# Multi-stage Dockerfile for production deployment
# Stage 1: Build frontend
FROM node:20-alpine AS frontend-builder

WORKDIR /app/frontend

# Copy frontend files
COPY frontend/package*.json ./
RUN npm ci

COPY frontend/ ./
RUN npm run build

# Stage 2: Python backend
FROM python:3.12-slim

WORKDIR /app

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

# Copy Python dependencies
COPY pyproject.toml ./
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -e .

# Copy application code
COPY lang_agent/ ./lang_agent/
COPY configs/ ./configs/
COPY scripts/ ./scripts/
COPY assets/ ./assets/
COPY static/ ./static/

# Copy built frontend from stage 1
COPY --from=frontend-builder /app/frontend/dist ./frontend/dist

# Set environment variables
ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1

# Expose port
EXPOSE 8500

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD curl -f http://localhost:8500/health || exit 1

# Create entrypoint script to wait for DB
# Uses Python to check database connection (more reliable than psql)
RUN echo '#!/bin/bash\n\
set -e\n\
echo "Waiting for database to be ready..."\n\
python3 << EOF\n\
import sys\n\
import time\n\
import psycopg\n\
\n\
max_attempts = 30\n\
conn_str = "${CONN_STR}"\n\
\n\
for i in range(max_attempts):\n\
    try:\n\
        with psycopg.connect(conn_str, connect_timeout=2) as conn:\n\
            with conn.cursor() as cur:\n\
                cur.execute("SELECT 1")\n\
        print("Database is ready!")\n\
        sys.exit(0)\n\
    except Exception as e:\n\
        if i == max_attempts - 1:\n\
            print(f"Warning: Database not ready after {max_attempts * 2} seconds, continuing anyway...")\n\
            print(f"Error: {e}")\n\
            sys.exit(0)\n\
        print(f"Database is unavailable - sleeping (attempt {i+1}/{max_attempts})")\n\
        time.sleep(2)\n\
EOF\n\
exec "$@"' > /entrypoint.sh && chmod +x /entrypoint.sh

ENTRYPOINT ["/entrypoint.sh"]

# Run the combined server
CMD ["python", "-m", "uvicorn", "lang_agent.fastapi_server.combined:app", "--host", "0.0.0.0", "--port", "8500"]