import os
import time
import requests
from itertools import cycle

# Try to load .env (local dev only, ignored in production)
try:
    from dotenv import load_dotenv
    load_dotenv()
except ImportError:
    pass

# Streamlit-safe logging
def log_message(msg, level="info"):
    try:
        import streamlit as st
        if level == "error":
            st.error(msg)
        elif level == "warning":
            st.warning(msg)
        else:
            st.info(msg)
    except ImportError:
        print(f"[{level.upper()}] {msg}")

APP_TITLE = "PlanMate"
APP_TAGLINE = "AI Powered smart trip planner"

THEME = {
    "bg": "#fcfcfc",
    "text": "#383838",
    "label": "#153d15",
    "border": "#153d15",
}

CURRENCY = "PKR"
UNITS = "metric"
LANGUAGE = "en"

# API Base URLs
AMADEUS_BASE = "https://test.api.amadeus.com"
OPENWEATHER_BASE = "https://api.openweathermap.org"
OPENTRIPMAP_BASE = "https://api.opentripmap.com/0.1/en"

# ---------- Hugging Face Secrets Configuration ----------
def get_secret(key, default=None):
    """
    Get secret from environment first (production),
    fallback to .env for local dev.
    """
    value = os.getenv(key)

    if value is None and default is not None:
        return default
    elif value is None:
        log_message(f"Missing required secret: {key}", level="error")
        raise RuntimeError(f"Missing required secret: {key}")

    return value

def get_env(key: str) -> str:
    val = os.getenv(key)
    if not val:
        raise RuntimeError(f"Missing required environment variable: {key}")
    return val

# ---------- Gemini Key Rotation ----------
gemini_keys = os.getenv("GEMINI_API_KEYS", "").split(",")
gemini_keys = [k.strip() for k in gemini_keys if k.strip()]

if not gemini_keys:
    raise RuntimeError("No GEMINI_API_KEYS found in environment!")

gemini_cycle = cycle(gemini_keys)
_current_gemini_key = next(gemini_cycle)

def get_gemini_key():
    """Get the current Gemini API key"""
    return _current_gemini_key

def rotate_gemini_key():
    """Rotate to the next Gemini API key (when quota exceeded)"""
    global _current_gemini_key
    _current_gemini_key = next(gemini_cycle)
    log_message(f"Rotated to new Gemini API key: {_current_gemini_key}", level="warning")
    return _current_gemini_key

# ---------- Gemini Helper Function ----------
def make_gemini_request(prompt, model="gemini-2.0-flash-lite", max_retries=3):
    """
    Make a Gemini API request with automatic key rotation on quota errors.
    """
    import google.generativeai as genai

    for attempt in range(max_retries):
        try:
            # Configure SDK with current key
            genai.configure(api_key=get_gemini_key())

            # Create the model
            model_instance = genai.GenerativeModel(model)

            # Generate response
            response = model_instance.generate_content(prompt)
            return response.text  # or response.candidates, depending on usage

        except Exception as e:
            error_message = str(e)

            # Case 1: Quota exceeded (429)
            if "429" in error_message or "quota" in error_message.lower():
                rotate_gemini_key()
                time.sleep(2)  # short delay before retry
                continue

            # Case 2: Network/HTTP error
            elif isinstance(e, requests.exceptions.RequestException):
                log_message(f"Network issue: {e}. Retrying...", level="warning")
                time.sleep(2)
                continue

            # Any other error → stop immediately
            raise e

    raise RuntimeError("Gemini request failed after rotating all keys")

# ---------- Other API Keys ----------
def get_amadeus_credentials():
    return get_secret("AMADEUS_CLIENT_ID"), get_secret("AMADEUS_CLIENT_SECRET")

def get_openweather_key():
    return get_secret("OPENWEATHER_API_KEY")

def get_opentripmap_key():
    return get_secret("OPENTRIPMAP_API_KEY")