echonet-lite 0.1.6

use crate::error::{Error, ErrorKind};
use crate::io::{self, Write};
use crate::lib::vec::Vec;
use write::WriteBytesExt;

mod write;

struct Writer(Vec<u8>);
impl Write for Writer {
    #[inline]
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        self.0.extend_from_slice(buf);
        Ok(buf.len())
    }

    #[inline]
    fn flush(&mut self) -> io::Result<()> {
        Ok(())
    }
}

pub fn serialize<T: ?Sized>(value: &T) -> Result<Vec<u8>, Error>
where
    T: serde::Serialize,
{
    let mut writer = Writer(Vec::new());
    let mut serializer = Serializer::new(&mut writer);
    serde::Serialize::serialize(value, &mut serializer)?;
    Ok(writer.0)
}

pub(crate) struct Serializer<W> {
    writer: W,
}

impl<W: Write> Serializer<W> {
    pub fn new(writer: W) -> Serializer<W> {
        Serializer { writer }
    }
}

impl<'a, W: Write> serde::Serializer for &'a mut Serializer<W> {
    type Ok = ();
    type Error = Error;
    type SerializeSeq = Compound<'a, W>;
    type SerializeTuple = Compound<'a, W>;
    type SerializeTupleStruct = Compound<'a, W>;
    type SerializeTupleVariant = Compound<'a, W>;
    type SerializeMap = Compound<'a, W>;
    type SerializeStruct = Compound<'a, W>;
    type SerializeStructVariant = Compound<'a, W>;

    fn serialize_unit(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_bool(self, v: bool) -> Result<Self::Ok, Self::Error> {
        self.writer.write_u8(u8::from(v)).map_err(Into::into)
    }

    fn serialize_i8(self, v: i8) -> Result<Self::Ok, Self::Error> {
        self.writer.write_i8(v).map_err(Into::into)
    }

    fn serialize_i16(self, v: i16) -> Result<Self::Ok, Self::Error> {
        self.writer.write_i16(v).map_err(Into::into)
    }

    fn serialize_i32(self, v: i32) -> Result<Self::Ok, Self::Error> {
        self.writer.write_i32(v).map_err(Into::into)
    }

    fn serialize_i64(self, _v: i64) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_u8(self, v: u8) -> Result<Self::Ok, Self::Error> {
        self.writer.write_u8(v).map_err(Into::into)
    }

    fn serialize_u16(self, v: u16) -> Result<Self::Ok, Self::Error> {
        self.writer.write_u16(v).map_err(Into::into)
    }

    fn serialize_u32(self, v: u32) -> Result<Self::Ok, Self::Error> {
        self.writer.write_u32(v).map_err(Into::into)
    }

    fn serialize_u64(self, _v: u64) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_f32(self, _v: f32) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_f64(self, _v: f64) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_char(self, _v: char) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_str(self, _v: &str) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error> {
        self.serialize_u8(v.len() as u8)?;
        self.writer.write_all(v).map_err(Into::into)
    }

    fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_some<T: ?Sized>(self, _value: &T) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        todo!()
    }

    fn serialize_unit_struct(self, _: &'static str) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }

    fn serialize_unit_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
    ) -> Result<Self::Ok, Self::Error> {
        todo!()
    }

    fn serialize_newtype_struct<T: ?Sized>(
        self,
        _name: &'static str,
        value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        value.serialize(self)
    }

    fn serialize_newtype_variant<T: ?Sized>(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: serde::Serialize,
    {
        todo!()
    }

    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, Self::Error> {
        let len = len.ok_or(ErrorKind::SequenceMustHaveLength)?;
        self.serialize_u8(len as u8)?;
        Ok(Compound { ser: self })
    }

    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple, Self::Error> {
        Ok(Compound { ser: self })
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleStruct, Self::Error> {
        Ok(Compound { ser: self })
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleVariant, Self::Error> {
        todo!()
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap, Self::Error> {
        todo!()
    }

    fn serialize_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStruct, Self::Error> {
        Ok(Compound { ser: self })
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeStructVariant, Self::Error> {
        todo!()
    }
}

pub(crate) struct Compound<'a, W: 'a> {
    ser: &'a mut Serializer<W>,
}

impl<'a, W> serde::ser::SerializeSeq for Compound<'a, W>
where
    W: Write,
{
    type Ok = ();
    type Error = Error;

    #[inline]
    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<Self::Ok, Self::Error>
    where
        T: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl<'a, W> serde::ser::SerializeTuple for Compound<'a, W>
where
    W: Write,
{
    type Ok = ();
    type Error = Error;

    #[inline]
    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<Self::Ok, Self::Error>
    where
        T: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl<'a, W> serde::ser::SerializeTupleStruct for Compound<'a, W>
where
    W: Write,
{
    type Ok = ();
    type Error = Error;

    #[inline]
    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<Self::Ok, Self::Error>
    where
        T: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl<'a, W> serde::ser::SerializeTupleVariant for Compound<'a, W>
where
    W: Write,
{
    type Ok = ();
    type Error = Error;

    #[inline]
    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<Self::Ok, Self::Error>
    where
        T: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl<'a, W> serde::ser::SerializeMap for Compound<'a, W>
where
    W: Write,
{
    type Ok = ();
    type Error = Error;

    #[inline]
    fn serialize_key<K: ?Sized>(&mut self, value: &K) -> Result<Self::Ok, Self::Error>
    where
        K: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn serialize_value<V: ?Sized>(&mut self, value: &V) -> Result<Self::Ok, Self::Error>
    where
        V: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl<'a, W> serde::ser::SerializeStruct for Compound<'a, W>
where
    W: Write,
{
    type Ok = ();
    type Error = Error;

    #[inline]
    fn serialize_field<T: ?Sized>(
        &mut self,
        _key: &'static str,
        value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}

impl<'a, W> serde::ser::SerializeStructVariant for Compound<'a, W>
where
    W: Write,
{
    type Ok = ();
    type Error = Error;

    #[inline]
    fn serialize_field<T: ?Sized>(
        &mut self,
        _key: &'static str,
        value: &T,
    ) -> Result<Self::Ok, Self::Error>
    where
        T: serde::ser::Serialize,
    {
        value.serialize(&mut *self.ser)
    }

    #[inline]
    fn end(self) -> Result<Self::Ok, Self::Error> {
        Ok(())
    }
}