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use std::convert::From;
use std::error::Error as StdError;
use std::fmt;
use std::io;
use std::num::{ParseFloatError, ParseIntError};
use std::result::Result as StdResult;

pub type Result<T> = StdResult<T, Error>;

#[derive(Debug)]
pub enum Error {
    UnknownPlatform,
    Key(&'static str),
    Task(String),
    Codec(String),
    ParseInt(ParseIntError),
    ParseFloat(ParseFloatError),
    Io(io::Error),
}

impl Error {
    /// Create Codec error from input data.
    ///
    /// ## Example
    /// ```rust
    /// use open_protocol::Error;
    ///
    /// let _ = Error::codec("fail to deserialize data");
    /// ```
    pub fn codec<I: Into<String>>(m: I) -> Error {
        Error::Codec(m.into())
    }
}

impl From<ParseIntError> for Error {
    fn from(err: ParseIntError) -> Self {
        Error::ParseInt(err)
    }
}

impl From<ParseFloatError> for Error {
    fn from(err: ParseFloatError) -> Self {
        Error::ParseFloat(err)
    }
}

impl From<io::Error> for Error {
    fn from(err: io::Error) -> Self {
        Error::Io(err)
    }
}

impl StdError for Error {
    fn description(&self) -> &str {
        match *self {
            Error::UnknownPlatform => "Unknown platform",
            Error::Task(ref s) => s,
            Error::Key(s) => s,
            Error::Codec(ref s) => s,
            Error::ParseInt(ref e) => e.description(),
            Error::ParseFloat(ref e) => e.description(),
            Error::Io(ref e) => e.description(),
        }
    }
}

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