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//

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//

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use crate::message::{Error, FromBytes, Message, WriteTo};

use crate::util::ToUsize;

use std::io::Write;

use std::marker::PhantomData;

pub struct NullTerminatedString;

impl<'a> FromBytes<'a> for NullTerminatedString {

    type Output = &'a str;

    fn from_bytes(slice: &'a [u8]) -> Result<Message<Self::Output>, Error> {

        let string = slice

            .iter()

            .enumerate()

            .find_map(|(id, v)| match *v == 0x0 {

                true => Some(id),

                false => None,

            })

            .map(|pos| std::str::from_utf8(&slice[0..pos]))

            .ok_or(Error::Truncated)
?0

            .map_err(|_| 
Error::InvalidUtf80
)
?0
;

        Ok(Message::new(string.len() + 1, string))

    }

}

impl WriteTo for NullTerminatedString {

    type Input<'a> = &'a str;

    fn write_to<W: Write>(input: &Self::Input<'_>, mut out: W) -> Result<(), Error> {

        out.write_all(input.as_bytes())
?0
;

        out.write_all(&[0x0])
?0
;

        Ok(())

    }

}

#[cfg(feature = "tokio")]

impl crate::message::WriteToAsync for NullTerminatedString {

    async fn write_to_async<W: tokio::io::AsyncWriteExt + Unpin>(

        input: &Self::Input<'_>,

        mut out: W,

    ) -> crate::message::Result<()> {

        out.write_all(input.as_bytes()).await
?0
;

        out.write_all(&[0x0]).await
?0
;

        Ok(())

    }

}

pub struct VarcharString<T>(PhantomData<T>);

impl<'a, T: FromBytes<'a, Output: ToUsize>> FromBytes<'a> for VarcharString<T> {

    type Output = &'a str;

    fn from_bytes(slice: &'a [u8]) -> Result<Message<Self::Output>, Error> {

        let msg = T::from_bytes(slice)
?0
;

        let size = msg.size();

        let subslice = &slice[size..size + msg.into_inner().to_usize()];

        let string = std::str::from_utf8(subslice).map_err(|_| 
Error::InvalidUtf80
)
?0
;

        Ok(Message::new(size + string.len(), string))

    }

}

impl<T: WriteTo<Input<'static>: ToUsize>> WriteTo for VarcharString<T> {

    type Input<'a> = &'a str;

    fn write_to<W: Write>(input: &Self::Input<'_>, mut out: W) -> Result<(), Error> {

        T::write_to(&T::Input::from_usize(input.len()), &mut out)
?0
;

        out.write_all(input.as_bytes())
?0
;

        Ok(())

    }

}

#[cfg(feature = "tokio")]

impl<T: crate::message::WriteToAsync<Input<'static>: ToUsize>> crate::message::WriteToAsync for VarcharString<T> {

    async fn write_to_async<W: tokio::io::AsyncWriteExt + Unpin>(

        input: &Self::Input<'_>,

        mut out: W,

    ) -> crate::message::Result<()> {

        T::write_to_async(&T::Input::from_usize(input.len()), &mut out).await?;

        out.write_all(input.as_bytes()).await?;

        Ok(())

    }

}