#include "files.h"

#include <dirent.h>
#include <list>
#include <set>
#include "util.h"

void mrbesen::files::parent(const std::string& child, std::string& out) {
	//letzten path trenner finden
	size_t pos = child.rfind('/', child.length() -2); //das erste Zeichen überspringen (könnte ein / sein)
	if(pos == std::string::npos)
		pos = child.rfind('\\');
	if(pos != std::string::npos)
		out = child.substr(0, pos+1);
	else
		out = "";
}

void mrbesen::files::file(const std::string& path, std::string& out) {
	//letzten path trenner finden
	size_t pos = path.rfind('/', path.length() -2); //das erste Zeichen überspringen (könnte ein / sein)
	if(pos == std::string::npos)
		pos = path.rfind('\\');
	if(pos != std::string::npos)
		out = path.substr(pos+1);
	else
		out = path;
}

void mrbesen::files::extention(const std::string& path, std::string& ext) {
	std::string filestr;
	file(path, filestr);
	size_t pos = filestr.rfind('.');

	if(pos == std::string::npos || pos+1 == filestr.size()) {
		ext = "";
		return;
	}

	ext = filestr.substr(pos+1);
}

template<class Container>
bool mrbesen::files::scan(const std::string& path, std::insert_iterator<Container> it, bool prefixdir, fileNameFilter fnf) {
	return scan(path, [&](const std::string& p, FileType t){ it = p; }, prefixdir, fnf);
}

//curently only these are supported, because iterators may break on others upon insertion
template bool mrbesen::files::scan<std::list<std::string>>(const std::string&, std::insert_iterator<std::list<std::string>>, bool, fileNameFilter);
template bool mrbesen::files::scan<std::set<std::string>>(const std::string&, std::insert_iterator<std::set<std::string>>, bool, fileNameFilter);
template bool mrbesen::files::scan<std::multiset<std::string>>(const std::string&, std::insert_iterator<std::multiset<std::string>>, bool, fileNameFilter);

bool mrbesen::files::scan(const std::string& path, fileCallback clb, bool prefixdir, fileNameFilter fnf) {
	std::string path_ = path;
	mrbesen::util::insertEnd(path_, "/");
	
	::DIR* dir = opendir(path_.c_str());
	if(!dir) {
		return false;
	}

	//read dir
	struct ::dirent* entr;
	while((entr = readdir(dir))) {
		std::string fname = entr->d_name;
		FileType type = (FileType) entr->d_type; //DT_BLK DT_CHR DT_DIR DT_FIFO DT_LNK DT_REG DT_SOCK DT_UNKNOWN (dirent.h, man readdir)
		if(fnf) {
			if(!fnf(fname, type)) {
				continue;
			}
		}
		if(prefixdir)
			fname = path_ + fname;
		clb(fname, type);
	}

	closedir(dir);

	return true;
}