// 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+\, through the IPC below.
    property bool present: true

    // 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
    WlrLayershell.layer: WlrLayer.Top
    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 wakeAt: 0
    property double lastLineAt: 0
    property double lastMonologueAt: 0
    property bool monologue: false

    // Bored, yawning, lying down at 1, 3 and 5 minutes. Inhibitors count,
    // so presentation mode keeps her awake. enabled is set explicitly: left
    // out, it read false on creation.
    IdleMonitor { id: idle1; enabled: true; respectInhibitors: true; timeout: 60 }
    IdleMonitor { id: idle2; enabled: true; respectInhibitors: true; timeout: 180 }
    IdleMonitor { id: idle3; enabled: true; respectInhibitors: true; timeout: 300 }
    readonly property int idle: 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") {
                    root.typingAt = t;
                } else if (what === "keystone-delete") {
                    root.typingAt = t;
                    if (Mood.mockAllowed(root.mockAt, t)) {
                        root.mockAt = t;
                        root.say("mock");
                    }
                }
            } else if (["fullscreen", "activewindowv2", "workspacev2"].includes(event.name)) {
                Hyprland.refreshToplevels();
                fsSettle.restart();
            }
        }
    }

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

    // 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, 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)
    // 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

    // --- 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());
        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 ----------------------------------------------

    function appear() {
        if (root.present) return;
        root.present = true;
        root.destructAt = 0;          // the skirt is back
        root.now = Date.now();
        greet.restart();
    }
    function dismiss() {
        if (!root.present) return;
        root.stopMonologue();
        bubble.hide();
        root.present = false;
    }
    // After the drop-in has landed.
    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() { if (root.present) root.dismiss(); else root.appear(); }
        function show() { root.appear(); }
        function hide() { root.dismiss(); }
    }

    // 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
        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 }
        }
    }
}