Dockerfile.backend

# Stage 1: Build dependencies
FROM python:3.10-slim-bullseye as builder

# Set environment variables
ENV PYTHONPATH=/app \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1 \
    DEBIAN_FRONTEND=noninteractive

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    python3-dev \
    cmake \
    poppler-utils \
    tesseract-ocr \
    tesseract-ocr-eng \
    postgresql-client \
    libpq-dev \
    wget \
    curl \
    gfortran \
    && rm -rf /var/lib/apt/lists/*

# Create and activate virtual environment
WORKDIR /app
COPY requirements.txt .

# Create virtual environment and install dependencies
RUN python -m venv /opt/venv && \
    . /opt/venv/bin/activate && \
    pip install --upgrade pip setuptools wheel && \
    # Install numpy and scikit-learn first with binary preference
    pip install --prefer-binary \
        numpy==1.24.3 \
        scikit-learn==1.2.2 && \
    # Install remaining requirements
    pip install --prefer-binary -r requirements.txt

# Stage 2: Runtime
FROM python:3.10-slim-bullseye as runtime

# Set environment variables
ENV PYTHONPATH=/app \
    PYTHONUNBUFFERED=1 \
    PATH="/opt/venv/bin:$PATH"

# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommends \
    poppler-utils \
    tesseract-ocr \
    tesseract-ocr-eng \
    postgresql-client \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv

# Set working directory and copy application code
WORKDIR /app
COPY . .

# Install wait-for-it script
ADD https://raw.githubusercontent.com/vishnubob/wait-for-it/master/wait-for-it.sh /wait-for-it.sh
RUN chmod +x /wait-for-it.sh

# Set up health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Run the application
CMD ["/bin/sh", "-c", "/wait-for-it.sh postgres:5432 -t 60 -- /wait-for-it.sh redis:6379 -t 60 -- uvicorn app.main:app --host 0.0.0.0 --port 8000"]