use core::fmt;

pub struct ProofVerifyError;

impl fmt::Display for ProofVerifyError {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    write!(f, "Proof verification failed")
  }
}

impl fmt::Debug for ProofVerifyError {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    write!(f, "{{ file: {}, line: {} }}", file!(), line!())
  }
}

#[derive(Clone, Debug, Eq, PartialEq)]
pub enum R1CSError {
  /// returned if the number of constraints is not a power of 2
  NonPowerOfTwoCons,
  /// returned if the number of variables is not a power of 2
  NonPowerOfTwoVars,
  /// returned if a wrong number of inputs in an assignment are supplied
  InvalidNumberOfInputs,
  /// returned if a wrong number of variables in an assignment are supplied
  InvalidNumberOfVars,
  /// returned if a [u8;32] does not parse into a valid Scalar in the field of ristretto255
  InvalidScalar,
  /// returned if the supplied row or col in (row,col,val) tuple is out of range
  InvalidIndex,
}