# Multi-stage build for Land Redistribution API
# This Dockerfile is for deploying from the REMB root directory
FROM python:3.11-slim as builder

# Set working directory
WORKDIR /app

# Install system dependencies required for scientific libraries
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    gcc \
    g++ \
    gfortran \
    libopenblas-dev \
    liblapack-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first for better caching
COPY algorithms/backend/requirements.txt .

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

# Final stage
FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Install runtime dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    libopenblas0 \
    libgomp1 \
    && rm -rf /var/lib/apt/lists/*

# Copy Python 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

# Copy application code from algorithms/backend
COPY algorithms/backend/ .

# Create non-root user
RUN useradd -m -u 1000 appuser && \
    chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose Hugging Face Spaces default port
EXPOSE 7860

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:7860/health')"

# Run the application
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860", "--workers", "1"]