/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 2011 Wayne Stambaugh <stambaughw@gmail.com>
 * Copyright (C) 1992-2021 KiCad Developers, see AUTHORS.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
 */

/**
 * @file sch_sheet_path.h
 * Definition of the SCH_SHEET_PATH and SCH_SHEET_LIST classes for Eeschema.
 */

#ifndef CLASS_DRAWSHEET_PATH_H
#define CLASS_DRAWSHEET_PATH_H

#include <eda_item.h>
#include <erc_item.h>

#include <map>


/**
 * A simple container for schematic symbol instance information.
 */
struct SYMBOL_INSTANCE_REFERENCE
{
    KIID_PATH m_Path;

    // Things that can be annotated:
    wxString  m_Reference;
    int       m_Unit;

    // Things that can be back-annotated:
    wxString  m_Value;
    wxString  m_Footprint;
};


/**
 * A simple container for sheet instance information.
 */
struct SCH_SHEET_INSTANCE
{
    KIID_PATH m_Path;

    wxString  m_PageNumber;
};


/**
 * Complex hierarchies
 *
 * A hierarchical schematic uses sheets (hierarchical sheets) included in a given sheet.
 * Each sheet corresponds to a schematic drawing handled by a SCH_SCREEN structure.  A
 * SCH_SCREEN structure contains drawings, and have a filename to write it's data.  Also a
 * SCH_SCREEN displays a sheet number and the name of the sheet.
 *
 * In simple (and flat) hierarchies a sheet is linked to a SCH_SCREEN, and a SCH_SCREEN is
 * used by the single hierarchical sheet.
 *
 * In complex hierarchies the same SCH_SCREEN (and its data) is shared by more than one sheet.
 * Therefore subsheets (like subsheets in a SCH_SCREEN shared by many sheets) can also be
 * shared. So the same SCH_SCREEN must handle different symbol references and unit selections
 * depending on which sheet is currently selected, and how a given subsheet is selected. Two
 * sheets share the same SCH_SCREEN (the same drawings) if they have the same filename.
 *
 * In KiCad each symbol and sheet receives (when created) a uuid.  So each sheet has 2 id: its
 * uuid (which cannot change) and its name (that can be edited and therefore is not reliable
 * for strong identification).
 * A given sheet in a hierarchy is fully labeled by its path (or sheet path) that is the list
 * of uuids found to access it through the hierarchy.  The root sheet is /.  All  other sheets
 * have a path like /1234ABCD or /4567FEDC/AA2233DD/.  This path can be displayed as human
 * readable sheet name like: / or /sheet1/include_sheet/ or /sheet2/include_sheet/
 *
 * So to know for a given SCH_SCREEN (a given schematic drawings) we must:
 *   1) Handle all references possibilities.
 *   2) When acceded by a given selected sheet, display (update) the
 *      corresponding references and sheet path
 *
 * The class SCH_SHEET_PATH handles paths used to access a sheet.  The class SCH_SHEET_LIST
 * allows one to handle the full (or partial) list of sheets and their paths in a complex
 * hierarchy.  The class EDA_ScreenList allows one to handle the list of SCH_SCREEN. It is
 * useful  to clear or save data, but is not suitable to handle the full complex hierarchy
 * possibilities (usable in flat and simple hierarchies).
 */


class wxFindReplaceData;
class SCH_SHEET;
class SCH_SCREEN;
class SCH_MARKER;
class SCH_ITEM;
class SCH_REFERENCE_LIST;


/**
 * Container to map reference designators for multi-unit parts.
 */
typedef std::map<wxString, SCH_REFERENCE_LIST> SCH_MULTI_UNIT_REFERENCE_MAP;

/**
 * Handle access to a stack of flattened #SCH_SHEET objects by way of a path for
 * creating a flattened schematic hierarchy.
 *
 * <p>
 * The #SCH_SHEET objects are stored in a list from first (usually the root sheet) to a
 * given sheet in last position.  The _last_ sheet is usually the sheet we want to select
 * or reach (which is what the function Last() returns).   Others sheets constitute the
 * "path" from the first to the last sheet.
 * </p>
 */
class SCH_SHEET_PATH
{
protected:
    std::vector< SCH_SHEET* > m_sheets;

    size_t m_current_hash;

    int m_virtualPageNumber;           /// Page numbers are maintained by the sheet load order.

    std::map<std::pair<wxString, wxString>, bool> m_recursion_test_cache;

public:
    SCH_SHEET_PATH();

    SCH_SHEET_PATH( const SCH_SHEET_PATH& aOther );

    SCH_SHEET_PATH& operator=( const SCH_SHEET_PATH& aOther );

    ~SCH_SHEET_PATH() = default;

    /// Forwarded method from std::vector
    SCH_SHEET* at( size_t aIndex ) const { return m_sheets.at( aIndex ); }

    /// Forwarded method from std::vector
    void clear()
    {
        m_sheets.clear();
        Rehash();
    }

    /// Forwarded method from std::vector
    bool empty() const { return m_sheets.empty(); }

    /// Forwarded method from std::vector
    void pop_back()
    {
        m_sheets.pop_back();
        Rehash();
    }

    /// Forwarded method from std::vector
    void push_back( SCH_SHEET* aSheet )
    {
        m_sheets.push_back( aSheet );
        Rehash();
    }

    /// Forwarded method from std::vector
    size_t size() const { return m_sheets.size(); }

    void Rehash();

    size_t GetCurrentHash() const { return m_current_hash; }

    /**
     * Set the sheet instance virtual page number.
     *
     * Virtual page numbers are incremental integers set automatically when the sheet path
     * hierarchy is created (@see #SCH_SHEET_LIST::BuildSheetList).  The virtual page
     * numbering is ordered by the X and Y position of the sheet in a schematic which
     * mimics the page numbering code prior to the addition of actual user definable page
     * numbers.  Virtual page numbers should only be use when annotating schematics.
     */
    void SetVirtualPageNumber( int aPageNumber ) { m_virtualPageNumber = aPageNumber; }

    int GetVirtualPageNumber() const { return m_virtualPageNumber; }

    /**
     * Set the sheet instance user definable page number.
     *
     * @note User definable page numbers can be any string devoid of white space characters.
     */
    void SetPageNumber( const wxString& aPageNumber );

    wxString GetPageNumber() const;

    const SCH_SHEET* GetSheet( unsigned aIndex ) const
    {
        SCH_SHEET* retv = NULL;

        if( aIndex < size() )
            retv = at( aIndex );

        return retv;
    }

    /**
     * Compare if this is the same sheet path as aSheetPathToTest
     *
     * @param aSheetPathToTest = sheet path to compare
     * @return 1 if this sheet path has more sheets than aSheetPathToTest,
     *   -1 if this sheet path has fewer sheets than aSheetPathToTest,
     *   or 0 if same
     */
    int Cmp( const SCH_SHEET_PATH& aSheetPathToTest ) const;

    /**
     * Return a pointer to the last #SCH_SHEET of the list.
     *
     * One can see the others sheet as the "path" to reach this last sheet.
     */
    SCH_SHEET* Last() const;

    /**
     * @return the #SCH_SCREEN relative to the last sheet in list.
     */
    SCH_SCREEN* LastScreen();


    ///< @copydoc SCH_SHEET_PATH::LastScreen()
    SCH_SCREEN* LastScreen() const;

    /**
     * Return the path of time stamps which do not changes even when editing sheet parameters.
     *
     * A path is something like / (root) or /34005677 or /34005677/00AE4523.
     */
    wxString PathAsString() const;

    /**
     * Get the sheet path as an #KIID_PATH.
     *
     * @note This #KIID_PATH includes the root sheet UUID prefixed to the path.
     * @return
     */
    KIID_PATH Path() const;

    /**
     * Get the sheet path as an #KIID_PATH without the root sheet UUID prefix.
     *
     * @note This #KIID_PATH does not include the root sheet UUID prefixed to the path.
     * @return
     */
    KIID_PATH PathWithoutRootUuid() const;

    /**
     * Return the sheet path in a human readable form made from the sheet names.
     *
     * The the "normal" path instead uses the #KIID objects in the path that do not change
     * even when editing sheet parameters.
     */
    wxString PathHumanReadable( bool aUseShortRootName = true ) const;

    /**
     * Update all the symbol references for this sheet path.
     *
     * Mandatory in complex hierarchies because sheets may use the same screen (basic schematic)
     * more than once but with different references and units according to the displayed sheet.
     */
    void UpdateAllScreenReferences();

    /**
     * Adds #SCH_REFERENCE object to \a aReferences for each component in the sheet.
     *
     * @param aReferences List of references to populate.
     * @param aIncludePowerSymbols : false to only get normal components.
     * @param aForceIncludeOrphanComponents : true to include components having no symbol found
     * in lib.
     * ( orphan components)
     * The normal option is false, and set to true only to build the full list of components.
     */
    void GetSymbols( SCH_REFERENCE_LIST& aReferences, bool aIncludePowerSymbols = true,
                     bool aForceIncludeOrphanComponents = false ) const;

    /**
     * Add a #SCH_REFERENCE_LIST object to \a aRefList for each same-reference set of
     * multi-unit parts in the sheet.
     *
     * The map key for each element will be the reference designator.
     *
     * @param aRefList Map of reference designators to reference lists
     * @param aIncludePowerSymbols : false to only get normal components.
     */
    void GetMultiUnitComponents( SCH_MULTI_UNIT_REFERENCE_MAP &aRefList,
                                 bool aIncludePowerSymbols = true ) const;

    /**
     * Test the SCH_SHEET_PATH file names to check adding the sheet stored in the file
     * \a aSrcFileName to the sheet stored in file \a aDestFileName  will cause a sheet
     * path recursion.
     *
     * @param aSrcFileName is the source file name of the sheet add to \a aDestFileName.
     * @param aDestFileName is the file name of the destination sheet for \a aSrcFileName.
     * @return true if \a aFileName will cause recursion in the sheet path.  Otherwise false.
     */
    bool TestForRecursion( const wxString& aSrcFileName, const wxString& aDestFileName );

    bool operator==( const SCH_SHEET_PATH& d1 ) const;

    bool operator!=( const SCH_SHEET_PATH& d1 ) const { return !( *this == d1 ) ; }

    bool operator<( const SCH_SHEET_PATH& d1 ) const { return m_sheets < d1.m_sheets; }

private:

    void initFromOther( const SCH_SHEET_PATH& aOther );
};


namespace std
{
    template<> struct hash<SCH_SHEET_PATH>
    {
        size_t operator()( const SCH_SHEET_PATH& path ) const;
    };
}


typedef std::vector< SCH_SHEET_PATH >            SCH_SHEET_PATHS;
typedef SCH_SHEET_PATHS::iterator                SCH_SHEET_PATHS_ITER;


/**
 * A container for handling #SCH_SHEET_PATH objects in a flattened hierarchy.
 *
 * #SCH_SHEET objects are not unique, there can be many sheets with the same filename and
 * that share the same #SCH_SCREEN reference.   Each The schematic file (#SCH_SCREEN) may
 * be shared between these sheets and component references are specific to a sheet path.
 * When a sheet is entered, component references and sheet page number are updated.
 */
class SCH_SHEET_LIST : public SCH_SHEET_PATHS
{
private:
    SCH_SHEET_PATH  m_currentSheetPath;

public:

    /**
     * Construct a flattened list of SCH_SHEET_PATH objects from \a aSheet.
     *
     * If aSheet == NULL, then this is an empty hierarchy which the user can populate.
     */
    SCH_SHEET_LIST( SCH_SHEET* aSheet = nullptr, bool aCheckIntegrity = false );

    ~SCH_SHEET_LIST() {}

    /**
     * Check the entire hierarchy for any modifications.
     *
     * @return True if the hierarchy is modified otherwise false.
     */
    bool IsModified() const;

    void ClearModifyStatus();

    /**
     * Fetch a SCH_ITEM by ID.  Also returns the sheet the item was found on in \a aPathOut.
     */
    SCH_ITEM* GetItem( const KIID& aID, SCH_SHEET_PATH* aPathOut = nullptr ) const;

    /**
     * Fill an item cache for temporary use when many items need to be fetched.
     */
    void FillItemMap( std::map<KIID, EDA_ITEM*>& aMap );

    /**
     * Silently annotate the not yet annotated power symbols of the entire hierarchy of the
     * sheet path list.
     *
     * It is called before creating a netlist, to annotate power symbols, without prompting
     * the user about not annotated or duplicate for these symbols, if only these symbols
     * need annotation ( a very frequent case ).
     */
    void AnnotatePowerSymbols();

    /**
     * Add a #SCH_REFERENCE object to \a aReferences for each component in the list
     * of sheets.
     *
     * @param aReferences List of references to populate.
     * @param aIncludePowerSymbols Set to false to only get normal components.
     * @param aForceIncludeOrphanComponents : true to include components having no symbol found
     * in lib.
     * ( orphan components)
     * The normal option is false, and set to true only to build the full list of components.
     */
    void GetSymbols( SCH_REFERENCE_LIST& aReferences, bool aIncludePowerSymbols = true,
                     bool aForceIncludeOrphanComponents = false ) const;

    /**
     * Add a #SCH_REFERENCE_LIST object to \a aRefList for each same-reference set of
     * multi-unit parts in the list of sheets. The map key for each element will be the
     * reference designator.
     *
     * @param aRefList Map of reference designators to reference lists
     * @param aIncludePowerSymbols Set to false to only get normal components.
     */
    void GetMultiUnitSymbols( SCH_MULTI_UNIT_REFERENCE_MAP &aRefList,
                              bool aIncludePowerSymbols = true ) const;

    /**
     * Test every #SCH_SHEET_PATH in this #SCH_SHEET_LIST to verify if adding the sheets stored
     * in \a aSrcSheetHierarchy to the sheet stored in \a aDestFileName  will cause recursion.
     *
     * @param aSrcSheetHierarchy is the SCH_SHEET_LIST of the source sheet add to \a aDestFileName.
     * @param aDestFileName is the file name of the destination sheet for \a aSrcFileName.
     * @return true if \a aFileName will cause recursion in the sheet path.  Otherwise false.
     */
    bool TestForRecursion( const SCH_SHEET_LIST& aSrcSheetHierarchy,
                           const wxString& aDestFileName );

    /**
     * Return a pointer to the first #SCH_SHEET_PATH object (not necessarily the only one) using
     * a particular screen.
     */
    SCH_SHEET_PATH* FindSheetForScreen( const SCH_SCREEN* aScreen );

    /**
     * Build the list of sheets and their sheet path from \a aSheet.
     *
     * If \a aSheet is the root sheet, the full sheet path and sheet list are built.
     *
     * The list will be ordered as per #SCH_SCREEN::GetSheets which results in sheets being ordered
     * in the legacy way of using the X and Y positions of the sheets.
     *
     * @see #SortByPageNumbers to sort by page numbers
     *
     * @param aSheet is the starting sheet from which the list is built, or NULL
     *               indicating that g_RootSheet should be used.
     * @throw std::bad_alloc if the memory for the sheet path list could not be allocated.
     */
    void BuildSheetList( SCH_SHEET* aSheet, bool aCheckIntegrity );

    /**
     * Sorts the list of sheets by page number. This should be called after #BuildSheetList
     *
     * @param aUpdateVirtualPageNums If true, updates the virtual page numbers to match the new
     * ordering
     */
    void SortByPageNumbers( bool aUpdateVirtualPageNums = true );

    bool NameExists( const wxString& aSheetName ) const;

    /**
     * Update all of the symbol instance information using \a aSymbolInstances.
     * WARNING: Do not call this on anything other than the full hierarchy.
     * @param aSymbolInstances is the symbol path information loaded from the root schematic.
     */
    void UpdateSymbolInstances( const std::vector<SYMBOL_INSTANCE_REFERENCE>& aSymbolInstances );

    /**
     * Update all of the sheet instance information using \a aSheetInstances.
     *
     * @warning Do not call this on anything other than the full hierarchy.
     *
     * @param aSymbolInstances is the symbol path information loaded from the root schematic.
     */
    void UpdateSheetInstances( const std::vector<SCH_SHEET_INSTANCE>& aSheetInstances );

    std::vector<KIID_PATH> GetPaths() const;

    /**
     * Update all of the symbol sheet paths to the sheet paths defined in \a aOldSheetPaths.
     *
     * @note The list of old sheet paths must be the exact same size and order as the existing
     *       sheet paths.  This should not be an issue if no new sheets where added between the
     *       creation of this sheet list and \a aOldSheetPaths.  This should only be called
     *       when updating legacy schematics to the new schematic file format.  Once this
     *       happens, the schematic cannot be save to the legacy file format because the
     *       time stamp part of UUIDs are no longer guaranteed to be unique.
     *
     * @param aOldSheetPaths is the #SHEET_PATH_LIST to update from.
     */
    void ReplaceLegacySheetPaths( const std::vector<KIID_PATH>& aOldSheetPaths );

    /**
     * Check all of the sheet instance for empty page numbers.
     *
     * @note This should only return true when loading a legacy schematic or an s-expression
     *       schematic before version 20201005.
     *
     * @return true if all sheet instance page numbers are not defined.  Otherwise false.
     */
    bool AllSheetPageNumbersEmpty() const;

    /**
     * Set initial sheet page numbers.
     *
     * The number scheme is base on the old psuedo sheet numbering algorithm prior to
     * the implementation of user definable sheet page numbers.
     */
    void SetInitialPageNumbers();
};

#endif // CLASS_DRAWSHEET_PATH_H