#!/bin/bash
# ============================================================
#  HF-VPS — Container Entrypoint
#
#  This script runs once when the Docker container starts.
#  It prepares the environment and hands off to supervisord,
#  which then manages all services for the container lifetime.
#
#  Execution order:
#    1. Create runtime directories (logs, data, public)
#    2. Create /app/.env placeholder (HF Secrets flow in as real env vars)
#    3. Print version info for diagnostics in HF logs
#    4. Validate Nginx config (catches config errors before startup)
#    5. exec supervisord (replaces this process — keeps PID 1 clean)
#
#  set -e: exit immediately on any error (fail fast, visible in HF logs)
# ============================================================

set -e

echo "============================================"
echo "  HF-VPS Starting..."
echo "============================================"

# --- Create required runtime directories ---
# /app/logs  — all service logs (supervisord, nginx, fastapi, redis, etc.)
# /app/data  — SQLite database files and Redis dump.rdb
# /app/public — static files served at / and /static/ by Nginx
mkdir -p /app/logs /app/data /app/public

# --- Create .env placeholder ---
# HF Space Secrets are injected as real environment variables by HF.
# This empty .env ensures python-dotenv doesn't error if it looks for the file.
if [ ! -f /app/.env ]; then
    touch /app/.env
fi

# --- Print version info (visible in HF Space container logs) ---
echo "[init] Python: $(python --version)"
echo "[init] Node:   $(node --version)"
echo "[init] npm:    $(npm --version)"
echo "[init] Redis:  $(redis-server --version | head -1)"
echo "[init] Nginx:  $(nginx -v 2>&1)"

# --- Validate Nginx config before starting ---
# nginx -t checks the config syntax without starting Nginx.
# If config is invalid, we warn but continue (supervisord will handle the error).
nginx -t 2>/dev/null && echo "[init] Nginx config OK" || echo "[init] WARNING: Nginx config check failed"

# --- Hand off to supervisord ---
# exec replaces the shell process with supervisord (keeps PID 1 clean).
# supervisord starts all services defined in its config (redis, fastapi, scheduler, nginx).
echo "[init] Starting all services..."
exec supervisord -c /etc/supervisor/conf.d/supervisord.conf