lernie 0.1.97

lernie: the operator seat — the window and wire client for a yog server
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//! **What an open dropup lists**: the rows this seat already holds, read at
//! once — the roster's walls, the providers read, one provider's models, the
//! levels — so the list stands before the refresh it posted has answered.

use super::{Choice, Model, Pick, Selector};

/// **The priority lane's word**, on the list and on the rule alike.
pub(crate) fn lane(on: bool) -> &'static str {
    if on { "on" } else { crate::verbs::tuning::OFF }
}

impl Model {
    /// **The open dropup's rows**, or none where nothing is open.
    pub fn choices(&self) -> Vec<Choice> {
        let Some(open) = &self.dropup else {
            return Vec::new();
        };
        let worker = self.worker();
        match open.selector {
            Selector::Workspace => self.walls(),
            Selector::Provider => self
                .providers
                .iter()
                .flatten()
                .map(|row| Choice {
                    text: row.name.clone(),
                    current: worker.is_some_and(|w| w.provider == row.name),
                    pick: Pick::Provider(row.name.clone()),
                })
                .collect(),
            Selector::Model => {
                let provider = open.provider.clone().unwrap_or_default();
                let mut ids = self.offered_by(&provider);
                // **What is in force is listed whether or not the listing
                // has come back**, so the list says where it stands now.
                if let Some(w) = worker.filter(|w| w.provider == provider)
                    && !ids.contains(&w.model)
                {
                    ids.insert(0, w.model.clone());
                }
                ids.into_iter()
                    .map(|id| Choice {
                        current: worker.is_some_and(|w| w.provider == provider && w.model == id),
                        text: id.clone(),
                        pick: Pick::Model(id),
                    })
                    .collect()
            }
            Selector::Effort => crate::verbs::tuning::levels()
                .into_iter()
                .map(|level| Choice {
                    text: crate::verbs::tuning::word(level.as_ref()),
                    current: worker.is_some_and(|w| w.effort == level),
                    pick: Pick::Effort(level),
                })
                .collect(),
            Selector::Priority => [true, false]
                .into_iter()
                .map(|on| Choice {
                    text: lane(on).to_owned(),
                    current: worker.is_some_and(|w| w.priority == on),
                    pick: Pick::Priority(on),
                })
                .collect(),
        }
    }

    /// **Every wall this seat can address**, in the roster's order — named
    /// with its engine where the seat reaches more than one — and last,
    /// `+ new workspace` under this box's own engine where it is held
    /// (DESIGN §4.44: the switcher's row, beside the choice it belongs to).
    fn walls(&self) -> Vec<Choice> {
        let many = self.roster.len() > 1;
        let found = self
            .roster
            .iter()
            .find(|chunk| {
                chunk.channel.name == crate::seat::OWN
                    && !matches!(chunk.held, crate::ui::Held::Unheld(_))
            })
            .map(|chunk| Choice {
                text: crate::ui::roster::engine::FOUND.to_owned(),
                current: false,
                pick: Pick::Found(chunk.channel.name.clone()),
            });
        self.roster
            .iter()
            .flat_map(|chunk| {
                chunk.walls.iter().filter_map(move |row| {
                    let address = chunk.channel.address(row)?;
                    let aim = super::Aim {
                        channel: chunk.channel.name.clone(),
                        address,
                    };
                    Some(Choice {
                        text: if many {
                            format!("{} · {}", row.workspace, chunk.channel.name)
                        } else {
                            row.workspace.clone()
                        },
                        current: self.aim.as_ref() == Some(&aim),
                        pick: Pick::Wall(aim),
                    })
                })
            })
            .chain(found)
            .collect()
    }
}