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use std::{sync::Arc, thread};

use crate::*;

/// Handle to a command buffer on the GPU.
///
/// A `CommandBuffer` represents a complete sequence of commands that may be submitted to a command
/// queue with [`Queue::submit`]. A `CommandBuffer` is obtained by recording a series of commands to
/// a [`CommandEncoder`] and then calling [`CommandEncoder::finish`].
///
/// Corresponds to [WebGPU `GPUCommandBuffer`](https://gpuweb.github.io/gpuweb/#command-buffer).
#[derive(Debug)]
pub struct CommandBuffer {
    pub(crate) context: Arc<C>,
    pub(crate) data: Option<Box<Data>>,
}
#[cfg(send_sync)]
static_assertions::assert_impl_all!(CommandBuffer: Send, Sync);

impl Drop for CommandBuffer {
    fn drop(&mut self) {
        if !thread::panicking() {
            if let Some(data) = self.data.take() {
                self.context.command_buffer_drop(data.as_ref());
            }
        }
    }
}