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use crate::Data;
use serde::{Serialize, Deserialize};
use anyhow::*;

impl Data{
    #[cfg(all(feature = "rmp",not(feature = "json")))]
    pub fn pack_to<'a,T:Deserialize<'a>>(&'a mut self) ->Result<T>{
        Ok(rmp_serde::decode::from_read_ref(&self[..])?)
    }

    #[cfg(all(feature = "rmp",not(feature = "json")))]
    pub fn pack_from<T: Serialize>(value:T) ->Result<Data> {
        Ok(rmp_serde::encode::to_vec(&value)?.into())
    }

    #[cfg(all(feature = "rmp",not(feature = "json")))]
    pub fn pack_deserialize<'a,T:Deserialize<'a>>(&'a mut self) ->Result<T> {
        self.mode=1;
        let bak_offset=self.offset;
        match self.serde_deserialize(){
            Ok(value)=>Ok(value),
            Err(_)=>{
                self.set_position(bak_offset);
                let len = self.get_le::<u32>()? as usize;
                let start = self.offset;
                if !self.set_position(start + len) {
                    bail!("index overflow {}", line!())
                }
                Ok(rmp_serde::decode::from_read_ref(&self[start..self.offset])?)
            }
        }
    }
    #[cfg(all(feature = "rmp",not(feature = "json")))]
    pub fn pack_serialize<T:Serialize>(&mut self, value:T) ->Result<()> {
        self.mode=1;
        let bak=self.len();
        if self.serde_serialize(&value).is_err() {
            self.buf.truncate(bak);
            let buff = rmp_serde::encode::to_vec(&value)?;
            self.write_buff_fixed_le(&buff);
        }
        Ok(())
    }

    #[cfg(all(feature = "json", feature = "rmp"))]
    pub fn pack_to<'a,T:Deserialize<'a>>(&'a mut self) ->Result<T>{
        Ok(serde_json::from_slice(&self[..])?)
    }

    #[cfg(all(feature = "json",feature = "rmp"))]
    pub fn pack_from<T: Serialize>(value:T) ->Result<Data> {
        Ok(serde_json::to_vec(&value)?.into())
    }

    #[cfg(all(feature = "json",feature = "rmp"))]
    pub fn pack_deserialize<'a,T:Deserialize<'a>>(&'a mut self) ->Result<T> {
        self.mode=1;
        let bak_offset=self.offset;
        match self.serde_deserialize(){
            Ok(value)=>{
                self.mode=0;
                Ok(value)
            },
            Err(_)=>{
                self.mode=0;
                self.set_position(bak_offset);
                let len = self.get_le::<u32>()? as usize;
                let start = self.offset;
                if !self.set_position(start + len) {
                    bail!("index overflow {}", line!())
                }
                Ok(serde_json::from_slice(&self[start..self.offset])?)
            }
        }
    }

    #[cfg(all(feature = "json",feature = "rmp"))]
    pub fn pack_serialize<T:Serialize>(&mut self, value:T) ->Result<()> {
        self.mode=1;
        let bak=self.len();
        if self.serde_serialize(&value).is_err() {
            self.buf.truncate(bak);
            let buff = serde_json::to_vec(&value)?;
            self.write_buff_fixed_le(&buff);
        }
        self.mode=0;
        Ok(())
    }
}