/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004-2015 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 2008 Wayne Stambaugh <stambaughw@gmail.com>
 * Copyright (C) 2022 CERN
 * Copyright (C) 2004-2023 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef CLASS_LIBENTRY_H
#define CLASS_LIBENTRY_H

#include <general.h>
#include <lib_tree_item.h>
#include <lib_field.h>
#include <vector>
#include <core/multivector.h>

class LINE_READER;
class OUTPUTFORMATTER;
class REPORTER;
class SYMBOL_LIB;
class LIB_SYMBOL;
class LIB_FIELD;
class TEST_LIB_SYMBOL_FIXTURE;


typedef std::shared_ptr<LIB_SYMBOL>       LIB_SYMBOL_SPTR;      ///< shared pointer to LIB_SYMBOL
typedef std::weak_ptr<LIB_SYMBOL>         LIB_SYMBOL_REF;       ///< weak pointer to LIB_SYMBOL
typedef MULTIVECTOR<LIB_ITEM, LIB_SHAPE_T, LIB_FIELD_T> LIB_ITEMS_CONTAINER;
typedef LIB_ITEMS_CONTAINER::ITEM_PTR_VECTOR LIB_ITEMS;


/* values for member .m_options */
enum LIBRENTRYOPTIONS
{
    ENTRY_NORMAL,   // Libentry is a standard symbol (real or alias)
    ENTRY_POWER     // Libentry is a power symbol
};


extern bool operator<( const LIB_SYMBOL& aItem1, const LIB_SYMBOL& aItem2 );


struct LIB_SYMBOL_OPTIONS
{
    TRANSFORM transform;            // Coordinate adjustment settings
    bool force_draw_pin_text;       // Whether or not to force the drawing of pin names and numbers
    bool draw_visible_fields;       // Whether to draw "visible" fields
    bool draw_hidden_fields;        // Whether to draw "hidden" fields
    bool show_elec_type;            // Whether to show the pin electrical type
    bool show_connect_point;        // Whether to show the pin connect point marker (small circle)
                                    // useful in dialog pin properties

    LIB_SYMBOL_OPTIONS()
    {
        transform = DefaultTransform;
        force_draw_pin_text = false;
        draw_visible_fields = true;
        draw_hidden_fields = true;
        show_elec_type = false;
        show_connect_point = false;
    }
};


struct LIB_SYMBOL_UNIT
{
    int m_unit;                       ///< The unit number.
    int m_bodyStyle;                  ///< The alternate body style of the unit.
    std::vector<LIB_ITEM*> m_items;   ///< The items unique to this unit and alternate body style.
};


/**
 * Define a library symbol object.
 *
 * A library symbol object is typically saved and loaded in a symbol library file (.lib).
 * Library symbols are different from schematic symbols.
 */
class LIB_SYMBOL : public EDA_ITEM, public LIB_TREE_ITEM
{
public:
    LIB_SYMBOL( const wxString& aName, LIB_SYMBOL* aParent = nullptr,
                SYMBOL_LIB* aLibrary = nullptr );

    LIB_SYMBOL( const LIB_SYMBOL& aSymbol, SYMBOL_LIB* aLibrary = nullptr );

    virtual ~LIB_SYMBOL()
    {}

    ///< http://www.boost.org/doc/libs/1_55_0/libs/smart_ptr/sp_techniques.html#weak_without_shared
    LIB_SYMBOL_SPTR SharedPtr() const { return m_me; }

    /**
     * Create a copy of a LIB_SYMBOL and assigns unique KIIDs to the copy and its children.
     */
    virtual LIB_SYMBOL* Duplicate() const
    {
        LIB_SYMBOL* dupe = new LIB_SYMBOL( *this, m_library );
        const_cast<KIID&>( dupe->m_Uuid ) = KIID();

        for( LIB_ITEM& item : dupe->m_drawings )
            const_cast<KIID&>( item.m_Uuid ) = KIID();

        return dupe;
    }

    void SetParent( LIB_SYMBOL* aParent = nullptr );
    LIB_SYMBOL_REF& GetParent() { return m_parent; }
    const LIB_SYMBOL_REF& GetParent() const { return m_parent; }

    /**
     * Get the number of parents for this symbol.
     *
     * @return the inhertance depth for this symbol.
     */
    unsigned GetInheritanceDepth() const;

    /**
     * Get the parent symbol that does not have another parent.
     *
     * Now that derived symbols can be derived from other derived symbols, this method provides
     * way to get to the base symbol in the derivation change.
     *
     * @return the weak_ptr to the root symbol of this symbol.
     */
    LIB_SYMBOL_SPTR GetRootSymbol() const;

    void ClearCaches();

    virtual wxString GetClass() const override
    {
        return wxT( "LIB_SYMBOL" );
    }

    static inline bool ClassOf( const EDA_ITEM* aItem )
    {
        return aItem && aItem->Type() == LIB_SYMBOL_T;
    }

    virtual void SetName( const wxString& aName );
    wxString GetName() const override { return m_name; }

    const LIB_ID& LibId() const { return m_libId; }
    LIB_ID& LibId() { return m_libId; }
    LIB_ID GetLibId() const override { return m_libId; }
    void SetLibId( const LIB_ID& aLibId ) { m_libId = aLibId; }

    LIB_ID GetSourceLibId() const { return m_sourceLibId; }
    void SetSourceLibId( const LIB_ID& aLibId ) { m_sourceLibId = aLibId; }

    wxString GetLibNickname() const override { return GetLibraryName(); }

    ///< Sets the Description field text value
    void SetDescription( const wxString& aDescription )
    {
        GetDescriptionField().SetText( aDescription );
    }

    ///< Gets the Description field text value */
    wxString GetDescription() override
    {
        if( GetDescriptionField().GetText().IsEmpty() && IsAlias() )
        {
            if( LIB_SYMBOL_SPTR parent = m_parent.lock() )
                return parent->GetDescription();
        }

        return GetDescriptionField().GetText();
    }

    void SetKeyWords( const wxString& aKeyWords ) { m_keyWords = aKeyWords; }

    wxString GetKeyWords() const
    {
        if( m_keyWords.IsEmpty() && IsAlias() )
        {
            if( LIB_SYMBOL_SPTR parent = m_parent.lock() )
                return parent->GetKeyWords();
        }

        return m_keyWords;
    }

    std::vector<SEARCH_TERM> GetSearchTerms() override;

    wxString GetFootprint() override
    {
        return GetFootprintField().GetText();
    }

    void GetChooserFields( std::map<wxString , wxString>& aColumnMap ) override;

    /**
     * For symbols derived from other symbols, IsRoot() indicates no derivation.
     */
    bool IsRoot() const override { return m_parent.use_count() == 0; }
    bool IsAlias() const { return !m_parent.expired() && m_parent.use_count() > 0; }

    const wxString GetLibraryName() const;

    SYMBOL_LIB* GetLib() const          { return m_library; }
    void SetLib( SYMBOL_LIB* aLibrary ) { m_library = aLibrary; }

    timestamp_t GetLastModDate() const { return m_lastModDate; }

    void SetFPFilters( const wxArrayString& aFilters ) { m_fpFilters = aFilters; }

    wxArrayString GetFPFilters() const
    {
        if( m_fpFilters.IsEmpty() && IsAlias() )
        {
            if( LIB_SYMBOL_SPTR parent = m_parent.lock() )
                return parent->GetFPFilters();
        }

        return m_fpFilters;
    }

    void ViewGetLayers( int aLayers[], int& aCount ) const override;

    /**
     * Get the bounding box for the symbol.
     *
     * @return the symbol bounding box ( in user coordinates )
     * @param aUnit = unit selection = 0, or 1..n
     * @param aBodyStyle = 0, 1 or 2
     *  If aUnit == 0, unit is not used
     *  if aBodyStyle == 0 Convert is non used
     * @param aIgnoreHiddenFields default true, ignores any hidden fields
     **/
    const BOX2I GetUnitBoundingBox( int aUnit, int aBodyStyle,
                                    bool aIgnoreHiddenFields = true ) const;

    /**
     * Get the symbol bounding box excluding fields.
     *
     * @return the symbol bounding box ( in user coordinates ) without fields
     * @param aUnit = unit selection = 0, or 1..n
     * @param aBodyStyle = 0, 1 or 2
     *  If aUnit == 0, unit is not used
     *  if aBodyStyle == 0 Convert is non used
     *  Fields are not taken in account
     **/
    const BOX2I GetBodyBoundingBox( int aUnit, int aBodyStyle, bool aIncludePins,
                                    bool aIncludePrivateItems ) const;

    const BOX2I GetBoundingBox() const override
    {
        return GetUnitBoundingBox( 0, 0 );
    }

    bool IsPower() const;
    bool IsNormal() const;

    void SetPower();
    void SetNormal();

    /**
     * Set interchangeable the property for symbol units.
     * @param aLockUnits when true then units are set as not interchangeable.
     */
    void LockUnits( bool aLockUnits ) { m_unitsLocked = aLockUnits; }

    /**
     * Check whether symbol units are interchangeable.
     * @return False when interchangeable, true otherwise.
     */
    bool UnitsLocked() const { return m_unitsLocked; }

    /**
     * Overwrite all the existing fields in this symbol with fields supplied in \a aFieldsList.
     *
     * @param aFieldsList is a set of fields to import, removing all previous fields.
     */
    void SetFields( const std::vector<LIB_FIELD>& aFieldsList );

    /**
     * Return a list of fields within this symbol.
     *
     * @param aList - List to add fields to
     */
    void GetFields( std::vector<LIB_FIELD*>& aList );
    void GetFields( std::vector<LIB_FIELD>& aList );

    /**
     * Add a field.  Takes ownership of the pointer.
     */
    void AddField( LIB_FIELD* aField );

    void AddField( LIB_FIELD& aField ) { AddField( new LIB_FIELD( aField ) ); }

    /**
     * Find a field within this symbol matching \a aFieldName and returns it
     * or NULL if not found.
     * @param aFieldName is the name of the field to find.
     * @param aCaseInsensitive ignore the filed name case if true.
     *
     * @return the field if found or NULL if the field was not found.
     */
    LIB_FIELD* FindField( const wxString& aFieldName, bool aCaseInsensitive = false );

    const LIB_FIELD* FindField( const wxString& aFieldName,
                                const bool      aCaseInsensitive = false ) const;

    /**
     * Return pointer to the requested field.
     *
     * @param aId - Id of field to return.
     * @return The field if found, otherwise NULL.
     */
    LIB_FIELD* GetFieldById( int aId ) const;

    /** Return reference to the value field. */
    LIB_FIELD& GetValueField();

    /** Return reference to the reference designator field. */
    LIB_FIELD& GetReferenceField();

    /** Return reference to the footprint field */
    LIB_FIELD& GetFootprintField();

    /** Return reference to the datasheet field. */
    LIB_FIELD& GetDatasheetField();

    /** Return reference to the description field. */
    LIB_FIELD& GetDescriptionField();

    wxString GetPrefix();

    void RunOnChildren( const std::function<void( LIB_ITEM* )>& aFunction );

    /**
     * Order optional field indices.
     *
     * It's possible when calling #LIB_SYMBOL::Flatten that there can be gaps and/or duplicate
     * optional field indices.  This method correctly orders the indices so there are no gaps
     * and/or duplicate indices.
     */
    int UpdateFieldOrdinals();

    int GetNextAvailableFieldId() const;

    /**
     * Print symbol.
     *
     * @param aOffset - Position of symbol.
     * @param aMulti - unit if multiple units per symbol.
     * @param aBodyStyle - Symbol alternate body style (DeMorgan) if available.
     * @param aOpts - Drawing options
     * @param aDimmed - Reduce brightness of symbol
     */
    void Print( const RENDER_SETTINGS* aSettings, const VECTOR2I& aOffset, int aMulti,
                int aBodyStyle, const LIB_SYMBOL_OPTIONS& aOpts, bool aDimmed );

    /**
     * Print just the background fills of a symbol
     *
     * @param aOffset - Position of symbol.
     * @param aMulti - unit if multiple units per symbol.
     * @param aBodyStyle - Symbol alternate body style (DeMorgan) if available.
     * @param aOpts - Drawing options
     * @param aDimmed - Reduce brightness of symbol
     */
    void PrintBackground( const RENDER_SETTINGS *aSettings, const VECTOR2I &aOffset, int aMulti,
                          int aBodyStyle, const LIB_SYMBOL_OPTIONS &aOpts, bool aDimmed );

    /**
     * Plot lib symbol to plotter.
     * Lib Fields not are plotted here, because this plot function
     * is used to plot schematic items, which have they own fields
     *
     * @param aPlotter - Plotter object to plot to.
     * @param aUnit - Symbol symbol to plot.
     * @param aBodyStyle - Symbol alternate body style to plot.
     * @param aBackground - A poor-man's Z-order.
     * @param aOffset - Distance to shift the plot coordinates.
     * @param aTransform - Symbol plot transform matrix.
     * @param aDimmed - Reduce brightness of symbol
     */
    void Plot( PLOTTER* aPlotter, int aUnit, int aBodyStyle, bool aBackground,
               const VECTOR2I& aOffset, const TRANSFORM& aTransform, bool aDimmed ) const;

    /**
     * Plot Lib Fields only of the symbol to plotter.
     * is used to plot the full lib symbol, outside the schematic
     *
     * @param aPlotter - Plotter object to plot to.
     * @param aUnit - Symbol to plot.
     * @param aBodyStyle - Symbol alternate body style to plot.
     * @param aBackground - A poor-man's Z-order.
     * @param aOffset - Distance to shift the plot coordinates.
     * @param aTransform - Symbol plot transform matrix.
     * @param aDimmed - reduce brightness of fields
     */
    void PlotLibFields( PLOTTER* aPlotter, int aUnit, int aBodyStyle, bool aBackground,
                        const VECTOR2I& aOffset, const TRANSFORM& aTransform, bool aDimmed,
                        bool aPlotHidden = true );

    /**
     * Add a new draw \a aItem to the draw object list and sort according to \a aSort.
     *
     * @param aItem is the new draw object to add to the symbol.
     * @param aSort is the flag to determine if the newly added item should be sorted.
     */
    void AddDrawItem( LIB_ITEM* aItem, bool aSort = true );

    /**
     * Remove draw \a aItem from list.
     *
     * @param aItem - Draw item to remove from list.
     */
    void RemoveDrawItem( LIB_ITEM* aItem );

    void RemoveField( LIB_FIELD* aField ) { RemoveDrawItem( aField ); }

    size_t GetFieldCount() const { return m_drawings.size( LIB_FIELD_T ); }

    /**
     * Return a list of pin object pointers from the draw item list.
     *
     * Note pin objects are owned by the draw list of the symbol.  Deleting any of the objects
     * will leave list in a unstable state and will likely segfault when the list is destroyed.
     *
     * @param aList - Pin list to place pin object pointers into.
     * @param aUnit - Unit number of pins to collect.  Set to 0 to get pins from any symbol unit.
     * @param aBodyStyle - Symbol alternate body style of pins to collect.  Set to 0 to get pins
     *                     from any DeMorgan variant of symbol.
     */
    void GetPins( LIB_PINS& aList, int aUnit = 0, int aBodyStyle = 0 ) const;

    /**
     * Return a list of pin pointers for all units / converts.  Used primarily for SPICE where
     * we want to treat all unit as a single part.
     */
    std::vector<LIB_PIN*> GetAllLibPins() const;

    /**
     * @return a count of pins for all units / converts.
     */
    int GetPinCount() override;

    /**
     * Return pin object with the requested pin \a aNumber.
     *
     * @param aNumber - Number of the pin to find.
     * @param aUnit - Unit filter.  Set to 0 if a specific unit number is not required.
     * @param aBodyStyle - DeMorgan variant filter.  Set to 0 if no specific DeMorgan variant is
     *                   required.
     * @return The pin object if found.  Otherwise NULL.
     */
    LIB_PIN* GetPin( const wxString& aNumber, int aUnit = 0, int aBodyStyle = 0 ) const;

    /**
     * Return true if this symbol's pins do not match another symbol's pins. This is used to
     * detect whether the project cache is out of sync with the system libs.
     *
     * @param aOtherSymbol - The other library symbol to test
     * @param aTestNums - Whether two pins at the same point must have the same number.
     * @param aTestNames - Whether two pins at the same point must have the same name.
     * @param aTestType - Whether two pins at the same point must have the same electrical type.
     * @param aTestOrientation - Whether two pins at the same point must have the same orientation.
     * @param aTestLength - Whether two pins at the same point must have the same length.
     */
    bool PinsConflictWith( const LIB_SYMBOL& aOtherSymbol, bool aTestNums, bool aTestNames,
                           bool aTestType, bool aTestOrientation, bool aTestLength ) const;

    /**
     * Move the symbol \a aOffset.
     *
     * @param aOffset - Offset displacement.
     */
    void SetOffset( const VECTOR2I& aOffset );

    /**
     * Remove duplicate draw items from list.
     */
    void RemoveDuplicateDrawItems();

    /**
     * Test if symbol has more than one body conversion type (DeMorgan).
     *
     * @return True if symbol has more than one conversion.
     */
    bool HasAlternateBodyStyle() const;

    /**
     * @return the highest pin number of the symbol's pins.
     * If none of the pins has pin number assigned it returns 0.
     */
    int GetMaxPinNumber() const;

    /**
     * Clears the status flag all draw objects in this symbol.
     */
    void ClearTempFlags();
    void ClearEditFlags();

    /**
     * Locate a draw object.
     *
     * @param aUnit - Unit number of draw item.
     * @param aBodyStyle - Body style of draw item.
     * @param aType - Draw object type, set to 0 to search for any type.
     * @param aPoint - Coordinate for hit testing.
     * @return The draw object if found.  Otherwise NULL.
     */
    LIB_ITEM* LocateDrawItem( int aUnit, int aBodyStyle, KICAD_T aType, const VECTOR2I& aPoint );

    /**
     * Locate a draw object (overlaid)
     *
     * @param aUnit - Unit number of draw item.
     * @param aBodyStyle - Body style of draw item.
     * @param aType - Draw object type, set to 0 to search for any type.
     * @param aPoint - Coordinate for hit testing.
     * @param aTransform = the transform matrix
     * @return The draw object if found.  Otherwise NULL.
     */
    LIB_ITEM* LocateDrawItem( int aUnit, int aBodyStyle, KICAD_T aType, const VECTOR2I& aPoint,
                              const TRANSFORM& aTransform );

    /**
     * Return a reference to the draw item list.
     *
     * @return LIB_ITEMS_CONTAINER& - Reference to the draw item object container.
     */
    LIB_ITEMS_CONTAINER& GetDrawItems() { return m_drawings; }
    const LIB_ITEMS_CONTAINER& GetDrawItems() const { return m_drawings; }

    /**
     * This function finds the filled draw items that are covering up smaller draw items
     * and replaces their body fill color with the background fill color.
    */
    void FixupDrawItems();

    INSPECT_RESULT Visit( INSPECTOR inspector, void* testData,
                          const std::vector<KICAD_T>& aScanTypes ) override;

    /**
     * Set the units per symbol count.
     *
     * If the count is greater than the current count, then the all of the
     * current draw items are duplicated for each additional symbol.  If the
     * count is less than the current count, all draw objects for units
     * greater that count are removed from the symbol.
     *
     * @param aCount - Number of units per package.
     * @param aDuplicateDrawItems Create duplicate draw items of unit 1 for each additionl unit.
     */
    void SetUnitCount( int aCount, bool aDuplicateDrawItems = true );
    int GetUnitCount() const override;

    /**
     * Return an identifier for \a aUnit for symbols with units.
     */
    wxString GetUnitReference( int aUnit ) override;

    /**
     * Return true if the given unit \a aUnit has a display name defined
     */
    bool HasUnitDisplayName( int aUnit ) override;

    /**
     * Return the user-defined display name for \a aUnit for symbols with units.
     */
    wxString GetUnitDisplayName( int aUnit ) override;

    /**
     * Copy all unit display names into the given map \a aTarget
     */
    void CopyUnitDisplayNames( std::map<int, wxString>& aTarget ) const;

    /**
     * Set the user-defined display name for \a aUnit to \a aName for symbols with units.
     */
    void SetUnitDisplayName( int aUnit, const wxString& aName );

    /**
     * @return true if the symbol has multiple units per symbol.
     * When true, the reference has a sub reference to identify symbol.
     */
    bool IsMulti() const { return m_unitCount > 1; }

    static wxString LetterSubReference( int aUnit, int aFirstId );

    /**
     * Set or clear the alternate body style (DeMorgan) for the symbol.
     *
     * If the symbol already has an alternate body style set and aHasAlternate is false, all
     * of the existing draw items for the alternate body style are remove.  If the alternate
     * body style is not set and aHasAlternate is true, than the base draw items are duplicated
     * and added to the symbol.
     *
     * @param aHasAlternate - Set or clear the symbol alternate body style.
     * @param aDuplicatePins - Duplicate all pins from original body style if true.
     */
    void SetHasAlternateBodyStyle( bool aHasAlternate, bool aDuplicatePins = true );

    /**
     * Set the offset in mils of the pin name text from the pin symbol.
     *
     * Set the offset to 0 to draw the pin name above the pin symbol.
     *
     * @param aOffset - The offset in mils.
     */
    void SetPinNameOffset( int aOffset ) { m_pinNameOffset = aOffset; }
    int GetPinNameOffset() const { return m_pinNameOffset; }

    /**
     * Set or clear the pin name visibility flag.
     *
     * @param aShow - True to make the symbol pin names visible.
     */
    void SetShowPinNames( bool aShow ) { m_showPinNames = aShow; }
    bool ShowPinNames() const { return m_showPinNames; }

    /**
     * Set or clear the pin number visibility flag.
     *
     * @param aShow - True to make the symbol pin numbers visible.
     */
    void SetShowPinNumbers( bool aShow ) { m_showPinNumbers = aShow; }
    bool ShowPinNumbers() const { return m_showPinNumbers; }

    /**
     * Set or clear the exclude from simulation flag.
     *
     * @param aExcludeFromSim true to exclude symbol from simulation
     */
    void SetExcludedFromSim( bool aExcludeFromSim ) { m_excludedFromSim = aExcludeFromSim; }
    bool GetExcludedFromSim() const { return m_excludedFromSim; }

    /**
     * Set or clear the exclude from schematic bill of materials flag.
     *
     * @param aExcludeFromBOM true to exclude symbol from schematic bill of materials
     */
    void SetExcludedFromBOM( bool aExcludeFromBOM ) { m_excludedFromBOM = aExcludeFromBOM; }
    bool GetExcludedFromBOM() const { return m_excludedFromBOM; }

    /**
     * Set or clear exclude from board netlist flag.
     *
     * @param aExcludeFromBoard true to exclude symbol from the board netlist
     */
    void SetExcludedFromBoard( bool aExcludeFromBoard ) { m_excludedFromBoard = aExcludeFromBoard; }
    bool GetExcludedFromBoard() const { return m_excludedFromBoard; }

    /**
     * Comparison test that can be used for operators.
     *
     * @param aRhs is the right hand side symbol used for comparison.
     *
     * @return -1 if this symbol is less than \a aRhs
     *         1 if this symbol is greater than \a aRhs
     *         0 if this symbol is the same as \a aRhs
     */
    int Compare( const LIB_SYMBOL& aRhs, int aCompareFlags = 0,
                 REPORTER* aReporter = nullptr ) const;

    bool operator==( const LIB_SYMBOL* aSymbol ) const { return this == aSymbol; }
    bool operator==( const LIB_SYMBOL& aSymbol ) const;
    bool operator!=( const LIB_SYMBOL& aSymbol ) const
    {
        return Compare( aSymbol, LIB_ITEM::COMPARE_FLAGS::EQUALITY ) != 0;
    }

    const LIB_SYMBOL& operator=( const LIB_SYMBOL& aSymbol );

    /**
     * Return a flattened symbol inheritance to the caller.
     *
     * If the symbol does not inherit from another symbol, a copy of the symbol is returned.
     *
     * @return a flattened symbol on the heap
     */
    std::unique_ptr< LIB_SYMBOL > Flatten() const;

    /**
     * Return a list of LIB_ITEM objects separated by unit and convert number.
     *
     * @note This does not include LIB_FIELD objects since they are not associated with
     *       unit and/or convert numbers.
     */
    std::vector<struct LIB_SYMBOL_UNIT> GetUnitDrawItems();

    /**
     * Return a list of unit numbers that are unique to this symbol.
     *
     * If the symbol is inherited (alias), the unique units of the parent symbol are returned.
     * When comparing pins, the pin number is ignored.
     *
     * @return a list of unique unit numbers and their associated draw items.
     */
    std::vector<struct LIB_SYMBOL_UNIT> GetUniqueUnits();

    /**
     * Return a list of item pointers for \a aUnit and \a aBodyStyle for this symbol.
     *
     * @note #LIB_FIELD objects are not included.
     *
     * @param aUnit is the unit number of the item, -1 includes all units.
     * @param aBodyStyle is the alternate body styple of the item, -1 includes all body styles.
     *
     * @return a list of unit items.
     */
    std::vector<LIB_ITEM*> GetUnitDrawItems( int aUnit, int aBodyStyle );

    /**
     * Return a measure of similarity between this symbol and \a aSymbol.
     * @param aSymbol is the symbol to compare to.
     *
     * @return a measure of similarity from 1.0 (identical) to 0.0 (no similarity).
    */
    double Similarity( const LIB_SYMBOL& aSymbol ) const;
#if defined(DEBUG)
    void Show( int nestLevel, std::ostream& os ) const override { ShowDummy( os ); }
#endif

private:
    // We create a different set parent function for this class, so we hide the inherited one.
    using EDA_ITEM::SetParent;

    void deleteAllFields();

private:
    LIB_SYMBOL_SPTR     m_me;
    LIB_SYMBOL_REF      m_parent;           ///< Use for inherited symbols.
    LIB_ID              m_libId;
    LIB_ID              m_sourceLibId;      ///< For database library symbols; the original symbol
    timestamp_t         m_lastModDate;

    int                 m_unitCount;        ///< Number of units (parts) per package.
    bool                m_unitsLocked;      ///< True if symbol has multiple units and changing one
                                            ///< unit does not automatically change another unit.

    int                 m_pinNameOffset;    ///< The offset in mils to draw the pin name.  Set to
                                            ///< 0 to draw the pin name above the pin.
    bool                m_showPinNames;
    bool                m_showPinNumbers;

    bool                m_excludedFromSim;
    bool                m_excludedFromBOM;
    bool                m_excludedFromBoard;
    LIBRENTRYOPTIONS    m_options;          ///< Special symbol features such as POWER or NORMAL.)

    LIB_ITEMS_CONTAINER m_drawings;

    SYMBOL_LIB*         m_library;
    wxString            m_name;
    wxString            m_keyWords;         ///< Search keywords
    wxArrayString       m_fpFilters;        ///< List of suitable footprint names for the
                                            ///<  symbol (wild card names accepted).

    std::map<int, wxString> m_unitDisplayNames;
};

#endif  //  CLASS_LIBENTRY_H