# ============================
# Build stage
# ============================
FROM python:3.11-slim AS builder

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    gcc \
    g++ \
    && rm -rf /var/lib/apt/lists/*

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

# Copy requirements and install dependencies
COPY requirements.txt .
RUN pip install --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# ============================
# Production stage
# ============================
FROM python:3.11-slim

WORKDIR /app

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Create non-root user
RUN groupadd -r appuser && useradd -r -g appuser appuser

# Create envs directory and copy environment files
RUN mkdir -p /app/envs
COPY --chown=appuser:appuser envs/.env.production /app/envs/.env.production
COPY --chown=appuser:appuser envs/.env.main /app/envs/.env.main

# Copy application code
COPY --chown=appuser:appuser . .

USER appuser

# Health check
HEALTHCHECK --interval=30s --timeout=5s --start-period=30s --retries=3 \
    CMD curl -f http://localhost:7860/health || exit 1

EXPOSE 7860

# Start the application
CMD ["sh", "-c", "ACTIVE_ENV=production uvicorn app.main:app --host 0.0.0.0 --port 7860 --timeout-keep-alive 30"]