/* === S Y N F I G ========================================================= */
/*!	\file widgets/widget_timetrack.h
**	\brief Widget to displaying layer parameter waypoints along time
**
**	$Id$
**
**	\legal
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	......... ... 2020 Rodolfo Ribeiro Gomes
**
**	This package 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 2 of
**	the License, or (at your option) any later version.
**
**	This package 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.
**	\endlegal
*/

#ifndef SYNFIG_STUDIO_WIDGET_TIMETRACK_H
#define SYNFIG_STUDIO_WIDGET_TIMETRACK_H

#include <gtkmm/treeview.h>

#include <gui/canvasview.h>
#include <gui/selectdraghelper.h>
#include <gui/widgets/widget_timegraphbase.h>

namespace studio {

class LayerParamTreeStore;

/**
 * \brief The Widget_Timetrack class to displaying layer parameter waypoints along time
 *
 * This widget is vertically synchronized with a Gtk::TreeView that uses
 * LayerParamTreeStore as its model: it mimics its height and vertical scrolling.
 *
 * The minimum setup requires three info:
 *
 * \code{.cpp}
 * Widget_Timetrack widget_timetrack;
 * widget_timetrack.set_time_model(canvas_view->time_model());
 * widget_timetrack.set_canvas_interface(canvas_view->canvas_interface());
 * // layer_param_treeview is a Gtk::TreeView with LayerParamTreeStore as model
 * widget_timetrack.set_params_view(layer_param_treeview);
 * \endcode
 *
 * Alternatively, if everything follows the Synfig Studio convention (ie. docks
 * and models names), a helper method can be used instead:
 * \code{.cpp}
 * Widget_Timetrack widget_timetrack;
 * widget_timetrack.use_canvas_view(canvas_view);
 * \endcode
 */
class Widget_Timetrack : public Widget_TimeGraphBase
{
public:
	Widget_Timetrack();
	virtual ~Widget_Timetrack() override;

	bool set_params_view(Gtk::TreeView *treeview);
	Gtk::TreeView * get_params_view() const;
	Glib::RefPtr<LayerParamTreeStore> get_params_model() const;

	bool use_canvas_view(etl::loose_handle<CanvasView> canvas_view);

	void delete_selected();
	bool move_selected(synfig::Time delta_time);
	//! Duplicate selected waypoints and move them delta_time
	bool copy_selected(synfig::Time delta_time);
	//! Scale selected waypoints based on current time
	void scale_selected();
	//! \param n : how many waypoints to skip
	void goto_next_waypoint(long n);
	//! \param n : how many waypoints to skip back
	void goto_previous_waypoint(long n);

	sigc::signal<void, synfigapp::ValueDesc, std::set<synfig::Waypoint,std::less<synfig::UniqueID> >, int>& signal_waypoint_clicked() { return signal_waypoint_clicked_; }
	sigc::signal<void, synfigapp::ValueDesc, std::set<synfig::Waypoint,std::less<synfig::UniqueID> >, int>& signal_waypoint_double_clicked() { return signal_waypoint_double_clicked_; }

	enum ActionState {
		NONE,
		MOVE,
		COPY,
		SCALE
	};
	static std::string get_action_state_name(ActionState action_state);
	ActionState get_action_state() const;
	void set_action_state(ActionState action_state);
	sigc::signal<void>& signal_action_state_changed() { return signal_action_state_changed_; }

protected:
	virtual bool on_event(GdkEvent* event) override;
	virtual bool on_draw(const Cairo::RefPtr<Cairo::Context> &cr) override;
	virtual void on_size_allocate(Gtk::Allocation &allocation) override;

	virtual void on_canvas_interface_changed() override;
private:
	void displace_selected_waypoint_items(const synfig::Time &offset);

	void update_cursor();

	struct WaypointItem {
		synfig::TimePoint time_point;
		Gtk::TreePath path;

		WaypointItem() {}
		WaypointItem(const synfig::TimePoint time_point, const Gtk::TreePath &path);

		bool is_draggable() const;

		bool operator ==(const WaypointItem &b) const;
		bool operator !=(const WaypointItem &b) const {return !operator==(b);}
	};

	//! Handle mouse actions for panning/zooming/scrolling and waypoint selection
	struct WaypointSD : SelectDragHelper<WaypointItem>
	{
	protected:
		Widget_Timetrack &widget;
		ActionState action;

	public:
		WaypointSD(Widget_Timetrack &widget);
		virtual ~WaypointSD() override;
		virtual void get_item_position(const WaypointItem& item, Gdk::Point& p) override;
		virtual bool find_item_at_position(int pos_x, int pos_y, WaypointItem& item) override;
		virtual bool find_items_in_rect(Gdk::Rectangle rect, std::vector<WaypointItem>&list) override;
		virtual void get_all_items(std::vector<WaypointItem>&) override {}
		virtual void delta_drag(int total_dx, int total_dy, bool by_keys) override;

		const synfig::Time& get_deltatime() const;
		ActionState get_action() const;
		void set_action(ActionState action_state);
		sigc::signal<void>& signal_action_changed();
	protected:
		synfig::Time deltatime;
		bool is_action_set_before_drag;

		void on_drag_started();
		void on_drag_canceled();
		void on_drag_finish(bool started_by_keys);

		void on_modifier_keys_changed();

		void update_action();
		sigc::signal<void> signal_action_changed_;
	} waypoint_sd;
	void setup_mouse_handler();

	//! the treeview to synch with
	Gtk::TreeView *params_treeview;
	Glib::RefPtr<LayerParamTreeStore> params_store;

	std::vector<sigc::connection> treeview_connections;
	std::vector<sigc::connection> treestore_connections;

	void setup_params_store();
	void teardown_params_store();
	void setup_params_view();
	void teardown_params_view();
	void setup_adjustment();

	struct Geometry {
		int y;
		int h;
	};

	/// Tracks a parameter item : its value and its y-position and height in parameters list view
	struct RowInfo {
		RowInfo();
		RowInfo(synfigapp::ValueDesc value_desc, Geometry geometry);
		~RowInfo();

		sigc::signal<void> signal_changed() {return signal_changed_;}

		const synfigapp::ValueDesc& get_value_desc() const;

		Geometry get_geometry() const;
		void set_geometry(const Geometry& value);

		void recheck_for_value_nodes();

		bool is_valid() const;

	protected:
		synfigapp::ValueDesc value_desc;
		Geometry geometry;
		sigc::signal<void> signal_changed_;

		void refresh();
	private:
		sigc::connection value_node_connection;
		sigc::connection parent_value_node_connection;
		void clear_connections();
	};

	std::map<std::string, RowInfo> param_info_map;
	int param_list_height;

	std::mutex param_list_mutex;
	bool is_rebuild_param_info_list_queued;
	void queue_rebuild_param_info_list();
	void rebuild_param_info_list();
	bool is_update_param_list_geometries_queued;
	void queue_update_param_list_geometries();
	void update_param_list_geometries();

	void draw_static_intervals_for_row(const Cairo::RefPtr<Cairo::Context> &cr, const RowInfo &row_info, const std::vector<std::pair<synfig::TimePoint, synfig::Time>> &waypoints) const;
	void draw_waypoints(const Cairo::RefPtr<Cairo::Context> &cr, const Gtk::TreePath &path, const RowInfo &row_info, const std::vector<std::pair<synfig::TimePoint, synfig::Time>> &waypoints) const;
	void draw_selected_background(const Cairo::RefPtr<Cairo::Context> &cr, const Gtk::TreePath &path, const RowInfo &row_info) const;

	bool fetch_waypoints(const WaypointItem &wi, std::set<synfig::Waypoint, std::less<synfig::UniqueID> > &waypoint_set) const;
	void on_waypoint_clicked(const WaypointItem &wi, unsigned int button, Gdk::Point /*point*/);
	void on_waypoint_double_clicked(const WaypointItem &wi, unsigned int button, Gdk::Point /*point*/);

	sigc::signal<void, synfigapp::ValueDesc, std::set<synfig::Waypoint,std::less<synfig::UniqueID> >, int> signal_waypoint_clicked_;
	sigc::signal<void, synfigapp::ValueDesc, std::set<synfig::Waypoint,std::less<synfig::UniqueID> >, int> signal_waypoint_double_clicked_;

	sigc::signal<void> signal_action_state_changed_;

	ActionState action_state;

	struct WaypointScaleInfo {
		double scale;
		double ref_time;
		double base_offset;
	};

	WaypointScaleInfo compute_scale_params() const;
	synfig::Time compute_scaled_time(const WaypointItem &item, const WaypointScaleInfo &scale_info) const;
	sigc::connection keyframe_changed_connection_;
};

}

#endif // SYNFIG_STUDIO_WIDGET_TIMETRACK_H
