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use std::cmp::Ordering;

use ::rr::{Name, RecordType};

/// Accessor key for RRSets in the Authority.
#[derive(Eq, PartialEq, Debug, Hash, Clone)]
pub struct RrKey { pub name: Name, pub record_type: RecordType }

impl RrKey {
  /// Creates a new key to access the Authority.
  ///
  /// # Arguments
  ///
  /// * `name` - domain name to lookup.
  /// * `record_type` - the `RecordType` to lookup.
  ///
  /// # Return value
  ///
  /// A new key to access the Authorities.
  /// TODO: make all cloned params pass by value.
  pub fn new(name: &Name, record_type: RecordType) -> RrKey {
    RrKey{ name: name.clone(), record_type: record_type }
  }
}

impl PartialOrd for RrKey {
  fn partial_cmp(&self, other: &RrKey) -> Option<Ordering> {
    Some(self.cmp(other))
  }
}

impl Ord for RrKey {
  fn cmp(&self, other: &Self) -> Ordering {
    let order = self.name.cmp(&other.name);
    if order == Ordering::Equal {
      self.record_type.cmp(&other.record_type)
    } else {
      order
    }
  }
}