"""A pin input component."""

from typing import Dict, Optional

from reflex.components.component import Component
from reflex.components.layout import Foreach
from reflex.components.libs.chakra import ChakraComponent
from reflex.event import EVENT_ARG
from reflex.utils import format
from reflex.vars import Var


class PinInput(ChakraComponent):
    """The component that provides context to all the pin-input fields."""

    tag = "PinInput"

    # State var to bind the the input.
    value: Var[str]

    # If true, the pin input receives focus on mount
    auto_focus: Var[bool]

    # The default value of the pin input
    default_value: Var[str]

    # The border color when the input is invalid.
    error_border_color: Var[str]

    # The border color when the input is focused.
    focus_border_color: Var[str]

    # The top-level id string that will be applied to the input fields. The index of the input will be appended to this top-level id.
    id_: Var[str]

    # The length of the number input.
    length: Var[int]

    # If true, the pin input component is put in the disabled state
    is_disabled: Var[bool]

    # If true, the pin input component is put in the invalid state
    is_invalid: Var[bool]

    # If true, focus will move automatically to the next input once filled
    manage_focus: Var[bool]

    # If true, the input's value will be masked just like `type=password`
    mask: Var[bool]

    # The placeholder for the pin input
    placeholder: Var[str]

    # The type of values the pin-input should allow ("number" | "alphanumeric").
    type_: Var[str]

    # "outline" | "flushed" | "filled" | "unstyled"
    variant: Var[str]

    def get_controlled_triggers(self) -> Dict[str, Var]:
        """Get the event triggers that pass the component's value to the handler.

        Returns:
            A dict mapping the event trigger to the var that is passed to the handler.
        """
        return {
            "on_change": EVENT_ARG,
            "on_complete": EVENT_ARG,
        }

    def get_ref(self):
        """Return a reference because we actually attached the ref to the PinInputFields.

        Returns:
            None.
        """
        return None

    def _get_ref_hook(self) -> Optional[str]:
        """Override the base _get_ref_hook to handle array refs.

        Returns:
            The overrided hooks.
        """
        if self.id:
            ref = format.format_array_ref(self.id, None)
            if ref:
                return f"const {ref} = Array.from({{length:{self.length}}}, () => useRef(null));"
            return super()._get_ref_hook()

    @classmethod
    def create(cls, *children, **props) -> Component:
        """Create a pin input component.

        If no children are passed in, the component will create a default pin input
        based on the length prop.

        Args:
            *children: The children of the component.
            **props: The props of the component.

        Returns:
            The pin input component.
        """
        if not children and "length" in props:
            _id = props.get("id", None)
            length = props["length"]
            if _id:
                children = [
                    Foreach.create(
                        list(range(length)),  # type: ignore
                        lambda ref, i: PinInputField.create(
                            key=i,
                            id=_id,
                            index=i,
                        ),
                    )
                ]
            else:
                children = [PinInputField()] * length
        return super().create(*children, **props)


class PinInputField(ChakraComponent):
    """The text field that user types in - must be a direct child of PinInput."""

    tag = "PinInputField"

    # the position of the PinInputField inside the PinInput.
    # Default to None because it is assigned by PinInput when created.
    index: Optional[Var[int]] = None

    def _get_ref_hook(self) -> Optional[str]:
        return None

    def get_ref(self):
        """Get the array ref for the pin input.

        Returns:
            The array ref.
        """
        if self.id:
            return format.format_array_ref(self.id, self.index)