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use crate::any::{Any, AnyConnection, AnyQueryResult, AnyRow, AnyStatement, AnyTypeInfo};
use crate::describe::Describe;
use crate::error::Error;
use crate::executor::{Execute, Executor};
use either::Either;
use futures_core::future::BoxFuture;
use futures_core::stream::BoxStream;

impl<'c> Executor<'c> for &'c mut AnyConnection {
    type Database = Any;

    fn fetch_many<'e, 'q: 'e, E: 'q>(
        self,
        mut query: E,
    ) -> BoxStream<'e, Result<Either<AnyQueryResult, AnyRow>, Error>>
    where
        'c: 'e,
        E: Execute<'q, Any>,
    {
        let arguments = query.take_arguments();
        self.backend.fetch_many(query.sql(), arguments)
    }

    fn fetch_optional<'e, 'q: 'e, E: 'q>(
        self,
        mut query: E,
    ) -> BoxFuture<'e, Result<Option<AnyRow>, Error>>
    where
        'c: 'e,
        E: Execute<'q, Self::Database>,
    {
        let arguments = query.take_arguments();
        self.backend.fetch_optional(query.sql(), arguments)
    }

    fn prepare_with<'e, 'q: 'e>(
        self,
        sql: &'q str,
        parameters: &[AnyTypeInfo],
    ) -> BoxFuture<'e, Result<AnyStatement<'q>, Error>>
    where
        'c: 'e,
    {
        self.backend.prepare_with(sql, parameters)
    }

    fn describe<'e, 'q: 'e>(
        self,
        sql: &'q str,
    ) -> BoxFuture<'e, Result<Describe<Self::Database>, Error>>
    where
        'c: 'e,
    {
        self.backend.describe(sql)
    }
}