/*************************************************************************/
/*  navigation_obstacle_2d.cpp                                           */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#include "navigation_obstacle_2d.h"

#include "scene/2d/collision_shape_2d.h"
#include "servers/navigation_server_2d.h"

void NavigationObstacle2D::_bind_methods() {
}

void NavigationObstacle2D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_READY: {
			set_physics_process_internal(true);
		} break;
		case NOTIFICATION_EXIT_TREE: {
			set_physics_process_internal(false);
		} break;
		case NOTIFICATION_PARENTED: {
			parent_node2d = Object::cast_to<Node2D>(get_parent());
			update_agent_shape();
		} break;
		case NOTIFICATION_UNPARENTED: {
			parent_node2d = nullptr;
		} break;
		case NOTIFICATION_INTERNAL_PHYSICS_PROCESS: {
			if (parent_node2d) {
				NavigationServer2D::get_singleton()->agent_set_position(agent, parent_node2d->get_global_transform().get_origin());
			}
		} break;
	}
}

NavigationObstacle2D::NavigationObstacle2D() {
	agent = NavigationServer2D::get_singleton()->agent_create();
}

NavigationObstacle2D::~NavigationObstacle2D() {
	NavigationServer2D::get_singleton()->free(agent);
	agent = RID(); // Pointless
}

TypedArray<String> NavigationObstacle2D::get_configuration_warnings() const {
	TypedArray<String> warnings = Node::get_configuration_warnings();

	if (!Object::cast_to<Node2D>(get_parent())) {
		warnings.push_back(TTR("The NavigationObstacle2D only serves to provide collision avoidance to a Node2D object."));
	}

	return warnings;
}

void NavigationObstacle2D::update_agent_shape() {
	if (parent_node2d) {
		// Estimate the radius of this physics body
		real_t radius = 0.0;
		for (int i(0); i < parent_node2d->get_child_count(); i++) {
			// For each collision shape
			CollisionShape2D *cs = Object::cast_to<CollisionShape2D>(parent_node2d->get_child(i));
			if (cs) {
				// Take the distance between the Body center to the shape center
				real_t r = cs->get_transform().get_origin().length();
				if (cs->get_shape().is_valid()) {
					// and add the enclosing shape radius
					r += cs->get_shape()->get_enclosing_radius();
				}
				Size2 s = cs->get_global_transform().get_scale();
				r *= MAX(s.x, s.y);
				// Takes the biggest radius
				radius = MAX(radius, r);
			}
		}
		Vector2 s = parent_node2d->get_global_transform().get_scale();
		radius *= MAX(s.x, s.y);

		if (radius == 0.0) {
			radius = 1.0; // Never a 0 radius
		}

		// Initialize the Agent as an object
		NavigationServer2D::get_singleton()->agent_set_neighbor_dist(agent, 0.0);
		NavigationServer2D::get_singleton()->agent_set_max_neighbors(agent, 0);
		NavigationServer2D::get_singleton()->agent_set_time_horizon(agent, 0.0);
		NavigationServer2D::get_singleton()->agent_set_radius(agent, radius);
		NavigationServer2D::get_singleton()->agent_set_max_speed(agent, 0.0);
	}
}