/*****************************************************************************/
/*  sch_item_struct.h :  Basic classes for most eeschema items descriptions  */
/*****************************************************************************/

#ifndef SCH_ITEM_STRUCT_H
#define SCH_ITEM_STRUCT_H

#include <vector>
#include <class_base_screen.h>

using namespace std;


class SCH_ITEM;
class LINE_READER;
class WinEDA_SchematicFrame;
class wxFindReplaceData;


enum DANGLING_END_T {
    UNKNOWN = 0,
    WIRE_START_END,
    WIRE_END_END,
    BUS_START_END,
    BUS_END_END,
    JUNCTION_END,
    PIN_END,
    LABEL_END,
    ENTRY_END,
    SHEET_LABEL_END
};

// A helper class to store a list of items that can be connected to something:
class DANGLING_END_ITEM
{
public:
    const void*    m_Item;         // a pointer to the parent
    wxPoint        m_Pos;          // the position of the connecting point
    DANGLING_END_T m_Type;         // type of parent

    DANGLING_END_ITEM( DANGLING_END_T type, const void* aItem )
    {
        m_Item = aItem;
        m_Type = type;
    }
};


/**
 * Class SCH_ITEM
 * is a base class for any item which can be embedded within the SCHEMATIC
 * container class, and therefore instances of derived classes should only be
 * found in EESCHEMA or other programs that use class SCHEMATIC and its contents.
 * The corresponding class in PCBNEW is BOARD_ITEM.
 */
class SCH_ITEM : public EDA_BaseStruct
{
protected:
    int            m_Layer;
    EDA_ITEMS      m_connections;   ///< List of items connected to this item.

public:
    SCH_ITEM( EDA_BaseStruct* aParent,  KICAD_T aType );

    ~SCH_ITEM();

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

    SCH_ITEM* Next() { return (SCH_ITEM*) Pnext; }
    SCH_ITEM* Back() { return (SCH_ITEM*) Pback; }

    /**
     * Function GetLayer
     * returns the layer this item is on.
     */
    int GetLayer() const { return m_Layer; }

    /**
     * Function SetLayer
     * sets the layer this item is on.
     * @param aLayer The layer number.
     */
    void  SetLayer( int aLayer )  { m_Layer = aLayer; }

    /**
     * Function GetPenSize virtual pure
     * @return the size of the "pen" that be used to draw or plot this item
     */
    virtual int GetPenSize( ) = 0;

    /**
     * Function Draw
     */
    virtual void    Draw( WinEDA_DrawPanel* panel,
                          wxDC*             DC,
                          const wxPoint&    offset,
                          int               draw_mode,
                          int               Color = -1 ) = 0;


    /* Place function */
    virtual void    Place( WinEDA_SchematicFrame* frame, wxDC* DC );

    // Geometric transforms (used in block operations):
    /** virtual function Move
     * move item to a new position.
     * @param aMoveVector = the deplacement vector
     */
    virtual void Move( const wxPoint& aMoveVector ) = 0;

    /** virtual function Mirror_Y
     * mirror item relative to an Y axis
     * @param aYaxis_position = the y axis position
     */
    virtual void Mirror_Y( int aYaxis_position ) = 0;
    virtual void Mirror_X( int aXaxis_position ) = 0;
    virtual void Rotate( wxPoint rotationPoint ) = 0;


    /**
     * Function Save
     * writes the data structures for this object out to a FILE in "*.sch"
     * format.
     * @param aFile The FILE to write to.
     * @return bool - true if success writing else false.
     */
    virtual bool    Save( FILE* aFile ) const = 0;

    /**
     * Load schematic item from \a aLine in a .sch file.
     *
     * @param aLine - Essentially this is file to read the object from.
     * @param aErrorMsg - Description of the error if an error occurs while loading the object.
     * @return True if the object loaded successfully.
     */
    virtual bool Load( LINE_READER& aLine, wxString& aErrorMsg ) { return false; }

    /**
     * Compare schematic item against search string.
     *
     * The base class returns false since many of the objects derived from
     * SCH_ITEM do not have any text to search.
     *
     * @todo - This should probably be pushed down to EDA_BaseStruct so that
     *         searches can be done on all of the Kicad applications that use
     *         objects derived from EDA_BaseStruct.
     *
     * @param aSearchData - The search criteria.
     * @param aAuxData - a pointer on auxiliary data, if needed (NULL if not used).
     *        When searching string in REFERENCE field we must know the sheet path
     *          This param is used in such cases
     * @param aFindLocation - a wxPoint where to put the location of matched item. can be NULL.
     * @return True if this schematic text item matches the search criteria.
     */
    virtual bool Matches( wxFindReplaceData& aSearchData, void* aAuxData, wxPoint* aFindLocation )
        { return false; }

    /**
     * Compare schematic item against search string.
     *
     * @param aText - String test.
     * @param aSearchData - The criteria to search against.
     * @return True if this item matches the search criteria.
     */
    bool Matches( const wxString& aText, wxFindReplaceData& aSearchData );

    /**
     * Add schematic item end points to \a aItemList if the item has endpoints.
     *
     * The default version doesn't do anything since many of the schematic object cannot
     * be tested for dangling ends.  If you add a new schematic item that can have a
     * dangling end ( no connect ), override this method to provide the correct end
     * points.
     *
     * @param aItemList - List of DANGLING_END_ITEMS to add to.
     */
    virtual void GetEndPoints( vector< DANGLING_END_ITEM >& aItemList ) {}

    /**
     * Test the schematic item to \a aItemList to check if it's dangling state has changed.
     *
     * Note that the return value only true when the state of the test has changed.  Use
     * the IsDangling() method to get the current dangling state of the item.  Some of
     * the schematic objects cannot be tested for a dangling state, the default method
     * always returns false.  Only override the method if the item can be tested for a
     * dangling state.
     *
     * @param aItemList - List of items to test item against.
     * @return True if the dangling state has changed from it's current setting.
     */
    virtual bool IsDanglingStateChanged( vector< DANGLING_END_ITEM >& aItemList ) { return false; }

    virtual bool IsDangling() const { return false; }

    /**
     * Check if the selection state of an item  inside \a aRect has changed.
     *
     * The is used by the block selection code to verify if an item is selected or not.
     * True is be return anytime the select state changes.  If you need to know the
     * the current selection state, use the IsSelected() method.
     *
     * @param aRect - Rectange to test against.
     */
    virtual bool IsSelectStateChanged( const wxRect& aRect ) { return false; }

    /**
     * Get a list of connection points for this item.
     *
     * Not all schematic items have connection points so the default method does nothing.
     *
     * @param aPoints - List of connection points to add to.
     */
    virtual void GetConnectionPoints( vector< wxPoint >& aPoints ) const { }

    /**
     * Clear all of the connection items from the list.
     *
     * The vector release method is used to prevent the item pointers from being deleted.
     * Do not use the vector erase method on the connection list.
     */
    void ClearConnections() { m_connections.release(); }
};

#endif /* SCH_ITEM_STRUCT_H */