#!/bin/sh
set -eu

APP_MODULE="${APP_MODULE:-app.main:app}"
APP_HOST="${APP_HOST:-0.0.0.0}"
APP_PORT="${APP_PORT:-8000}"
APP_ENV="${APP_ENV:-production}"
WORKERS="${UVICORN_WORKERS:-1}"
REDIS_WAIT_TIMEOUT="${REDIS_WAIT_TIMEOUT:-30}"

wait_for_redis() {
  if [ -z "${REDIS_URL:-}" ]; then
    echo "REDIS_URL not set, skipping Redis wait"
    return 0
  fi

  echo "Waiting for Redis: ${REDIS_URL}"
  python - <<'PY'
import os
import sys
import time
from urllib.parse import urlparse

redis_url = os.environ.get("REDIS_URL", "")
timeout = int(os.environ.get("REDIS_WAIT_TIMEOUT", "30"))
parsed = urlparse(redis_url)
host = parsed.hostname or "redis"
port = parsed.port or 6379
deadline = time.time() + timeout

while time.time() < deadline:
    try:
        import socket
        with socket.create_connection((host, port), timeout=2):
            print(f"Redis is reachable at {host}:{port}")
            raise SystemExit(0)
    except OSError:
        time.sleep(1)

print(f"Timed out waiting for Redis at {host}:{port}", file=sys.stderr)
raise SystemExit(1)
PY
}

run_migrations() {
  if [ "${RUN_MIGRATIONS:-0}" != "1" ]; then
    echo "RUN_MIGRATIONS disabled, skipping"
    return 0
  fi

  if [ -f alembic.ini ] && command -v alembic >/dev/null 2>&1; then
    echo "Running Alembic migrations"
    alembic upgrade head
    return 0
  fi

  if [ -f manage.py ]; then
    echo "Running Django migrations"
    python manage.py migrate --noinput
    return 0
  fi

  echo "No supported migration command found, skipping"
}

wait_for_redis
run_migrations

echo "Starting application on ${APP_HOST}:${APP_PORT}"
exec python -m uvicorn "${APP_MODULE}" --host "${APP_HOST}" --port "${APP_PORT}" --workers "${WORKERS}"