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use crate::*;
use serde::{Deserialize, Serialize};
use std::sync::atomic::{AtomicUsize, Ordering};

#[derive(Eq, PartialEq, Copy, Clone, Hash, PartialOrd, Ord, Serialize, Deserialize)]
pub struct Id(usize);

static NODE_GEN: AtomicUsize = AtomicUsize::new(0xffff);

impl Id {
    pub fn new() -> Id {
        Id(NODE_GEN.fetch_add(1, Ordering::SeqCst))
    }

    pub const NULL: Id = Id(0);

    pub fn is_null(&self) -> bool {
        *self == Self::NULL
    }

    pub fn as_usize(&self) -> usize {
        self.0
    }
}

impl fmt::Display for Id {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let Id(value) = self;
        write!(f, "#{:X}", value)
    }
}

impl fmt::Debug for Id {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let Id(value) = self;
        write!(f, "#{:X}", value)
    }
}

impl From<usize> for Id {
    fn from(n: usize) -> Self {
        Id(n)
    }
}

impl Into<usize> for Id {
    fn into(self) -> usize {
        self.0
    }
}