use super::RmpWrite;

use crate::encode::{write_marker, ValueWriteError};

use crate::Marker;

/// Encodes and attempts to write the most efficient binary array length implementation to the given

/// write, returning the marker used.

///

/// This function is useful when you want to get full control for writing the data itself, for

/// example, when using non-blocking socket.

///

/// # Errors

///

/// This function will return `ValueWriteError` on any I/O error occurred while writing either the

/// marker or the data.

pub fn write_bin_len<W: RmpWrite>(wr: &mut W, len: u32) -> Result<Marker, ValueWriteError<W::Error>> {

    let marker = if len < 256 {

        Marker::Bin8

    } else if len <= u16::MAX as u32 {

        Marker::Bin16

    } else {

        Marker::Bin32

    };

    write_marker(&mut *wr, marker)?;

    if marker == Marker::Bin8 {

        wr.write_data_u8(len as u8)?;

    } else if marker == Marker::Bin16 {

        wr.write_data_u16(len as u16)?;

    } else if marker == Marker::Bin32 {

        wr.write_data_u32(len)?;

    }

    Ok(marker)

}

/// Encodes and attempts to write the most efficient binary implementation to the given `Write`.

///

/// # Errors

///

/// This function will return `ValueWriteError` on any I/O error occurred while writing either the

/// marker or the data.

// TODO: Docs, range check, example, visibility.

pub fn write_bin<W: RmpWrite>(wr: &mut W, data: &[u8]) -> Result<(), ValueWriteError<W::Error>> {

    write_bin_len(wr, data.len() as u32)?;

    wr.write_bytes(data)

        .map_err(ValueWriteError::InvalidDataWrite)

}