# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2024)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import annotations

import numbers
from dataclasses import dataclass
from textwrap import dedent
from typing import TYPE_CHECKING, Literal, TypeVar, Union, cast, overload

from typing_extensions import TypeAlias

from streamlit.elements.lib.form_utils import current_form_id
from streamlit.elements.lib.js_number import JSNumber, JSNumberBoundsException
from streamlit.elements.lib.policies import (
    check_widget_policies,
    maybe_raise_label_warnings,
)
from streamlit.elements.lib.utils import (
    Key,
    LabelVisibility,
    compute_and_register_element_id,
    get_label_visibility_proto_value,
    to_key,
)
from streamlit.errors import (
    StreamlitInvalidNumberFormatError,
    StreamlitJSNumberBoundsError,
    StreamlitMixedNumericTypesError,
    StreamlitValueAboveMaxError,
    StreamlitValueBelowMinError,
)
from streamlit.proto.NumberInput_pb2 import NumberInput as NumberInputProto
from streamlit.runtime.metrics_util import gather_metrics
from streamlit.runtime.scriptrunner import ScriptRunContext, get_script_run_ctx
from streamlit.runtime.state import (
    WidgetArgs,
    WidgetCallback,
    WidgetKwargs,
    get_session_state,
    register_widget,
)

if TYPE_CHECKING:
    from streamlit.delta_generator import DeltaGenerator


Number: TypeAlias = Union[int, float]
IntOrNone = TypeVar("IntOrNone", int, None)
FloatOrNone = TypeVar("FloatOrNone", float, None)


@dataclass
class NumberInputSerde:
    value: Number | None
    data_type: int

    def serialize(self, v: Number | None) -> Number | None:
        return v

    def deserialize(
        self, ui_value: Number | None, widget_id: str = ""
    ) -> Number | None:
        val: Number | None = ui_value if ui_value is not None else self.value

        if val is not None and self.data_type == NumberInputProto.INT:
            val = int(val)

        return val


class NumberInputMixin:
    # For easier readability, all the arguments with un-changing types across these overload signatures have been
    # collapsed onto a single line.

    # fmt: off
    # If "min_value: int" is given and all other numerical inputs are
    #   "int"s or not provided (value optionally being "min"), return "int"
    # If "min_value: int, value: None" is given and all other numerical inputs
    #   are "int"s or not provided, return "int | None"
    @overload
    def number_input(
        self,
        label: str,
        min_value: int,
        max_value: int | None = None,
        value: IntOrNone | Literal["min"] = "min",
        step: int | None = None,
        format: str | None = None, key: Key | None = None, help: str | None = None, on_change: WidgetCallback | None = None, args: WidgetArgs | None = None, kwargs: WidgetKwargs | None = None, *, placeholder: str | None = None, disabled: bool = False, label_visibility: LabelVisibility = "visible"
    ) -> int | IntOrNone:
        ...

    # If "max_value: int" is given and all other numerical inputs are
    #   "int"s or not provided (value optionally being "min"), return "int"
    # If "max_value: int, value=None" is given and all other numerical inputs
    #   are "int"s or not provided, return "int | None"
    @overload
    def number_input(
        self,
        label: str,
        min_value: int | None = None,
        *,
        max_value: int,
        value: IntOrNone | Literal["min"] = "min",
        step: int | None = None,
        format: str | None = None, key: Key | None = None, help: str | None = None, on_change: WidgetCallback | None = None, args: WidgetArgs | None = None, kwargs: WidgetKwargs | None = None, placeholder: str | None = None, disabled: bool = False, label_visibility: LabelVisibility = "visible"
    ) -> int | IntOrNone:
        ...

    # If "value=int" is given and all other numerical inputs are "int"s
    #   or not provided, return "int"
    @overload
    def number_input(
        self,
        label: str,
        min_value: int | None = None,
        max_value: int | None = None,
        *,
        value: int,
        step: int | None = None,
        format: str | None = None, key: Key | None = None, help: str | None = None, on_change: WidgetCallback | None = None, args: WidgetArgs | None = None, kwargs: WidgetKwargs | None = None, placeholder: str | None = None, disabled: bool = False, label_visibility: LabelVisibility = "visible"
    ) -> int:
        ...

    # If "step=int" is given and all other numerical inputs are "int"s
    #   or not provided (value optionally being "min"), return "int"
    # If "step=int, value=None" is given and all other numerical inputs
    #   are "int"s or not provided, return "int | None"
    @overload
    def number_input(
        self,
        label: str,
        min_value: int | None = None,
        max_value: int | None = None,
        value: IntOrNone | Literal["min"] = "min",
        *,
        step: int,
        format: str | None = None, key: Key | None = None, help: str | None = None, on_change: WidgetCallback | None = None, args: WidgetArgs | None = None, kwargs: WidgetKwargs | None = None, placeholder: str | None = None, disabled: bool = False, label_visibility: LabelVisibility = "visible"
    ) -> int | IntOrNone:
        ...

    # If all numerical inputs are floats (with value optionally being "min")
    #   or are not provided, return "float"
    # If only "value=None" is given and none of the other numerical inputs
    #   are "int"s, return "float | None"
    @overload
    def number_input(
        self,
        label: str,
        min_value: float | None = None,
        max_value: float | None = None,
        value: FloatOrNone | Literal["min"] = "min",
        step: float | None = None,
        format: str | None = None, key: Key | None = None, help: str | None = None, on_change: WidgetCallback | None = None, args: WidgetArgs | None = None, kwargs: WidgetKwargs | None = None, *, placeholder: str | None = None, disabled: bool = False, label_visibility: LabelVisibility = "visible"
    ) -> float | FloatOrNone:
        ...
    # # fmt: on

    @gather_metrics("number_input")
    def number_input(
        self,
        label: str,
        min_value: Number | None = None,
        max_value: Number | None = None,
        value: Number | Literal["min"] | None = "min",
        step: Number | None = None,
        format: str | None = None,
        key: Key | None = None,
        help: str | None = None,
        on_change: WidgetCallback | None = None,
        args: WidgetArgs | None = None,
        kwargs: WidgetKwargs | None = None,
        *,  # keyword-only arguments:
        placeholder: str | None = None,
        disabled: bool = False,
        label_visibility: LabelVisibility = "visible",
    ) -> Number | None:
        r"""Display a numeric input widget.

        .. note::
            Integer values exceeding +/- ``(1<<53) - 1`` cannot be accurately
            stored or returned by the widget due to serialization contstraints
            between the Python server and JavaScript client. You must handle
            such numbers as floats, leading to a loss in precision.

        Parameters
        ----------
        label : str
            A short label explaining to the user what this input is for.
            The label can optionally contain GitHub-flavored Markdown of the
            following types: Bold, Italics, Strikethroughs, Inline Code, Links,
            and Images. Images display like icons, with a max height equal to
            the font height.

            Unsupported Markdown elements are unwrapped so only their children
            (text contents) render. Display unsupported elements as literal
            characters by backslash-escaping them. E.g.,
            ``"1\. Not an ordered list"``.

            See the ``body`` parameter of |st.markdown|_ for additional,
            supported Markdown directives.

            For accessibility reasons, you should never set an empty label, but
            you can hide it with ``label_visibility`` if needed. In the future,
            we may disallow empty labels by raising an exception.

            .. |st.markdown| replace:: ``st.markdown``
            .. _st.markdown: https://docs.streamlit.io/develop/api-reference/text/st.markdown

        min_value : int, float, or None
            The minimum permitted value.
            If None, there will be no minimum.

        max_value : int, float, or None
            The maximum permitted value.
            If None, there will be no maximum.

        value : int, float, "min" or None
            The value of this widget when it first renders. If ``None``, will initialize
            empty and return ``None`` until the user provides input.
            If "min" (default), will initialize with min_value, or 0.0 if
            min_value is None.

        step : int, float, or None
            The stepping interval.
            Defaults to 1 if the value is an int, 0.01 otherwise.
            If the value is not specified, the format parameter will be used.

        format : str or None
            A printf-style format string controlling how the interface should
            display numbers. The output must be purely numeric. This does not
            impact the return value of the widget. Formatting is handled by
            `sprintf.js <https://github.com/alexei/sprintf.js>`_.

            For example, ``format="%0.1f"`` adjusts the displayed decimal
            precision to only show one digit after the decimal.

        key : str or int
            An optional string or integer to use as the unique key for the widget.
            If this is omitted, a key will be generated for the widget
            based on its content. No two widgets may have the same key.

        help : str
            An optional tooltip that gets displayed next to the widget label.
            Streamlit only displays the tooltip when
            ``label_visibility="visible"``.

        on_change : callable
            An optional callback invoked when this number_input's value changes.

        args : tuple
            An optional tuple of args to pass to the callback.

        kwargs : dict
            An optional dict of kwargs to pass to the callback.

        placeholder : str or None
            An optional string displayed when the number input is empty.
            If None, no placeholder is displayed.

        disabled : bool
            An optional boolean that disables the number input if set to
            ``True``. The default is ``False``.

        label_visibility : "visible", "hidden", or "collapsed"
            The visibility of the label. The default is ``"visible"``. If this
            is ``"hidden"``, Streamlit displays an empty spacer instead of the
            label, which can help keep the widget alligned with other widgets.
            If this is ``"collapsed"``, Streamlit displays no label or spacer.

        Returns
        -------
        int or float or None
            The current value of the numeric input widget or ``None`` if the widget
            is empty. The return type will match the data type of the value parameter.

        Example
        -------
        >>> import streamlit as st
        >>>
        >>> number = st.number_input("Insert a number")
        >>> st.write("The current number is ", number)

        .. output::
           https://doc-number-input.streamlit.app/
           height: 260px

        To initialize an empty number input, use ``None`` as the value:

        >>> import streamlit as st
        >>>
        >>> number = st.number_input(
        ...     "Insert a number", value=None, placeholder="Type a number..."
        ... )
        >>> st.write("The current number is ", number)

        .. output::
           https://doc-number-input-empty.streamlit.app/
           height: 260px

        """
        ctx = get_script_run_ctx()
        return self._number_input(
            label=label,
            min_value=min_value,
            max_value=max_value,
            value=value,
            step=step,
            format=format,
            key=key,
            help=help,
            on_change=on_change,
            args=args,
            kwargs=kwargs,
            placeholder=placeholder,
            disabled=disabled,
            label_visibility=label_visibility,
            ctx=ctx,
        )

    def _number_input(
        self,
        label: str,
        min_value: Number | None = None,
        max_value: Number | None = None,
        value: Number | Literal["min"] | None = "min",
        step: Number | None = None,
        format: str | None = None,
        key: Key | None = None,
        help: str | None = None,
        on_change: WidgetCallback | None = None,
        args: WidgetArgs | None = None,
        kwargs: WidgetKwargs | None = None,
        *,  # keyword-only arguments:
        placeholder: str | None = None,
        disabled: bool = False,
        label_visibility: LabelVisibility = "visible",
        ctx: ScriptRunContext | None = None,
    ) -> Number | None:
        key = to_key(key)

        check_widget_policies(
            self.dg,
            key,
            on_change,
            default_value=value if value != "min" else None,
        )
        maybe_raise_label_warnings(label, label_visibility)

        element_id = compute_and_register_element_id(
            "number_input",
            user_key=key,
            form_id=current_form_id(self.dg),
            label=label,
            min_value=min_value,
            max_value=max_value,
            value=value,
            step=step,
            format=format,
            help=help,
            placeholder=None if placeholder is None else str(placeholder),
        )

        # Ensure that all arguments are of the same type.
        number_input_args = [min_value, max_value, value, step]

        all_int_args = all(
            isinstance(a, (numbers.Integral, type(None), str))
            for a in number_input_args
        )

        all_float_args = all(
            isinstance(a, (float, type(None), str)) for a in number_input_args
        )

        if not all_int_args and not all_float_args:
            raise StreamlitMixedNumericTypesError(value=value, min_value=min_value, max_value=max_value, step=step)

        session_state = get_session_state().filtered_state
        if key is not None and key in session_state and session_state[key] is None:
            value = None

        if value == "min":
            if min_value is not None:
                value = min_value
            elif all_int_args and all_float_args:
                value = 0.0  # if no values are provided, defaults to float
            elif all_int_args:
                value = 0
            else:
                value = 0.0

        int_value = isinstance(value, numbers.Integral)
        float_value = isinstance(value, float)

        if value is None:
            if all_int_args and not all_float_args:
                # Select int type if all relevant args are ints:
                int_value = True
            else:
                # Otherwise, defaults to float:
                float_value = True

        if format is None:
            format = "%d" if int_value else "%0.2f"

        # Warn user if they format an int type as a float or vice versa.
        if format in ["%d", "%u", "%i"] and float_value:
            import streamlit as st

            st.warning(
                "Warning: NumberInput value below has type float,"
                f" but format {format} displays as integer."
            )
        elif format[-1] == "f" and int_value:
            import streamlit as st

            st.warning(
                "Warning: NumberInput value below has type int so is"
                f" displayed as int despite format string {format}."
            )

        if step is None:
            step = 1 if int_value else 0.01

        try:
            float(format % 2)
        except (TypeError, ValueError):
            raise StreamlitInvalidNumberFormatError(format)


        # Ensure that the value matches arguments' types.
        all_ints = int_value and all_int_args

        if min_value is not None and value is not None and min_value > value:
            raise StreamlitValueBelowMinError(value=value, min_value=min_value)


        if max_value is not None and value is not None and max_value < value:
            raise StreamlitValueAboveMaxError(value=value, max_value=max_value)

        # Bounds checks. JSNumber produces human-readable exceptions that
        # we simply re-package as StreamlitAPIExceptions.
        try:
            if all_ints:
                if min_value is not None:
                    JSNumber.validate_int_bounds(int(min_value), "`min_value`")
                if max_value is not None:
                    JSNumber.validate_int_bounds(int(max_value), "`max_value`")
                if step is not None:
                    JSNumber.validate_int_bounds(int(step), "`step`")
                if value is not None:
                    JSNumber.validate_int_bounds(int(value), "`value`")
            else:
                if min_value is not None:
                    JSNumber.validate_float_bounds(min_value, "`min_value`")
                if max_value is not None:
                    JSNumber.validate_float_bounds(max_value, "`max_value`")
                if step is not None:
                    JSNumber.validate_float_bounds(step, "`step`")
                if value is not None:
                    JSNumber.validate_float_bounds(value, "`value`")
        except JSNumberBoundsException as e:
            raise StreamlitJSNumberBoundsError(str(e))

        data_type = NumberInputProto.INT if all_ints else NumberInputProto.FLOAT

        number_input_proto = NumberInputProto()
        number_input_proto.id = element_id
        number_input_proto.data_type = data_type
        number_input_proto.label = label
        if value is not None:
            number_input_proto.default = value
        if placeholder is not None:
            number_input_proto.placeholder = str(placeholder)
        number_input_proto.form_id = current_form_id(self.dg)
        number_input_proto.disabled = disabled
        number_input_proto.label_visibility.value = get_label_visibility_proto_value(
            label_visibility
        )

        if help is not None:
            number_input_proto.help = dedent(help)

        if min_value is not None:
            number_input_proto.min = min_value
            number_input_proto.has_min = True

        if max_value is not None:
            number_input_proto.max = max_value
            number_input_proto.has_max = True

        if step is not None:
            number_input_proto.step = step

        if format is not None:
            number_input_proto.format = format

        serde = NumberInputSerde(value, data_type)
        widget_state = register_widget(
            number_input_proto.id,
            on_change_handler=on_change,
            args=args,
            kwargs=kwargs,
            deserializer=serde.deserialize,
            serializer=serde.serialize,
            ctx=ctx,
            value_type="double_value"
        )

        if widget_state.value_changed:
            if widget_state.value is not None:
                number_input_proto.value = widget_state.value
            number_input_proto.set_value = True

        self.dg._enqueue("number_input", number_input_proto)
        return widget_state.value

    @property
    def dg(self) -> DeltaGenerator:
        """Get our DeltaGenerator."""
        return cast("DeltaGenerator", self)
