/*
* This file is part of wxSmith plugin for Code::Blocks Studio
* Copyright (C) 2006-2007  Bartlomiej Swiecki
*
* wxSmith 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 3 of the License, or
* (at your option) any later version.
*
* wxSmith 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 wxSmith. If not, see <http://www.gnu.org/licenses/>.
*
* $Revision: 12197 $
* $Id: wxseventseditor.cpp 12197 2020-08-11 08:14:14Z fuscated $
* $HeadURL: https://svn.code.sf.net/p/codeblocks/code/trunk/src/plugins/contrib/wxSmith/wxwidgets/wxseventseditor.cpp $
*/

#include "wxseventseditor.h"
#include "wxsitem.h"
#include "wxsitemresdata.h"
#include "../wxscoder.h"

#include <editormanager.h>
#include "cbstyledtextctrl.h"

namespace
{
    const wxString NoneStr   = _("-- None --");
    const wxString AddNewStr = _("-- Add new handler --");
}

wxsEventsEditor::wxsEventsEditor():
    m_Item(0),
    m_Events(0),
    m_Source(),
    m_Header(),
    m_Class(),
    m_Ids()
{
}

wxsEventsEditor::~wxsEventsEditor()
{
    m_Item = 0;
    m_Events = 0;
    m_Ids.Clear();
}

wxsEventsEditor& wxsEventsEditor::Get()
{
    static wxsEventsEditor Singleton;
    return Singleton;
}

void wxsEventsEditor::BuildEvents(wxsItem* Item,wxsPropertyGridManager* Grid)
{
    m_Item = Item;
    m_Data = 0;
    m_Events = 0;
    m_Ids.Clear();
    m_Source.Clear();
    m_Header.Clear();
    m_Class.Clear();

    int PageIndex = 1;              // TODO: Do not use fixed page number
    Grid->ClearPage(PageIndex);
    Grid->SelectPage(PageIndex);

    if ( !m_Item )
    {
        return;
    }

    m_Events = &m_Item->GetEvents();
    m_Data   = m_Item->GetResourceData();
    m_Source = m_Data->GetSrcFileName();
    m_Header = m_Data->GetHdrFileName();
    m_Class  = m_Data->GetClassName();
    m_Language = m_Data->GetLanguage();

    int Cnt = m_Events->GetCount();
    for ( int i=0; i<Cnt; i++ )
    {
        const wxsEventDesc* Event = m_Events->GetDesc(i);
        const wxString& FunctionName = m_Events->GetHandler(i);

        // TODO: Create new group
        if ( Event->ET == wxsEventDesc::Category )
        {
            m_Ids.Add(0);
            continue;
        }

        wxArrayString Functions;
        FindFunctions(Event->ArgType,Functions);

        wxPGChoices Const;
        Const.Add(NoneStr,0);
        Const.Add(AddNewStr,1);

        int Index = 0;
        for ( int j=0; j<(int)Functions.Count(); j++ )
        {
            Const.Add(Functions[j],j+2);
            if ( Functions[j] == FunctionName )
            {
                Index = j+2;
            }
        }
        if ( Index == 0 )
        {
            m_Events->SetHandler(i,_T(""));
        }

        m_Ids.Add(Grid->Append(new wxEnumProperty(Event->Entry,wxPG_LABEL,Const,Index)));
    }

    Grid->SelectPage(0);
}

void wxsEventsEditor::PGChanged(wxsItem* Item,wxsPropertyGridManager* Grid,wxPGId Id)
{
    // Just small check to avoid some invalid updates
    if ( Item != m_Item )
    {
        return;
    }

    int Index;
    for ( Index=0; Index<(int)m_Ids.Count(); Index++ )
    {
        if ( m_Ids[Index] == Id ) break;
    }

    if ( Index>=(int)m_Ids.Count() )
    {
        return;
    }

    wxString Selection = Grid->GetPropertyValueAsString(Id);
    wxString usedHandlerName = m_Events->GetHandler(Index);

    // jump action should have both the conditions
    // 1, the event sink already have a real function name associated
    // 2, the current selected name is the same as the sink name
    if (   ( !usedHandlerName.IsEmpty() )
        && usedHandlerName.IsSameAs(Selection) )
    {
        // which means this event is emulated from the double click on the event ID name,
        // user want to jump to the implementation of this event handler function body,
        // no need to rebuild the event and notify other part
        GotoHandler(Index);
        return;
    }
    else if (  usedHandlerName.IsEmpty()
             && Selection.IsSameAs(NoneStr) )
    {
        // special case here(cause by the emulate of OnChange when user double click on the event
        // name, nothing should be done in this case.
        return;
    }

    if ( Selection == NoneStr )
    {
        m_Events->SetHandler(Index,_T(""));
    }
    else if ( Selection == AddNewStr )
    {
        m_Events->SetHandler(Index,GetNewFunction(m_Events->GetDesc(Index)));
        BuildEvents(m_Item,Grid);
    }
    else
    {
        m_Events->SetHandler(Index,Selection);
        GotoHandler(Index);
    }

    m_Data->NotifyChange(m_Item);
}

bool wxsEventsEditor::GotoOrBuildEvent(wxsItem* Item,int EventIndex,wxsPropertyGridManager* Grid)
{
    if ( Item != m_Item ) return false; // Can do this only to currently edited item
    if ( EventIndex < 0 ) return false;
    if ( EventIndex >= m_Events->GetCount() ) return false;

    if ( m_Events->GetHandler(EventIndex).IsEmpty() )
    {
        // Adding new event handler
        wxString NewFunctionName = GetFunctionProposition(m_Events->GetDesc(EventIndex));
        if ( CreateNewFunction(m_Events->GetDesc(EventIndex),NewFunctionName) )
        {
            m_Events->SetHandler(EventIndex,NewFunctionName);
            BuildEvents(Item,Grid);
            m_Data->NotifyChange(m_Item);
            return true;
        }
        return false;
    }
    else
    {
        GotoHandler(EventIndex);
        return false;
    }
}

void wxsEventsEditor::FindFunctions(const wxString& ArgType,wxArrayString& Array)
{
    wxString Code = wxsCoder::Get()->GetCode(m_Header,
        wxsCodeMarks::Beg(m_Language,_T("Handlers"),m_Class),
        wxsCodeMarks::End(m_Language),
        false,false);

    switch ( m_Language )
    {
        case wxsCPP:
        {
            // Basic parsing

            for(;;)
            {
                // Searching for void statement - it may begin new fuunction declaration

                int Pos = Code.Find(_T("void"));
                if ( Pos == -1 ) break;

                // Removing all before function name
                Code.Remove(0,Pos+4).Trim(false);

                // Getting function name
                Pos  = 0;
                while ( (int)Code.Length() > Pos )
                {
                    wxChar First = Code.GetChar(Pos);
                    if ( ( First<_T('A') || First>_T('Z') ) &&
                         ( First<_T('a') || First>_T('z') ) &&
                         ( First<_T('0') || First>_T('9') ) &&
                         ( First!=_T('_') ) )
                    {
                        break;
                    }
                    Pos++;
                }
                wxString NewFunctionName = Code.Mid(0,Pos);
                Code.Remove(0,Pos).Trim(false);
                if ( !Code.Length() ) break;

                // Parsing arguments
                if ( Code.GetChar(0) != _T('(') ) continue;
                Code.Remove(0,1).Trim(false);
                if ( !Code.Length() ) break;

                // Getting argument type
                Pos  = 0;
                while ( (int)Code.Length() > Pos )
                {
                    wxChar First = Code.GetChar(Pos);
                    if ( ( First<_T('A') || First>_T('Z') ) &&
                         ( First<_T('a') || First>_T('z') ) &&
                         ( First<_T('0') || First>_T('9') ) &&
                         ( First!=_T('_') ) )
                    {
                        break;
                    }
                    Pos++;
                }
                wxString NewEventType = Code.Mid(0,Pos);
                Code.Remove(0,Pos).Trim(false);
                if ( !Code.Length() ) break;

                // Checking if the rest of declaratin is valid
                if ( Code.GetChar(0) != _T('&') ) continue;
                Code.Remove(0,1).Trim(false);
                if ( !Code.Length() ) break;

                // Skipping argument name
                Pos  = 0;
                while ( (int)Code.Length() > Pos )
                {
                    wxChar First = Code.GetChar(Pos);
                    if ( ( First<_T('A') || First>_T('Z') ) &&
                         ( First<_T('a') || First>_T('z') ) &&
                         ( First<_T('0') || First>_T('9') ) &&
                         ( First!=_T('_') ) )
                    {
                        break;
                    }
                    Pos++;
                }
                Code.Remove(0,Pos).Trim(false);
                if ( !Code.Length() ) break;

                if ( Code.GetChar(0) != _T(')') ) continue;
                Code.Remove(0,1).Trim(false);
                if ( !Code.Length() ) break;

                if ( Code.GetChar(0) != _T(';') ) continue;
                Code.Remove(0,1).Trim(false);

                if ( NewFunctionName.Length() == 0 || NewEventType.Length() == 0 ) continue;

                // We got new function, checking event type and adding to array

                if ( !ArgType.Length() || ArgType == NewEventType )
                {
                    Array.Add(NewFunctionName);
                }
            }
            break;
        }

        case wxsUnknownLanguage: // fall-through
        default:
        {
            wxsCodeMarks::Unknown(_T("wxsEventsEditor::FindFunctions"),m_Language);
        }
    }

}

wxString wxsEventsEditor::GetFunctionProposition(const wxsEventDesc* Event)
{
    // Creating proposition of new function name
    wxString NewNameBase;
    wxString VarName = m_Item->IsRootItem() ? _T("") : m_Item->GetVarName();
    if (Manager::Get()->GetConfigManager(_T("wxsmith"))->ReadBool(_T("/removeprefix"), false))
    {
        if (VarName.StartsWith(_T("m_")))
            VarName = VarName.Right(VarName.Len() - 2);
        else if (VarName.StartsWith(_T("_")))
            VarName = VarName.Right(VarName.Len() - 1);
    }

    NewNameBase.Printf(_T("On%s%s"),VarName.c_str(),Event->NewFuncNameBase.c_str());

    int Suffix = 0;
    wxArrayString Functions;
    FindFunctions(_T(""),Functions);
    wxString NewName = NewNameBase;

    while ( Functions.Index(NewName) != wxNOT_FOUND )
    {
        NewName = NewNameBase;
        NewName.Append(wxString::Format(_T("%d"),++Suffix));
    }

    return NewName;
}

wxString wxsEventsEditor::GetNewFunction(const wxsEventDesc* Event)
{
    wxString Name = GetFunctionProposition(Event);

    for (;;)
    {
        Name = ::cbGetTextFromUser(_("Enter name for new handler:"),_("New handler"),Name);
        if ( !Name.Length() ) return _T("");

        if ( !wxsCodeMarks::ValidateIdentifier(m_Language,Name) )
        {
            wxMessageBox(_("Invalid name"));
            continue;
        }

        wxArrayString Functions;
        FindFunctions(_T(""),Functions);

        if ( Functions.Index(Name) != wxNOT_FOUND )
        {
            wxMessageBox(_("Handler with this name already exists"));
            continue;
        }

        break;
    }

    // Creating new function

    if ( !CreateNewFunction(Event,Name) )
    {
        wxMessageBox(_("Couldn't add new handler"));
        return _T("");
    }

    return Name;
}

bool wxsEventsEditor::CreateNewFunction(const wxsEventDesc* Event,const wxString& NewFunctionName)
{
    switch ( m_Language )
    {
        case wxsCPP:
        {
            wxString Declarations = wxsCoder::Get()->GetCode(
                m_Header,
                wxsCodeMarks::Beg(wxsCPP,_T("Handlers"),m_Class),
                wxsCodeMarks::End(wxsCPP),
                false,false);

            if ( Declarations.Length() == 0 )
            {
                return false;
            }

            Declarations << _T("void ") << NewFunctionName << _T('(');
            Declarations << Event->ArgType << _T("& event);\n");

            wxsCoder::Get()->AddCode(
                m_Header,
                wxsCodeMarks::Beg(wxsCPP,_T("Handlers"),m_Class),
                wxsCodeMarks::End(wxsCPP),
                Declarations,
                true, false, false);

            cbEditor* Editor = Manager::Get()->GetEditorManager()->Open(m_Source);
            if ( !Editor )
            {
                return false;
            }

            wxString NewFunctionCode;
            NewFunctionCode <<
                _T("\n")
                _T("void ") << m_Class << _T("::") << NewFunctionName << _T("(") << Event->ArgType << _T("& event)\n")
                _T("{\n")
                _T("}\n");

            // TODO: Replace line endings with propert string

            cbStyledTextCtrl* Ctrl = Editor->GetControl();
            int LineNumber = Ctrl->GetLineCount();
            Ctrl->DocumentEnd();
            Ctrl->AddText(NewFunctionCode);
            Editor->SetModified();
            Editor->Activate();
            Editor->GotoLine(LineNumber+2);
            Ctrl->LineEnd();
            return true;
        }

        case wxsUnknownLanguage: // fall-through
        default:
        {
            wxsCodeMarks::Unknown(_T("wxsEventsEditor::CreateNewFunction"),m_Language);
        }
    }
    return true;
}

bool wxsEventsEditor::GotoHandler(int Index)
{
    cbEditor* Editor = Manager::Get()->GetEditorManager()->Open(m_Source);
    if ( !Editor )
    {
        return false;
    }

    wxString FunctionName = m_Events->GetHandler(Index);
    if ( FunctionName.IsEmpty() )
    {
        return false;
    }

    cbStyledTextCtrl* Ctrl = Editor->GetControl();
    wxString FullText = Ctrl->GetText();
    int Begin = 0;
    int End = Ctrl->GetLength();
    while ( Begin < End )
    {
        int Pos = Ctrl->FindText(Begin,End,FunctionName,wxSCI_FIND_MATCHCASE);
        if ( Pos < 0 ) break;

        // Checking if there's <ClassName> :: sequence before function

        int Before = Pos;
        while ( --Before >= 0 )
        {
            wxChar Ch = Ctrl->GetCharAt(Before);
            if ( Ch!=' ' && Ch!='\t' && Ch!='\r' && Ch!='\n' ) break;
        }
        if ( Before >= 1 )
        {
            if ( Ctrl->GetCharAt(Before) == ':' && Ctrl->GetCharAt(Before-1) == ':' )
            {
                Before--;
                while ( --Before >= 0 )
                {
                    wxChar Ch = Ctrl->GetCharAt(Before);
                    if ( Ch!=' ' && Ch!='\t' && Ch!='\r' && Ch!='\n' ) break;
                }
                if ( Before > 0 )
                {
                    wxString ClassName;
                    while ( Before>=0 )
                    {
                        wxChar Ch = Ctrl->GetCharAt(Before--);
                        if ( (Ch<'a' || Ch>'z') && (Ch<'A' || Ch>'Z') && (Ch<'0' || Ch>'9') && (Ch!='_') ) break;
                        ClassName = Ch + ClassName;
                    }

                    if ( ClassName == m_Class )
                    {
                        // Test if there's ( after function name
                        int After = Pos + FunctionName.Length();
                        while ( After < End )
                        {
                            wxChar Ch = Ctrl->GetCharAt(After);
                            if ( Ch!=' ' && Ch!='\t' && Ch!='\r' && Ch!='\n' ) break;
                            After++;
                        }
                        if ( After < End )
                        {
                            if ( Ctrl->GetCharAt(After) == '(' )
                            {
                                Editor->GotoLine(Ctrl->LineFromPosition(Pos));
                                return true;
                            }
                        }
                    }
                }
            }
        }

        Begin = Pos + FunctionName.Length();

    }
    return false;
}
