# Use an official Python runtime as a parent image
FROM python:3.10-slim

# Set the working directory in the container
WORKDIR /app

# Install system dependencies required by the app, especially ffmpeg
RUN apt-get update && apt-get install -y --no-install-recommends ffmpeg && \
    rm -rf /var/lib/apt/lists/*

# Copy the requirements file into the container
COPY requirements.txt .

# Install any needed packages specified in requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application's code into the container
# This includes app.py and the 'static' folder
COPY . .

# Tell Docker that the container listens on this port (Hugging Face standard)
EXPOSE 7860

# Define the command to run the application using Gunicorn
# Binds to all network interfaces on port 7860
# --workers 1 is safe for free tiers. --threads 4 helps handle concurrent requests.
CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--workers", "1", "--threads", "4", "app:app"]