'''
Created on 26 janv. 2016
    Convenient methods for manage files and directories
@author: olivier.massot
'''
import os
import shutil
import subprocess

__VERSION__ = "0.1"

def fdir(path):
    """return the parent directory of the file or directory
    (no existence control)"""
    return os.path.join(os.path.dirname(path), "")

def fname(chemin, ext=True):
    """return the name of the file
    ext: return the name with its extension
    (no existence control)"""
    if not ext:
        chemin = os.path.splitext(chemin)[0]
    return os.path.basename(chemin)

def fext(chemin):
    """return the extension of the file
    (no existence control)"""
    try:
        return os.path.splitext(chemin)[1]
    except IndexError:
        return ""

def fexists(path):
    """test the existence of a file or directory"""
    return os.path.exists(os.path.normpath(path))

def fishttp(path):
    """is the path a web url?"""
    return path[0:7] == "http://" or path[0:8] == "https://"

def frun(path):
    """run/open the required file, directory, webpage..."""
    if not fishttp(path):
        path = os.path.normpath(path)
    try:
        os.startfile(path)
    except AttributeError:
        subprocess.call(['open', path])

def flist(target_dir, recursive=False, listdirs=False, listfiles=True, complete_paths=False):
    """list the subdirectories and/or the files of the directory;
    """
    if not os.path.isdir(target_dir):
        raise ValueError("'{var}' is not an valid directory".format(var=target_dir))
    result = []
    for root, dirs, files in os.walk(target_dir):
        if listdirs:
            if complete_paths:
                dirs = [os.path.join(root, d) for d in dirs]
            result.extend(dirs)
        if listfiles:
            if complete_paths:
                files = [os.path.join(root, f) for f in files]
            result.extend(files)
        if not recursive:
            break
    return result

def fcopy(file_path, target, erase=False):
    """copy the file
    - If target is a directory, copy the file in this directory and keep its name
    - If target is a file path, copy the file to match this path
    if erase is True but there is already a file at this path,
    append a suffix '_X' to the file name"""
    file_path = os.path.normpath(file_path)
    cible = os.path.normpath(target)
    if not os.path.isfile(file_path):
        raise IOError("File {file_path} does not exist".format(file_path=file_path))
    if not os.path.isdir(target):
        if len(fname(target)) > 0:
            target_dir = os.path.dirname(target)
        else:
            raise IOError("{target_dir} is not a valid target".format(target_dir=target_dir))
    else:
        target_dir = cible

    name, ext = (fname(target, False), fext(target)) if len(fname(target)) > 0 \
                 else (fname(file_path, False), fext(file_path))
    target = os.path.join(target_dir, '%s%s' % (name, ext))
    if not erase:
        counter = 1
        while fexists(target):
            counter += 1
            target = os.path.join(target_dir, '%s_%d%s' % (name, counter, ext))
    shutil.copyfile(file_path, target)
    return target

def faccess(path, mode="r"):
    """return True if user has an access to the directory or file in parameter
    Warning: a negative answer could be caused by a missing access
    or by an impossibility to connect to the drive"""

    if mode not in ("r", "w"):
        raise ValueError("mode should be 'r' or 'w'")
    not_found = False

    path = os.path.normpath(path)

    try:
        with open(path, mode) as _:
            pass
        return True
    except (PermissionError, FileNotFoundError, OSError):
        not_found = True

    if not_found:
        if mode == "r":
            try:
                next(os.walk(path))
            except StopIteration:
                return False
            return True
        else:
            try:
                with open(os.path.join(path, "__test__"), "w") as _:
                    pass
                os.remove(os.path.join(path, "__test__"))
                return True
            except PermissionError:
                return False
            else:
                raise FileNotFoundError("File {path} does not exist".format(path=path))

def fjoin(*args):
    """recursively the paths in parameter"""
    result = ""
    for path in args:
        result = os.path.join(result, os.path.normpath(path))
    return result

def fmkdir(dirpath):
    """ create the directory recursively """
    sub_path = os.path.dirname(dirpath)
    if not os.path.exists(sub_path):
        fmkdir(sub_path)
    if not os.path.exists(dirpath):
        os.mkdir(dirpath)

def frmdir(dirpath):
    """delete the directory, even it is not empty"""
    shutil.rmtree(dirpath)

def fhumansize(size):
    """return a human readable size of file"""
    suffixes = ['bytes', 'kB', 'MB', 'GB', 'TB']
    suffix_index = 0
    while size >= 1024:
        suffix_index += 1 #increment the index of the suffix
        size = size/1024.0 #apply the division
    return "{0:03.2f} {1}".format(size, suffixes[suffix_index]) if suffix_index > 0 \
           else "{0} {1}".format(size, suffixes[suffix_index])