# 1. Use Node 20 Slim (Debian)
FROM node:20-slim

# --- CACHE BUSTER ---
# Updated timestamp to force this new logic to deploy
ENV N8N_VERSION_FORCE=v2_watchdog_upgrade_dec18

# 2. Install System Tools
# We add 'curl' because we need it to check n8n's health locally
RUN apt-get update && \
    apt-get install -y graphicsmagick git tini postgresql-client curl && \
    rm -rf /var/lib/apt/lists/*

# 3. Install n8n V2.0.2 (Pinned for Stability)
RUN npm cache clean --force && \
    npm install -g n8n@2.0.2

# 4. Storage & Permissions
RUN mkdir -p /home/node/.n8n && \
    chown -R node:node /home/node/.n8n

# 5. Switch User
USER node

# 6. The "Internal Affairs" Watchdog
# This script waits for n8n to start, then checks n8n's own health status every 60s.
# If n8n reports "503 Database not ready", this script kills the container to force a restart.
RUN echo '#!/bin/sh' > /home/node/start.sh && \
    echo 'echo "--- Starting n8n V2 with Healthz Monitor ---"' >> /home/node/start.sh && \
    echo 'n8n start &' >> /home/node/start.sh && \
    echo 'N8N_PID=$!' >> /home/node/start.sh && \
    echo 'echo "Waiting 30s for boot..."' >> /home/node/start.sh && \
    echo 'sleep 30' >> /home/node/start.sh && \
    echo 'while true; do' >> /home/node/start.sh && \
    echo '  sleep 60' >> /home/node/start.sh && \
    echo '  # Check n8n internal health endpoint' >> /home/node/start.sh && \
    echo '  if ! curl -f http://localhost:7860/healthz > /dev/null 2>&1; then' >> /home/node/start.sh && \
    echo '    echo "❌ n8n is sick (503/Crash)! Killing process to force restart..."' >> /home/node/start.sh && \
    echo '    kill $N8N_PID' >> /home/node/start.sh && \
    echo '    exit 1' >> /home/node/start.sh && \
    echo '  fi' >> /home/node/start.sh && \
    echo 'done' >> /home/node/start.sh && \
    echo 'wait $N8N_PID' >> /home/node/start.sh && \
    chmod +x /home/node/start.sh

# 7. V2 Configuration Variables
ENV DB_TYPE=postgresdb
ENV DB_POSTGRESDB_SCHEMA=public
ENV N8N_PORT=7860
ENV N8N_HOST=0.0.0.0
ENV N8N_ENFORCE_SETTINGS_FILE_PERMISSIONS=false
ENV N8N_RUNNERS_ENABLED=true
ENV N8N_BLOCK_ENV_ACCESS_IN_NODE=true

# 8. Open Port
EXPOSE 7860

# 9. Start
ENTRYPOINT ["/usr/bin/tini", "--"]
CMD ["/home/node/start.sh"]