Dockerfile

# Use an official Python runtime as a parent image
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1
ENV PIP_NO_CACHE_DIR=1
ENV PIP_DISABLE_PIP_VERSION_CHECK=1

# Install system dependencies in separate layers for better caching
RUN apt-get update && apt-get install -y --no-install-recommends \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Install build dependencies (will be cached separately)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Install OCR and PDF dependencies (will be cached separately)
RUN apt-get update && apt-get install -y --no-install-recommends \
    tesseract-ocr \
    tesseract-ocr-eng \
    poppler-utils \
    && rm -rf /var/lib/apt/lists/*

# Install minimal OpenCV dependencies (will be cached separately)
RUN apt-get update && apt-get install -y --no-install-recommends \
    libgl1-mesa-glx \
    libglib2.0-0 \
    libsm6 \
    libxext6 \
    libxrender-dev \
    libgomp1 \
    && rm -rf /var/lib/apt/lists/*

# Set work directory
WORKDIR /app

# Copy and install Python dependencies first (for better caching)
COPY Backend/requirements.txt /app/
RUN pip install --no-cache-dir --upgrade pip setuptools wheel
RUN pip install --no-cache-dir -r requirements.txt

# Remove build dependencies to reduce image size
RUN apt-get purge -y --auto-remove build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy project files (this layer will change most often)
COPY Backend/ /app/

# Expose port
EXPOSE 7860

# Default command
CMD ["python", "app.py"]