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use byteorder::{ReadBytesExt, WriteBytesExt};
use std::io::{Read, Write};
use std::{fmt, io};
use {Endian, PreliminaryTryFrom, WithFixedPayloadLength};

#[repr(u16)]
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum ErrorCode {
    Success = 0x0000,
    Failure = 0x0001,
    MessageConstructionError = 0x0002,
    InvalidOptions = 0x0003,
    OutOfSequence = 0x0011,
    PayloadTooBig = 0x0012,
    UnknownMessage = 0x0020,
    InvalidLength = 0x0021,
    NonExistingIndex = 0x0100,
    InvalidCount = 0x0101,
    UnsupportedType = 0x0102,
    UnsupportedValue = 0x0103,
    TypeValueMismatch = 0x0104,
    InvalidOperation = 0x0105,
    ExhaustedResources = 0x0106,
    InvalidState = 0x0107,
    InsufficientPermission = 0x0108,
    ProgrammingMistake = 0x0109,
}

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

impl fmt::LowerHex for ErrorCode {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:x}", *self as u16)
    }
}

impl ErrorCode {
    pub fn is_success(&self) -> bool {
        *self == ErrorCode::Success
    }

    pub fn is_error(&self) -> bool {
        !self.is_success()
    }

    pub fn success_or_else<F, O>(self, op: O) -> Result<(), F>
    where
        O: FnOnce(ErrorCode) -> F,
    {
        if self.is_error() {
            Err(op(self))
        } else {
            Ok(())
        }
    }
}

impl WithFixedPayloadLength for ErrorCode {
    const FIXED_PAYLOAD_LENGTH: u16 = u16::FIXED_PAYLOAD_LENGTH;
}

impl PreliminaryTryFrom<u16> for ErrorCode {
    type Error = io::Error;
    fn try_from(value: u16) -> io::Result<Self> {
        match value {
            0x0000 => Ok(ErrorCode::Success),
            0x0001 => Ok(ErrorCode::Failure),
            0x0002 => Ok(ErrorCode::MessageConstructionError),
            0x0003 => Ok(ErrorCode::InvalidOptions),
            0x0011 => Ok(ErrorCode::OutOfSequence),
            0x0012 => Ok(ErrorCode::PayloadTooBig),
            0x0020 => Ok(ErrorCode::UnknownMessage),
            0x0021 => Ok(ErrorCode::InvalidLength),
            0x0100 => Ok(ErrorCode::NonExistingIndex),
            0x0101 => Ok(ErrorCode::InvalidCount),
            0x0102 => Ok(ErrorCode::UnsupportedType),
            0x0103 => Ok(ErrorCode::UnsupportedValue),
            0x0104 => Ok(ErrorCode::TypeValueMismatch),
            0x0105 => Ok(ErrorCode::InvalidOperation),
            0x0106 => Ok(ErrorCode::ExhaustedResources),
            0x0107 => Ok(ErrorCode::InvalidState),
            0x0108 => Ok(ErrorCode::InsufficientPermission),
            0x0109 => Ok(ErrorCode::ProgrammingMistake),
            _ => Err(io::Error::new(
                io::ErrorKind::InvalidData,
                format!("Invalid ErrorCode enum value {}", value),
            )),
        }
    }
}

pub(crate) trait ErrorCodeWriterExt: Write {
    fn write_error_code(
        &mut self,
        error_code: &ErrorCode,
    ) -> io::Result<()> {
        self.write_u16::<Endian>(*error_code as u16)?;
        Ok(())
    }
}

impl<B: Write + ?Sized> ErrorCodeWriterExt for B {}

pub(crate) trait ErrorCodeReaderExt: Read {
    fn read_error_code(&mut self) -> io::Result<ErrorCode> {
        let value = self.read_u16::<Endian>()?;
        ErrorCode::try_from(value)
    }
}

impl<B: Read + ?Sized> ErrorCodeReaderExt for B {}

impl<E> Into<::std::result::Result<(), E>> for ErrorCode
where
    E: From<ErrorCode>,
{
    fn into(self) -> ::std::result::Result<(), E> {
        match self {
            ErrorCode::Success => Ok(()),
            _ => Err(E::from(self)),
        }
    }
}

pub trait HasErrorCode {
    fn error_code(&self) -> ErrorCode;
}

impl<'a, T: HasErrorCode> HasErrorCode for &'a T {
    fn error_code(&self) -> ErrorCode {
        (**self).error_code()
    }
}