from os import scandir
from pathlib import Path
from typing import List

# image_extensions = [".jpg", ".jpeg", ".png", ".tif", ".tiff"]

# def write_bytes_safe(p, bytes_data):
#     """
#     writes to .tmp first and then rename to target filename
#     """
#     p_tmp = p.parent / (p.name + '.tmp')
#     p_tmp.write_bytes(bytes_data)
#     if p.exists():
#         p.unlink()
#     p_tmp.rename (p)

def scantree(path):
    """Recursively yield DirEntry objects for given directory."""
    for entry in scandir(path):
        if entry.is_dir(follow_symlinks=False):
            yield from scantree(entry.path)
        else:
            yield entry


def get_files_paths(dir_path, extensions=None, subdirs=False) -> List[Path]:
    """
    returns array of Path() of files
    """
    dir_path = Path (dir_path)

    result = []
    if dir_path.exists():

        if subdirs:
            gen = scantree(str(dir_path))
        else:
            gen = scandir(str(dir_path))

        for x in list(gen):
            if extensions is None or any([x.name.lower().endswith(ext) for ext in extensions]):
                result.append( Path(x.path) )
    return sorted(result)

# def get_image_unique_filestem_paths(dir_path, verbose_print_func=None):
#     result = get_image_paths(dir_path)
#     result_dup = set()

#     for f in result[:]:
#         f_stem = Path(f).stem
#         if f_stem in result_dup:
#             result.remove(f)
#             if verbose_print_func is not None:
#                 verbose_print_func ("Duplicate filenames are not allowed, skipping: %s" % Path(f).name )
#             continue
#         result_dup.add(f_stem)

#     return sorted(result)

# def get_paths(dir_path):
#     dir_path = Path (dir_path)

#     if dir_path.exists():
#         return [ Path(x) for x in sorted([ x.path for x in list(scandir(str(dir_path))) ]) ]
#     else:
#         return []

# def get_file_paths(dir_path):
#     dir_path = Path (dir_path)

#     if dir_path.exists():
#         return [ Path(x) for x in sorted([ x.path for x in list(scandir(str(dir_path))) if x.is_file() ]) ]
#     else:
#         return []

# def get_all_dir_names (dir_path):
#     dir_path = Path (dir_path)

#     if dir_path.exists():
#         return sorted([ x.name for x in list(scandir(str(dir_path))) if x.is_dir() ])
#     else:
#         return []

# def get_all_dir_names_startswith (dir_path, startswith):
#     dir_path = Path (dir_path)
#     startswith = startswith.lower()

#     result = []
#     if dir_path.exists():
#         for x in list(scandir(str(dir_path))):
#             if x.name.lower().startswith(startswith):
#                 result.append ( x.name[len(startswith):] )
#     return sorted(result)

# def get_first_file_by_stem (dir_path, stem, exts=None):
#     dir_path = Path (dir_path)
#     stem = stem.lower()

#     if dir_path.exists():
#         for x in sorted(list(scandir(str(dir_path))), key=lambda x: x.name):
#             if not x.is_file():
#                 continue
#             xp = Path(x.path)
#             if xp.stem.lower() == stem and (exts is None or xp.suffix.lower() in exts):
#                 return xp

#     return None

# def move_all_files (src_dir_path, dst_dir_path):
#     paths = get_file_paths(src_dir_path)
#     for p in paths:
#         p = Path(p)
#         p.rename ( Path(dst_dir_path) / p.name )

# def delete_all_files (dir_path):
#     paths = get_file_paths(dir_path)
#     for p in paths:
#         p = Path(p)
#         p.unlink()