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use futures::channel::mpsc;
use futures::executor::LocalPool;
use slotmap::{DefaultKey, SlotMap};
use std::{
    any::{Any, TypeId},
    cell::RefCell,
    collections::{HashMap, HashSet},
    rc::Rc,
};

mod view_context;
pub use view_context::ViewContext;

mod any_view;
pub use any_view::AnyView;

mod child;
pub use self::child::Child;

mod view;
pub use view::View;

mod tree;
pub use tree::Tree;

mod into_view;
pub use self::into_view::IntoView;

mod node;
use node::Node;

mod use_ref;
pub use use_ref::{use_ref, Ref, RefMut, UseRef};

mod use_context;
pub use use_context::{use_context, use_provider, UseContext};

mod use_future;
pub use use_future::use_future;

mod use_on_drop;
pub use use_on_drop::use_on_drop;

mod use_state;
pub use use_state::{use_state, UseState};

#[cfg(feature = "html")]
pub mod html;

#[cfg(feature = "web")]
pub mod web;

pub mod prelude {
    pub use crate::{
        use_context, use_future, use_on_drop, use_provider, use_ref, use_state, IntoView,
        UseContext, UseRef, UseState, View,
    };

    #[cfg(feature = "web")]
    pub use crate::web::*;
}

#[derive(Default)]
struct GlobalContext {
    values: SlotMap<DefaultKey, Rc<RefCell<dyn Any>>>,
    dirty: HashSet<DefaultKey>,
}

thread_local! {
    static GLOBAL_CONTEXT: RefCell<GlobalContext> = RefCell::default();
}

#[derive(Clone)]
struct TaskContext {
    local_pool: Rc<RefCell<LocalPool>>,
    tx: mpsc::UnboundedSender<Box<dyn Any>>,
}

thread_local! {
    static TASK_CONTEXT: RefCell<Option<TaskContext>> = RefCell::default();
}

pub trait Platform {
    fn text(&self, s: &str) -> Box<dyn AnyView>;
}

impl Platform for () {
    fn text(&self, _s: &str) -> Box<dyn AnyView> {
        Box::new(())
    }
}

type Hook = Rc<RefCell<dyn Any>>;

struct Scope {
    hooks: Rc<RefCell<Vec<Hook>>>,
    hook_idx: usize,
    on_drops: Rc<RefCell<Vec<Box<dyn FnMut()>>>>,
    drops_idx: usize,
    contexts: HashMap<TypeId, Rc<dyn Any>>,
}

#[derive(Clone)]
struct LocalContext {
    scope: Rc<RefCell<Scope>>,
}

thread_local! {
    static LOCAL_CONTEXT: RefCell<Option<LocalContext>> = RefCell::default();
}

impl LocalContext {
    pub fn current() -> Self {
        LOCAL_CONTEXT
            .try_with(|cx| cx.borrow().as_ref().unwrap().clone())
            .unwrap()
    }

    pub fn enter(self) {
        LOCAL_CONTEXT
            .try_with(|cx| *cx.borrow_mut() = Some(self))
            .unwrap()
    }
}