///|/ Copyright (c) Prusa Research 2018 - 2023 Enrico Turri @enricoturri1966, Oleksandra Iushchenko @YuSanka, Vojtěch Bubník @bubnikv, Lukáš Matěna @lukasmatena, Filip Sykala @Jony01, David Kocík @kocikdav, Tomáš Mészáros @tamasmeszaros, Vojtěch Král @vojtechkral
///|/ Copyright (c) 2022 André Althaus
///|/ Copyright (c) 2019 John Drake @foxox
///|/
///|/ PrusaSlicer is released under the terms of the AGPLv3 or higher
///|/
//#include "stdlib.h"
#include "libslic3r/libslic3r.h"
#include "libslic3r/Layer.hpp"
#include "GUI_Preview.hpp"
#include "GUI_App.hpp"
#include "GUI.hpp"
#include "GUI_Init.hpp"
#include "I18N.hpp"
#include "3DScene.hpp"
#include "BackgroundSlicingProcess.hpp"
#include "OpenGLManager.hpp"
#include "GLCanvas3D.hpp"
#include "libslic3r/PresetBundle.hpp"
#include "DoubleSliderForGcode.hpp"
#include "DoubleSliderForLayers.hpp"
#include "ExtruderSequenceDialog.hpp"
#include "Plater.hpp"
#include "MainFrame.hpp"
#include "MsgDialog.hpp"
#include "format.hpp"

#include <wx/listbook.h>
#include <wx/notebook.h>
#include <wx/glcanvas.h>
#include <wx/sizer.h>
#include <wx/stattext.h>
#include <wx/choice.h>
#include <wx/combo.h>
#include <wx/combobox.h>
#include <wx/checkbox.h>
#include <wx/colordlg.h>

// this include must follow the wxWidgets ones or it won't compile on Windows -> see http://trac.wxwidgets.org/ticket/2421
#include "libslic3r/Print.hpp"
#include "libslic3r/SLAPrint.hpp"
#include "NotificationManager.hpp"

#ifdef _WIN32
#include "BitmapComboBox.hpp"
#endif

namespace Slic3r {
namespace GUI {

View3D::View3D(wxWindow* parent, Bed3D& bed, Model* model, DynamicPrintConfig* config, BackgroundSlicingProcess* process)
    : m_canvas_widget(nullptr)
    , m_canvas(nullptr)
{
    init(parent, bed, model, config, process);
}

View3D::~View3D()
{
    delete m_canvas;
    delete m_canvas_widget;
}

bool View3D::init(wxWindow* parent, Bed3D& bed, Model* model, DynamicPrintConfig* config, BackgroundSlicingProcess* process)
{
    if (!Create(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, 0 /* disable wxTAB_TRAVERSAL */))
        return false;

    const GUI_InitParams* const init_params = wxGetApp().init_params;
    m_canvas_widget = OpenGLManager::create_wxglcanvas(*this, (init_params != nullptr) ? init_params->opengl_aa : false);
    if (m_canvas_widget == nullptr)
        return false;

    m_canvas = new GLCanvas3D(m_canvas_widget, bed);
    m_canvas->set_context(wxGetApp().init_glcontext(*m_canvas_widget));

    m_canvas->allow_multisample(OpenGLManager::can_multisample());

    m_canvas->enable_picking(true);
    m_canvas->get_selection().set_mode(Selection::Instance);
    m_canvas->enable_moving(true);
    // XXX: more config from 3D.pm
    m_canvas->set_model(model);
    m_canvas->set_process(process);
    m_canvas->set_config(config);
    m_canvas->enable_gizmos(true);
    m_canvas->enable_selection(true);
    m_canvas->enable_main_toolbar(true);
    m_canvas->enable_undoredo_toolbar(true);
    m_canvas->enable_labels(true);
    m_canvas->enable_slope(true);

    wxBoxSizer* main_sizer = new wxBoxSizer(wxVERTICAL);
    main_sizer->Add(m_canvas_widget, 1, wxALL | wxEXPAND, 0);

    SetSizer(main_sizer);
    SetMinSize(GetSize());
    GetSizer()->SetSizeHints(this);

    return true;
}

void View3D::set_as_dirty()
{
    if (m_canvas != nullptr)
        m_canvas->set_as_dirty();
}

void View3D::bed_shape_changed()
{
    if (m_canvas != nullptr)
        m_canvas->bed_shape_changed();
}

void View3D::select_view(const std::string& direction)
{
    if (m_canvas != nullptr)
        m_canvas->select_view(direction);
}

void View3D::select_all()
{
    if (m_canvas != nullptr)
        m_canvas->select_all();
}

void View3D::deselect_all()
{
    if (m_canvas != nullptr)
        m_canvas->deselect_all();
}

void View3D::delete_selected()
{
    if (m_canvas != nullptr)
        m_canvas->delete_selected();
}

void View3D::mirror_selection(Axis axis)
{
    if (m_canvas != nullptr)
        m_canvas->mirror_selection(axis);
}

bool View3D::is_layers_editing_enabled() const
{
    return (m_canvas != nullptr) ? m_canvas->is_layers_editing_enabled() : false;
}

bool View3D::is_layers_editing_allowed() const
{
    return (m_canvas != nullptr) ? m_canvas->is_layers_editing_allowed() : false;
}

void View3D::enable_layers_editing(bool enable)
{
    if (m_canvas != nullptr)
        m_canvas->enable_layers_editing(enable);
}

bool View3D::is_dragging() const
{
    return (m_canvas != nullptr) ? m_canvas->is_dragging() : false;
}

bool View3D::is_reload_delayed() const
{
    return (m_canvas != nullptr) ? m_canvas->is_reload_delayed() : false;
}

void View3D::reload_scene(bool refresh_immediately, bool force_full_scene_refresh)
{
    if (m_canvas != nullptr)
        m_canvas->reload_scene(refresh_immediately, force_full_scene_refresh);
}

void View3D::render()
{
    if (m_canvas != nullptr)
        //m_canvas->render();
        m_canvas->set_as_dirty();
}

Preview::Preview(
    wxWindow* parent, Bed3D& bed, Model* model, DynamicPrintConfig* config,
    BackgroundSlicingProcess* process, GCodeProcessorResult* gcode_result, std::function<void()> schedule_background_process_func)
    : m_config(config)
    , m_process(process)
    , m_gcode_result(gcode_result)
    , m_schedule_background_process(schedule_background_process_func)
{
    if (init(parent, bed, model))
        load_print();
}

void Preview::set_layers_slider_values_range(int bottom, int top)
{
    m_layers_slider->SetSelectionSpan(std::min(top, m_layers_slider->GetMaxPos()),
                                      std::max(bottom, m_layers_slider->GetMinPos()));
}

bool Preview::init(wxWindow* parent, Bed3D& bed, Model* model)
{
    if (!Create(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, 0 /* disable wxTAB_TRAVERSAL */))
        return false;

    // to match the background of the sliders
#ifdef _WIN32 
    wxGetApp().UpdateDarkUI(this);
#else
    SetBackgroundColour(GetParent()->GetBackgroundColour());
#endif // _WIN32 

    const GUI_InitParams* const init_params = wxGetApp().init_params;
    m_canvas_widget = OpenGLManager::create_wxglcanvas(*this, (init_params != nullptr) ? init_params->opengl_aa : false);
    if (m_canvas_widget == nullptr)
        return false;

    m_canvas = new GLCanvas3D(m_canvas_widget, bed);
    m_canvas->set_context(wxGetApp().init_glcontext(*m_canvas_widget));
    m_canvas->allow_multisample(OpenGLManager::can_multisample());
    m_canvas->set_config(m_config);
    m_canvas->set_model(model);
    m_canvas->set_process(m_process);
    m_canvas->show_legend(true);
    m_canvas->enable_dynamic_background(true);

    create_sliders();

    m_left_sizer = new wxBoxSizer(wxVERTICAL);
    m_left_sizer->Add(m_canvas_widget, 1, wxALL | wxEXPAND, 0);

    wxBoxSizer* main_sizer = new wxBoxSizer(wxHORIZONTAL);
    main_sizer->Add(m_left_sizer, 1, wxALL | wxEXPAND, 0);

    SetSizer(main_sizer);
    SetMinSize(GetSize());
    GetSizer()->SetSizeHints(this);

    bind_event_handlers();
    
    return true;
}

Preview::~Preview()
{
    unbind_event_handlers();

    if (m_canvas != nullptr)
        delete m_canvas;

    if (m_canvas_widget != nullptr)
        delete m_canvas_widget;
}

void Preview::set_as_dirty()
{
    if (m_canvas != nullptr)
        m_canvas->set_as_dirty();
}

void Preview::bed_shape_changed()
{
    if (m_canvas != nullptr)
        m_canvas->bed_shape_changed();
}

void Preview::select_view(const std::string& direction)
{
    m_canvas->select_view(direction);
}

void Preview::set_drop_target(wxDropTarget* target)
{
    if (target != nullptr)
        SetDropTarget(target);
}

void Preview::load_gcode_shells()
{
    m_canvas->load_gcode_shells();
}

void Preview::load_print(bool keep_z_range)
{
    PrinterTechnology tech = m_process->current_printer_technology();
    if (tech == ptFFF)
        load_print_as_fff(keep_z_range);
    else if (tech == ptSLA)
        load_print_as_sla();

    Layout();
}

void Preview::reload_print()
{
    if (!IsShown())
        return;

    m_loaded = false;
    load_print();
}

void Preview::msw_rescale()
{
    m_layers_slider->SetEmUnit(wxGetApp().em_unit());
    m_moves_slider->SetEmUnit(wxGetApp().em_unit());
    // rescale warning legend on the canvas
    get_canvas3d()->msw_rescale();

    // rescale legend
    reload_print();
}

void Preview::render_sliders(GLCanvas3D& canvas)
{
    const Size  cnv_size        = canvas.get_canvas_size();
    const int   canvas_width    = cnv_size.get_width();
    const int   canvas_height   = cnv_size.get_height();
    const float extra_scale     = cnv_size.get_scale_factor();

    GLToolbar& collapse_toolbar = wxGetApp().plater()->get_collapse_toolbar();
    const bool  is_collapse_btn_shown = collapse_toolbar.is_enabled();

    if (m_layers_slider)
        m_layers_slider->Render(canvas_width, canvas_height, extra_scale, is_collapse_btn_shown ? collapse_toolbar.get_height() : 0.f);
    if (m_moves_slider)
        m_moves_slider->Render(canvas_width, canvas_height, extra_scale);
}

float Preview::get_moves_slider_height() const
{
    if (m_moves_slider && m_moves_slider->IsShown())
        return m_moves_slider->GetHeight();
    return 0.0f;
}

float Preview::get_layers_slider_width() const
{
    if (m_layers_slider && m_layers_slider->IsShown())
        return m_layers_slider->GetWidth();
    return 0.0f;
}

void Preview::bind_event_handlers()
{
    Bind(wxEVT_SIZE, &Preview::on_size, this);
}

void Preview::unbind_event_handlers()
{
    Unbind(wxEVT_SIZE, &Preview::on_size, this);
}

void Preview::hide_layers_slider()
{
    m_layers_slider->Hide();
}

void Preview::on_size(wxSizeEvent& evt)
{
    evt.Skip();
    m_layers_slider->force_ruler_update();
    Refresh();
}

/* To avoid get an empty string from wxTextEntryDialog
 * Let disable OK button, if TextCtrl is empty
 * */
static void upgrade_text_entry_dialog(wxTextEntryDialog* dlg, double min = -1.0, double max = -1.0)
{
    GUI::wxGetApp().UpdateDlgDarkUI(dlg);

    // detect TextCtrl and OK button
    wxWindowList& dlg_items = dlg->GetChildren();
    for (auto item : dlg_items) {
        if (wxTextCtrl* textctrl = dynamic_cast<wxTextCtrl*>(item)) {
            textctrl->SetInsertionPointEnd();

            wxButton* btn_OK = static_cast<wxButton*>(dlg->FindWindowById(wxID_OK));
            btn_OK->Bind(wxEVT_UPDATE_UI, [textctrl](wxUpdateUIEvent& evt) {
                evt.Enable(!textctrl->IsEmpty());
            }, btn_OK->GetId());

            break;
        }
    }   
}

void Preview::create_sliders()
{
    // Layers Slider

    m_layers_slider = std::make_unique<DoubleSlider::DSForLayers>(0, 0, 0, 100, wxGetApp().is_editor());
    m_layers_slider->SetEmUnit(wxGetApp().em_unit());
    m_layers_slider->set_imgui_wrapper(wxGetApp().imgui());
    m_layers_slider->show_estimated_times(wxGetApp().app_config->get_bool("show_estimated_times_in_dbl_slider"));
    m_layers_slider->show_ruler(wxGetApp().app_config->get_bool("show_ruler_in_dbl_slider"), wxGetApp().app_config->get_bool("show_ruler_bg_in_dbl_slider"));

    m_layers_slider->SetDrawMode(wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptSLA,
                                 wxGetApp().preset_bundle->prints.get_edited_preset().config.opt_bool("complete_objects"));

    m_layers_slider->set_callback_on_thumb_move( [this]() -> void { Preview::on_layers_slider_scroll_changed(); } );

    m_layers_slider->set_callback_on_change_app_config([this](const std::string& key, const std::string& val)   -> void {
        wxGetApp().app_config->set(key, val);
    });

    if (wxGetApp().is_editor()) {
        m_layers_slider->set_callback_on_ticks_changed([this]()                 -> void {
            Model& model = wxGetApp().plater()->model();
            model.custom_gcode_per_print_z = m_layers_slider->GetTicksValues();
            m_schedule_background_process();

            m_keep_current_preview_type = false;
            reload_print();
        });

        m_layers_slider->set_callback_on_check_gcode([this](CustomGCode::Type type) -> void {
            if (type == ColorChange && m_layers_slider->gcode(ColorChange).empty())
                GUI::wxGetApp().plater()->get_notification_manager()->push_notification(GUI::NotificationType::EmptyColorChangeCode);
        });

        m_layers_slider->set_callback_on_empty_auto_color_change([]()                         -> void {
            GUI::wxGetApp().plater()->get_notification_manager()->push_notification(GUI::NotificationType::EmptyAutoColorChange);
        });

        m_layers_slider->set_callback_on_get_extruder_colors([]()               -> std::vector<std::string> {
            return wxGetApp().plater()->get_extruder_color_strings_from_plater_config();
        });

        m_layers_slider->set_callback_on_get_print([]()                         -> const Print& {
            return GUI::wxGetApp().plater()->fff_print();
        });

        m_layers_slider->set_callback_on_get_custom_code([](const std::string& code_in, double height) -> std::string 
        {
            wxString msg_text = _L("Enter custom G-code used on current layer") + ":";
            wxString msg_header = format_wxstr(_L("Custom G-code on current layer (%1% mm)."), height);

            // get custom gcode
            wxTextEntryDialog dlg(nullptr, msg_text, msg_header, code_in,
                wxTextEntryDialogStyle | wxTE_MULTILINE);
            upgrade_text_entry_dialog(&dlg);

            bool valid = true;
            std::string value;
            do {
                if (dlg.ShowModal() != wxID_OK)
                    return "";

                value = into_u8(dlg.GetValue());
                valid = true;// GUI::Tab::validate_custom_gcode("Custom G-code", value); // !ysFIXME validate_custom_gcode
            } while (!valid);
            return value;
        });

        m_layers_slider->set_callback_on_get_pause_print_msg([](const std::string& msg_in, double height) -> std::string
        {
            wxString msg_text = _L("Enter short message shown on Printer display when a print is paused") + ":";
            wxString msg_header = format_wxstr(_L("Message for pause print on current layer (%1% mm)."), height);

            // get custom gcode
            wxTextEntryDialog dlg(nullptr, msg_text, msg_header, from_u8(msg_in),
                wxTextEntryDialogStyle);
            upgrade_text_entry_dialog(&dlg);

            if (dlg.ShowModal() != wxID_OK || dlg.GetValue().IsEmpty())
                return "";

            return into_u8(dlg.GetValue());
        });

        m_layers_slider->set_callback_on_get_new_color([](const std::string& color) -> std::string
        {
            wxColour clr(color);
            if (!clr.IsOk())
                clr = wxColour(0, 0, 0); // Don't set alfa to transparence

            auto data = new wxColourData();
            data->SetChooseFull(1);
            data->SetColour(clr);

            wxColourDialog dialog(GUI::wxGetApp().GetTopWindow(), data);
            dialog.CenterOnParent();
            if (dialog.ShowModal() == wxID_OK)
                return dialog.GetColourData().GetColour().GetAsString(wxC2S_HTML_SYNTAX).ToStdString();
            return "";
        });

        m_layers_slider->set_callback_on_show_info_msg([this](const std::string& message, int btns_flag) -> int
        {
            GUI::MessageDialog msg(this, from_u8(message), _L("Notice"), btns_flag);
            int ret = msg.ShowModal();
            return ret == wxID_YES      ? wxYES     :
                   ret == wxID_NO       ? wxNO      :
                   ret == wxID_CANCEL   ? wxCANCEL  : -1;
        });

        m_layers_slider->set_callback_on_show_warning_msg([this](const std::string& message, int btns_flag) -> int
        {
            GUI::WarningDialog msg(this, from_u8(message), _L("Warning"), btns_flag);
            int ret = msg.ShowModal();
            return ret == wxID_YES      ? wxYES     :
                   ret == wxID_NO       ? wxNO      :
                   ret == wxID_CANCEL   ? wxCANCEL  : -1;
        });

        m_layers_slider->set_callback_on_get_extruders_cnt([]() -> int
        {
            return GUI::wxGetApp().extruders_edited_cnt();
        });

        m_layers_slider->set_callback_on_get_extruders_sequence([](DoubleSlider::ExtrudersSequence& extruders_sequence) -> bool
        {
            GUI::ExtruderSequenceDialog dlg(extruders_sequence);
            if (dlg.ShowModal() != wxID_OK)
                return false;
            extruders_sequence = dlg.GetValue();
            return true;
        });
    }

    // Move Gcode Slider

    m_moves_slider = std::make_unique<DoubleSlider::DSForGcode>(0, 0, 0, 100);
    m_moves_slider->SetEmUnit(wxGetApp().em_unit());

    m_moves_slider->set_callback_on_thumb_move([this]() ->void { on_moves_slider_scroll_changed(); });

    // m_canvas_widget
    m_canvas_widget->Bind(wxEVT_KEY_DOWN,                    &Preview::update_sliders_from_canvas, this);
    m_canvas_widget->Bind(EVT_GLCANVAS_SLIDERS_MANIPULATION, &Preview::update_sliders_from_canvas, this);

    // Hide sliders from the very begibing. Visibility will be set later
    m_layers_slider->Hide();
    m_moves_slider->Hide();
}

// Find an index of a value in a sorted vector, which is in <z-eps, z+eps>.
// Returns -1 if there is no such member.
static int find_close_layer_idx(const std::vector<double>& zs, double &z, double eps)
{
    if (zs.empty())
        return -1;
    auto it_h = std::lower_bound(zs.begin(), zs.end(), z);
    if (it_h == zs.end()) {
        auto it_l = it_h;
        -- it_l;
        if (z - *it_l < eps)
            return int(zs.size() - 1);
    } else if (it_h == zs.begin()) {
        if (*it_h - z < eps)
            return 0;
    } else {
        auto it_l = it_h;
        -- it_l;
        double dist_l = z - *it_l;
        double dist_h = *it_h - z;
        if (std::min(dist_l, dist_h) < eps) {
            return (dist_l < dist_h) ? int(it_l - zs.begin()) : int(it_h - zs.begin());
        }
    }
    return -1;
}

void Preview::check_layers_slider_values(std::vector<CustomGCode::Item>& ticks_from_model, const std::vector<double>& layers_z)
{
    // All ticks that would end up outside the slider range should be erased.
    // TODO: this should be placed into more appropriate part of code,
    // this function is e.g. not called when the last object is deleted
    unsigned int old_size = ticks_from_model.size();
    ticks_from_model.erase(std::remove_if(ticks_from_model.begin(), ticks_from_model.end(),
                     [layers_z](CustomGCode::Item val)
        {
            auto it = std::lower_bound(layers_z.begin(), layers_z.end(), val.print_z - CustomGCode::epsilon());
            return it == layers_z.end();
        }),
        ticks_from_model.end());
    if (ticks_from_model.size() != old_size)
        m_schedule_background_process();
}

void Preview::update_layers_slider(const std::vector<double>& layers_z, bool keep_z_range)
{
    // Save the initial slider span.
    double z_low = m_layers_slider->GetLowerValue();
    double z_high = m_layers_slider->GetHigherValue();
    bool   was_empty = m_layers_slider->GetMaxPos() == 0;

    bool force_sliders_full_range = was_empty;
    if (!keep_z_range) {
        bool span_changed = layers_z.empty() || std::abs(layers_z.back() - m_layers_slider->GetMaxValue()) > CustomGCode::epsilon()/*1e-6*/;
        force_sliders_full_range |= span_changed;
    }
    bool   snap_to_min = force_sliders_full_range || m_layers_slider->IsLowerAtMin();
    bool   snap_to_max = force_sliders_full_range || m_layers_slider->IsHigherAtMax();

    // Detect and set manipulation mode for double slider
    update_layers_slider_mode();

    Plater* plater = wxGetApp().plater();
    CustomGCode::Info ticks_info_from_model;
    if (wxGetApp().is_editor())
        ticks_info_from_model = plater->model().custom_gcode_per_print_z;
    else {
        ticks_info_from_model.mode = CustomGCode::Mode::SingleExtruder;
        ticks_info_from_model.gcodes = m_gcode_result->custom_gcode_per_print_z;
    }
    check_layers_slider_values(ticks_info_from_model.gcodes, layers_z);

    //first of all update extruder colors to avoid crash, when we are switching printer preset from MM to SM
    m_layers_slider->SetExtruderColors(plater->get_extruder_color_strings_from_plater_config(wxGetApp().is_editor() ? nullptr : m_gcode_result));
    m_layers_slider->SetSliderValues(layers_z);
    m_layers_slider->force_ruler_update();
    assert(m_layers_slider->GetMinPos() == 0);

    m_layers_slider->Freeze();

    m_layers_slider->SetMaxPos(layers_z.empty() ? 0 : layers_z.size() - 1);

    int idx_low = 0;
    int idx_high = m_layers_slider->GetMaxPos();
    if (!layers_z.empty()) {
        if (!snap_to_min) {
            int idx_new = find_close_layer_idx(layers_z, z_low, CustomGCode::epsilon()/*1e-6*/);
            if (idx_new != -1)
                idx_low = idx_new;
        }
        if (!snap_to_max) {
            int idx_new = find_close_layer_idx(layers_z, z_high, CustomGCode::epsilon()/*1e-6*/);
            if (idx_new != -1)
                idx_high = idx_new;
        }
    }
    m_layers_slider->SetSelectionSpan(idx_low, idx_high);
    m_layers_slider->SetTicksValues(ticks_info_from_model);

    bool sla_print_technology = plater->printer_technology() == ptSLA;
    bool sequential_print = wxGetApp().preset_bundle->prints.get_edited_preset().config.opt_bool("complete_objects");
    m_layers_slider->SetDrawMode(sla_print_technology, sequential_print);
    if (sla_print_technology)
        m_layers_slider->SetLayersTimes(plater->sla_print().print_statistics().layers_times_running_total);
    else
        m_layers_slider->SetLayersTimes(m_canvas->get_gcode_layers_times_cache(), m_gcode_result->print_statistics.modes.front().time);

    m_layers_slider->Thaw();

    // check if ticks_info_from_model contains ColorChange g-code
    bool color_change_already_exists = false;
    for (const CustomGCode::Item& gcode: ticks_info_from_model.gcodes)
        if (gcode.type == CustomGCode::Type::ColorChange) {
            color_change_already_exists = true;
            break;
        }

    auto get_print_obj_idxs = [plater]() ->std::string {
        if (plater->printer_technology() == ptSLA)
            return "sla";
        const Print& print = GUI::wxGetApp().plater()->fff_print();
        std::string idxs;
        for (auto object : print.objects())
            idxs += std::to_string(object->id().id) + "_";
        return idxs;
    };

    // Suggest the auto color change, if model looks like sign
    if (!color_change_already_exists &&
        wxGetApp().app_config->get_bool("allow_auto_color_change") &&
        m_layers_slider->is_new_print(get_print_obj_idxs()))
    {
        const Print& print = wxGetApp().plater()->fff_print();

        //bool is_possible_auto_color_change = false;
        for (auto object : print.objects()) {
            double object_x = double(object->size().x());
            double object_y = double(object->size().y());

            // if it's sign, than object have not to be a too height
            double height = object->height();
            coord_t longer_side = std::max(object_x, object_y);
            auto   num_layers = int(object->layers().size());
            if (height / longer_side > 0.3 || num_layers < 2)
                continue;

            const ExPolygons& bottom = object->get_layer(0)->lslices;
            double bottom_area = area(bottom);

            // at least 25% of object's height have to be a solid 
            int  i, min_solid_height = int(0.25 * num_layers);
            for (i = 1; i <= min_solid_height; ++ i) {
                double cur_area = area(object->get_layer(i)->lslices);
                if (!DoubleSlider::equivalent_areas(bottom_area, cur_area)) {
                    // but due to the elephant foot compensation, the first layer may be slightly smaller than the others
                    if (i == 1 && fabs(cur_area - bottom_area) / bottom_area < 0.1) {
                        // So, let process this case and use second layer as a bottom 
                        bottom_area = cur_area;
                        continue;
                    }
                    break;
                }
            }
            if (i < min_solid_height)
                continue;

            if (DoubleSlider::check_color_change(object, i, num_layers, true, [this, object](const Layer*) {
                NotificationManager* notif_mngr = wxGetApp().plater()->get_notification_manager();
                notif_mngr->push_notification(
                    NotificationType::SignDetected, NotificationManager::NotificationLevel::PrintInfoNotificationLevel,
                    _u8L("NOTE:") + "\n" +
                    format(_u8L("Sliced object \"%1%\" looks like a logo or a sign"), object->model_object()->name) + "\n",
                    _u8L("Apply color change automatically"),
                    [this](wxEvtHandler*) {
                        m_layers_slider->auto_color_change();
                        return true;
                    });

                notif_mngr->apply_in_preview();
                return true;
            }) )
                // first object with color chnages is found
                break;
        }
    }
    m_layers_slider->Show();
}

void Preview::update_layers_slider_mode()
{
    //    true  -> single-extruder printer profile OR 
    //             multi-extruder printer profile , but whole model is printed by only one extruder
    //    false -> multi-extruder printer profile , and model is printed by several extruders
    bool    one_extruder_printed_model = true;

    // extruder used for whole model for multi-extruder printer profile
    int     only_extruder = -1; 

    if (wxGetApp().extruders_edited_cnt() > 1)
    {
        const ModelObjectPtrs& objects = wxGetApp().plater()->model().objects;

        // check if whole model uses just only one extruder
        if (!objects.empty())
        {
            const int extruder = objects[0]->config.has("extruder") ?
                                 objects[0]->config.option("extruder")->getInt() : 0;

            auto is_one_extruder_printed_model = [objects, extruder]()
            {
                for (ModelObject* object : objects)
                {
                    if (object->config.has("extruder") &&
                        object->config.option("extruder")->getInt() != extruder)
                        return false;

                    for (ModelVolume* volume : object->volumes)
                        if ((volume->config.has("extruder") && 
                            volume->config.option("extruder")->getInt() != 0 && // extruder isn't default
                            volume->config.option("extruder")->getInt() != extruder) ||
                            !volume->mm_segmentation_facets.empty())
                            return false;

                    for (const auto& range : object->layer_config_ranges)
                        if (range.second.has("extruder") &&
                            range.second.option("extruder")->getInt() != 0 && // extruder isn't default
                            range.second.option("extruder")->getInt() != extruder)
                            return false;
                }
                return true;
            };

            if (is_one_extruder_printed_model())
                only_extruder = extruder;
            else
                one_extruder_printed_model = false;
        }
    }

    m_layers_slider->SetModeAndOnlyExtruder(one_extruder_printed_model, only_extruder);
}

void Preview::reset_layers_slider()
{
    m_layers_slider->SetSelectionSpan(0, 0);
}

void Preview::update_sliders_from_canvas(wxKeyEvent& event)
{
    const auto key = event.GetKeyCode();

    const bool can_edit = wxGetApp().is_editor();

    if (can_edit && (key == WXK_NUMPAD_ADD || key == '+'))
        m_layers_slider->add_current_tick();
    else if (can_edit && (key == WXK_NUMPAD_SUBTRACT || key == WXK_DELETE || key == WXK_BACK || key == '-'))
        m_layers_slider->delete_current_tick();
    else if (key == 'G' || key == 'g')
        m_layers_slider->jump_to_value();
    else if (key == WXK_LEFT || key == WXK_RIGHT || key == WXK_UP || key == WXK_DOWN) {
        int delta = 1;
        // accelerators
        int accelerator = 0;
        if (wxGetKeyState(WXK_SHIFT))
            accelerator += 5;
        if (wxGetKeyState(WXK_CONTROL))
            accelerator += 5;
        if (accelerator > 0)
            delta *= accelerator;

        if (key == WXK_LEFT || key == WXK_RIGHT)
            m_moves_slider->move_current_thumb(delta * (key == WXK_LEFT ? 1 : -1));
        else if (key == WXK_UP || key == WXK_DOWN)
            m_layers_slider->move_current_thumb(delta * (key == WXK_DOWN ? 1 : -1));
    }

    else if (event.HasModifiers()) {
        event.Skip();
        return;
    }

    else if (key == 'S' || key == 'W') {
        const int new_pos = key == 'W' ? m_layers_slider->GetHigherPos() + 1 : m_layers_slider->GetHigherPos() - 1;
        m_layers_slider->SetHigherPos(new_pos);
    }
    else if (key == 'A' || key == 'D') {
        const int new_pos = key == 'D' ? m_moves_slider->GetHigherPos() + 1 : m_moves_slider->GetHigherPos() - 1;
        m_moves_slider->SetHigherPos(new_pos);
    }
    else if (key == 'X')
        m_layers_slider->ChangeOneLayerLock();
    else
        event.Skip();
}

void Preview::update_moves_slider(std::optional<int> visible_range_min, std::optional<int> visible_range_max)
{
    if (m_gcode_result->moves.empty())
        return;

    const libvgcode::Interval& range = m_canvas->get_gcode_view_enabled_range();
    uint32_t last_gcode_id = m_canvas->get_gcode_vertex_at(range[0]).gcode_id;
    std::optional<uint32_t> gcode_id_min = visible_range_min.has_value() ?
        std::optional<uint32_t>{ m_canvas->get_gcode_vertex_at(*visible_range_min).gcode_id } : std::nullopt;
    std::optional<uint32_t> gcode_id_max = visible_range_max.has_value() ?
        std::optional<uint32_t>{ m_canvas->get_gcode_vertex_at(*visible_range_max).gcode_id } : std::nullopt;

    const size_t range_size = range[1] - range[0] + 1;
    std::vector<unsigned int> values;
    values.reserve(range_size);
    std::vector<unsigned int> alternate_values;
    alternate_values.reserve(range_size);

    std::optional<uint32_t> visible_range_min_id;
    std::optional<uint32_t> visible_range_max_id;
    uint32_t counter = 0;

    for (size_t i = range[0]; i <= range[1]; ++i) {
        const uint32_t gcode_id = m_canvas->get_gcode_vertex_at(i).gcode_id;
        bool skip = false;
        if (i > range[0]) {
            // skip consecutive moves with same gcode id (resulting from processing G2 and G3 lines)
            if (last_gcode_id == gcode_id) {
                values.back() = i + 1;
                skip = true;
            }
            else
                last_gcode_id = gcode_id;
        }

        if (!skip) {
            values.emplace_back(i + 1);
            alternate_values.emplace_back(gcode_id);
            if (gcode_id_min.has_value() && alternate_values.back() == *gcode_id_min)
                visible_range_min_id = counter;
            else if (gcode_id_max.has_value() && alternate_values.back() == *gcode_id_max)
                visible_range_max_id = counter;
            ++counter;
        }
    }

    const int span_min_id = visible_range_min_id.has_value() ? *visible_range_min_id : 0;
    const int span_max_id = visible_range_max_id.has_value() ? *visible_range_max_id : static_cast<int>(values.size()) - 1;

    m_moves_slider->SetSliderValues(values);
    m_moves_slider->SetSliderAlternateValues(alternate_values);

    m_moves_slider->Freeze();
    m_moves_slider->SetMaxPos(static_cast<int>(values.size()) - 1);
    m_moves_slider->SetSelectionSpan(span_min_id, span_max_id);
    m_moves_slider->Thaw();

    m_moves_slider->ShowLowerThumb(get_app_config()->get("seq_top_layer_only") == "0");
}

void Preview::enable_moves_slider(bool enable)
{
    bool render_as_disabled = !enable;
    if (m_moves_slider != nullptr && m_moves_slider->is_rendering_as_disabled() != render_as_disabled) {
        m_moves_slider->set_render_as_disabled(render_as_disabled);
    }
}

void Preview::load_print_as_fff(bool keep_z_range)
{
    if (wxGetApp().mainframe == nullptr || wxGetApp().is_recreating_gui())
        // avoid processing while mainframe is being constructed
        return;

    if (m_loaded || m_process->current_printer_technology() != ptFFF)
        return;

    // we require that there's at least one object and the posSlice step
    // is performed on all of them(this ensures that _shifted_copies was
    // populated and we know the number of layers)
    bool has_layers = false;
    const Print *print = m_process->fff_print();
    if (print->is_step_done(posSlice)) {
        for (const PrintObject* print_object : print->objects())
            if (! print_object->layers().empty()) {
                has_layers = true;
                break;
            }
    }
	if (print->is_step_done(posSupportMaterial)) {
        for (const PrintObject* print_object : print->objects())
            if (! print_object->support_layers().empty()) {
                has_layers = true;
                break;
            }
    }

    if (wxGetApp().is_editor() && !has_layers) {
        m_canvas->reset_gcode_layers_times_cache();
        hide_layers_slider();
        m_moves_slider->Hide();
        m_canvas_widget->Refresh();
        return;
    }

    libvgcode::EViewType gcode_view_type = m_canvas->get_gcode_view_type();
    const bool gcode_preview_data_valid = !m_gcode_result->moves.empty();
    const bool is_pregcode_preview = !gcode_preview_data_valid && wxGetApp().is_editor();

    const std::vector<std::string> tool_colors = wxGetApp().plater()->get_extruder_color_strings_from_plater_config(m_gcode_result);
    const std::vector<CustomGCode::Item>& color_print_values = wxGetApp().is_editor() ?
        wxGetApp().plater()->model().custom_gcode_per_print_z.gcodes : m_gcode_result->custom_gcode_per_print_z;
    std::vector<std::string> color_print_colors;
    if (!color_print_values.empty()) {
        color_print_colors = wxGetApp().plater()->get_color_strings_for_color_print(m_gcode_result);
        color_print_colors.push_back("#808080"); // gray color for pause print or custom G-code 
    }

    std::vector<double> zs;

    if (IsShown()) {
        m_canvas->set_selected_extruder(0);
        if (gcode_preview_data_valid) {
            // Load the real G-code preview.
            m_canvas->load_gcode_preview(*m_gcode_result, tool_colors, color_print_colors);
            // the view type may have been changed by the call m_canvas->load_gcode_preview()
            gcode_view_type = m_canvas->get_gcode_view_type();
            zs = m_canvas->get_gcode_layers_zs();
            m_loaded = true;
        }
        else if (is_pregcode_preview) {
            // Load the initial preview based on slices, not the final G-code.
            m_canvas->load_preview(tool_colors, color_print_colors, color_print_values);
            // the view type has been changed by the call m_canvas->load_gcode_preview()
            if (gcode_view_type == libvgcode::EViewType::ColorPrint && !color_print_values.empty())
                m_canvas->set_gcode_view_type(gcode_view_type);
            zs = m_canvas->get_gcode_layers_zs();
        }
        m_moves_slider->Show(gcode_preview_data_valid && !zs.empty());

        if (!zs.empty() && !m_keep_current_preview_type) {
            const unsigned int number_extruders = wxGetApp().is_editor() ?
                (unsigned int)print->extruders().size() : m_canvas->get_gcode_extruders_count();
            const bool contains_color_gcodes = std::any_of(std::begin(color_print_values), std::end(color_print_values),
                [](auto const& item) { return item.type == CustomGCode::Type::ColorChange || item.type == CustomGCode::Type::ToolChange; });
            const libvgcode::EViewType choice = contains_color_gcodes ?
                libvgcode::EViewType::ColorPrint :
                (number_extruders > 1) ? libvgcode::EViewType::Tool : libvgcode::EViewType::FeatureType;
            if (choice != gcode_view_type) {
                const bool gcode_view_type_cache_load = m_canvas->is_gcode_view_type_cache_load_enabled();
                if (gcode_view_type_cache_load)
                    m_canvas->enable_gcode_view_type_cache_load(false);
                m_canvas->set_gcode_view_type(choice);
                if (gcode_view_type_cache_load)
                    m_canvas->enable_gcode_view_type_cache_load(true);
                if (wxGetApp().is_gcode_viewer())
                    m_keep_current_preview_type = true;
            }
        }

        if (zs.empty()) {
            // all layers filtered out
            hide_layers_slider();
            m_canvas_widget->Refresh();
        }
        else
            update_layers_slider(zs, keep_z_range);
    }
}

void Preview::load_print_as_sla()
{
    if (m_loaded || (m_process->current_printer_technology() != ptSLA))
        return;

    unsigned int n_layers = 0;
    const SLAPrint* print = m_process->sla_print();

    std::vector<double> zs;
    double initial_layer_height = print->material_config().initial_layer_height.value;
    for (const SLAPrintObject* obj : print->objects())
        if (obj->is_step_done(slaposSliceSupports) && !obj->get_slice_index().empty()) {
            auto low_coord = obj->get_slice_index().front().print_level();
            for (auto& rec : obj->get_slice_index())
                zs.emplace_back(initial_layer_height + (rec.print_level() - low_coord) * SCALING_FACTOR);
        }
    sort_remove_duplicates(zs);

    m_canvas->reset_clipping_planes_cache();
    m_canvas->set_use_clipping_planes(true);

    n_layers = (unsigned int)zs.size();
    if (n_layers == 0) {
        hide_layers_slider();
        m_canvas_widget->Refresh();
    }

    if (IsShown()) {
        m_canvas->load_sla_preview();
        m_moves_slider->Hide();

        if (n_layers > 0)
            update_layers_slider(zs);

        m_loaded = true;
    }
}

void Preview::on_layers_slider_scroll_changed()
{
    if (IsShown()) {
        PrinterTechnology tech = m_process->current_printer_technology();
        if (tech == ptFFF) {
            m_canvas->set_volumes_z_range({ m_layers_slider->GetLowerValue(), m_layers_slider->GetHigherValue() });
            m_canvas->set_toolpaths_z_range({ static_cast<unsigned int>(m_layers_slider->GetLowerPos()), static_cast<unsigned int>(m_layers_slider->GetHigherPos()) });
            m_canvas->set_as_dirty();
        }
        else if (tech == ptSLA) {
            m_canvas->set_clipping_plane(0, ClippingPlane(Vec3d::UnitZ(), -m_layers_slider->GetLowerValue()));
            m_canvas->set_clipping_plane(1, ClippingPlane(-Vec3d::UnitZ(), m_layers_slider->GetHigherValue()));
            m_canvas->set_layer_slider_index(m_layers_slider->GetHigherPos());
            m_canvas->render();
        }
    }
}

void Preview::on_moves_slider_scroll_changed()
{
    m_canvas->update_gcode_sequential_view_current(static_cast<unsigned int>(m_moves_slider->GetLowerValue() - 1), static_cast<unsigned int>(m_moves_slider->GetHigherValue() - 1));
    m_canvas->set_as_dirty();
    m_canvas->request_extra_frame();
}

} // namespace GUI
} // namespace Slic3r