use std::fmt::Display;

use convert_case::{Case, Casing};
use deunicode::deunicode;

pub mod chapter;
pub mod replacement;
pub mod section;

#[derive(PartialEq, Eq, PartialOrd, Ord)]
pub struct MangledName(String);

impl MangledName {
    pub fn new(name: &str) -> Self {
        let safe_name = name
            // TeX fails to include/input stuff with a colon in it.
            .replace(':', "_")
            // This obviously creates weird extra directories
            .replace('/', "_");

        let ascii_name = deunicode(&safe_name.to_case(Case::Snake)).to_case(Case::Snake);

        Self(ascii_name)
    }

    pub fn from_str_unsafe(name: &str) -> Self {
        Self(name.to_owned())
    }

    pub fn check_mangled(name: &str) -> bool {
        let mangled = Self::new(name);
        let normal = Self::from_str_unsafe(name);

        mangled == normal
    }

    pub fn as_str(&self) -> &str {
        &self.0
    }

    pub fn try_unmangle(self) -> String {
        self.0.to_case(Case::Title)
    }
}
impl Display for MangledName {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(&self.0)
    }
}

#[cfg(test)]
mod test {
    use crate::new::MangledName;

    #[test]
    fn test_names() {
        let name = MangledName::new("Æneid");
        assert_eq!(name.to_string().as_str(), "aeneid");

        let name = MangledName::new("étude");
        assert_eq!(name.to_string().as_str(), "etude");

        let name = MangledName::new("Ästhetik");
        assert_eq!(name.to_string().as_str(), "asthetik");

        let name = MangledName::new("北亰");
        assert_eq!(name.to_string().as_str(), "bei_jing");

        let name = MangledName::new("ᔕᓇᓇ");
        assert_eq!(name.to_string().as_str(), "shanana");

        let name = MangledName::new("げんまい茶");
        assert_eq!(name.to_string().as_str(), "genmai_cha");

        let name = MangledName::new("🦄☣");
        assert_eq!(name.to_string().as_str(), "unicorn_biohazard");
    }
}