"""Central configuration: loads .env files and exposes API keys + constants."""

import os
from pathlib import Path

from dotenv import load_dotenv

PROJECT_ROOT = Path(__file__).resolve().parent.parent

# Keys may live in the root .env or the older code/.env — load both.
load_dotenv(PROJECT_ROOT / ".env")
load_dotenv(PROJECT_ROOT / "code" / ".env")


def _get_key(*names):
    for name in names:
        value = os.getenv(name)
        if value:
            value = value.strip().strip('"').strip("'")
            # .env.example placeholders like "your_gemini_key..." are not keys
            if value and not value.lower().startswith("your_"):
                return value
    return None


def tomtom_key():
    return _get_key("TomTom_api_key", "TOMTOM_API_KEY", "tomtom_api_key", "tomtom_api")


def calendarific_key():
    return _get_key("calendarific_api_key", "CALENDARIFIC_API_KEY")


def geoapify_key():
    return _get_key("Geoapify_API", "GEOAPIFY_API", "GEOAPIFY_API_KEY")


def ticketmaster_key():
    return _get_key("Ticketmaster_API", "TICKETMASTER_API", "TICKETMASTER_API_KEY")


def gemini_key():
    return _get_key("GEMINI_API_KEY", "GOOGLE_API_KEY", "gemini_api_key")


def groq_key():
    return _get_key("GROQ_API_KEY", "groq_api_key")


def mongodb_uri():
    return _get_key("MONGODB_URI", "MONGO_URI")


# City scope: Lucknow only (MVP)
CITY_NAME = "Lucknow"
CITY_STATE = "Uttar Pradesh"
CITY_CENTER = {"lat": 26.8467, "lon": 80.9462}
TIMEZONE = "Asia/Kolkata"

# Fallback chains: each provider tries its strong model first, then a
# lighter one (different rate-limit buckets), then moves to the next provider.
GEMINI_MODELS = ["gemini-2.5-flash", "gemini-2.5-flash-lite"]
GROQ_MODELS = ["llama-3.3-70b-versatile", "llama-3.1-8b-instant"]

# Departure sweep settings
SWEEP_WINDOW_MIN = 90
SWEEP_STEP_MIN = 15