//
// C++ Implementation: MeshSerializerListener
//
// Description: 
//
//
// Author: Erik Ogenvik <erik@ogenvik.org>, (C) 2009
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.//
//
#include "MeshSerializerListener.h"
#include "framework/TimedLog.h"
#include "framework/Log.h"
#include <sstream>

namespace Ember::OgreView {

MeshSerializerListener::MeshSerializerListener(bool requireTangents)
		: mRequireTangents(requireTangents) {
}


MeshSerializerListener::~MeshSerializerListener() = default;

void MeshSerializerListener::processMaterialName(Ogre::Mesh* mesh, Ogre::String* name) {

}

void MeshSerializerListener::processSkeletonName(Ogre::Mesh* mesh, Ogre::String* name) {
	//If the skeleton path starts with ".." it's a relative path and we need to use the path of the current mesh to create a new skeleton path
	if (Ogre::StringUtil::startsWith(*name, "../") || Ogre::StringUtil::startsWith(*name, "./")) {
		const std::string& meshPath = mesh->getName();
		std::string path;
		std::string baseName;
		Ogre::StringUtil::splitFilename(meshPath, baseName, path);

		auto skeletonPathSegments = Ogre::StringUtil::split(*name, "/");
		auto pathSegments = Ogre::StringUtil::split(path, "/");

		//For every ".." part in the skeleton path, walk upwards in the directory hierarcy
		while (*skeletonPathSegments.begin() == ".." || *skeletonPathSegments.begin() == ".") {
			if (*skeletonPathSegments.begin() == "..") {
				pathSegments.pop_back();
			}
			skeletonPathSegments.erase(skeletonPathSegments.begin());
		}

		std::stringstream ss;
		for (auto I = pathSegments.begin(); I != pathSegments.end(); ++I) {
			if (I != pathSegments.begin()) {
				ss << "/";
			}
			ss << *I;
		}
		for (auto& skeletonPathSegment: skeletonPathSegments) {
			ss << "/" << skeletonPathSegment;
		}
		name->assign(ss.str());
	}
}

void MeshSerializerListener::processMeshCompleted(Ogre::Mesh* mesh) {
	if (mRequireTangents) {
		//Ḿake sure that the mesh has tangents. This takes time, but is ok during development.
		unsigned short outSourceCoordSet;
		try {
			if (!mesh->suggestTangentVectorBuildParams(outSourceCoordSet)) {
#ifdef DEBUG
				logger->debug("No tangents available for {} mesh; generating new ones now.", mesh->getName());
#else
				logger->warn("No tangents available for {} mesh; generating new ones now. You should instead make sure that all meshes have tangents pregenerated.", mesh->getName());
#endif
				Ember::TimedLog timedLog("Building tangents for " + mesh->getName());
				mesh->buildTangentVectors(outSourceCoordSet);
			}

		} catch (const Ogre::Exception&) {
			//Just swallow exceptions, since this just means that we couldn't generate any tangents.
		}
	}
}

}

