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use super::*;
use crate::{Context, EventGate, EventListenerType, NutsCheck};

pub fn register_frame<F: Frame + Activity>(
    frame: F,
    state: F::State,
    pos: (u32, u32),
) -> FrameHandle<F> {
    nuts::store_to_domain(&Domain::Frame, state);
    register_frame_no_state(frame, pos)
}

/// Use this if the state has already been registered previously.
pub fn register_frame_no_state<F: Frame + Activity>(frame: F, pos: (u32, u32)) -> FrameHandle<F> {
    let div = div::new(pos.0, pos.1, F::WIDTH, F::HEIGHT, "").expect("Div failure");
    let activity = nuts::new_domained_activity(frame, &Domain::Frame);
    let area = Rectangle::new(pos, F::size());
    let handle = FrameHandle::new(activity, div, area);
    handle.init_frame_activity();
    handle
}

/// Use this if the state needs access to the graphics environment
pub fn register_frame_with<F, INIT>(
    frame: F,
    state_initializer: INIT,
    pos: (u32, u32),
) -> FrameHandle<F>
where
    F: Frame + Activity,
    INIT: FnOnce(&mut Display) -> F::State + 'static,
{
    // This mess calls for a better solution, probably in nuts?

    // To defer execution:
    // 1) Create a new dummy activity for each registration (unique types necessary)
    let dummy: Nop<F> = Nop {
        _phantom: std::marker::PhantomData,
    };
    let dummy_aid = nuts::new_domained_activity(dummy, &Domain::Frame);
    // 2) Execute actual state initializer in on_delete. Initialization just Fn is not enough, it has to be FnOnce, thus it has to be registered on on_delete.
    dummy_aid.on_delete_domained(move |_, d: &mut DomainState| {
        nuts::store_to_domain(&Domain::Frame, state_initializer(Display::from_domain(d)));
    });
    let fh = register_frame_no_state(frame, pos);
    // 3) Trigger on_delete
    dummy_aid.set_status(nuts::LifecycleStatus::Deleted);
    fh
}

// Helper for checking if default has been overwritten
struct Nop<STATE> {
    _phantom: std::marker::PhantomData<STATE>,
}
impl<STATE> Frame for Nop<STATE> {
    type State = STATE;
    const WIDTH: u32 = 0;
    const HEIGHT: u32 = 0;
}

impl<STATE: 'static, F: Frame<State = STATE> + Activity> FrameHandle<F> {
    fn init_frame_activity(&self) {
        let activity = self.activity();
        let area = self.region();
        let div: div::DivHandle = self.div().clone();
        if (F::update as usize) != (Nop::<F::State>::update as usize) {
            activity.subscribe_domained(|a, d, _msg: &UpdateWorld| {
                let global_state: &mut F::State = d.try_get_mut().expect("Activity State missing");
                a.update(global_state)
            });
        }
        if (F::draw as usize) != (Nop::<F::State>::draw as usize) {
            activity.subscribe_domained(move |a: &mut F, d: &mut DomainState, msg: &DrawWorld| {
                let (global_state, ctx) = d.try_get_2_mut::<F::State, Context>();
                let canvas = ctx
                    .expect("Context missing")
                    .display_region(area, div.clone());
                a.draw(
                    global_state.expect("Activity State missing"),
                    canvas,
                    msg.time_ms,
                )
            });
        }
        if (F::pointer as usize) != (Nop::<F::State>::pointer as usize) {
            activity.private_domained_channel(|a, d, msg: PointerEvent| {
                let (global_state, ctx) = d.try_get_2_mut::<F::State, Context>();
                let global_state: &mut F::State = global_state.expect("Activity State missing");
                let display = ctx.expect("Context missing").display.full();
                let projected_pos = msg.1 / display.browser_to_game_pixel_ratio();
                a.pointer(global_state, PointerEvent(msg.0, projected_pos))
            });
            // Clicks are available in all browsers and should be generated even from touchstart + touchend, as long as it is not cancelled explicitly.
            EventGate::listen(self, EventListenerType::Click);
            if js::supports_pointer_events() {
                // For all browsers that support pointer events
                EventGate::listen(self, EventListenerType::BrowserPointer);
            } else {
                // Mouse and touch input for browsers without pointer events
                EventGate::listen(self, EventListenerType::Mouse);
                EventGate::listen(self, EventListenerType::Touch);
            }
        }
        let div: div::DivHandle = self.div().clone();
        if (F::enter as usize) != (Nop::<F::State>::enter as usize) {
            activity.on_enter_domained(move |a, d| {
                div.show().nuts_check();
                let global_state: &mut F::State = d.try_get_mut().expect("Activity State missing");
                a.enter(global_state)
            });
        }
        let div: div::DivHandle = self.div().clone();
        if (F::leave as usize) != (Nop::<F::State>::leave as usize) {
            activity.on_leave_domained(move |a, d| {
                div.hide().nuts_check();
                let global_state: &mut F::State = d.try_get_mut().expect("Activity State missing");
                a.leave(global_state)
            });
        }
        if (F::key as usize) != (Nop::<F::State>::key as usize) {
            activity.private_domained_channel(|a, d, msg: KeyEvent| {
                let global_state = d.try_get_mut::<F::State>().expect("Activity State missing");
                a.key(global_state, msg)
            });
            EventGate::listen(self, EventListenerType::Keyboard)
        }
    }
}
impl<STATE: 'static, FRAME: Frame<State = STATE>> FrameHandle<FRAME> {
    pub fn listen<F, MSG>(&self, f: F)
    where
        F: Fn(&mut FRAME, &mut STATE, &MSG) + Copy + 'static,
        MSG: 'static,
        FRAME: 'static,
    {
        self.activity_id.subscribe_domained_masked(
            SubscriptionFilter::no_filter(),
            move |a, d, msg: &GlobalEvent<MSG>| {
                let global_state: &mut FRAME::State =
                    d.try_get_mut().expect("Activity State missing");
                f(a, global_state, &msg.0);
            },
        );

        self.activity_id
            .subscribe_domained(move |a, d, msg: &ActiveEvent<MSG>| {
                let global_state: &mut FRAME::State =
                    d.try_get_mut().expect("Activity State missing");
                f(a, global_state, &msg.0);
            });
    }
}
impl<STATE: 'static, FRAME: Frame<State = STATE>> FrameHandle<FRAME> {
    pub fn register_receiver<F, MSG>(&self, f: F)
    where
        F: Fn(&mut FRAME, &mut STATE, MSG) + Copy + 'static,
        MSG: 'static,
        FRAME: 'static,
    {
        self.activity_id.private_domained_channel_masked(
            SubscriptionFilter::no_filter(),
            move |a, d, msg: PrivateEvent<MSG, FRAME>| {
                let global_state: &mut FRAME::State =
                    d.try_get_mut().expect("Activity State missing");
                f(a, global_state, msg.0);
            },
        );
    }
}