/*************************************************************************/
/*  navigation_link_2d_editor_plugin.cpp                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/

#include "navigation_link_2d_editor_plugin.h"

#include "canvas_item_editor_plugin.h"
#include "editor/editor_node.h"
#include "editor/editor_settings.h"
#include "editor/editor_undo_redo_manager.h"
#include "servers/navigation_server_3d.h"

void NavigationLink2DEditor::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			get_tree()->connect("node_removed", callable_mp(this, &NavigationLink2DEditor::_node_removed));
		} break;

		case NOTIFICATION_EXIT_TREE: {
			get_tree()->disconnect("node_removed", callable_mp(this, &NavigationLink2DEditor::_node_removed));
		} break;
	}
}

void NavigationLink2DEditor::_node_removed(Node *p_node) {
	if (p_node == node) {
		node = nullptr;
	}
}

bool NavigationLink2DEditor::forward_canvas_gui_input(const Ref<InputEvent> &p_event) {
	if (!node || !node->is_visible_in_tree()) {
		return false;
	}

	real_t grab_threshold = EDITOR_GET("editors/polygon_editor/point_grab_radius");
	Transform2D xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();

	Ref<InputEventMouseButton> mb = p_event;
	if (mb.is_valid() && mb->get_button_index() == MouseButton::LEFT) {
		if (mb->is_pressed()) {
			// Start location
			if (xform.xform(node->get_start_location()).distance_to(mb->get_position()) < grab_threshold) {
				start_grabbed = true;
				original_start_location = node->get_start_location();

				return true;
			} else {
				start_grabbed = false;
			}

			// End location
			if (xform.xform(node->get_end_location()).distance_to(mb->get_position()) < grab_threshold) {
				end_grabbed = true;
				original_end_location = node->get_end_location();

				return true;
			} else {
				end_grabbed = false;
			}
		} else {
			if (start_grabbed) {
				undo_redo->create_action(TTR("Set start_location"));
				undo_redo->add_do_method(node, "set_start_location", node->get_start_location());
				undo_redo->add_do_method(canvas_item_editor, "update_viewport");
				undo_redo->add_undo_method(node, "set_start_location", original_start_location);
				undo_redo->add_undo_method(canvas_item_editor, "update_viewport");
				undo_redo->commit_action();

				start_grabbed = false;

				return true;
			}

			if (end_grabbed) {
				undo_redo->create_action(TTR("Set end_location"));
				undo_redo->add_do_method(node, "set_end_location", node->get_end_location());
				undo_redo->add_do_method(canvas_item_editor, "update_viewport");
				undo_redo->add_undo_method(node, "set_end_location", original_end_location);
				undo_redo->add_undo_method(canvas_item_editor, "update_viewport");
				undo_redo->commit_action();

				end_grabbed = false;

				return true;
			}
		}
	}

	Ref<InputEventMouseMotion> mm = p_event;
	if (mm.is_valid()) {
		Vector2 point = canvas_item_editor->snap_point(canvas_item_editor->get_canvas_transform().affine_inverse().xform(mm->get_position()));
		point = node->get_global_transform().affine_inverse().xform(point);

		if (start_grabbed) {
			node->set_start_location(point);
			canvas_item_editor->update_viewport();

			return true;
		}

		if (end_grabbed) {
			node->set_end_location(point);
			canvas_item_editor->update_viewport();

			return true;
		}
	}

	return false;
}

void NavigationLink2DEditor::forward_canvas_draw_over_viewport(Control *p_overlay) {
	if (!node || !node->is_visible_in_tree()) {
		return;
	}

	Transform2D gt = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
	Vector2 global_start_location = gt.xform(node->get_start_location());
	Vector2 global_end_location = gt.xform(node->get_end_location());

	// Only drawing the handles here, since the debug rendering will fill in the rest.
	const Ref<Texture2D> handle = get_theme_icon(SNAME("EditorHandle"), SNAME("EditorIcons"));
	p_overlay->draw_texture(handle, global_start_location - handle->get_size() / 2);
	p_overlay->draw_texture(handle, global_end_location - handle->get_size() / 2);
}

void NavigationLink2DEditor::edit(NavigationLink2D *p_node) {
	if (!canvas_item_editor) {
		canvas_item_editor = CanvasItemEditor::get_singleton();
	}

	if (p_node) {
		node = p_node;
	} else {
		node = nullptr;
	}

	canvas_item_editor->update_viewport();
}

NavigationLink2DEditor::NavigationLink2DEditor() {
	undo_redo = EditorNode::get_undo_redo();
}

///////////////////////

void NavigationLink2DEditorPlugin::edit(Object *p_object) {
	editor->edit(Object::cast_to<NavigationLink2D>(p_object));
}

bool NavigationLink2DEditorPlugin::handles(Object *p_object) const {
	return Object::cast_to<NavigationLink2D>(p_object) != nullptr;
}

void NavigationLink2DEditorPlugin::make_visible(bool p_visible) {
	if (!p_visible) {
		edit(nullptr);
	}
}

NavigationLink2DEditorPlugin::NavigationLink2DEditorPlugin() {
	editor = memnew(NavigationLink2DEditor);
	EditorNode::get_singleton()->get_gui_base()->add_child(editor);
}