from functools import lru_cache

from app.core.handles import parse_handles
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", extra="ignore")

    bot_token: str
    database_url: str = "sqlite+aiosqlite:///./dev.db"
    gate_channel: str = "@DBUCentral"
    gate_channels: str = ""  # optional override: "@DBUCentral,@DBUcentralforum"
    hide_empty_courses: bool = True  # students only see courses that already have files
    admin_ids: str = ""  # comma separated Telegram user ids
    default_lang: str = "en"
    library_channel_id: int = 0  # private backup channel (0 = no backup copy)
    log_level: str = "INFO"

    # --- watermark stamped on every PDF the admin uploads ---
    watermark_enabled: bool = True
    watermark_text: str = "DBU Freshman Central"
    watermark_url: str = ""  # empty = https://t.me/<GATE_CHANNEL>
    watermark_diagonal: bool = True  # faint diagonal brand text in the middle of each page

    @property
    def gate_list(self) -> list[str]:
        """EVERY listed channel/group must be joined. Default: the channel + the discussion forum."""
        return parse_handles(self.gate_channels) or parse_handles(f"{self.gate_channel},@DBUcentralforum")

    @property
    def watermark_link(self) -> str:
        return self.watermark_url or f"https://t.me/{self.gate_channel.lstrip('@')}"

    # --- student file contributions ---
    contributions_enabled: bool = True
    contribution_xp: int = 20
    contribution_bonus_xp: int = 5  # extra when the course is short of material
    contribution_weekly_cap: int = 5  # rewarded files per student per week
    contribution_min_days: int = 2  # active days before a student may submit
    contribution_pending_limit: int = 5
    contribution_daily_limit: int = 8

    # --- weekly season / prizes (money is OFF until you switch it on) ---
    prizes_enabled: bool = True
    prize_top: str = "50,30,20"  # birr airtime card for rank 1,2,3 (comma separated)
    prize_raffle: int = 10  # birr, one weighted draw among other eligible players
    min_week_xp: int = 40
    min_active_days: int = 4

    @property
    def prize_list(self) -> list[int]:
        return [int(x) for x in self.prize_top.replace(" ", "").split(",") if x.isdigit()]

    @property
    def admin_id_set(self) -> set[int]:
        return {int(x) for x in self.admin_ids.replace(" ", "").split(",") if x.isdigit()}


@lru_cache
def get_settings() -> Settings:
    return Settings()