#include "graph.h"

using namespace Rotor;
using namespace std;

bool Graph::check_audio(string audio,string path){
	if (audio!="")	{
		audio_filename=path+audio;
		Poco::File f=Poco::File(audio_filename);
		if (f.exists()) {
			//here we should check the audio is actually valid
			audio_loaded=true;
			cerr<<"Rotor: loading "<<audio_filename<<" from graph"<<endl;
			return true;
		}
		cerr<<"Rotor: audio file "<<audio_filename<<" not found"<<endl;
	}
	return false;
}
bool Graph::load_file(std::string filename,std::string media_path){
	Poco::File f=Poco::File(filename);
	if (f.exists()) {
		Poco::FileInputStream fis(filename);
		Poco::CountingInputStream countingIstr(fis);
		std::string str;
		Poco::StreamCopier::copyToString(countingIstr, str);
		return parse_json(str,media_path);
	}
	cerr<<"Rotor: graph "<<filename<<" not found"<<endl;
	return false;
}
Node* Graph::find_node(const string &type){
	for (std::unordered_map<string,Node*>::iterator it=nodes.begin();it!=nodes.end();++it) {
		if (it->second->get_type()==type) return it->second;
	}
	return nullptr;
};
bool Graph::parse_json(string &data,string &media_path){
	Json::Value root;   // will contain the root value after parsing.
	Json::Reader reader;
	bool parsing_successful = reader.parse( data, root );
	if ( !parsing_successful )
	{
	    std::cout  << "Failed to parse configuration\n"
	               << reader.getFormattedErrorMessages();
	    return false;
	}
	//The json validates, now we should attempt to retain nodes which haven't changed
	//for now just clear the existing graph
	clear();
	Node_factory factory;
	check_audio(root["audio"].asString(),media_path);
	init(root["id"].asString());
	Json::Value jnodes = root["nodes"];
	for ( uint32_t i = 0; i < jnodes.size(); ++i ) {
		string node_id=jnodes[i]["id"].asString();
		Node* node=factory.create(jnodes[i]);
		if (node) {
			if (nodes.find(node_id)==nodes.end()){
				cerr << "Rotor: creating node '"<<node_id<<"': '"<<jnodes[i]["type"].asString()<< "'" << endl;
				//kind of have to do the links from outside thus
				//how do deal with variable arrays?
				//
				//on our left.. an array of pointers to variables.. 
				//some of which contain arrays of pointers to variables
				//
				//on our right.. an unordered map of nodes to be linked to
				//
				//node.create_links(nodes)
				//will allow the nodes to be passed into each member of a variable array
				node->create_connections(nodes);
				nodes[node_id]=node;
			}
			else cerr << "ERROR: duplicate node '"<<node_id<<"' "<< endl;
		}
		else {
			cerr << "ERROR: graph loader cannot find node '" <<jnodes[i]["type"].asString()<< "'" << endl;
			return false;
		}
	}
	return true;
}

//should nodes be identified by uuid rather than name?
//array inlets can be identified by number as this is all they usually are