use chrono::{NaiveDateTime, TimeZone};
use model::{AccessTokenString, RefreshTokenString};
use seed::prelude::*;

use crate::pages::AdminPage;
use crate::shared::notification::NotificationMsg;
use crate::{pages, Model, Msg, Page, PublicPage};

#[derive(Debug)]
pub enum SessionMsg {
    SessionReceived {
        access_token: AccessTokenString,
        refresh_token: RefreshTokenString,
        exp: NaiveDateTime,
    },
    SessionExpired,
    RefreshToken(RefreshTokenString),
    TokenRefreshed(crate::api::NetRes<model::api::SessionOutput>),
    CheckSession,
}

pub fn init(model: &mut Model, orders: &mut impl Orders<Msg>) {
    orders.stream(streams::interval(500, || {
        Msg::Session(SessionMsg::CheckSession)
    }));
    model.shared.access_token = LocalStorage::get::<_, String>("at")
        .ok()
        .map(model::AccessTokenString::new);
    model.shared.refresh_token = LocalStorage::get::<_, String>("rt")
        .ok()
        .map(model::RefreshTokenString::new);
    model.shared.exp = LocalStorage::get::<_, String>("exp").ok().and_then(|s| {
        chrono::DateTime::parse_from_rfc3339(&s)
            .ok()
            .map(|t| t.naive_utc())
    });
    redirect_on_session(model, orders);
}

pub fn redirect_on_session(model: &Model, orders: &mut impl Orders<Msg>) {
    seed::log!(&model.page, model.shared.me.is_some());
    match &model.page {
        Page::Admin(admin) => match admin {
            AdminPage::Landing => {}
            AdminPage::Dashboard => {}
            AdminPage::Products => {}
            AdminPage::Product => {}
        },
        Page::Public(public) if model.shared.me.is_some() => match public {
            PublicPage::SignUp(_) | PublicPage::SignIn(_) => {
                let url = model.url.clone().set_path(&[] as &[&str]);
                url.go_and_push();
                orders.send_msg(crate::Msg::UrlChanged(subs::UrlChanged(url)));
                orders.force_render_now();
            }
            _ => {}
        },
        Page::Public(public) => match public {
            PublicPage::Listing(_) => {}
            PublicPage::Product(_) => {}
            PublicPage::SignIn(_) => {}
            PublicPage::SignUp(_) => {}
            PublicPage::ShoppingCart => {}
            PublicPage::Checkout => {}
        },
    }
}

pub fn update(msg: SessionMsg, model: &mut Model, orders: &mut impl Orders<Msg>) {
    match msg {
        SessionMsg::SessionReceived {
            access_token,
            refresh_token,
            exp,
        } => {
            LocalStorage::insert("at", access_token.as_str()).ok();
            LocalStorage::insert("rt", refresh_token.as_str()).ok();
            let encoded = {
                let l: chrono::DateTime<chrono::Local> =
                    chrono::Local.from_local_datetime(&exp).unwrap();
                l.to_rfc3339()
            };
            LocalStorage::insert("exp", &encoded).ok();

            model.shared.access_token = Some(access_token);
            model.shared.refresh_token = Some(refresh_token);
            model.shared.exp = Some(exp);
        }
        SessionMsg::SessionExpired => {
            LocalStorage::remove("at").ok();
            LocalStorage::remove("rt").ok();
            LocalStorage::remove("exp").ok();

            orders.force_render_now();
        }
        SessionMsg::CheckSession => {
            orders.skip();
            if model.shared.refresh_token.is_none() {
                return;
            }
            if let Some(exp) = model.shared.exp {
                if exp > chrono::Utc::now().naive_utc() - chrono::Duration::seconds(1) {
                    return;
                }
                if let Some(token) = model.shared.refresh_token.take() {
                    orders
                        .skip()
                        .send_msg(Msg::Session(SessionMsg::RefreshToken(token)));
                }
            }
        }
        SessionMsg::RefreshToken(token) => {
            orders.skip().perform_cmd(async {
                Msg::Session(SessionMsg::TokenRefreshed(
                    crate::api::public::refresh_token(token).await,
                ))
            });
        }
        SessionMsg::TokenRefreshed(crate::api::NetRes::Success(model::api::SessionOutput {
            access_token,
            refresh_token,
            exp,
        })) => {
            orders
                .skip()
                .send_msg(Msg::Session(SessionMsg::SessionReceived {
                    access_token,
                    refresh_token,
                    exp,
                }));
        }
        SessionMsg::TokenRefreshed(crate::api::NetRes::Error(model::api::Failure { errors })) => {
            errors.into_iter().for_each(|msg| {
                orders
                    .skip()
                    .send_msg(Msg::Shared(crate::shared::SharedMsg::Notification(
                        NotificationMsg::Error(msg),
                    )));
            });
        }
        SessionMsg::TokenRefreshed(crate::api::NetRes::Http(e)) => match e {
            FetchError::JsonError(json) => {
                seed::error!("invalid data in response", json);
            }
            FetchError::DomException(dom) => {
                seed::error!("dom", dom);
            }
            FetchError::PromiseError(res) => {
                seed::error!("promise", res);
            }
            FetchError::NetworkError(net) => {
                seed::error!("net", net);
            }
            FetchError::RequestError(e) => {
                seed::error!(e);
            }
            FetchError::StatusError(status) => match status.code {
                401 | 403 => {
                    orders
                        .skip()
                        .send_msg(Msg::Session(SessionMsg::SessionExpired));
                }
                _ => {
                    orders
                        .skip()
                        .send_msg(Msg::Shared(crate::shared::SharedMsg::Notification(
                            NotificationMsg::Error("Request failed".into()),
                        )));
                }
            },
        },
    }
}