from dataclasses import dataclass, field
from functools import cached_property

from grung.types import BackReference, Collection, Pointer, Record

from ttfrog import schema

READ_ONLY_FIELD_TYPES = [Collection, Pointer, BackReference]


@dataclass
class Form:
    """
    The base Form controller for the web UI.
    """
    record: Record
    data: field(default_factory=dict)

    @cached_property
    def read_only(self) -> set:
        return [
            name for (name, attr) in self.record._metadata.fields.items() if type(attr) in READ_ONLY_FIELD_TYPES
        ] + ["uid"]

    def prepare(self):
        for key, value in self.data.items():

            # filter out fields that cannot be set by the user
            if key in self.read_only:
                continue

            self.record[key] = value
        return self.record


@dataclass
class Page(Form):
    """
    A form for creating and updating Page records.
    """
    record: schema.Page

    @cached_property
    def read_only(self) -> set:
        return set(list(super().read_only) + ["stub"])


@dataclass
class NPC(Page):
    """
    A form for creating and updating Page records.
    """
    record: schema.NPC


@dataclass
class User(Page):
    """
    A form for creating and updating Page records.
    """
    record: schema.NPC


@dataclass
class Group(Page):
    """
    A form for creating and updating Page records.
    """
    record: schema.NPC