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use simd_json::{Buffers, Node};
pub use simd_json_derive_int::*;
use std::collections;
use std::io::{self, Write};
use std::iter::Peekable;
use std::vec::IntoIter;
use value_trait::generator::BaseGenerator;
mod impls;
pub type Result = io::Result<()>;

pub type Tape<'input> = Peekable<IntoIter<Node<'input>>>;

pub fn __skip(n: usize, tape: &mut Peekable<IntoIter<Node>>) {
    for _ in 0..n {
        match tape.next() {
            Some(Node::Array { count, .. }) => {
                for _ in 0..count {
                    if tape.next().is_none() {
                        return;
                    }
                }
            }
            Some(Node::Object { count, .. }) => {
                for _ in 0..count {
                    if tape.next().is_none() {
                        return;
                    }
                }
            }
            Some(_) => {}
            None => return,
        }
    }
}

pub trait Serialize {
    fn json_write<W>(&self, writer: &mut W) -> Result
    where
        W: Write;

    #[inline]
    fn json_vec(&self) -> io::Result<Vec<u8>> {
        let mut v = Vec::with_capacity(512);
        self.json_write(&mut v)?;
        Ok(v)
    }
    #[inline]
    fn json_string(&self) -> io::Result<String> {
        self.json_vec()
            .map(|v| unsafe { String::from_utf8_unchecked(v) })
    }
}

pub trait SerializeAsKey {
    fn json_write<W>(&self, writer: &mut W) -> Result
    where
        W: Write;
}
impl<T: AsRef<str>> SerializeAsKey for T {
    #[inline]
    fn json_write<W>(&self, writer: &mut W) -> Result
    where
        W: Write,
    {
        let s: &str = self.as_ref();
        s.json_write(writer)
    }
}

pub trait Deserialize<'input> {
    fn from_tape(tape: &mut Tape<'input>) -> simd_json::Result<Self>
    where
        Self: std::marker::Sized + 'input;

    #[inline]
    fn from_slice(json: &'input mut [u8]) -> simd_json::Result<Self>
    where
        Self: std::marker::Sized + 'input,
    {
        let tape = simd_json::to_tape(json)?;
        let mut itr = tape.into_iter().peekable();
        itr.next();
        Self::from_tape(&mut itr)
    }

    #[inline]
    fn from_slice_with_buffers(
        json: &'input mut [u8],
        buffers: &mut Buffers,
    ) -> simd_json::Result<Self>
    where
        Self: std::marker::Sized + 'input,
    {
        let tape = simd_json::Deserializer::from_slice_with_buffers(json, buffers)?.into_tape();
        let mut itr = tape.into_iter().peekable();
        itr.next();
        Self::from_tape(&mut itr)
    }

    #[inline]
    fn from_str(json: &'input mut str) -> simd_json::Result<Self>
    where
        Self: std::marker::Sized + 'input,
    {
        unsafe { Self::from_slice(json.as_bytes_mut()) }
    }
}

struct DummyGenerator<W: Write>(W);
impl<W: Write> BaseGenerator for DummyGenerator<W> {
    type T = W;
    #[inline]
    fn get_writer(&mut self) -> &mut <Self as BaseGenerator>::T {
        &mut self.0
    }
    #[inline]
    fn write_min(&mut self, _: &[u8], _: u8) -> io::Result<()> {
        unimplemented!()
    }
}