#!/usr/bin/env python3
"""
Initialize poweron_chatbot database for the Chatbot feature.

Creates the poweron_chatbot database if it does not exist.
Uses DB_CHATBOT_* config (falls back to DB_*).
Tables (ChatbotConversation, ChatbotMessage, ChatbotDocument, ChatbotLog) are
auto-created by the connector on first use.

Usage:
    python script_db_init_chatbot.py [--dry-run]
"""

import os
import sys
import argparse
import logging
from pathlib import Path

scriptPath = Path(__file__).resolve()
gatewayPath = scriptPath.parent.parent
sys.path.insert(0, str(gatewayPath))
os.chdir(str(gatewayPath))

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s",
)
logger = logging.getLogger(__name__)

import psycopg2
from modules.shared.configuration import APP_CONFIG

DB_NAME = "poweron_chatbot"
CONFIG_PREFIX = "DB_CHATBOT"


def _get_config():
    """Get DB config: DB_CHATBOT_* with fallback to DB_*."""
    host = APP_CONFIG.get(f"{CONFIG_PREFIX}_HOST") or APP_CONFIG.get("DB_HOST", "localhost")
    port = int(APP_CONFIG.get(f"{CONFIG_PREFIX}_PORT") or APP_CONFIG.get("DB_PORT", "5432"))
    user = APP_CONFIG.get(f"{CONFIG_PREFIX}_USER") or APP_CONFIG.get("DB_USER")
    password = (
        APP_CONFIG.get(f"{CONFIG_PREFIX}_PASSWORD_SECRET")
        or APP_CONFIG.get(f"{CONFIG_PREFIX}_PASSWORD")
        or APP_CONFIG.get("DB_PASSWORD_SECRET")
        or APP_CONFIG.get("DB_PASSWORD")
    )
    return {"host": host, "port": port, "user": user, "password": password}


def init_chatbot_db(dry_run: bool = False) -> bool:
    """Create poweron_chatbot database if it does not exist."""
    config = _get_config()
    if not config["user"] or not config["password"]:
        logger.error("DB_USER and DB_PASSWORD (or DB_CHATBOT_*) required")
        return False

    try:
        conn = psycopg2.connect(
            host=config["host"],
            port=config["port"],
            database="postgres",
            user=config["user"],
            password=config["password"],
        )
        conn.autocommit = True

        with conn.cursor() as cur:
            cur.execute(
                "SELECT 1 FROM pg_database WHERE datname = %s",
                (DB_NAME,),
            )
            exists = cur.fetchone() is not None

            if exists:
                logger.info(f"Database {DB_NAME} already exists")
            else:
                if dry_run:
                    logger.info(f"[DRY-RUN] Would create database {DB_NAME}")
                else:
                    cur.execute(f'CREATE DATABASE "{DB_NAME}"')
                    logger.info(f"Created database {DB_NAME}")

        conn.close()
        return True
    except Exception as e:
        logger.error(f"Failed to init {DB_NAME}: {e}")
        return False


def main():
    parser = argparse.ArgumentParser(description="Initialize poweron_chatbot database")
    parser.add_argument("--dry-run", action="store_true", help="Do not create, only report")
    args = parser.parse_args()
    ok = init_chatbot_db(dry_run=args.dry_run)
    sys.exit(0 if ok else 1)


if __name__ == "__main__":
    main()