#![feature(try_trait_v2)]

pub mod api;
mod i18n;
mod model;
mod pages;
pub mod session;
pub mod shared;

use seed::empty;
use seed::prelude::*;

use crate::i18n::I18n;
use crate::model::Model;
use crate::pages::{Msg, Page, PublicPage};
use crate::session::SessionMsg;

#[macro_export]
macro_rules! fetch_page {
    (public $model: expr, $page: ident, $ret: expr) => {{
        let p = match &mut $model.page {
            crate::pages::Page::Public(p) => p,
            _ => return $ret,
        };
        match p {
            crate::pages::PublicPage::$page(p) => p,
            _ => return $ret,
        }
    }};
    (public $model: expr, $page: ident) => {{
        let p = match &mut $model.page {
            crate::pages::Page::Public(p) => p,
            _ => return,
        };
        match p {
            crate::pages::PublicPage::$page(p) => p,
            _ => return,
        }
    }};
    (public page $page: expr, $page_name: ident) => {{
        let p = match $page {
            crate::pages::Page::Public(p) => p,
            _ => return,
        };
        match p {
            crate::pages::PublicPage::$page_name(p) => p,
            _ => return,
        }
    }};
    (public page $page: expr, $page_name: ident, $ret: expr) => {{
        let p = match $page {
            crate::pages::Page::Public(p) => p,
            _ => {
                *$page = $ret;
                return;
            }
        };
        match p {
            crate::pages::PublicPage::$page_name(p) => p,
            _ => {
                *$page = $ret;
                return;
            }
        }
    }};
}

fn init(url: Url, orders: &mut impl Orders<Msg>) -> Model {
    orders.subscribe(Msg::UrlChanged);

    let mut model = Model {
        url: url.clone().set_path(&[] as &[&str]),
        token: LocalStorage::get("auth-token").ok(),
        page: Page::init(url, orders),
        logo: seed::document()
            .query_selector("link[rel=icon]")
            .ok()
            .flatten()
            .and_then(|el: web_sys::Element| el.get_attribute("href")),
        shared: shared::Model::default(),
        i18n: I18n::load(),
    };

    session::init(&mut model, orders);

    model
}

fn update(msg: Msg, model: &mut Model, orders: &mut impl Orders<Msg>) {
    match msg {
        Msg::Shared(msg) => {
            shared::update(msg, &mut model.shared, orders);
        }
        Msg::UrlChanged(subs::UrlChanged(url)) => model.page.page_changed(url, orders),
        Msg::Public(pages::public::Msg::Listing(msg)) => {
            let page = fetch_page!(public model, Listing);
            pages::public::listing::update(msg, page, &mut orders.proxy(Into::into));
        }
        Msg::Public(pages::public::Msg::Product(msg)) => {
            let page = fetch_page!(public model, Product);
            pages::public::product::update(msg, page, &mut orders.proxy(Into::into))
        }
        Msg::Public(pages::public::Msg::SignIn(msg)) => {
            let page = fetch_page!(public model, SignIn);
            pages::public::sign_in::update(msg, page, &mut orders.proxy(Into::into))
        }
        Msg::Public(pages::public::Msg::SignUp(pages::public::sign_up::Msg::AccountCreated(
            res,
        ))) => {
            orders
                .skip()
                .send_msg(Msg::Session(SessionMsg::TokenRefreshed(res)));
        }
        Msg::Public(pages::public::Msg::SignUp(msg)) => {
            let page = fetch_page!(public model, SignUp);
            pages::public::sign_up::update(msg, page, &mut orders.proxy(Into::into))
        }
        Msg::Admin(_) => {}
        Msg::Session(msg) => {
            session::update(msg, model, orders);
        }
    }
}

fn view(model: &Model) -> Node<Msg> {
    match &model.page {
        Page::Public(PublicPage::Listing(page)) => pages::public::listing::view(model, page),
        Page::Public(PublicPage::Product(page)) => pages::public::product::view(model, page),
        Page::Public(PublicPage::SignIn(page)) => pages::public::sign_in::view(model, page),
        Page::Public(PublicPage::SignUp(page)) => pages::public::sign_up::view(model, page),
        _ => empty![],
    }
}

#[wasm_bindgen(start)]
pub fn start() {
    App::start("main", init, update, view);
}