# Use official lightweight Python image
FROM python:3.10-slim

# Set working directory
WORKDIR /app

# Install system dependencies + certificates
RUN apt-get update && apt-get install -y \
    build-essential \
    libpoppler-cpp-dev \
    pkg-config \
    ca-certificates \
    && update-ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first (for caching layers)
COPY requirements.txt .

# Install Python dependencies
RUN pip install --no-cache-dir -r requirements.txt

# Copy project files
COPY . .

# Expose port
EXPOSE 7860

# Run Flask app
CMD ["python", "app.py"]