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use crate::{handles::Statement, Error, Parameter};

mod tuple;

/// SQL Parameters used to execute a query.
///
/// ODBC allows to place question marks (`?`) in the statement text as placeholders. For each such
/// placeholder a parameter needs to be bound to the statement before executing it.
pub unsafe trait ParameterCollection {
    /// # Safety
    ///
    /// Implementers should take care that the values bound by this method to the statement live at
    /// least for the Duration of `self`. The most straight forward way of achieving this is of
    /// course, to bind members.
    unsafe fn bind_parameters_to(&self, stmt: &mut Statement) -> Result<(), Error>;
}

unsafe impl<T: Parameter> ParameterCollection for T {
    unsafe fn bind_parameters_to(&self, stmt: &mut Statement) -> Result<(), Error> {
        self.bind_parameter_to(stmt, 1)
    }
}

unsafe impl<T> ParameterCollection for &[T]
where
    T: Parameter,
{
    unsafe fn bind_parameters_to(&self, stmt: &mut Statement) -> Result<(), Error> {
        for (index, parameter) in self.iter().enumerate() {
            parameter.bind_parameter_to(stmt, index as u16 + 1)?;
        }
        Ok(())
    }
}