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use std::sync::Arc;
use vks;
use ::{VdResult, SwapchainKhr, Device, ImageHandle, Handle};


#[derive(Clone, Copy, Debug, Eq, PartialEq)]
#[repr(C)]
pub struct ImageViewHandle(pub(crate) vks::VkImageView);

impl ImageViewHandle {
    #[inline(always)]
    pub fn to_raw(&self) -> vks::VkImageView {
        self.0
    }
}

unsafe impl Handle for ImageViewHandle {
    type Target = ImageViewHandle;

    /// Returns this object's handle.
    #[inline(always)]
    fn handle(&self) -> Self::Target {
        *self
    }
}


#[derive(Debug)]
pub struct Inner {
    handle: ImageViewHandle,
    device: Device,
    swapchain: Option<SwapchainKhr>,
}

#[derive(Debug, Clone)]
pub struct ImageView {
    inner: Arc<Inner>,
}

impl ImageView {
    /// Returns a new `ImageViewBuilder`.
    pub fn builder<'b>() -> ImageViewBuilder<'b> {
        ImageViewBuilder::new()
    }

    /// Returns this object's handle.
    pub fn handle(&self) -> ImageViewHandle {
        self.inner.handle
    }

    /// Returns a reference to the associated device.
    pub fn device(&self) -> &Device {
        &self.inner.device
    }
}

unsafe impl<'i> Handle for &'i ImageView {
    type Target = ImageViewHandle;

    #[inline(always)]
    fn handle(&self) -> Self::Target {
        self.inner.handle
    }
}

impl Drop for Inner {
    fn drop(&mut self) {
        unsafe {
            // self.device.proc_addr_loader().vk.vkDestroyImageView(self.device.handle().0,
            //     self.handle.0, ptr::null());
            self.device.destroy_image_view(self.handle, None);
        }
    }
}

/// A builder for an `ImageView`.
#[derive(Debug, Clone)]
pub struct ImageViewBuilder<'b> {
    create_info: ::ImageViewCreateInfo<'b>,
}

impl<'b> ImageViewBuilder<'b> {
    /// Returns a new `ImageViewBuilder`.
    pub fn new() -> ImageViewBuilder<'b> {
        ImageViewBuilder { create_info: ::ImageViewCreateInfo::default() }
    }

    /// Specifies the image on which the view will be created.
    pub fn image<'s, H>(&'s mut self, image: H) -> &'s mut ImageViewBuilder<'b>
            where H: Handle<Target=ImageHandle> {
        self.create_info.set_image(image);
        self
    }

    /// Specifies the type of the image view.
    pub fn view_type<'s>(&'s mut self, view_type: ::ImageViewType) -> &'s mut ImageViewBuilder<'b> {
        self.create_info.set_view_type(view_type);
        self
    }

    /// Specifies the format and type used to interpret data elements in the
    /// image.
    pub fn format<'s>(&'s mut self, format: ::Format) -> &'s mut ImageViewBuilder<'b> {
        self.create_info.set_format(format);
        self
    }

    /// Specifies a remapping of color components (or of depth or stencil
    /// components after they have been converted into color components).
    pub fn components<'s>(&'s mut self, components: ::ComponentMapping)
            -> &'s mut ImageViewBuilder<'b> {
        self.create_info.set_components(components);
        self
    }

    /// Specifies the range selecting the set of mipmap levels and array
    /// layers to be accessible to the view.
    pub fn subresource_range<'s>(&'s mut self, subresource_range: ::ImageSubresourceRange)
            -> &'s mut ImageViewBuilder<'b> {
        self.create_info.set_subresource_range(subresource_range);
        self
    }

    pub fn build(&self, device: Device, swapchain: Option<SwapchainKhr>) -> VdResult<ImageView> {
        // let mut handle = 0;

        // unsafe {
        //     ::check(device.proc_addr_loader().vk.vkCreateImageView(device.handle().0,
        //         self.create_info.as_raw(), ptr::null(), &mut handle));
        // }

        let handle = unsafe { device.create_image_view(&self.create_info, None)? };

        Ok(ImageView {
            inner: Arc::new(Inner {
                // handle: ImageViewHandle(handle),
                handle,
                device,
                swapchain,
            })
        })
    }
}