notedeck/src/app.rs

use crate::account_manager::AccountManager;
use crate::actionbar::BarResult;
use crate::app_creation::setup_cc;
use crate::app_style::user_requested_visuals_change;
use crate::draft::Drafts;
use crate::frame_history::FrameHistory;
use crate::imgcache::ImageCache;
use crate::key_storage::KeyStorageType;
use crate::note::NoteRef;
use crate::notecache::{CachedNote, NoteCache};
use crate::relay_pool_manager::RelayPoolManager;
use crate::route::Route;
use crate::thread::{DecrementResult, Threads};
use crate::timeline::{Timeline, TimelineSource, ViewFilter};
use crate::ui::note::PostAction;
use crate::ui::{self, AccountSelectionWidget, DesktopGlobalPopup};
use crate::ui::{DesktopSidePanel, RelayView, View};
use crate::Result;
use egui_nav::{Nav, NavAction};
use enostr::{ClientMessage, Keypair, RelayEvent, RelayMessage, RelayPool, SecretKey};
use std::cell::RefCell;
use std::rc::Rc;

use egui::{Context, Frame, Style};
use egui_extras::{Size, StripBuilder};

use nostrdb::{BlockType, Config, Filter, Mention, Ndb, Note, NoteKey, Transaction};

use std::collections::HashSet;
use std::hash::Hash;
use std::path::Path;
use std::time::Duration;
use tracing::{debug, error, info, trace, warn};

#[derive(Debug, Eq, PartialEq, Clone)]
pub enum DamusState {
    Initializing,
    Initialized,
}

/// We derive Deserialize/Serialize so we can persist app state on shutdown.
pub struct Damus {
    state: DamusState,
    note_cache: NoteCache,
    pub pool: RelayPool,

    /// global navigation for account management popups, etc.
    pub global_nav: Vec<Route>,

    pub timelines: Vec<Timeline>,
    pub selected_timeline: i32,

    pub ndb: Ndb,
    pub drafts: Drafts,
    pub threads: Threads,
    pub img_cache: ImageCache,
    pub account_manager: AccountManager,

    frame_history: crate::frame_history::FrameHistory,

    // TODO: make these flags
    is_mobile: bool,
    pub since_optimize: bool,
    pub textmode: bool,
    pub show_account_switcher: bool,
    pub show_global_popup: bool,
}

fn relay_setup(pool: &mut RelayPool, ctx: &egui::Context) {
    let ctx = ctx.clone();
    let wakeup = move || {
        ctx.request_repaint();
    };
    if let Err(e) = pool.add_url("ws://localhost:8080".to_string(), wakeup.clone()) {
        error!("{:?}", e)
    }
    if let Err(e) = pool.add_url("wss://relay.damus.io".to_string(), wakeup.clone()) {
        error!("{:?}", e)
    }
    //if let Err(e) = pool.add_url("wss://pyramid.fiatjaf.com".to_string(), wakeup.clone()) {
    //error!("{:?}", e)
    //}
    if let Err(e) = pool.add_url("wss://nos.lol".to_string(), wakeup.clone()) {
        error!("{:?}", e)
    }
    if let Err(e) = pool.add_url("wss://nostr.wine".to_string(), wakeup.clone()) {
        error!("{:?}", e)
    }
    if let Err(e) = pool.add_url("wss://purplepag.es".to_string(), wakeup) {
        error!("{:?}", e)
    }
}

/// Should we since optimize? Not always. For examplem if we only have a few
/// notes locally. One way to determine this is by looking at the current filter
/// and seeing what its limit is. If we have less notes than the limit,
/// we might want to backfill older notes
fn send_initial_filters(damus: &mut Damus, relay_url: &str) {
    info!("Sending initial filters to {}", relay_url);
    let mut c: u32 = 1;

    let can_since_optimize = damus.since_optimize;
    for relay in &mut damus.pool.relays {
        let relay = &mut relay.relay;
        if relay.url == relay_url {
            for timeline in &damus.timelines {
                let filter = timeline.filter.clone();
                let new_filters = filter.into_iter().map(|f| {
                    // limit the size of remote filters
                    let default_limit = crate::filter::default_remote_limit();
                    let mut lim = f.limit().unwrap_or(default_limit);
                    let mut filter = f;
                    if lim > default_limit {
                        lim = default_limit;
                        filter = filter.limit_mut(lim);
                    }

                    let notes = timeline.notes(ViewFilter::NotesAndReplies);
                    if can_since_optimize && crate::filter::should_since_optimize(lim, notes.len()) {
                        filter = crate::filter::since_optimize_filter(filter, notes);
                    } else {
                        warn!("Skipping since optimization for {:?}: number of local notes is less than limit, attempting to backfill.", filter);
                    }

                    filter
                }).collect();
                relay.subscribe(format!("initial{}", c), new_filters);
                c += 1;
            }
            return;
        }
    }
}

enum ContextAction {
    SetPixelsPerPoint(f32),
}

fn handle_key_events(
    input: &egui::InputState,
    pixels_per_point: f32,
    damus: &mut Damus,
) -> Option<ContextAction> {
    let amount = 0.2;

    // We can't do things like setting the pixels_per_point when we are holding
    // on to an locked InputState context, so we need to pass actions externally
    let mut context_action: Option<ContextAction> = None;

    for event in &input.raw.events {
        if let egui::Event::Key {
            key, pressed: true, ..
        } = event
        {
            match key {
                egui::Key::Equals => {
                    context_action =
                        Some(ContextAction::SetPixelsPerPoint(pixels_per_point + amount));
                }
                egui::Key::Minus => {
                    context_action =
                        Some(ContextAction::SetPixelsPerPoint(pixels_per_point - amount));
                }
                egui::Key::J => {
                    damus.select_down();
                }
                egui::Key::K => {
                    damus.select_up();
                }
                egui::Key::H => {
                    damus.select_left();
                }
                egui::Key::L => {
                    damus.select_left();
                }
                _ => {}
            }
        }
    }

    context_action
}

fn try_process_event(damus: &mut Damus, ctx: &egui::Context) -> Result<()> {
    let ppp = ctx.pixels_per_point();
    let res = ctx.input(|i| handle_key_events(i, ppp, damus));
    if let Some(action) = res {
        match action {
            ContextAction::SetPixelsPerPoint(amt) => {
                ctx.set_pixels_per_point(amt);
            }
        }
    }

    let ctx2 = ctx.clone();
    let wakeup = move || {
        ctx2.request_repaint();
    };
    damus.pool.keepalive_ping(wakeup);

    // pool stuff
    while let Some(ev) = damus.pool.try_recv() {
        let relay = ev.relay.to_owned();

        match (&ev.event).into() {
            RelayEvent::Opened => send_initial_filters(damus, &relay),
            // TODO: handle reconnects
            RelayEvent::Closed => warn!("{} connection closed", &relay),
            RelayEvent::Error(e) => error!("{}: {}", &relay, e),
            RelayEvent::Other(msg) => trace!("other event {:?}", &msg),
            RelayEvent::Message(msg) => process_message(damus, &relay, &msg),
        }
    }

    let txn = Transaction::new(&damus.ndb)?;
    let mut unknown_ids: HashSet<UnknownId> = HashSet::new();
    for timeline in 0..damus.timelines.len() {
        let src = TimelineSource::column(timeline);
        if let Err(err) = src.poll_notes_into_view(damus, &txn, &mut unknown_ids) {
            error!("{}", err);
        }
    }

    let unknown_ids: Vec<UnknownId> = unknown_ids.into_iter().collect();
    if let Some(filters) = get_unknown_ids_filter(&unknown_ids) {
        info!(
            "Getting {} unknown author profiles from relays",
            unknown_ids.len()
        );
        let msg = ClientMessage::req("unknown_ids".to_string(), filters);
        damus.pool.send(&msg);
    }

    Ok(())
}

#[derive(Hash, Clone, Copy, PartialEq, Eq)]
pub enum UnknownId<'a> {
    Pubkey(&'a [u8; 32]),
    Id(&'a [u8; 32]),
}

impl<'a> UnknownId<'a> {
    pub fn is_pubkey(&self) -> Option<&'a [u8; 32]> {
        match self {
            UnknownId::Pubkey(pk) => Some(pk),
            _ => None,
        }
    }

    pub fn is_id(&self) -> Option<&'a [u8; 32]> {
        match self {
            UnknownId::Id(id) => Some(id),
            _ => None,
        }
    }
}

/// Look for missing notes in various parts of notes that we see:
///
/// - pubkeys and notes mentioned inside the note
/// - notes being replied to
///
/// We return all of this in a HashSet so that we can fetch these from
/// remote relays.
///
pub fn get_unknown_note_ids<'a>(
    ndb: &Ndb,
    cached_note: &CachedNote,
    txn: &'a Transaction,
    note: &Note<'a>,
    note_key: NoteKey,
    ids: &mut HashSet<UnknownId<'a>>,
) -> Result<()> {
    // the author pubkey

    if ndb.get_profile_by_pubkey(txn, note.pubkey()).is_err() {
        ids.insert(UnknownId::Pubkey(note.pubkey()));
    }

    // pull notes that notes are replying to
    if cached_note.reply.root.is_some() {
        let note_reply = cached_note.reply.borrow(note.tags());
        if let Some(root) = note_reply.root() {
            if ndb.get_note_by_id(txn, root.id).is_err() {
                ids.insert(UnknownId::Id(root.id));
            }
        }

        if !note_reply.is_reply_to_root() {
            if let Some(reply) = note_reply.reply() {
                if ndb.get_note_by_id(txn, reply.id).is_err() {
                    ids.insert(UnknownId::Id(reply.id));
                }
            }
        }
    }

    let blocks = ndb.get_blocks_by_key(txn, note_key)?;
    for block in blocks.iter(note) {
        if block.blocktype() != BlockType::MentionBech32 {
            continue;
        }

        match block.as_mention().unwrap() {
            Mention::Pubkey(npub) => {
                if ndb.get_profile_by_pubkey(txn, npub.pubkey()).is_err() {
                    ids.insert(UnknownId::Pubkey(npub.pubkey()));
                }
            }
            Mention::Profile(nprofile) => {
                if ndb.get_profile_by_pubkey(txn, nprofile.pubkey()).is_err() {
                    ids.insert(UnknownId::Pubkey(nprofile.pubkey()));
                }
            }
            Mention::Event(ev) => match ndb.get_note_by_id(txn, ev.id()) {
                Err(_) => {
                    ids.insert(UnknownId::Id(ev.id()));
                    if let Some(pk) = ev.pubkey() {
                        if ndb.get_profile_by_pubkey(txn, pk).is_err() {
                            ids.insert(UnknownId::Pubkey(pk));
                        }
                    }
                }
                Ok(note) => {
                    if ndb.get_profile_by_pubkey(txn, note.pubkey()).is_err() {
                        ids.insert(UnknownId::Pubkey(note.pubkey()));
                    }
                }
            },
            Mention::Note(note) => match ndb.get_note_by_id(txn, note.id()) {
                Err(_) => {
                    ids.insert(UnknownId::Id(note.id()));
                }
                Ok(note) => {
                    if ndb.get_profile_by_pubkey(txn, note.pubkey()).is_err() {
                        ids.insert(UnknownId::Pubkey(note.pubkey()));
                    }
                }
            },
            _ => {}
        }
    }

    Ok(())
}

#[cfg(feature = "profiling")]
fn setup_profiling() {
    puffin::set_scopes_on(true); // tell puffin to collect data
}

fn setup_initial_nostrdb_subs(damus: &mut Damus) -> Result<()> {
    let timelines = damus.timelines.len();
    for i in 0..timelines {
        let filters = damus.timelines[i].filter.clone();
        damus.timelines[i].subscription = Some(damus.ndb.subscribe(filters.clone())?);
        let txn = Transaction::new(&damus.ndb)?;
        debug!(
            "querying nostrdb sub {} {:?}",
            damus.timelines[i].subscription.as_ref().unwrap().id,
            damus.timelines[i].filter
        );
        let results = damus.ndb.query(
            &txn,
            filters,
            damus.timelines[i].filter[0]
                .limit()
                .unwrap_or(crate::filter::default_limit()) as i32,
        )?;

        let filters = {
            let views = &damus.timelines[i].views;
            let filters: Vec<fn(&CachedNote, &Note) -> bool> =
                views.iter().map(|v| v.filter.filter()).collect();
            filters
        };

        for result in results {
            for (j, filter) in filters.iter().enumerate() {
                if filter(
                    damus
                        .note_cache_mut()
                        .cached_note_or_insert_mut(result.note_key, &result.note),
                    &result.note,
                ) {
                    damus.timelines[i].views[j].notes.push(NoteRef {
                        key: result.note_key,
                        created_at: result.note.created_at(),
                    })
                }
            }
        }
    }

    Ok(())
}

fn update_damus(damus: &mut Damus, ctx: &egui::Context) {
    if damus.state == DamusState::Initializing {
        #[cfg(feature = "profiling")]
        setup_profiling();

        damus.state = DamusState::Initialized;
        setup_initial_nostrdb_subs(damus).expect("home subscription failed");
    }

    if let Err(err) = try_process_event(damus, ctx) {
        error!("error processing event: {}", err);
    }
}

fn process_event(damus: &mut Damus, _subid: &str, event: &str) {
    #[cfg(feature = "profiling")]
    puffin::profile_function!();

    //info!("processing event {}", event);
    if let Err(_err) = damus.ndb.process_event(event) {
        error!("error processing event {}", event);
    }
}

fn get_unknown_ids<'a>(txn: &'a Transaction, damus: &mut Damus) -> Result<Vec<UnknownId<'a>>> {
    #[cfg(feature = "profiling")]
    puffin::profile_function!();

    let mut ids: HashSet<UnknownId> = HashSet::new();
    let mut new_cached_notes: Vec<(NoteKey, CachedNote)> = vec![];

    for timeline in &damus.timelines {
        for noteref in timeline.notes(ViewFilter::NotesAndReplies) {
            let note = damus.ndb.get_note_by_key(txn, noteref.key)?;
            let note_key = note.key().unwrap();
            let cached_note = damus.note_cache().cached_note(noteref.key);
            let cached_note = if let Some(cn) = cached_note {
                cn.clone()
            } else {
                let new_cached_note = CachedNote::new(&note);
                new_cached_notes.push((note_key, new_cached_note.clone()));
                new_cached_note
            };

            let _ = get_unknown_note_ids(
                &damus.ndb,
                &cached_note,
                txn,
                &note,
                note.key().unwrap(),
                &mut ids,
            );
        }
    }

    // This is mainly done to avoid the double mutable borrow that would happen
    // if we tried to update the note_cache mutably in the loop above
    for (note_key, note) in new_cached_notes {
        damus.note_cache_mut().cache_mut().insert(note_key, note);
    }

    Ok(ids.into_iter().collect())
}

fn get_unknown_ids_filter(ids: &[UnknownId<'_>]) -> Option<Vec<Filter>> {
    if ids.is_empty() {
        return None;
    }

    let mut filters: Vec<Filter> = vec![];

    let pks: Vec<&[u8; 32]> = ids.iter().flat_map(|id| id.is_pubkey()).collect();
    if !pks.is_empty() {
        let pk_filter = Filter::new().authors(pks).kinds([0]).build();

        filters.push(pk_filter);
    }

    let note_ids: Vec<&[u8; 32]> = ids.iter().flat_map(|id| id.is_id()).collect();
    if !note_ids.is_empty() {
        filters.push(Filter::new().ids(note_ids).build());
    }

    Some(filters)
}

fn handle_eose(damus: &mut Damus, subid: &str, relay_url: &str) -> Result<()> {
    if subid.starts_with("initial") {
        let txn = Transaction::new(&damus.ndb)?;
        let ids = get_unknown_ids(&txn, damus)?;
        if let Some(filters) = get_unknown_ids_filter(&ids) {
            info!("Getting {} unknown ids from {}", ids.len(), relay_url);
            let msg = ClientMessage::req("unknown_ids".to_string(), filters);
            damus.pool.send_to(&msg, relay_url);
        }
    } else if subid == "unknown_ids" {
        let msg = ClientMessage::close("unknown_ids".to_string());
        damus.pool.send_to(&msg, relay_url);
    } else {
        warn!("got unknown eose subid {}", subid);
    }

    Ok(())
}

fn process_message(damus: &mut Damus, relay: &str, msg: &RelayMessage) {
    match msg {
        RelayMessage::Event(subid, ev) => process_event(damus, subid, ev),
        RelayMessage::Notice(msg) => warn!("Notice from {}: {}", relay, msg),
        RelayMessage::OK(cr) => info!("OK {:?}", cr),
        RelayMessage::Eose(sid) => {
            if let Err(err) = handle_eose(damus, sid, relay) {
                error!("error handling eose: {}", err);
            }
        }
    }
}

fn render_damus(damus: &mut Damus, ctx: &Context) {
    if damus.is_mobile() {
        render_damus_mobile(ctx, damus);
    } else {
        render_damus_desktop(ctx, damus);
    }

    ctx.request_repaint_after(Duration::from_secs(1));

    #[cfg(feature = "profiling")]
    puffin_egui::profiler_window(ctx);
}

struct Args {
    timelines: Vec<Timeline>,
    relays: Vec<String>,
    is_mobile: Option<bool>,
    keys: Vec<Keypair>,
    since_optimize: bool,
    light: bool,
    dbpath: Option<String>,
}

impl Args {
    fn parse(args: &[String]) -> Self {
        let mut res = Args {
            timelines: vec![],
            relays: vec![],
            is_mobile: None,
            keys: vec![],
            light: false,
            since_optimize: true,
            dbpath: None,
        };

        let mut i = 0;
        let len = args.len();
        while i < len {
            let arg = &args[i];

            if arg == "--mobile" {
                res.is_mobile = Some(true);
            } else if arg == "--light" {
                res.light = true;
            } else if arg == "--dark" {
                res.light = false;
            } else if arg == "--pub" || arg == "--npub" {
                i += 1;
                let pubstr = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("sec argument missing?");
                    continue;
                };

                if let Ok(pk) = Pubkey::parse(pubstr) {
                    res.keys.push(Keypair::only_pubkey(pk));
                } else {
                    error!(
                        "failed to parse {} argument. Make sure to use hex or npub.",
                        arg
                    );
                }
            } else if arg == "--sec" || arg == "--nsec" {
                i += 1;
                let secstr = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("sec argument missing?");
                    continue;
                };

                if let Ok(sec) = SecretKey::parse(secstr) {
                    res.keys.push(Keypair::from_secret(sec));
                } else {
                    error!(
                        "failed to parse {} argument. Make sure to use hex or nsec.",
                        arg
                    );
                }
            } else if arg == "--no-since-optimize" {
                res.since_optimize = false;
            } else if arg == "--filter" {
                i += 1;
                let filter = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("filter argument missing?");
                    continue;
                };

                if let Ok(filter) = Filter::from_json(filter) {
                    res.timelines.push(Timeline::new(vec![filter]));
                } else {
                    error!("failed to parse filter '{}'", filter);
                }
            } else if arg == "--dbpath" {
                i += 1;
                let path = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("dbpath argument missing?");
                    continue;
                };
                res.dbpath = Some(path.clone());
            } else if arg == "-r" || arg == "--relay" {
                i += 1;
                let relay = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("relay argument missing?");
                    continue;
                };
                res.relays.push(relay.clone());
            } else if arg == "--filter-file" || arg == "-f" {
                i += 1;
                let filter_file = if let Some(next_arg) = args.get(i) {
                    next_arg
                } else {
                    error!("filter file argument missing?");
                    continue;
                };

                let data = if let Ok(data) = std::fs::read(filter_file) {
                    data
                } else {
                    error!("failed to read filter file '{}'", filter_file);
                    continue;
                };

                if let Some(filter) = std::str::from_utf8(&data)
                    .ok()
                    .and_then(|s| Filter::from_json(s).ok())
                {
                    res.timelines.push(Timeline::new(vec![filter]));
                } else {
                    error!("failed to parse filter in '{}'", filter_file);
                }
            }

            i += 1;
        }

        if res.timelines.is_empty() {
            let filter = Filter::from_json(include_str!("../queries/timeline.json")).unwrap();
            res.timelines.push(Timeline::new(vec![filter]));
        }

        res
    }
}

/*
fn determine_key_storage_type() -> KeyStorageType {
    #[cfg(target_os = "macos")]
    {
        KeyStorageType::MacOS
    }

    #[cfg(target_os = "linux")]
    {
        KeyStorageType::Linux
    }

    #[cfg(not(any(target_os = "macos", target_os = "linux")))]
    {
        KeyStorageType::None
    }
}
*/

impl Damus {
    /// Called once before the first frame.
    pub fn new<P: AsRef<Path>>(
        cc: &eframe::CreationContext<'_>,
        data_path: P,
        args: Vec<String>,
    ) -> Self {
        // arg parsing
        let parsed_args = Args::parse(&args);
        let is_mobile = parsed_args.is_mobile.unwrap_or(ui::is_compiled_as_mobile());

        setup_cc(cc, is_mobile, parsed_args.light);

        let dbpath = parsed_args
            .dbpath
            .unwrap_or(data_path.as_ref().to_str().expect("db path ok").to_string());

        let _ = std::fs::create_dir_all(dbpath.clone());

        let imgcache_dir = data_path.as_ref().join(ImageCache::rel_datadir());
        let _ = std::fs::create_dir_all(imgcache_dir.clone());

        let mut config = Config::new();
        config.set_ingester_threads(4);

        let mut account_manager = AccountManager::new(
            // TODO: should pull this from settings
            None,
            // TODO: use correct KeyStorage mechanism for current OS arch
            KeyStorageType::None,
        );

        for key in parsed_args.keys {
            info!("adding account: {}", key.pubkey);
            account_manager.add_account(key);
        }

        // TODO: pull currently selected account from settings
        if account_manager.num_accounts() > 0 {
            account_manager.select_account(0);
        }

        // setup relays if we have them
        let pool = if parsed_args.relays.is_empty() {
            let mut pool = RelayPool::new();
            relay_setup(&mut pool, &cc.egui_ctx);
            pool
        } else {
            let ctx = cc.egui_ctx.clone();
            let wakeup = move || {
                ctx.request_repaint();
            };
            let mut pool = RelayPool::new();
            for relay in parsed_args.relays {
                if let Err(e) = pool.add_url(relay.clone(), wakeup.clone()) {
                    error!("error adding relay {}: {}", relay, e);
                }
            }
            pool
        };

        Self {
            pool,
            is_mobile,
            since_optimize: parsed_args.since_optimize,
            threads: Threads::default(),
            drafts: Drafts::default(),
            state: DamusState::Initializing,
            img_cache: ImageCache::new(imgcache_dir),
            note_cache: NoteCache::default(),
            selected_timeline: 0,
            timelines: parsed_args.timelines,
            textmode: false,
            ndb: Ndb::new(&dbpath, &config).expect("ndb"),
            account_manager,
            //compose: "".to_string(),
            frame_history: FrameHistory::default(),
            show_account_switcher: false,
            show_global_popup: false,
            global_nav: Vec::new(),
        }
    }

    pub fn mock<P: AsRef<Path>>(data_path: P, is_mobile: bool) -> Self {
        let mut timelines: Vec<Timeline> = vec![];
        let filter = Filter::from_json(include_str!("../queries/global.json")).unwrap();
        timelines.push(Timeline::new(vec![filter]));

        let imgcache_dir = data_path.as_ref().join(ImageCache::rel_datadir());
        let _ = std::fs::create_dir_all(imgcache_dir.clone());

        let mut config = Config::new();
        config.set_ingester_threads(2);
        Self {
            is_mobile,
            since_optimize: true,
            threads: Threads::default(),
            drafts: Drafts::default(),
            state: DamusState::Initializing,
            pool: RelayPool::new(),
            img_cache: ImageCache::new(imgcache_dir),
            note_cache: NoteCache::default(),
            selected_timeline: 0,
            timelines,
            textmode: false,
            ndb: Ndb::new(data_path.as_ref().to_str().expect("db path ok"), &config).expect("ndb"),
            account_manager: AccountManager::new(None, KeyStorageType::None),
            frame_history: FrameHistory::default(),
            show_account_switcher: false,
            show_global_popup: true,
            global_nav: Vec::new(),
        }
    }

    pub fn note_cache_mut(&mut self) -> &mut NoteCache {
        &mut self.note_cache
    }

    pub fn note_cache(&self) -> &NoteCache {
        &self.note_cache
    }

    pub fn selected_timeline(&mut self) -> &mut Timeline {
        &mut self.timelines[self.selected_timeline as usize]
    }

    pub fn select_down(&mut self) {
        self.selected_timeline().current_view_mut().select_down();
    }

    pub fn select_up(&mut self) {
        self.selected_timeline().current_view_mut().select_up();
    }

    pub fn select_left(&mut self) {
        if self.selected_timeline - 1 < 0 {
            return;
        }
        self.selected_timeline -= 1;
    }

    pub fn select_right(&mut self) {
        if self.selected_timeline + 1 >= self.timelines.len() as i32 {
            return;
        }
        self.selected_timeline += 1;
    }

    pub fn is_mobile(&self) -> bool {
        self.is_mobile
    }
}

/*
fn circle_icon(ui: &mut egui::Ui, openness: f32, response: &egui::Response) {
    let stroke = ui.style().interact(&response).fg_stroke;
    let radius = egui::lerp(2.0..=3.0, openness);
    ui.painter()
        .circle_filled(response.rect.center(), radius, stroke.color);
}
*/

fn top_panel(ctx: &egui::Context) -> egui::TopBottomPanel {
    let top_margin = egui::Margin {
        top: 4.0,
        left: 8.0,
        right: 8.0,
        ..Default::default()
    };

    let frame = Frame {
        inner_margin: top_margin,
        fill: ctx.style().visuals.panel_fill,
        ..Default::default()
    };

    egui::TopBottomPanel::top("top_panel")
        .frame(frame)
        .show_separator_line(false)
}

fn render_panel(ctx: &egui::Context, app: &mut Damus, timeline_ind: usize) {
    top_panel(ctx).show(ctx, |ui| {
        ui.with_layout(egui::Layout::right_to_left(egui::Align::TOP), |ui| {
            ui.visuals_mut().button_frame = false;

            if let Some(new_visuals) =
                user_requested_visuals_change(app.is_mobile(), ctx.style().visuals.dark_mode, ui)
            {
                ctx.set_visuals(new_visuals)
            }

            if ui
                .add(egui::Button::new("A").frame(false))
                .on_hover_text("Text mode")
                .clicked()
            {
                app.textmode = !app.textmode;
            }

            /*
            if ui
                .add(egui::Button::new("+").frame(false))
                .on_hover_text("Add Timeline")
                .clicked()
            {
                app.n_panels += 1;
            }

            if app.n_panels != 1
                && ui
                    .add(egui::Button::new("-").frame(false))
                    .on_hover_text("Remove Timeline")
                    .clicked()
            {
                app.n_panels -= 1;
            }
            */

            //#[cfg(feature = "profiling")]
            {
                ui.weak(format!(
                    "FPS: {:.2}, {:10.1}ms",
                    app.frame_history.fps(),
                    app.frame_history.mean_frame_time() * 1e3
                ));

                if !app.timelines.is_empty() {
                    ui.weak(format!(
                        "{} notes",
                        &app.timelines[timeline_ind]
                            .notes(ViewFilter::NotesAndReplies)
                            .len()
                    ));
                }
            }
        });
    });
}

/// Local thread unsubscribe
fn thread_unsubscribe(app: &mut Damus, id: &[u8; 32]) {
    let (unsubscribe, remote_subid) = {
        let txn = Transaction::new(&app.ndb).expect("txn");
        let root_id = crate::note::root_note_id_from_selected_id(app, &txn, id);

        let thread = app.threads.thread_mut(&app.ndb, &txn, root_id).get_ptr();
        let unsub = thread.decrement_sub();

        let mut remote_subid: Option<String> = None;
        if let Ok(DecrementResult::LastSubscriber(_subid)) = unsub {
            *thread.subscription_mut() = None;
            remote_subid = thread.remote_subscription().to_owned();
            *thread.remote_subscription_mut() = None;
        }

        (unsub, remote_subid)
    };

    match unsubscribe {
        Ok(DecrementResult::LastSubscriber(sub_id)) => {
            if let Err(e) = app.ndb.unsubscribe(sub_id) {
                error!("failed to unsubscribe from thread: {e}, subid:{sub_id}, {} active subscriptions", app.ndb.subscription_count());
            } else {
                info!(
                    "Unsubscribed from thread subid:{}. {} active subscriptions",
                    sub_id,
                    app.ndb.subscription_count()
                );
            }

            // unsub from remote
            if let Some(subid) = remote_subid {
                app.pool.unsubscribe(subid);
            }
        }

        Ok(DecrementResult::ActiveSubscribers) => {
            info!(
                "Keeping thread subscription. {} active subscriptions.",
                app.ndb.subscription_count()
            );
            // do nothing
        }

        Err(e) => {
            // something is wrong!
            error!(
                "Thread unsubscribe error: {e}. {} active subsciptions.",
                app.ndb.subscription_count()
            );
        }
    }
}

fn render_nav(routes: Vec<Route>, timeline_ind: usize, app: &mut Damus, ui: &mut egui::Ui) {
    let navigating = app.timelines[timeline_ind].navigating;
    let returning = app.timelines[timeline_ind].returning;
    let app_ctx = Rc::new(RefCell::new(app));

    let nav_response = Nav::new(routes)
        .navigating(navigating)
        .returning(returning)
        .title(false)
        .show(ui, |ui, nav| match nav.top() {
            Route::Timeline(_n) => {
                let app = &mut app_ctx.borrow_mut();
                ui::TimelineView::new(app, timeline_ind).ui(ui);
                None
            }

            Route::ManageAccount => {
                ui.label("account management view");
                None
            }

            Route::Relays => {
                let pool = &mut app_ctx.borrow_mut().pool;
                let manager = RelayPoolManager::new(pool);
                RelayView::new(manager).ui(ui);
                None
            }

            Route::Thread(id) => {
                let app = &mut app_ctx.borrow_mut();
                let result = ui::ThreadView::new(app, timeline_ind, id.bytes()).ui(ui);

                if let Some(bar_result) = result {
                    match bar_result {
                        BarResult::NewThreadNotes(new_notes) => {
                            let thread = app.threads.thread_expected_mut(new_notes.root_id.bytes());
                            new_notes.process(thread);
                        }
                    }
                }

                None
            }

            Route::Reply(id) => {
                let mut app = app_ctx.borrow_mut();

                let txn = if let Ok(txn) = Transaction::new(&app.ndb) {
                    txn
                } else {
                    ui.label("Reply to unknown note");
                    return None;
                };

                let note = if let Ok(note) = app.ndb.get_note_by_id(&txn, id.bytes()) {
                    note
                } else {
                    ui.label("Reply to unknown note");
                    return None;
                };

                let id = egui::Id::new(("post", timeline_ind, note.key().unwrap()));
                let response = egui::ScrollArea::vertical().show(ui, |ui| {
                    ui::PostReplyView::new(&mut app, &note)
                        .id_source(id)
                        .show(ui)
                });

                Some(response)
            }
        });

    let mut app = app_ctx.borrow_mut();
    if let Some(reply_response) = nav_response.inner {
        if let Some(PostAction::Post(_np)) = reply_response.inner.action {
            app.timelines[timeline_ind].returning = true;
        }
    }

    if let Some(NavAction::Returned) = nav_response.action {
        let popped = app.timelines[timeline_ind].routes.pop();
        if let Some(Route::Thread(id)) = popped {
            thread_unsubscribe(&mut app, id.bytes());
        }
        app.timelines[timeline_ind].returning = false;
    } else if let Some(NavAction::Navigated) = nav_response.action {
        app.timelines[timeline_ind].navigating = false;
    }
}

fn render_damus_mobile(ctx: &egui::Context, app: &mut Damus) {
    //render_panel(ctx, app, 0);

    #[cfg(feature = "profiling")]
    puffin::profile_function!();

    //let routes = app.timelines[0].routes.clone();

    main_panel(&ctx.style(), app.is_mobile()).show(ctx, |ui| {
        render_nav(app.timelines[0].routes.clone(), 0, app, ui);
    });
}

fn main_panel(style: &Style, mobile: bool) -> egui::CentralPanel {
    let inner_margin = egui::Margin {
        top: if mobile { 50.0 } else { 0.0 },
        left: 0.0,
        right: 0.0,
        bottom: 0.0,
    };
    egui::CentralPanel::default().frame(Frame {
        inner_margin,
        fill: style.visuals.panel_fill,
        ..Default::default()
    })
}

fn render_damus_desktop(ctx: &egui::Context, app: &mut Damus) {
    render_panel(ctx, app, 0);
    #[cfg(feature = "profiling")]
    puffin::profile_function!();

    let screen_size = ctx.screen_rect().width();
    let calc_panel_width = (screen_size / app.timelines.len() as f32) - 30.0;
    let min_width = 320.0;
    let need_scroll = calc_panel_width < min_width;
    let panel_sizes = if need_scroll {
        Size::exact(min_width)
    } else {
        Size::remainder()
    };

    main_panel(&ctx.style(), app.is_mobile()).show(ctx, |ui| {
        ui.spacing_mut().item_spacing.x = 0.0;
        AccountSelectionWidget::ui(app, ui);
        DesktopGlobalPopup::show(app.global_nav.clone(), app, ui);
        if need_scroll {
            egui::ScrollArea::horizontal().show(ui, |ui| {
                timelines_view(ui, panel_sizes, app, app.timelines.len());
            });
        } else {
            timelines_view(ui, panel_sizes, app, app.timelines.len());
        }
    });
}

fn timelines_view(ui: &mut egui::Ui, sizes: Size, app: &mut Damus, timelines: usize) {
    StripBuilder::new(ui)
        .size(Size::exact(40.0))
        .sizes(sizes, timelines)
        .clip(true)
        .horizontal(|mut strip| {
            strip.cell(|ui| {
                let rect = ui.available_rect_before_wrap();
                let side_panel = DesktopSidePanel::new(app).show(ui);

                if side_panel.response.clicked() {
                    info!("clicked {:?}", side_panel.action);
                }

                DesktopSidePanel::perform_action(app, side_panel.action);

                // vertical sidebar line
                ui.painter().vline(
                    rect.right(),
                    rect.y_range(),
                    ui.visuals().widgets.noninteractive.bg_stroke,
                );
            });

            for timeline_ind in 0..timelines {
                strip.cell(|ui| {
                    let rect = ui.available_rect_before_wrap();
                    render_nav(
                        app.timelines[timeline_ind].routes.clone(),
                        timeline_ind,
                        app,
                        ui,
                    );

                    // vertical line
                    ui.painter().vline(
                        rect.right(),
                        rect.y_range(),
                        ui.visuals().widgets.noninteractive.bg_stroke,
                    );
                });

                //strip.cell(|ui| timeline::timeline_view(ui, app, timeline_ind));
            }
        });
}

impl eframe::App for Damus {
    /// Called by the frame work to save state before shutdown.
    fn save(&mut self, _storage: &mut dyn eframe::Storage) {
        //eframe::set_value(storage, eframe::APP_KEY, self);
    }

    /// Called each time the UI needs repainting, which may be many times per second.
    /// Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
    fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
        self.frame_history
            .on_new_frame(ctx.input(|i| i.time), frame.info().cpu_usage);

        #[cfg(feature = "profiling")]
        puffin::GlobalProfiler::lock().new_frame();
        update_damus(self, ctx);
        render_damus(self, ctx);
    }
}