use leptos::prelude::*;
use leptos::task::spawn_local;

#[component]
pub fn Sidebar() -> impl IntoView {
    let store = use_context::<crate::store::TorrentStore>().expect("store not provided");
    let is_mobile_menu_open = use_context::<RwSignal<bool>>().expect("mobile menu state not provided");

    let total_count = move || store.torrents.with(|map| map.len());
    let downloading_count = move || {
        store.torrents.with(|map| {
            map.values()
                .filter(|t| t.status == shared::TorrentStatus::Downloading)
                .count()
        })
    };
    let seeding_count = move || {
        store.torrents.with(|map| {
            map.values()
                .filter(|t| t.status == shared::TorrentStatus::Seeding)
                .count()
        })
    };
    let completed_count = move || {
        store.torrents.with(|map| {
            map.values()
                .filter(|t| {
                    t.status == shared::TorrentStatus::Seeding
                        || (t.status == shared::TorrentStatus::Paused && t.percent_complete >= 100.0)
                })
                .count()
        })
    };
    let paused_count = move || {
        store.torrents.with(|map| {
            map.values()
                .filter(|t| t.status == shared::TorrentStatus::Paused)
                .count()
        })
    };
    let inactive_count = move || {
        store.torrents.with(|map| {
            map.values()
                .filter(|t| {
                    t.status == shared::TorrentStatus::Paused
                        || t.status == shared::TorrentStatus::Error
                })
                .count()
        })
    };

    let set_filter = move |f: crate::store::FilterStatus| {
        store.filter.set(f);
        is_mobile_menu_open.set(false);
    };

    let is_active = move |f: crate::store::FilterStatus| store.filter.get() == f;

    let username = move || {
        store.user.get().unwrap_or_else(|| "User".to_string())
    };

    let first_letter = move || {
        username().chars().next().unwrap_or('?').to_uppercase().to_string()
    };

    view! {
        <div class="w-full h-full flex flex-col bg-card" style="padding-top: env(safe-area-inset-top);">
            <div class="p-4 flex-1 overflow-y-auto">
                <div class="mb-4 px-2 text-lg font-semibold tracking-tight text-foreground">
                    "VibeTorrent"
                </div>
                <div class="space-y-1">
                    <h4 class="mb-1 rounded-md px-2 py-1 text-sm font-semibold text-muted-foreground">"Filters"</h4>
                    
                    <SidebarButton
                        active=Signal::derive(move || is_active(crate::store::FilterStatus::All))
                        on_click=move |_| set_filter(crate::store::FilterStatus::All)
                        icon="M3.75 6.75h16.5M3.75 12h16.5m-16.5 5.25h16.5"
                        label="All"
                        count=Signal::derive(total_count)
                    />
                    <SidebarButton
                        active=Signal::derive(move || is_active(crate::store::FilterStatus::Downloading))
                        on_click=move |_| set_filter(crate::store::FilterStatus::Downloading)
                        icon="M3 16.5v2.25A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75V16.5M16.5 12L12 16.5m0 0L7.5 12m4.5 4.5V3"
                        label="Downloading"
                        count=Signal::derive(downloading_count)
                    />
                    <SidebarButton
                        active=Signal::derive(move || is_active(crate::store::FilterStatus::Seeding))
                        on_click=move |_| set_filter(crate::store::FilterStatus::Seeding)
                        icon="M3 16.5v2.25A2.25 2.25 0 005.25 21h13.5A2.25 2.25 0 0021 18.75V16.5m-13.5-9L12 3m0 0l4.5 4.5M12 3v13.5"
                        label="Seeding"
                        count=Signal::derive(seeding_count)
                    />
                    <SidebarButton
                        active=Signal::derive(move || is_active(crate::store::FilterStatus::Completed))
                        on_click=move |_| set_filter(crate::store::FilterStatus::Completed)
                        icon="M9 12.75L11.25 15 15 9.75M21 12a9 9 0 11-18 0 9 9 0 0118 0z"
                        label="Completed"
                        count=Signal::derive(completed_count)
                    />
                    <SidebarButton
                        active=Signal::derive(move || is_active(crate::store::FilterStatus::Paused))
                        on_click=move |_| set_filter(crate::store::FilterStatus::Paused)
                        icon="M15.75 5.25v13.5m-7.5-13.5v13.5"
                        label="Paused"
                        count=Signal::derive(paused_count)
                    />
                    <SidebarButton
                        active=Signal::derive(move || is_active(crate::store::FilterStatus::Inactive))
                        on_click=move |_| set_filter(crate::store::FilterStatus::Inactive)
                        icon="M18.364 18.364A9 9 0 005.636 5.636m12.728 12.728A9 9 0 015.636 5.636m12.728 12.728L5.636 5.636"
                        label="Inactive"
                        count=Signal::derive(inactive_count)
                    />
                </div>
            </div>

            // Separator
            <div class="border-t border-border" />

            <div class="p-4 bg-card" style="padding-bottom: calc(1rem + env(safe-area-inset-bottom));">
                <div class="flex items-center gap-3">
                    // Avatar
                    <div class="h-8 w-8 rounded-full bg-primary text-primary-foreground flex items-center justify-center text-xs font-medium shrink-0">
                        {first_letter}
                    </div>
                    <div class="flex-1 overflow-hidden">
                        <div class="font-medium text-sm truncate text-foreground">{username}</div>
                        <div class="text-[10px] text-muted-foreground truncate">"Online"</div>
                    </div>

                    // Theme toggle button
                    <div class="inline-flex items-center justify-center size-8 rounded-md hover:bg-accent hover:text-accent-foreground text-muted-foreground hover:text-foreground transition-colors">
                        <crate::components::ui::theme_toggle::ThemeToggle />
                    </div>
                    // Logout button
                    <button
                        class="inline-flex items-center justify-center size-8 rounded-md hover:bg-accent text-destructive transition-colors"
                        on:click=move |_| {
                            spawn_local(async move {
                                if shared::server_fns::auth::logout().await.is_ok() {
                                    let window = web_sys::window().expect("window should exist");
                                    let _ = window.location().set_href("/login");
                                }
                            });
                        }
                    >
                        <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-4 h-4">
                            <path stroke-linecap="round" stroke-linejoin="round" d="M15.75 9V5.25A2.25 2.25 0 0013.5 3h-6a2.25 2.25 0 00-2.25 2.25v13.5A2.25 2.25 0 007.5 21h6a2.25 2.25 0 002.25-2.25V15M12 9l-3 3m0 0l3 3m-3-3h12.75" />
                        </svg>
                    </button>
                </div>
            </div>
        </div>
    }
}

#[component]
fn SidebarButton(
    active: Signal<bool>,
    on_click: impl Fn(web_sys::MouseEvent) + 'static,
    #[prop(into)] icon: String,
    #[prop(into)] label: &'static str,
    count: Signal<usize>,
) -> impl IntoView {
    view! {
        <button
            class=move || if active.get() {
                "inline-flex items-center justify-start gap-2 w-full h-8 rounded-md px-3 text-sm font-medium bg-secondary text-secondary-foreground transition-colors"
            } else {
                "inline-flex items-center justify-start gap-2 w-full h-8 rounded-md px-3 text-sm font-medium hover:bg-accent hover:text-accent-foreground transition-colors"
            }
            on:click=on_click
        >
            <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-4 h-4">
                <path stroke-linecap="round" stroke-linejoin="round" d=icon.clone() />
            </svg>
            {label}
            <span class="ml-auto text-xs font-mono opacity-70">{count}</span>
        </button>
    }
}