &config, const size_t row, const T &default_val)
     {
         if (config.first < 0)
             return default_val;
 
         return m_doc.GetCell<T>(config.first, row);
     };
 
     template <typename T>
     T get_default(const column_pair &config, const T &default_val)
     {
         if (config.first != -1)
             return default_val;
 
         rapidcsv::Converter<T> converter(rapidcsv::ConverterParams{});
 
         T res{};
         converter.ToVal(config.second.toStdString(), res);
 
         return res;
     }
 
     Ui::CatalogCSVImport *ui;
 
     /** Disables the mapping selection and resets everything. */
     void reset_mapping();
 
     /** Maps the fields to a selector widget. */
     std::map<QString, QComboBox *> m_selectors{};
 
     /** Rapidcsv Document */
     rapidcsv::Document m_doc{};
 
     /** The Parsed Objects */
     std::vector<CatalogObject> m_objects;
 
     /** The model to preview the import */
     CatalogObjectListModel m_preview_model;
 
     static const char default_separator = ',';
     static const char default_comment     = '#';
     static const int default_preview_size = 10;
 };
 
 #endif // CATALOGCSVIMPORT_H