#ifndef _UTIL_FILEOP_H
#define _UTIL_FILEOP_H
#include <list>
#include <string>
#include <time.h>
#include <stdint.h>
#include <stdio.h>

namespace fileop {
    /**
     * @brief Check file exists
     * @param fn File name
     * @returns Whether file exists or not
    */
    bool exists(std::string fn);
    /**
     * @brief Remove file
     * @param fn File name
     * @param print_error Print error message
     * @returns true if successed
    */
    bool remove(std::string fn, bool print_error = false);
    /**
     * @brief Get directory name from path
     * @param fn Path
     * @returns Directory. If path does not contain a slash, will return "".
    */
    std::string dirname(std::string fn);
    /**
     * @brief Detect if path is a url.
     * @param fn Path
     * @return true if is a url.
    */
    bool is_url(std::string fn);
    /**
     * @brief Get file name from path
     * @param fn Path
     * @return File name.
    */
    std::string basename(std::string fn);
    /**
     * @brief Parse size string
     * @param size size string. Such as "10KiB", "10", "34B", "48K"
     * @param fs size
     * @param is_byte Whether to return bits or bytes
     * @return true if successed.
    */
    bool parse_size(std::string size, size_t& fs, bool is_byte = true);
    /**
     * @brief Opens a file.
     * @param fn File name.
     * @param fd file descriptor. -1 if error occured.
     * @param oflag The kind of operations allowed.
     * @param shflag The kind of sharing allowed. (Windows Only)
     * @param pmode Permission mode.
     * @return errno
    */
    int open(std::string fn, int& fd, int oflag, int shflag = 0x10, int pmode = 0);
    /**
     * @brief Check if path is absoulte path.
     * @param path The path.
     * @return 
    */
    bool isabs(std::string path);
    /**
     * @brief Join two more pathname components
     * @param path 
     * @param path2 
     * @return result
    */
    std::string join(std::string path, std::string path2);
    /**
     * @brief check if path is an existing directory.
     * @param path Path
     * @param result true if path is an existing directory.
     * @return false if error occured
    */
    bool isdir(std::string path, bool& result);
#if _WIN32
    /**
     * @brief Check if a path only contains drive.
     * @param path Path
     * @return Result
    */
    bool isdrive(std::string path);
#endif
    /**
     * @brief Creates a new directory.
     * @param path Path for a new directory.
     * @param mode Directory permission. (Linux only)
     * @return true if successed.
    */
    bool mkdir(std::string path, int mode);
    /**
     * @brief Sets the date and time that the specified file or directory was created, last accessed, or last modified.
     * @param path The path of directory or file
     * @param ctime creation date (Windows Only)
     * @param actime Last access date
     * @param modtime Last modification date
     * @return true if successed.
    */
    bool set_file_time(std::string path, time_t ctime, time_t actime, time_t modtime);
    /**
     * @brief Associates a stream with a file that was previously opened.
     * @param fd File descriptor of the open file.
     * @param mode Type of file access.
     * @return A pointer to the open stream.
    */
    FILE* fdopen(int fd, std::string mode);
    /**
     * @brief Closes a file.
     * @param fd File descriptor referring to the open file.
     * @return 
    */
    bool close(int fd);
    /**
     * @brief Closes a stream
     * @param f Pointer to FILE structure.
     * @return true if the stream is successfully closed
    */
    bool fclose(FILE* f);
    /**
     * @brief Creates a new directory recursively.
     * @param path Path for a new directory.
     * @param mode Directory permission. (Linux only)
     * @param allow_exists If directory is already exists return true rather than false.
     * @return true if create successfully otherwise false
    */
    bool mkdirs(std::string path, int mode, bool allow_exists = false);
    /**
     * @brief Retrieves the size of the specified file, in bytes.
     * @param path The path of file.
     * @param size Result.
     * @return true if successed otherwise false
    */
    bool get_file_size(std::string path, size_t& size);
    /**
     * @brief Moves the file pointer to a specified location.
     * @param f File
     * @param offset Number of bytes from origin.
     * @param origin Initial position.
     * @return 0 if successed otherwise a nonzero value
    */
    int fseek(FILE* f, int64_t offset, int origin);
    /**
     * @brief Make sure file's directory is already exists, if not exists, try create it.
     * @param path File's path
     * @param mode Directory permission. (Linux only)
     * @return true if file's directory is exists now.
    */
    bool mkdir_for_file(std::string path, int mode);
    /**
     * @brief Gets the current position of a file pointer.
     * @param f Target FILE structure.
     * @return The current position
    */
    int64_t ftell(FILE* f);
    /**
     * @brief List content of a directory.
     * @param path The path of directory
     * @param filelist Result
     * @param ignore_hidden_file Ignore name starts with `.`
     * @return true if successed.
    */
    bool listdir(std::string path, std::list<std::string>& filelist, bool ignore_hidden_file = true);
    /**
     * @brief Return a path without file extension
     * @param path Path
     * @return Result
    */
    std::string filename(std::string path);
    /**
     * @brief Close all open streams
     * If no function is called, will return 0.
     * @return 0(>=0) succeed. EOF error happened.
    */
    int fcloseall();
}
#endif