use std::io::Read;

use pumpkin_data::packet::serverbound::PLAY_CUSTOM_PAYLOAD;
use pumpkin_macros::java_packet;
use pumpkin_util::version::JavaMinecraftVersion;

use crate::{ReadingError, ServerPacket, ser::NetworkReadExt};

/// The maximum allowed size for a play custom payload (32 KiB).
const MAX_PAYLOAD_SIZE: usize = 32_767;

/// A packet used for custom communication between the client and server.
///
/// This allows mods, plugins, or proxy software to send proprietary data over the standard
/// Minecraft protocol.
#[java_packet(PLAY_CUSTOM_PAYLOAD)]
pub struct SCustomPayload {
    /// The name of the channel used to distinguish different types of messages.
    /// Example: `minecraft:brand` or `voicechat:request_secret`.
    pub channel: Box<str>,
    /// The payload sent by the client.
    pub data: Box<[u8]>,
}

impl ServerPacket for SCustomPayload {
    fn read(mut read: impl Read, _version: &JavaMinecraftVersion) -> Result<Self, ReadingError> {
        Ok(Self {
            channel: read.get_str()?,
            data: read.read_remaining_to_boxed_slice(MAX_PAYLOAD_SIZE)?,
        })
    }
}