from fastapi import FastAPI, UploadFile, File
from fastapi.responses import FileResponse
import cv2
import subprocess
import uuid
import os

app = FastAPI()

os.umask(0o077)

def detect_product_in_frame(frame):
    return (100, 50, 400, 400)

@app.post("/process_video/")
async def process_video(file: UploadFile = File(...)):
    input_filename = f"/tmp/input_{uuid.uuid4()}.mp4"
    output_filename = f"/tmp/output_{uuid.uuid4()}.mp4"
    
    with open(input_filename, "wb") as f:
        f.write(await file.read())

    cap = cv2.VideoCapture(input_filename)
    success, frame = cap.read()
    if not success:
        return {"error": "Não foi possível ler o vídeo."}
    
    roi_box = detect_product_in_frame(frame)
    cap.release()

    if roi_box:
        x, y, w, h = roi_box
        crop_cmd = [
            'ffmpeg',
            '-i', input_filename,
            '-vf', f"crop={w}:{h}:{x}:{y}",
            '-c:a', 'copy',
            output_filename
        ]
        subprocess.run(crop_cmd)

        os.remove(input_filename)
        return FileResponse(output_filename, media_type="video/mp4", filename="cropped_video.mp4")
    else:
        return {"error": "Não foi possível detectar o produto para realizar o crop."}