#include "OBJ.h"

namespace roxlu {

bool OBJ::import(const string& filepath) {
	ifstream ifs;
	ifs.open(filepath.c_str());
	if(!ifs.is_open()) {
		printf("Cannot open: %s\n", filepath.c_str());
		return false;
	}

	Triangle tri;
	Vec3 v;
	OBJ::Object object;
	string line;
	bool object_added = false;
	bool found_object = false;
	while(getline(ifs, line)) {
		if(line.at(0) == '#') {
			continue;
		}

		int space = line.find(" ");
		if(space == string::npos) {
			continue;
		}

		string cmd = line.substr(0, space);

		// object
		if(cmd == "o") {
			if(found_object) {
				object_added = true;
				objects[object.name] = object;
			}
			found_object = true;
			object.name = line.substr(space+1, line.size()-1);
		}
		// vertex
		else if(found_object && cmd == "v") {
			stringstream ss;
			ss << line.substr(space+1, line.size()-1);
			ss >> v.x >> v.y >> v.z;
			object.vertices.addVertex(v);
		}
		// normal
		else if(found_object && cmd == "vn") {
			stringstream ss;
			ss << line.substr(space+1, line.size()-1);
			ss >> v.x >> v.y >> v.z;
			object.vertices.addNormal(v);
		}
		// face
		else if(found_object && cmd == "f") {
			stringstream ss;
			ss << line.substr(space+1, line.size()-1);
			string face;

			ss >> face;
			extractFace(face, tri.va, tri.na);


			ss >> face;
			extractFace(face, tri.vb, tri.nb);

			ss >> face;
			extractFace(face, tri.vc, tri.nc);

			object.vertices.addTriangle(tri);
			Vec3 vv = object.vertices.vertices[tri.va];

		}
	}
	if(!object_added) {
		objects[object.name] = object;
	}
}

bool OBJ::extractFace(string info, int& vertexIndex, int& normalIndex) {
	stringstream fss;
	fss << info;
	string fv;

	// get vertex index
	if(getline(fss, fv, '/')) {
		if(fv.size()) {
			stringstream ofss;
			ofss << fv;
			ofss >> vertexIndex;
			--vertexIndex;
		}
	}

	// get texcoord index
	if(getline(fss, fv, '/')) {
		if(fv.size()) {
		//	ofss << fv;
		//	ofss >> vertexIndex;
		}
	}

	// get normal index
	if(getline(fss, fv, '/')) {
		if(fv.size()) {
			stringstream ofss;
			ofss << fv;
			ofss >> normalIndex;
			--normalIndex;
		}
	}
}

};