"""Radix form component."""

from __future__ import annotations

from hashlib import md5
from typing import Any, Dict, Iterator, Literal

from jinja2 import Environment

from reflex.components.component import Component
from reflex.components.tags.tag import Tag
from reflex.constants.base import Dirs
from reflex.constants.event import EventTriggers
from reflex.event import EventChain
from reflex.utils import imports
from reflex.utils.format import format_event_chain, to_camel_case
from reflex.vars import BaseVar, Var

from .base import RadixPrimitiveComponentWithClassName

FORM_DATA = Var.create("form_data")
HANDLE_SUBMIT_JS_JINJA2 = Environment().from_string(
    """
    const handleSubmit_{{ handle_submit_unique_name }} = useCallback((ev) => {
        const $form = ev.target
        ev.preventDefault()
        const {{ form_data }} = {...Object.fromEntries(new FormData($form).entries()), ...{{ field_ref_mapping }}}

        {{ on_submit_event_chain }}

        if ({{ reset_on_submit }}) {
            $form.reset()
        }
    })
    """
)


class FormComponent(RadixPrimitiveComponentWithClassName):
    """Base class for all @radix-ui/react-form components."""

    library = "@radix-ui/react-form@^0.0.3"


class FormRoot(FormComponent):
    """The root component of a radix form."""

    tag = "Root"

    alias = "RadixFormRoot"

    # If true, the form will be cleared after submit.
    reset_on_submit: Var[bool] = False  # type: ignore

    # The name used to make this form's submit handler function unique
    handle_submit_unique_name: Var[str]

    def get_event_triggers(self) -> Dict[str, Any]:
        """Event triggers for radix form root.

        Returns:
            The triggers for event supported by Root.
        """
        return {
            **super().get_event_triggers(),
            EventTriggers.ON_SUBMIT: lambda e0: [FORM_DATA],
            "on_clear_server_errors": lambda: [],
        }

    @classmethod
    def create(cls, *children, **props):
        """Create a form component.

        Args:
            *children: The children of the form.
            **props: The properties of the form.

        Returns:
            The form component.
        """
        if "handle_submit_unique_name" in props:
            return super().create(*children, **props)

        # Render the form hooks and use the hash of the resulting code to create a unique name.
        props["handle_submit_unique_name"] = ""
        form = super().create(*children, **props)
        form.handle_submit_unique_name = md5(
            str(form.get_hooks()).encode("utf-8")
        ).hexdigest()
        return form

    def _get_imports(self) -> imports.ImportDict:
        return imports.merge_imports(
            super()._get_imports(),
            {
                "react": {imports.ImportVar(tag="useCallback")},
                f"/{Dirs.STATE_PATH}": {
                    imports.ImportVar(tag="getRefValue"),
                    imports.ImportVar(tag="getRefValues"),
                },
            },
        )

    def _get_hooks(self) -> str | None:
        if EventTriggers.ON_SUBMIT not in self.event_triggers:
            return
        return HANDLE_SUBMIT_JS_JINJA2.render(
            handle_submit_unique_name=self.handle_submit_unique_name,
            form_data=FORM_DATA,
            field_ref_mapping=str(Var.create_safe(self._get_form_refs())),
            on_submit_event_chain=format_event_chain(
                self.event_triggers[EventTriggers.ON_SUBMIT]
            ),
            reset_on_submit=self.reset_on_submit,
        )

    def _render(self) -> Tag:
        render_tag = (
            super()
            ._render()
            .remove_props(
                "reset_on_submit",
                "handle_submit_unique_name",
                to_camel_case(EventTriggers.ON_SUBMIT),
            )
        )
        if EventTriggers.ON_SUBMIT in self.event_triggers:
            render_tag.add_props(
                **{
                    EventTriggers.ON_SUBMIT: BaseVar(
                        _var_name=f"handleSubmit_{self.handle_submit_unique_name}",
                        _var_type=EventChain,
                    )
                }
            )
        return render_tag

    def _get_form_refs(self) -> Dict[str, Any]:
        # Send all the input refs to the handler.
        form_refs = {}
        for ref in self.get_refs():
            # when ref start with refs_ it's an array of refs, so we need different method
            # to collect data
            if ref.startswith("refs_"):
                ref_var = Var.create_safe(ref[:-3]).as_ref()
                form_refs[ref[5:-3]] = Var.create_safe(
                    f"getRefValues({str(ref_var)})", _var_is_local=False
                )._replace(merge_var_data=ref_var._var_data)
            else:
                ref_var = Var.create_safe(ref).as_ref()
                form_refs[ref[4:]] = Var.create_safe(
                    f"getRefValue({str(ref_var)})", _var_is_local=False
                )._replace(merge_var_data=ref_var._var_data)
        return form_refs

    def _apply_theme(self, theme: Component | None):
        return {
            "width": "260px",
            **self.style,
        }

    def _get_vars(self) -> Iterator[Var]:
        yield from super()._get_vars()
        yield from self._get_form_refs().values()


class FormField(FormComponent):
    """A form field component."""

    tag = "Field"

    alias = "RadixFormField"

    name: Var[str]

    server_invalid: Var[bool]

    def _apply_theme(self, theme: Component | None):
        return {
            "display": "grid",
            "margin_bottom": "10px",
            **self.style,
        }


class FormLabel(FormComponent):
    """A form label component."""

    tag = "Label"

    alias = "RadixFormLabel"

    def _apply_theme(self, theme: Component | None):
        return {
            "font_size": "15px",
            "font_weight": "500",
            "line_height": "35px",
            **self.style,
        }


class FormControl(FormComponent):
    """A form control component."""

    tag = "Control"

    alias = "RadixFormControl"


LiteralMatcher = Literal[
    "badInput",
    "patternMismatch",
    "rangeOverflow",
    "rangeUnderflow",
    "stepMismatch",
    "tooLong",
    "tooShort",
    "typeMismatch",
    "valid",
    "valueMissing",
]


class FormMessage(FormComponent):
    """A form message component."""

    tag = "Message"

    alias = "RadixFormMessage"

    # Used to target a specific field by name when rendering outside of a Field part.
    name: Var[str]

    # Used to indicate on which condition the message should be visible.
    match: Var[LiteralMatcher]

    # Forces the message to be shown. This is useful when using server-side validation.
    forceMatch: Var[bool]

    def _apply_theme(self, theme: Component | None):
        return {
            "font_size": "13px",
            "opacity": "0.8",
            "color": "white",
            **self.style,
        }


class FormValidityState(FormComponent):
    """A form validity state component."""

    tag = "ValidityState"
    alias = "RadixFormValidityState"


class FormSubmit(FormComponent):
    """A form submit component."""

    tag = "Submit"
    alias = "RadixFormSubmit"


form_root = FormRoot.create
form_field = FormField.create
form_label = FormLabel.create
form_control = FormControl.create
form_message = FormMessage.create
form_validity_state = FormValidityState.create
form_submit = FormSubmit.create