use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
/// The id of the window.
///
/// Internally Iced reserves `window::Id::MAIN` for the first window spawned.
pub struct Id(u64);

impl Id {
    /// The reserved window [`Id`] for the first window in an Iced application.
    pub const MAIN: Self = Id(0);

    /// Creates a new unique window [`Id`].
    pub fn new(id: impl Hash) -> Id {
        let mut hasher = DefaultHasher::new();
        id.hash(&mut hasher);

        Id(hasher.finish())
    }
}