"""Utilities to create and set the config.

The main class exported by this module is :class:`ManimConfig`.  This class
contains all configuration options, including frame geometry (e.g. frame
height/width, frame rate), output (e.g. directories, logging), styling
(e.g. background color, transparency), and general behavior (e.g. writing a
movie vs writing a single frame).

See :doc:`/tutorials/configuration` for an introduction to Manim's configuration system.

"""
import argparse
import configparser
import copy
import errno
import logging
import os
import re
import sys
import typing
from collections.abc import Mapping, MutableMapping
from pathlib import Path

import colour
import numpy as np

from .. import constants
from ..utils.tex import TexTemplate, TexTemplateFromFile
from ..utils.tex_templates import TexTemplateLibrary
from .logger_utils import set_file_logger


def config_file_paths() -> typing.List[Path]:
    """The paths where ``.cfg`` files will be searched for.

    When manim is first imported, it processes any ``.cfg`` files it finds.  This
    function returns the locations in which these files are searched for.  In
    ascending order of precedence, these are: the library-wide config file, the
    user-wide config file, and the folder-wide config file.

    The library-wide config file determines manim's default behavior.  The
    user-wide config file is stored in the user's home folder, and determines
    the behavior of manim whenever the user invokes it from anywhere in the
    system.  The folder-wide config file only affects scenes that are in the
    same folder.  The latter two files are optional.

    These files, if they exist, are meant to loaded into a single
    :class:`configparser.ConfigParser` object, and then processed by
    :class:`ManimConfig`.

    Returns
    -------
    List[:class:`Path`]
        List of paths which may contain ``.cfg`` files, in ascending order of
        precedence.

    See Also
    --------
    :func:`make_config_parser`, :meth:`ManimConfig.digest_file`,
    :meth:`ManimConfig.digest_parser`

    Notes
    -----
    The location of the user-wide config file is OS-specific.

    """
    library_wide = Path.resolve(Path(__file__).parent / "default.cfg")
    if sys.platform.startswith("win32"):
        user_wide = Path.home() / "AppData" / "Roaming" / "Manim" / "manim.cfg"
    else:
        user_wide = Path.home() / ".config" / "manim" / "manim.cfg"
    folder_wide = Path("manim.cfg")
    return [library_wide, user_wide, folder_wide]


def make_config_parser(custom_file: str = None) -> configparser.ConfigParser:
    """Make a :class:`ConfigParser` object and load any ``.cfg`` files.

    The user-wide file, if it exists, overrides the library-wide file.  The
    folder-wide file, if it exists, overrides the other two.

    The folder-wide file can be ignored by passing ``custom_file``.  However,
    the user-wide and library-wide config files cannot be ignored.

    Parameters
    ----------
    custom_file : :class:`str`
        Path to a custom config file.  If used, the folder-wide file in the
        relevant directory will be ignored, if it exists.  If None, the
        folder-wide file will be used, if it exists.

    Returns
    -------
    :class:`ConfigParser`
        A parser containing the config options found in the .cfg files that
        were found.  It is guaranteed to contain at least the config options
        found in the library-wide file.

    See Also
    --------
    :func:`config_file_paths`

    """
    library_wide, user_wide, folder_wide = config_file_paths()
    # From the documentation: "An application which requires initial values to
    # be loaded from a file should load the required file or files using
    # read_file() before calling read() for any optional files."
    # https://docs.python.org/3/library/configparser.html#configparser.ConfigParser.read
    parser = configparser.ConfigParser()
    with open(library_wide) as file:
        parser.read_file(file)  # necessary file

    other_files = [user_wide, custom_file if custom_file else folder_wide]
    parser.read(other_files)  # optional files

    return parser


def _determine_quality(args: argparse.Namespace) -> str:
    for quality in constants.QUALITIES:
        if quality == constants.DEFAULT_QUALITY:
            # Skip so we prioritize anything that overwrites the default quality.
            pass
        elif getattr(args, quality, None) or (
            hasattr(args, "quality")
            and args.quality is not None
            and args.quality == constants.QUALITIES[quality]["flag"]
        ):
            return quality

    return constants.DEFAULT_QUALITY


class ManimConfig(MutableMapping):
    """Dict-like class storing all config options.

    The global ``config`` object is an instance of this class, and acts as a
    single source of truth for all of the library's customizable behavior.

    The global ``config`` object is capable of digesting different types of
    sources and converting them into a uniform interface.  These sources are
    (in ascending order of precedence): configuration files, command line
    arguments, and programmatic changes.  Regardless of how the user chooses to
    set a config option, she can access its current value using
    :class:`ManimConfig`'s attributes and properties.

    Notes
    -----
    Each config option is implemented as a property of this class.

    Each config option can be set via a config file, using the full name of the
    property.  If a config option has an associated CLI flag, then the flag is
    equal to the full name of the property.  Those that admit an alternative
    flag or no flag at all are documented in the individual property's
    docstring.

    Examples
    --------
    Each config option allows for dict syntax and attribute syntax.  For
    example, the following two lines are equivalent,

    .. code-block:: pycon

        >>> from manim import config, WHITE
        >>> config.background_color = WHITE
        >>> config["background_color"] = WHITE

    The former is preferred; the latter is provided mostly for backwards
    compatibility.

    The config options are designed to keep internal consistency.  For example,
    setting ``frame_y_radius`` will affect ``frame_height``:

    .. code-block:: pycon

        >>> config.frame_height
        8.0
        >>> config.frame_y_radius = 5.0
        >>> config.frame_height
        10.0

    There are many ways of interacting with config options.  Take for example
    the config option ``background_color``.  There are three ways to change it:
    via a config file, via CLI flags, or programmatically.

    To set the background color via a config file, save the following
    ``manim.cfg`` file with the following contents.

    .. code-block::

       [CLI]
       background_color = WHITE

    In order to have this ``.cfg`` file apply to a manim scene, it needs to be
    placed in the same directory as the script,

    .. code-block:: bash

          project/
          ├─scene.py
          └─manim.cfg

    Now, when the user executes

    .. code-block:: bash

        manim scene.py

    the background of the scene will be set to ``WHITE``.  This applies regardless
    of where the manim command is invoked from.

    Command line arguments override ``.cfg`` files.  In the previous example,
    executing

    .. code-block:: bash

        manim scene.py -c BLUE

    will set the background color to BLUE, regardless of the contents of
    ``manim.cfg``.

    Finally, any programmatic changes made within the scene script itself will
    override the command line arguments.  For example, if ``scene.py`` contains
    the following

    .. code-block:: python

        from manim import *

        config.background_color = RED


        class MyScene(Scene):
            ...

    the background color will be set to RED, regardless of the contents of
    ``manim.cfg`` or the CLI arguments used when invoking manim.

    """

    _OPTS = {
        "assets_dir",
        "background_color",
        "background_opacity",
        "custom_folders",
        "disable_caching",
        "ffmpeg_loglevel",
        "format",
        "flush_cache",
        "frame_height",
        "frame_rate",
        "frame_width",
        "frame_x_radius",
        "frame_y_radius",
        "from_animation_number",
        "images_dir",
        "input_file",
        "media_width",
        "webgl_renderer_path",
        "log_dir",
        "log_to_file",
        "max_files_cached",
        "media_dir",
        "movie_file_extension",
        "notify_outdated_version",
        "output_file",
        "partial_movie_dir",
        "pixel_height",
        "pixel_width",
        "plugins",
        "png_mode",
        "preview",
        "progress_bar",
        "save_as_gif",
        "save_last_frame",
        "save_pngs",
        "scene_names",
        "show_in_file_browser",
        "tex_dir",
        "tex_template_file",
        "text_dir",
        "upto_animation_number",
        "renderer",
        "use_opengl_renderer",
        "use_webgl_renderer",
        "enable_gui",
        "gui_location",
        "verbosity",
        "video_dir",
        "write_all",
        "write_to_movie",
    }

    def __init__(self) -> None:
        self._d = {k: None for k in self._OPTS}

    # behave like a dict
    def __iter__(self) -> typing.Iterator[str]:
        return iter(self._d)

    def __len__(self) -> int:
        return len(self._d)

    def __contains__(self, key) -> bool:
        try:
            self.__getitem__(key)
            return True
        except AttributeError:
            return False

    def __getitem__(self, key) -> typing.Any:
        return getattr(self, key)

    def __setitem__(self, key: str, val: typing.Any) -> None:
        getattr(ManimConfig, key).fset(self, val)  # fset is the property's setter

    def update(self, obj: typing.Union["ManimConfig", dict]) -> None:
        """Digest the options found in another :class:`ManimConfig` or in a dict.

        Similar to :meth:`dict.update`, replaces the values of this object with
        those of ``obj``.

        Parameters
        ----------
        obj : Union[:class:`ManimConfig`, :class:`dict`]
            The object to copy values from.

        Returns
        -------
        None

        Raises
        -----
        :class:`AttributeError`
            If ``obj`` is a dict but contains keys that do not belong to any
            config options.

        See Also
        --------
        :meth:`~ManimConfig.digest_file`, :meth:`~ManimConfig.digest_args`,
        :meth:`~ManimConfig.digest_parser`

        """

        if isinstance(obj, ManimConfig):
            self._d.update(obj._d)

        elif isinstance(obj, dict):
            # First update the underlying _d, then update other properties
            _dict = {k: v for k, v in obj.items() if k in self._d}
            for k, v in _dict.items():
                self[k] = v

            _dict = {k: v for k, v in obj.items() if k not in self._d}
            for k, v in _dict.items():
                self[k] = v

    # don't allow to delete anything
    def __delitem__(self, key: str):
        raise AttributeError("'ManimConfig' object does not support item deletion")

    def __delattr__(self, key: str):
        raise AttributeError("'ManimConfig' object does not support item deletion")

    # copy functions
    def copy(self) -> "ManimConfig":
        """Deepcopy the contents of this ManimConfig.

        Returns
        -------
        :class:`ManimConfig`
            A copy of this object containing no shared references.

        See Also
        --------
        :func:`tempconfig`

        Notes
        -----
        This is the main mechanism behind :func:`tempconfig`.

        """
        return copy.deepcopy(self)

    def __copy__(self) -> "ManimConfig":
        """See ManimConfig.copy()."""
        return copy.deepcopy(self)

    def __deepcopy__(self, memo: typing.Dict[str, typing.Any]) -> "ManimConfig":
        """See ManimConfig.copy()."""
        c = ManimConfig()
        # Deepcopying the underlying dict is enough because all properties
        # either read directly from it or compute their value on the fly from
        # values read directly from it.
        c._d = copy.deepcopy(self._d, memo)
        return c

    # helper type-checking methods
    def _set_from_list(self, key: str, val: typing.Any, values: list) -> None:
        """Set ``key`` to ``val`` if ``val`` is contained in ``values``."""
        if val in values:
            self._d[key] = val
        else:
            raise ValueError(f"attempted to set {key} to {val}; must be in {values}")

    def _set_boolean(self, key: typing.Union[str, int], val: typing.Any) -> None:
        """Set ``key`` to ``val`` if ``val`` is Boolean."""
        if val in [True, False]:
            self._d[key] = val
        else:
            raise ValueError(f"{key} must be boolean")

    def _set_tuple(self, key: str, val: tuple) -> None:
        if isinstance(val, tuple):
            self._d[key] = val
        else:
            raise ValueError(f"{key} must be tuple")

    def _set_str(self, key: str, val: typing.Any) -> None:
        """Set ``key`` to ``val`` if ``val`` is a string."""
        if isinstance(val, str):
            self._d[key] = val
        elif not val:
            self._d[key] = ""
        else:
            raise ValueError(f"{key} must be str or falsy value")

    def _set_between(self, key: str, val: float, lo: float, hi: float) -> None:
        """Set ``key`` to ``val`` if lo <= val <= hi."""
        if lo <= val <= hi:
            self._d[key] = val
        else:
            raise ValueError(f"{key} must be {lo} <= {key} <= {hi}")

    def _set_pos_number(self, key: str, val: int, allow_inf: bool) -> None:
        """Set ``key`` to ``val`` if ``val`` is a positive integer."""
        if isinstance(val, int) and val > -1:
            self._d[key] = val
        elif allow_inf and (val == -1 or val == float("inf")):
            self._d[key] = float("inf")
        else:
            raise ValueError(
                f"{key} must be a non-negative integer (use -1 for infinity)"
            )

    def __repr__(self) -> str:
        rep = ""
        for k, v in sorted(self._d.items(), key=lambda x: x[0]):
            rep += f"{k}: {v}, "
        return rep

    # builders
    def digest_parser(self, parser: configparser.ConfigParser) -> "ManimConfig":
        """Process the config options present in a :class:`ConfigParser` object.

        This method processes arbitrary parsers, not only those read from a
        single file, whereas :meth:`~ManimConfig.digest_file` can only process one
        file at a time.

        Parameters
        ----------
        parser : :class:`ConfigParser`
            An object reflecting the contents of one or many ``.cfg`` files.  In
            particular, it may reflect the contents of multiple files that have
            been parsed in a cascading fashion.

        Returns
        -------
        self : :class:`ManimConfig`
            This object, after processing the contents of ``parser``.

        See Also
        --------
        :func:`make_config_parser`, :meth:`~.ManimConfig.digest_file`,
        :meth:`~.ManimConfig.digest_args`,

        Notes
        -----
        If there are multiple ``.cfg`` files to process, it is always more
        efficient to parse them into a single :class:`ConfigParser` object
        first, and then call this function once (instead of calling
        :meth:`~.ManimConfig.digest_file` multiple times).

        Examples
        --------
        To digest the config options set in two files, first create a
        ConfigParser and parse both files and then digest the parser:

        .. code-block:: python

            parser = configparser.ConfigParser()
            parser.read([file1, file2])
            config = ManimConfig().digest_parser(parser)

        In fact, the global ``config`` object is initialized like so:

        .. code-block:: python

            parser = make_config_parser()
            config = ManimConfig().digest_parser(parser)

        """
        self._parser = parser

        # boolean keys
        for key in [
            "notify_outdated_version",
            "write_to_movie",
            "save_last_frame",
            "write_all",
            "save_pngs",
            "save_as_gif",
            "preview",
            "show_in_file_browser",
            "log_to_file",
            "disable_caching",
            "flush_cache",
            "custom_folders",
            "use_opengl_renderer",
            "use_webgl_renderer",
            "enable_gui",
        ]:
            setattr(self, key, parser["CLI"].getboolean(key, fallback=False))

        # int keys
        for key in [
            "from_animation_number",
            "upto_animation_number",
            "max_files_cached",
            # the next two must be set BEFORE digesting frame_width and frame_height
            "pixel_height",
            "pixel_width",
        ]:
            setattr(self, key, parser["CLI"].getint(key))

        # str keys
        for key in [
            "assets_dir",
            "verbosity",
            "media_dir",
            "log_dir",
            "video_dir",
            "images_dir",
            "text_dir",
            "tex_dir",
            "partial_movie_dir",
            "input_file",
            "output_file",
            "png_mode",
            "movie_file_extension",
            "background_color",
            "renderer",
            "webgl_renderer_path",
        ]:
            setattr(self, key, parser["CLI"].get(key, fallback="", raw=True))

        # float keys
        for key in [
            "background_opacity",
            "frame_rate",
            # the next two are floats but have their own logic, applied later
            # "frame_width",
            # "frame_height",
        ]:
            setattr(self, key, parser["CLI"].getfloat(key))

        gui_location = tuple(map(int, re.split(";|,|-", parser["CLI"]["gui_location"])))
        setattr(self, "gui_location", gui_location)

        # plugins
        self.plugins = parser["CLI"].get("plugins", fallback="", raw=True).split(",")
        # the next two must be set AFTER digesting pixel_width and pixel_height
        self["frame_height"] = parser["CLI"].getfloat("frame_height", 8.0)
        width = parser["CLI"].getfloat("frame_width", None)
        if width is None:
            self["frame_width"] = self["frame_height"] * self["aspect_ratio"]
        else:
            self["frame_width"] = width

        # other logic
        val = parser["CLI"].get("tex_template_file")
        if val:
            self.tex_template_file = val

        val = parser["CLI"].get("progress_bar")
        if val:
            setattr(self, "progress_bar", val)

        val = parser["ffmpeg"].get("loglevel")
        if val:
            self.ffmpeg_loglevel = val

        val = parser["jupyter"].get("media_width")
        if val:
            setattr(self, "media_width", val)

        return self

    def digest_args(self, args: argparse.Namespace) -> "ManimConfig":
        """Process the config options present in CLI arguments.

        Parameters
        ----------
        args : :class:`argparse.Namespace`
            An object returned by :func:`.main_utils.parse_args()`.

        Returns
        -------
        self : :class:`ManimConfig`
            This object, after processing the contents of ``parser``.

        See Also
        --------
        :func:`.main_utils.parse_args()`, :meth:`~.ManimConfig.digest_parser`,
        :meth:`~.ManimConfig.digest_file`

        Notes
        -----
        If ``args.config_file`` is a non-empty string, ``ManimConfig`` tries to digest the
        contents of said file with :meth:`~ManimConfig.digest_file` before
        digesting any other CLI arguments.

        """
        # if a config file has been passed, digest it first so that other CLI
        # flags supersede it
        if args.config_file:
            self.digest_file(args.config_file)

        # If args.file is `-`, the animation code has to be taken from STDIN, so the
        # input file path shouldn't be absolute, since that file won't be read.
        self.input_file = Path(args.file).absolute() if args.file != "-" else args.file
        self.scene_names = args.scene_names if args.scene_names is not None else []
        self.output_file = args.output_file

        for key in [
            "notify_outdated_version",
            "preview",
            "show_in_file_browser",
            "write_to_movie",
            "save_last_frame",
            "save_pngs",
            "save_as_gif",
            "write_all",
            "disable_caching",
            "format",
            "flush_cache",
            "progress_bar",
            "transparent",
            "scene_names",
            "verbosity",
            "renderer",
            "background_color",
            "use_opengl_renderer",
            "use_webgl_renderer",
            "enable_gui",
        ]:
            if hasattr(args, key):
                attr = getattr(args, key)
                # if attr is None, then no argument was passed and we should
                # not change the current config
                if attr is not None:
                    self[key] = attr

        # dry_run is special because it can only be set to True
        if hasattr(args, "dry_run"):
            if getattr(args, "dry_run"):
                self["dry_run"] = True

        for key in [
            "media_dir",  # always set this one first
            "log_dir",
            "log_to_file",  # always set this one last
        ]:
            if hasattr(args, key):
                attr = getattr(args, key)
                # if attr is None, then no argument was passed and we should
                # not change the current config
                if attr is not None:
                    self[key] = attr

        if self["save_last_frame"]:
            self["write_to_movie"] = False

        # Handle the -n flag.
        nflag = args.from_animation_number
        if nflag:
            self.from_animation_number = nflag[0]
            try:
                self.upto_animation_number = nflag[1]
            except Exception:
                logging.getLogger("manim").info(
                    f"No end scene number specified in -n option. Rendering from {nflag[0]} onwards..."
                )

        # Handle the quality flags
        self.quality = _determine_quality(args)

        # Handle the -r flag.
        rflag = args.resolution
        if rflag:
            self.pixel_width = int(rflag[0])
            self.pixel_height = int(rflag[1])

        fps = args.frame_rate
        if fps:
            self.frame_rate = float(fps)

        # Handle --custom_folders
        if args.custom_folders:
            for opt in [
                "media_dir",
                "video_dir",
                "images_dir",
                "text_dir",
                "tex_dir",
                "log_dir",
                "partial_movie_dir",
            ]:
                self[opt] = self._parser["custom_folders"].get(opt, raw=True)
            # --media_dir overrides the default.cfg file
            if hasattr(args, "media_dir") and args.media_dir:
                self.media_dir = args.media_dir

        # Handle --tex_template
        if args.tex_template:
            self.tex_template = TexTemplateFromFile(tex_filename=args.tex_template)

        if self.renderer == "opengl":
            if getattr(args, "write_to_movie") is None:
                # --write_to_movie was not passed on the command line, so don't generate video.
                self["write_to_movie"] = False

        # Handle --gui_location flag.
        self.gui_location = args.gui_location

        return self

    def digest_file(self, filename: str) -> "ManimConfig":
        """Process the config options present in a ``.cfg`` file.

        This method processes a single ``.cfg`` file, whereas
        :meth:`~ManimConfig.digest_parser` can process arbitrary parsers, built
        perhaps from multiple ``.cfg`` files.

        Parameters
        ----------
        filename : :class:`str`
            Path to the ``.cfg`` file.

        Returns
        -------
        self : :class:`ManimConfig`
            This object, after processing the contents of ``filename``.

        See Also
        --------
        :meth:`~ManimConfig.digest_file`, :meth:`~ManimConfig.digest_args`,
        :func:`make_config_parser`

        Notes
        -----
        If there are multiple ``.cfg`` files to process, it is always more
        efficient to parse them into a single :class:`ConfigParser` object
        first and digesting them with one call to
        :meth:`~ManimConfig.digest_parser`, instead of calling this method
        multiple times.

        """
        if not os.path.isfile(filename):
            raise FileNotFoundError(
                errno.ENOENT,
                "Error: --config_file could not find a valid config file.",
                filename,
            )

        if filename:
            return self.digest_parser(make_config_parser(filename))

    # config options are properties
    preview = property(
        lambda self: self._d["preview"] or self._d["enable_gui"],
        lambda self, val: self._set_boolean("preview", val),
        doc="Whether to play the rendered movie (-p).",
    )

    show_in_file_browser = property(
        lambda self: self._d["show_in_file_browser"],
        lambda self, val: self._set_boolean("show_in_file_browser", val),
        doc="Whether to show the output file in the file browser (-f).",
    )

    progress_bar = property(
        lambda self: self._d["progress_bar"],
        lambda self, val: self._set_from_list(
            "progress_bar", val, ["none", "display", "leave"]
        ),
        doc="Whether to show progress bars while rendering animations.",
    )

    @property
    def log_to_file(self):
        """Whether to save logs to a file."""
        return self._d["log_to_file"]

    @log_to_file.setter
    def log_to_file(self, val: str) -> None:
        self._set_boolean("log_to_file", val)
        if val:
            log_dir = self.get_dir("log_dir")
            if not os.path.exists(log_dir):
                os.makedirs(log_dir)
            set_file_logger(self, self["verbosity"])

    notify_outdated_version = property(
        lambda self: self._d["notify_outdated_version"],
        lambda self, val: self._set_boolean("notify_outdated_version", val),
        doc="Whether to notify if there is a version update available.",
    )

    write_to_movie = property(
        lambda self: self._d["write_to_movie"],
        lambda self, val: self._set_boolean("write_to_movie", val),
        doc="Whether to render the scene to a movie file (-w).",
    )

    save_last_frame = property(
        lambda self: self._d["save_last_frame"],
        lambda self, val: self._set_boolean("save_last_frame", val),
        doc="Whether to save the last frame of the scene as an image file (-s).",
    )

    write_all = property(
        lambda self: self._d["write_all"],
        lambda self, val: self._set_boolean("write_all", val),
        doc="Whether to render all scenes in the input file (-a).",
    )

    save_pngs = property(
        lambda self: self._d["save_pngs"],
        lambda self, val: self._set_boolean("save_pngs", val),
        doc="Whether to save all frames in the scene as images files (-g).",
    )

    save_as_gif = property(
        lambda self: self._d["save_as_gif"],
        lambda self, val: self._set_boolean("save_as_gif", val),
        doc="Whether to save the rendered scene in .gif format (-i).",
    )

    @property
    def verbosity(self):
        """Logger verbosity; "DEBUG", "INFO", "WARNING", "ERROR", or "CRITICAL" (-v)."""
        return self._d["verbosity"]

    @verbosity.setter
    def verbosity(self, val: str) -> None:
        """Verbosity level of the logger."""
        self._set_from_list(
            "verbosity",
            val,
            ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"],
        )
        logging.getLogger("manim").setLevel(val)

    @property
    def format(self):
        """File format; "png", "gif", "mp4", "webm" or "mov"."""
        return self._d["format"]

    @format.setter
    def format(self, val: str) -> None:
        """File format the renderer will output."""
        self._set_from_list(
            "format",
            val,
            [None, "png", "gif", "mp4", "mov", "webm"],
        )
        if self.format == "webm":
            logging.getLogger("manim").warning(
                "Output format set as webm, this can be slower than other formats"
            )

    ffmpeg_loglevel = property(
        lambda self: self._d["ffmpeg_loglevel"],
        lambda self, val: self._set_from_list(
            "ffmpeg_loglevel", val, ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
        ),
        doc="Verbosity level of ffmpeg (no flag).",
    )

    media_width = property(
        lambda self: self._d["media_width"],
        lambda self, val: self._d.__setitem__("media_width", val),
        doc="Media width in Jupyter notebook",
    )

    pixel_width = property(
        lambda self: self._d["pixel_width"],
        lambda self, val: self._set_pos_number("pixel_width", val, False),
        doc="Frame width in pixels (--resolution, -r).",
    )

    pixel_height = property(
        lambda self: self._d["pixel_height"],
        lambda self, val: self._set_pos_number("pixel_height", val, False),
        doc="Frame height in pixels (--resolution, -r).",
    )

    aspect_ratio = property(
        lambda self: self._d["pixel_width"] / self._d["pixel_height"],
        doc="Aspect ratio (width / height) in pixels (--resolution, -r).",
    )

    frame_height = property(
        lambda self: self._d["frame_height"],
        lambda self, val: self._d.__setitem__("frame_height", val),
        doc="Frame height in logical units (no flag).",
    )

    frame_width = property(
        lambda self: self._d["frame_width"],
        lambda self, val: self._d.__setitem__("frame_width", val),
        doc="Frame width in logical units (no flag).",
    )

    frame_y_radius = property(
        lambda self: self._d["frame_height"] / 2,
        lambda self, val: (
            self._d.__setitem__("frame_y_radius", val)
            or self._d.__setitem__("frame_height", 2 * val)
        ),
        doc="Half the frame height (no flag).",
    )

    frame_x_radius = property(
        lambda self: self._d["frame_width"] / 2,
        lambda self, val: (
            self._d.__setitem__("frame_x_radius", val)
            or self._d.__setitem__("frame_width", 2 * val)
        ),
        doc="Half the frame width (no flag).",
    )

    top = property(
        lambda self: self.frame_y_radius * constants.UP,
        doc="Coordinate at the center top of the frame.",
    )

    bottom = property(
        lambda self: self.frame_y_radius * constants.DOWN,
        doc="Coordinate at the center bottom of the frame.",
    )

    left_side = property(
        lambda self: self.frame_x_radius * constants.LEFT,
        doc="Coordinate at the middle left of the frame.",
    )

    right_side = property(
        lambda self: self.frame_x_radius * constants.RIGHT,
        doc="Coordinate at the middle right of the frame.",
    )

    frame_rate = property(
        lambda self: self._d["frame_rate"],
        lambda self, val: self._d.__setitem__("frame_rate", val),
        doc="Frame rate in frames per second.",
    )

    background_color = property(
        lambda self: self._d["background_color"],
        lambda self, val: self._d.__setitem__("background_color", colour.Color(val)),
        doc="Background color of the scene (-c).",
    )

    from_animation_number = property(
        lambda self: self._d["from_animation_number"],
        lambda self, val: self._d.__setitem__("from_animation_number", val),
        doc="Start rendering animations at this number (-n).",
    )

    upto_animation_number = property(
        lambda self: self._d["upto_animation_number"],
        lambda self, val: self._set_pos_number("upto_animation_number", val, True),
        doc="Stop rendering animations at this nmber.  Use -1 to avoid skipping (-n).",
    )

    max_files_cached = property(
        lambda self: self._d["max_files_cached"],
        lambda self, val: self._set_pos_number("max_files_cached", val, True),
        doc="Maximum number of files cached.  Use -1 for infinity (no flag).",
    )

    flush_cache = property(
        lambda self: self._d["flush_cache"],
        lambda self, val: self._set_boolean("flush_cache", val),
        doc="Whether to delete all the cached partial movie files.",
    )

    disable_caching = property(
        lambda self: self._d["disable_caching"],
        lambda self, val: self._set_boolean("disable_caching", val),
        doc="Whether to use scene caching.",
    )

    png_mode = property(
        lambda self: self._d["png_mode"],
        lambda self, val: self._set_from_list("png_mode", val, ["RGB", "RGBA"]),
        doc="Either RGA (no transparency) or RGBA (with transparency) (no flag).",
    )

    movie_file_extension = property(
        lambda self: self._d["movie_file_extension"],
        lambda self, val: self._set_from_list(
            "movie_file_extension", val, [".mp4", ".mov", ".webm"]
        ),
        doc="Either .mp4, .webm or .mov.",
    )

    background_opacity = property(
        lambda self: self._d["background_opacity"],
        lambda self, val: self._set_between("background_opacity", val, 0, 1),
        doc="A number between 0.0 (fully transparent) and 1.0 (fully opaque).",
    )

    frame_size = property(
        lambda self: (self._d["pixel_width"], self._d["pixel_height"]),
        lambda self, tup: (
            self._d.__setitem__("pixel_width", tup[0])
            or self._d.__setitem__("pixel_height", tup[1])
        ),
        doc="Tuple with (pixel width, pixel height) (no flag).",
    )

    @property
    def quality(self):
        """Video quality (-q)."""
        keys = ["pixel_width", "pixel_height", "frame_rate"]
        q = {k: self[k] for k in keys}
        for qual in constants.QUALITIES:
            if all([q[k] == constants.QUALITIES[qual][k] for k in keys]):
                return qual
        else:
            return None

    @quality.setter
    def quality(self, qual: str) -> None:
        if qual not in constants.QUALITIES:
            raise KeyError(f"quality must be one of {list(constants.QUALITIES.keys())}")
        q = constants.QUALITIES[qual]
        self.frame_size = q["pixel_width"], q["pixel_height"]
        self.frame_rate = q["frame_rate"]

    @property
    def transparent(self):
        """Whether the background opacity is 0.0 (-t)."""
        return self._d["background_opacity"] == 0.0

    @transparent.setter
    def transparent(self, val: bool) -> None:
        if val:
            self.png_mode = "RGBA"
            self.background_opacity = 0.0
        else:
            self.png_mode = "RGB"
            self.background_opacity = 1.0
        self.resolve_movie_file_extension(val)

    @property
    def dry_run(self):
        """Whether dry run is enabled."""
        return (
            self.write_to_movie is False
            and self.write_all is False
            and self.save_last_frame is False
            and self.save_pngs is False
            and self.save_as_gif is False
        )

    @dry_run.setter
    def dry_run(self, val: bool) -> None:
        if val:
            self.write_to_movie = False
            self.write_all = False
            self.save_last_frame = False
            self.save_pngs = False
            self.save_as_gif = False
        else:
            raise ValueError(
                "It is unclear what it means to set dry_run to "
                "False.  Instead, try setting each option "
                "individually. (write_to_movie, write_all, "
                "save_last_frame, save_pngs, or save_as_gif)"
            )

    @property
    def renderer(self):
        """Renderer: "cairo", "opengl", "webgl"""
        return self._d["renderer"]

    @renderer.setter
    def renderer(self, val: str) -> None:
        """Renderer for animations."""
        self._set_from_list(
            "renderer",
            val,
            ["cairo", "opengl", "webgl"],
        )

    @property
    def use_opengl_renderer(self):
        """Whether or not to use the OpenGL renderer."""
        return self._d["use_opengl_renderer"]

    @use_opengl_renderer.setter
    def use_opengl_renderer(self, val: bool) -> None:
        self._d["use_opengl_renderer"] = val
        if val:
            self._set_from_list(
                "renderer",
                "opengl",
                ["cairo", "opengl", "webgl"],
            )

    @property
    def use_webgl_renderer(self):
        """Whether or not to use WebGL renderer."""
        return self._d["use_webgl_renderer"]

    @use_webgl_renderer.setter
    def use_webgl_renderer(self, val: bool) -> None:
        self._d["use_webgl_renderer"] = val
        if val:
            self._set_from_list(
                "renderer",
                "webgl",
                ["cairo", "opengl", "webgl"],
            )
            self["disable_caching"] = True

    webgl_renderer_path = property(
        lambda self: self._d["webgl_renderer_path"],
        lambda self, val: self._d.__setitem__("webgl_renderer_path", val),
        doc="Path to WebGL renderer.",
    )

    media_dir = property(
        lambda self: self._d["media_dir"],
        lambda self, val: self._set_dir("media_dir", val),
        doc="Main output directory.  See :meth:`ManimConfig.get_dir`.",
    )

    def resolve_movie_file_extension(self, is_transparent):
        if is_transparent:
            self.movie_file_extension = ".webm" if self.format == "webm" else ".mov"
        elif self.format == "webm":
            self.movie_file_extension = ".webm"
        elif self.format == "mov":
            self.movie_file_extension = ".mov"
        else:
            self.movie_file_extension = ".mp4"

    enable_gui = property(
        lambda self: self._d["enable_gui"],
        lambda self, val: self._set_boolean("enable_gui", val),
        doc="Enable GUI interaction.",
    )

    gui_location = property(
        lambda self: self._d["gui_location"],
        lambda self, val: self._set_tuple("gui_location", val),
        doc="Enable GUI interaction.",
    )

    def get_dir(self, key: str, **kwargs: str) -> Path:
        """Resolve a config option that stores a directory.

        Config options that store directories may depend on one another.  This
        method is used to provide the actual directory to the end user.

        Parameters
        ----------
        key : :class:`str`
            The config option to be resolved.  Must be an option ending in
            ``'_dir'``, for example ``'media_dir'`` or ``'video_dir'``.

        kwargs : :class:`str`
            Any strings to be used when resolving the directory.

        Returns
        -------
        :class:`pathlib.Path`
            Path to the requested directory.  If the path resolves to the empty
            string, return ``None`` instead.

        Raises
        ------
        :class:`KeyError`
            When ``key`` is not a config option that stores a directory and
            thus :meth:`~ManimConfig.get_dir` is not appropriate; or when
            ``key`` is appropriate but there is not enough information to
            resolve the directory.

        Notes
        -----
        Standard :meth:`str.format` syntax is used to resolve the paths so the
        paths may contain arbitrary placeholders using f-string notation.
        However, these will require ``kwargs`` to contain the required values.

        Examples
        --------

        The value of ``config.tex_dir`` is ``'{media_dir}/Tex'`` by default,
        i.e. it is a subfolder of wherever ``config.media_dir`` is located.  In
        order to get the *actual* directory, use :meth:`~ManimConfig.get_dir`.

        .. code-block:: pycon

            >>> from manim import config
            >>> config.tex_dir
            '{media_dir}/Tex'
            >>> config.media_dir
            './media'
            >>> config.get_dir("tex_dir").as_posix()
            'media/Tex'

        Resolving directories is done in a lazy way, at the last possible
        moment, to reflect any changes in other config options:

        .. code-block:: pycon

            >>> config.media_dir = "my_media_dir"
            >>> config.get_dir("tex_dir").as_posix()
            'my_media_dir/Tex'

        Some directories depend on information that is not available to
        :class:`ManimConfig`. For example, the default value of `video_dir`
        includes the name of the input file and the video quality
        (e.g. 480p15). This informamtion has to be supplied via ``kwargs``:

        .. code-block:: pycon

            >>> config.video_dir
            '{media_dir}/videos/{module_name}/{quality}'
            >>> config.get_dir("video_dir")
            Traceback (most recent call last):
            KeyError: 'video_dir {media_dir}/videos/{module_name}/{quality} requires the following keyword arguments: module_name'
            >>> config.get_dir("video_dir", module_name="myfile").as_posix()
            'my_media_dir/videos/myfile/1080p60.0'

        Note the quality does not need to be passed as keyword argument since
        :class:`ManimConfig` does store information about quality.

        Directories may be recursively defined.  For example, the config option
        ``partial_movie_dir`` depends on ``video_dir``, which in turn depends
        on ``media_dir``:

        .. code-block:: pycon

            >>> config.partial_movie_dir
            '{video_dir}/partial_movie_files/{scene_name}'
            >>> config.get_dir("partial_movie_dir")
            Traceback (most recent call last):
            KeyError: 'partial_movie_dir {video_dir}/partial_movie_files/{scene_name} requires the following keyword arguments: scene_name'
            >>> config.get_dir(
            ...     "partial_movie_dir", module_name="myfile", scene_name="myscene"
            ... ).as_posix()
            'my_media_dir/videos/myfile/1080p60.0/partial_movie_files/myscene'

        Standard f-string syntax is used.  Arbitrary names can be used when
        defining directories, as long as the corresponding values are passed to
        :meth:`ManimConfig.get_dir` via ``kwargs``.

        .. code-block:: pycon

            >>> config.media_dir = "{dir1}/{dir2}"
            >>> config.get_dir("media_dir")
            Traceback (most recent call last):
            KeyError: 'media_dir {dir1}/{dir2} requires the following keyword arguments: dir1'
            >>> config.get_dir("media_dir", dir1="foo", dir2="bar").as_posix()
            'foo/bar'
            >>> config.media_dir = "./media"
            >>> config.get_dir("media_dir").as_posix()
            'media'

        """
        dirs = [
            "assets_dir",
            "media_dir",
            "video_dir",
            "images_dir",
            "text_dir",
            "tex_dir",
            "log_dir",
            "input_file",
            "output_file",
            "partial_movie_dir",
        ]
        if key not in dirs:
            raise KeyError(
                "must pass one of "
                "{media,video,images,text,tex,log}_dir "
                "or {input,output}_file"
            )

        dirs.remove(key)  # a path cannot contain itself

        all_args = {k: self._d[k] for k in dirs}
        all_args.update(kwargs)
        all_args["quality"] = f"{self.pixel_height}p{self.frame_rate}"

        path = self._d[key]
        while "{" in path:
            try:
                path = path.format(**all_args)
            except KeyError as exc:
                raise KeyError(
                    f"{key} {self._d[key]} requires the following "
                    + "keyword arguments: "
                    + " ".join(exc.args)
                ) from exc
        return Path(path) if path else None

    def _set_dir(self, key: str, val: typing.Union[str, Path]):
        if isinstance(val, Path):
            self._d.__setitem__(key, str(val))
        else:
            self._d.__setitem__(key, val)

    assets_dir = property(
        lambda self: self._d["assets_dir"],
        lambda self, val: self._set_dir("assets_dir", val),
        doc="Directory to locate video assets (no flag).",
    )

    log_dir = property(
        lambda self: self._d["log_dir"],
        lambda self, val: self._set_dir("log_dir", val),
        doc="Directory to place logs.  See :meth:`ManimConfig.get_dir`.",
    )

    video_dir = property(
        lambda self: self._d["video_dir"],
        lambda self, val: self._set_dir("video_dir", val),
        doc="Directory to place videos (no flag).  See :meth:`ManimConfig.get_dir`.",
    )

    images_dir = property(
        lambda self: self._d["images_dir"],
        lambda self, val: self._set_dir("images_dir", val),
        doc="Directory to place images (no flag).  See :meth:`ManimConfig.get_dir`.",
    )

    text_dir = property(
        lambda self: self._d["text_dir"],
        lambda self, val: self._set_dir("text_dir", val),
        doc="Directory to place text (no flag).  See :meth:`ManimConfig.get_dir`.",
    )

    tex_dir = property(
        lambda self: self._d["tex_dir"],
        lambda self, val: self._set_dir("tex_dir", val),
        doc="Directory to place tex (no flag).  See :meth:`ManimConfig.get_dir`.",
    )

    partial_movie_dir = property(
        lambda self: self._d["partial_movie_dir"],
        lambda self, val: self._set_dir("partial_movie_dir", val),
        doc="Directory to place partial movie files (no flag).  See :meth:`ManimConfig.get_dir`.",
    )

    custom_folders = property(
        lambda self: self._d["custom_folders"],
        lambda self, val: self._set_boolean("custom_folders", val),
        doc="Whether to use custom folder output.",
    )

    input_file = property(
        lambda self: self._d["input_file"],
        lambda self, val: self._set_dir("input_file", val),
        doc="Input file name.",
    )

    output_file = property(
        lambda self: self._d["output_file"],
        lambda self, val: self._set_dir("output_file", val),
        doc="Output file name (-o).",
    )

    scene_names = property(
        lambda self: self._d["scene_names"],
        lambda self, val: self._d.__setitem__("scene_names", val),
        doc="Scenes to play from file.",
    )

    @property
    def tex_template(self):
        """Template used when rendering Tex.  See :class:`.TexTemplate`."""
        if not hasattr(self, "_tex_template") or not self._tex_template:
            fn = self._d["tex_template_file"]
            if fn:
                self._tex_template = TexTemplateFromFile(filename=fn)
            else:
                self._tex_template = TexTemplateLibrary.default.copy()
        return self._tex_template

    @tex_template.setter
    def tex_template(self, val: typing.Union[TexTemplateFromFile, TexTemplate]) -> None:
        if isinstance(val, (TexTemplateFromFile, TexTemplate)):
            self._tex_template = val

    @property
    def tex_template_file(self):
        """File to read Tex template from (no flag).  See :class:`.TexTemplateFromFile`."""
        return self._d["tex_template_file"]

    @tex_template_file.setter
    def tex_template_file(self, val: str) -> None:
        if val:
            if not os.access(val, os.R_OK):
                logging.getLogger("manim").warning(
                    f"Custom TeX template {val} not found or not readable."
                )
            else:
                self._d["tex_template_file"] = Path(val)
                self._tex_template = TexTemplateFromFile(filename=val)
        else:
            self._d["tex_template_file"] = val  # actually set the falsy value
            self._tex_template = TexTemplate()  # but don't use it

    @property
    def plugins(self):
        """List of plugins to enable."""
        return self._d["plugins"]

    @plugins.setter
    def plugins(self, value):
        self._d["plugins"] = value


class ManimFrame(Mapping):
    _OPTS: typing.Set[str] = {
        "pixel_width",
        "pixel_height",
        "aspect_ratio",
        "frame_height",
        "frame_width",
        "frame_y_radius",
        "frame_x_radius",
        "top",
        "bottom",
        "left_side",
        "right_side",
    }
    _CONSTANTS: typing.Dict[str, np.ndarray] = {
        "UP": np.array((0.0, 1.0, 0.0)),
        "DOWN": np.array((0.0, -1.0, 0.0)),
        "RIGHT": np.array((1.0, 0.0, 0.0)),
        "LEFT": np.array((-1.0, 0.0, 0.0)),
        "IN": np.array((0.0, 0.0, -1.0)),
        "OUT": np.array((0.0, 0.0, 1.0)),
        "ORIGIN": np.array((0.0, 0.0, 0.0)),
        "X_AXIS": np.array((1.0, 0.0, 0.0)),
        "Y_AXIS": np.array((0.0, 1.0, 0.0)),
        "Z_AXIS": np.array((0.0, 0.0, 1.0)),
        "UL": np.array((-1.0, 1.0, 0.0)),
        "UR": np.array((1.0, 1.0, 0.0)),
        "DL": np.array((-1.0, -1.0, 0.0)),
        "DR": np.array((1.0, -1.0, 0.0)),
    }

    def __init__(self, c: ManimConfig) -> None:
        if not isinstance(c, ManimConfig):
            raise TypeError("argument must be instance of 'ManimConfig'")
        # need to use __dict__ directly because setting attributes is not
        # allowed (see __setattr__)
        self.__dict__["_c"] = c

    # there are required by parent class Mapping to behave like a dict
    def __getitem__(self, key: typing.Union[str, int]) -> typing.Any:
        if key in self._OPTS:
            return self._c[key]
        elif key in self._CONSTANTS:
            return self._CONSTANTS[key]
        else:
            raise KeyError(key)

    def __iter__(self) -> typing.Iterable:
        return iter(list(self._OPTS) + list(self._CONSTANTS))

    def __len__(self) -> int:
        return len(self._OPTS)

    # make this truly immutable
    def __setattr__(self, attr, val) -> None:
        raise TypeError("'ManimFrame' object does not support item assignment")

    def __setitem__(self, key, val) -> None:
        raise TypeError("'ManimFrame' object does not support item assignment")

    def __delitem__(self, key) -> None:
        raise TypeError("'ManimFrame' object does not support item deletion")


for opt in list(ManimFrame._OPTS) + list(ManimFrame._CONSTANTS):
    setattr(ManimFrame, opt, property(lambda self, o=opt: self[o]))
