use std::cell::RefCell;
use std::rc::Rc;

use yew::prelude::*;

pub mod command_handler;
pub mod lineengine;
pub mod lua_state;
pub mod parsing;
pub mod split_panel;
pub mod term_view;
use crate::lua_state::{install_lua_globals, LuaState};
use crate::split_panel::*;
use crate::term_view::*;

#[derive(Properties)]
pub struct GlobalState {
    // No strong references allowed between each of these groups of state.
    frame_registry: RefCell<RegisteredTermFrames>,
    lua_engine: RefCell<LuaState>,
}
type GlobalCell = Rc<GlobalState>;

// Used only for yew. Always equal since we don't want it to
// actually look into GlobalState, changes there should never
// cause a re-render.
impl PartialEq for GlobalState {
    fn eq(&self, _other: &Self) -> bool {
        true
    }
}

#[function_component(App)]
fn app() -> Html {
    let global = use_memo((), |_| GlobalState {
        frame_registry: RegisteredTermFrames::new().into(),
        lua_engine: LuaState::setup().expect("Can create interpreter").into(),
    });
    install_lua_globals(&global).expect("Couldn't install Lua globals");

    html! {
        <div class="toplevel">
            <SplitPanel direction={PanelDirection::Vertical} first={ html! { <TermView terminal={TermFrame(0)} global={global.clone()}/> }}
        second={ html! { <TermView terminal={TermFrame(1)} global={global.clone()}/> } }/>
        </div>
    }
}

fn main() {
    console_error_panic_hook::set_once();

    yew::Renderer::<App>::new().render();
}