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


class User(Record):
    @classmethod
    def fields(cls):
        return [*super().fields(), Field("name"), Field("email", unique=True)]


class Group(Record):
    @classmethod
    def fields(cls):
        return [*super().fields(), Field("name", unique=True), Collection("users", User)]


class Page(Record):
    @classmethod
    def fields(cls):
        return [
            *super().fields(),
            Field("stub", unique=True),
            Field("title"),
            Field("body"),
            Pointer("parent", value_type=Page),
            Collection("pages", Page),
        ]

    def before_insert(self):
        if not self.stub and not self.title:
            raise Exception("Must provide either a stub or a title!")
        if not self.stub:
            self.stub = self.title.title().replace(" ", "")
        if not self.title:
            self.title = self.stub.title()