/*
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
*/

#pragma once

#include "uilayer.h"

// component implementing specific mode of application behaviour
// base interface
class application_mode {

public:
// destructor
    virtual ~application_mode() = default;
// methods;
    // initializes internal data structures of the mode. returns: true on success, false otherwise
    virtual bool init() = 0;
    // mode-specific update of simulation data. returns: false on error, true otherwise
    virtual bool update() = 0;
	// draws mode-specific user interface
    inline
    void render_ui() {
            if( m_userinterface != nullptr ) {
                m_userinterface->render(); } }
	inline
	void begin_ui_frame() {
		    if( m_userinterface != nullptr ) {
				m_userinterface->begin_ui_frame(); } }
    inline
    void set_progress( float const Progress = 0.f, float const Subtaskprogress = 0.f ) {
            if( m_userinterface != nullptr ) {
                m_userinterface->set_progress( Progress, Subtaskprogress ); } }
    inline
    void set_tooltip( std::string const &Tooltip ) {
            if( m_userinterface != nullptr ) {
                m_userinterface->set_tooltip( Tooltip ); } }
    // maintenance method, called when the mode is activated
    virtual void enter() = 0;
    // maintenance method, called when the mode is deactivated
    virtual void exit() = 0;
    // input handlers
    virtual void on_key( int Key, int Scancode, int Action, int Mods ) = 0;
    virtual void on_cursor_pos( double X, double Y ) = 0;
    virtual void on_mouse_button( int Button, int Action, int Mods ) = 0;
    virtual void on_scroll( double Xoffset, double Yoffset ) = 0;
    virtual void on_window_resize( int w, int h ) = 0;
    virtual void on_event_poll() = 0;
    virtual bool is_command_processor() const = 0;

protected:
// members
    std::shared_ptr<ui_layer> m_userinterface;
};