#include "handle_dep.h"
#include <string>
#include <sstream>
#include <stdlib.h> // for system()
#include <boost/unordered_set.hpp>
#include <boost/foreach.hpp>
#include <boost/regex.hpp>
#include <boost/filesystem.hpp>
namespace fs = boost::filesystem;
#include "boosty.h"

boost::unordered_set<std::string> dependencies;
const char *make_command = NULL;

void handle_dep(const std::string &filename)
{
	fs::path filepath(filename);
	std::string dep;
	if (boosty::is_absolute(filepath)) dep = filename;
	else dep = (fs::current_path() / filepath).string();
	dependencies.insert(boost::regex_replace(filename, boost::regex("\\ "), "\\\\ "));

	if (!fs::exists(filepath) && make_command) {
		std::stringstream buf;
		buf << make_command << " '" << boost::regex_replace(filename, boost::regex("'"), "'\\''") << "'";
		system(buf.str().c_str()); // FIXME: Handle error
	}
}

bool write_deps(const std::string &filename, const std::string &output_file)
{
	FILE *fp = fopen(filename.c_str(), "wt");
	if (!fp) {
		fprintf(stderr, "Can't open dependencies file `%s' for writing!\n", filename.c_str());
		return false;
	}
	fprintf(fp, "%s:", output_file.c_str());

	BOOST_FOREACH(const std::string &str, dependencies) {
		fprintf(fp, " \\\n\t%s", str.c_str());
	}
	fprintf(fp, "\n");
	fclose(fp);
	return true;
}