# Multi-stage build for Oracle Instant Client + Python Flask
FROM python:3.11.4-slim-buster as oracle_base

# Installing Oracle instant client
WORKDIR /opt/oracle
RUN apt-get update && apt-get install -y libaio1 wget unzip curl \
    && wget https://download.oracle.com/otn_software/linux/instantclient/instantclient-basiclite-linuxx64.zip \
    && unzip instantclient-basiclite-linuxx64.zip \
    && rm -f instantclient-basiclite-linuxx64.zip \
    && cd /opt/oracle/instantclient* \
    && rm -f *jdbc* *occi* *mysql* *README *jar uidrvci genezi adrci \
    && echo /opt/oracle/instantclient* > /etc/ld.so.conf.d/oracle-instantclient.conf \
    && ldconfig

# Application layer
FROM oracle_base
WORKDIR /app

# Copy TNS configuration for Oracle connection
COPY tnsnames.ora /app/tnsnames.ora
COPY requirements.txt /app/requirements.txt

# Install Python dependencies
RUN pip3 install -r requirements.txt

# Copy application code
COPY . .

# Health check endpoint
EXPOSE 5000

# Run Flask application
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "admin:app", "--reload", "--access-logfile", "-"]