# Tool_OCR Backend Dockerfile
# Multi-stage build for optimized image size

# Stage 1: Build environment
FROM python:3.12-slim as builder

WORKDIR /build

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

# Copy requirements and install dependencies
COPY backend/requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

# Stage 2: Runtime environment
FROM python:3.12-slim

WORKDIR /app

# Install runtime dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    libgl1-mesa-glx \
    libglib2.0-0 \
    libsm6 \
    libxext6 \
    libxrender1 \
    libgomp1 \
    pandoc \
    poppler-utils \
    fonts-dejavu-core \
    fonts-noto-cjk \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Copy Python packages from builder
COPY --from=builder /root/.local /root/.local
ENV PATH=/root/.local/bin:$PATH

# Copy application code
COPY backend/ /app/backend/

# Create necessary directories
RUN mkdir -p /app/backend/uploads/{temp,processed,images} \
    && mkdir -p /app/backend/storage/{markdown,json,exports,results} \
    && mkdir -p /app/backend/models/paddleocr \
    && mkdir -p /app/backend/logs

# Set working directory
WORKDIR /app/backend

# Environment variables
ENV PYTHONUNBUFFERED=1
ENV PYTHONDONTWRITEBYTECODE=1

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Run application
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]