// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved        *
// **************************************************************************

#include "folder_history_box.h"
#include <list>
#include <wx/scrolwin.h>
#include "../lib/resolve_path.h"
#include <wx+/string_conv.h>

using namespace zen;

namespace
{
const wxEventType wxEVT_VALIDATE_USER_SELECTION = wxNewEventType();
}

FolderHistoryBox::FolderHistoryBox(wxWindow* parent,
                                   wxWindowID id,
                                   const wxString& value,
                                   const wxPoint& pos,
                                   const wxSize& size,
                                   int n,
                                   const wxString choices[],
                                   long style,
                                   const wxValidator& validator,
                                   const wxString& name) :
    wxComboBox(parent, id, value, pos, size, n, choices, style, validator, name)
#if wxCHECK_VERSION(2, 9, 1)
    , dropDownShown(false)
#endif
{
    //#####################################
    /*##*/ SetMinSize(wxSize(150, -1)); //## workaround yet another wxWidgets bug: default minimum size is much too large for a wxComboBox
    //#####################################

    Connect(wxEVT_KEY_DOWN,                      wxKeyEventHandler(FolderHistoryBox::OnKeyEvent  ), nullptr, this);
    Connect(wxEVT_LEFT_DOWN,                        wxEventHandler(FolderHistoryBox::OnUpdateList), nullptr, this);
    Connect(wxEVT_COMMAND_COMBOBOX_SELECTED, wxCommandEventHandler(FolderHistoryBox::OnSelection ), nullptr, this);
    Connect(wxEVT_MOUSEWHEEL,                  wxMouseEventHandler(FolderHistoryBox::OnMouseWheel), nullptr, this);

#if wxCHECK_VERSION(2, 9, 1)
    Connect(wxEVT_COMMAND_COMBOBOX_DROPDOWN, wxCommandEventHandler(FolderHistoryBox::OnShowDropDown), nullptr, this);
    Connect(wxEVT_COMMAND_COMBOBOX_CLOSEUP, wxCommandEventHandler(FolderHistoryBox::OnHideDropDown), nullptr, this);
#endif

    Connect(wxEVT_VALIDATE_USER_SELECTION, wxCommandEventHandler(FolderHistoryBox::OnValidateSelection), nullptr, this);
}


#if wxCHECK_VERSION(2, 9, 1)
void FolderHistoryBox::OnShowDropDown(wxCommandEvent& event)
{
    dropDownShown = true;
    event.Skip();
}


void FolderHistoryBox::OnHideDropDown(wxCommandEvent& event)
{
    dropDownShown = false;
    event.Skip();
}
#endif

//set value and update list are technically entangled: see potential bug description below
void FolderHistoryBox::setValueAndUpdateList(const wxString& dirname)
{
    //it may be a little lame to update the list on each mouse-button click, but it should be working and we dont't have to manipulate wxComboBox internals

    std::list<Zstring> dirList;

    //add some aliases to allow user changing to volume name and back, if possible
#ifdef FFS_WIN
    std::vector<Zstring> aliases = getDirectoryAliases(toZ(dirname));
    dirList.insert(dirList.end(), aliases.begin(), aliases.end());
#endif

    if (sharedHistory_.get())
    {
        auto tmp = sharedHistory_->getList();
        //std::sort(tmp.begin(), tmp.end(), LessFilename());

        if (!dirList.empty() && !tmp.empty())
            dirList.push_back(toZ(FolderHistory::separationLine()));

        dirList.insert(dirList.end(), tmp.begin(), tmp.end());
    }
    //###########################################################################################

    //attention: if the target value is not part of the dropdown list, SetValue() will look for a string that *starts with* this value:
    //e.g. if the dropdown list contains "222" SetValue("22") will erroneously set and select "222" instead, while "111" would be set correctly!
    // -> by design on Windows!
    if (std::find(dirList.begin(), dirList.end(), toZ(dirname)) == dirList.end())
        dirList.push_front(toZ(dirname));

    Clear();
    std::for_each(dirList.begin(), dirList.end(), [&](const Zstring& dir) { this->Append(toWx(dir)); });
    //this->SetSelection(wxNOT_FOUND); //don't select anything
    this->SetValue(dirname);          //preserve main text!
}


void FolderHistoryBox::OnSelection(wxCommandEvent& event)
{
    wxCommandEvent dummy2(wxEVT_VALIDATE_USER_SELECTION); //we cannot replace built-in commands at this position in call stack, so defer to a later time!
    if (auto handler = GetEventHandler())
        handler->AddPendingEvent(dummy2);

    event.Skip();
}


void FolderHistoryBox::OnValidateSelection(wxCommandEvent& event)
{
    //const auto& value = GetValue();
    //if (value == FolderHistory::separationLine())
    //    setValueAndUpdateList(wxString()); -> not good enough (resolved folder name not updated)
}


void FolderHistoryBox::OnKeyEvent(wxKeyEvent& event)
{
    const int keyCode = event.GetKeyCode();
    if (keyCode == WXK_DELETE || keyCode == WXK_NUMPAD_DELETE)
    {
        //try to delete the currently selected config history item
        int pos = this->GetCurrentSelection();
        if (0 <= pos && pos < static_cast<int>(this->GetCount()) &&
#if wxCHECK_VERSION(2, 9, 1)
            dropDownShown)
#else
            //what a mess...:
            (GetValue() != GetString(pos) || //avoid problems when a character shall be deleted instead of list item
             GetValue() == wxEmptyString)) //exception: always allow removing empty entry
#endif
        {
            //save old (selected) value: deletion seems to have influence on this
            const wxString currentVal = this->GetValue();
            //this->SetSelection(wxNOT_FOUND);

            //delete selected row
            if (sharedHistory_.get())
                sharedHistory_->delItem(toZ(GetString(pos)));
            SetString(pos, wxString()); //in contrast to Delete(), this one does not kill the drop-down list and gives a nice visual feedback!
            //Delete(pos);

            //(re-)set value
            this->SetValue(currentVal);

            //eat up key event
            return;
        }
    }
    event.Skip();
}


void FolderHistoryBox::OnMouseWheel(wxMouseEvent& event)
{
    //although switching to available items is wxWidgets default, this is NOT windows default, e.g. explorer
    //additionally this will delete manual entries, although all the users wanted is scroll the parent window!

    //redirect to parent scrolled window!
    wxWindow* wnd = this;
    while ((wnd = wnd->GetParent()) != nullptr) //silence MSVC warning
        if (dynamic_cast<wxScrolledWindow*>(wnd) != nullptr)
            if (wxEvtHandler* evtHandler = wnd->GetEventHandler())
            {
                evtHandler->AddPendingEvent(event);
                break;
            }

    //	event.Skip();
}