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use crate::{Error, ErrorKind};
use serde::{de::Error as _, Deserialize, Deserializer, Serialize, Serializer};
use std::{
    fmt::{self, Display},
    str::FromStr,
};
use subtle_encoding::hex;

/// ABCI transaction data.
///
/// Transactions are opaque binary blobs which are validated according to
/// application-specific rules.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Data(Vec<u8>);

impl Data {
    /// Borrow the data as bytes
    pub fn as_bytes(&self) -> &[u8] {
        self.0.as_ref()
    }
}

impl AsRef<[u8]> for Data {
    fn as_ref(&self) -> &[u8] {
        self.0.as_ref()
    }
}

impl Display for Data {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        for byte in &self.0 {
            write!(f, "{:02X}", byte)?;
        }
        Ok(())
    }
}

impl FromStr for Data {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        // Accept either upper or lower case hex
        let bytes = hex::decode_upper(s)
            .or_else(|_| hex::decode(s))
            .map_err(|_| ErrorKind::Parse)?;

        Ok(Data(bytes))
    }
}

impl<'de> Deserialize<'de> for Data {
    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
        let bytes = hex::decode(String::deserialize(deserializer)?.as_bytes())
            .map_err(|e| D::Error::custom(format!("{}", e)))?;

        Ok(Self(bytes))
    }
}

impl Serialize for Data {
    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        self.to_string().serialize(serializer)
    }
}