//! Admin UI (milestone 7): user management and server settings.
//! Rendered as full views from the shell's "manage" section.

use crate::i18n;
use crate::util::select_value;
use leptos::prelude::*;
use wasm_bindgen::JsCast;
use wasm_bindgen_futures::spawn_local;

use crate::api::{self, AdminUser, Me, Mode};
use crate::components::icon::Icon;
use crate::components::modal::Modal;
use crate::components::toast::{ToastMsg, show, show_error};
use crate::icons::IconName;
use crate::views::dialogs::{Dialog, admin_root};

// ---------------------------------------------------------------------------
// Settings view
// ---------------------------------------------------------------------------

/// The two settings tabs. Every user sees Profile; Server is admin-only.
#[derive(Clone, Copy, PartialEq)]
enum SettingsTab {
    Profile,
    Server,
}

impl SettingsTab {
    const KEY: &'static str = "fbng.settings-tab";

    fn load(is_admin: bool) -> Self {
        match crate::util::storage_get(Self::KEY).as_deref() {
            Some("server") if is_admin => SettingsTab::Server,
            Some("profile") => SettingsTab::Profile,
            // First visit: admins land on the server tab (the pre-existing
            // default), everyone else on their profile.
            _ if is_admin => SettingsTab::Server,
            _ => SettingsTab::Profile,
        }
    }

    fn save(self) {
        crate::util::storage_set(
            Self::KEY,
            match self {
                SettingsTab::Server => "server",
                SettingsTab::Profile => "profile",
            },
        );
    }
}

/// One labelled checkbox row for a setting.
///
/// The save button belongs to the tab, not the row. The server tab writes
/// all of its settings in one PUT, so a per-row button would save the other
/// rows' unsaved state too.
#[component]
fn SettingToggle(
    label: &'static str,
    desc: &'static str,
    value: ReadSignal<Option<bool>>,
    set_value: WriteSignal<Option<bool>>,
) -> impl IntoView {
    view! {
        {move || match value.get() {
            None => view! {
                <p class="muted">{i18n::tr(i18n::k::LOADING)}</p>
            }
            .into_view()
            .into_any(),
            Some(v) => view! {
                <label class="setting-row">
                    <span>
                        <span class="setting-label">{label}</span>
                        <span class="setting-desc">{desc}</span>
                    </span>
                    <input
                        type="checkbox"
                        checked=v
                        on:change=move |ev: web_sys::Event| {
                            if let Some(t) = ev
                                .target()
                                .and_then(|t| t.dyn_into::<web_sys::HtmlInputElement>().ok())
                            {
                                set_value.set(Some(t.checked()));
                            }
                        }
                    />
                </label>
            }
            .into_view()
            .into_any(),
        }}
    }
}

#[component]
pub fn SettingsView(
    me: ReadSignal<Option<Me>>,
    set_me: WriteSignal<Option<Me>>,
    /// The folder picker for the search exclusions is rendered at the shell
    /// level, like every other dialog.
    set_dialog: WriteSignal<Option<Dialog>>,
) -> impl IntoView {
    let toast = use_context::<ToastMsg>().expect("toast context");
    let is_admin = move || me.get().and_then(|m| m.user).is_some_and(|u| u.is_admin);
    // The shell re-creates this view when /me changes (saving resets it), so
    // the active tab is remembered in localStorage like the view mode.
    let (tab, set_tab) = signal(SettingsTab::load(is_admin()));
    let pick_tab = move |t: SettingsTab| {
        t.save();
        set_tab.set(t);
    };

    // --- profile: single-click-to-open ------------------------------------
    let (single_click, set_single_click) = signal(Option::<bool>::None);
    let (profile_busy, set_profile_busy) = signal(false);
    // Profile language: Some(None) = auto (follow the browser).
    let (language, set_language) = signal(Option::<Option<String>>::None);
    let (thumbnails, set_thumbnails) = signal(Option::<bool>::None);
    // Default root: Some(None) = the folder overview.
    let (default_root, set_default_root) = signal(Option::<Option<i64>>::None);
    // Without `--cache` the server cannot make thumbnails, so hide the row
    // rather than offer a setting that does nothing.
    let thumbs_available = move || me.get().is_some_and(|m| m.thumbnails_available);
    Effect::new(move |_| {
        if let Some(u) = me.get().and_then(|m| m.user) {
            set_single_click.set(Some(u.single_click_open));
            set_thumbnails.set(Some(u.thumbnails));
            set_language.set(Some(u.language.clone()));
            set_default_root.set(Some(u.default_root_id));
        }
    });
    // Saves both profile settings in one call.
    let save_profile = Callback::new(move |_| {
        if profile_busy.get() {
            return;
        }
        let Some(v) = single_click.get() else { return };
        let Some(th) = thumbnails.get() else { return };
        let Some(lang) = language.get() else { return };
        let Some(root) = default_root.get() else {
            return;
        };
        set_profile_busy.set(true);
        let toast2 = toast;
        let set_me2 = set_me;
        let set_val = set_single_click;
        let set_th = set_thumbnails;
        let set_lang = set_language;
        let set_root = set_default_root;
        spawn_local(async move {
            match api::update_profile(Some(v), Some(th), Some(lang.clone()), Some(root)).await {
                Ok(m) => {
                    show(toast2, i18n::t(i18n::k::PROFILE_SAVED).to_string());
                    // The response already carries the fresh /me (which also
                    // flips the UI language via the app-level effect).
                    set_me2.set(Some(m));
                    set_val.set(Some(v));
                    set_th.set(Some(th));
                    set_lang.set(Some(lang));
                    set_root.set(Some(root));
                }
                Err(e) => show(
                    toast2,
                    i18n::t_fmt(i18n::k::PROFILE_SAVE_ERR, &e.to_string()),
                ),
            }
            set_profile_busy.set(false);
        });
    });

    // --- server settings (admin only) --------------------------------------
    let (value, set_value) = signal(Option::<bool>::None);
    let (excludes, set_excludes) = signal(Vec::<String>::new());
    let (excl_error, set_excl_error) = signal(Option::<String>::None);
    let (busy, set_busy) = signal(false);
    {
        let set = set_value;
        let set_ex = set_excludes;
        let toast2 = toast;
        spawn_local(async move {
            // Non-admins don't have a Server tab; don't even probe the
            // endpoint (it would 403 and toast).
            if !is_admin() {
                return;
            }
            match api::get_admin_settings().await {
                Ok(s) => {
                    set.set(Some(s.allow_writable_shares));
                    set_ex.set(s.search_excludes);
                }
                Err(e) => show_error(toast2, e.to_string()),
            }
        });
    }
    // Opens the same folder picker the user editor uses, over the whole
    // server root (an exclusion is not tied to any one user's folders).
    let add_exclude = move |_| {
        set_excl_error.set(None);
        set_dialog.set(Some(Dialog::Picker {
            title: i18n::t(i18n::k::EXCLUDE_FOLDER).to_string(),
            confirm: i18n::t(i18n::k::EXCLUDE_HERE).to_string(),
            roots: vec![admin_root()],
            root: api_types::ADMIN_ROOT,
            dir: String::new(),
            for_write: false,
            on_pick: Callback::new(move |(_, dir): (i64, String)| {
                // An empty dir is the server root. Excluding it would
                // switch search off altogether.
                if dir.is_empty() {
                    set_excl_error.set(Some(i18n::t(i18n::k::EXCLUDE_ROOT_ERR).to_string()));
                    return;
                }
                let mut v = excludes.get();
                if v.contains(&dir) {
                    set_excl_error.set(Some(i18n::t(i18n::k::EXCLUDE_DUP_ERR).to_string()));
                    return;
                }
                v.push(dir);
                set_excludes.set(v);
                set_excl_error.set(None);
            }),
        }));
    };
    let save = move |_| {
        if busy.get() {
            return;
        }
        let Some(v) = value.get() else { return };
        let ex = excludes.get();
        set_busy.set(true);
        let toast2 = toast;
        let set_me2 = set_me;
        spawn_local(async move {
            match api::update_admin_settings(v, ex).await {
                Ok(_) => {
                    show(toast2, i18n::t(i18n::k::SETTINGS_SAVED).to_string());
                    // Re-fetch this session's /me so the share dialog (and
                    // anything else) sees the new setting without a reload.
                    if let Ok(m) = api::me().await {
                        set_me2.set(Some(m));
                    }
                }
                Err(e) => show(
                    toast2,
                    i18n::t_fmt(i18n::k::SETTINGS_SAVE_ERR, &e.to_string()),
                ),
            }
            set_busy.set(false);
        });
    };

    view! {
        <div class="admin-view">
            <div class="settings-tabs">
                <button
                    class="settings-tab-btn"
                    class:active=move || tab.get() == SettingsTab::Profile
                    on:click=move |_| pick_tab(SettingsTab::Profile)
                >
                    {i18n::tr(i18n::k::PROFILE)}
                </button>
                <Show when=move || is_admin()>
                    <button
                        class="settings-tab-btn"
                        class:active=move || tab.get() == SettingsTab::Server
                        on:click=move |_| pick_tab(SettingsTab::Server)
                    >
                        {i18n::tr(i18n::k::SERVER)}
                    </button>
                </Show>
            </div>
            <Show when=move || tab.get() == SettingsTab::Profile>
                {move || match (single_click.get(), language.get(), default_root.get()) {
                    (Some(sc), Some(lang), Some(root)) => {
                        let lang_val = lang.clone().unwrap_or_default();
                        let roots = me.get().map(|m| m.roots).unwrap_or_default();
                        view! {
                            <label class="setting-row">
                                <span>
                                    <span class="setting-label">{i18n::t(i18n::k::SINGLE_CLICK_LABEL)}</span>
                                    <span class="setting-desc">{i18n::t(i18n::k::SINGLE_CLICK_DESC)}</span>
                                </span>
                                <input
                                    type="checkbox"
                                    checked=sc
                                    on:change=move |ev: web_sys::Event| {
                                        if let Some(t) = ev
                                            .target()
                                            .and_then(|t| t.dyn_into::<web_sys::HtmlInputElement>().ok())
                                        {
                                            set_single_click.set(Some(t.checked()));
                                        }
                                    }
                                />
                            </label>
                            <Show when=thumbs_available>
                                <label class="setting-row">
                                    <span>
                                        <span class="setting-label">{i18n::t(i18n::k::THUMBNAILS_LABEL)}</span>
                                        <span class="setting-desc">{i18n::t(i18n::k::THUMBNAILS_DESC)}</span>
                                    </span>
                                    <input
                                        type="checkbox"
                                        checked=move || thumbnails.get().unwrap_or(false)
                                        on:change=move |ev: web_sys::Event| {
                                            if let Some(t) = ev
                                                .target()
                                                .and_then(|t| t.dyn_into::<web_sys::HtmlInputElement>().ok())
                                            {
                                                set_thumbnails.set(Some(t.checked()));
                                            }
                                        }
                                    />
                                </label>
                            </Show>
                            <div class="setting-row setting-row-select">
                                <span>
                                    <span class="setting-label">{i18n::t(i18n::k::LANGUAGE)}</span>
                                    <span class="setting-desc">{i18n::t(i18n::k::LANGUAGE_DESC)}</span>
                                </span>
                                <select
                                    on:change=move |ev: web_sys::Event| {
                                        let Some(tag) = select_value(&ev) else {
                                            return;
                                        };
                                        set_language.set(Some(if tag.is_empty() {
                                            None
                                        } else {
                                            Some(tag)
                                        }));
                                    }
                                >
                                    <option value="" selected=lang_val.is_empty()>{i18n::t(i18n::k::LANG_AUTO)}</option>
                                    <option value="en" selected=lang_val == "en">{i18n::t(i18n::k::LANG_EN)}</option>
                                    <option value="de" selected=lang_val == "de">{i18n::t(i18n::k::LANG_DE)}</option>
                                    <option value="fr" selected=lang_val == "fr">{i18n::t(i18n::k::LANG_FR)}</option>
                                </select>
                            </div>
                            <div class="setting-row setting-row-select">
                                <span>
                                    <span class="setting-label">{i18n::t(i18n::k::DEFAULT_ROOT_LABEL)}</span>
                                    <span class="setting-desc">{i18n::t(i18n::k::DEFAULT_ROOT_DESC)}</span>
                                </span>
                                <select
                                    on:change=move |ev: web_sys::Event| {
                                        let Some(v) = select_value(&ev) else {
                                            return;
                                        };
                                        set_default_root.set(Some(v.parse().ok()));
                                    }
                                >
                                    <option value="" selected=root.is_none()>{i18n::t(i18n::k::DEFAULT_ROOT_NONE)}</option>
                                    {roots.iter().map(|r| {
                                        let id = r.id;
                                        view! {
                                            <option value=id.to_string() selected=root == Some(id)>{r.name.clone()}</option>
                                        }
                                    }).collect::<Vec<_>>()}
                                </select>
                            </div>
                            <div class="modal-actions">
                                <button
                                    class="btn btn-primary"
                                    disabled=move || profile_busy.get()
                                    on:click=move |_| save_profile.run(())
                                >
                                    {move || if profile_busy.get() {
                                        i18n::t(i18n::k::SAVING).to_string()
                                    } else {
                                        i18n::t(i18n::k::SAVE_PROFILE).to_string()
                                    }}
                                </button>
                            </div>
                        }
                        .into_view()
                        .into_any()
                    }
                    _ => view! {
                        <p class="muted">{i18n::tr(i18n::k::LOADING)}</p>
                    }
                    .into_view()
                    .into_any(),
                }}
            </Show>
            <Show when=move || tab.get() == SettingsTab::Server && is_admin()>
                <SettingToggle
                    label=i18n::t(i18n::k::ALLOW_RW_SHARES)
                    desc=i18n::t(i18n::k::ALLOW_RW_SHARES_DESC)
                    value=value
                    set_value=set_value
                />
                <div class="excludes-field">
                    <span class="setting-label">{i18n::tr(i18n::k::SEARCH_EXCLUDES)}</span>
                    <div class="excludes-list">
                        {move || {
                            let list = excludes.get();
                            if list.is_empty() {
                                return view! {
                                    <p class="muted excludes-empty">
                                        {i18n::tr(i18n::k::SEARCH_EXCLUDES_EMPTY)}
                                    </p>
                                }
                                .into_view()
                                .into_any();
                            }
                            list.iter()
                                .enumerate()
                                .map(|(i, path)| {
                                    view! {
                                        <div class="exclude-row">
                                            <Icon name=IconName::Folder class="ic-row".to_string()/>
                                            <span class="exclude-path">{path.clone()}</span>
                                            <button
                                                class="icon-btn exclude-remove"
                                                title=i18n::t(i18n::k::REMOVE_FOLDER)
                                                aria-label=i18n::t(i18n::k::REMOVE_FOLDER)
                                                on:click=move |_| {
                                                    let mut v = excludes.get();
                                                    if i < v.len() {
                                                        v.remove(i);
                                                    }
                                                    set_excludes.set(v);
                                                    set_excl_error.set(None);
                                                }
                                            >
                                                <Icon name=IconName::Close class="ic-btn".to_string()/>
                                            </button>
                                        </div>
                                    }
                                })
                                .collect::<Vec<_>>()
                                .into_view()
                                .into_any()
                        }}
                    </div>
                    <button class="btn btn-sm exclude-add" on:click=add_exclude>
                        <Icon name=IconName::Add class="ic-btn".to_string()/>
                        {i18n::tr(i18n::k::EXCLUDE_FOLDER)}
                    </button>
                    {move || {
                        let Some(e) = excl_error.get() else {
                            return view! {}.into_any();
                        };
                        view! { <p class="dialog-error">{e}</p> }.into_view().into_any()
                    }}
                </div>
                <div class="modal-actions">
                    <button
                        class="btn btn-primary"
                        disabled=move || busy.get() || value.get().is_none()
                        on:click=move |_| save(())
                    >
                        {move || if busy.get() {
                            i18n::t(i18n::k::SAVING).to_string()
                        } else {
                            i18n::t(i18n::k::SAVE_SETTINGS).to_string()
                        }}
                    </button>
                </div>
            </Show>
        </div>
    }
}

// ---------------------------------------------------------------------------
// Users view
// ---------------------------------------------------------------------------

/// What the user form is editing: a brand-new user, or an existing one.
#[derive(Clone)]
enum Editing {
    New,
    Edit(AdminUser),
}

#[component]
pub fn UsersView(
    me: ReadSignal<Option<Me>>,
    set_me: WriteSignal<Option<Me>>,
    set_dialog: WriteSignal<Option<Dialog>>,
) -> impl IntoView {
    let toast = use_context::<ToastMsg>().expect("toast context");
    let (users, set_users) = signal(Option::<Vec<AdminUser>>::None);
    let (editing, set_editing) = signal(Option::<Editing>::None);

    let self_id = move || me.get().and_then(|m| m.user).map(|u| u.id);

    let reload = move || {
        let set = set_users;
        let toast2 = toast;
        spawn_local(async move {
            match api::list_admin_users().await {
                Ok(u) => set.set(Some(u)),
                Err(e) => show_error(toast2, e.to_string()),
            }
        });
    };
    reload();

    // After a save: reload the list, and — if the saved user is the current
    // one — refresh /me so the sidebar's folders update in place.
    let on_saved = Callback::new(move |saved: Option<i64>| {
        reload();
        if saved.is_some_and(|id| self_id() == Some(id)) {
            crate::views::shell::refresh_me(set_me, toast);
        }
    });

    let delete = move |u: AdminUser| {
        let is_self = self_id() == Some(u.id);
        if is_self {
            return;
        }
        let Some(win) = web_sys::window() else { return };
        let ok = win
            .confirm_with_message(&i18n::t_fmt(i18n::k::DELETE_USER_CONFIRM, &u.name))
            .unwrap_or(false);
        if !ok {
            return;
        }
        let id = u.id;
        let read = users;
        let write = set_users;
        let toast2 = toast;
        spawn_local(async move {
            if api::delete_admin_user(id).await.is_ok() {
                if let Some(mut cur) = read.get() {
                    cur.retain(|x| x.id != id);
                    write.set(Some(cur));
                }
            } else {
                show_error(toast2, i18n::t(i18n::k::USER_DELETE_ERR).to_string());
            }
        });
    };

    view! {
        <div class="users-tab">
            <div class="users-header">
                <h3 class="admin-section-title">{i18n::tr(i18n::k::USERS)}</h3>
                <button class="btn btn-primary" on:click=move |_| set_editing.set(Some(Editing::New))>
                    <Icon name=IconName::Add class="ic-btn".to_string()/>
                    {i18n::tr(i18n::k::NEW_USER)}
                </button>
            </div>
            {move || match users.get() {
                None => view! {
                    <p class="muted">{i18n::tr(i18n::k::LOADING)}</p>
                }
                .into_view()
                .into_any(),
                Some(ref list) if list.is_empty() => view! {
                    <p class="muted">{i18n::tr(i18n::k::NO_USERS)}</p>
                }
                .into_view()
                .into_any(),
                Some(ref list) => {
                    let sid = self_id();
                    let rows = list
                        .iter()
                        .map(|u| {
                            let is_self = sid == Some(u.id);
                            let is_admin = u.is_admin;
                            let u_edit = u.clone();
                            let u_del = u.clone();
                            let del = delete;
                            let set_edit = set_editing;
                            view! {
                                <div class="user-row">
                                    <div class="user-row-main">
                                        <div class="user-row-name">
                                            {move || {
                                                if is_admin {
                                                    view! { <span class="ic-admin" title="Administrator"><Icon name=IconName::Admin/></span> }
                                                        .into_view()
                                                        .into_any()
                                                } else {
                                                    view! {}.into_any()
                                                }
                                            }}
                                            {u.name.clone()}
                                            {if is_self {
                                                view! { <span class="muted">" (you)"</span> }
                                                    .into_view()
                                                    .into_any()
                                            } else {
                                                {
                                                    view! {}.into_view()
                                                }.into_any()
                                            }}
                                            {if !u.active {
                                                view! { <span class="badge badge-off">"disabled"</span> }
                                                    .into_view()
                                                    .into_any()
                                            } else {
                                                {
                                                    view! {}.into_view()
                                                }.into_any()
                                            }}
                                        </div>
                                    </div>
                                    <div class="user-row-actions">
                                        <button
                                            class="btn btn-sm"
                                            on:click=move |_| set_edit.set(Some(Editing::Edit(u_edit.clone())))
                                        >
                                            {i18n::tr(i18n::k::EDIT)}
                                        </button>
                                        <button
                                            class="btn btn-sm btn-danger"
                                            disabled=is_self
                                            title=if is_self {
                                                i18n::tr(i18n::k::CANT_DELETE_SELF)
                                            } else {
                                                i18n::tr(i18n::k::DELETE_USER)
                                            }
                                            on:click=move |_| del(u_del.clone())
                                        >
                                            {i18n::tr(i18n::k::DELETE)}
                                        </button>
                                    </div>
                                </div>
                            }
                        })
                        .collect::<Vec<_>>();
                    view! {
                        <div class="user-list">{rows}</div>
                    }
                }
                .into_view()
                .into_any(),
            }}
            {move || match editing.get() {
                Some(ref e) => {
                    let existing = match e {
                        Editing::Edit(u) => Some(u.clone()),
                        Editing::New => None,
                    };
                    let sid = self_id();
                    let set = set_editing;
                    view! {
                        <UserForm
                            existing=existing
                            self_id=sid
                            close=Callback::new(move |_| set.set(None))
                            on_saved=on_saved
                            set_dialog=set_dialog
                        />
                    }
                    .into_view()
                    .into_any()
                }
                None => {
                    view! {}.into_any()
                },
            }}
        </div>
    }
}

// ---------------------------------------------------------------------------
// User create / edit form
// ---------------------------------------------------------------------------

#[derive(Clone)]
struct RootDraft {
    path: String,
    mode: Mode,
}

#[component]
fn UserForm(
    existing: Option<AdminUser>,
    self_id: Option<i64>,
    close: Callback<()>,
    on_saved: Callback<Option<i64>>,
    set_dialog: WriteSignal<Option<Dialog>>,
) -> impl IntoView {
    let toast = use_context::<ToastMsg>().expect("toast context");
    let is_new = existing.is_none();
    let is_self = existing
        .as_ref()
        .map(|u| self_id == Some(u.id))
        .unwrap_or(false);
    let original_name = existing
        .as_ref()
        .map(|u| u.name.clone())
        .unwrap_or_default();

    let (name, set_name) = signal(
        existing
            .as_ref()
            .map(|u| u.name.clone())
            .unwrap_or_default(),
    );
    let (password, set_password) = signal(String::new());
    let (is_admin, set_is_admin) = signal(existing.as_ref().map(|u| u.is_admin).unwrap_or(false));
    let (active, set_active) = signal(existing.as_ref().map(|u| u.active).unwrap_or(true));
    let mut roots0: Vec<RootDraft> = existing
        .as_ref()
        .map(|u| {
            u.roots
                .iter()
                .map(|r| RootDraft {
                    path: r.path.clone(),
                    mode: r.mode,
                })
                .collect()
        })
        .unwrap_or_default();
    if is_new && roots0.is_empty() {
        roots0.push(RootDraft {
            path: ".".to_string(),
            mode: Mode::Rw,
        });
    }
    let (roots, set_roots) = signal(roots0);
    let (busy, set_busy) = signal(false);
    let (error, set_error) = signal(Option::<String>::None);
    let name_readonly = !is_new;

    // Pick a folder under the server root; "" (the root itself) is stored
    // as ".".
    let add_root = move |_| {
        set_dialog.set(Some(Dialog::Picker {
            title: i18n::t(i18n::k::ADD_FOLDER).to_string(),
            confirm: i18n::t(i18n::k::ADD_HERE).to_string(),
            roots: vec![admin_root()],
            root: api_types::ADMIN_ROOT,
            dir: String::new(),
            for_write: false,
            on_pick: Callback::new(move |(_, dir): (i64, String)| {
                let path = if dir.is_empty() { ".".to_string() } else { dir };
                let mut v = roots.get();
                if v.iter().any(|r| r.path == path) {
                    set_error.set(Some(i18n::t(i18n::k::ROOT_DUP_ERR).to_string()));
                    return;
                }
                v.push(RootDraft {
                    path,
                    mode: Mode::Rw,
                });
                set_roots.set(v);
                set_error.set(None);
            }),
        }));
    };

    let save = move |_| {
        if busy.get() {
            return;
        }
        let n = name.get().trim().to_string();
        let pw = password.get();
        let adm = is_admin.get();
        let act = active.get();
        let pairs: Vec<(String, Mode)> = roots
            .get()
            .iter()
            .map(|r| (r.path.clone(), r.mode))
            .collect();
        // Client-side validation.
        if n.is_empty() {
            set_error.set(Some(i18n::t(i18n::k::NAME_REQUIRED).to_string()));
            return;
        }
        if is_new && pw.len() < 8 {
            set_error.set(Some(i18n::t(i18n::k::PW_SHORT).to_string()));
            return;
        }
        if !is_new && pw.is_empty() {
            // keep password unchanged
        } else if pw.len() < 8 {
            set_error.set(Some(i18n::t(i18n::k::PW_SHORT).to_string()));
            return;
        }
        if pairs.is_empty() {
            set_error.set(Some(i18n::t(i18n::k::NEED_FOLDER).to_string()));
            return;
        }

        set_busy.set(true);
        set_error.set(None);
        let toast2 = toast;
        let on_saved2 = on_saved;
        let close2 = close;
        let existing_id = existing.as_ref().map(|u| u.id);
        spawn_local(async move {
            let result = if is_new {
                api::create_admin_user(&n, &pw, adm, &pairs).await
            } else {
                let id = existing_id.unwrap_or(0);
                let pw_opt = if pw.is_empty() {
                    None
                } else {
                    Some(pw.clone())
                };
                api::update_admin_user(id, pw_opt, Some(adm), Some(act), Some(pairs)).await
            };
            match result {
                Ok(_) => {
                    show(
                        toast2,
                        if is_new {
                            i18n::t(i18n::k::USER_CREATED).to_string()
                        } else {
                            i18n::t(i18n::k::USER_UPDATED).to_string()
                        },
                    );
                    on_saved2.run(existing_id);
                    close2.run(());
                }
                Err(e) => {
                    show_error(toast2, i18n::t_fmt(i18n::k::USER_SAVE_ERR, &e.to_string()));
                    set_busy.set(false);
                }
            }
        });
    };

    view! {
        <Modal class="user-form" on_close=close>
                <h2 class="modal-title">{move || {
                    if is_new {
                        i18n::t(i18n::k::NEW_USER).to_string()
                    } else {
                        i18n::t_fmt(i18n::k::EDIT_USER_TITLE, &original_name)
                    }
                }}</h2>
                {move || {
                    let n0 = name.get();
                    view! {
                        <label class="field">
                            <span class="field-label">{i18n::tr(i18n::k::NAME)}</span>
                            <input
                                class="field-input"
                                value=n0.clone()
                                disabled=name_readonly
                                placeholder="e.g. alice"
                                on:input=move |ev: web_sys::Event| {
                                    if let Some(t) = ev
                                        .target()
                                        .and_then(|t| t.dyn_into::<web_sys::HtmlInputElement>().ok())
                                    {
                                        set_name.set(t.value());
                                    }
                                }
                            />
                        </label>
                    }
                }}
                <label class="field">
                    <span class="field-label">
                        {if is_new {
                            i18n::t(i18n::k::PASSWORD)
                        } else {
                            i18n::t(i18n::k::NEW_PASSWORD_KEEP)
                        }}
                    </span>
                    <input
                        class="field-input"
                        type="password"
                        value=move || password.get()
                        placeholder="at least 8 characters"
                        on:input=move |ev: web_sys::Event| {
                            if let Some(t) = ev
                                .target()
                                .and_then(|t| t.dyn_into::<web_sys::HtmlInputElement>().ok())
                            {
                                set_password.set(t.value());
                            }
                        }
                    />
                </label>
                <label class="check-row">
                    <input
                        type="checkbox"
                        checked=move || is_admin.get()
                        disabled=is_self
                        on:change=move |ev: web_sys::Event| {
                            if let Some(t) = ev
                                .target()
                                .and_then(|t| t.dyn_into::<web_sys::HtmlInputElement>().ok())
                            {
                                set_is_admin.set(t.checked());
                            }
                        }
                    />
                    {i18n::tr(i18n::k::ADMINISTRATOR)}
                </label>
                {move || if !is_new {
                    view! {
                        <label class="check-row">
                            <input
                                type="checkbox"
                                checked=move || active.get()
                                disabled=is_self
                                on:change=move |ev: web_sys::Event| {
                                    if let Some(t) = ev
                                        .target()
                                        .and_then(|t| t.dyn_into::<web_sys::HtmlInputElement>().ok())
                                    {
                                        set_active.set(t.checked());
                                    }
                                }
                            />
                            {i18n::tr(i18n::k::ACTIVE_CAN_SIGNIN)}
                        </label>
                    }
                    .into_view()
                    .into_any()
                } else {
                    view! {}.into_any()
                }}
                <div class="field">
                    <span class="field-label">{i18n::tr(i18n::k::FOLDERS)}</span>
                    <p class="muted field-hint">{i18n::tr(i18n::k::FOLDERS_PATHS_HINT)}</p>
                    <div class="roots-editor">
                        {move || {
                            let set_roots_c = set_roots;
                            let roots_c = roots;
                            roots
                                .get()
                                .iter()
                                .enumerate()
                                .map(|(i, r)| {
                                    let rw_selected = r.mode == Mode::Rw;
                                    let ro_selected = r.mode == Mode::Ro;
                                    view! {
                                        <div class="root-draft">
                                            <span class="root-draft-path">{r.path.clone()}</span>
                                            <select
                                                class="root-draft-mode"
                                                on:change=move |ev: web_sys::Event| {
                                                    if let Some(t) = ev
                                                        .target()
                                                        .and_then(|t| t.dyn_into::<web_sys::HtmlSelectElement>().ok())
                                                    {
                                                        let mut v = roots_c.get();
                                                        if i < v.len()
                                                            && let Some(m) = Mode::from_wire(
                                                                &t.value(),
                                                            )
                                                        {
                                                            v[i].mode = m;
                                                        }
                                                        set_roots_c.set(v);
                                                    }
                                                }
                                            >
                                                <option value=Mode::Rw.as_str() selected=rw_selected>{i18n::t(i18n::k::MODE_RW)}</option>
                                                <option value=Mode::Ro.as_str() selected=ro_selected>{i18n::t(i18n::k::MODE_RO)}</option>
                                            </select>
                                            <button
                                                class="icon-btn icon-btn-sm"
                                                title={i18n::tr(i18n::k::REMOVE_FOLDER)}
                                                on:click=move |_| {
                                                    let mut v = roots_c.get();
                                                    if i < v.len() {
                                                        v.remove(i);
                                                    }
                                                    set_roots_c.set(v);
                                                }
                                            >
                                                <Icon name=IconName::Close class="ic-btn".to_string()/>
                                            </button>
                                        </div>
                                    }
                                })
                                .collect::<Vec<_>>()
                        }}
                        <button class="btn root-add" on:click=add_root>
                            <Icon name=IconName::Folder class="ic-btn".to_string()/>
                            {i18n::tr(i18n::k::ADD_FOLDER)}
                        </button>
                    </div>
                </div>
                {move || match error.get() {
                    Some(ref e) => view! {
                        <p class="form-error">{e.clone()}</p>
                    }
                    .into_view()
                    .into_any(),
                    None => {
                        view! {}.into_any()
                    },
                }}
                <div class="modal-actions">
                    <button class="btn" on:click=move |_| close.run(())>{i18n::tr(i18n::k::CANCEL)}</button>
                    <button
                        class="btn btn-primary"
                        disabled=move || busy.get()
                        on:click=save
                    >
                        {move || {
                            if busy.get() {
                                i18n::t(i18n::k::SAVING).to_string()
                            } else if is_new {
                                i18n::t(i18n::k::CREATE_USER).to_string()
                            } else {
                                i18n::t(i18n::k::SAVE).to_string()
                            }
                        }}
                    </button>
                </div>
        </Modal>
    }
}