"""
app.py - Simple Weather Forecast Web App (Demo)
------------------------------------------------
This is a beginner-friendly Gradio app for Hugging Face Spaces.

⚠️ NOTE:
This demo does not use real-time weather APIs (so no API key needed).
It generates a mock forecast based on simple rules.
You can later connect it to real APIs like OpenWeatherMap.

How to run (in Hugging Face Spaces or Colab):
1. pip install -r requirements.txt
2. python app.py
3. Open the public link.
"""

import gradio as gr
import random
from datetime import datetime, timedelta

# --- Simple mock forecast generator ---
def get_mock_forecast(city, days):
    if not city or days <= 0:
        return "❌ Please enter a city and valid number of days."

    forecasts = []
    conditions = ["☀️ Sunny", "🌤️ Partly Cloudy", "🌧️ Rainy", "🌩️ Thunderstorm", "❄️ Snow"]

    today = datetime.now()
    for i in range(days):
        date = (today + timedelta(days=i)).strftime("%A, %d %b %Y")
        temp = random.randint(10, 40)  # fake temperature in Celsius
        condition = random.choice(conditions)
        forecasts.append(f"{date} — {condition}, {temp}°C")

    return "\n".join(forecasts)

# --- Gradio UI ---
with gr.Blocks() as demo:
    gr.Markdown("## 🌦️ Simple Weather Forecast App (Demo)")

    with gr.Row():
        city = gr.Textbox(label="Enter City", placeholder="e.g. London")
        days = gr.Slider(1, 7, value=3, step=1, label="Forecast Days")

    forecast_btn = gr.Button("Get Forecast")
    output = gr.Textbox(label="Forecast", lines=8)

    forecast_btn.click(get_mock_forecast, inputs=[city, days], outputs=output)

# Launch app
if __name__ == "__main__":
    demo.launch()