#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>


#include <boost/algorithm/string.hpp>
#include <boost/filesystem.hpp>
#include <boost/program_options.hpp>

namespace po = boost::program_options;

using namespace std;

const int BUFSIZE = 1024*1024;

string remove_comments(string in) {
	bool isComment = false;
	ostringstream out;
	for (int i=0; i<in.length() -1; i++) {
		if (in.at(i) == '/' && in.at(i+1) == '*')  
			isComment = true;
		
		if (in.at(i) == '*' && in.at(i+1) == '/') {
			i++;
			isComment = false;
			continue;
		}

		if (isComment == false)
			out << in.at(i) ;
	}

	return out.str();
}

string getLastWord(string input) {
	input = remove_comments(input);

	boost::erase_all(input,"`");
	boost::trim(input);
	vector<string> words;
	words = boost::split(words, input, boost::is_any_of(" ") );

	string last = words.back();

	boost::erase_all(last, ";");
	boost::trim(last);


	return last;
}


int main(int argc, char** argv) {

	po::options_description desc("Mysql dump file splitter:\nAllowed options");
	desc.add_options()
    	("help", "produce help message")
    	("data", "ignore ceate tablestatements")
		("input-file", po::value< string >(), "input file")
	;

	po::positional_options_description p;
	p.add("input-file", -1);


	po::variables_map vm;
	po::store( po::command_line_parser(argc, argv).options(desc).positional(p).run(), vm);
	po::notify(vm);

	if (vm.count("help")) {
    	cout << desc << "\n";
    	return 1;
	}



	if ( vm.count("input-file") == 0) {
		cout << desc << endl;
		return 1;
	}


	char linebuf[BUFSIZE];

	string inputfile = vm["input-file"].as< string >();
	if (! boost::filesystem::exists(inputfile) ) {
		cout << "No file named " << inputfile << endl;
		return 1;
	}
	

	ifstream in( inputfile.c_str() );
	ofstream out;

	ostringstream header;

	if (!in.is_open() ) {
		cout << "Could not open " << argv[1] << endl;
		return 2;
	}

	while ( in.good() ) {
		in.getline(linebuf, BUFSIZE);

		string line(linebuf);


		//if (line.substr(0, 15) == "CREATE DATABASE" ) {
		if ( boost::starts_with(line, "CREATE DATABASE") ) {

			if (out.is_open() ) {
				out.close();
			}

			boost::trim(line);
			string dbname = getLastWord(line);
			cout << ">" << dbname << endl;


			ostringstream oss;
			oss << dbname << "_dump.sql";

            string filename = oss.str();

			bool did_exist = boost::filesystem::exists(filename);

			out.open( filename.c_str(), ios::app );



			if (!out.is_open() ) {
				cout << "could not create outfile " << filename << endl;
				return 3;
			}

			if (!did_exist) {
				out << header.str() << endl; //write preamble in new file
			}

		}


		if (out.is_open() ) {
			out << line << endl;
		} else {
			header << line << endl; //collect preamble for later use
		}

	}


	if(out.is_open())
		out.close();


	in.close();
}