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use prelude::*;
use std::ptr;
use std::mem;
use instance::Instance;
use device::Device;
use vk;
use std::ffi::CStr;

pub struct Swapchain {
    handle: vk::Device,
    swapchain_fn: vk::SwapchainFn,
}

impl Swapchain {
    pub fn new(instance: &Instance, device: &Device) -> Result<Swapchain, String> {
        let swapchain_fn = vk::SwapchainFn::load(|name| {
            unsafe { mem::transmute(instance.get_device_proc_addr(device.handle(), name.as_ptr())) }
        })?;
        Ok(Swapchain {
            handle: device.handle(),
            swapchain_fn: swapchain_fn,
        })
    }

    pub fn name() -> &'static CStr{
        CStr::from_bytes_with_nul(b"VK_KHR_swapchain\0").expect("Wrong extension string")
    }

    pub unsafe fn destroy_swapchain_khr(&self, swapchain: vk::SwapchainKHR) {
        self.swapchain_fn.destroy_swapchain_khr(self.handle, swapchain, ptr::null());
    }

    pub unsafe fn acquire_next_image_khr(&self,
                                         swapchain: vk::SwapchainKHR,
                                         timeout: vk::uint64_t,
                                         semaphore: vk::Semaphore,
                                         fence: vk::Fence)
                                         -> VkResult<vk::uint32_t> {
        let mut index = mem::uninitialized();
        let err_code = self.swapchain_fn
            .acquire_next_image_khr(self.handle,
                                    swapchain,
                                    timeout,
                                    semaphore,
                                    fence,
                                    &mut index);
        match err_code {
            vk::Result::Success => Ok(index),
            _ => Err(err_code),
        }
    }

    pub fn create_swapchain_khr(&self,
                                create_info: &vk::SwapchainCreateInfoKHR)
                                -> VkResult<vk::SwapchainKHR> {
        unsafe {
            let mut swapchain = mem::uninitialized();
            let err_code = self.swapchain_fn
                .create_swapchain_khr(self.handle, create_info, ptr::null(), &mut swapchain);
            match err_code {
                vk::Result::Success => Ok(swapchain),
                _ => Err(err_code),
            }
        }
    }

    pub fn get_swapchain_images_khr(&self,
                                    swapchain: vk::SwapchainKHR)
                                    -> VkResult<Vec<vk::Image>> {
        unsafe {
            let mut count = 0;
            self.swapchain_fn
                .get_swapchain_images_khr(self.handle, swapchain, &mut count, ptr::null_mut());

            let mut v = Vec::with_capacity(count as vk::size_t);
            let err_code = self.swapchain_fn
                .get_swapchain_images_khr(self.handle, swapchain, &mut count, v.as_mut_ptr());
            v.set_len(count as vk::size_t);
            match err_code {
                vk::Result::Success => Ok(v),
                _ => Err(err_code),
            }
        }
    }
}