Dockerfile.backend

# Build stage
FROM python:3.11.9-slim-bookworm AS builder

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PYTHONHASHSEED=random \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1 \
    PIP_DEFAULT_TIMEOUT=100

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Set working directory
WORKDIR /app

# Copy requirements first to leverage Docker cache
COPY backend/requirements.txt .

# Install Python dependencies
RUN pip install --upgrade pip && \
    pip install --no-cache-dir --prefer-binary -r requirements.txt

# Final stage
FROM python:3.11.9-slim-bookworm

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    wget \
    curl \
    libpq5 \
    libmagic1 \
    tesseract-ocr \
    poppler-utils \
    && rm -rf /var/lib/apt/lists/*

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1 \
    PATH="/root/.local/bin:$PATH" \
    # UID for the non-root user
    APP_UID=1001 \
    APP_GID=1001 \
    APP_USER=appuser \
    APP_HOME=/app

# Create non-root user and set up directories
RUN groupadd -g "${APP_GID}" "${APP_USER}" \
    && useradd --create-home --no-log-init -u "${APP_UID}" -g "${APP_GID}" "${APP_USER}" \
    && mkdir -p "${APP_HOME}" \
    && chown -R "${APP_USER}:${APP_GID}" "${APP_HOME}"

# Set working directory and switch to non-root user
WORKDIR ${APP_HOME}

# Copy installed packages from builder
COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin

# Switch to non-root user
USER ${APP_USER}

# Copy application code
COPY --chown=${APP_USER}:${APP_GID} backend/ ${APP_HOME}/

# Create application directory if it doesn't exist
RUN mkdir -p ${APP_HOME} \
    && chown -R ${APP_USER}:${APP_GID} ${APP_HOME}

# Install requirements
COPY --chown=${APP_USER}:${APP_GID} backend/requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Expose the port the app runs on
EXPOSE 8000

# Command to run the application
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--reload"]