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use std::cmp::{PartialEq, PartialOrd};
use std::ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo, RangeToInclusive};
use std::str;

/// Set relationship.
pub trait Set<T> {
  /// Whether a set contains an element or not.
  fn contains(&self, elem: &T) -> bool;

  /// Convert to text for display.
  fn to_str(&self) -> &str {
    "<set>"
  }
}

impl<T: PartialEq> Set<T> for [T] {
  fn contains(&self, elem: &T) -> bool {
    (self as &[T]).contains(elem)
  }
}

impl Set<char> for str {
  fn contains(&self, elem: &char) -> bool {
    (self as &str).contains(*elem)
  }

  fn to_str(&self) -> &str {
    self
  }
}

// ..
impl<T> Set<T> for RangeFull {
  fn contains(&self, _: &T) -> bool {
    true
  }

  fn to_str(&self) -> &str {
    ".."
  }
}

//  start..end
impl<T: PartialOrd + Copy> Set<T> for Range<T> {
  fn contains(&self, elem: &T) -> bool {
    self.start <= *elem && self.end > *elem
  }
}

// start..=end
impl<T: PartialOrd + Copy> Set<T> for RangeInclusive<T> {
  fn contains(&self, elem: &T) -> bool {
    self.start() <= elem && self.end() >= elem
  }
}

// start..
impl<T: PartialOrd + Copy> Set<T> for RangeFrom<T> {
  fn contains(&self, elem: &T) -> bool {
    self.start <= *elem
  }
}

// ..end
impl<T: PartialOrd + Copy> Set<T> for RangeTo<T> {
  fn contains(&self, elem: &T) -> bool {
    self.end > *elem
  }
}

// ..=end
impl<T: PartialOrd + Copy> Set<T> for RangeToInclusive<T> {
  fn contains(&self, elem: &T) -> bool {
    self.end >= *elem
  }
}

macro_rules! impl_set_for_array {
	( $($n:expr),+ ) => {
		$(
			impl Set<u8> for [u8; $n] {
				fn contains(&self, elem: &u8) -> bool {
					(self as &[u8]).contains(elem)
				}

				fn to_str(&self) -> &str {
					str::from_utf8(self).unwrap_or("<byte array>")
				}
			}
		)+
	};
}

impl_set_for_array!(
  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60,
  61, 62, 63, 64
);