guise-ui 1.5.0

//! `UpdateNotice` — the answer to a check that had nothing to install
//! (gpui entity).
//!
//! A panel rather than a desktop notification: a notification is silently dropped
//! when the user has denied the app permission to post one, and a "Check for
//! Updates…" that appears to do nothing at all is worse than the answer being
//! unwelcome. [`UpdatePrompt`](super::UpdatePrompt) already works this way; this
//! is the other half of it.

use gpui::prelude::*;
use gpui::{
    div, px, App, Context, EventEmitter, FocusHandle, Focusable, FontWeight, IntoElement,
    KeyDownEvent, MouseButton, SharedString, Window, WindowControlArea,
};

use super::Updater;
use crate::devtools::Probed;
use crate::theme::{theme, Size};
use crate::{Button, Variant};

/// Height of the strip that drags the window, and the padding that clears a
/// transparent titlebar. A platform metric, not a themed one.
const TITLEBAR: f32 = 34.0;

/// The outcome of a check that has nothing to install — everything the prompt
/// cannot represent, because it exists to run an install.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum UpdateOutcome {
    /// Nothing newer is published.
    UpToDate,
    /// Something newer exists but hasn't uploaded what this machine installs.
    Pending(String),
    /// The check itself failed (offline, the host down, a parse error).
    Failed(String),
}

impl UpdateOutcome {
    /// Headline and detail. Both are needed: "You're up to date" alone leaves a
    /// user who half-expected an update wondering whether the check ran at all.
    pub fn lines(&self, app: &str, current: &str) -> (String, String) {
        match self {
            UpdateOutcome::UpToDate => (
                "You're up to date".to_string(),
                format!("{app} {current} is the latest version."),
            ),
            UpdateOutcome::Pending(version) => (
                format!("{app} {version} is on the way"),
                "It is still building for this platform. Check again shortly.".to_string(),
            ),
            UpdateOutcome::Failed(why) => ("Couldn't check for updates".to_string(), why.clone()),
        }
    }
}

/// Emitted when the notice is done with.
#[derive(Debug, Clone)]
pub enum UpdateNoticeEvent {
    /// The user acknowledged it (the button or Escape). Whoever owns the window
    /// closes it.
    Dismissed,
}

/// The short answer to a manual update check.
pub struct UpdateNotice {
    updater: Updater,
    outcome: UpdateOutcome,
    window_root: bool,
    focus: FocusHandle,
}

impl UpdateNotice {
    pub fn new(updater: Updater, outcome: UpdateOutcome, cx: &mut Context<Self>) -> Self {
        UpdateNotice {
            updater,
            outcome,
            window_root: false,
            focus: cx.focus_handle(),
        }
    }

    /// Whether this notice is the root view of its own window: draws the titlebar
    /// drag strip and pads for a transparent titlebar. [`super::check_now`] sets
    /// it; leave it off when embedding the notice in a window of your own.
    pub fn window_root(mut self, window_root: bool) -> Self {
        self.window_root = window_root;
        self
    }

    /// What the check found.
    pub fn outcome(&self) -> &UpdateOutcome {
        &self.outcome
    }

    /// Acknowledge the notice.
    pub fn dismiss(&mut self, cx: &mut Context<Self>) {
        cx.emit(UpdateNoticeEvent::Dismissed);
    }

    fn key_down(&mut self, event: &KeyDownEvent, _window: &mut Window, cx: &mut Context<Self>) {
        if event.keystroke.key == "escape" {
            self.dismiss(cx);
        }
    }
}

impl Focusable for UpdateNotice {
    fn focus_handle(&self, _cx: &App) -> FocusHandle {
        self.focus.clone()
    }
}

impl EventEmitter<UpdateNoticeEvent> for UpdateNotice {}

impl Render for UpdateNotice {
    fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
        let t = theme(cx);
        let bg = t.body().hsla();
        let text = t.text().hsla();
        let dim = t.dimmed().hsla();
        let pad = t.spacing(Size::Lg);
        let gap = t.spacing(Size::Xs);
        let headline_size = t.font_size(Size::Md);
        let small = t.font_size(Size::Xs);
        let (headline, detail) = self
            .outcome
            .lines(self.updater.app(), self.updater.version());

        div()
            .size_full()
            .flex()
            .flex_col()
            .track_focus(&self.focus)
            .on_key_down(cx.listener(Self::key_down))
            .bg(bg)
            .text_color(text)
            .pt(px(if self.window_root { TITLEBAR } else { pad }))
            .px(px(pad))
            .pb(px(pad))
            .gap(px(gap))
            .when(self.window_root, |this| this.child(drag_strip()))
            .child(
                div()
                    .text_size(px(headline_size))
                    .font_weight(FontWeight::BOLD)
                    .child(SharedString::from(headline)),
            )
            .child(
                div()
                    .text_size(px(small))
                    .text_color(dim)
                    .child(SharedString::from(detail)),
            )
            .child(div().flex_1())
            .child(
                div().flex().items_center().justify_end().child(
                    Button::new("guise-update-ok", "OK")
                        .variant(Variant::Filled)
                        .on_click(cx.listener(|this, _, _, cx| this.dismiss(cx))),
                ),
            )
            .probe("UpdateNotice")
    }
}

/// The strip along the top of an update window that drags it, kept clear of the
/// macOS traffic lights.
fn drag_strip() -> impl IntoElement {
    let lead = if cfg!(target_os = "macos") { 70.0 } else { 0.0 };
    div()
        .absolute()
        .top_0()
        .left(px(lead))
        .right_0()
        .h(px(TITLEBAR - 6.0))
        .window_control_area(WindowControlArea::Drag)
        .on_mouse_down(MouseButton::Left, |_, window, _| window.start_window_move())
}

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

    /// Every outcome names both what happened and why. A headline alone leaves
    /// someone who half-expected an update unsure the check even ran.
    #[test]
    fn every_outcome_says_what_happened_and_why() {
        for outcome in [
            UpdateOutcome::UpToDate,
            UpdateOutcome::Pending("1.32.0".into()),
            UpdateOutcome::Failed("network unreachable".into()),
        ] {
            let (headline, detail) = outcome.lines("Acme", "1.31.0");
            assert!(!headline.trim().is_empty());
            assert!(!detail.trim().is_empty());
        }
    }

    #[test]
    fn up_to_date_names_the_version_you_are_on() {
        let (_, detail) = UpdateOutcome::UpToDate.lines("Acme", "1.31.0");
        assert!(detail.contains("1.31.0"), "{detail}");
        assert!(detail.contains("Acme"), "{detail}");
    }

    /// A release still uploading must not read as "up to date" — that is the case
    /// [`UpdateOutcome::Pending`] exists to distinguish.
    #[test]
    fn a_pending_release_is_not_reported_as_up_to_date() {
        let (headline, detail) = UpdateOutcome::Pending("1.32.0".into()).lines("Acme", "1.31.0");
        assert!(headline.contains("1.32.0"), "{headline}");
        assert!(!headline.contains("up to date"), "{headline}");
        assert!(detail.contains("building"), "{detail}");
    }

    /// A failed check reports the reason rather than a generic apology.
    #[test]
    fn a_failed_check_surfaces_its_reason() {
        let (_, detail) =
            UpdateOutcome::Failed("network unreachable".into()).lines("Acme", "1.31.0");
        assert_eq!(detail, "network unreachable");
    }
}