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use tabs::{TabsBuilder, Tabs};
use rin::window::{self, WindowT, Window, Events, MouseEvents, Cursor, MouseEvent, MouseButton};
use rin::math::{Vec2, Pnt2, Rect, vec2, origin, pnt2, clamp};
use rin::events::{StreamRc, StreamT, Property, IterAsync};
use std::mem;
use traits::{ControlEvents, ControlBuilder};

pub type Width = f32;
pub type Height = f32;
pub type Pos = Pnt2;

#[derive(Copy, Clone, Debug, PartialEq)]
pub enum Mode{
    Left(Width),
    Right(Width),
    Top(Height),
    Bottom(Height),
    Free(Pos, Width, Height)
}

pub struct ResizableContainer<C>{
    control: C,
    cursor: IterAsync<'static, Cursor>,
    non_attended: StreamRc<'static, window::Event>,
}

impl<C> ResizableContainer<C>{
    pub fn control(&self) -> &C{
        &self.control
    }

    pub fn control_mut(&mut self) -> &mut C{
        &mut self.control
    }
}

impl ResizableContainer<Tabs>{
    pub fn new_tabs<S>(mode: Mode, events: S, viewport: Property<'static, Rect<i32>>) -> ResizableContainer<Tabs>
        where S: StreamT<'static, window::Event>,
    {
        let events = events.rc();
        let width;
        let height;
        match mode {
            Mode::Left(w) | Mode::Right(w) => {
                width = Property::new(w);
                height = viewport.clone().map(|r| r.height as f32);
            }
            Mode::Top(h) | Mode::Bottom(h) => {
                width = viewport.clone().map(|r| r.width as f32);
                height = Property::new(h);
            }
            Mode::Free(_, w, h) => {
                width = Property::new(w);
                height = Property::new(h);
            }
        }
        let pos = match mode {
            Mode::Left(_) | Mode::Top(_) => Property::new(pnt2(0., 0.)),
            Mode::Right(_) => viewport.clone()
                .map(|r| r.width)
                .zip(width.clone()).map(|(vw, w)| pnt2(vw as f32 - w, 0.)),
            Mode::Bottom(_) => viewport.clone()
                .map(|r| r.height)
                .zip(height.clone()).map(|(vh, h)| pnt2(0., vh as f32 - h)),
            Mode::Free(pos,_,_) => Property::new(pos),
        };

        let on_resize_area = {
            let width = width.clone();
            let height = height.clone();
            let control_pos = pos.clone();
            events.clone().mouse().moved().map(move |pos| match mode{
                Mode::Left(_) => pos.x as f32 > *width - 1. && (pos.x as f32) < *width + 5.,
                Mode::Right(_) => pos.x as f32 > control_pos.x - 5. && (pos.x as f32) < control_pos.x + 1.,
                Mode::Top(_) => pos.y as f32 > *height -1. && (pos.y as f32) < *width + 5.,
                Mode::Bottom(_) => pos.y as f32 > control_pos.y - 5. && (pos.y as f32) < control_pos.y + 1.,
                Mode::Free(_,_,_) => false,
            }).to_property(false)
        };


        #[derive(Clone, Debug, Copy, PartialEq)]
        enum State{
            Disabled,
            OnResizeArea,
            Resizing(Vec2<f32>, Pnt2<f64>),
        }
        let w = *width;
        let h = *height;
        let size = {
            let on_resize_area = on_resize_area.clone();
            let mut control_pos = pos.clone();
            events.clone().mouse().fold((width, height, State::Disabled), move |(mut width, mut height, mut state), mouse_event|{
                match mouse_event{
                    MouseEvent::Pressed{pos, button: MouseButton::Left, ..} => if *on_resize_area{
                        state = State::Resizing(vec2!(*width, *height), pos);
                    }
                    MouseEvent::Released{button: MouseButton::Left, ..} => state = State::Disabled,
                    MouseEvent::Moved{pos} => {
                        match state{
                            State::Resizing(start_size, start_pos) => match mode{
                                Mode::Left(_) => {
                                    let diff = pos.x - start_pos.x;
                                    let w = clamp(start_size.x + diff as f32, 0., viewport.width as f32);
                                    width.set(w);
                                },
                                Mode::Right(_) => {
                                    let diff = start_pos.x - pos.x;
                                    let w = clamp(start_size.x + diff as f32, 0., viewport.width as f32);
                                    width.set(w);
                                    let x = clamp((start_pos.x - diff) as f32, 0., viewport.width as f32);
                                    let y = control_pos.y;
                                    control_pos.set(pnt2(x, y));
                                }
                                Mode::Top(_) => {
                                    let diff = pos.y - start_pos.y;
                                    let h = clamp(start_size.y + diff as f32, 0., viewport.height as f32);
                                    height.set(h);
                                }
                                Mode::Bottom(_) => {
                                    let diff = start_pos.y - pos.y;
                                    let h = clamp(start_size.x + diff as f32, 0., viewport.height as f32);
                                    height.set(h);
                                    let x = control_pos.x;
                                    let y = clamp((start_pos.y - diff) as f32, 0., viewport.height as f32);
                                    control_pos.set(pnt2(x, y));
                                }
                                Mode::Free(_,_,_) => {

                                },
                            },
                            _ => if *on_resize_area{
                                state = State::OnResizeArea;
                            }else{
                                state = State::Disabled;
                            },
                        }
                    }
                    _ => (),
                }
                (width, height, state)
            }).map(|(w,h,s)| (*w, *h, s)).rc()
        };


        let state = size.clone().map(|(_,_,s)| s).dedup().rc();

        let width = size.clone().map(|(w,_,_)| w).to_property(w);
        let widthh = width.clone();
        let width = events.clone().update().map(move |_| *widthh)
            .dedup()
            .throttle(30.)
            .merge(state.clone().filter_map(move |state| if state == State::Disabled{
                Some(*width)
            }else{
                None
            }))
            .to_property(w);

        let height = size.clone().map(|(_,h,_)| h).to_property(h);
        let heightt = height.clone();
        let height = events.clone().update().map(move |_| *heightt)
            .dedup()
            .throttle(30.)
            .merge(state.clone().filter_map(move |state| if state == State::Disabled{
                Some(*height)
            }else{
                None
            }))
            .to_property(h);


        let cursor = state.clone().map(move |state|{
            match state{
                State::Disabled => Cursor::Arrow,
                State::OnResizeArea | State::Resizing(_,_) => match mode{
                    Mode::Left(_) | Mode::Right(_) => Cursor::HResize,
                    Mode::Top(_) | Mode::Bottom(_) => Cursor::VResize,
                    Mode::Free(_,_,_) => Cursor::Arrow,
                }
            }
        }).dedup().iter_async();

        let tabs = TabsBuilder::new("", pos, events)
            .width_property(width.clone())
            .max_height(height.clone().map(|h| Some(h)))
            .create();

        let non_attended = {
            let state = state.to_property(State::Disabled);
            tabs.non_attended().filter(move |e|{
                if let window::Event::MousePressed{..} = e {
                    return !*on_resize_area;
                }
                mem::discriminant(&*state) != mem::discriminant(&State::Resizing(vec2!(0.), origin()))
            }).rc()
        };

        ResizableContainer{
            control: tabs,
            cursor,
            non_attended,
        }
    }

    pub fn update(&mut self, window: &mut Window){
        if let Some(cursor) = self.cursor.by_ref().last(){
            window.set_cursor(cursor);
        }
    }

    pub fn non_attended(&self) -> StreamRc<'static, window::Event>{
        self.non_attended.clone()
    }
}