use std::ops::Deref;

use crate::prelude::*;

use serde::{Deserialize, Serialize};

mod impls;

/// Unfortunately, empty-string identifiers are valid Nix...
///
/// This type does not provide a [`Default`] impl, however.
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[derive(Deserialize, Serialize)]
#[serde(untagged)]
pub enum ConvenientAttrPath {
    Dotted(Box<str>),
    Split(Box<[Box<str>]>),
}

impl ConvenientAttrPath {
    pub fn clone_from_dotted(s: &str) -> Self {
        Self::Dotted(Box::from(s))
    }

    pub fn clone_from_split(s: &[&str]) -> Self {
        Self::from_str_iter(s.iter().map(Deref::deref))
    }

    pub fn from_str_iter<'i, I>(iter: I) -> Self
    where
        I: IntoIterator<Item = &'i str>,
    {
        let iter = iter.into_iter();
        let boxed = iter.map(Box::from);
        Self::Split(Box::from_iter(boxed))
    }

    pub fn to_nix_decl(&self) -> Box<str> {
        use ConvenientAttrPath::*;
        match self {
            Dotted(s) => s.clone(),
            Split(path) => {
                // FIXME: quote if necessary
                path.join(".").into_boxed_str()
            },
        }
    }
}

#[derive(Debug, Clone, PartialEq)]
#[derive(serde::Deserialize, serde::Serialize)]
#[serde(tag = "action", content = "args", rename_all = "snake_case")]
// FIXME: rename to not confuse with the clap argument type.
pub enum DaemonCmd {
    Append {
        name: ConvenientAttrPath,
        value: Box<str>,
    },
}