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use core::hash::Hash;
use core::hash::Hasher;
use core::mem;

// This provides Eq for f64.
#[derive(Clone, Debug)]
pub struct JsNumber(pub f64);

impl PartialEq for JsNumber {
  fn eq(&self, other: &Self) -> bool {
    if self.0.is_nan() {
      return other.0.is_nan();
    };
    self.0.eq(&other.0)
  }
}

impl Eq for JsNumber {}

impl Hash for JsNumber {
  fn hash<H: Hasher>(&self, state: &mut H) {
    if !self.0.is_nan() {
      unsafe { mem::transmute::<f64, u64>(self.0) }.hash(state);
    };
  }
}

#[cfg(feature = "serialize")]
impl serde::Serialize for JsNumber {
  fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
    serializer.serialize_f64(self.0)
  }
}