teksilo-widgets 0.9.1

// SPDX-License-Identifier: MPL-2.0
// SPDX-FileCopyrightText: 2026 FernTech

//! Tooltip content registry.
//!
//! A central map from **tooltip keys** (short identifiers) to
//! [`TooltipContent`] — the translatable strings + optional shortcut
//! metadata that rich-tooltip widgets resolve at hover time.
//!
//! Two entry points:
//! - [`TooltipContent::new`] (plus `.with_more` / `.with_shortcut_label`
//!   / `.for_shortcut`) builds an entry at app boot.
//! - [`install_tooltip_registry`] freezes a `Vec<TooltipContent>` into a
//!   thread-local registry that the tooltip widget reads from.
//!
//! The registry is populated once by
//! `TeksiloAppBuilder::register_tooltips(...)` before the first frame
//! builds and is read-only for the rest of the process lifetime.
//!
//! # URL scheme
//!
//! Inline links inside tooltip body text address other tooltip entries
//! via the `:key` URL prefix. A link written as `[2 minutes](:autosave-details)`
//! in a translated string becomes a hover-trigger for the tooltip
//! registered under the `"autosave-details"` key. Use
//! [`TooltipRegistry::parse_url`] to recognize `:key` URLs; every other
//! URL scheme (`http://`, `mailto:`, …) passes through unmodified.

use std::cell::RefCell;
use std::collections::HashMap;

use teksilo_i18n::LocalizedString;

/// One tooltip content entry.
///
/// Every tooltip may optionally carry a long-form "more" body (revealed
/// by the Accordion disclosure inside a sticky rich tooltip) and a
/// keyboard shortcut hint.
///
/// A shortcut hint may be supplied two ways: `shortcut_label` is a
/// literal override used verbatim, while `shortcut_id` binds to a
/// registered shortcut — the tooltip widget reads the effective primary
/// keystroke from the tree's
/// [`ShortcutRegistry`](teksilo_core::shortcut::ShortcutRegistry) via
/// `ctx.effective_shortcut(id)`, formats it with `format_keystroke`, and
/// refreshes on user rebinds via `ctx.shortcut_version()`. A
/// `shortcut_label` takes precedence over `shortcut_id` when both are set.
///
/// [`MenuItem`]: crate::menu_item::MenuItem
pub struct TooltipContent {
    /// Stable identifier. Referenced from link targets as `[label](:key)`.
    pub key: String,
    /// Primary body — rendered through TextWidget with inline markup
    /// enabled, so it may contain further `[label](:other-key)` links.
    pub text: LocalizedString,
    /// Optional long-form content, revealed by the Accordion disclosure
    /// inside a sticky tooltip. Same inline-markup pipeline as `text`.
    pub more: Option<LocalizedString>,
    /// Manual shortcut label override (e.g. "Ctrl+Shift+S"). Used
    /// verbatim when set; takes precedence over `shortcut_id`.
    pub shortcut_label: Option<String>,
    /// Registered shortcut id — the tooltip renders the effective
    /// primary keystroke from the tree's
    /// [`ShortcutRegistry`](teksilo_core::shortcut::ShortcutRegistry) and
    /// tracks user rebinds automatically.
    pub shortcut_id: Option<&'static str>,
}

impl std::fmt::Debug for TooltipContent {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("TooltipContent")
            .field("key", &self.key)
            .field("has_more", &self.more.is_some())
            .field("shortcut_label", &self.shortcut_label)
            .field("shortcut_id", &self.shortcut_id)
            .finish()
    }
}

impl Clone for TooltipContent {
    fn clone(&self) -> Self {
        Self {
            key: self.key.clone(),
            text: self.text.clone(),
            more: self.more.clone(),
            shortcut_label: self.shortcut_label.clone(),
            shortcut_id: self.shortcut_id,
        }
    }
}

impl TooltipContent {
    /// Build an entry with a primary body and no extras.
    pub fn new(key: impl Into<String>, text: LocalizedString) -> Self {
        Self {
            key: key.into(),
            text,
            more: None,
            shortcut_label: None,
            shortcut_id: None,
        }
    }

    /// Attach a long-form body revealed by the Accordion disclosure.
    pub fn with_more(mut self, more: LocalizedString) -> Self {
        self.more = Some(more);
        self
    }

    /// Attach a manual shortcut label override ("Ctrl+Shift+S",
    /// "Hold ⇧ + drag", …). Takes precedence over
    /// [`TooltipContent::for_shortcut`].
    pub fn with_shortcut_label(mut self, s: impl Into<String>) -> Self {
        self.shortcut_label = Some(s.into());
        self
    }

    /// Bind the tooltip's trailing chip to a registered shortcut id.
    /// The tooltip widget reads the effective primary keystroke from
    /// the tree's shortcut registry and refreshes on user rebinds.
    pub fn for_shortcut(mut self, id: &'static str) -> Self {
        self.shortcut_id = Some(id);
        self
    }

    pub fn has_more(&self) -> bool {
        self.more.is_some()
    }

    pub fn has_shortcut(&self) -> bool {
        self.shortcut_label.is_some() || self.shortcut_id.is_some()
    }
}

/// Frozen, read-only registry keyed by tooltip id.
#[derive(Default)]
pub struct TooltipRegistry {
    by_key: HashMap<String, TooltipContent>,
}

impl TooltipRegistry {
    /// Look up an entry by its stable key.
    pub fn get(&self, key: &str) -> Option<&TooltipContent> {
        self.by_key.get(key)
    }

    /// Parse a link URL as a tooltip key. Returns `Some(key)` when the
    /// URL starts with the `:` prefix, `None` otherwise (so ordinary
    /// http / mailto links pass through unmodified).
    pub fn parse_url(url: &str) -> Option<&str> {
        url.strip_prefix(':')
    }

    /// Resolve a link URL straight to a content entry, if the URL is a
    /// tooltip key and the key is registered.
    pub fn resolve_url(&self, url: &str) -> Option<&TooltipContent> {
        Self::parse_url(url).and_then(|k| self.get(k))
    }

    /// Iterate every registered entry. Useful for diagnostics and tests.
    pub fn iter(&self) -> impl Iterator<Item = (&String, &TooltipContent)> {
        self.by_key.iter()
    }

    pub fn len(&self) -> usize {
        self.by_key.len()
    }

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

// Thread-local storage. The registry is installed once by
// `install_tooltip_registry` from `TeksiloAppBuilder::register_tooltips`
// at app boot and is read-only afterwards. The "install once" invariant
// is enforced at runtime (debug-build panic on double-install) rather
// than by the cell type, so tests can reset it without `unsafe` — see
// `_reset_tooltip_registry`. Mirrors the `RefCell<Option<_>>` pattern
// used by `teksilo-i18n`'s thread-local manager slot.
thread_local! {
    static TOOLTIP_REGISTRY: RefCell<Option<TooltipRegistry>> = const { RefCell::new(None) };
}

/// Install the tooltip registry for the current thread. Called once
/// by `TeksiloAppBuilder::register_tooltips` before the first frame
/// builds. Panics in debug builds on double-install; logs and keeps
/// the first installation in release.
///
/// `contents` may hold several registrations for one key, because
/// `register_tooltips` accumulates across calls so that plugins,
/// extensions and sibling crates can each contribute a catalogue.
/// **The first registration of a key wins**, matching
/// `I18nConfig::compile_in`: the application registers first, and a
/// later contributor cannot silently shadow one of its tooltips.
/// Contributors should namespace their keys (`myext-panel-title`).
pub fn install_tooltip_registry(contents: Vec<TooltipContent>) {
    let mut by_key: HashMap<String, TooltipContent> = HashMap::new();
    for c in contents {
        // `or_insert_with` rather than `insert`: first-wins. A plain
        // `collect()` here would be last-wins, which is the same
        // shadowing hazard the additive builder exists to avoid.
        by_key.entry(c.key.clone()).or_insert(c);
    }
    let reg = TooltipRegistry { by_key };
    TOOLTIP_REGISTRY.with(|slot| {
        let mut slot = slot.borrow_mut();
        if slot.is_some() {
            // Debug: enforce the install-once invariant. Release: keep
            // the first installation and warn so the misuse surfaces.
            debug_assert!(false, "tooltip registry already installed");
            eprintln!(
                "[teksilo-widgets::tooltip] install_tooltip_registry called twice — \
                 keeping the first installation and ignoring the second. \
                 Check that TeksiloAppBuilder::register_tooltips is only invoked once."
            );
            return;
        }
        *slot = Some(reg);
    });
}

/// Read-side helper used by the tooltip widget. Runs `f` with a
/// borrowed reference to the installed registry. Returns `None` if no
/// registry has been installed yet (early bootstrap, headless tests).
pub fn with_tooltip_registry<R>(f: impl FnOnce(&TooltipRegistry) -> R) -> Option<R> {
    TOOLTIP_REGISTRY.with(|slot| slot.borrow().as_ref().map(f))
}

/// Test-only helper: reset the thread-local registry. Not exposed in
/// release builds — tests clone-install-read then move on.
#[cfg(test)]
pub(crate) fn _reset_tooltip_registry() {
    TOOLTIP_REGISTRY.with(|slot| {
        *slot.borrow_mut() = None;
    });
}

#[cfg(test)]
mod tests {
    use super::*;
    use teksilo_i18n::lit;

    #[test]
    fn parse_url_recognizes_colon_prefix() {
        assert_eq!(TooltipRegistry::parse_url(":foo"), Some("foo"));
        assert_eq!(
            TooltipRegistry::parse_url(":autosave-details"),
            Some("autosave-details")
        );
    }

    #[test]
    fn parse_url_rejects_non_tooltip_schemes() {
        assert_eq!(TooltipRegistry::parse_url("http://example.com"), None);
        assert_eq!(TooltipRegistry::parse_url("mailto:foo@bar"), None);
        assert_eq!(TooltipRegistry::parse_url(""), None);
        assert_eq!(TooltipRegistry::parse_url("autosave"), None);
    }

    #[test]
    fn parse_url_empty_key_is_some_empty() {
        // Caller is responsible for rejecting empty keys.
        assert_eq!(TooltipRegistry::parse_url(":"), Some(""));
    }

    #[test]
    fn content_builder_chain() {
        let c = TooltipContent::new("save-as", lit!("Save the file as…"))
            .with_shortcut_label("Ctrl+Shift+S");
        assert_eq!(c.key, "save-as");
        assert!(!c.has_more());
        assert!(c.has_shortcut());
        assert_eq!(c.shortcut_label.as_deref(), Some("Ctrl+Shift+S"));
    }

    #[test]
    fn content_with_more_sets_more() {
        let c =
            TooltipContent::new("autosave", lit!("Autosaves.")).with_more(lit!("Every 2 minutes."));
        assert!(c.has_more());
    }

    #[test]
    fn register_and_lookup_roundtrip() {
        _reset_tooltip_registry();
        install_tooltip_registry(vec![
            TooltipContent::new("foo", lit!("Foo body")),
            TooltipContent::new("bar", lit!("Bar body")).with_shortcut_label("Ctrl+B"),
        ]);

        let found = with_tooltip_registry(|r| {
            assert_eq!(r.len(), 2);
            let foo = r.get("foo").expect("foo registered");
            assert_eq!(foo.key, "foo");
            let bar = r.get("bar").expect("bar registered");
            assert_eq!(bar.shortcut_label.as_deref(), Some("Ctrl+B"));
            "ok"
        });
        assert_eq!(found, Some("ok"));

        _reset_tooltip_registry();
    }

    #[test]
    fn resolve_url_returns_content_for_registered_key() {
        _reset_tooltip_registry();
        install_tooltip_registry(vec![TooltipContent::new("docs", lit!("Documentation"))]);

        let body = with_tooltip_registry(|r| r.resolve_url(":docs").map(|c| c.text.resolve_now()))
            .flatten();
        assert_eq!(body.as_deref(), Some("Documentation"));

        let missing = with_tooltip_registry(|r| r.resolve_url(":nope").is_some());
        assert_eq!(missing, Some(false));

        let non_tooltip = with_tooltip_registry(|r| r.resolve_url("http://x").is_some());
        assert_eq!(non_tooltip, Some(false));

        _reset_tooltip_registry();
    }

    // NOTE: `with_command_stores_type_erased_ref` test removed along
    // with the `command` field. Registry-backed shortcut resolution is
    // exercised in the `RichTooltipWidget` build path (see tooltip/rich.rs),
    // which reads `ctx.effective_shortcut(id)` and binds `shortcut_version`.
}

#[cfg(test)]
mod additive_tests {
    use super::*;
    use teksilo_i18n::lit;

    fn content(key: &str, body: &str) -> TooltipContent {
        TooltipContent::new(key, lit!(body))
    }

    /// Registering the same key twice keeps the **first**.
    ///
    /// The app registers its catalogue first and a contributor's comes after,
    /// so first-wins is what stops an extension shadowing an application
    /// tooltip. A plain `collect()` into the map — which is what this used to
    /// be — is last-wins and would let exactly that happen.
    #[test]
    fn the_first_registration_of_a_key_wins() {
        _reset_tooltip_registry();
        install_tooltip_registry(vec![
            content("shared", "from the application"),
            content("shared", "from a contributor"),
        ]);
        // Compare the *body*, not the key — both entries carry the same key, so
        // asserting on it would pass whichever registration survived.
        let body = with_tooltip_registry(|r| r.get("shared").map(|c| c.text.resolve_now()));
        assert_eq!(
            body,
            Some(Some("from the application".to_string())),
            "a later contributor must not shadow an application tooltip"
        );
        assert_eq!(
            with_tooltip_registry(|r| r.len()),
            Some(1),
            "a duplicate key must collapse to one entry, not two"
        );
        _reset_tooltip_registry();
    }

    /// Several contributors' catalogues all survive into one registry.
    ///
    /// This is the shape `TeksiloAppBuilder::register_tooltips` produces now
    /// that it accumulates: the application's entries plus every extension's,
    /// concatenated, installed once.
    #[test]
    fn catalogues_from_several_contributors_all_resolve() {
        _reset_tooltip_registry();
        install_tooltip_registry(vec![
            content("app-save", "Save the project"),
            content("app-quit", "Leave"),
            content("ext-beats", "Structure beats"),
            content("other-ext-badge", "Drift"),
        ]);
        for key in ["app-save", "app-quit", "ext-beats", "other-ext-badge"] {
            assert_eq!(
                with_tooltip_registry(|r| r.get(key).is_some()),
                Some(true),
                "`{key}` must be reachable after a merged install"
            );
        }
        _reset_tooltip_registry();
    }
}