"""PostgreSQL connection helpers."""

import os

import psycopg2
from psycopg2.extensions import connection


def db_params() -> dict[str, str]:
    return {
        "host": os.getenv("DB_HOST", "localhost"),
        "port": os.getenv("DB_PORT", "5432"),
        "dbname": os.getenv("DB_NAME", "kairo_dev"),
        "user": os.getenv("DB_USER", "kairo_dev"),
        "password": os.getenv("DB_PASSWORD", "dev_password"),
    }


def get_connection() -> connection:
    p = db_params()
    return psycopg2.connect(
        host=p["host"],
        port=p["port"],
        database=p["dbname"],
        user=p["user"],
        password=p["password"],
    )


def check_db() -> bool:
    conn = get_connection()
    try:
        with conn.cursor() as cur:
            cur.execute("SELECT 1")
            cur.fetchone()
        return True
    finally:
        conn.close()