from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path

from dotenv import load_dotenv

DEFAULT_COLLECTIONS = {
    "Core": "3521297585",
    "Content": "3521319712",
    "Cosmetics": "3637541646",
}


def _as_bool(value: str | None, default: bool) -> bool:
    if value is None:
        return default
    return value.strip().lower() in {"1", "true", "yes", "on"}


def _collection_id(value: str | None, fallback: str) -> str:
    """Accept either a raw Workshop id or one of the existing URL settings."""
    if not value:
        return fallback
    digits = "".join(character for character in value if character.isdigit())
    return digits or fallback


@dataclass(frozen=True)
class Settings:
    host: str
    port: int
    database_path: Path
    steamcmd_path: str
    workshop_content_dir: Path
    steamcmd_batch_size: int
    steamcmd_timeout_seconds: int
    refresh_interval_seconds: int
    refresh_on_startup: bool
    game_version: str
    admin_token: str | None
    collections: dict[str, str]
    static_dir: Path

    @classmethod
    def load(cls, root: Path | None = None) -> Settings:
        root = (root or Path.cwd()).resolve()
        load_dotenv(root / ".env")
        default_steamcmd = ".steamcmd/steamcmd.exe" if os.name == "nt" else "steamcmd"

        return cls(
            host=os.getenv("PROGRESSION_HOST", "127.0.0.1"),
            port=int(os.getenv("PROGRESSION_PORT", "8000")),
            database_path=(
                root / os.getenv("PROGRESSION_DB_PATH", ".data/progression.db")
            ).resolve(),
            steamcmd_path=os.getenv("STEAMCMD_PATH", default_steamcmd),
            workshop_content_dir=(
                root
                / os.getenv(
                    "STEAMCMD_WORKSHOP_DIR",
                    ".steamcmd/steamapps/workshop/content/294100",
                )
            ).resolve(),
            steamcmd_batch_size=max(1, int(os.getenv("STEAMCMD_BATCH_SIZE", "25"))),
            steamcmd_timeout_seconds=max(
                60, int(os.getenv("STEAMCMD_TIMEOUT_SECONDS", "1800"))
            ),
            refresh_interval_seconds=max(
                60, int(os.getenv("REFRESH_INTERVAL_SECONDS", "3600"))
            ),
            refresh_on_startup=_as_bool(os.getenv("REFRESH_ON_STARTUP"), True),
            game_version=os.getenv("MODLIST_GAME_VERSION", "1.6").strip() or "1.6",
            admin_token=os.getenv("PROGRESSION_ADMIN_TOKEN") or None,
            collections={
                "Core": _collection_id(
                    os.getenv("CORE_COLLECTION_URL"), DEFAULT_COLLECTIONS["Core"]
                ),
                "Content": _collection_id(
                    os.getenv("CONTENT_COLLECTION_URL"), DEFAULT_COLLECTIONS["Content"]
                ),
                "Cosmetics": _collection_id(
                    os.getenv("COSMETICS_COLLECTION_URL"),
                    DEFAULT_COLLECTIONS["Cosmetics"],
                ),
            },
            static_dir=root / "progression_backend" / "static",
        )