// **************************************************************************
// * 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) 2008-2010 ZenJu (zhnmju123 AT gmx.de)                    *
// **************************************************************************
//
#include "drag_n_drop.h"
#include <wx/dnd.h>
#include <wx/window.h>
#include <wx/combobox.h>
#include <wx/textctrl.h>
#include <wx/filepicker.h>
#include <wx/filename.h>
#include "file_handling.h"
#include "string_conv.h"
#include "check_exist.h"


//define new event type
const wxEventType FFS_DROP_FILE_EVENT = wxNewEventType();

typedef void (wxEvtHandler::*FFSFileDropEventFunction)(FFSFileDropEvent&);

#define FFSFileDropEventHandler(func) \
    (wxObjectEventFunction)(wxEventFunction)wxStaticCastEvent(FFSFileDropEventFunction, &func)

class FFSFileDropEvent : public wxCommandEvent
{
public:
    FFSFileDropEvent(const std::vector<wxString>& filesDropped, const wxWindow* dropWindow) :
        wxCommandEvent(FFS_DROP_FILE_EVENT),
        filesDropped_(filesDropped),
        dropWindow_(dropWindow) {}

    virtual wxEvent* Clone() const
    {
        return new FFSFileDropEvent(filesDropped_, dropWindow_);
    }

    const std::vector<wxString> filesDropped_;
    const wxWindow* dropWindow_;
};

//##############################################################################################################


class WindowDropTarget : public wxFileDropTarget
{
public:
    WindowDropTarget(wxWindow* dropWindow) :
        dropWindow_(dropWindow) {}

    virtual bool OnDropFiles(wxCoord x, wxCoord y, const wxArrayString& fileArray)
    {
        std::vector<wxString> filenames;
        for (size_t i = 0; i < fileArray.GetCount(); ++i)
            filenames.push_back(fileArray[i]);

        if (!filenames.empty())
        {
            //create a custom event on drop window: execute event after file dropping is completed! (e.g. after mouse is released)
            FFSFileDropEvent evt(filenames, dropWindow_);
            dropWindow_->GetEventHandler()->AddPendingEvent(evt);
        }
        return false;
    }

private:
    wxWindow* dropWindow_;
};



//##############################################################################################################

using ffs3::DragDropOnMainDlg;

DragDropOnMainDlg::DragDropOnMainDlg(wxWindow*        dropWindow1,
                                     wxWindow*        dropWindow2,
                                     wxDirPickerCtrl* dirPicker,
                                     wxComboBox*      dirName) :
    dropWindow1_(dropWindow1),
    dropWindow2_(dropWindow2),
    dirPicker_(dirPicker),
    dirName_(dirName)
{
    //prepare drag & drop
    dropWindow1->SetDropTarget(new WindowDropTarget(dropWindow1)); //takes ownership
    dropWindow2->SetDropTarget(new WindowDropTarget(dropWindow2)); //takes ownership

    //redirect drag & drop event back to this class
    dropWindow1->Connect(FFS_DROP_FILE_EVENT, FFSFileDropEventHandler(DragDropOnMainDlg::OnFilesDropped), NULL, this);
    dropWindow2->Connect(FFS_DROP_FILE_EVENT, FFSFileDropEventHandler(DragDropOnMainDlg::OnFilesDropped), NULL, this);

    //keep dirPicker and dirName synchronous
    dirName->  Connect( wxEVT_COMMAND_TEXT_UPDATED,      wxCommandEventHandler(      DragDropOnMainDlg::OnWriteDirManually), NULL, this );
    dirPicker->Connect( wxEVT_COMMAND_DIRPICKER_CHANGED, wxFileDirPickerEventHandler(DragDropOnMainDlg::OnDirSelected),      NULL, this );
}


void DragDropOnMainDlg::OnFilesDropped(FFSFileDropEvent& event)
{
    if (event.filesDropped_.empty())
        return;

    if (    this->dropWindow1_ == event.dropWindow_ || //file may be dropped on window 1 or 2
            this->dropWindow2_ == event.dropWindow_)
    {
        if (AcceptDrop(event.filesDropped_))
        {
            wxString fileName = event.filesDropped_[0];
            if (wxDirExists(fileName))
            {
                dirName_->SetSelection(wxNOT_FOUND);
                dirName_->SetValue(fileName);
                dirPicker_->SetPath(fileName);
            }
            else
            {
                fileName = wxFileName(fileName).GetPath();
                if (wxDirExists(fileName))
                {
                    dirName_->SetSelection(wxNOT_FOUND);
                    dirName_->SetValue(fileName);
                    dirPicker_->SetPath(fileName);
                }
            }
        }
    }
}


void DragDropOnMainDlg::OnWriteDirManually(wxCommandEvent& event)
{
    const Zstring newDir = getFormattedDirectoryName(wxToZ(event.GetString()));

    if (util::dirExists(newDir, 100) == util::EXISTING_TRUE) //potentially slow network access: wait 100 ms at most
        dirPicker_->SetPath(zToWx(newDir));

    event.Skip();
}


void DragDropOnMainDlg::OnDirSelected(wxFileDirPickerEvent& event)
{
    const wxString newPath = event.GetPath();
    dirName_->SetSelection(wxNOT_FOUND);
    dirName_->SetValue(newPath);

    event.Skip();
}

//##############################################################################################################


using ffs3::DragDropOnDlg;

DragDropOnDlg::DragDropOnDlg(wxWindow*        dropWindow,
                             wxDirPickerCtrl* dirPicker,
                             wxTextCtrl*      dirName) :
    dropWindow_(dropWindow),
    dirPicker_(dirPicker),
    dirName_(dirName)
{
    //prepare drag & drop
    dropWindow->SetDropTarget(new WindowDropTarget(dropWindow)); //takes ownership

    //redirect drag & drop event back to this class
    dropWindow->Connect(FFS_DROP_FILE_EVENT, FFSFileDropEventHandler(DragDropOnDlg::OnFilesDropped), NULL, this);

    //keep dirPicker and dirName synchronous
    dirName->Connect( wxEVT_COMMAND_TEXT_UPDATED, wxCommandEventHandler( DragDropOnDlg::OnWriteDirManually ), NULL, this );
    dirPicker->Connect( wxEVT_COMMAND_DIRPICKER_CHANGED, wxFileDirPickerEventHandler( DragDropOnDlg::OnDirSelected ), NULL, this );
}


void DragDropOnDlg::OnFilesDropped(FFSFileDropEvent& event)
{
    if (event.filesDropped_.empty())
        return;

    if (this->dropWindow_ == event.dropWindow_)
    {
        wxString fileName = event.filesDropped_[0];
        if (wxDirExists(fileName))
        {
            dirName_->SetValue(fileName);
            dirPicker_->SetPath(fileName);
        }
        else
        {
            fileName = wxFileName(fileName).GetPath();
            if (wxDirExists(fileName))
            {
                dirName_->SetValue(fileName);
                dirPicker_->SetPath(fileName);
            }
        }
    }
}


void DragDropOnDlg::OnWriteDirManually(wxCommandEvent& event)
{
    const Zstring newDir = ffs3::getFormattedDirectoryName(wxToZ(event.GetString()));
    if (util::dirExists(newDir, 100) == util::EXISTING_TRUE) //potentially slow network access: wait 100 ms at most
        dirPicker_->SetPath(zToWx(newDir));

    event.Skip();
}


void DragDropOnDlg::OnDirSelected(wxFileDirPickerEvent& event)
{
    const wxString newPath = event.GetPath();
    dirName_->SetValue(newPath);

    event.Skip();
}