#include <cstdio>
#include <exception>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>

#include <boost/regex.hpp>

#include <json/json.h>

using namespace std;

const char* DBLP_FILENAME = "test.json";
const char* DBLP_COAUTHOR_FILENAME = "tmp_dblp_coauthorship.json";
const string COLUMN_DELIMITER = "||";
const string AUTHOR_DELIMITER = "&&";

int main() {
	//init
	Json::Value root;
	Json::Reader reader;
	ifstream dblp_paper, dblp_coauthor;
	ofstream dblp_paper_out, dblp_coauthor_out;

	try {
		//1. dblp paper dataset
		dblp_paper.open(DBLP_FILENAME);
		dblp_paper_out.open((string(DBLP_FILENAME)+string(".out")).c_str());
		if (!dblp_paper || !dblp_paper_out) {
			throw exception("dblp paper file error");
		}
		printf("* complete open\n");

		if (!reader.parse(dblp_paper, root)) {
			throw exception("parse error");
		}
		printf("* complete parse\n");


		Json::Value row;
		Json::Value coauthors;

		std::string paper_key;
		std::vector<string> coauthor_list;
		int year;

		int count = 1;
		for (auto it=root.begin();
			it!=root.end();
			++it) {
			//Àüó¸®
			row.clear();
			coauthors.clear();
			coauthor_list.clear();

			//print
			if (count%1000000 == 0) {
				printf("* [%d]\n", count);
			}

			//row ´ÜÀ§·Î read
			row = *it;
			paper_key = row[0].asString();
			coauthors = row[1];
			for (auto coit=coauthors.begin(); coit!=coauthors.end(); ++coit) {
				coauthor_list.push_back(coit->asString());
			}
			year = ((row[2].isNull())?-1:row[2].asInt());

			//write
			dblp_paper_out << paper_key << COLUMN_DELIMITER;
			for (auto auit=coauthor_list.begin(); auit!=coauthor_list.end(); ++auit) {
				dblp_paper_out << (*auit);
				if () {
					dblp_paper_out << AUTHOR_DELIMITER;
				}
			}
			dblp_paper_out << endl;

			//ÈÄó¸®
			++count;
		}
		printf("* complete convert dblp paper\n");
	

		//2. dblp coauthorship dataset
		//dblp_coauthor.open(DBLP_COAUTHOR_FILENAME);


	}
	catch (const exception& e) {
		cerr << "Error: " << e.what() << endl;
		return -1;
	}

	//release
	dblp_paper.close();
	dblp_coauthor.close();
	dblp_paper_out.close();
	dblp_coauthor_out.close();
	return 0;
}