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

# Set environment variables to prevent interactive prompts during installation
ENV DEBIAN_FRONTEND=noninteractive

# Install system dependencies required by the application (only poppler)
RUN apt-get update && apt-get install -y \
    poppler-utils \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

# Create a non-root user for security
RUN useradd --create-home --shell /bin/bash appuser

# Set the working directory in the container
WORKDIR /app

# Copy the requirements file and install Python dependencies
# This is done in a separate layer to leverage Docker's build cache
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application's code into the container
COPY app.py .

# Change ownership of the app directory to the non-root user
RUN chown -R appuser:appuser /app

# Switch to the non-root user
USER appuser

# Expose the port the Gradio app will run on
EXPOSE 7860

# The command to run the Gradio application
# Gradio's launch() method will automatically bind to 0.0.0.0 inside Docker.
CMD ["python", "app.py"]