"""Insta-AutoApp Configuration — single source of truth for all constants."""

import os
from dotenv import load_dotenv

load_dotenv()

# ── LLM Provider ─────────────────────────────────────────────────────
LLM_PROVIDER = os.getenv("LLM_PROVIDER", "huggingface")  # "huggingface" or "anthropic"
LLM_MODEL = os.getenv("LLM_MODEL", "Qwen/Qwen2.5-7B-Instruct")
HF_TOKEN = os.getenv("HF_TOKEN", "")
ANTHROPIC_API_KEY = os.getenv("ANTHROPIC_API_KEY", "")

MAX_RETRIES = 3
RETRY_DELAY = 2.5
REQUEST_TIMEOUT = 30

# ── FAISS / Retrieval ────────────────────────────────────────────────
def _find_data_file(filename: str) -> str:
    """Locate a data file. Checks root first (HF Spaces flat upload),
    then data/ subfolder (local dev). Falls back to root if neither exists yet."""
    if os.path.exists(filename):
        return filename
    sub = os.path.join("data", filename)
    if os.path.exists(sub):
        return sub
    # Neither exists yet — prefer data/ if dir exists, else root
    return sub if os.path.isdir("data") else filename

FAISS_INDEX_PATH = _find_data_file("index.faiss")
FAISS_DOCSTORE_PATH = _find_data_file("index.pkl")
EMBEDDING_MODEL = "sentence-transformers/all-MiniLM-L6-v2"
TOP_K = 5
CHUNK_SIZE = 500
CHUNK_OVERLAP = 50

# ── Vehicle Profile ──────────────────────────────────────────────────
TRIM_OPTIONS = ["Base", "Big Bend", "Black Diamond", "Badlands", "Outer Banks", "Wildtrak", "Raptor"]
ENGINE_OPTIONS = ["2.3L EcoBoost", "2.7L EcoBoost"]
PACKAGE_OPTIONS = ["None", "Sasquatch", "Lux", "Sasquatch + Lux"]
TOP_TYPE_OPTIONS = ["Soft Top", "Hard Top", "Modular Top"]
MILEAGE_MIN = 0
MILEAGE_MAX = 300_000
MILEAGE_DEFAULT = 0

# ── Urgency & Safety ─────────────────────────────────────────────────
URGENCY_LEVELS = ["Safe", "Monitor", "Urgent", "Do Not Drive"]
SAFETY_CRITICAL_KEYWORDS = [
    "brake", "braking", "stopping", "steering", "steer",
    "overheat", "overheating", "temperature", "drivetrain", "transmission",
    "4x4", "4wd", "burning", "smoke", "fire",
    "airbag", "abs", "coolant", "oil pressure",
]

FALLBACK_FOLLOWUP_QUESTIONS = [
    "What driving mode were you in when this occurred? (2H, 4H, 4L, or a GOAT mode)",
    "Approximately how long has this symptom been occurring?",
]

# ── UI Text ──────────────────────────────────────────────────────────
APP_TITLE = "Insta-AutoApp"
APP_SUBTITLE = "OEM-grounded symptom triage for 2023 Ford Bronco owners."
DISCLAIMER_BANNER = (
    "Insta-AutoApp provides triage guidance only, not professional mechanical diagnosis. "
    "Always consult a Ford-certified mechanic for safety-critical issues."
)
DISCLAIMER_RESPONSE = (
    "This is triage guidance only, not a professional mechanical diagnosis. "
    "For safety-critical issues, consult a Ford-certified mechanic."
)
ERROR_API_UNAVAILABLE = (
    "The AI triage service is temporarily unavailable. "
    "Please try again in a few minutes."
)
ERROR_NOT_IN_MANUAL = (
    "This issue is not clearly covered in the OEM manual. "
    "For your safety, we recommend contacting a Ford dealer or certified mechanic for inspection."
)

# ── Data Source ───────────────────────────────────────────────────────
MANUAL_PDF_FILENAME = "2023_Ford_Bronco_Owners_Manual_version_1_om_EN-US.pdf"
MANUAL_PDF_PATH = _find_data_file(MANUAL_PDF_FILENAME)