/******************/
/* Class SCH_LINE */
/******************/

#include "fctsys.h"
#include "gr_basic.h"
#include "macros.h"
#include "class_drawpanel.h"
#include "trigo.h"
#include "richio.h"

#include "general.h"
#include "protos.h"
#include "sch_line.h"

#include <boost/foreach.hpp>


SCH_LINE::SCH_LINE( const wxPoint& pos, int layer ) :
    SCH_ITEM( NULL, SCH_LINE_T )
{
    m_Start = pos;
    m_End   = pos;
    m_Width = 0;        // Default thickness used
    m_StartIsDangling = m_EndIsDangling = FALSE;

    switch( layer )
    {
    default:
        m_Layer = LAYER_NOTES;
        break;

    case LAYER_WIRE:
        m_Layer = LAYER_WIRE;
        break;

    case LAYER_BUS:
        m_Layer = LAYER_BUS;
        break;
    }
}


SCH_LINE::SCH_LINE( const SCH_LINE& aLine ) :
    SCH_ITEM( aLine )
{
    m_Start = aLine.m_Start;
    m_End = aLine.m_End;
    m_Width = aLine.m_Width;
    m_StartIsDangling = m_EndIsDangling = false;
}


EDA_ITEM* SCH_LINE::doClone() const
{
    return new SCH_LINE( *this );
}


void SCH_LINE::Move( const wxPoint& aOffset )
{
    if( (m_Flags & STARTPOINT) == 0 && aOffset != wxPoint( 0, 0 ) )
    {
        m_Start += aOffset;
        SetModified();
    }

    if( (m_Flags & ENDPOINT) == 0 && aOffset != wxPoint( 0, 0 ) )
    {
        m_End += aOffset;
        SetModified();
    }
}


#if defined(DEBUG)

void SCH_LINE::Show( int nestLevel, std::ostream& os ) const
{
    NestedSpace( nestLevel, os ) << '<' << GetClass().Lower().mb_str()
                                 << " layer=\"" << m_Layer << '"'
                                 << " width=\"" << m_Width << '"'
                                 << " startIsDangling=\"" << m_StartIsDangling
                                 << '"' << " endIsDangling=\""
                                 << m_EndIsDangling << '"' << ">"
                                 << " <start" << m_Start << "/>"
                                 << " <end" << m_End << "/>" << "</"
                                 << GetClass().Lower().mb_str() << ">\n";
}

#endif


EDA_Rect SCH_LINE::GetBoundingBox() const
{
    int      width = 25;

    int      xmin = MIN( m_Start.x, m_End.x ) - width;
    int      ymin = MIN( m_Start.y, m_End.y ) - width;

    int      xmax = MAX( m_Start.x, m_End.x ) + width;
    int      ymax = MAX( m_Start.y, m_End.y ) + width;

    // return a rectangle which is [pos,dim) in nature.  therefore the +1
    EDA_Rect ret( wxPoint( xmin, ymin ), wxSize( xmax - xmin + 1, ymax - ymin + 1 ) );

    return ret;
}


bool SCH_LINE::Save( FILE* aFile ) const
{
    bool        success = true;

    const char* layer = "Notes";
    const char* width = "Line";

    if( GetLayer() == LAYER_WIRE )
        layer = "Wire";

    if( GetLayer() == LAYER_BUS )
        layer = "Bus";

    if( fprintf( aFile, "Wire %s %s\n", layer, width ) == EOF )
    {
        success = false;
    }

    if( fprintf( aFile, "\t%-4d %-4d %-4d %-4d\n", m_Start.x, m_Start.y,
                 m_End.x, m_End.y ) == EOF )
    {
        success = false;
    }

    return success;
}


bool SCH_LINE::Load( LINE_READER& aLine, wxString& aErrorMsg )
{
    char  Name1[256];
    char  Name2[256];
    char* line = (char*) aLine;

    while( (*line != ' ' ) && *line )
        line++;

    if( sscanf( line, "%s %s", Name1, Name2 ) != 2  )
    {
        aErrorMsg.Printf( wxT( "EESchema file segment error at line %d, aborted" ),
                          aLine.LineNumber() );
        aErrorMsg << wxT( "\n" ) << CONV_FROM_UTF8( (char*) aLine );
        return false;
    }

    m_Layer = LAYER_NOTES;

    if( Name1[0] == 'W' )
        m_Layer = LAYER_WIRE;

    if( Name1[0] == 'B' )
        m_Layer = LAYER_BUS;

    if( !aLine.ReadLine() || sscanf( (char*) aLine, "%d %d %d %d ",
                                      &m_Start.x, &m_Start.y, &m_End.x, &m_End.y ) != 4 )
    {
        aErrorMsg.Printf( wxT( "EESchema file Segment struct error at line %d, aborted" ),
                          aLine.LineNumber() );
        aErrorMsg << wxT( "\n" ) << CONV_FROM_UTF8( (char*) aLine );
        return false;
    }

    return true;
}


int SCH_LINE::GetPenSize() const
{
    int pensize = ( m_Width == 0 ) ? g_DrawDefaultLineThickness : m_Width;

    if( m_Layer == LAYER_BUS && m_Width == 0 )
    {
        pensize = wxRound( g_DrawDefaultLineThickness * BUS_WIDTH_EXPAND );
        pensize = MAX( pensize, 3 );
    }

    return pensize;
}


void SCH_LINE::Draw( WinEDA_DrawPanel* panel, wxDC* DC, const wxPoint& offset,
                     int DrawMode, int Color )
{
    int color;
    int width = GetPenSize();

    if( Color >= 0 )
        color = Color;
    else
        color = ReturnLayerColor( m_Layer );

    GRSetDrawMode( DC, DrawMode );

    wxPoint start = m_Start;
    wxPoint end = m_End;

    if( ( m_Flags & STARTPOINT ) == 0 )
        start += offset;
    if( ( m_Flags & ENDPOINT ) == 0 )
        end += offset;

    if( m_Layer == LAYER_NOTES )
        GRDashedLine( &panel->m_ClipBox, DC, start.x, start.y, end.x, end.y, width, color );
    else
        GRLine( &panel->m_ClipBox, DC, start.x, start.y, end.x, end.y, width, color );

    if( m_StartIsDangling )
        DrawDanglingSymbol( panel, DC, m_Start + offset, color );

    if( m_EndIsDangling )
        DrawDanglingSymbol( panel, DC, m_End + offset, color );
}


void SCH_LINE::Mirror_X( int aXaxis_position )
{
    m_Start.y -= aXaxis_position;
    NEGATE(  m_Start.y );
    m_Start.y += aXaxis_position;
    m_End.y   -= aXaxis_position;
    NEGATE(  m_End.y );
    m_End.y += aXaxis_position;
}


void SCH_LINE::Mirror_Y( int aYaxis_position )
{
    m_Start.x -= aYaxis_position;
    NEGATE(  m_Start.x );
    m_Start.x += aYaxis_position;
    m_End.x   -= aYaxis_position;
    NEGATE(  m_End.x );
    m_End.x += aYaxis_position;
}


void SCH_LINE::Rotate( wxPoint rotationPoint )
{
    RotatePoint( &m_Start, rotationPoint, 900 );
    RotatePoint( &m_End, rotationPoint, 900 );
}


bool SCH_LINE::MergeOverlap( SCH_LINE* aLine )
{
    wxCHECK_MSG( aLine != NULL && aLine->Type() == SCH_LINE_T, false,
                 wxT( "Cannot test line segment for overlap." ) );

    if( this == aLine || GetLayer() != aLine->GetLayer() )
        return false;

    // Search for a common end, and modify coordinates to ensure RefSegm->m_End
    // == TstSegm->m_Start
    if( m_Start == aLine->m_Start )
    {
        if( m_End == aLine->m_End )
            return true;

        EXCHG( m_Start, m_End );
    }
    else if( m_Start == aLine->m_End )
    {
        EXCHG( m_Start, m_End );
        EXCHG( aLine->m_Start, aLine->m_End );
    }
    else if( m_End == aLine->m_End )
    {
        EXCHG( aLine->m_Start, aLine->m_End );
    }
    else if( m_End != aLine->m_Start )
    {
        // No common end point, segments cannot be merged.
        return false;
    }

    /* Test alignment: */
    if( m_Start.y == m_End.y )       // Horizontal segment
    {
        if( aLine->m_Start.y == aLine->m_End.y )
        {
            m_End = aLine->m_End;
            return true;
        }
    }
    else if( m_Start.x == m_End.x )  // Vertical segment
    {
        if( aLine->m_Start.x == aLine->m_End.x )
        {
            m_End = aLine->m_End;
            return true;
        }
    }
    else
    {
        if( atan2( (double) ( m_Start.x - m_End.x ), (double) ( m_Start.y - m_End.y ) )
            == atan2( (double) ( aLine->m_Start.x - aLine->m_End.x ),
                      (double) ( aLine->m_Start.y - aLine->m_End.y ) ) )
        {
            m_End = aLine->m_End;
            return true;
        }
    }

    return false;
}


void SCH_LINE::GetEndPoints( std::vector <DANGLING_END_ITEM>& aItemList )
{
    if( GetLayer() == LAYER_NOTES )
        return;

    if( ( GetLayer() == LAYER_BUS ) || ( GetLayer() == LAYER_WIRE ) )
    {
        DANGLING_END_ITEM item( (GetLayer() == LAYER_BUS) ? BUS_START_END : WIRE_START_END, this );
        item.m_Pos = m_Start;
        DANGLING_END_ITEM item1( (GetLayer() == LAYER_BUS) ? BUS_END_END : WIRE_END_END, this );
        item1.m_Pos = m_End;

        aItemList.push_back( item );
        aItemList.push_back( item1 );
    }
}


bool SCH_LINE::IsDanglingStateChanged( std::vector< DANGLING_END_ITEM >& aItemList )
{
    bool previousStartState = m_StartIsDangling;
    bool previousEndState = m_EndIsDangling;

    m_StartIsDangling = m_EndIsDangling = true;

    if( GetLayer() == LAYER_WIRE )
    {
        BOOST_FOREACH( DANGLING_END_ITEM item, aItemList )
        {
            if( item.m_Item == this )
                continue;

            if( m_Start == item.m_Pos )
                m_StartIsDangling = false;

            if( m_End == item.m_Pos )
                m_EndIsDangling = false;

            if( (m_StartIsDangling == false) && (m_EndIsDangling == false) )
                break;
        }
    }
    else if( GetLayer() == LAYER_BUS || GetLayer() == LAYER_NOTES )
    {
        // Lines on the notes layer and the bus layer cannot be tested for dangling ends.
        previousStartState = previousEndState = m_StartIsDangling = m_EndIsDangling = false;
    }

    return ( previousStartState != m_StartIsDangling ) || ( previousEndState != m_EndIsDangling );
}


bool SCH_LINE::IsSelectStateChanged( const wxRect& aRect )
{
    bool previousState = IsSelected();

    if( aRect.Contains( m_Start ) && aRect.Contains( m_End ) )
    {
        m_Flags |= SELECTED;
    }
    else if( aRect.Contains( m_Start ) )
    {
        m_Flags &= ~STARTPOINT;
        m_Flags |= ( SELECTED | ENDPOINT );
    }
    else if( aRect.Contains( m_End ) )
    {
        m_Flags &= ~ENDPOINT;
        m_Flags |= ( SELECTED | STARTPOINT );
    }
    else
    {
        m_Flags &= ~( SELECTED | STARTPOINT | ENDPOINT );
    }

    return previousState != IsSelected();
}


bool SCH_LINE::IsConnectable() const
{
    if( m_Layer == LAYER_WIRE || m_Layer == LAYER_BUS )
        return true;

    return false;
}


void SCH_LINE::GetConnectionPoints( vector< wxPoint >& aPoints ) const
{
    aPoints.push_back( m_Start );
    aPoints.push_back( m_End );
}


bool SCH_LINE::doHitTest( const wxPoint& aPoint, int aAccuracy, SCH_FILTER_T aFilter ) const
{
    if( !( aFilter & ( DRAW_ITEM_T | WIRE_T | BUS_T ) ) )
        return false;

    if( ( ( aFilter & DRAW_ITEM_T ) && ( m_Layer == LAYER_NOTES ) )
        || ( ( aFilter & WIRE_T ) && ( m_Layer == LAYER_WIRE ) )
        || ( ( aFilter & BUS_T ) && ( m_Layer == LAYER_BUS ) ) )
    {
        if( ( aFilter & EXCLUDE_WIRE_BUS_ENDPOINTS && IsEndPoint( aPoint ) )
            || ( aFilter & WIRE_BUS_ENDPOINTS_ONLY && !IsEndPoint( aPoint ) )
            || ( TestSegmentHit( aPoint, m_Start, m_End, aAccuracy ) ) )
            return true;
    }

    return false;
}


bool SCH_LINE::doHitTest( const EDA_Rect& aRect, bool aContained, int aAccuracy ) const
{
    EDA_Rect rect = aRect;

    rect.Inflate( aAccuracy );

    if( aContained )
        return rect.Contains( GetBoundingBox() );

    return rect.Intersects( GetBoundingBox() );
}


bool SCH_LINE::doIsConnected( const wxPoint& aPosition ) const
{
    if( m_Layer != LAYER_WIRE && m_Layer != LAYER_BUS )
        return false;

    return IsEndPoint( aPosition );
}