"""
Components/FileManager
======================

A simple manager for selecting directories and files.

Usage
-----

.. code-block:: python

    path = os.path.expanduser("~")  # path to the directory that will be opened in the file manager
    file_manager = MDFileManager(
        exit_manager=self.exit_manager,  # function called when the user reaches directory tree root
        select_path=self.select_path,  # function called when selecting a file/directory
    )
    file_manager.show(path)

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager.png
    :align: center

.. warning:: Be careful! To use the `'/'` path on Android devices, you need
    special permissions. Therefore, you are likely to get an error.

Or with ``preview`` mode:

.. code-block:: python

    file_manager = MDFileManager(
        exit_manager=self.exit_manager,
        select_path=self.select_path,
        preview=True,
    )

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager-preview.png
    :align: center

.. warning:: The `preview` mode is intended only for viewing images and will
    not display other types of files.

Example
-------

.. code-block:: python

    import os

    from kivy.core.window import Window
    from kivy.lang import Builder

    from kivymd.app import MDApp
    from kivymd.uix.filemanager import MDFileManager
    from kivymd.toast import toast


    KV = '''
    MDBoxLayout:
        orientation: "vertical"

        MDTopAppBar:
            title: "MDFileManager"
            left_action_items: [["menu", lambda x: None]]
            elevation: 3

        MDFloatLayout:

            MDRoundFlatIconButton:
                text: "Open manager"
                icon: "folder"
                pos_hint: {"center_x": .5, "center_y": .5}
                on_release: app.file_manager_open()
    '''


    class Example(MDApp):
        def __init__(self, **kwargs):
            super().__init__(**kwargs)
            Window.bind(on_keyboard=self.events)
            self.manager_open = False
            self.file_manager = MDFileManager(
                exit_manager=self.exit_manager, select_path=self.select_path
            )

        def build(self):
            self.theme_cls.theme_style = "Dark"
            self.theme_cls.primary_palette = "Orange"
            return Builder.load_string(KV)

        def file_manager_open(self):
            self.file_manager.show(os.path.expanduser("~"))  # output manager to the screen
            self.manager_open = True

        def select_path(self, path: str):
            '''
            It will be called when you click on the file name
            or the catalog selection button.

            :param path: path to the selected directory or file;
            '''

            self.exit_manager()
            toast(path)

        def exit_manager(self, *args):
            '''Called when the user reaches the root of the directory tree.'''

            self.manager_open = False
            self.file_manager.close()

        def events(self, instance, keyboard, keycode, text, modifiers):
            '''Called when buttons are pressed on the mobile device.'''

            if keyboard in (1001, 27):
                if self.manager_open:
                    self.file_manager.back()
            return True


    Example().run()

.. versionadded:: 1.0.0

Added a feature that allows you to show the available disks first, then the
files contained in them. Works correctly on: `Windows`, `Linux`, `OSX`, `Android`.
Not tested on `iOS`.

.. code-block:: python

    def file_manager_open(self):
        self.file_manager.show_disks()

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager-show-disks.png
    :align: center
"""

__all__ = ("MDFileManager",)

import locale
import os
import re
from typing import List, Tuple, Union

from kivy import platform
from kivy.clock import Clock
from kivy.factory import Factory
from kivy.lang import Builder
from kivy.metrics import dp
from kivy.properties import (
    BooleanProperty,
    ColorProperty,
    ListProperty,
    NumericProperty,
    ObjectProperty,
    OptionProperty,
    StringProperty,
)
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.modalview import ModalView

from kivymd import images_path, uix_path
from kivymd.theming import ThemableBehavior
from kivymd.uix.behaviors import CircularRippleBehavior
from kivymd.uix.boxlayout import MDBoxLayout
from kivymd.uix.button import MDFloatingActionButton
from kivymd.uix.fitimage import FitImage
from kivymd.uix.list import BaseListItem
from kivymd.uix.relativelayout import MDRelativeLayout

with open(
    os.path.join(uix_path, "filemanager", "filemanager.kv"), encoding="utf-8"
) as kv_file:
    Builder.load_string(kv_file.read())


class BodyManager(MDBoxLayout):
    """Base class for folders and files icons."""


class BodyManagerWithPreview(MDBoxLayout):
    """
    Base class for folder icons and thumbnails images in ``preview`` mode.
    """


class IconButton(CircularRippleBehavior, ButtonBehavior, FitImage):
    """Folder icons/thumbnails images in ``preview`` mode."""


class ModifiedOneLineIconListItem(BaseListItem):
    _txt_left_pad = NumericProperty("72dp")
    _txt_top_pad = NumericProperty("16dp")
    _txt_bot_pad = NumericProperty("15dp")
    _num_lines = 1

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.height = dp(48)


class MDFileManager(MDRelativeLayout, ThemableBehavior):
    """
    Implements a modal dialog with a file manager.

    For more information, see in the
    :class:`~kivymd.uix.relativelayout.MDRelativeLayout` class documentation.

    :Events:
        `on_pre_open`:
            Called before the MDFileManager is opened.
        `on_open`:
            Called when the MDFileManager is opened.
        `on_pre_dismiss`:
            Called before the MDFileManager is closed.
        `on_dismiss`:
            Called when the MDFileManager is closed.
    """

    icon = StringProperty("check", deprecated=True)
    """
    Icon that will be used on the directory selection button.

    .. deprecated:: 1.1.0
        Use :attr:`icon_selection_button` instead.

    :attr:`icon` is an :class:`~kivy.properties.StringProperty`
    and defaults to `check`.
    """

    icon_selection_button = StringProperty("check")
    """
    Icon that will be used on the directory selection button.

    .. versionadded:: 1.1.0

    .. code-block:: python

        MDFileManager(
            ...
            icon_selection_button="pencil",
        )

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager-icon-selection-button.png
        :align: center

    :attr:`icon_selection_button` is an :class:`~kivy.properties.StringProperty`
    and defaults to `check`.
    """

    background_color_selection_button = ColorProperty(None)
    """
    Background color of the current directory/path selection button.

    .. versionadded:: 1.1.0

    .. code-block:: python

        MDFileManager(
            ...
            background_color_selection_button="brown",
        )

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager-background-color-selection-button.png
        :align: center

    :attr:`background_color_selection_button` is an :class:`~kivy.properties.ColorProperty`
    and defaults to `None`.
    """

    background_color_toolbar = ColorProperty(None)
    """
    Background color of the file manager toolbar.

    .. versionadded:: 1.1.0

    .. code-block:: python

        MDFileManager(
            ...
            background_color_toolbar="brown",
        )

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager-background-color-toolbar.png
        :align: center

    :attr:`background_color_toolbar` is an :class:`~kivy.properties.ColorProperty`
    and defaults to `None`.
    """

    icon_folder = StringProperty(f"{images_path}folder.png")
    """
    Icon that will be used for folder icons when using ``preview = True``.

    .. code-block:: python

        MDFileManager(
            ...
            preview=True,
            icon_folder="path/to/icon.png",
        )

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager-icon-folder.png
        :align: center

    :attr:`icon` is an :class:`~kivy.properties.StringProperty`
    and defaults to `check`.
    """

    icon_color = ColorProperty(None)
    """
    Color of the folder icon when the :attr:`preview` property is set to False.

    .. versionadded:: 1.1.0

    .. code-block:: python

        MDFileManager(
            ...
            preview=False,
            icon_color="brown",
        )

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/file-manager-icon-color.png
        :align: center

    :attr:`icon_color` is an :class:`~kivy.properties.ColorProperty`
    and defaults to `None`.
    """

    exit_manager = ObjectProperty(lambda x: None)
    """
    Function called when the user reaches directory tree root.

    :attr:`exit_manager` is an :class:`~kivy.properties.ObjectProperty`
    and defaults to `lambda x: None`.
    """

    select_path = ObjectProperty(lambda x: None)
    """
    Function, called when selecting a file/directory.

    :attr:`select_path` is an :class:`~kivy.properties.ObjectProperty`
    and defaults to `lambda x: None`.
    """

    ext = ListProperty()
    """
    List of file extensions to be displayed in the manager.
    For example, `['.py', '.kv']` - will filter out all files,
    except python scripts and Kv Language.

    :attr:`ext` is an :class:`~kivy.properties.ListProperty`
    and defaults to `[]`.
    """

    search = OptionProperty("all", options=["all", "dirs", "files"])
    """
    It can take the values 'all' 'dirs' 'files' - display only directories
    or only files or both them. By default, it displays folders, and files.
    Available options are: `'all'`, `'dirs'`, `'files'`.

    :attr:`search` is an :class:`~kivy.properties.OptionProperty`
    and defaults to `all`.
    """

    current_path = StringProperty(os.path.expanduser("~"))
    """
    Current directory.

    :attr:`current_path` is an :class:`~kivy.properties.StringProperty`
    and defaults to `os.path.expanduser("~")`.
    """

    use_access = BooleanProperty(True)
    """
    Show access to files and directories.

    :attr:`use_access` is an :class:`~kivy.properties.BooleanProperty`
    and defaults to `True`.
    """

    preview = BooleanProperty(False)
    """
    Shows only image previews.

    :attr:`preview` is an :class:`~kivy.properties.BooleanProperty`
    and defaults to `False`.
    """

    show_hidden_files = BooleanProperty(False)
    """
    Shows hidden files.

    :attr:`show_hidden_files` is an :class:`~kivy.properties.BooleanProperty`
    and defaults to `False`.
    """

    sort_by = OptionProperty(
        "name", options=["nothing", "name", "date", "size", "type"]
    )
    """
    It can take the values 'nothing' 'name' 'date' 'size' 'type' - sorts files
    by option. By default, sort by name. Available options are:
    `'nothing'`, `'name'`, `'date'`, `'size'`, `'type'`.

    :attr:`sort_by` is an :class:`~kivy.properties.OptionProperty`
    and defaults to `name`.
    """

    sort_by_desc = BooleanProperty(False)
    """
    Sort by descending.

    :attr:`sort_by_desc` is an :class:`~kivy.properties.BooleanProperty`
    and defaults to `False`.
    """

    selector = OptionProperty("any", options=["any", "file", "folder", "multi"])
    """
    It can take the values 'any' 'file' 'folder' 'multi'
    By default, any.
    Available options are: `'any'`, `'file'`, `'folder'`, `'multi'`.

    :attr:`selector` is an :class:`~kivy.properties.OptionProperty`
    and defaults to `any`.
    """

    selection = ListProperty()
    """
    Contains the list of files that are currently selected.

    :attr:`selection` is a read-only :class:`~kivy.properties.ListProperty`
    and defaults to `[]`.
    """

    selection_button = ObjectProperty()
    """
    The instance of the directory/path selection button.

    .. versionadded:: 1.1.0

    :attr:`selection_button` is a read-only :class:`~kivy.properties.ObjectProperty`
    and defaults to `None`.
    """

    _window_manager = None
    _window_manager_open = False

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.register_event_type("on_pre_open")
        self.register_event_type("on_open")
        self.register_event_type("on_pre_dismiss")
        self.register_event_type("on_dismiss")

        toolbar_label = self.ids.toolbar.children[1].children[0]
        toolbar_label.font_style = "Subtitle1"
        Clock.schedule_once(self._create_selection_button)

        if self.preview:
            self.ext = [".png", ".jpg", ".jpeg"]
        self.disks = []

    def show_disks(self) -> None:
        if platform == "win":
            self.disks = sorted(
                re.findall(
                    r"[A-Z]+:.*$",
                    os.popen("mountvol /").read(),
                    re.MULTILINE,
                )
            )
        elif platform in ["linux", "android"]:
            self.disks = sorted(
                re.findall(
                    r"on\s(/.*)\stype",
                    os.popen("mount").read(),
                )
            )
        elif platform == "macosx":
            self.disks = sorted(
                re.findall(
                    r"on\s(/.*)\s\(",
                    os.popen("mount").read(),
                )
            )
        else:
            return

        self.current_path = ""
        manager_list = []

        for disk in self.disks:
            access_string = self.get_access_string(disk)
            if "r" not in access_string:
                icon = "harddisk-remove"
            else:
                icon = "harddisk"

            manager_list.append(
                {
                    "viewclass": "BodyManager",
                    "path": disk,
                    "icon": icon,
                    "dir_or_file_name": disk,
                    "events_callback": self.select_dir_or_file,
                    "_selected": False,
                }
            )
        self.ids.rv.data = manager_list
        self._show()

    def show(self, path: str) -> None:
        """
        Forms the body of a directory tree.

        :param path:
            The path to the directory that will be opened in the file manager.
        """

        self.current_path = path
        self.selection = []
        dirs, files = self.get_content()
        manager_list = []

        if dirs == [] and files == []:  # selected directory
            pass
        elif not dirs and not files:  # directory is unavailable
            return

        if self.preview:
            for name_dir in self.__sort_files(dirs):
                manager_list.append(
                    {
                        "viewclass": "BodyManagerWithPreview",
                        "path": self.icon_folder,
                        "realpath": os.path.join(path),
                        "type": "folder",
                        "name": name_dir,
                        "events_callback": self.select_dir_or_file,
                        "height": dp(150),
                        "_selected": False,
                    }
                )
            for name_file in self.__sort_files(files):
                if (
                    os.path.splitext(os.path.join(path, name_file))[1]
                    in self.ext
                ):
                    manager_list.append(
                        {
                            "viewclass": "BodyManagerWithPreview",
                            "path": os.path.join(path, name_file),
                            "name": name_file,
                            "type": "files",
                            "events_callback": self.select_dir_or_file,
                            "height": dp(150),
                            "_selected": False,
                        }
                    )
        else:
            for name in self.__sort_files(dirs):
                _path = os.path.join(path, name)
                access_string = self.get_access_string(_path)
                if "r" not in access_string:
                    icon = "folder-lock"
                else:
                    icon = "folder"

                manager_list.append(
                    {
                        "viewclass": "BodyManager",
                        "path": _path,
                        "icon": icon,
                        "dir_or_file_name": name,
                        "events_callback": self.select_dir_or_file,
                        "icon_color": self.theme_cls.primary_color
                        if not self.icon_color
                        else self.icon_color,
                        "_selected": False,
                    }
                )
            for name in self.__sort_files(files):
                if self.ext and os.path.splitext(name)[1] not in self.ext:
                    continue

                manager_list.append(
                    {
                        "viewclass": "BodyManager",
                        "path": name,
                        "icon": "file-outline",
                        "dir_or_file_name": os.path.split(name)[1],
                        "events_callback": self.select_dir_or_file,
                        "icon_color": self.theme_cls.primary_color
                        if not self.icon_color
                        else self.icon_color,
                        "_selected": False,
                    }
                )
        self.ids.rv.data = manager_list
        self._show()

    def get_access_string(self, path: str) -> str:
        access_string = ""
        if self.use_access:
            access_data = {"r": os.R_OK, "w": os.W_OK, "x": os.X_OK}
            for access in access_data.keys():
                access_string += (
                    access if os.access(path, access_data[access]) else "-"
                )
        return access_string

    def get_content(
        self,
    ) -> Union[Tuple[List[str], List[str]], Tuple[None, None]]:
        """Returns a list of the type [[Folder List], [file list]]."""

        try:
            files = []
            dirs = []

            for content in os.listdir(self.current_path):
                if os.path.isdir(os.path.join(self.current_path, content)):
                    if self.search == "all" or self.search == "dirs":
                        if (not self.show_hidden_files) and (
                            content.startswith(".")
                        ):
                            continue
                        else:
                            dirs.append(content)

                else:
                    if self.search == "all" or self.search == "files":
                        if len(self.ext) != 0:
                            try:
                                files.append(
                                    os.path.join(self.current_path, content)
                                )
                            except IndexError:
                                pass
                        else:
                            if (
                                not self.show_hidden_files
                                and content.startswith(".")
                            ):
                                continue
                            else:
                                files.append(content)

            return dirs, files

        except OSError:
            return None, None

    def close(self) -> None:
        """Closes the file manager window."""

        self.dispatch("on_pre_dismiss")
        self._window_manager.dismiss()
        self.dispatch("on_dismiss")
        self._window_manager_open = False

    def select_dir_or_file(
        self,
        path: str,
        widget: Union[BodyManagerWithPreview, Factory.BodyManager],
    ):
        """Called by tap on the name of the directory or file."""

        if os.path.isfile(os.path.join(self.current_path, path)):
            if self.selector == "multi":
                file_path = os.path.join(self.current_path, path)
                if file_path in self.selection:
                    widget._selected = False
                    self.selection.remove(file_path)
                else:
                    widget._selected = True
                    self.selection.append(file_path)
            elif self.selector == "folder":
                return
            else:
                self.select_path(os.path.join(self.current_path, path))

        else:
            self.current_path = path
            self.show(path)

    def back(self) -> None:
        """Returning to the branch down in the directory tree."""

        path, end = os.path.split(self.current_path)

        if self.current_path and path == self.current_path:
            self.show_disks()
        else:
            if not end:
                self.close()
                self.exit_manager(1)
            else:
                self.show(path)

    def select_directory_on_press_button(self, *args) -> None:
        """Called when a click on a floating button."""

        if self.selector == "multi":
            if len(self.selection) > 0:
                self.select_path(self.selection)
        else:
            if self.selector == "folder" or self.selector == "any":
                self.select_path(self.current_path)

    def on_icon(self, instance_file_manager, icon_name: str) -> None:
        """Called when the :attr:`icon` property is changed."""

        self.icon_selection_button = icon_name

    def on_background_color_toolbar(
        self, instance_file_manager, color: Union[str, list]
    ) -> None:
        """
        Called when the :attr:`background_color_toolbar` property is changed.
        """

        def on_background_color_toolbar(*args):
            self.ids.toolbar.md_bg_color = color

        Clock.schedule_once(on_background_color_toolbar)

    def on_pre_open(self, *args):
        """
        Default pre-open event handler.

        .. versionadded:: 1.1.0
        """

    def on_open(self, *args):
        """
        Default open event handler.

        .. versionadded:: 1.1.0
        """

    def on_pre_dismiss(self, *args):
        """
        Default pre-dismiss event handler.

        .. versionadded:: 1.1.0
        """

    def on_dismiss(self, *args):
        """
        Default dismiss event handler.

        .. versionadded:: 1.1.0
        """

    def _show(self):
        if not self._window_manager:
            self._window_manager = ModalView(
                size_hint=self.size_hint, auto_dismiss=False
            )
            self.size_hint = (1, 1)
            self._window_manager.add_widget(self)

        if not self._window_manager_open:
            self._window_manager.open()
            self._window_manager_open = True

        self.dispatch("on_pre_open")
        self.dispatch("on_open")

    def _create_selection_button(self, *args):
        if (
            self.selector == "any"
            or self.selector == "multi"
            or self.selector == "folder"
        ):
            self.selection_button = MDFloatingActionButton(
                on_release=self.select_directory_on_press_button,
                md_bg_color=self.theme_cls.primary_color
                if not self.background_color_selection_button
                else self.background_color_selection_button,
                icon=self.icon_selection_button,
                pos_hint={"right": 0.99},
                y=dp(12),
                elevation=0,
            )
            self.add_widget(self.selection_button)

    def __sort_files(self, files):
        def sort_by_name(files):
            files.sort(key=locale.strxfrm)
            files.sort(key=str.casefold)
            return files

        if self.sort_by == "name":
            sorted_files = sort_by_name(files)
        elif self.sort_by == "date":
            _files = sort_by_name(files)
            _sorted_files = [os.path.join(self.current_path, f) for f in _files]
            _sorted_files.sort(key=os.path.getmtime, reverse=True)
            sorted_files = [os.path.basename(f) for f in _sorted_files]
        elif self.sort_by == "size":
            _files = sort_by_name(files)
            _sorted_files = [os.path.join(self.current_path, f) for f in _files]
            _sorted_files.sort(key=os.path.getsize, reverse=True)
            sorted_files = [os.path.basename(f) for f in _sorted_files]
        elif self.sort_by == "type":
            _files = sort_by_name(files)
            sorted_files = sorted(
                _files,
                key=lambda f: (os.path.splitext(f)[1], os.path.splitext(f)[0]),
            )
        else:
            sorted_files = files

        if self.sort_by_desc:
            sorted_files.reverse()

        return sorted_files