#!/bin/bash
set -e

# Generate a .env file from environment variables (e.g., Hugging Face Secrets)
# By default, capture the common keys this app uses. Override with ENV_KEYS.
ENV_PATH=${ENV_PATH:-"/app/.env"}
KEYS=${ENV_KEYS:-"SECRET_KEY DATABASE_URL PORT"}

# Try to write to ENV_PATH, fall back to /tmp if not writable
if ! ( mkdir -p "$(dirname "$ENV_PATH")" >/dev/null 2>&1 && touch "$ENV_PATH" >/dev/null 2>&1 ); then
  echo "[warn] Cannot write to $ENV_PATH; falling back to /tmp/.env" >&2
  ENV_PATH="/tmp/.env"
  : > "$ENV_PATH"  # ensure file exists
fi

echo "# Generated by docker-entrypoint.sh" > "$ENV_PATH"
for key in $KEYS; do
  val=$(printenv "$key")
  if [ -n "$val" ]; then
    printf "%s=%s\n" "$key" "$val" >> "$ENV_PATH"
  fi
done

# Export path so the app can load it explicitly if needed
export DOTENV_FILE="$ENV_PATH"

# Apply DB migrations (works for SQLite or external DB via DATABASE_URL)
if command -v alembic >/dev/null 2>&1; then
  if ! alembic upgrade head; then
    echo "[warn] Alembic migration failed; attempting fallback DB" >&2
    if [ -n "$DATABASE_URL" ]; then
      # Fallback to a local SQLite DB in /tmp when external DB is unreachable
      export DATABASE_URL="sqlite:////tmp/ai_schedule.db"
      printf "DATABASE_URL=%s\n" "$DATABASE_URL" >> "$ENV_PATH"
      if ! alembic upgrade head; then
        echo "[warn] Alembic migration failed on fallback as well; proceeding to start app" >&2
      fi
    else
      echo "[warn] No DATABASE_URL set; using default app config" >&2
    fi
  fi
fi

exec "$@"