"""Typed application settings — the only reader of environment variables."""

from enum import StrEnum

from pydantic_settings import BaseSettings, SettingsConfigDict


class AppMode(StrEnum):
    """Runtime mode: live Spotify + Anthropic, or fixture-replay demo."""

    LIVE = "live"
    DEMO = "demo"


class Settings(BaseSettings):
    """All pipeline tunables in one place so the eval harness can sweep them."""

    model_config = SettingsConfigDict(env_file=".env", extra="ignore")

    app_mode: AppMode = AppMode.DEMO
    host_port: int = 8000

    # credentials (empty in demo mode; incomplete live config fails fast)
    spotify_client_id: str = ""
    spotify_client_secret: str = ""
    spotify_redirect_uri: str = "http://127.0.0.1:8000/callback"
    anthropic_api_key: str = ""
    # hosted instance only: installs a session at startup (never set locally)
    spotify_refresh_token: str = ""

    # LLM
    llm_model: str = "claude-sonnet-5"
    llm_effort_intent: str = "low"
    llm_effort_rerank: str = "medium"
    llm_max_tokens: int = 4096

    # pipeline shape
    candidate_count: int = 30
    recommendation_count: int = 15
    rerank_buffer: int = 5

    # grounding
    grounding_fanout_width: int = 8
    grounding_floor: int = 10
    title_similarity_threshold: float = 0.82
    request_deadline_seconds: float = 20.0

    # caches
    resolution_cache_ttl_seconds: int = 3600
    taste_profile_ttl_seconds: int = 1800


settings = Settings()