# Use Python 3.11 slim as base image
FROM python:3.11-slim AS builder

# Set working directory
WORKDIR /app

# Install system dependencies required for OpenCV and other packages
RUN apt-get update && apt-get install -y \
    build-essential \
    libgl1-mesa-glx \
    libglib2.0-0 \
    libsm6 \
    libxext6 \
    libxrender-dev \
    cmake \
    && rm -rf /var/lib/apt/lists/*

# Create and activate virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

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

# Disable numba caching by setting an environment variable
RUN echo "NUMBA_CACHE_DIR=/tmp" >> /etc/environment

# Final stage
FROM python:3.11-slim

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

# Set environment variables
ENV PATH="/opt/venv/bin:$PATH" \
    PYTHONUNBUFFERED=1 \
    GRADIO_SERVER_NAME=0.0.0.0 \
    GRADIO_SERVER_PORT=7860 \
    NUMBA_CACHE_DIR=/tmp \
    U2NET_HOME=/app/.u2net \
    REMBG_CACHE_DIR=/app/.u2net

# Install runtime system dependencies
RUN apt-get update && apt-get install -y \
    libgl1-mesa-glx \
    libglib2.0-0 \
    libsm6 \
    libxext6 \
    libxrender-dev \
    && rm -rf /var/lib/apt/lists/*

# Set working directory
WORKDIR /app

# Copy application code
COPY . ./

# Create necessary directories with appropriate permissions
RUN mkdir -p storage/uploads storage/processed && \
    mkdir -p /app/.u2net && \
    chmod 777 /app/.u2net storage/uploads storage/processed

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

# Switch to non-root user
USER appuser

# Ensure required Python imports are pre-compiled (optional for optimization)
RUN python -m compileall .

# Expose port
EXPOSE 7860

# Set default command
CMD ["python", "app.py"]