/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
 * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 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.cpp
 * @brief SCH_SHEET_PATH class implementation.
 */

#include <fctsys.h>

#include <general.h>
#include <dlist.h>
#include <class_sch_screen.h>
#include <sch_item_struct.h>

#include <sch_reference_list.h>
#include <class_library.h>
#include <sch_sheet.h>
#include <sch_sheet_path.h>
#include <sch_component.h>
#include <template_fieldnames.h>

#include <dialogs/dialog_schematic_find.h>

#include <boost/foreach.hpp>
#include <wx/filename.h>


SCH_SHEET_PATH::SCH_SHEET_PATH()
{
    for( int i = 0; i<DSLSZ; i++ )
        m_sheets[i] = NULL;

    m_numSheets = 0;
}


bool SCH_SHEET_PATH::BuildSheetPathInfoFromSheetPathValue( const wxString& aPath, bool aFound )
{
    if( aFound )
        return true;

    if( GetCount() == 0 )
        Push( g_RootSheet );

    if( aPath == Path() )
        return true;

    SCH_ITEM* schitem = LastDrawList();

    while( schitem && GetCount() < NB_MAX_SHEET )
    {
        if( schitem->Type() == SCH_SHEET_T )
        {
            SCH_SHEET* sheet = (SCH_SHEET*) schitem;
            Push( sheet );

            if( aPath == Path() )
                return true;

            if( BuildSheetPathInfoFromSheetPathValue( aPath ) )
                return true;

            Pop();
        }

        schitem = schitem->Next();
    }

    return false;
}


int SCH_SHEET_PATH::Cmp( const SCH_SHEET_PATH& aSheetPathToTest ) const
{
    if( m_numSheets > aSheetPathToTest.m_numSheets )
        return 1;

    if( m_numSheets < aSheetPathToTest.m_numSheets )
        return -1;

    //otherwise, same number of sheets.
    for( unsigned i = 0; i<m_numSheets; i++ )
    {
        if( m_sheets[i]->GetTimeStamp() > aSheetPathToTest.m_sheets[i]->GetTimeStamp() )
            return 1;

        if( m_sheets[i]->GetTimeStamp() < aSheetPathToTest.m_sheets[i]->GetTimeStamp() )
            return -1;
    }

    return 0;
}


SCH_SHEET* SCH_SHEET_PATH::Last() const
{
    if( m_numSheets )
        return m_sheets[m_numSheets - 1];

    return NULL;
}


SCH_SCREEN* SCH_SHEET_PATH::LastScreen() const
{
    SCH_SHEET* lastSheet = Last();

    if( lastSheet )
        return lastSheet->GetScreen();

    return NULL;
}


SCH_ITEM* SCH_SHEET_PATH::LastDrawList() const
{
    SCH_SHEET* lastSheet = Last();

    if( lastSheet && lastSheet->GetScreen() )
        return lastSheet->GetScreen()->GetDrawItems();

    return NULL;
}


SCH_ITEM* SCH_SHEET_PATH::FirstDrawList() const
{
    SCH_ITEM* item = NULL;

    if( m_numSheets && m_sheets[0]->GetScreen() )
        item = m_sheets[0]->GetScreen()->GetDrawItems();

    /* @fixme - These lists really should be one of the boost pointer containers.  This
     *          is a brain dead hack to allow reverse iteration of EDA_ITEM linked
     *          list.
     */
    SCH_ITEM* lastItem = NULL;

    while( item )
    {
        lastItem = item;
        item = item->Next();
    }

    return lastItem;
}


void SCH_SHEET_PATH::Push( SCH_SHEET* aSheet )
{
    wxCHECK_RET( m_numSheets < DSLSZ,
                 wxString::Format( _( "Schematic sheets can only be nested %d levels deep." ),
                                   DSLSZ ) );

    m_sheets[ m_numSheets ] = aSheet;
    m_numSheets++;
}


SCH_SHEET* SCH_SHEET_PATH::Pop()
{
    if( m_numSheets > 0 )
    {
        m_numSheets--;
        return m_sheets[m_numSheets];
    }

    return NULL;
}


wxString SCH_SHEET_PATH::Path() const
{
    wxString s, t;

    s = wxT( "/" );     // This is the root path

    // start at 1 to avoid the root sheet,
    // which does not need to be added to the path
    // it's timestamp changes anyway.
    for( unsigned i = 1; i < m_numSheets; i++ )
    {
        t.Printf( _( "%8.8lX/" ), (long unsigned) m_sheets[i]->GetTimeStamp() );
        s = s + t;
    }

    return s;
}


wxString SCH_SHEET_PATH::PathHumanReadable() const
{
    wxString s;

    s = wxT( "/" );

    // start at 1 to avoid the root sheet, as above.
    for( unsigned i = 1; i< m_numSheets; i++ )
    {
        s = s + m_sheets[i]->GetName() + wxT( "/" );
    }

    return s;
}


SCH_ITEM* SCH_SHEET_PATH::FindPreviousItem( KICAD_T aType, SCH_ITEM* aLastItem, bool aWrap ) const
{
    bool hasWrapped = false;
    bool firstItemFound = false;
    SCH_ITEM* drawItem = FirstDrawList();

    while( drawItem )
    {
        if( drawItem->Type() == aType )
        {
            if( aLastItem == NULL || firstItemFound )
            {
                return drawItem;
            }
            else if( !firstItemFound && drawItem == aLastItem )
            {
                firstItemFound = true;
            }
        }

        drawItem = drawItem->Back();

        if( drawItem == NULL && aLastItem && aWrap && !hasWrapped )
        {
            hasWrapped = true;
            drawItem = FirstDrawList();
        }
    }

    return NULL;
}


SCH_SHEET_PATH& SCH_SHEET_PATH::operator=( const SCH_SHEET_PATH& d1 )
{
    if( this == &d1 )     // Self assignment is bad!
        return *this;

    m_numSheets = d1.m_numSheets;

    unsigned i;

    for( i = 0; i < m_numSheets; i++ )
        m_sheets[i] = d1.m_sheets[i];

    for( ; i < DSLSZ; i++ )
        m_sheets[i] = 0;

    return *this;
}


bool SCH_SHEET_PATH::operator==( const SCH_SHEET_PATH& d1 ) const
{
    if( m_numSheets != d1.m_numSheets )
        return false;

    for( unsigned i = 0; i < m_numSheets; i++ )
    {
        if( m_sheets[i] != d1.m_sheets[i] )
            return false;
    }

    return true;
}


bool SCH_SHEET_PATH::TestForRecursion( const wxString& aSrcFileName,
                                       const wxString& aDestFileName ) const
{
    wxFileName rootFn = g_RootSheet->GetFileName();
    wxFileName srcFn = aSrcFileName;
    wxFileName destFn = aDestFileName;

    if( srcFn.IsRelative() )
        srcFn.MakeAbsolute( rootFn.GetPath() );

    if( destFn.IsRelative() )
        destFn.MakeAbsolute( rootFn.GetPath() );


    // The source and destination sheet file names cannot be the same.
    if( srcFn == destFn )
        return true;

    /// @todo Store sheet file names with full path, either relative to project path
    ///       or absolute path.  The current design always assumes subsheet files are
    ///       located in the project folder which may or may not be desirable.
    unsigned i = 0;

    while( i < m_numSheets )
    {
        wxFileName cmpFn = m_sheets[i]->GetFileName();

        if( cmpFn.IsRelative() )
            cmpFn.MakeAbsolute( rootFn.GetPath() );

        // Test if the file name of the destination sheet is in anywhere in this sheet path.
        if( cmpFn == destFn )
            break;

        i++;
    }

    // The destination sheet file name was not found in the sheet path or the destination
    // sheet file name is the root sheet so no recursion is possible.
    if( i >= m_numSheets || i == 0 )
        return false;

    // Walk back up to the root sheet to see if the source file name is already a parent in
    // the sheet path.  If so, recursion will occur.
    do
    {
        i -= 1;

        wxFileName cmpFn = m_sheets[i]->GetFileName();

        if( cmpFn.IsRelative() )
            cmpFn.MakeAbsolute( rootFn.GetPath() );

        if( cmpFn == srcFn )
            return true;

    } while( i != 0 );

    // The source sheet file name is not a parent of the destination sheet file name.
    return false;
}


int SCH_SHEET_PATH::FindSheet( const wxString& aFileName ) const
{
    for( unsigned i = 0; i < m_numSheets; i++ )
    {
        if( m_sheets[i]->GetFileName().CmpNoCase( aFileName ) == 0 )
            return (int)i;
    }

    return SHEET_NOT_FOUND;
}


SCH_SHEET* SCH_SHEET_PATH::FindSheetByName( const wxString& aSheetName )
{
    for( unsigned i = 0; i < m_numSheets; i++ )
    {
        if( m_sheets[i]->GetName().CmpNoCase( aSheetName ) == 0 )
            return m_sheets[i];
    }

    return NULL;
}


/********************************************************************/
/* Class SCH_SHEET_LIST to handle the list of Sheets in a hierarchy */
/********************************************************************/
SCH_SHEET_LIST::SCH_SHEET_LIST( SCH_SHEET* aSheet )
{
    m_index = 0;
    m_count = 0;
    m_list  = NULL;
    m_isRootSheet = false;

    if( aSheet == NULL )
        aSheet = g_RootSheet;

    BuildSheetList( aSheet );
}


SCH_SHEET_PATH* SCH_SHEET_LIST::GetFirst()
{
    m_index = 0;

    if( GetCount() > 0 )
        return &( m_list[0] );

    return NULL;
}


SCH_SHEET_PATH* SCH_SHEET_LIST::GetNext()
{
    if( m_index < GetCount() )
        m_index++;

    return GetSheet( m_index );
}


SCH_SHEET_PATH* SCH_SHEET_LIST::GetLast()
{
    if( GetCount() == 0 )
        return NULL;

    m_index = GetCount() - 1;

    return GetSheet( m_index );
}


SCH_SHEET_PATH* SCH_SHEET_LIST::GetPrevious()
{
    if( m_index == 0 )
        return NULL;

    m_index -= 1;

    return GetSheet( m_index );
}


SCH_SHEET_PATH* SCH_SHEET_LIST::GetSheet( int aIndex ) const
{
    if( aIndex < GetCount() )
        return &( m_list[aIndex] );

    return NULL;
}


SCH_SHEET_PATH* SCH_SHEET_LIST::GetSheetByPath( const wxString aPath, bool aHumanReadable )
{
    SCH_SHEET_PATH* sheet = GetFirst();
    wxString sheetPath;

    while( sheet )
    {
        sheetPath = ( aHumanReadable ) ? sheet->PathHumanReadable() : sheet->Path();

        if( sheetPath == aPath )
            return sheet;

        sheet = GetNext();
    }

    return NULL;
}


void SCH_SHEET_LIST::BuildSheetList( SCH_SHEET* aSheet )
{
    wxCHECK_RET( aSheet != NULL, wxT( "Cannot build sheet list from undefined sheet." ) );

    if( aSheet == g_RootSheet )
        m_isRootSheet = true;

    if( m_list == NULL )
    {
        int count = aSheet->CountSheets();

        m_count = count;
        m_index = 0;
        m_list = new SCH_SHEET_PATH[ count ];
        m_currList.Clear();
    }

    m_currList.Push( aSheet );
    m_list[m_index] = m_currList;
    m_index++;

    if( aSheet->GetScreen() )
    {
        EDA_ITEM* strct = m_currList.LastDrawList();

        while( strct )
        {
            if( strct->Type() == SCH_SHEET_T )
            {
                SCH_SHEET* sheet = (SCH_SHEET*) strct;
                BuildSheetList( sheet );
            }

            strct = strct->Next();
        }
    }

    m_currList.Pop();
}


SCH_ITEM* SCH_SHEET_LIST::FindNextItem( KICAD_T aType, SCH_SHEET_PATH** aSheetFoundIn,
                                        SCH_ITEM* aLastItem, bool aWrap )
{
    bool hasWrapped = false;
    bool firstItemFound = false;

    SCH_ITEM*       drawItem = NULL;
    SCH_SHEET_PATH* sheet = GetFirst();

    while( sheet )
    {
        drawItem = sheet->LastDrawList();

        while( drawItem )
        {
            if( drawItem->Type() == aType )
            {
                if( aLastItem == NULL || firstItemFound )
                {
                    if( aSheetFoundIn )
                        *aSheetFoundIn = sheet;

                    return drawItem;
                }
                else if( !firstItemFound && drawItem == aLastItem )
                {
                    firstItemFound = true;
                }
            }

            drawItem = drawItem->Next();
        }

        sheet = GetNext();

        if( sheet == NULL && aLastItem && aWrap && !hasWrapped )
        {
            hasWrapped = true;
            sheet = GetFirst();
        }
    }

    return NULL;
}


SCH_ITEM* SCH_SHEET_LIST::FindPreviousItem( KICAD_T aType, SCH_SHEET_PATH** aSheetFoundIn,
                                            SCH_ITEM* aLastItem, bool aWrap )
{
    bool hasWrapped = false;
    bool firstItemFound = false;
    SCH_ITEM* drawItem = NULL;
    SCH_SHEET_PATH* sheet = GetLast();

    while( sheet )
    {
        drawItem = sheet->FirstDrawList();

        while( drawItem )
        {
            if( drawItem->Type() == aType )
            {
                if( aLastItem == NULL || firstItemFound )
                {
                    if( aSheetFoundIn )
                        *aSheetFoundIn = sheet;

                    return drawItem;
                }
                else if( !firstItemFound && drawItem == aLastItem )
                {
                    firstItemFound = true;
                }
            }

            drawItem = drawItem->Back();
        }

        sheet = GetPrevious();

        if( sheet == NULL && aLastItem && aWrap && !hasWrapped )
        {
            hasWrapped = true;
            sheet = GetLast();
        }
    }

    return NULL;
}


bool SCH_SHEET_LIST::TestForRecursion( const SCH_SHEET_LIST& aSrcSheetHierarchy,
                                       const wxString& aDestFileName ) const
{
    wxFileName rootFn = g_RootSheet->GetFileName();
    wxFileName destFn = aDestFileName;

    if( destFn.IsRelative() )
        destFn.MakeAbsolute( rootFn.GetPath() );

    // Test each SCH_SHEET_PATH in this SCH_SHEET_LIST for potential recursion.
    for( int i = 0; i < m_count; i++ )
    {
        // Test each SCH_SHEET_PATH in the source sheet.
        for( int j = 0; j < aSrcSheetHierarchy.GetCount(); j++ )
        {
            SCH_SHEET_PATH* sheetPath = aSrcSheetHierarchy.GetSheet( j );

            for( unsigned k = 0; k < sheetPath->GetCount(); k++ )
            {
                if( m_list[i].TestForRecursion( sheetPath->GetSheet( k )->GetFileName(),
                                                aDestFileName ) )
                    return true;
            }
        }
    }

    // The source sheet file can safely be added to the destination sheet file.
    return false;
}


SCH_SHEET* SCH_SHEET_LIST::FindSheetByName( const wxString& aSheetName )
{
    for( int i = 0; i < m_count; i++ )
    {
        SCH_SHEET* sheet = m_list[i].FindSheetByName( aSheetName );

        if( sheet )
            return sheet;
    }

    return NULL;
}