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//! [BSON Decimal128](https://github.com/mongodb/specifications/blob/master/source/bson-decimal128/decimal128.rst) data type representation

use std::{convert::TryInto, fmt};

/// Struct representing a BSON Decimal128 type.
///
/// Currently, this type can only be used to round-trip through BSON. See
/// [RUST-36](https://jira.mongodb.org/browse/RUST-36) to track the progress towards a complete implementation.
#[derive(Copy, Clone, PartialEq)]
pub struct Decimal128 {
    /// BSON bytes containing the decimal128. Stored for round tripping.
    pub(crate) bytes: [u8; 128 / 8],
}

impl Decimal128 {
    /// Constructs a new `Decimal128` from the provided raw byte representation.
    pub fn from_bytes(bytes: [u8; 128 / 8]) -> Self {
        Self { bytes }
    }

    /// Returns the raw byte representation of this `Decimal128`.
    pub fn bytes(&self) -> [u8; 128 / 8] {
        self.bytes
    }

    pub(crate) fn deserialize_from_slice<E: serde::de::Error>(
        bytes: &[u8],
    ) -> std::result::Result<Self, E> {
        let arr: [u8; 128 / 8] = bytes.try_into().map_err(E::custom)?;
        Ok(Decimal128 { bytes: arr })
    }
}

impl fmt::Debug for Decimal128 {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Decimal128(...)")
    }
}

impl fmt::Display for Decimal128 {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}