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//! this whole module is hacky garbage that should be refactored during {T3094} / {T111} (v0.8.0)
use std::ops::Range;
use std::ops::Deref;
use std::borrow::Borrow;
use std::cell::Ref;

use ::api::result::Error;
use ::api::RtObject as ObjectRef;
use ::api::result::{RtResult};
use ::modules::builtins::Type;
use ::system::primitives as rs;


pub fn check_args(count: usize, pos_args: &ObjectRef) -> RtResult<rs::None> {
    match pos_args.as_ref() {
        &Type::Tuple(ref tuple) => {
            if tuple.value.0.len() == count {
                Ok(rs::None())
            } else {
                Err(Error::typerr("Argument mismatch 1"))
            }
        }
        _ => Err(Error::typerr("Expected type tuple for pos_args")),
    }
}

pub fn check_args_range(range: Range<usize>, pos_args: &ObjectRef) -> RtResult<usize> {
    match pos_args.as_ref() {
        &Type::Tuple(ref tuple) => {
            if range.contains(tuple.value.0.len()) {
                Ok(tuple.value.0.len())
            } else {
                Err(Error::typerr(&format!("Expected {:?} args, got {}", range, tuple.value.0.len())))
            }
        }
        _ => Err(Error::typerr("Expected type tuple for pos_args")),
    }
}


pub fn check_kwargs(count: usize, kwargs: &ObjectRef) -> RtResult<rs::None> {
    match kwargs.as_ref() {

        &Type::Dict(ref dict) => {
            let borrowed: Ref<rs::Dict> = dict.value.0.borrow();

            if borrowed.len() == count {
                Ok(rs::None())
            } else {
                Err(Error::typerr("Argument mismatch 2"))
            }
        }
        _ => Err(Error::typerr("Expected type tuple for pos_args")),
    }

}