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

use core::{From, Registry};
use core::compositor::{Region, WSurface};

use ffi::interfaces::compositor::{wl_compositor, wl_compositor_destroy};
use ffi::{FFI, Bind, abi};

struct CompositorInternal {
    _registry: Registry,
    ptr: *mut wl_compositor
}

// CompositorInternal is owning
unsafe impl Send for CompositorInternal {}

/// A wayland compositor.
///
/// This is the back-end that will be used for all drawing.
///
/// Like other global objects, this handle can be cloned.
#[derive(Clone)]
pub struct Compositor {
    internal: Arc<Mutex<CompositorInternal>>
}

impl Compositor {
    /// Creates a new surface to draw on.
    pub fn create_surface(&self) -> WSurface {
        From::from(self.clone())
    }

    /// Creates a new region.
    pub fn create_region(&self) -> Region {
        From::from(self.clone())
    }
}

impl Bind<Registry> for Compositor {

    fn interface() -> &'static abi::wl_interface {
        #[cfg(feature = "dlopen")] use ffi::abi::WAYLAND_CLIENT_HANDLE;
        #[cfg(not(feature = "dlopen"))] use ffi::abi::wl_compositor_interface;
        ffi_dispatch_static!(WAYLAND_CLIENT_HANDLE, wl_compositor_interface)
    }

    unsafe fn wrap(ptr: *mut wl_compositor, registry: Registry) -> Compositor {
        Compositor {
            internal: Arc::new(Mutex::new(CompositorInternal {
                _registry: registry,
                ptr: ptr
            }))
        }
    }
}

impl Drop for CompositorInternal {
    fn drop(&mut self) {
        unsafe { wl_compositor_destroy(self.ptr) };
    }
}

impl FFI for Compositor {
    type Ptr = wl_compositor;

    fn ptr(&self) -> *const wl_compositor {
        self.internal.lock().unwrap().ptr as *const wl_compositor
    }

    unsafe fn ptr_mut(&self) -> *mut wl_compositor {
        self.internal.lock().unwrap().ptr
    }
}