// 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.

import Quickshell
import Quickshell.Io
import Quickshell.Wayland
import Quickshell.Hyprland
import QtQuick
import ".."
import "../NotifyConfig.js" as NC
import "Mood.js" as Mood
import "Lines.js" as Lines

// The desktop companion: a chibi 2B in the bottom-right corner of the
// focused monitor. Inputs and timers live here, the decision in Mood.js,
// the drawing in Figure.qml. See README.md here and
// docs/superpowers/specs/2026-10-23-companion-design.md.
PanelWindow {
    id: root

    required property var asst

    readonly property string art: Quickshell.env("HOME") + "/.local/share/keystone/companion/2b/frames"

    // SUPER+\ (the IPC below) and the Companion settings page, through Prefs,
    // so it survives a restart.
    readonly property bool present: Prefs.ready && Prefs.companion
    onPresentChanged: {
        if (root.present) {
            root.destructAt = 0;          // the skirt is back
            root.now = Date.now();
            greet.restart();
        } else {
            root.stopMonologue();
        }
    }

    // The monitor she is on trails the focused one: a change plays her exit
    // here first, and only then moves the window (settled, below).
    readonly property string focused: Hyprland.focusedMonitor?.name ?? ""
    property string here: ""
    property bool hopping: false
    onFocusedChanged: {
        if (root.here === "") root.here = root.focused;
        else if (root.focused !== root.here) root.hopping = true;
    }
    Component.onCompleted: root.here = root.focused

    screen: Quickshell.screens.find(s => s.name === root.here) ?? Quickshell.screens[0]
    anchors { right: true; bottom: true }
    margins { right: 24; bottom: 16 }
    implicitWidth: 760
    implicitHeight: 260
    color: "transparent"
    exclusionMode: ExclusionMode.Ignore
    // Overlay, so she can sit above the other overlays (see remap below).
    WlrLayershell.layer: WlrLayer.Overlay
    WlrLayershell.namespace: "keystone-companion"
    WlrLayershell.keyboardFocus: WlrKeyboardFocus.None
    // Her body only: clicks anywhere else, the bubble included, reach the
    // window below. Out of view the region is empty.
    mask: Region { item: hit }

    // --- inputs ---------------------------------------------------------

    property double now: Date.now()
    Timer { interval: 200; repeat: true; running: root.present; onTriggered: root.now = Date.now() }

    property var clicks: ({ count: 0, at: 0 })
    property double destructAt: 0
    property bool dodging: false
    property double repliedAt: 0
    property double mockAt: 0
    property double typingAt: 0
    property double pulseAt: 0
    property double wakeAt: 0
    property double admireAt: 0
    property double lastLineAt: 0
    property double lastMonologueAt: 0
    property bool monologue: false
    property string appClass: ""

    // Bored, yawning, lying down at 20, 40 and 70% of the wscreensavers idle
    // timeout, so she has lain down a while before the saver covers her (1,
    // 2 and 3.5 minutes at its 5). Read live, so a change in its settings
    // follows; 5 minutes when the file is missing or unreadable.
    // Inhibitors are ignored, as wscreensavers ignores them: No lock holds
    // one for as long as it is on, which kept her awake for hours.
    // Presentation (and gaming) mode keeps her awake instead, by name.
    // enabled is set explicitly: left out, it read false on creation.
    FileView {
        id: saverConf
        path: Quickshell.env("HOME") + "/.config/wscreensavers/config.json"
        watchChanges: true
        onFileChanged: reload()
        printErrors: false
    }
    readonly property int saverIdle: {
        try {
            const m = JSON.parse(saverConf.text()).idleTimeoutMinutes;
            return m > 0 ? m * 60 : 300;
        } catch (e) {
            return 300;
        }
    }
    IdleMonitor { id: idle1; enabled: true; respectInhibitors: false; timeout: Math.round(root.saverIdle * 0.2) }
    IdleMonitor { id: idle2; enabled: true; respectInhibitors: false; timeout: Math.round(root.saverIdle * 0.4) }
    IdleMonitor { id: idle3; enabled: true; respectInhibitors: false; timeout: Math.round(root.saverIdle * 0.7) }
    readonly property int idle: Status.presentation ? 0 : idle3.isIdle ? 3 : idle2.isIdle ? 2 : idle1.isIdle ? 1 : 0
    property int wasIdle: 0
    onIdleChanged: {
        const t = Date.now();
        if (root.idle === 0 && root.wasIdle > 0) {
            root.wakeAt = t;
            root.say("wake");
        } else if (root.idle === 1 && root.wasIdle === 0) {
            if (Mood.monologue("bored", root.lastMonologueAt, t, Math.random())) root.startMonologue();
            else root.say("bored");
        }
        root.wasIdle = root.idle;
    }

    // 2 is real fullscreen; 1 is maximised, which is most windows here and
    // must not hide her. lastIpcObject is only current after a refresh, and
    // the island measured that it settles a moment after the event.
    property int fullscreen: 0
    Timer {
        id: fsSettle
        interval: 60
        onTriggered: root.fullscreen = Hyprland.activeToplevel?.lastIpcObject?.fullscreen ?? 0
    }

    Connections {
        target: Hyprland
        function onRawEvent(event) {
            if (event.name === "custom") {
                // From hypr-theme's sections/companion.lua.
                const what = event.data.trim();
                const t = Date.now();
                if (what === "keystone-typing") {
                    // Pulses come at most once a second, so a lone key (a
                    // shortcut, an arrow) is one pulse and typing is a run
                    // of them: she watches from the second within 2.5 s.
                    if (t - root.pulseAt < 2500) root.typingAt = t;
                    root.pulseAt = t;
                } else if (what === "keystone-delete") {
                    root.typingAt = t;
                    if (Mood.mockAllowed(root.mockAt, t)) {
                        root.mockAt = t;
                        root.say("mock");
                    }
                }
            } else if (event.name === "openlayer" && event.data.trim() !== "keystone-companion") {
                // Something mapped above her: the assistant's dim, rofi,
                // the keybind reminder. Map again, after it.
                root.remapping = true;
                remap.restart();
            } else if (event.name === "activewindow") {
                // "class,title". A remark now and then when focus moves to a
                // different program, under the usual 30 s line cooldown.
                // ponytail: one line per class, no frames of her own; add
                // per-app frames or title matching (a site in firefox) if
                // lines alone feel thin.
                const cls = event.data.split(",")[0].trim().toLowerCase();
                if (cls !== "" && cls !== root.appClass && Math.random() < 1 / 3) root.say("app:" + cls);
                root.appClass = cls;
            } else if (["fullscreen", "activewindowv2", "workspacev2", "closewindow"].includes(event.name)) {
                Hyprland.refreshToplevels();
                fsSettle.restart();
                admireSettle.restart();
            }
        }
    }

    Connections {
        target: root.asst
        function onReplied() {
            root.repliedAt = Date.now();
            root.say("ready");
        }
    }

    // A listed wallpaper on an empty workspace: she turns to it and blushes.
    // Checked after the events above (switching to an empty workspace,
    // closing its last window) and whenever she stops being away: shown,
    // back from a remap, a hop, a dodge or fullscreen. Toplevels settle a
    // moment after the event, as fullscreen does.
    onAwayChanged: if (!root.away) admireSettle.restart()
    Timer {
        id: admireSettle
        interval: 100
        onTriggered: {
            const t = Date.now();
            if (root.away || root.here !== root.focused || !Mood.admireAllowed(root.admireAt, t)) return;
            if ((Hyprland.focusedWorkspace?.toplevels.values.length ?? 1) !== 0) return;
            if (!Admired.listed(Admired.on(root.here))) return;
            root.admireAt = t;
            root.now = t;
            admireLine.restart();
        }
    }
    // The line comes with the blush, not the turn.
    Timer { id: admireLine; interval: Mood.T.admireLook; onTriggered: root.say("wallpaper") }

    // Hyprland stacks a later surface above an earlier one on the same layer
    // and 0.56.2 has no layer rule to order them, so the assistant canvas's
    // full-screen dim covered her and her think and wave were never seen.
    // Whenever another layer surface opens (openlayer, below), she unmaps
    // and maps again, after it. Unmapped she counts as away, so her figure
    // drops out unseen and plays its entrance once she is back: a vanish
    // and a hop in, rather than a flicker.
    property bool remapping: false
    visible: !root.remapping
    Timer { id: remap; interval: 400; onTriggered: root.remapping = false }

    // Balloons stack bottom-right of their screen. When that is her corner,
    // any balloon on screen shoves her left past the stack.
    readonly property bool shoved: {
        const place = Notify.config.balloons;
        if (place.screen !== root.here || place.corner !== "bottom-right") return false;
        return (Notify.queue || []).some(n => NC.shown(Notify.config, n, Notify.dnd,
            Notify.drawerOpen, Notify.snoozeUntil, root.now));
    }
    property double shovedAt: 0
    onShovedChanged: {
        root.shovedAt = root.shoved ? Date.now() : 0;
        if (root.shoved) root.say("shoved");
    }

    // --- state ----------------------------------------------------------

    readonly property var mood: Mood.pick({
        now: root.now, destructAt: root.destructAt, dodging: root.dodging, shoved: root.shoved,
        shovedAt: root.shovedAt,
        recording: root.asst.recording, busy: root.asst.busy, repliedAt: root.repliedAt,
        clicks: root.clicks, admireAt: root.admireAt, mockAt: root.mockAt, typingAt: root.typingAt, wakeAt: root.wakeAt,
        monologue: root.monologue, idle: root.idle,
    })
    readonly property string outfit: Mood.outfit(root.destructAt, root.now, Prefs.companionSkirtless * 1000)
    // Anything above the monologue cuts it short.
    onMoodChanged: if (root.monologue && root.mood.state !== "muse") root.stopMonologue()

    // Hidden: no sprite, no bubble. Away adds the dodge, which hides the
    // sprite but lets its line show.
    readonly property bool hidden: !root.present || root.fullscreen === 2 || root.hopping
    readonly property bool away: root.hidden || root.dodging || root.remapping

    // --- speech ---------------------------------------------------------

    function say(kind, force) {
        const t = Date.now();
        if (root.hidden || (!force && !Mood.canSpeak(root.lastLineAt, t))) return;
        const line = Lines.pick(kind, Math.random(), Prefs.companionApps);
        if (line === "") return;
        root.lastLineAt = t;
        bubble.show(line, 3000);
    }

    // The opening monologue: about 15 characters a second, one sentence
    // per bubble, 1.5 s between sentences, the last held 4 s.
    property int monoLine: 0
    function startMonologue() {
        if (root.hidden) return;
        root.monologue = true;
        root.lastMonologueAt = Date.now();
        root.lastLineAt = root.lastMonologueAt;
        root.monoLine = 0;
        typer.begin(Lines.monologue[0]);
    }
    function stopMonologue() {
        root.monologue = false;
        typer.stop();
        typerHold.stop();
        bubble.hide();
    }
    Timer {
        id: typer
        property string full: ""
        interval: 66
        repeat: true
        function begin(text) { typer.full = text; bubble.typed(""); typer.restart(); }
        onTriggered: {
            const n = bubble.text.length + 1;
            bubble.typed(typer.full.slice(0, n));
            if (n < typer.full.length) return;
            typer.stop();
            typerHold.interval = root.monoLine === Lines.monologue.length - 1 ? 4000 : 1500;
            typerHold.restart();
        }
    }
    Timer {
        id: typerHold
        onTriggered: {
            root.monoLine++;
            if (root.monoLine >= Lines.monologue.length) root.stopMonologue();
            else typer.begin(Lines.monologue[root.monoLine]);
        }
    }

    // --- clicks and the dodge -------------------------------------------

    function clicked() {
        const t = Date.now();
        root.now = t;
        root.clicks = Mood.click(root.clicks, t);
        if (root.clicks.count >= 7) {
            root.clicks = { count: 0, at: 0 };
            root.stopMonologue();
            root.destructAt = t;
            sprite.explode();
            root.say("destruct", true);
            aftermath.restart();
        } else if (root.clicks.count === 1) {
            root.say("click", true);
        } else if (root.clicks.count === 4) {
            root.say("blush", true);
        }
    }
    Timer { id: aftermath; interval: Mood.T.destruct + 400; onTriggered: root.say("aftermath", true) }

    // She cannot see the pointer coming, only feel it on her: Quickshell has
    // no global pointer and Hyprland sends no motion events. A click before
    // the 0.6 s still reaches her.
    Timer {
        id: hover
        interval: 600
        onTriggered: {
            if (Math.random() < 0.5) root.say("dodge");
            root.dodging = true;
            dodgeBack.restart();
        }
    }
    Timer { id: dodgeBack; interval: 5000; onTriggered: root.dodging = false }

    // --- showing and hiding ----------------------------------------------

    // After the drop-in has landed, on every appearance, the one at login
    // included.
    Timer {
        id: greet
        interval: 450
        onTriggered: {
            if (Mood.monologue("shown", root.lastMonologueAt, Date.now(), Math.random())) root.startMonologue();
            else root.say("shown", true);
        }
    }

    //   qs -p <desktop> ipc call companion toggle     -> SUPER+\
    IpcHandler {
        target: "companion"
        function toggle() { Prefs.setCompanion(!Prefs.companion); }
        function show() { Prefs.setCompanion(true); }
        function hide() { Prefs.setCompanion(false); }
    }

    // The exit has played on the old monitor: move, and the entrance plays.
    function settled(out) {
        if (out && root.hopping) {
            root.here = root.focused;
            root.hopping = false;
        }
    }

    // --- drawing --------------------------------------------------------

    // Where she stands: the bottom-right of the window, or left of the
    // balloon stack. 336 = the stack's 340 px plus its 12 px margin
    // (notifications/Balloons.qml), minus this window's 24 px right margin,
    // plus 8 px of air.
    Item {
        id: seat
        width: sprite.width
        height: sprite.height
        anchors.bottom: parent.bottom
        x: root.width - width - (root.shoved ? 336 : 0)
        Behavior on x { NumberAnimation { duration: 260; easing.type: Easing.OutCubic } }
    }

    Figure {
        id: sprite
        x: seat.x
        y: seat.y
        source: `file://${root.art}/${root.outfit}/${root.mood.frame}.png`
        fallback: `file://${root.art}/${root.outfit}/base.png`
        out: root.away
        trembling: root.mood.state === "admire" && root.mood.frame === "blush3"
        onSettled: out => root.settled(out)
    }

    Item {
        id: hit
        x: sprite.x
        y: sprite.y
        width: root.away ? 0 : sprite.width
        height: root.away ? 0 : sprite.height
        MouseArea {
            anchors.fill: parent
            hoverEnabled: true
            cursorShape: Qt.PointingHandCursor
            onEntered: hover.restart()
            onExited: hover.stop()
            onClicked: { hover.stop(); root.clicked(); }
        }
    }

    // Up and to the left of her head, anchored to where she stands rather
    // than to the sprite, so a dodge line stays where she was.
    Rectangle {
        id: bubble
        property alias text: label.text
        function show(t, ms) { label.text = t; bubble.opacity = 1; hideTimer.interval = ms; hideTimer.restart(); }
        function typed(t) { label.text = t; bubble.opacity = 1; hideTimer.stop(); }
        function hide() { hideTimer.stop(); bubble.opacity = 0; }

        visible: !root.hidden && opacity > 0 && label.text !== ""
        anchors { right: seat.left; rightMargin: -14; bottom: seat.top; bottomMargin: -22 }
        width: Math.min(260, label.implicitWidth + 24)
        height: label.implicitHeight + 16
        radius: 12
        color: Qt.alpha(Theme.base, 0.92)
        border { width: 1; color: Qt.alpha(Theme.text, 0.25) }
        opacity: 0
        Behavior on opacity { NumberAnimation { duration: 180 } }

        Timer { id: hideTimer; onTriggered: bubble.opacity = 0 }

        Text {
            id: label
            anchors.centerIn: parent
            width: Math.min(236, implicitWidth)
            wrapMode: Text.WordWrap
            color: Theme.text
            font { family: Theme.fontFamily; pixelSize: 13 }
        }
        Rectangle {
            width: 10; height: 10; rotation: 45
            color: bubble.color
            anchors { right: parent.right; rightMargin: 18; bottom: parent.bottom; bottomMargin: -5 }
        }
    }
}