romm-tui 1.5.0

Terminal UI for the RomM API
Documentation 
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//! Library startup and overlay restore helpers.

use std::time::Instant;

use romm_api::core::startup_library_snapshot;

use super::super::{App, AppScreen};
use crate::tui::screens::LibraryBrowseScreen;

impl App {
    pub(in crate::tui::app) fn is_overlay_screen(screen: &AppScreen) -> bool {
        matches!(
            screen,
            AppScreen::Search(_) | AppScreen::Settings(_) | AppScreen::Download(_)
        )
    }

    /// Short-lived placeholder during `mem::replace` screen swaps.
    pub(in crate::tui::app) fn transient_screen_placeholder(&self) -> AppScreen {
        AppScreen::LibraryBrowse(Box::new(LibraryBrowseScreen::new(
            Vec::new(),
            Vec::new(),
            self.config.tui_layout.library_left_panel_percent,
        )))
    }

    /// Open library browse (startup home) with snapshot preload and metadata refresh.
    pub fn open_library_browse(&mut self) {
        let start = Instant::now();
        let snap = startup_library_snapshot::load_snapshot();
        let (platforms, collections, from_disk) = match snap {
            Some(s) => (s.platforms, s.collections, true),
            None => (Vec::new(), Vec::new(), false),
        };
        let mut lib = LibraryBrowseScreen::new(
            platforms,
            collections,
            self.config.tui_layout.library_left_panel_percent,
        );
        if from_disk && lib.list_len() > 0 {
            lib.set_metadata_footer(Some("Refreshing library metadata in background…".into()));
        } else if lib.list_len() == 0 {
            lib.set_metadata_footer(Some("Loading library metadata…".into()));
        }
        let restored = lib.restore_selection(&self.config.tui_layout.library_selection);
        if !restored {
            lib.prefer_first_complete_cache_hit(&self.rom_cache);
        }
        self.screen = AppScreen::LibraryBrowse(Box::new(lib));
        if let AppScreen::LibraryBrowse(ref lib) = self.screen {
            if lib.list_len() > 0 {
                let key = lib.cache_key();
                let expected = lib.expected_rom_count();
                let req = lib.get_roms_request();
                self.apply_selection_rom_load(key, req, expected, "startup_first_selection");
            }
        }
        self.persist_library_selection_if_changed();
        self.spawn_library_metadata_refresh();
        tracing::debug!(
            "library-open latency_ms={} snapshot_hit={} selection_restored={}",
            start.elapsed().as_millis(),
            from_disk,
            restored
        );
    }

    pub(in crate::tui::app) fn restore_screen_or_library(&mut self, stored: Option<AppScreen>) {
        self.screen = stored.unwrap_or_else(|| {
            let mut lib = LibraryBrowseScreen::new(
                Vec::new(),
                Vec::new(),
                self.config.tui_layout.library_left_panel_percent,
            );
            lib.set_metadata_footer(Some("Loading library metadata…".into()));
            AppScreen::LibraryBrowse(Box::new(lib))
        });
        if matches!(self.screen, AppScreen::LibraryBrowse(_)) {
            self.spawn_library_metadata_refresh();
            self.resume_library_rom_load_if_needed("restore_partial_library");
        }
    }
}