# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import json
import os

from google.cloud import secretmanager
import requests


def get_secret(secret_id):
    """Get secret from Secret Manager."""
    client = secretmanager.SecretManagerServiceClient()
    project_id = os.environ.get("GOOGLE_CLOUD_PROJECT")
    name = f"projects/{project_id}/secrets/{secret_id}/versions/latest"
    response = client.access_secret_version(request={"name": name})
    return response.payload.data.decode("UTF-8")


def get_weather(request):
    """Responds to an HTTP request with weather data."""

    # Get location from request parameters (e.g., city, lat/lon)
    city = request.args.get("city")
    lat = request.args.get("lat")
    lon = request.args.get("lon")

    if not city and not (lat and lon):
        return "Please provide either 'city' or 'lat' and 'lon' parameters.", 400

    try:
        api_key = get_secret("OPENWEATHER_API_KEY")
    except Exception as e:
        return f"Error fetching API key from Secret Manager: {e}", 500

    if not api_key:
        return "API key not configured.", 500

    base_url = "http://api.openweathermap.org/data/2.5/weather"
    params = {"appid": api_key, "units": "metric"}  # Or 'imperial' for Fahrenheit

    if city:
        params["q"] = city
    elif lat and lon:
        params["lat"] = lat
        params["lon"] = lon

    try:
        response = requests.get(base_url, params=params)
        response.raise_for_status()  # Raise HTTPError for bad responses (4xx or 5xx)
        weather_data = response.json()

        # Construct the response with transformed data
        custom_weather_response = {
            "city": weather_data["name"],
            "temperature": int((weather_data["main"]["temp"])),
            "description": weather_data["weather"][0]["description"],
            "humidity": weather_data["main"]["humidity"],
        }

        return (
            json.dumps(custom_weather_response),
            200,
            {"Content-Type": "application/json"},
        )
        # return json.dumps(weather_data), 200, {'Content-Type': 'application/json'}

    except requests.exceptions.HTTPError as e:
        return f"Error from OpenWeatherMap API: {e}", e.response.status_code
    except requests.exceptions.RequestException as e:
        return f"Error connecting to OpenWeatherMap API: {e}", 500
    except Exception as e:
        return f"An unexpected error occurred: {e}", 500


if __name__ == "__main__":
    # Example of local testing (optional)
    # To run locally: python main.py
    class MockRequest:
        def __init__(self, args):
            self.args = args

    mock_request_city = MockRequest({"city": "London"})
    mock_request_lat_lon = MockRequest({"lat": "51.5", "lon": "-0.12"})

    city_weather, status_city, headers_city = get_weather(mock_request_city)
    print("Weather for London:")
    print(city_weather)

    lat_lon_weather, status_lat_lon, headers_lat_lon = get_weather(mock_request_lat_lon)
    print("\nWeather for Lat/Lon (London):")
    print(lat_lon_weather)