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use futures_core::future::BoxFuture;
use sqlx_core::{transaction::TransactionManager, Error as SqlxError};

use crate::{database::Exasol, ExaConnection};

#[derive(Debug, Clone, Copy)]
pub struct ExaTransactionManager;

impl TransactionManager for ExaTransactionManager {
    type Database = Exasol;

    fn begin(conn: &mut ExaConnection) -> BoxFuture<'_, Result<(), SqlxError>> {
        Box::pin(async move { conn.ws.begin() })
    }

    fn commit(conn: &mut ExaConnection) -> BoxFuture<'_, Result<(), SqlxError>> {
        Box::pin(async move { conn.ws.commit().await })
    }

    fn rollback(conn: &mut ExaConnection) -> BoxFuture<'_, Result<(), SqlxError>> {
        Box::pin(async move { conn.ws.rollback().await })
    }

    fn start_rollback(conn: &mut ExaConnection) {
        // We only need to rollback if the transaction is still open.
        if conn.ws.attributes.open_transaction {
            conn.ws.pending_rollback = true;
        }
    }
}