use core::fmt::Debug;
use thiserror::Error;

#[derive(Error, Debug)]
pub enum ProofVerifyError {
  #[error("Proof verification failed")]
  InternalError,
  #[error("Compressed group element failed to decompress: {0:?}")]
  DecompressionError(Vec<u8>),
}

impl Default for ProofVerifyError {
  fn default() -> Self {
    ProofVerifyError::InternalError
  }
}

#[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,
}