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// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
pragma Singleton
import Quickshell
import QtQuick
import "../.."
import "Shuffle.js" as Shuffle
// The wallpaper engine: both wallpapers on a timer, from a list per screen
// picked with the heart in the picker. Ticks go through Wallpapers.run like
// Apply, so the burn plays, but as the light run: udt-accent leaves GRUB, the
// homepage and SDDM alone. Each screen has a home, the wallpaper last chosen
// for it by hand, and switching off goes back to it with a full run, so those
// three match the desktop again. See the spec,
// docs/superpowers/specs/2026-10-29-wallpaper-engine-design.md.
Singleton {
id: root
readonly property var cfg: Prefs.wallEngine
readonly property bool on: cfg.on
function list(which) { return which === "V" ? cfg.v : cfg.h; }
function listed(path, which) { return list(which).indexOf(path) >= 0; }
// A gallery folder by its Wallpapers.groups key, "" for the hearted list.
function folder(which) { return which === "V" ? cfg.folderV : cfg.folderH; }
// What a tick draws from. A folder that is no longer in the gallery
// gives nothing, so that screen is left alone rather than falling back
// to the list behind the user's back.
function pool(which) {
const key = folder(which);
if (key === "") return list(which).filter(present);
const g = Wallpapers.groups.find(g => g.key === key);
return g ? g.files : [];
}
// ponytail: present means in the gallery's last scan, so a file deleted
// since stays drawable until a rescan, and wallp then skips it.
function present(path) { return Wallpapers.files.indexOf(path) >= 0; }
function toggle(path, which) {
const l = list(which).slice();
const i = l.indexOf(path);
if (i >= 0) l.splice(i, 1);
else l.push(path);
Prefs.setWallEngine(which === "V" ? { v: l } : { h: l });
}
function setOn(v) {
if (v === on) return;
if (v) {
Prefs.setWallEngine({ on: true, homeH: Wallpapers.currentH, homeV: Wallpapers.currentV });
} else {
Prefs.setWallEngine({ on: false });
goHome();
}
}
// The page's draft, like every settings page: the interval and the two
// sources change here and reach Prefs on Start or Apply. Reset binds
// them back to what is saved. Hearts are not drafted: the picker writes
// them as they are clicked.
property int draftMinutes: cfg.minutes
property string draftFolderH: cfg.folderH
property string draftFolderV: cfg.folderV
readonly property bool dirty: draftMinutes !== cfg.minutes
|| draftFolderH !== cfg.folderH || draftFolderV !== cfg.folderV
function draftFolder(which) { return which === "V" ? draftFolderV : draftFolderH; }
function setDraftFolder(which, key) {
if (which === "V") draftFolderV = key;
else draftFolderH = key;
}
function setDraftMinutes(m) {
if (Number.isInteger(m) && m >= 1) draftMinutes = m;
}
function reset() {
draftMinutes = Qt.binding(() => cfg.minutes);
draftFolderH = Qt.binding(() => cfg.folderH);
draftFolderV = Qt.binding(() => cfg.folderV);
}
function commit() {
Prefs.setWallEngine({ minutes: draftMinutes, folderH: draftFolderH, folderV: draftFolderV });
reset();
}
// Start changes the wallpapers at once: the first timer change would
// otherwise be a whole interval away, which read as the engine not
// working.
function start() {
commit();
setOn(true);
next();
}
function apply() {
commit();
restartTimer();
}
function stop() { setOn(false); }
// ponytail: in memory, so a restart starts a new round.
property var bagH: []
property var bagV: []
// A screen whose list is empty, or whose pick is already up, is left out.
function tick() {
if (Wallpapers.applying) return;
const h = Shuffle.draw(pool("H"), bagH, Wallpapers.currentH);
const v = Shuffle.draw(pool("V"), bagV, Wallpapers.currentV);
const ph = h.pick !== Wallpapers.currentH ? h.pick : "";
const pv = v.pick !== Wallpapers.currentV ? v.pick : "";
if (Wallpapers.run(ph, pv, "tick")) {
bagH = h.bag;
bagV = v.bag;
}
}
function next() {
tick();
restartTimer();
}
// When the timer next fires, for the page's header; 0 while off. Timer
// has no such property, so it is kept beside it.
property double nextAt: 0
function restartTimer() {
timer.restart();
nextAt = Date.now() + timer.interval;
}
// A switch-off during a run cannot start its own; it goes when that run
// finishes.
property bool homeWaiting: false
function goHome() {
const h = cfg.homeH !== Wallpapers.currentH ? cfg.homeH : "";
const v = cfg.homeV !== Wallpapers.currentV ? cfg.homeV : "";
if (h === "" && v === "") return;
homeWaiting = !Wallpapers.run(h, v, "home");
}
Timer {
id: timer
interval: root.cfg.minutes * 60000
repeat: true
running: root.on
onTriggered: { root.nextAt = Date.now() + interval; root.tick(); }
// A running Timer restarts on a new interval.
onIntervalChanged: if (running) root.nextAt = Date.now() + interval
onRunningChanged: root.nextAt = running ? Date.now() + interval : 0
}
Connections {
target: Wallpapers
// A pick by hand is the new home, and stays up a full interval.
function onManualApplied(h, v) {
if (!root.on) return;
Prefs.setWallEngine({ homeH: h !== "" ? h : root.cfg.homeH,
homeV: v !== "" ? v : root.cfg.homeV });
root.restartTimer();
}
function onFinished() {
if (!root.homeWaiting || root.on) return;
root.homeWaiting = false;
root.goHome();
}
}
}
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