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extern crate piston;
extern crate glutin_window;

use std::rc::Rc;
use std::cell::RefCell;
use std::os::raw::c_void;
use std::ops::Deref;
use glium::backend::{ Backend, Context, Facade };
use glium::{ GliumCreationError, Frame, SwapBuffersError };
use self::piston::event_loop::{ EventLoop, WindowEvents };
use self::piston::window::{
    AdvancedWindow, BuildFromWindowSettings, OpenGLWindow, Size, Window, WindowSettings
};
use self::piston::input::{ Event, GenericEvent };
use self::glutin_window::GlutinWindow;

#[derive(Clone)]
struct Wrapper<W>(Rc<RefCell<W>>);

/// A window struct for glium.
pub struct GliumWindow<W = GlutinWindow> {
    /// Window.
    pub window: Rc<RefCell<W>>,
    /// Glium context.
    pub context: Rc<Context>,
    /// Event loop state.
    pub events: WindowEvents
}

impl<W> Deref for GliumWindow<W> {
    type Target = Context;

    fn deref(&self) -> &Context {
        &self.context
    }
}

impl<W> Clone for GliumWindow<W> {
    fn clone(&self) -> GliumWindow<W> {
        GliumWindow {
            window: self.window.clone(),
            context: self.context.clone(),
            events: self.events.clone()
        }
    }
}

impl<W> BuildFromWindowSettings for GliumWindow<W>
    where W: 'static + Window + OpenGLWindow + BuildFromWindowSettings,
          W::Event: GenericEvent
{
    fn build_from_window_settings(mut settings: WindowSettings)
    -> Result<GliumWindow<W>, String> {
        // Turn on sRGB.
        settings = settings.srgb(true);
        GliumWindow::new(&Rc::new(RefCell::new(try!(settings.build()))))
            .map_err(|err| match err {
                GliumCreationError::BackendCreationError(..) =>
                    "Error while creating the backend",
                GliumCreationError::IncompatibleOpenGl(..) =>
                    "The OpenGL implementation is too old to work with glium",
            }.into())
    }
}

impl<W> GliumWindow<W>
    where W: OpenGLWindow + 'static
{
    /// Creates new GliumWindow.
    pub fn new(window: &Rc<RefCell<W>>) -> Result<Self, GliumCreationError<()>> {
        unsafe {
            Context::new(Wrapper(window.clone()), true, Default::default())
        }.map(|context| GliumWindow {
            window: window.clone(),
            context: context,
            events: WindowEvents::new().swap_buffers(false)
        })
    }

    /// Returns new frame.
    pub fn draw(&self) -> Frame {
        Frame::new(self.context.clone(), self.context.get_framebuffer_dimensions())
    }

    /// Returns next event.
    pub fn next(&mut self) -> Option<Event<<W as Window>::Event>> {
        self.events.next(&mut *self.window.borrow_mut())
    }
}

impl<W> Facade for GliumWindow<W> {
    fn get_context(&self) -> &Rc<Context> {
        &self.context
    }
}

unsafe impl<W> Backend for Wrapper<W> where W: OpenGLWindow {
    fn swap_buffers(&self) -> Result<(), SwapBuffersError> {
        self.0.borrow_mut().swap_buffers();
        Ok(())
    }

    unsafe fn get_proc_address(&self, proc_name: &str) -> *const c_void {
        self.0.borrow_mut().get_proc_address(proc_name) as *const c_void
    }

    fn get_framebuffer_dimensions(&self) -> (u32, u32) {
        let size = self.0.borrow().size();
        (size.width, size.height)
    }

    fn is_current(&self) -> bool {
        self.0.borrow().is_current()
    }

    unsafe fn make_current(&self) {
        self.0.borrow_mut().make_current()
    }
}

impl<W> Window for GliumWindow<W>
    where W: Window
{
    type Event = <W as Window>::Event;

    fn should_close(&self) -> bool { self.window.borrow().should_close() }
    fn set_should_close(&mut self, value: bool) {
        self.window.borrow_mut().set_should_close(value)
    }
    fn size(&self) -> Size { self.window.borrow().size() }
    fn draw_size(&self) -> Size { self.window.borrow().draw_size() }
    fn swap_buffers(&mut self) { self.window.borrow_mut().swap_buffers() }
    fn poll_event(&mut self) -> Option<Self::Event> {
        Window::poll_event(&mut *self.window.borrow_mut())
    }
}

impl<W> AdvancedWindow for GliumWindow<W>
    where W: AdvancedWindow
{
    fn get_title(&self) -> String { self.window.borrow().get_title() }
    fn set_title(&mut self, title: String) {
        self.window.borrow_mut().set_title(title)
    }
    fn get_exit_on_esc(&self) -> bool { self.window.borrow().get_exit_on_esc() }
    fn set_exit_on_esc(&mut self, value: bool) {
        self.window.borrow_mut().set_exit_on_esc(value)
    }
    fn set_capture_cursor(&mut self, value: bool) {
        self.window.borrow_mut().set_capture_cursor(value)
    }
}

impl<W> EventLoop for GliumWindow<W> {
    fn set_ups(&mut self, frames: u64) {
        self.events.set_ups(frames);
    }

    fn set_max_fps(&mut self, frames: u64) {
        self.events.set_max_fps(frames);
    }

    fn set_swap_buffers(&mut self, enable: bool) {
        self.events.set_swap_buffers(enable);
    }

    fn set_bench_mode(&mut self, enable: bool) {
        self.events.set_bench_mode(enable);
    }
}