use std::ops::Deref;

use anyhow::anyhow;
use lan_party_core::{
    components::Block,
    edit::IntoEdit,
    event::{Event, EventOutcome, EventSpec, EventUpdate},
    util::WithContext,
    view::IntoView,
};
use log::debug;
use reqwasm::http::Method;
use sycamore::{futures::spawn_local_scoped, prelude::*};

use crate::{
    components::{messages::Messenger, Button, Modal, Table},
    state::{EventsExt, UsersExt},
    util::api_request,
};
use lan_party_core::state::{Events, Users};

pub enum Msg {
    Reload,
    Add(EventSpec),
    Update(String, EventUpdate),
    Delete(String),
    Stop(String),
    ViewOutcome(String),
}

#[component]
pub fn EventsPage<'a, G: Html>(cx: Scope<'a>) -> View<G> {
    let messenger = use_context::<Messenger>(cx);

    let event_spec = create_signal(cx, EventSpec::default());
    let event_update = create_signal(cx, EventUpdate::default());
    let event_update_name = create_signal(cx, WithContext::<Events, String>::from(String::new()));

    let current_event = create_signal(cx, String::new());
    let show_outcome = create_signal(cx, false);
    let event_outcome = create_signal(cx, EventOutcome::default());

    let events = use_context::<Events>(cx);
    let users = use_context::<Users>(cx);

    let dispatch = move |msg: Msg| {
        spawn_local_scoped(cx, async move {
            match msg {
                Msg::Add(event_spec) => {
                    let name = event_spec.name.clone();
                    messenger.add_result(
                        events.add(event_spec).await,
                        Some(format!("Created a new event with name \"{}\"", name)),
                        Some("Error when adding an event"),
                    );
                }
                Msg::Reload => messenger.add_result(
                    events.load().await,
                    Option::<String>::None,
                    Some("Failed to load events"),
                ),
                Msg::Update(event_update_name, event_update) => {
                    messenger.add_result(
                        events.update_event(&event_update_name, event_update).await,
                        Some(format!("Updated event with name \"{}\"", event_update_name)),
                        Some("Error when updating event"),
                    );
                }
                Msg::Delete(event_name) => {
                    messenger.add_result(
                        events.delete(&event_name).await,
                        Some(format!("Deleted event with name \"{}\"", event_name)),
                        Some("Error when deleting event"),
                    );
                }
                Msg::ViewOutcome(event_name) => {
                    show_outcome.set(true);
                    current_event.set(event_name.clone());
                    let res = api_request::<(), EventOutcome>(
                        Method::GET,
                        &format!("/event/{}/outcome", event_name),
                        None,
                    )
                    .await
                    .and_then(|inner| inner.ok_or(anyhow!("missing body")));

                    if let Ok(outcome) = res {
                        event_outcome.set(outcome);
                    } else {
                        messenger.add_result(
                            res,
                            Option::<String>::None,
                            Some("Failed to load outcome"),
                        )
                    }
                }
                Msg::Stop(event_name) => {
                    let res = api_request::<(), EventOutcome>(
                        Method::POST,
                        &format!("/event/{}/stop", event_name),
                        None,
                    )
                    .await;

                    messenger.add_result(
                        res,
                        Some("Event finished, scores were applied"),
                        Some("Unable to finish event"),
                    );

                    let _ = users.load();
                }
            }
        });
    };

    dispatch(Msg::Reload);

    let outcome_points = create_memo(cx, || {
        let cloned = event_outcome.get().as_ref().clone();
        let mut vec = cloned.points.into_iter().collect::<Vec<_>>();
        vec.sort_by_key(|(_, s)| -*s);
        vec
    });

    view! { cx,
        Modal(open=show_outcome, title="Event outcome".into()) {
            Table(headers=vec!["Username".into(), "Score".into()]) {
                Indexed(
                    iterable=&outcome_points,
                    view=move |cx, (k, v)| {
                        view! { cx,
                            tr {
                                td { (*k.clone()) }
                                td { (v.clone()) }
                            }
                        }
                    }
                )
            }
            Button(text="Reload".into(), icon="mdi-refresh".into(), onclick=move |_| dispatch(Msg::ViewOutcome(current_event.get().as_ref().clone())))
        }
        div(class="events-cols") {
            div {
                Block(title="Events".into()) {
                    Button(text="Reload".into(), icon="mdi-refresh".into(), onclick=move |_| dispatch(Msg::Reload))
                    Indexed(
                        iterable=&events.get(),
                        view=move |cx, event| {
                            let event = create_ref(cx, event);
                            view! { cx,
                                Block(title=event.name.clone()) {
                                    (event.description)
                                    br()
                                    span(class="event-action") {
                                        Button(text="Delete".into(), icon="mdi-delete".into(), onclick=move |_| dispatch(Msg::Delete(event.name.clone())))
                                    }
                                    span(class="event-action") {
                                        Button(text="View outcome".into(), onclick=move |_| dispatch(Msg::ViewOutcome(event.name.clone())))
                                    }
                                    span(class="event-action") {
                                        Button(text="Finish".into(), onclick=move |_| dispatch(Msg::Stop(event.name.clone())))
                                    }
                                    br()
                                    (event.event_type.view(cx))
                                }
                                br()
                            }
                        },
                    )
                }
            }
            div(class="events-right") {
                Block(title="Create new event".into()) {
                    (event_spec.edit(cx))
                    Button(icon="mdi-check".into(), onclick=move |_| dispatch(Msg::Add(event_spec.get().as_ref().clone())))
                }
                br()
                Block(title="Update an event".into()) {
                    label { "Event name" }
                    (event_update_name.edit(cx))
                    (event_update.edit(cx))
                    Button(
                        icon="mdi-check".into(),
                        onclick=move |_| dispatch(Msg::Update(
                            event_update_name.get().as_ref().deref().clone(),
                            event_update.get().as_ref().clone()
                        ))
                    )
                }
            }
        }
    }
}