# Use an official Python runtime as a parent image
FROM python:3.9-slim

# Set environment variables for Python and Matplotlib
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
ENV MPLCONFIGDIR=/app/.config/matplotlib

# Set the working directory inside the container
WORKDIR /app

# Install system dependencies required by OpenCV and other libraries
RUN apt-get update && apt-get install -y \
    libgl1 \
    libglib2.0-0 \
    libsm6 \
    libxext6 \
    libxrender1 \
    && rm -rf /var/lib/apt/lists/*

# Copy the requirements file into the container at /app
COPY requirements.txt /app/

# Install the dependencies specified in requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

# Create necessary directories and set proper permissions
RUN mkdir -p /app/uploads /app/static/uploads /app/static/results /tmp/flask_sessions /app/flask_sessions /app/models /app/.config/matplotlib && \
    chmod -R 777 /app/uploads /app/static/uploads /app/static/results /tmp/flask_sessions /app/flask_sessions /app/models /app/.config/matplotlib

# Copy the entire application code to /app
COPY . /app/

# Expose the port used by the Flask app
EXPOSE 7860

# Set environment variables for Flask
ENV FLASK_APP=app.py
ENV FLASK_ENV=production
ENV SESSION_FILE_DIR=/app/flask_sessions

# Run the application with Gunicorn, setting workers and timeout
CMD ["gunicorn", "-w", "1", "-b", "0.0.0.0:7860", "--timeout", "120", "app:app"]