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

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1
ENV TZ=Asia/Seoul

# Install system dependencies including PostgreSQL client 16
RUN apt-get update && \
    apt-get install -y --no-install-recommends \
        gnupg \
        lsb-release \
        wget \
        ca-certificates \
        tzdata \
        gpg \
        lftp && \
    # Add PostgreSQL Apt Repository
    # Download the key
    wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | \
        # Dearmor the key and save to the keyring directory
        gpg --dearmor -o /usr/share/keyrings/postgresql-archive-keyring.gpg && \
    # Set correct permissions for the keyring file
    chmod 644 /usr/share/keyrings/postgresql-archive-keyring.gpg && \
    # Add the repository source, signed by the keyring
    sh -c 'echo "deb [signed-by=/usr/share/keyrings/postgresql-archive-keyring.gpg] https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list' && \
    # Update again after adding repo
    apt-get update && \
    # Install specific client version
    apt-get install -y --no-install-recommends \
        postgresql-client-16 && \
    # Configure timezone
    ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && \
    # Clean up (remove build dependencies)
    apt-get purge -y --auto-remove wget gnupg lsb-release ca-certificates gpg && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Install Python dependencies
# Using requirements.txt is generally better, but for a simple script:
RUN pip install --no-cache-dir schedule pytz

# Set the working directory in the container
WORKDIR /app

# Copy the Python script into the container
COPY db/backup.py .

# Ensure .ssh directory exists (still good practice, though key might not be used)
# RUN mkdir -p /root/.ssh && chmod 700 /root/.ssh # No longer needed for SSH keys

# Command to run the application
CMD ["python", "backup.py"]