serde_xmlrpc 0.3.0-alpha.2

use base64::prelude::*;
use quick_xml::{
    events::{BytesStart, Event},
    Writer,
};

use crate::error::EncodingError;
use crate::xml_ext::WriterExt;
use crate::{Error, Result};

pub(crate) struct Serializer<'a, W>
where
    W: std::io::Write,
{
    writer: &'a mut Writer<W>,
}

impl<'a, W> Serializer<'a, W>
where
    W: std::io::Write,
{
    pub(crate) fn new(writer: &'a mut Writer<W>) -> Self {
        Serializer { writer }
    }
}

impl<'a, W> serde::Serializer for Serializer<'a, W>
where
    W: std::io::Write,
{
    type Ok = ();
    type Error = Error;

    type SerializeSeq = Self;
    type SerializeTuple = Self;
    type SerializeTupleStruct = Self;
    type SerializeTupleVariant = Self;
    type SerializeMap = Self;
    type SerializeStruct = Self;
    type SerializeStructVariant = Self;

    fn serialize_bool(self, v: bool) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer
            .write_safe_tag("boolean", if v { "1" } else { "0" })?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_i8(self, v: i8) -> Result<Self::Ok> {
        self.serialize_i64(v as i64)
    }

    fn serialize_i16(self, v: i16) -> Result<Self::Ok> {
        self.serialize_i64(v as i64)
    }

    fn serialize_i32(self, v: i32) -> Result<Self::Ok> {
        self.serialize_i64(v as i64)
    }

    fn serialize_i64(self, v: i64) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer.write_safe_tag("int", &v.to_string())?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_u8(self, v: u8) -> Result<Self::Ok> {
        self.serialize_u64(v as u64)
    }

    fn serialize_u16(self, v: u16) -> Result<Self::Ok> {
        self.serialize_u64(v as u64)
    }

    fn serialize_u32(self, v: u32) -> Result<Self::Ok> {
        self.serialize_u64(v as u64)
    }

    fn serialize_u64(self, v: u64) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer.write_safe_tag("int", &v.to_string())?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_f32(self, v: f32) -> Result<Self::Ok> {
        self.serialize_f64(v as f64)
    }

    fn serialize_f64(self, v: f64) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer.write_safe_tag("double", &v.to_string())?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_char(self, v: char) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer.write_tag("string", &v.to_string())?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_str(self, v: &str) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer.write_tag("string", v)?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer
            .write_safe_tag("base64", &BASE64_STANDARD.encode(v))?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_none(self) -> Result<Self::Ok> {
        self.serialize_unit()
    }

    fn serialize_some<T>(self, v: &T) -> Result<Self::Ok>
    where
        T: ?Sized + serde::Serialize,
    {
        v.serialize(self)
    }

    fn serialize_unit(self) -> Result<Self::Ok> {
        self.writer.write_start_tag("value")?;
        self.writer
            .write_event(Event::Empty(BytesStart::new("nil")))
            .map_err(EncodingError::from)?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }

    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok> {
        self.serialize_unit()
    }

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

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

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

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
        self.writer.write_start_tag("value")?;
        self.writer.write_start_tag("array")?;
        self.writer.write_start_tag("data")?;
        Ok(self)
    }

    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleStruct> {
        self.serialize_seq(Some(len))
    }

    fn serialize_tuple_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        len: usize,
    ) -> Result<Self::SerializeTupleVariant> {
        self.serialize_seq(Some(len))
    }

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
        self.writer.write_start_tag("value")?;
        self.writer.write_start_tag("struct")?;
        Ok(self)
    }

    fn serialize_struct(self, _name: &'static str, len: usize) -> Result<Self::SerializeStruct> {
        self.serialize_map(Some(len))
    }

    fn serialize_struct_variant(
        self,
        _name: &'static str,
        _variant_index: u32,
        _variant: &'static str,
        len: usize,
    ) -> Result<Self::SerializeStructVariant> {
        self.serialize_map(Some(len))
    }
}

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

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        value.serialize(Serializer::new(self.writer))
    }

    fn end(self) -> Result<Self::Ok> {
        self.writer.write_end_tag("data")?;
        self.writer.write_end_tag("array")?;
        self.writer.write_end_tag("value")?;

        Ok(())
    }
}

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

    fn serialize_element<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Self::Ok> {
        serde::ser::SerializeSeq::end(self)
    }
}

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

    fn serialize_field<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Self::Ok> {
        serde::ser::SerializeSeq::end(self)
    }
}

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

    fn serialize_field<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        serde::ser::SerializeSeq::serialize_element(self, value)
    }

    fn end(self) -> Result<Self::Ok> {
        serde::ser::SerializeSeq::end(self)
    }
}

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

    fn serialize_key<T>(&mut self, key: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        self.writer.write_start_tag("member")?;
        key.serialize(MapKeySerializer::new(self.writer))?;
        Ok(())
    }

    fn serialize_value<T>(&mut self, value: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        value.serialize(Serializer::new(self.writer))?;
        self.writer.write_end_tag("member")?;
        Ok(())
    }

    fn end(self) -> Result<Self::Ok> {
        self.writer.write_end_tag("struct")?;
        self.writer.write_end_tag("value")?;
        Ok(())
    }
}

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

    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        serde::ser::SerializeMap::serialize_entry(self, key, value)
    }

    fn end(self) -> Result<Self::Ok> {
        serde::ser::SerializeMap::end(self)
    }
}

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

    fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
    where
        T: ?Sized + serde::Serialize,
    {
        serde::ser::SerializeMap::serialize_entry(self, key, value)
    }

    fn end(self) -> Result<Self::Ok> {
        serde::ser::SerializeMap::end(self)
    }
}

#[doc(hidden)]
pub struct MapKeySerializer<'a, W>
where
    W: std::io::Write,
{
    writer: &'a mut Writer<W>,
}

impl<'a, W> MapKeySerializer<'a, W>
where
    W: std::io::Write,
{
    fn new(writer: &'a mut Writer<W>) -> Self {
        MapKeySerializer { writer }
    }
}

impl<'a, W> serde::Serializer for MapKeySerializer<'a, W>
where
    W: std::io::Write,
{
    type Ok = ();
    type Error = Error;

    type SerializeSeq = serde::ser::Impossible<Self::Ok, Self::Error>;
    type SerializeTuple = serde::ser::Impossible<Self::Ok, Self::Error>;
    type SerializeTupleStruct = serde::ser::Impossible<Self::Ok, Self::Error>;
    type SerializeTupleVariant = serde::ser::Impossible<Self::Ok, Self::Error>;
    type SerializeMap = serde::ser::Impossible<Self::Ok, Self::Error>;
    type SerializeStruct = serde::ser::Impossible<Self::Ok, Self::Error>;
    type SerializeStructVariant = serde::ser::Impossible<Self::Ok, Self::Error>;

    fn serialize_bool(self, _v: bool) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_i8(self, v: i8) -> Result<Self::Ok> {
        self.serialize_i64(v as i64)
    }

    fn serialize_i16(self, v: i16) -> Result<Self::Ok> {
        self.serialize_i64(v as i64)
    }

    fn serialize_i32(self, v: i32) -> Result<Self::Ok> {
        self.serialize_i64(v as i64)
    }

    fn serialize_i64(self, _v: i64) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_u8(self, v: u8) -> Result<Self::Ok> {
        self.serialize_u64(v as u64)
    }

    fn serialize_u16(self, v: u16) -> Result<Self::Ok> {
        self.serialize_u64(v as u64)
    }

    fn serialize_u32(self, v: u32) -> Result<Self::Ok> {
        self.serialize_u64(v as u64)
    }

    fn serialize_u64(self, _v: u64) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_f32(self, v: f32) -> Result<Self::Ok> {
        self.serialize_f64(v as f64)
    }

    fn serialize_f64(self, _v: f64) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_char(self, _v: char) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_str(self, v: &str) -> Result<Self::Ok> {
        self.writer.write_tag("name", v)
    }

    fn serialize_bytes(self, _v: &[u8]) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_none(self) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_some<T>(self, _v: &T) -> Result<Self::Ok>
    where
        T: ?Sized + serde::Serialize,
    {
        Err(key_must_be_a_string())
    }

    fn serialize_unit(self) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

    fn serialize_unit_struct(self, _name: &'static str) -> Result<Self::Ok> {
        Err(key_must_be_a_string())
    }

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

    fn serialize_newtype_struct<T>(self, _name: &'static str, _value: &T) -> Result<Self::Ok>
    where
        T: ?Sized + serde::Serialize,
    {
        Err(key_must_be_a_string())
    }

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

    fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
        Err(key_must_be_a_string())
    }

    fn serialize_tuple_struct(
        self,
        _name: &'static str,
        _len: usize,
    ) -> Result<Self::SerializeTupleStruct> {
        Err(key_must_be_a_string())
    }

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

    fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
        Err(key_must_be_a_string())
    }

    fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
        Err(key_must_be_a_string())
    }

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

fn key_must_be_a_string() -> Error {
    Error::from(crate::error::DecodingError::KeyMustBeString)
}