/**************************************************************************/
/*  navigation_mesh_source_geometry_data_3d.cpp                           */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "navigation_mesh_source_geometry_data_3d.h"

void NavigationMeshSourceGeometryData3D::set_vertices(const Vector<float> &p_vertices) {
	vertices = p_vertices;
}

void NavigationMeshSourceGeometryData3D::set_indices(const Vector<int> &p_indices) {
	indices = p_indices;
}

void NavigationMeshSourceGeometryData3D::clear() {
	vertices.clear();
	indices.clear();
	clear_projected_obstructions();
}

void NavigationMeshSourceGeometryData3D::clear_projected_obstructions() {
	RWLockWrite write_lock(geometry_rwlock);
	_projected_obstructions.clear();
}

void NavigationMeshSourceGeometryData3D::_add_vertex(const Vector3 &p_vec3) {
	vertices.push_back(p_vec3.x);
	vertices.push_back(p_vec3.y);
	vertices.push_back(p_vec3.z);
}

void NavigationMeshSourceGeometryData3D::_add_mesh(const Ref<Mesh> &p_mesh, const Transform3D &p_xform) {
	int current_vertex_count;
	for (int i = 0; i < p_mesh->get_surface_count(); i++) {
		current_vertex_count = vertices.size() / 3;

		if (p_mesh->surface_get_primitive_type(i) != Mesh::PRIMITIVE_TRIANGLES) {
			continue;
		}

		int index_count = 0;
		if (p_mesh->surface_get_format(i) & Mesh::ARRAY_FORMAT_INDEX) {
			index_count = p_mesh->surface_get_array_index_len(i);
		} else {
			index_count = p_mesh->surface_get_array_len(i);
		}

		ERR_CONTINUE((index_count == 0 || (index_count % 3) != 0));

		int face_count = index_count / 3;

		Array a = p_mesh->surface_get_arrays(i);
		ERR_CONTINUE(a.is_empty() || (a.size() != Mesh::ARRAY_MAX));

		Vector<Vector3> mesh_vertices = a[Mesh::ARRAY_VERTEX];
		ERR_CONTINUE(mesh_vertices.is_empty());
		const Vector3 *vr = mesh_vertices.ptr();

		if (p_mesh->surface_get_format(i) & Mesh::ARRAY_FORMAT_INDEX) {
			Vector<int> mesh_indices = a[Mesh::ARRAY_INDEX];
			ERR_CONTINUE(mesh_indices.is_empty() || (mesh_indices.size() != index_count));
			const int *ir = mesh_indices.ptr();

			for (int j = 0; j < mesh_vertices.size(); j++) {
				_add_vertex(p_xform.xform(vr[j]));
			}

			for (int j = 0; j < face_count; j++) {
				// CCW
				indices.push_back(current_vertex_count + (ir[j * 3 + 0]));
				indices.push_back(current_vertex_count + (ir[j * 3 + 2]));
				indices.push_back(current_vertex_count + (ir[j * 3 + 1]));
			}
		} else {
			ERR_CONTINUE(mesh_vertices.size() != index_count);
			face_count = mesh_vertices.size() / 3;
			for (int j = 0; j < face_count; j++) {
				_add_vertex(p_xform.xform(vr[j * 3 + 0]));
				_add_vertex(p_xform.xform(vr[j * 3 + 2]));
				_add_vertex(p_xform.xform(vr[j * 3 + 1]));

				indices.push_back(current_vertex_count + (j * 3 + 0));
				indices.push_back(current_vertex_count + (j * 3 + 1));
				indices.push_back(current_vertex_count + (j * 3 + 2));
			}
		}
	}
}

void NavigationMeshSourceGeometryData3D::_add_mesh_array(const Array &p_mesh_array, const Transform3D &p_xform) {
	ERR_FAIL_COND(p_mesh_array.size() != Mesh::ARRAY_MAX);

	Vector<Vector3> mesh_vertices = p_mesh_array[Mesh::ARRAY_VERTEX];
	ERR_FAIL_COND(mesh_vertices.is_empty());
	const Vector3 *vr = mesh_vertices.ptr();

	Vector<int> mesh_indices = p_mesh_array[Mesh::ARRAY_INDEX];
	ERR_FAIL_COND(mesh_indices.is_empty());
	const int *ir = mesh_indices.ptr();

	const int face_count = mesh_indices.size() / 3;
	const int current_vertex_count = vertices.size() / 3;

	for (int j = 0; j < mesh_vertices.size(); j++) {
		_add_vertex(p_xform.xform(vr[j]));
	}

	for (int j = 0; j < face_count; j++) {
		// CCW
		indices.push_back(current_vertex_count + (ir[j * 3 + 0]));
		indices.push_back(current_vertex_count + (ir[j * 3 + 2]));
		indices.push_back(current_vertex_count + (ir[j * 3 + 1]));
	}
}

void NavigationMeshSourceGeometryData3D::_add_faces(const PackedVector3Array &p_faces, const Transform3D &p_xform) {
	ERR_FAIL_COND(p_faces.is_empty());
	ERR_FAIL_COND(p_faces.size() % 3 != 0);
	int face_count = p_faces.size() / 3;
	int current_vertex_count = vertices.size() / 3;

	for (int j = 0; j < face_count; j++) {
		_add_vertex(p_xform.xform(p_faces[j * 3 + 0]));
		_add_vertex(p_xform.xform(p_faces[j * 3 + 1]));
		_add_vertex(p_xform.xform(p_faces[j * 3 + 2]));

		indices.push_back(current_vertex_count + (j * 3 + 0));
		indices.push_back(current_vertex_count + (j * 3 + 2));
		indices.push_back(current_vertex_count + (j * 3 + 1));
	}
}

void NavigationMeshSourceGeometryData3D::add_mesh(const Ref<Mesh> &p_mesh, const Transform3D &p_xform) {
	ERR_FAIL_COND(!p_mesh.is_valid());

#ifdef DEBUG_ENABLED
	if (!Engine::get_singleton()->is_editor_hint()) {
		WARN_PRINT_ONCE("Source geometry parsing for navigation mesh baking had to parse RenderingServer meshes at runtime.\n\
		This poses a significant performance issues as visual meshes store geometry data on the GPU and transferring this data back to the CPU blocks the rendering.\n\
		For runtime (re)baking navigation meshes use and parse collision shapes as source geometry or create geometry data procedurally in scripts.");
	}
#endif

	_add_mesh(p_mesh, root_node_transform * p_xform);
}

void NavigationMeshSourceGeometryData3D::add_mesh_array(const Array &p_mesh_array, const Transform3D &p_xform) {
	ERR_FAIL_COND(p_mesh_array.size() != Mesh::ARRAY_MAX);
	_add_mesh_array(p_mesh_array, root_node_transform * p_xform);
}

void NavigationMeshSourceGeometryData3D::add_faces(const PackedVector3Array &p_faces, const Transform3D &p_xform) {
	ERR_FAIL_COND(p_faces.size() % 3 != 0);
	_add_faces(p_faces, root_node_transform * p_xform);
}

void NavigationMeshSourceGeometryData3D::merge(const Ref<NavigationMeshSourceGeometryData3D> &p_other_geometry) {
	ERR_FAIL_NULL(p_other_geometry);

	// No need to worry about `root_node_transform` here as the vertices are already xformed.
	const int64_t number_of_vertices_before_merge = vertices.size();
	const int64_t number_of_indices_before_merge = indices.size();
	vertices.append_array(p_other_geometry->vertices);
	indices.append_array(p_other_geometry->indices);
	for (int64_t i = number_of_indices_before_merge; i < indices.size(); i++) {
		indices.set(i, indices[i] + number_of_vertices_before_merge / 3);
	}

	if (p_other_geometry->_projected_obstructions.size() > 0) {
		RWLockWrite write_lock(geometry_rwlock);

		for (const ProjectedObstruction &other_projected_obstruction : p_other_geometry->_projected_obstructions) {
			ProjectedObstruction projected_obstruction;
			projected_obstruction.vertices.resize(other_projected_obstruction.vertices.size());

			const float *other_obstruction_vertices_ptr = other_projected_obstruction.vertices.ptr();
			float *obstruction_vertices_ptrw = projected_obstruction.vertices.ptrw();

			for (int j = 0; j < other_projected_obstruction.vertices.size(); j++) {
				obstruction_vertices_ptrw[j] = other_obstruction_vertices_ptr[j];
			}

			projected_obstruction.elevation = other_projected_obstruction.elevation;
			projected_obstruction.height = other_projected_obstruction.height;
			projected_obstruction.carve = other_projected_obstruction.carve;

			_projected_obstructions.push_back(projected_obstruction);
		}
	}
}

void NavigationMeshSourceGeometryData3D::add_projected_obstruction(const Vector<Vector3> &p_vertices, float p_elevation, float p_height, bool p_carve) {
	ERR_FAIL_COND(p_vertices.size() < 3);
	ERR_FAIL_COND(p_height < 0.0);

	ProjectedObstruction projected_obstruction;
	projected_obstruction.vertices.resize(p_vertices.size() * 3);
	projected_obstruction.elevation = p_elevation;
	projected_obstruction.height = p_height;
	projected_obstruction.carve = p_carve;

	float *obstruction_vertices_ptrw = projected_obstruction.vertices.ptrw();

	int vertex_index = 0;
	for (const Vector3 &vertex : p_vertices) {
		obstruction_vertices_ptrw[vertex_index++] = vertex.x;
		obstruction_vertices_ptrw[vertex_index++] = vertex.y;
		obstruction_vertices_ptrw[vertex_index++] = vertex.z;
	}

	RWLockWrite write_lock(geometry_rwlock);
	_projected_obstructions.push_back(projected_obstruction);
}

void NavigationMeshSourceGeometryData3D::set_projected_obstructions(const Array &p_array) {
	clear_projected_obstructions();

	for (int i = 0; i < p_array.size(); i++) {
		Dictionary data = p_array[i];
		ERR_FAIL_COND(!data.has("version"));

		uint32_t po_version = data["version"];

		if (po_version == 1) {
			ERR_FAIL_COND(!data.has("vertices"));
			ERR_FAIL_COND(!data.has("elevation"));
			ERR_FAIL_COND(!data.has("height"));
			ERR_FAIL_COND(!data.has("carve"));
		}

		ProjectedObstruction projected_obstruction;
		projected_obstruction.vertices = Vector<float>(data["vertices"]);
		projected_obstruction.elevation = data["elevation"];
		projected_obstruction.height = data["height"];
		projected_obstruction.carve = data["carve"];

		RWLockWrite write_lock(geometry_rwlock);
		_projected_obstructions.push_back(projected_obstruction);
	}
}

Vector<NavigationMeshSourceGeometryData3D::ProjectedObstruction> NavigationMeshSourceGeometryData3D::_get_projected_obstructions() const {
	RWLockRead read_lock(geometry_rwlock);
	return _projected_obstructions;
}

Array NavigationMeshSourceGeometryData3D::get_projected_obstructions() const {
	RWLockRead read_lock(geometry_rwlock);

	Array ret;
	ret.resize(_projected_obstructions.size());

	for (int i = 0; i < _projected_obstructions.size(); i++) {
		const ProjectedObstruction &projected_obstruction = _projected_obstructions[i];

		Dictionary data;
		data["version"] = (int)ProjectedObstruction::VERSION;
		data["vertices"] = projected_obstruction.vertices;
		data["elevation"] = projected_obstruction.elevation;
		data["height"] = projected_obstruction.height;
		data["carve"] = projected_obstruction.carve;

		ret[i] = data;
	}

	return ret;
}

bool NavigationMeshSourceGeometryData3D::_set(const StringName &p_name, const Variant &p_value) {
	if (p_name == "projected_obstructions") {
		set_projected_obstructions(p_value);
		return true;
	}
	return false;
}

bool NavigationMeshSourceGeometryData3D::_get(const StringName &p_name, Variant &r_ret) const {
	if (p_name == "projected_obstructions") {
		r_ret = get_projected_obstructions();
		return true;
	}
	return false;
}

void NavigationMeshSourceGeometryData3D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_vertices", "vertices"), &NavigationMeshSourceGeometryData3D::set_vertices);
	ClassDB::bind_method(D_METHOD("get_vertices"), &NavigationMeshSourceGeometryData3D::get_vertices);

	ClassDB::bind_method(D_METHOD("set_indices", "indices"), &NavigationMeshSourceGeometryData3D::set_indices);
	ClassDB::bind_method(D_METHOD("get_indices"), &NavigationMeshSourceGeometryData3D::get_indices);

	ClassDB::bind_method(D_METHOD("clear"), &NavigationMeshSourceGeometryData3D::clear);
	ClassDB::bind_method(D_METHOD("has_data"), &NavigationMeshSourceGeometryData3D::has_data);

	ClassDB::bind_method(D_METHOD("add_mesh", "mesh", "xform"), &NavigationMeshSourceGeometryData3D::add_mesh);
	ClassDB::bind_method(D_METHOD("add_mesh_array", "mesh_array", "xform"), &NavigationMeshSourceGeometryData3D::add_mesh_array);
	ClassDB::bind_method(D_METHOD("add_faces", "faces", "xform"), &NavigationMeshSourceGeometryData3D::add_faces);
	ClassDB::bind_method(D_METHOD("merge", "other_geometry"), &NavigationMeshSourceGeometryData3D::merge);

	ClassDB::bind_method(D_METHOD("add_projected_obstruction", "vertices", "elevation", "height", "carve"), &NavigationMeshSourceGeometryData3D::add_projected_obstruction);
	ClassDB::bind_method(D_METHOD("clear_projected_obstructions"), &NavigationMeshSourceGeometryData3D::clear_projected_obstructions);
	ClassDB::bind_method(D_METHOD("set_projected_obstructions", "projected_obstructions"), &NavigationMeshSourceGeometryData3D::set_projected_obstructions);
	ClassDB::bind_method(D_METHOD("get_projected_obstructions"), &NavigationMeshSourceGeometryData3D::get_projected_obstructions);

	ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR3_ARRAY, "vertices", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "set_vertices", "get_vertices");
	ADD_PROPERTY(PropertyInfo(Variant::PACKED_INT32_ARRAY, "indices", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "set_indices", "get_indices");
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "projected_obstructions", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "set_projected_obstructions", "get_projected_obstructions");
}