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use ash::version::DeviceV1_0;
use ash::vk;
use smallvec::SmallVec;
use std::ptr;
use std::sync::Arc;

use crate::command::CommandBuffer;
use crate::conv;
use crate::{Backend, RawDevice};
use hal::{command, pool};

#[derive(Debug)]
pub struct RawCommandPool {
    pub(crate) raw: vk::CommandPool,
    pub(crate) device: Arc<RawDevice>,
}

impl pool::CommandPool<Backend> for RawCommandPool {
    unsafe fn reset(&mut self, release_resources: bool) {
        let flags = if release_resources {
            vk::CommandPoolResetFlags::RELEASE_RESOURCES
        } else {
            vk::CommandPoolResetFlags::empty()
        };

        assert_eq!(Ok(()), self.device.raw.reset_command_pool(self.raw, flags));
    }

    unsafe fn allocate<E>(&mut self, num: usize, level: command::Level, list: &mut E)
    where
        E: Extend<CommandBuffer>,
    {
        let info = vk::CommandBufferAllocateInfo {
            s_type: vk::StructureType::COMMAND_BUFFER_ALLOCATE_INFO,
            p_next: ptr::null(),
            command_pool: self.raw,
            level: conv::map_command_buffer_level(level),
            command_buffer_count: num as u32,
        };

        let device = &self.device;

        list.extend(
            device
                .raw
                .allocate_command_buffers(&info)
                .expect("Error on command buffer allocation")
                .into_iter()
                .map(|buffer| CommandBuffer {
                    raw: buffer,
                    device: Arc::clone(device),
                }),
        );
    }

    unsafe fn free<I>(&mut self, cbufs: I)
    where
        I: IntoIterator<Item = CommandBuffer>,
    {
        let buffers: SmallVec<[vk::CommandBuffer; 16]> =
            cbufs.into_iter().map(|buffer| buffer.raw).collect();
        self.device.raw.free_command_buffers(self.raw, &buffers);
    }
}