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use serde_derive::{Deserialize, Serialize};
use std::fmt::{self, Display};

/// Result returning Error
pub type Result<T> = std::result::Result<T, Error>;

/// All except Internal are considered user-facing.
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub enum Error {
    /// TODO: Document
    Abort,

    /// TODO: Document
    Config(String),

    /// TODO: Document
    Internal(String),

    /// TODO: Document
    Parse(String),

    /// TODO: Document
    ReadOnly,

    /// TODO: Document
    Serialization,

    /// TODO: Document
    Value(String),
}

impl std::error::Error for Error {}

impl Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> fmt::Result {
        match self {
            Error::Config(s) | Error::Internal(s) | Error::Parse(s) | Error::Value(s) => {
                write!(f, "{}", s)
            }
            Error::Abort => write!(f, "Operation aborted"),
            Error::Serialization => write!(f, "Serialization failure, retry transaction"),
            Error::ReadOnly => write!(f, "Read-only transaction"),
        }
    }
}

impl From<std::array::TryFromSliceError> for Error {
    fn from(err: std::array::TryFromSliceError) -> Self {
        Error::Internal(err.to_string())
    }
}

impl From<std::io::Error> for Error {
    fn from(err: std::io::Error) -> Self {
        Error::Internal(err.to_string())
    }
}

impl From<std::net::AddrParseError> for Error {
    fn from(err: std::net::AddrParseError) -> Self {
        Error::Internal(err.to_string())
    }
}

impl From<std::num::ParseFloatError> for Error {
    fn from(err: std::num::ParseFloatError) -> Self {
        Error::Parse(err.to_string())
    }
}

impl From<std::num::ParseIntError> for Error {
    fn from(err: std::num::ParseIntError) -> Self {
        Error::Parse(err.to_string())
    }
}

impl From<std::string::FromUtf8Error> for Error {
    fn from(err: std::string::FromUtf8Error) -> Self {
        Error::Internal(err.to_string())
    }
}

impl<T> From<std::sync::PoisonError<T>> for Error {
    fn from(err: std::sync::PoisonError<T>) -> Self {
        Error::Internal(err.to_string())
    }
}