//! Lobby page: login prompt, match creation and joining by code.
use wasm_bindgen_futures::spawn_local;
use sycamore::prelude::*;
use sycamore_router::navigate;

use crate::api;
use crate::model::{GameTypeInfo, User};

/// Used when the game-types fetch fails: match creation must still work.
fn fallback_game_types() -> Vec<GameTypeInfo> {
    vec![GameTypeInfo {
        id: "scopone_scientifico".to_string(),
        name: "Scopone scientifico".to_string(),
        description: String::new(),
    }]
}

#[component]
pub fn LobbyPage() -> View {
    // Outer None = still loading; Some(None) = logged out.
    let user = create_signal(Option::<Option<User>>::None);
    let error = create_signal(Option::<String>::None);
    let code = create_signal(String::new());
    let game_types = create_signal(fallback_game_types());
    let selected_game = create_signal("scopone_scientifico".to_string());

    spawn_local(async move {
        match api::me().await {
            Ok(me) => user.set(Some(me)),
            Err(e) => {
                error.set(Some(e));
                user.set(Some(None));
            }
        }
    });

    spawn_local(async move {
        match api::game_types().await {
            Ok(types) if !types.is_empty() => {
                selected_game.set(types[0].id.clone());
                game_types.set(types);
            }
            _ => {} // keep the scopone fallback
        }
    });

    let on_create = move |target: i32| {
        let game_type = selected_game.get_clone();
        spawn_local(async move {
            match api::create_game(&game_type, target).await {
                Ok(game) => navigate(&format!("/game/{}", game.id)),
                Err(e) => error.set(Some(e)),
            }
        });
    };

    let on_join = move |_| {
        let value = code.get_clone().trim().to_uppercase();
        if value.is_empty() {
            return;
        }
        spawn_local(async move {
            match api::join_game(&value).await {
                Ok(game) => navigate(&format!("/game/{}", game.id)),
                Err(e) => error.set(Some(e)),
            }
        });
    };

    view! {
        div(class="lobby") {
            h1 { "Scopone scientifico" }
            (move || error.get_clone().map(|e| view! { div(class="toast") { (e) } }))
            (move || match user.get_clone() {
                None => view! { p(class="status") { "Loading…" } },
                Some(None) => view! {
                    div(class="panel login-panel") {
                        p { "Log in with your account to play." }
                        // rel="external" opts out of the SPA router's click
                        // interception: this must be a full page navigation
                        // to the backend's OIDC login endpoint.
                        a(class="button primary", href="/auth/login", rel="external") { "Log in" }
                    }
                },
                Some(Some(me)) => view! {
                    div(class="lobby-grid") {
                        nav(class="top-nav") {
                            span(class="whoami") { "Signed in as " strong { (me.name.clone()) } }
                            a(href="/history") { "My matches" }
                            a(href="/leaderboard") { "Leaderboard" }
                            a(href="/auth/logout", rel="external") { "Log out" }
                        }
                        div(class="panel") {
                            h2 { "New match" }
                            label(r#for="game-type") { "Game" }
                            select(id="game-type", bind:value=selected_game) {
                                Keyed(
                                    list=game_types,
                                    view=|g| view! { option(value=g.id.clone()) { (g.name) } },
                                    key=|g| g.id.clone(),
                                )
                            }
                            p { "First team to reach the target score wins." }
                            div(class="target-buttons") {
                                button(class="button", on:click=move |_| on_create(11)) { "Target 11" }
                                button(class="button", on:click=move |_| on_create(16)) { "Target 16" }
                                button(class="button", on:click=move |_| on_create(21)) { "Target 21" }
                            }
                        }
                        div(class="panel") {
                            h2 { "Join with a code" }
                            div(class="join-form") {
                                input(
                                    r#type="text",
                                    placeholder="6-letter code",
                                    maxlength="6",
                                    bind:value=code,
                                )
                                button(class="button primary", on:click=on_join) { "Join" }
                            }
                        }
                    }
                },
            })
        }
    }
}