# 1. Base image
FROM python:3.9-slim

# 2. Prevent __pycache__, buffer logs
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# 3. Define where uploads go and where the database file will live
#    Both should be in a writable location like /tmp
ENV UPLOAD_DIR=/tmp/uploads
# Define the database URL. With instance_path=/tmp in app.py,
# 'sqlite:///patients.db' will resolve to /tmp/patients.db
ENV DATABASE_URL=sqlite:///patients.db

# 4. Set working dir
WORKDIR /app

# 5. System deps
# Install build-essential (for compiling packages), zlib1g-dev and libjpeg-dev
# (often needed by reportlab for image/compression support).
# libsqlite3-dev might be needed for some advanced sqlite features or drivers,
# uncomment if you hit db issues, but usually not required for basic sqlite3.
RUN apt-get update \
 && apt-get install -y --no-install-recommends \
    build-essential \
    zlib1g-dev \
    libjpeg-dev \
    # libsqlite3-dev \
 && rm -rf /var/lib/apt/lists/*

# 6. Python deps
# Make sure your requirements.txt includes Flask-SQLAlchemy
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# 7. Copy app code
COPY . .

# 8. Pre-create the uploads directory in /tmp
#    The Flask instance path (/tmp) will be created by Flask itself when needed
#    within the writable /tmp directory.
RUN mkdir -p "${UPLOAD_DIR}/pdfs"

# 9. Entrypoint: Ensure runtime directories exist, then launch gunicorn
#    The database file and tables will be created automatically by db.create_all()
#    when the Flask app context is first used (which Gunicorn does on boot).
RUN printf '#!/bin/sh\n\
# Ensure the upload directory exists at runtime (redundant but safe for /tmp)
# Flask instance_path=/tmp is handled by app.py and directory creation within /tmp\n\
mkdir -p "${UPLOAD_DIR}/pdfs"\n\
\n\
# Execute Gunicorn to run the Flask app\n\
# Pass environment variables explicitly or rely on Docker --env flags\n\
# It\'s better to pass sensitive vars like API keys/Twilio via --env flags when running docker\n\
exec gunicorn --workers 4 --bind 0.0.0.0:7860 app:app\n' \
 > /entrypoint.sh \
 && chmod +x /entrypoint.sh

# 10. Expose the port Gunicorn is binding to
EXPOSE 7860

# 11. Set the entrypoint
ENTRYPOINT ["/entrypoint.sh"]

# Important note for production persistence with SQLite:
# The patients.db file and uploaded PDFs will be created inside the container\'s /tmp directory.
# To persist this data between container runs or updates, you MUST mount a Docker Volume
# to the /tmp directory when you run the container.
#
# Example using docker run:
# docker run -d -p 7860:7860 -v my_tmp_volume:/tmp -e GENAI_API_KEY="your_key" -e TWILIO_ACCOUNT_SID="..." your_image_name
#
# For production deployments with orchestration (Docker Compose, Kubernetes),
# define volumes and environment variables in their configuration files.