use core::panic;

use crate::experimental::trait_based::{
    data::{
        io::{Inputs, Outputs},
        raw::Data,
    },
    element::{DataType, ElementIo, PipelineElement},
};

pub struct Add(pub i32);
impl PipelineElement for Add {
    fn runner(&self) -> fn(&Inputs) -> Outputs {
        |input| {
            if let [Data::Int(i0), Data::Int(i1), ..] = input.inner()[..] {
                (i0 + i1).into()
            } else {
                panic!("Invalid data passed")
            }
        }
    }

    fn signature(&self) -> ElementIo {
        ElementIo {
            inputs: vec![DataType::Int, DataType::Int],
            outputs: vec![DataType::Int],
        }
    }
}

pub struct Subtract(pub i32);
impl PipelineElement for Subtract {
    fn runner(&self) -> fn(&Inputs) -> Outputs {
        |input| {
            if let [Data::Int(i0), Data::Int(i1), ..] = input.inner()[..] {
                (i0 + i1).into()
            } else {
                panic!("Invalid data passed")
            }
        }
    }

    fn signature(&self) -> ElementIo {
        ElementIo {
            inputs: vec![DataType::Int, DataType::Int],
            outputs: vec![DataType::Int],
        }
    }
}

pub struct Stringify;
impl PipelineElement for Stringify {
    fn runner(&self) -> fn(&Inputs) -> Outputs {
        |input| {
            if let [Data::Int(int), ..] = input.inner()[..] {
                int.to_string().into()
            } else {
                panic!("Invalid data passed")
            }
        }
    }

    fn signature(&self) -> ElementIo {
        ElementIo {
            inputs: vec![DataType::Int],
            outputs: vec![DataType::String],
        }
    }
}