"""Configuration loader: reads environment variables and accounts YAML."""

from __future__ import annotations

import os
from dataclasses import dataclass, field
from pathlib import Path

import yaml


@dataclass
class CollectorConfig:
    database_url: str
    bsky_api_base: str
    accounts_file: str
    log_level: str = "INFO"
    max_pages_per_account: int = 50
    mention_lookback_hours: int = 12
    feed_page_limit: int = 100  # Bluesky API max per page
    bsky_handle: str | None = None       # for authenticated search
    bsky_app_password: str | None = None  # for authenticated search

    @classmethod
    def from_env(cls) -> CollectorConfig:
        return cls(
            database_url=os.environ["DATABASE_URL"],
            bsky_api_base=os.getenv("BSKY_PUBLIC_API", "https://public.api.bsky.app"),
            accounts_file=os.getenv("ACCOUNTS_FILE", "/app/config/accounts.yml"),
            log_level=os.getenv("LOG_LEVEL", "INFO"),
            max_pages_per_account=int(os.getenv("MAX_PAGES_PER_ACCOUNT", "50")),
            mention_lookback_hours=int(os.getenv("MENTION_LOOKBACK_HOURS", "12")),
            bsky_handle=os.getenv("BSKY_HANDLE"),
            bsky_app_password=os.getenv("BSKY_APP_PASSWORD"),
        )


def load_accounts(path: str) -> list[str]:
    """Load the list of Bluesky handles from a YAML file.

    Returns a list of handle strings (e.g. ['alice.bsky.social', 'bob.bsky.social']).
    """
    data = yaml.safe_load(Path(path).read_text())
    if not data or "accounts" not in data:
        return []
    return [entry["handle"] for entry in data["accounts"] if "handle" in entry]