main.py

from fastapi import FastAPI, HTTPException
from argopy import DataFetcher
import matplotlib.pyplot as plt
from fastapi.responses import StreamingResponse
import io


app = FastAPI()

@app.get("/plot_trajectory")
def plot_trajectory(lon_min: float, lon_max: float, lat_min: float, lat_max: float, 
                    depth_min: float, depth_max: float, 
                    date_start: str, date_end: str):
    try:
        # Create data fetcher with user inputs
        f = DataFetcher().region([lon_min, lon_max, lat_min, lat_max, depth_min, depth_max, date_start, date_end])
        
        # Plotting
        plt.figure()
        f.plot('trajectory', add_legend=False)
        buf = io.BytesIO()
        plt.savefig(buf, format='png')
        buf.seek(0)
        plt.close()

        return StreamingResponse(buf, media_type="image/png")

    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)