from pydantic import BaseModel, model_validator, Field, HttpUrl
from enum import StrEnum
from typing import Annotated, Self
from fiber_package.util import GroupRef
from datetime import datetime


# may be moved to another file if used elsewhere
'''
The category is only used to place the communication correctly in the weekly
mailing and the board-website, it is not visible (or relevant) to readers
'''
class CommunicationCategory(StrEnum):
    announcement = "announcement"
    news = "news"
    activity = "activity"


'''
A "communication" is a piece of communication/promotion to be shared with
members, which may appear on the website and in the weekly mailing.
'''
class CommunicationModel(BaseModel):
    category: CommunicationCategory

    name_en: str
    name_nl: str

    subtitle_en: str
    subtitle_nl: str
    # subtitles currently (2026) appear only in the table of contents in the
    # weekly mailing; they are meant to be a short catchy flavour text

    description_en: str
    description_nl: str

    image: HttpUrl | None
    # often, a poster comes associated with a communication (in particular if
    # it's an activity). In that case, the poster is uploaded to the cloud and
    # the share link is attached to the communication
    # TODO: potentially rethink the way images are attached to communications

    visibility: bool
    # should this communication be shown to members at all? Useful for
    # temporarily hiding a communication
    
    only_members: bool
    # is this communication only visible to members? This refers to visibility
    # on the website, i.e. is this only visible to visitors who are logged in?
    
    archived: bool
    # an archived communication cannot be edited, only viewed for future
    # reference



class ActivityModel(CommunicationModel):
    category: Annotated[
        CommunicationCategory,
        Field(pattern=CommunicationCategory.activity)
    ]

    signuplist: GroupRef = GroupRef("signuplist", None)
    # TODO: validate that a signuplist can only be attached if category is
    # activity? Or should this not be validated?

    start_time: datetime
    end_time: datetime

    @model_validator(mode='after')
    def check_end_after_start(self) -> Self:
        if self.end_time < self.start_time:
            raise ValueError("End time cannot be earlier than start time")
        return self