from operator import itemgetter
from typing import TYPE_CHECKING, Callable, NamedTuple, Optional, Sequence

from . import errors
from .protocol import is_renderable, rich_cast

if TYPE_CHECKING:
    from .console import Console, ConsoleOptions, RenderableType


class Measurement(NamedTuple):
    """Stores the minimum and maximum widths (in characters) required to render an object."""

    minimum: int
    """Minimum number of cells required to render."""
    maximum: int
    """Maximum number of cells required to render."""

    @property
    def span(self) -> int:
        """Get difference between maximum and minimum."""
        return self.maximum - self.minimum

    def normalize(self) -> "Measurement":
        """Get measurement that ensures that minimum <= maximum and minimum >= 0

        Returns:
            Measurement: A normalized measurement.
        """
        minimum, maximum = self
        minimum = min(max(0, minimum), maximum)
        return Measurement(max(0, minimum), max(0, max(minimum, maximum)))

    def with_maximum(self, width: int) -> "Measurement":
        """Get a RenderableWith where the widths are <= width.

        Args:
            width (int): Maximum desired width.

        Returns:
            Measurement: New Measurement object.
        """
        minimum, maximum = self
        return Measurement(min(minimum, width), min(maximum, width))

    def with_minimum(self, width: int) -> "Measurement":
        """Get a RenderableWith where the widths are >= width.

        Args:
            width (int): Minimum desired width.

        Returns:
            Measurement: New Measurement object.
        """
        minimum, maximum = self
        width = max(0, width)
        return Measurement(max(minimum, width), max(maximum, width))

    def clamp(
        self, min_width: Optional[int] = None, max_width: Optional[int] = None
    ) -> "Measurement":
        """Clamp a measurement within the specified range.

        Args:
            min_width (int): Minimum desired width, or ``None`` for no minimum. Defaults to None.
            max_width (int): Maximum desired width, or ``None`` for no maximum. Defaults to None.

        Returns:
            Measurement: New Measurement object.
        """
        measurement = self
        if min_width is not None:
            measurement = measurement.with_minimum(min_width)
        if max_width is not None:
            measurement = measurement.with_maximum(max_width)
        return measurement

    @classmethod
    def get(
        cls, console: "Console", options: "ConsoleOptions", renderable: "RenderableType"
    ) -> "Measurement":
        """Get a measurement for a renderable.

        Args:
            console (~rich.console.Console): Console instance.
            options (~rich.console.ConsoleOptions): Console options.
            renderable (RenderableType): An object that may be rendered with Rich.

        Raises:
            errors.NotRenderableError: If the object is not renderable.

        Returns:
            Measurement: Measurement object containing range of character widths required to render the object.
        """
        _max_width = options.max_width
        if _max_width < 1:
            return Measurement(0, 0)
        if isinstance(renderable, str):
            renderable = console.render_str(
                renderable, markup=options.markup, highlight=False
            )
        renderable = rich_cast(renderable)
        if is_renderable(renderable):
            get_console_width: Optional[
                Callable[["Console", "ConsoleOptions"], "Measurement"]
            ] = getattr(renderable, "__rich_measure__", None)
            if get_console_width is not None:
                render_width = (
                    get_console_width(console, options)
                    .normalize()
                    .with_maximum(_max_width)
                )
                if render_width.maximum < 1:
                    return Measurement(0, 0)
                return render_width.normalize()
            else:
                return Measurement(0, _max_width)
        else:
            raise errors.NotRenderableError(
                f"Unable to get render width for {renderable!r}; "
                "a str, Segment, or object with __rich_console__ method is required"
            )


def measure_renderables(
    console: "Console",
    options: "ConsoleOptions",
    renderables: Sequence["RenderableType"],
) -> "Measurement":
    """Get a measurement that would fit a number of renderables.

    Args:
        console (~rich.console.Console): Console instance.
        options (~rich.console.ConsoleOptions): Console options.
        renderables (Iterable[RenderableType]): One or more renderable objects.

    Returns:
        Measurement: Measurement object containing range of character widths required to
            contain all given renderables.
    """
    if not renderables:
        return Measurement(0, 0)
    get_measurement = Measurement.get
    measurements = [
        get_measurement(console, options, renderable) for renderable in renderables
    ]
    measured_width = Measurement(
        max(measurements, key=itemgetter(0)).minimum,
        max(measurements, key=itemgetter(1)).maximum,
    )
    return measured_width

from __future__ import absolute_import

import sys

from .filepost import encode_multipart_formdata
from .packages import six
from .packages.six.moves.urllib.parse import urlencode

__all__ = ["RequestMethods"]


class RequestMethods(object):
    """
    Convenience mixin for classes who implement a :meth:`urlopen` method, such
    as :class:`urllib3.HTTPConnectionPool` and
    :class:`urllib3.PoolManager`.

    Provides behavior for making common types of HTTP request methods and
    decides which type of request field encoding to use.

    Specifically,

    :meth:`.request_encode_url` is for sending requests whose fields are
    encoded in the URL (such as GET, HEAD, DELETE).

    :meth:`.request_encode_body` is for sending requests whose fields are
    encoded in the *body* of the request using multipart or www-form-urlencoded
    (such as for POST, PUT, PATCH).

    :meth:`.request` is for making any kind of request, it will look up the
    appropriate encoding format and use one of the above two methods to make
    the request.

    Initializer parameters:

    :param headers:
        Headers to include with all requests, unless other headers are given
        explicitly.
    """

    _encode_url_methods = {"DELETE", "GET", "HEAD", "OPTIONS"}

    def __init__(self, headers=None):
        self.headers = headers or {}

    def urlopen(
        self,
        method,
        url,
        body=None,
        headers=None,
        encode_multipart=True,
        multipart_boundary=None,
        **kw
    ):  # Abstract
        raise NotImplementedError(
            "Classes extending RequestMethods must implement "
            "their own ``urlopen`` method."
        )

    def request(self, method, url, fields=None, headers=None, **urlopen_kw):
        """
        Make a request using :meth:`urlopen` with the appropriate encoding of
        ``fields`` based on the ``method`` used.

        This is a convenience method that requires the least amount of manual
        effort. It can be used in most situations, while still having the
        option to drop down to more specific methods when necessary, such as
        :meth:`request_encode_url`, :meth:`request_encode_body`,
        or even the lowest level :meth:`urlopen`.
        """
        method = method.upper()

        urlopen_kw["request_url"] = url

        if method in self._encode_url_methods:
            return self.request_encode_url(
                method, url, fields=fields, headers=headers, **urlopen_kw
            )
        else:
            return self.request_encode_body(
                method, url, fields=fields, headers=headers, **urlopen_kw
            )

    def request_encode_url(self, method, url, fields=None, headers=None, **urlopen_kw):
        """
        Make a request using :meth:`urlopen` with the ``fields`` encoded in
        the url. This is useful for request methods like GET, HEAD, DELETE, etc.
        """
        if headers is None:
            headers = self.headers

        extra_kw = {"headers": headers}
        extra_kw.update(urlopen_kw)

        if fields:
            url += "?" + urlencode(fields)

        return self.urlopen(method, url, **extra_kw)

    def request_encode_body(
        self,
        method,
        url,
        fields=None,
        headers=None,
        encode_multipart=True,
        multipart_boundary=None,
        **urlopen_kw
    ):
        """
        Make a request using :meth:`urlopen` with the ``fields`` encoded in
        the body. This is useful for request methods like POST, PUT, PATCH, etc.

        When ``encode_multipart=True`` (default), then
        :func:`urllib3.encode_multipart_formdata` is used to encode
        the payload with the appropriate content type. Otherwise
        :func:`urllib.parse.urlencode` is used with the
        'application/x-www-form-urlencoded' content type.

        Multipart encoding must be used when posting files, and it's reasonably
        safe to use it in other times too. However, it may break request
        signing, such as with OAuth.

        Supports an optional ``fields`` parameter of key/value strings AND
        key/filetuple. A filetuple is a (filename, data, MIME type) tuple where
        the MIME type is optional. For example::

            fields = {
                'foo': 'bar',
                'fakefile': ('foofile.txt', 'contents of foofile'),
                'realfile': ('barfile.txt', open('realfile').read()),
                'typedfile': ('bazfile.bin', open('bazfile').read(),
                              'image/jpeg'),
                'nonamefile': 'contents of nonamefile field',
            }

        When uploading a file, providing a filename (the first parameter of the
        tuple) is optional but recommended to best mimic behavior of browsers.

        Note that if ``headers`` are supplied, the 'Content-Type' header will
        be overwritten because it depends on the dynamic random boundary string
        which is used to compose the body of the request. The random boundary
        string can be explicitly set with the ``multipart_boundary`` parameter.
        """
        if headers is None:
            headers = self.headers

        extra_kw = {"headers": {}}

        if fields:
            if "body" in urlopen_kw:
                raise TypeError(
                    "request got values for both 'fields' and 'body', can only specify one."
                )

            if encode_multipart:
                body, content_type = encode_multipart_formdata(
                    fields, boundary=multipart_boundary
                )
            else:
                body, content_type = (
                    urlencode(fields),
                    "application/x-www-form-urlencoded",
                )

            extra_kw["body"] = body
            extra_kw["headers"] = {"Content-Type": content_type}

        extra_kw["headers"].update(headers)
        extra_kw.update(urlopen_kw)

        return self.urlopen(method, url, **extra_kw)


if not six.PY2:

    class RequestModule(sys.modules[__name__].__class__):
        def __call__(self, *args, **kwargs):
            """
            If user tries to call this module directly urllib3 v2.x style raise an error to the user
            suggesting they may need urllib3 v2
            """
            raise TypeError(
                "'module' object is not callable\n"
                "urllib3.request() method is not supported in this release, "
                "upgrade to urllib3 v2 to use it\n"
                "see https://urllib3.readthedocs.io/en/stable/v2-migration-guide.html"
            )

    sys.modules[__name__].__class__ = RequestModule

from typing import Any, Generic, List, Optional, TextIO, TypeVar, Union, overload

from . import get_console
from .console import Console
from .text import Text, TextType

PromptType = TypeVar("PromptType")
DefaultType = TypeVar("DefaultType")


class PromptError(Exception):
    """Exception base class for prompt related errors."""


class InvalidResponse(PromptError):
    """Exception to indicate a response was invalid. Raise this within process_response() to indicate an error
    and provide an error message.

    Args:
        message (Union[str, Text]): Error message.
    """

    def __init__(self, message: TextType) -> None:
        self.message = message

    def __rich__(self) -> TextType:
        return self.message


class PromptBase(Generic[PromptType]):
    """Ask the user for input until a valid response is received. This is the base class, see one of
    the concrete classes for examples.

    Args:
        prompt (TextType, optional): Prompt text. Defaults to "".
        console (Console, optional): A Console instance or None to use global console. Defaults to None.
        password (bool, optional): Enable password input. Defaults to False.
        choices (List[str], optional): A list of valid choices. Defaults to None.
        show_default (bool, optional): Show default in prompt. Defaults to True.
        show_choices (bool, optional): Show choices in prompt. Defaults to True.
    """

    response_type: type = str

    validate_error_message = "[prompt.invalid]Please enter a valid value"
    illegal_choice_message = (
        "[prompt.invalid.choice]Please select one of the available options"
    )
    prompt_suffix = ": "

    choices: Optional[List[str]] = None

    def __init__(
        self,
        prompt: TextType = "",
        *,
        console: Optional[Console] = None,
        password: bool = False,
        choices: Optional[List[str]] = None,
        show_default: bool = True,
        show_choices: bool = True,
    ) -> None:
        self.console = console or get_console()
        self.prompt = (
            Text.from_markup(prompt, style="prompt")
            if isinstance(prompt, str)
            else prompt
        )
        self.password = password
        if choices is not None:
            self.choices = choices
        self.show_default = show_default
        self.show_choices = show_choices

    @classmethod
    @overload
    def ask(
        cls,
        prompt: TextType = "",
        *,
        console: Optional[Console] = None,
        password: bool = False,
        choices: Optional[List[str]] = None,
        show_default: bool = True,
        show_choices: bool = True,
        default: DefaultType,
        stream: Optional[TextIO] = None,
    ) -> Union[DefaultType, PromptType]:
        ...

    @classmethod
    @overload
    def ask(
        cls,
        prompt: TextType = "",
        *,
        console: Optional[Console] = None,
        password: bool = False,
        choices: Optional[List[str]] = None,
        show_default: bool = True,
        show_choices: bool = True,
        stream: Optional[TextIO] = None,
    ) -> PromptType:
        ...

    @classmethod
    def ask(
        cls,
        prompt: TextType = "",
        *,
        console: Optional[Console] = None,
        password: bool = False,
        choices: Optional[List[str]] = None,
        show_default: bool = True,
        show_choices: bool = True,
        default: Any = ...,
        stream: Optional[TextIO] = None,
    ) -> Any:
        """Shortcut to construct and run a prompt loop and return the result.

        Example:
            >>> filename = Prompt.ask("Enter a filename")

        Args:
            prompt (TextType, optional): Prompt text. Defaults to "".
            console (Console, optional): A Console instance or None to use global console. Defaults to None.
            password (bool, optional): Enable password input. Defaults to False.
            choices (List[str], optional): A list of valid choices. Defaults to None.
            show_default (bool, optional): Show default in prompt. Defaults to True.
            show_choices (bool, optional): Show choices in prompt. Defaults to True.
            stream (TextIO, optional): Optional text file open for reading to get input. Defaults to None.
        """
        _prompt = cls(
            prompt,
            console=console,
            password=password,
            choices=choices,
            show_default=show_default,
            show_choices=show_choices,
        )
        return _prompt(default=default, stream=stream)

    def render_default(self, default: DefaultType) -> Text:
        """Turn the supplied default in to a Text instance.

        Args:
            default (DefaultType): Default value.

        Returns:
            Text: Text containing rendering of default value.
        """
        return Text(f"({default})", "prompt.default")

    def make_prompt(self, default: DefaultType) -> Text:
        """Make prompt text.

        Args:
            default (DefaultType): Default value.

        Returns:
            Text: Text to display in prompt.
        """
        prompt = self.prompt.copy()
        prompt.end = ""

        if self.show_choices and self.choices:
            _choices = "/".join(self.choices)
            choices = f"[{_choices}]"
            prompt.append(" ")
            prompt.append(choices, "prompt.choices")

        if (
            default != ...
            and self.show_default
            and isinstance(default, (str, self.response_type))
        ):
            prompt.append(" ")
            _default = self.render_default(default)
            prompt.append(_default)

        prompt.append(self.prompt_suffix)

        return prompt

    @classmethod
    def get_input(
        cls,
        console: Console,
        prompt: TextType,
        password: bool,
        stream: Optional[TextIO] = None,
    ) -> str:
        """Get input from user.

        Args:
            console (Console): Console instance.
            prompt (TextType): Prompt text.
            password (bool): Enable password entry.

        Returns:
            str: String from user.
        """
        return console.input(prompt, password=password, stream=stream)

    def check_choice(self, value: str) -> bool:
        """Check value is in the list of valid choices.

        Args:
            value (str): Value entered by user.

        Returns:
            bool: True if choice was valid, otherwise False.
        """
        assert self.choices is not None
        return value.strip() in self.choices

    def process_response(self, value: str) -> PromptType:
        """Process response from user, convert to prompt type.

        Args:
            value (str): String typed by user.

        Raises:
            InvalidResponse: If ``value`` is invalid.

        Returns:
            PromptType: The value to be returned from ask method.
        """
        value = value.strip()
        try:
            return_value: PromptType = self.response_type(value)
        except ValueError:
            raise InvalidResponse(self.validate_error_message)

        if self.choices is not None and not self.check_choice(value):
            raise InvalidResponse(self.illegal_choice_message)

        return return_value

    def on_validate_error(self, value: str, error: InvalidResponse) -> None:
        """Called to handle validation error.

        Args:
            value (str): String entered by user.
            error (InvalidResponse): Exception instance the initiated the error.
        """
        self.console.print(error)

    def pre_prompt(self) -> None:
        """Hook to display something before the prompt."""

    @overload
    def __call__(self, *, stream: Optional[TextIO] = None) -> PromptType:
        ...

    @overload
    def __call__(
        self, *, default: DefaultType, stream: Optional[TextIO] = None
    ) -> Union[PromptType, DefaultType]:
        ...

    def __call__(self, *, default: Any = ..., stream: Optional[TextIO] = None) -> Any:
        """Run the prompt loop.

        Args:
            default (Any, optional): Optional default value.

        Returns:
            PromptType: Processed value.
        """
        while True:
            self.pre_prompt()
            prompt = self.make_prompt(default)
            value = self.get_input(self.console, prompt, self.password, stream=stream)
            if value == "" and default != ...:
                return default
            try:
                return_value = self.process_response(value)
            except InvalidResponse as error:
                self.on_validate_error(value, error)
                continue
            else:
                return return_value


class Prompt(PromptBase[str]):
    """A prompt that returns a str.

    Example:
        >>> name = Prompt.ask("Enter your name")


    """

    response_type = str


class IntPrompt(PromptBase[int]):
    """A prompt that returns an integer.

    Example:
        >>> burrito_count = IntPrompt.ask("How many burritos do you want to order")

    """

    response_type = int
    validate_error_message = "[prompt.invalid]Please enter a valid integer number"


class FloatPrompt(PromptBase[float]):
    """A prompt that returns a float.

    Example:
        >>> temperature = FloatPrompt.ask("Enter desired temperature")

    """

    response_type = float
    validate_error_message = "[prompt.invalid]Please enter a number"


class Confirm(PromptBase[bool]):
    """A yes / no confirmation prompt.

    Example:
        >>> if Confirm.ask("Continue"):
                run_job()

    """

    response_type = bool
    validate_error_message = "[prompt.invalid]Please enter Y or N"
    choices: List[str] = ["y", "n"]

    def render_default(self, default: DefaultType) -> Text:
        """Render the default as (y) or (n) rather than True/False."""
        yes, no = self.choices
        return Text(f"({yes})" if default else f"({no})", style="prompt.default")

    def process_response(self, value: str) -> bool:
        """Convert choices to a bool."""
        value = value.strip().lower()
        if value not in self.choices:
            raise InvalidResponse(self.validate_error_message)
        return value == self.choices[0]


if __name__ == "__main__":  # pragma: no cover
    from pip._vendor.rich import print

    if Confirm.ask("Run [i]prompt[/i] tests?", default=True):
        while True:
            result = IntPrompt.ask(
                ":rocket: Enter a number between [b]1[/b] and [b]10[/b]", default=5
            )
            if result >= 1 and result <= 10:
                break
            print(":pile_of_poo: [prompt.invalid]Number must be between 1 and 10")
        print(f"number={result}")

        while True:
            password = Prompt.ask(
                "Please enter a password [cyan](must be at least 5 characters)",
                password=True,
            )
            if len(password) >= 5:
                break
            print("[prompt.invalid]password too short")
        print(f"password={password!r}")

        fruit = Prompt.ask("Enter a fruit", choices=["apple", "orange", "pear"])
        print(f"fruit={fruit!r}")

    else:
        print("[b]OK :loudly_crying_face:")

from .default_styles import DEFAULT_STYLES
from .theme import Theme


DEFAULT = Theme(DEFAULT_STYLES)