#include "filesystem.hpp"
#include <sys/stat.h>
#include <stdlib.h>
#include <linux/limits.h>

bool FSLib::exists(const std::string &path) {
    struct stat path_stat;
    return stat( path.c_str(), &path_stat ) == 0;
}

bool FSLib::isDirectory(const std::string &path) {
    struct stat path_stat;
    stat( path.c_str(), &path_stat );
    return S_ISDIR(path_stat.st_mode);
}

std::string FSLib::canonical(const std::string &path) {
    char *canonical_path = static_cast<char *>(malloc(PATH_MAX));
    if( realpath(path.c_str(), canonical_path) == nullptr ) {
        free(canonical_path);
        return "";
    }
    std::string canonical_string{canonical_path};
    free(canonical_path);
    return canonical_string;
}

bool FSLib::rename(const std::string &file_a, const std::string &file_b) {
    return ::rename( file_a.c_str(), file_b.c_str() ) == 0;
}

FSLib::Directory::iterator FSLib::Directory::begin() {
    return Iterator(dir_path);
}

FSLib::Directory::const_iterator FSLib::Directory::begin() const {
    return Iterator(dir_path);
}

FSLib::Directory::const_iterator FSLib::Directory::cbegin() const {
    return begin();
}

FSLib::Directory::iterator FSLib::Directory::end() {
    return Iterator(dir_path, nullptr);
}

FSLib::Directory::const_iterator FSLib::Directory::end() const {
    return Iterator(dir_path, nullptr);
}

FSLib::Directory::const_iterator FSLib::Directory::cend() const {
    return end();
}

const char *FSLib::Directory::path() const {
    return dir_path.c_str();
}

char const *FSLib::Directory::Iterator::operator*() const {
    return current_entry->d_name;
}

FSLib::Directory::Iterator &FSLib::Directory::Iterator::operator++() {
    if( current_entry == nullptr )
        return *this;
    current_entry = readdir(d);
    if( current_entry != nullptr && ( !strcmp(current_entry->d_name, ".") || !strcmp(current_entry->d_name, "..") ) )
        return operator++();
    return *this;
}

FSLib::Directory::Iterator FSLib::Directory::Iterator::operator++(int) {
    Iterator ret(*this);
    operator++();
    return ret;
}

bool FSLib::Directory::Iterator::operator==(const Iterator &i_other) const {
    return i_other.current_entry == current_entry;
}

bool FSLib::Directory::Iterator::operator!=(const Iterator &i_other) const {
    return i_other.current_entry != current_entry;
}