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use minimad::Alignment;
use crate::compound_style::CompoundStyle;

#[derive(Debug, Clone, Copy)]
pub struct Spacing {
    pub width: usize,
    pub align: Alignment,
}

fn truncate(s: &str, max_chars: usize) -> &str {
    match s.char_indices().nth(max_chars) {
        None => s,
        Some((idx, _)) => &s[..idx],
    }
}

impl Spacing {
    /// compute the number of chars to add left and write of inner_width
    /// to fill outer_width
    #[inline(always)]
    pub fn completions(align: Alignment, inner_width: usize, outer_width: usize) -> (usize, usize) {
        if inner_width >= outer_width {
            return (0, 0);
        }
        match align {
            Alignment::Left | Alignment::Unspecified => (0, outer_width - inner_width),
            Alignment::Center => {
                let lp = (outer_width - inner_width) / 2;
                (lp, outer_width - inner_width - lp)
            },
            Alignment::Right => (outer_width - inner_width, 0),
        }
    }
    #[inline(always)]
    pub fn optional_completions(align: Alignment, inner_width: usize, outer_width: Option<usize>) -> (usize, usize) {
        match outer_width {
            Some(outer_width) => Spacing::completions(align, inner_width, outer_width),
            None => (0, 0),
        }
    }
    #[inline(always)]
    pub fn completions_for(&self, inner_width: usize) -> (usize, usize) {
        Spacing::completions(self.align, inner_width, self.width)
    }
    pub fn print_counted_str(&self, s: &str, str_width: usize, style: &CompoundStyle) {
        if str_width >= self.width {
            // we must truncate
            let s = truncate(s, self.width);
            print!("{}", style.apply_to(s));
        } else {
            // we must complete with spaces
            // This part could be written in a more efficient way
            let (lp, rp) = self.completions_for(str_width);
            let mut con = String::new();
            for _ in 0..lp {
                con.push(' ');
            }
            con.push_str(s);
            for _ in 0..rp {
                con.push(' ');
            }
            print!("{}", style.apply_to(&con));
        }
    }
    pub fn print_str(&self, s: &str, style: &CompoundStyle) {
        self.print_counted_str(s, s.chars().count(), style);
    }
}