cydonia 0.1.6

//! The question asked before a board is made: what to call it, and the key its
//! cards will carry.
//!
//! Asked rather than assumed. A board is keyed for as long as it exists — the
//! handles already written down go on meaning the cards they meant — so the one
//! moment the key is free is the moment before there are any, and that is this
//! one.

use crate::view::root::Cydonia;
use artifact::board::{self, key};
use bezel::{
    gpui::{
        self, AnyElement, App, Context, Entity, Focusable as _, KeyBinding, SharedString,
        Subscription, Window, actions, div, prelude::*, px,
    },
    theme::{TextStyle, Theme, Typeset},
    ui::{
        input::{FieldEvent, TextField},
        widgets::{ButtonStyle, Buttons, Scaffolding as _},
    },
};
use std::collections::HashSet;

actions!(cydonia_create, [CommitBoard, DismissBoard]);

/// Claimed on the dialog's fields, so `enter` makes the board.
const CREATE_CONTEXT: &str = "CydoniaNewBoard";

/// How wide the labels run, so the two fields start on one edge. The identity
/// panel's measure — the dialog asks for the same two things.
const LABEL_WIDTH: f32 = 34.;

pub fn bindings() -> Vec<KeyBinding> {
    vec![
        KeyBinding::new("enter", CommitBoard, Some(CREATE_CONTEXT)),
        KeyBinding::new("escape", DismissBoard, Some(CREATE_CONTEXT)),
    ]
}

/// A board that has been asked for and not yet made. Nothing is on disk until
/// Create: dismissing leaves the project as it was.
pub(crate) struct Making {
    /// Which project it lands in. Carried rather than taken from whichever is
    /// active, so the dialog makes the board under the heading its `+` was
    /// pressed on.
    pub project: usize,
    pub name: Entity<TextField>,
    pub key: Entity<TextField>,
    /// The key as last derived from the name. While the field still holds it
    /// the key follows what is being typed; the moment it is typed over, it is
    /// the person's and stays put.
    pub derived: SharedString,
    /// What was wrong last time. Keeps the dialog open: a taken key is a thing
    /// to fix, not to be told about afterwards.
    pub error: Option<SharedString>,
    /// Holds the name field's subscription for as long as the dialog is up.
    _watch: Subscription,
}

/// One of the dialog's fields, holding what it opens with.
fn seed(content: SharedString, placeholder: &'static str, cx: &mut App) -> Entity<TextField> {
    let field = cx.new(|cx| {
        TextField::new(cx)
            .with_key_context(CREATE_CONTEXT)
            .with_placeholder(placeholder)
    });
    field.update(cx, |field, cx| field.set_content(content, cx));
    field
}

impl Cydonia {
    /// Raise the question. Every New Board comes through here — the sidebar's
    /// `+` and the menu bar both — so a board is never made unnamed.
    pub(crate) fn ask_new_board(
        &mut self,
        project: usize,
        window: &mut Window,
        cx: &mut Context<Self>,
    ) {
        self.commit(cx);
        // One editor at a time, as [`Cydonia::open_info`] keeps it.
        self.menu = None;
        self.renaming = None;
        self.info = None;
        let derived = self.derived_key(project, "", cx);
        let name = seed(SharedString::default(), "name this board…", cx);
        let key = seed(derived.clone(), "KEY", cx);
        // Subscribed rather than observed: a field notifies on its own caret
        // blink, and the key would be rederived twice a second.
        let watch = cx.subscribe(&name, |this, field, event: &FieldEvent, cx| {
            if *event == FieldEvent::Changed {
                let typed = field.read(cx).content().clone();
                this.follow_key(&typed, cx);
            }
        });
        window.focus(&name.read(cx).focus_handle(cx), cx);
        self.making = Some(Making {
            project,
            name,
            key,
            derived,
            error: None,
            _watch: watch,
        });
        cx.notify();
    }

    /// Keep the key following the name, for as long as the key is still the
    /// one this put there.
    fn follow_key(&mut self, name: &str, cx: &mut Context<Self>) {
        let Some((project, field)) = self.making.as_ref().and_then(|making| {
            (making.key.read(cx).content() == &making.derived)
                .then(|| (making.project, making.key.clone()))
        }) else {
            return;
        };
        let derived = self.derived_key(project, name, cx);
        field.update(cx, |field, cx| field.set_content(derived.clone(), cx));
        if let Some(making) = self.making.as_mut() {
            making.derived = derived;
        }
    }

    /// The key a board of this name would take in this project, clear of the
    /// keys its neighbours hold. A board still unnamed is keyed off the name it
    /// would be filed under, so the field never stands empty or shows the
    /// fallback for a name nobody has typed yet.
    fn derived_key(&self, project: usize, name: &str, cx: &App) -> SharedString {
        let taken: HashSet<String> = self
            .workspace
            .read(cx)
            .projects
            .get(project)
            .map(|open| open.boards.iter().map(|board| board.key.clone()).collect())
            .unwrap_or_default();
        let name = match name.trim().is_empty() {
            true => board::NAMED,
            false => name.trim(),
        };
        key::derive(name, &taken).into()
    }

    pub(crate) fn make_board(&mut self, _: &CommitBoard, _: &mut Window, cx: &mut Context<Self>) {
        let Some(making) = self.making.as_ref() else {
            return;
        };
        let project = making.project;
        let key = making.key.read(cx).content().trim().to_owned();
        // A board left unnamed is the one the old `+` made outright — see
        // [`board::NAMED`]. Nothing else in the sidebar would tell them apart.
        let name = match making.name.read(cx).content().trim() {
            "" => board::NAMED.to_owned(),
            typed => typed.to_owned(),
        };
        let made = self.workspace.update(cx, |workspace, cx| {
            workspace.new_board(project, name, &key, cx)
        });
        match made {
            Ok(ix) => {
                self.making = None;
                self.open_board(project, ix, cx);
            }
            // Left open, holding what was typed.
            Err(why) => {
                if let Some(making) = self.making.as_mut() {
                    making.error = Some(why.into());
                }
            }
        }
        cx.notify();
    }

    pub(crate) fn dismiss_new_board(
        &mut self,
        _: &DismissBoard,
        _: &mut Window,
        cx: &mut Context<Self>,
    ) {
        self.making = None;
        cx.notify();
    }

    /// The dialog, over a scrim that takes the press dismissing it — the same
    /// shape the delete question is asked in.
    pub(crate) fn new_board_dialog(&self, cx: &mut Context<Self>) -> Option<AnyElement> {
        let making = self.making.as_ref()?;
        let theme = Theme::of(cx).clone();
        Some(
            div()
                .id("new-board-scrim")
                .absolute()
                .inset_0()
                .flex()
                .items_center()
                .justify_center()
                .bg(theme.scrim())
                .on_click(cx.listener(|this, _, window, cx| {
                    this.dismiss_new_board(&DismissBoard, window, cx)
                }))
                .child(
                    div()
                        .id("new-board-dialog")
                        .w(px(360.))
                        .flex()
                        .flex_col()
                        .gap(px(10.))
                        .p(px(20.))
                        .rounded(px(Theme::panel_radius()))
                        .border_1()
                        .border_color(theme.border)
                        .bg(theme.surface)
                        // The press that answers must not reach the scrim.
                        .on_click(|_, _, cx| cx.stop_propagation())
                        .child(theme.row_title("New board"))
                        .child(self.field_row("Name", making.name.clone(), cx))
                        .child(self.field_row("Key", making.key.clone(), cx))
                        // Only on an error: a standing hint would caption two
                        // labelled fields, and any example would name another
                        // board.
                        .children(making.error.clone().map(|why| {
                            div()
                                .text_style(TextStyle::Caption)
                                .text_color(theme.danger)
                                .child(why)
                        }))
                        .child(
                            div()
                                .mt(px(4.))
                                .flex()
                                .flex_row()
                                .justify_end()
                                .gap(px(8.))
                                .child(
                                    theme
                                        .button("Cancel", ButtonStyle::Ghost, None)
                                        .id("new-board-cancel")
                                        .on_click(cx.listener(|this, _, window, cx| {
                                            this.dismiss_new_board(&DismissBoard, window, cx)
                                        })),
                                )
                                .child(
                                    theme
                                        .button("Create", ButtonStyle::Prominent, None)
                                        .id("new-board-create")
                                        .on_click(cx.listener(|this, _, window, cx| {
                                            this.make_board(&CommitBoard, window, cx)
                                        })),
                                ),
                        ),
                )
                .into_any_element(),
        )
    }

    /// A labelled field, on the identity panel's measure.
    fn field_row(&self, label: &str, field: Entity<TextField>, cx: &Context<Self>) -> AnyElement {
        let theme = Theme::of(cx).clone();
        div()
            .flex()
            .flex_row()
            .items_center()
            .gap(px(8.))
            .child(
                div()
                    .flex_none()
                    .w(px(LABEL_WIDTH))
                    .text_style(TextStyle::Caption)
                    .text_color(theme.text_muted)
                    .child(label.to_owned()),
            )
            .child(div().flex_1().min_w_0().child(field))
            .into_any_element()
    }
}