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

#[repr(u16)]
#[derive(Clone, Debug, PartialEq)]
pub enum DeviceCapability {
    ParametersLimit = 0,
    JobLimit = 1,
    InstructionChunkLimit = 2,
}

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

impl PreliminaryTryFrom<u16> for DeviceCapability {
    type Error = io::Error;
    fn try_from(value: u16) -> io::Result<Self> {
        match value {
            0 => Ok(DeviceCapability::ParametersLimit),
            1 => Ok(DeviceCapability::JobLimit),
            2 => Ok(DeviceCapability::InstructionChunkLimit),
            _ => Err(io::Error::new(
                io::ErrorKind::InvalidData,
                format!("Invalid DeviceCapability enum value {}", value),
            )),
        }
    }
}

pub(crate) trait DeviceCapabilityWriterExt: Write {
    fn write_device_capability(
        &mut self,
        device_capability: &DeviceCapability,
    ) -> io::Result<()> {
        self.write_u16::<Endian>(device_capability.clone() as u16)?;
        Ok(())
    }
}

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

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

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