//! Pretty (and colored) dialog for asking [Y/n] for the end user.
//!
//! Example:
//!     "Do you want to overwrite 'archive.targz'? [Y/n]"

use std::{
    borrow::Cow,
    io::{self, Write},
};

use crate::utils::colors;

/// Represents a confirmation dialog
pub struct Confirmation<'a> {
    pub prompt: &'a str,
    pub placeholder: Option<&'a str>,
}

impl<'a> Confirmation<'a> {
    pub const fn new(prompt: &'a str, pattern: Option<&'a str>) -> Self {
        Self { prompt, placeholder: pattern }
    }

    pub fn ask(&self, substitute: Option<&'a str>) -> crate::Result<bool> {
        let message = match (self.placeholder, substitute) {
            (None, _) => Cow::Borrowed(self.prompt),
            (Some(_), None) => return Err(crate::Error::InternalError),
            (Some(placeholder), Some(subs)) => Cow::Owned(self.prompt.replace(placeholder, subs)),
        };

        loop {
            print!("{} [{}Y{}/{}n{}] ", message, *colors::GREEN, *colors::RESET, *colors::RED, *colors::RESET);
            io::stdout().flush()?;

            let mut answer = String::new();
            io::stdin().read_line(&mut answer)?;
            let trimmed_answer = answer.trim();

            if trimmed_answer.is_empty() {
                return Ok(true);
            }

            match trimmed_answer.to_ascii_lowercase().as_ref() {
                "y" | "yes" => return Ok(true),
                "n" | "no" => return Ok(false),
                _ => continue, // Try again
            }
        }
    }
}