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use std::ffi::c_void;
use std::sync::Arc;

use erupt::vk;
#[cfg(feature = "tracing")]
use tracing1::error;

use crate::context::Context;
use crate::{AscheError, Result};

/// Wraps a Query Pool.
#[derive(Debug)]
pub struct QueryPool {
    raw: vk::QueryPool,
    context: Arc<Context>,
}

impl QueryPool {
    pub(crate) fn new(raw: vk::QueryPool, context: Arc<Context>) -> Self {
        Self { raw, context }
    }

    /// The raw Vulkan query pool handle.
    #[inline]
    pub fn raw(&self) -> vk::QueryPool {
        self.raw
    }

    /// Copy results of queries in a query pool to a host memory region.
    #[doc = "[Vulkan Manual Page](https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vkGetQueryPoolResults.html)"]
    #[cfg_attr(feature = "profiling", profiling::function)]
    pub unsafe fn results(
        &self,
        first_query: u32,
        query_count: u32,
        data: &mut [u8],
        stride: u64,
        flags: Option<vk::QueryResultFlags>,
    ) -> Result<()> {
        #[allow(clippy::as_conversions)]
        self.context
            .device
            .get_query_pool_results(
                self.raw,
                first_query,
                query_count,
                data.len(),
                data.as_mut_ptr() as *mut c_void,
                stride,
                flags,
            )
            .map_err(|err| {
                #[cfg(feature = "tracing")]
                error!(
                    "Unable to copy results of queries in a query pool to a host memory region: {}",
                    err
                );
                AscheError::VkResult(err)
            })
    }
}

impl Drop for QueryPool {
    fn drop(&mut self) {
        unsafe {
            self.context.device.destroy_query_pool(Some(self.raw), None);
        }
    }
}