// file: ks-store/src/postgres/query/health_queries.rs
// version: 4

//! PostgreSQL health and diagnostic SQL queries.

pub(crate) async fn run_health_check(pool: &sqlx::PgPool) -> ks_core::Result<()> {
    let query_result = sqlx::query_scalar::<sqlx::Postgres, i32>("SELECT 1").fetch_one(pool).await;
    return match query_result {
        std::result::Result::Ok(_value) => std::result::Result::Ok(()),
        std::result::Result::Err(error) => std::result::Result::Err(ks_core::Error::db(format!(
            "postgres healthcheck failed: {error}"
        ))),
    };
}

pub(crate) async fn load_current_schema(
    pool: &sqlx::PgPool,
) -> ks_core::Result<std::string::String> {
    let query_result =
        sqlx::query_scalar::<sqlx::Postgres, std::string::String>("SELECT current_schema()")
            .fetch_one(pool)
            .await;
    return match query_result {
        std::result::Result::Ok(schema) => std::result::Result::Ok(schema),
        std::result::Result::Err(error) => std::result::Result::Err(ks_core::Error::db(format!(
            "postgres current schema query failed: {error}"
        ))),
    };
}

pub(crate) async fn load_server_version(
    pool: &sqlx::PgPool,
) -> ks_core::Result<std::string::String> {
    let query_result =
        sqlx::query_scalar::<sqlx::Postgres, std::string::String>("SELECT version()")
            .fetch_one(pool)
            .await;
    return match query_result {
        std::result::Result::Ok(version) => std::result::Result::Ok(version),
        std::result::Result::Err(error) => std::result::Result::Err(ks_core::Error::db(format!(
            "postgres version query failed: {error}"
        ))),
    };
}