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use crate::api::{EndpointArgumentApi, ErrorApi};
use crate::err_msg;
use crate::{ArgDecodeInput, DynArgInput};

pub struct EndpointDynArgLoader<AA>
where
    AA: EndpointArgumentApi + 'static,
{
    api: AA,
    current_index: i32,
    num_arguments: i32,
}

impl<AA> EndpointDynArgLoader<AA>
where
    AA: EndpointArgumentApi + 'static,
{
    pub fn new(api: AA) -> Self {
        let num_arguments = api.get_num_arguments();
        EndpointDynArgLoader {
            api,
            current_index: 0,
            num_arguments,
        }
    }
}

impl<AA> ErrorApi for EndpointDynArgLoader<AA>
where
    AA: EndpointArgumentApi + ErrorApi + 'static,
{
    #[inline]
    fn signal_error(&self, message: &[u8]) -> ! {
        self.api.signal_error(message)
    }
}

impl<AA> DynArgInput<ArgDecodeInput<AA>> for EndpointDynArgLoader<AA>
where
    AA: EndpointArgumentApi + Clone + 'static,
{
    fn has_next(&self) -> bool {
        self.current_index < self.num_arguments
    }

    fn next_arg_input(&mut self) -> ArgDecodeInput<AA> {
        if self.current_index >= self.num_arguments {
            self.signal_error(err_msg::ARG_WRONG_NUMBER)
        } else {
            let arg_input = ArgDecodeInput::new(self.api.clone(), self.current_index);
            self.current_index += 1;
            arg_input
        }
    }
}