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#![allow(unused_variables)]

use core::fmt::{Display, Formatter};

#[derive(Debug)]
pub enum Error {
    WontImplement,
    NotYetImplemented,
    SerializeBufferFull,
    SerializeSeqLengthUnknown,
    DeserializeUnexpectedEnd,
    DeserializeBadVarint,
    DeserializeBadBool,
    DeserializeBadChar,
    DeserializeBadUtf8,
    DeserializeBadOption,
    DeserializeBadEnum,
    SerdeSerCustom,
    SerdeDeCustom,
}

impl Display for Error {
    fn fmt(&self, f: &mut Formatter) -> core::fmt::Result {
        use Error::*;
        write!(f, "{}", match self {
            WontImplement => "This is a feature that PostCard will never implement",
            NotYetImplemented => "This is a feature that Postcard intends to support, but does not yet",
            SerializeBufferFull => "The serialize buffer is full",
            SerializeSeqLengthUnknown => "The length of a sequence must be known",
            DeserializeUnexpectedEnd => "Hit the end of buffer, expected more data",
            DeserializeBadVarint => "Found a varint that didn't terminate. Is the usize too big for this platform?",
            DeserializeBadBool => "Found a bool that wasn't 0 or 1",
            DeserializeBadChar => "Found an invalid unicode char",
            DeserializeBadUtf8 => "Tried to parse invalid utf-8",
            DeserializeBadOption => "Found an Option discriminant that wasn't 0 or 1",
            DeserializeBadEnum => "Found an enum discriminant that was > u32::max_value()",
            SerdeSerCustom => "Serde Serialization Error",
            SerdeDeCustom => "Serde Deserialization Error",
        })
    }
}

pub type Result<T> = ::core::result::Result<T, Error>;

impl serde::ser::Error for Error {
    fn custom<T>(_msg: T) -> Self
    where
        T: Display,
    {
        Error::SerdeSerCustom
    }
}

impl serde::de::Error for Error {
    fn custom<T>(_msg: T) -> Self
    where
        T: Display,
    {
        Error::SerdeDeCustom
    }
}