use crate::selection::Selection;
use crate::selection_function_param;
use crate::selection_functions::types::{get_buffer, SFArguments, SFError, SFResult};
use crate::state::EditorState;

selection_function_param! {
    name: character_structural,
    param_type: usize,
    niladic: |(param, es): (usize, &EditorState)| {
        let buf = get_buffer(es, es.current_buffer_id)?;
        Ok(Selection::Position {
            buffer_id: es.current_buffer_id,
            pos: usize::min(param, buf.max_pos())

        }) },
    monadic_rank0: |_, buffer_id, pos| Ok(Selection::Position {buffer_id, pos}),
    monadic_rank1: |(param, _), buffer_id, int| Ok(Selection::Position {buffer_id, pos: usize::min(int.end, *param)})
}

selection_function_param! {
    name: character_sequential,
    param_type: usize,
    niladic: |(param, es): (usize, &EditorState)| {
        let buf = get_buffer(es, es.current_buffer_id)?;
        Ok(Selection::Position {
            buffer_id: es.current_buffer_id,
            pos: usize::min(param, buf.max_pos()),
        })
    },
    monadic_rank0: |(param, es), buffer_id, pos| {
        let buf = get_buffer(es, buffer_id)?;
        Ok(Selection::Position {buffer_id, pos: usize::min(pos+*param, buf.max_pos())})
    },
    monadic_rank1: |(param, es), buffer_id, int| {
        let buf = get_buffer(es, buffer_id)?;
        Ok(Selection::Position {buffer_id, pos: usize::min(int.end+*param, buf.max_pos())})
    }
}