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//! Errors for Zcash consensus-critical serialization.

use std::{array::TryFromSliceError, io, num::TryFromIntError, str::Utf8Error};

use hex::FromHexError;
use thiserror::Error;

/// A serialization error.
// TODO: refine error types -- better to use boxed errors?
#[derive(Error, Debug)]
pub enum SerializationError {
    /// An io error that prevented deserialization
    #[error("io error: {0}")]
    Io(#[from] io::Error),

    /// The data to be deserialized was malformed.
    // TODO: refine errors
    #[error("parse error: {0}")]
    Parse(&'static str),

    /// A string was not UTF-8.
    ///
    /// Note: Rust `String` and `str` are always UTF-8.
    #[error("string was not UTF-8: {0}")]
    Utf8Error(#[from] Utf8Error),

    /// A slice was an unexpected length during deserialization.
    #[error("slice was the wrong length: {0}")]
    TryFromSliceError(#[from] TryFromSliceError),

    /// The length of a vec is too large to convert to a usize (and thus, too large to allocate on this platform)
    #[error("CompactSize too large: {0}")]
    TryFromIntError(#[from] TryFromIntError),

    /// A string was not valid hexadecimal.
    #[error("string was not hex: {0}")]
    FromHexError(#[from] FromHexError),

    /// An error caused when validating a zatoshi `Amount`
    #[error("input couldn't be parsed as a zatoshi `Amount`: {source}")]
    Amount {
        /// The source error indicating how the num failed to validate
        #[from]
        source: crate::amount::Error,
    },

    /// Invalid transaction with a non-zero balance and no Sapling shielded spends or outputs.
    ///
    /// Transaction does not conform to the Sapling [consensus
    /// rule](https://zips.z.cash/protocol/protocol.pdf#txnencodingandconsensus).
    #[error("transaction balance is non-zero but doesn't have Sapling shielded spends or outputs")]
    BadTransactionBalance,
}