/*************************************************************************/
/*  mesh_data_tool.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).   */
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/* 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 "mesh_data_tool.h"

void MeshDataTool::clear() {
	vertices.clear();
	edges.clear();
	faces.clear();
	material = Ref<Material>();
	format = 0;
}

Error MeshDataTool::create_from_surface(const Ref<ArrayMesh> &p_mesh, int p_surface) {
	ERR_FAIL_COND_V(p_mesh.is_null(), ERR_INVALID_PARAMETER);
	ERR_FAIL_COND_V(p_mesh->surface_get_primitive_type(p_surface) != Mesh::PRIMITIVE_TRIANGLES, ERR_INVALID_PARAMETER);

	Array arrays = p_mesh->surface_get_arrays(p_surface);
	ERR_FAIL_COND_V(arrays.empty(), ERR_INVALID_PARAMETER);

	PoolVector<Vector3> varray = arrays[Mesh::ARRAY_VERTEX];

	int vcount = varray.size();
	ERR_FAIL_COND_V(vcount == 0, ERR_INVALID_PARAMETER);

	PoolVector<int> indices;

	if (arrays[Mesh::ARRAY_INDEX].get_type() != Variant::NIL) {
		indices = arrays[Mesh::ARRAY_INDEX];
	} else {
		//make code simpler
		indices.resize(vcount);
		PoolVector<int>::Write iw = indices.write();
		for (int i = 0; i < vcount; i++) {
			iw[i] = i;
		}
	}

	int icount = indices.size();
	PoolVector<int>::Read r = indices.read();

	ERR_FAIL_COND_V(icount == 0, ERR_INVALID_PARAMETER);
	ERR_FAIL_COND_V(icount % 3, ERR_INVALID_PARAMETER);
	for (int i = 0; i < icount; i++) {
		ERR_FAIL_INDEX_V(r[i], vcount, ERR_INVALID_PARAMETER);
	}

	clear();
	format = p_mesh->surface_get_format(p_surface);
	material = p_mesh->surface_get_material(p_surface);

	PoolVector<Vector3>::Read vr = varray.read();

	PoolVector<Vector3>::Read nr;
	if (arrays[Mesh::ARRAY_NORMAL].get_type() != Variant::NIL) {
		nr = arrays[Mesh::ARRAY_NORMAL].operator PoolVector<Vector3>().read();
	}

	PoolVector<real_t>::Read ta;
	if (arrays[Mesh::ARRAY_TANGENT].get_type() != Variant::NIL) {
		ta = arrays[Mesh::ARRAY_TANGENT].operator PoolVector<real_t>().read();
	}

	PoolVector<Vector2>::Read uv;
	if (arrays[Mesh::ARRAY_TEX_UV].get_type() != Variant::NIL) {
		uv = arrays[Mesh::ARRAY_TEX_UV].operator PoolVector<Vector2>().read();
	}
	PoolVector<Vector2>::Read uv2;
	if (arrays[Mesh::ARRAY_TEX_UV2].get_type() != Variant::NIL) {
		uv2 = arrays[Mesh::ARRAY_TEX_UV2].operator PoolVector<Vector2>().read();
	}

	PoolVector<Color>::Read col;
	if (arrays[Mesh::ARRAY_COLOR].get_type() != Variant::NIL) {
		col = arrays[Mesh::ARRAY_COLOR].operator PoolVector<Color>().read();
	}

	vertices.resize(vcount);

	for (int i = 0; i < vcount; i++) {
		Vertex v;
		v.vertex = vr[i];
		if (nr.ptr()) {
			v.normal = nr[i];
		}
		if (ta.ptr()) {
			v.tangent = Plane(ta[i * 4 + 0], ta[i * 4 + 1], ta[i * 4 + 2], ta[i * 4 + 3]);
		}
		if (uv.ptr()) {
			v.uv = uv[i];
		}
		if (uv2.ptr()) {
			v.uv2 = uv2[i];
		}
		if (col.ptr()) {
			v.color = col[i];
		}

		vertices.write[i] = v;
	}

	RBMap<Point2i, int> edge_indices;

	for (int i = 0; i < icount; i += 3) {
		Vertex *v[3] = { &vertices.write[r[i + 0]], &vertices.write[r[i + 1]], &vertices.write[r[i + 2]] };

		int fidx = faces.size();
		Face face;

		for (int j = 0; j < 3; j++) {
			face.v[j] = r[i + j];

			Point2i edge(r[i + j], r[i + (j + 1) % 3]);
			if (edge.x > edge.y) {
				SWAP(edge.x, edge.y);
			}

			if (edge_indices.has(edge)) {
				face.edges[j] = edge_indices[edge];

			} else {
				face.edges[j] = edge_indices.size();
				edge_indices[edge] = face.edges[j];
				Edge e;
				e.vertex[0] = edge.x;
				e.vertex[1] = edge.y;
				edges.push_back(e);
				v[j]->edges.push_back(face.edges[j]);
				v[(j + 1) % 3]->edges.push_back(face.edges[j]);
			}

			edges.write[face.edges[j]].faces.push_back(fidx);
			v[j]->faces.push_back(fidx);
		}

		faces.push_back(face);
	}

	return OK;
}

Error MeshDataTool::commit_to_surface(const Ref<ArrayMesh> &p_mesh) {
	ERR_FAIL_COND_V(p_mesh.is_null(), ERR_INVALID_PARAMETER);
	Array arr;
	arr.resize(Mesh::ARRAY_MAX);

	int vcount = vertices.size();

	PoolVector<Vector3> v;
	PoolVector<Vector3> n;
	PoolVector<real_t> t;
	PoolVector<Vector2> u;
	PoolVector<Vector2> u2;
	PoolVector<Color> c;
	PoolVector<int> b;
	PoolVector<real_t> w;
	PoolVector<int> in;

	{
		v.resize(vcount);
		PoolVector<Vector3>::Write vr = v.write();

		PoolVector<Vector3>::Write nr;
		if (format & Mesh::ARRAY_FORMAT_NORMAL) {
			n.resize(vcount);
			nr = n.write();
		}

		PoolVector<real_t>::Write ta;
		if (format & Mesh::ARRAY_FORMAT_TANGENT) {
			t.resize(vcount * 4);
			ta = t.write();
		}

		PoolVector<Vector2>::Write uv;
		if (format & Mesh::ARRAY_FORMAT_TEX_UV) {
			u.resize(vcount);
			uv = u.write();
		}

		PoolVector<Vector2>::Write uv2;
		if (format & Mesh::ARRAY_FORMAT_TEX_UV2) {
			u2.resize(vcount);
			uv2 = u2.write();
		}

		PoolVector<Color>::Write col;
		if (format & Mesh::ARRAY_FORMAT_COLOR) {
			c.resize(vcount);
			col = c.write();
		}

		for (int i = 0; i < vcount; i++) {
			const Vertex &vtx = vertices[i];

			vr[i] = vtx.vertex;
			if (nr.ptr()) {
				nr[i] = vtx.normal;
			}
			if (ta.ptr()) {
				ta[i * 4 + 0] = vtx.tangent.normal.x;
				ta[i * 4 + 1] = vtx.tangent.normal.y;
				ta[i * 4 + 2] = vtx.tangent.normal.z;
				ta[i * 4 + 3] = vtx.tangent.d;
			}
			if (uv.ptr()) {
				uv[i] = vtx.uv;
			}
			if (uv2.ptr()) {
				uv2[i] = vtx.uv2;
			}
			if (col.ptr()) {
				col[i] = vtx.color;
			}
		}

		int fc = faces.size();
		in.resize(fc * 3);
		PoolVector<int>::Write iw = in.write();
		for (int i = 0; i < fc; i++) {
			iw[i * 3 + 0] = faces[i].v[0];
			iw[i * 3 + 1] = faces[i].v[1];
			iw[i * 3 + 2] = faces[i].v[2];
		}
	}

	arr[Mesh::ARRAY_VERTEX] = v;
	arr[Mesh::ARRAY_INDEX] = in;
	if (n.size()) {
		arr[Mesh::ARRAY_NORMAL] = n;
	}
	if (c.size()) {
		arr[Mesh::ARRAY_COLOR] = c;
	}
	if (u.size()) {
		arr[Mesh::ARRAY_TEX_UV] = u;
	}
	if (u2.size()) {
		arr[Mesh::ARRAY_TEX_UV2] = u2;
	}
	if (t.size()) {
		arr[Mesh::ARRAY_TANGENT] = t;
	}

	Ref<ArrayMesh> ncmesh = p_mesh;
	int sc = ncmesh->get_surface_count();
	ncmesh->add_surface_from_arrays(Mesh::PRIMITIVE_TRIANGLES, arr);
	ncmesh->surface_set_material(sc, material);

	return OK;
}

int MeshDataTool::get_format() const {
	return format;
}

int MeshDataTool::get_vertex_count() const {
	return vertices.size();
}
int MeshDataTool::get_edge_count() const {
	return edges.size();
}
int MeshDataTool::get_face_count() const {
	return faces.size();
}

Vector3 MeshDataTool::get_vertex(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Vector3());
	return vertices[p_idx].vertex;
}
void MeshDataTool::set_vertex(int p_idx, const Vector3 &p_vertex) {
	ERR_FAIL_INDEX(p_idx, vertices.size());
	vertices.write[p_idx].vertex = p_vertex;
}

Vector3 MeshDataTool::get_vertex_normal(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Vector3());
	return vertices[p_idx].normal;
}
void MeshDataTool::set_vertex_normal(int p_idx, const Vector3 &p_normal) {
	ERR_FAIL_INDEX(p_idx, vertices.size());
	vertices.write[p_idx].normal = p_normal;
	format |= Mesh::ARRAY_FORMAT_NORMAL;
}

Plane MeshDataTool::get_vertex_tangent(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Plane());
	return vertices[p_idx].tangent;
}
void MeshDataTool::set_vertex_tangent(int p_idx, const Plane &p_tangent) {
	ERR_FAIL_INDEX(p_idx, vertices.size());
	vertices.write[p_idx].tangent = p_tangent;
	format |= Mesh::ARRAY_FORMAT_TANGENT;
}

Vector2 MeshDataTool::get_vertex_uv(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Vector2());
	return vertices[p_idx].uv;
}
void MeshDataTool::set_vertex_uv(int p_idx, const Vector2 &p_uv) {
	ERR_FAIL_INDEX(p_idx, vertices.size());
	vertices.write[p_idx].uv = p_uv;
	format |= Mesh::ARRAY_FORMAT_TEX_UV;
}

Vector2 MeshDataTool::get_vertex_uv2(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Vector2());
	return vertices[p_idx].uv2;
}
void MeshDataTool::set_vertex_uv2(int p_idx, const Vector2 &p_uv2) {
	ERR_FAIL_INDEX(p_idx, vertices.size());
	vertices.write[p_idx].uv2 = p_uv2;
	format |= Mesh::ARRAY_FORMAT_TEX_UV2;
}

Color MeshDataTool::get_vertex_color(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Color());
	return vertices[p_idx].color;
}
void MeshDataTool::set_vertex_color(int p_idx, const Color &p_color) {
	ERR_FAIL_INDEX(p_idx, vertices.size());
	vertices.write[p_idx].color = p_color;
	format |= Mesh::ARRAY_FORMAT_COLOR;
}

Variant MeshDataTool::get_vertex_meta(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Variant());
	return vertices[p_idx].meta;
}

void MeshDataTool::set_vertex_meta(int p_idx, const Variant &p_meta) {
	ERR_FAIL_INDEX(p_idx, vertices.size());
	vertices.write[p_idx].meta = p_meta;
}

Vector<int> MeshDataTool::get_vertex_edges(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Vector<int>());
	return vertices[p_idx].edges;
}
Vector<int> MeshDataTool::get_vertex_faces(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, vertices.size(), Vector<int>());
	return vertices[p_idx].faces;
}

int MeshDataTool::get_edge_vertex(int p_edge, int p_vertex) const {
	ERR_FAIL_INDEX_V(p_edge, edges.size(), -1);
	ERR_FAIL_INDEX_V(p_vertex, 2, -1);
	return edges[p_edge].vertex[p_vertex];
}
Vector<int> MeshDataTool::get_edge_faces(int p_edge) const {
	ERR_FAIL_INDEX_V(p_edge, edges.size(), Vector<int>());
	return edges[p_edge].faces;
}
Variant MeshDataTool::get_edge_meta(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx, edges.size(), Variant());
	return edges[p_idx].meta;
}
void MeshDataTool::set_edge_meta(int p_idx, const Variant &p_meta) {
	ERR_FAIL_INDEX(p_idx, edges.size());
	edges.write[p_idx].meta = p_meta;
}

int MeshDataTool::get_face_vertex(int p_face, int p_vertex) const {
	ERR_FAIL_INDEX_V(p_face, faces.size(), -1);
	ERR_FAIL_INDEX_V(p_vertex, 3, -1);
	return faces[p_face].v[p_vertex];
}
int MeshDataTool::get_face_edge(int p_face, int p_vertex) const {
	ERR_FAIL_INDEX_V(p_face, faces.size(), -1);
	ERR_FAIL_INDEX_V(p_vertex, 3, -1);
	return faces[p_face].edges[p_vertex];
}
Variant MeshDataTool::get_face_meta(int p_face) const {
	ERR_FAIL_INDEX_V(p_face, faces.size(), Variant());
	return faces[p_face].meta;
}
void MeshDataTool::set_face_meta(int p_face, const Variant &p_meta) {
	ERR_FAIL_INDEX(p_face, faces.size());
	faces.write[p_face].meta = p_meta;
}

Vector3 MeshDataTool::get_face_normal(int p_face) const {
	ERR_FAIL_INDEX_V(p_face, faces.size(), Vector3());
	Vector3 v0 = vertices[faces[p_face].v[0]].vertex;
	Vector3 v1 = vertices[faces[p_face].v[1]].vertex;
	Vector3 v2 = vertices[faces[p_face].v[2]].vertex;

	return Plane(v0, v1, v2).normal;
}

Ref<Material> MeshDataTool::get_material() const {
	return material;
}

void MeshDataTool::set_material(const Ref<Material> &p_material) {
	material = p_material;
}

void MeshDataTool::_bind_methods() {
	ClassDB::bind_method(D_METHOD("clear"), &MeshDataTool::clear);
	ClassDB::bind_method(D_METHOD("create_from_surface", "mesh", "surface"), &MeshDataTool::create_from_surface);
	ClassDB::bind_method(D_METHOD("commit_to_surface", "mesh"), &MeshDataTool::commit_to_surface);

	ClassDB::bind_method(D_METHOD("get_format"), &MeshDataTool::get_format);

	ClassDB::bind_method(D_METHOD("get_vertex_count"), &MeshDataTool::get_vertex_count);
	ClassDB::bind_method(D_METHOD("get_edge_count"), &MeshDataTool::get_edge_count);
	ClassDB::bind_method(D_METHOD("get_face_count"), &MeshDataTool::get_face_count);

	ClassDB::bind_method(D_METHOD("set_vertex", "idx", "vertex"), &MeshDataTool::set_vertex);
	ClassDB::bind_method(D_METHOD("get_vertex", "idx"), &MeshDataTool::get_vertex);

	ClassDB::bind_method(D_METHOD("set_vertex_normal", "idx", "normal"), &MeshDataTool::set_vertex_normal);
	ClassDB::bind_method(D_METHOD("get_vertex_normal", "idx"), &MeshDataTool::get_vertex_normal);

	ClassDB::bind_method(D_METHOD("set_vertex_tangent", "idx", "tangent"), &MeshDataTool::set_vertex_tangent);
	ClassDB::bind_method(D_METHOD("get_vertex_tangent", "idx"), &MeshDataTool::get_vertex_tangent);

	ClassDB::bind_method(D_METHOD("set_vertex_uv", "idx", "uv"), &MeshDataTool::set_vertex_uv);
	ClassDB::bind_method(D_METHOD("get_vertex_uv", "idx"), &MeshDataTool::get_vertex_uv);

	ClassDB::bind_method(D_METHOD("set_vertex_uv2", "idx", "uv2"), &MeshDataTool::set_vertex_uv2);
	ClassDB::bind_method(D_METHOD("get_vertex_uv2", "idx"), &MeshDataTool::get_vertex_uv2);

	ClassDB::bind_method(D_METHOD("set_vertex_color", "idx", "color"), &MeshDataTool::set_vertex_color);
	ClassDB::bind_method(D_METHOD("get_vertex_color", "idx"), &MeshDataTool::get_vertex_color);

	ClassDB::bind_method(D_METHOD("set_vertex_meta", "idx", "meta"), &MeshDataTool::set_vertex_meta);
	ClassDB::bind_method(D_METHOD("get_vertex_meta", "idx"), &MeshDataTool::get_vertex_meta);

	ClassDB::bind_method(D_METHOD("get_vertex_edges", "idx"), &MeshDataTool::get_vertex_edges);
	ClassDB::bind_method(D_METHOD("get_vertex_faces", "idx"), &MeshDataTool::get_vertex_faces);

	ClassDB::bind_method(D_METHOD("get_edge_vertex", "idx", "vertex"), &MeshDataTool::get_edge_vertex);
	ClassDB::bind_method(D_METHOD("get_edge_faces", "idx"), &MeshDataTool::get_edge_faces);

	ClassDB::bind_method(D_METHOD("set_edge_meta", "idx", "meta"), &MeshDataTool::set_edge_meta);
	ClassDB::bind_method(D_METHOD("get_edge_meta", "idx"), &MeshDataTool::get_edge_meta);

	ClassDB::bind_method(D_METHOD("get_face_vertex", "idx", "vertex"), &MeshDataTool::get_face_vertex);
	ClassDB::bind_method(D_METHOD("get_face_edge", "idx", "edge"), &MeshDataTool::get_face_edge);

	ClassDB::bind_method(D_METHOD("set_face_meta", "idx", "meta"), &MeshDataTool::set_face_meta);
	ClassDB::bind_method(D_METHOD("get_face_meta", "idx"), &MeshDataTool::get_face_meta);

	ClassDB::bind_method(D_METHOD("get_face_normal", "idx"), &MeshDataTool::get_face_normal);

	ClassDB::bind_method(D_METHOD("set_material", "material"), &MeshDataTool::set_material);
	ClassDB::bind_method(D_METHOD("get_material"), &MeshDataTool::get_material);
}

MeshDataTool::MeshDataTool() {
	clear();
}