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#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
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#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
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#  along with this program; if not, write to the Free Software Foundation,
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# ##### END GPL LICENSE BLOCK #####

# <pep8-80 compliant>

"""
This module has a similar scope to os.path, containing utility
functions for dealing with paths in Blender.
"""

__all__ = (
    "abspath",
    "basename",
    "clean_name",
    "display_name",
    "display_name_to_filepath",
    "display_name_from_filepath",
    "ensure_ext",
    "extensions_image",
    "extensions_movie",
    "extensions_audio",
    "is_subdir",
    "module_names",
    "native_pathsep",
    "reduce_dirs",
    "relpath",
    "resolve_ncase",
)

import bpy as _bpy
import os as _os

from _bpy_path import (
    extensions_audio,
    extensions_movie,
    extensions_image,
)


def _getattr_bytes(var, attr):
    return var.path_resolve(attr, False).as_bytes()


def abspath(path, *, start=None, library=None):
    """
    Returns the absolute path relative to the current blend file
    using the "//" prefix.

    :arg start: Relative to this path,
       when not set the current filename is used.
    :type start: string or bytes
    :arg library: The library this path is from. This is only included for
       convenience, when the library is not None its path replaces *start*.
    :type library: :class:`bpy.types.Library`
    :return: The absolute path.
    :rtype: string
    """
    if isinstance(path, bytes):
        if path.startswith(b"//"):
            if library:
                start = _os.path.dirname(
                    abspath(_getattr_bytes(library, "filepath")))
            return _os.path.join(
                _os.path.dirname(_getattr_bytes(_bpy.data, "filepath"))
                if start is None else start,
                path[2:],
            )
    else:
        if path.startswith("//"):
            if library:
                start = _os.path.dirname(
                    abspath(library.filepath))
            return _os.path.join(
                _os.path.dirname(_bpy.data.filepath)
                if start is None else start,
                path[2:],
            )

    return path


def relpath(path, *, start=None):
    """
    Returns the path relative to the current blend file using the "//" prefix.

    :arg path: An absolute path.
    :type path: string or bytes
    :arg start: Relative to this path,
       when not set the current filename is used.
    :type start: string or bytes
    :return: The relative path.
    :rtype: string
    """
    if isinstance(path, bytes):
        if not path.startswith(b"//"):
            if start is None:
                start = _os.path.dirname(_getattr_bytes(_bpy.data, "filepath"))
            return b"//" + _os.path.relpath(path, start)
    else:
        if not path.startswith("//"):
            if start is None:
                start = _os.path.dirname(_bpy.data.filepath)
            return "//" + _os.path.relpath(path, start)

    return path


def is_subdir(path, directory):
    """
    Returns true if *path* in a subdirectory of *directory*.
    Both paths must be absolute.

    :arg path: An absolute path.
    :type path: string or bytes
    :return: Whether or not the path is a subdirectory.
    :rtype: boolean
    """
    from os.path import normpath, normcase, sep
    path = normpath(normcase(path))
    directory = normpath(normcase(directory))
    if len(path) > len(directory):
        sep = sep.encode('ascii') if isinstance(directory, bytes) else sep
        if path.startswith(directory.rstrip(sep) + sep):
            return True
    return False


def clean_name(name, *, replace="_"):
    """
    Returns a name with characters replaced that
    may cause problems under various circumstances,
    such as writing to a file.
    All characters besides A-Z/a-z, 0-9 are replaced with "_"
    or the *replace* argument if defined.
    :arg name: The path name.
    :type name: string or bytes
    :arg replace: The replacement for non-valid characters.
    :type replace: string
    :return: The cleaned name.
    :rtype: string
    """

    if replace != "_":
        if len(replace) != 1 or ord(replace) > 255:
            raise ValueError("Value must be a single ascii character")

    def maketrans_init():
        trans_cache = clean_name._trans_cache
        trans = trans_cache.get(replace)
        if trans is None:
            bad_chars = (
                0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
                0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
                0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
                0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
                0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
                0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2e, 0x2f, 0x3a,
                0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x5b, 0x5c,
                0x5d, 0x5e, 0x60, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
                0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
                0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
                0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
                0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
                0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
                0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
                0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
                0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
                0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
                0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
                0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
                0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
                0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
                0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
                0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
                0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe,
            )
            trans = str.maketrans({char: replace for char in bad_chars})
            trans_cache[replace] = trans
        return trans

    trans = maketrans_init()
    return name.translate(trans)


clean_name._trans_cache = {}


def _clean_utf8(name):
    if type(name) == bytes:
        return name.decode("utf8", "replace")
    else:
        return name.encode("utf8", "replace").decode("utf8")


_display_name_literals = {
    ":": "_colon_",
    "+": "_plus_",
    "/": "_slash_",
}


def display_name(name, *, has_ext=True, title_case=True):
    """
    Creates a display string from name to be used menus and the user interface.
    Intended for use with filenames and module names.

    :arg name: The name to be used for displaying the user interface.
    :type name: string
    :arg has_ext: Remove file extension from name.
    :type has_ext: boolean
    :arg title_case: Convert lowercase names to title case.
    :type title_case: boolean
    :return: The display string.
    :rtype: string
    """

    if has_ext:
        name = _os.path.splitext(basename(name))[0]

    # string replacements
    for disp_value, file_value in _display_name_literals.items():
        name = name.replace(file_value, disp_value)

    # strip to allow underscore prefix
    # (when paths can't start with numbers for eg).
    name = name.replace("_", " ").lstrip(" ")

    if title_case and name.islower():
        name = name.lower().title()

    name = _clean_utf8(name)
    return name


def display_name_to_filepath(name):
    """
    Performs the reverse of display_name using literal versions of characters
    which aren't supported in a filepath.
    :arg name: The display name to convert.
    :type name: string
    :return: The file path.
    :rtype: string
    """
    for disp_value, file_value in _display_name_literals.items():
        name = name.replace(disp_value, file_value)
    return name


def display_name_from_filepath(name):
    """
    Returns the path stripped of directory and extension,
    ensured to be utf8 compatible.
    :arg name: The file path to convert.
    :type name: string
    :return: The display name.
    :rtype: string
    """

    name = _os.path.splitext(basename(name))[0]
    name = _clean_utf8(name)
    return name


def resolve_ncase(path):
    """
    Resolve a case insensitive path on a case sensitive system,
    returning a string with the path if found else return the original path.
    :arg path: The path name to resolve.
    :type path: string
    :return: The resolved path.
    :rtype: string
    """

    def _ncase_path_found(path):
        if not path or _os.path.exists(path):
            return path, True

        # filename may be a directory or a file
        filename = _os.path.basename(path)
        dirpath = _os.path.dirname(path)

        suffix = path[:0]  # "" but ensure byte/str match
        if not filename:  # dir ends with a slash?
            if len(dirpath) < len(path):
                suffix = path[:len(path) - len(dirpath)]

            filename = _os.path.basename(dirpath)
            dirpath = _os.path.dirname(dirpath)

        if not _os.path.exists(dirpath):
            if dirpath == path:
                return path, False

            dirpath, found = _ncase_path_found(dirpath)

            if not found:
                return path, False

        # at this point, the directory exists but not the file

        # we are expecting 'dirpath' to be a directory, but it could be a file
        if _os.path.isdir(dirpath):
            try:
                files = _os.listdir(dirpath)
            except PermissionError:
                # We might not have the permission to list dirpath...
                return path, False
        else:
            return path, False

        filename_low = filename.lower()
        f_iter_nocase = None

        for f_iter in files:
            if f_iter.lower() == filename_low:
                f_iter_nocase = f_iter
                break

        if f_iter_nocase:
            return _os.path.join(dirpath, f_iter_nocase) + suffix, True
        else:
            # can't find the right one, just return the path as is.
            return path, False

    ncase_path, found = _ncase_path_found(path)
    return ncase_path if found else path


def ensure_ext(filepath, ext, *, case_sensitive=False):
    """
    Return the path with the extension added if it is not already set.

    :arg filepath: The file path.
    :type filepath: string
    :arg ext: The extension to check for, can be a compound extension. Should
              start with a dot, such as '.blend' or '.tar.gz'.
    :type ext: string
    :arg case_sensitive: Check for matching case when comparing extensions.
    :type case_sensitive: boolean
    :return: The file path with the given extension.
    :rtype: string
    """

    if case_sensitive:
        if filepath.endswith(ext):
            return filepath
    else:
        if filepath[-len(ext):].lower().endswith(ext.lower()):
            return filepath

    return filepath + ext


def module_names(path, *, recursive=False):
    """
    Return a list of modules which can be imported from *path*.

    :arg path: a directory to scan.
    :type path: string
    :arg recursive: Also return submodule names for packages.
    :type recursive: bool
    :return: a list of string pairs (module_name, module_file).
    :rtype: list of strings
    """

    from os.path import join, isfile

    modules = []

    for filename in sorted(_os.listdir(path)):
        if filename == "modules":
            pass  # XXX, hard coded exception.
        elif filename.endswith(".py") and filename != "__init__.py":
            fullpath = join(path, filename)
            modules.append((filename[0:-3], fullpath))
        elif not filename.startswith("."):
            # Skip hidden files since they are used by for version control.
            directory = join(path, filename)
            fullpath = join(directory, "__init__.py")
            if isfile(fullpath):
                modules.append((filename, fullpath))
                if recursive:
                    for mod_name, mod_path in module_names(directory, recursive=True):
                        modules.append(("%s.%s" % (filename, mod_name),
                                        mod_path,
                                        ))

    return modules


def basename(path):
    """
    Equivalent to ``os.path.basename``, but skips a "//" prefix.

    Use for Windows compatibility.
    :return: The base name of the given path.
    :rtype: string
    """
    return _os.path.basename(path[2:] if path[:2] in {"//", b"//"} else path)


def native_pathsep(path):
    """
    Replace the path separator with the systems native ``os.sep``.
    :arg path: The path to replace.
    :type path: string
    :return: The path with system native separators.
    :rtype: string
    """
    if type(path) is str:
        if _os.sep == "/":
            return path.replace("\\", "/")
        else:
            if path.startswith("//"):
                return "//" + path[2:].replace("/", "\\")
            else:
                return path.replace("/", "\\")
    else:  # bytes
        if _os.sep == "/":
            return path.replace(b"\\", b"/")
        else:
            if path.startswith(b"//"):
                return b"//" + path[2:].replace(b"/", b"\\")
            else:
                return path.replace(b"/", b"\\")


def reduce_dirs(dirs):
    """
    Given a sequence of directories, remove duplicates and
    any directories nested in one of the other paths.
    (Useful for recursive path searching).

    :arg dirs: Sequence of directory paths.
    :type dirs: sequence of strings
    :return: A unique list of paths.
    :rtype: list of strings
    """
    dirs = list({_os.path.normpath(_os.path.abspath(d)) for d in dirs})
    dirs.sort(key=lambda d: len(d))
    for i in range(len(dirs) - 1, -1, -1):
        for j in range(i):
            print(i, j)
            if len(dirs[i]) == len(dirs[j]):
                break
            elif is_subdir(dirs[i], dirs[j]):
                del dirs[i]
                break
    return dirs
