"""Configuration for the scheduler container.

All settings flow from env vars (prefix ``SCHED_``) so deployment can tune
intervals + feed lists without rebuilds. Reasonable defaults for a typical
DIDI deployment are baked in, but ``brain_api_url`` is required to fail-fast
if misconfigured.
"""

from __future__ import annotations

from functools import lru_cache
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class SchedulerSettings(BaseSettings):
    """Top-level scheduler config — validated at startup."""

    model_config = SettingsConfigDict(
        env_file=Path(__file__).parent.parent / ".env",
        env_file_encoding="utf-8",
        extra="ignore",
        env_prefix="SCHED_",
    )

    # ---- Brain API target -------------------------------------------------
    brain_api_url: str = Field(
        default="http://brain-api:8090",
        description="Base URL of the brain HTTP API. Docker DNS by default.",
    )
    brain_api_timeout_s: float = Field(default=120.0)

    # ---- Feeder (Pilon 4) -------------------------------------------------
    feeder_enabled: bool = Field(default=True)
    # Intervals (seconds) per volatility — controls how often we poll RSS
    # feeds in each tier.
    feeder_volatile_interval_s: int = Field(default=900)     # 15 min
    feeder_evolving_interval_s: int = Field(default=21600)   # 6 h
    feeder_stable_interval_s: int = Field(default=86400)     # 24 h
    feeder_max_items_per_run: int = Field(default=20)
    feeder_min_published_age_s: int = Field(default=3600)    # skip <1h items
    feeder_max_published_age_s: int = Field(default=259200)  # skip >3d items

    # ---- Auditor (Pilon 5) ------------------------------------------------
    auditor_enabled: bool = Field(default=True)
    auditor_interval_s: int = Field(default=86400)           # 24h sweep
    auditor_batch_limit: int = Field(default=200)
    auditor_min_age_hours: float = Field(
        default=24.0,
        description=(
            "Don't audit atoms younger than this — they were just written, "
            "judging them yields no new signal."
        ),
    )

    # ---- Breaking-news watcher (Pilon 9) ----------------------------------
    watcher_enabled: bool = Field(default=True)
    watcher_poll_interval_s: int = Field(default=300)        # 5 min
    watcher_max_items_per_run: int = Field(default=10)
    watcher_min_published_age_s: int = Field(default=60)     # >1min old
    watcher_max_published_age_s: int = Field(default=3600)   # <1h old

    # ---- Logging ----------------------------------------------------------
    log_level: str = Field(default="INFO")
    log_json: bool = Field(default=False)


@lru_cache(maxsize=1)
def get_settings() -> SchedulerSettings:
    return SchedulerSettings()


settings = get_settings()


# ----------------------------------------------------------------------------
# Default feed lists per volatility — overridable via env (FEED_VOLATILE_URLS,
# FEED_EVOLVING_URLS, FEED_STABLE_URLS, FEED_BREAKING_URLS as
# comma-separated strings) for ops flexibility.
# ----------------------------------------------------------------------------

# Volatile: fast-moving news (war, breaking events, daily politics).
# Note: Reuters retired their public RSS feeds. Operators with paid Reuters
# access can add their feed URLs via the FEED_VOLATILE_URLS env override.
DEFAULT_VOLATILE_FEEDS: list[str] = [
    "https://feeds.bbci.co.uk/news/world/rss.xml",
    "https://www.aljazeera.com/xml/rss/all.xml",
    "https://feeds.npr.org/1004/rss.xml",
    "https://www.theguardian.com/world/rss",
    # Romanian
    "https://www.digi24.ro/rss",
    "https://www.hotnews.ro/rss",
    "https://www.g4media.ro/feed",
]

# Evolving: weekly-stable topics (economy, climate, science debates).
DEFAULT_EVOLVING_FEEDS: list[str] = [
    "https://feeds.bbci.co.uk/news/business/rss.xml",
    "https://feeds.bbci.co.uk/news/health/rss.xml",
    "https://rss.nytimes.com/services/xml/rss/nyt/Science.xml",
]

# Stable: long-cycle topics (basic science, history, settled facts).
DEFAULT_STABLE_FEEDS: list[str] = [
    "https://feeds.bbci.co.uk/news/science_and_environment/rss.xml",
]

# Breaking: small set polled fast (5 min) — only the highest-credibility
# real-time wires. Each item runs through the LLM classifier to decide
# which topics/entities to invalidate caches for.
DEFAULT_BREAKING_FEEDS: list[str] = [
    "https://www.theguardian.com/world/rss",
    "https://feeds.bbci.co.uk/news/world/rss.xml",
    "https://www.aljazeera.com/xml/rss/all.xml",
]


def parse_csv(value: str | None, default: list[str]) -> list[str]:
    """Parse a comma-separated env var into a list, falling back to default."""
    if not value:
        return list(default)
    return [v.strip() for v in value.split(",") if v.strip()]