use std::io::{Seek, SeekFrom};

use psopacket::pso_message;
use crate::{PSOPacketData, PacketParseError};


pub trait PSOMessage {
    const CMD: u8;
    fn from_bytes<R: std::io::Read + std::io::Seek>(cur: &mut R) -> Result<Self, PacketParseError> where Self: Sized;
    fn as_bytes(&self) -> Vec<u8>;
}


#[pso_message(0x40)]
pub struct PlayerWalking {
    x: f32,
    y: f32,
    z: f32,
}


#[derive(Debug, Clone, PartialEq)]
pub enum GameMessage {
    PlayerWalking(PlayerWalking),
}

impl PSOPacketData for GameMessage {
    fn from_bytes<R: std::io::Read + std::io::Seek>(mut cur: &mut R) -> Result<Self, PacketParseError> {
        let mut byte = [0u8; 1];
        cur.read(&mut byte);
        cur.seek(SeekFrom::Current(-1)); // Cursor doesn't implement Peek?
        match byte[0] {
            PlayerWalking::CMD => Ok(GameMessage::PlayerWalking(PlayerWalking::from_bytes(&mut cur)?)),
            _ => Err(PacketParseError::WrongPacketCommand),
        }
    }
    fn as_bytes(&self) -> Vec<u8> {
        match self {
            GameMessage::PlayerWalking(data) => data.as_bytes(),
        }
    }
}