# Multi-stage build for optimized production image
# Stage 1: Build dependencies
FROM python:3.11-slim as builder

WORKDIR /app

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

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

# Stage 2: Production image
FROM python:3.11-slim as production

# Create non-root user for security
RUN groupadd -r telegrambot && useradd -r -g telegrambot telegrambot

WORKDIR /app

# Install runtime dependencies only
RUN apt-get update && apt-get install -y \
    tini \
    netcat-openbsd \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean

# Copy Python dependencies from builder stage
COPY --from=builder /root/.local /home/telegrambot/.local

# Copy application code
COPY app/ ./app/

# Create data directory for SQLite database
RUN mkdir -p /app/data && chown -R telegrambot:telegrambot /app/data

# Set ownership and permissions
RUN chown -R telegrambot:telegrambot /app

USER telegrambot

# Add user's local bin to PATH
ENV PATH=/home/telegrambot/.local/bin:$PATH

# Environment variables with defaults
ENV TELEGRAM_BOT_TOKEN="" \
    CLAUDE_API_KEY="" \
    BACKEND_URL="http://roa-backend:8000" \
    INTERNAL_API_PORT="8002" \
    SQLITE_DB_PATH="/app/data/telegram_bot.db" \
    PYTHONUNBUFFERED=1

# Health check - checks both internal API and bot status
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD python -c "import httpx; import asyncio; asyncio.run(httpx.AsyncClient().get('http://localhost:8002/internal/health'))" || exit 1

# Expose internal API port
EXPOSE 8002

# Use tini as init system for proper signal handling
ENTRYPOINT ["/usr/bin/tini", "--"]

# Run the telegram bot application
CMD ["python", "-m", "app.main"]