// 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.Services.Pipewire
import QtQuick
import "../.."

Column {
    id: page

    required property var service
    signal back

    spacing: 16

    // A device's human name, most readable first.
    function devLabel(n) {
        if (!n) return "—";
        return n.description || n.nickname || n.name || ("node " + n.id);
    }

    // The state glyph for a level row, the same shapes the OSD uses: a
    // microphone for the input, a speaker whose fill follows the level for the
    // output, red when muted.
    function stateIcon(audio, input) {
        if (input) return audio?.muted ? "\uf131" : "\uf130";
        if (!audio || audio.muted || audio.volume <= 0) return "\uf026";
        return audio.volume < 0.5 ? "\uf027" : "\uf028";
    }

    // The meter. The hit area is taller than the 8px bar so it is easy to
    // grab; preventStealing stops the page's Flickable taking the press, and
    // the wheel is accepted here so the page does not scroll instead. Click
    // sets, drag scrubs, wheel steps, wheel-up unmutes (the same thing the
    // volume keybind does). Past 100% a tick marks where boost starts.
    component Meter: Item {
        id: meter

        property var audio: null
        property real max: 1
        readonly property real level: Math.min((audio?.volume ?? 0) / max, 1)

        width: parent.width
        height: 20

        Rectangle {
            anchors.verticalCenter: parent.verticalCenter
            width: parent.width
            height: 8
            radius: 4
            color: Theme.surface

            Rectangle {
                height: parent.height
                radius: parent.radius
                width: parent.width * meter.level
                color: meter.audio?.muted ? Theme.red : Theme.accent
                opacity: meter.audio?.muted ? 0.5 : 1
            }
        }

        Rectangle {
            visible: meter.max > 1
            anchors.verticalCenter: parent.verticalCenter
            x: parent.width / meter.max - 1
            width: 2
            height: 14
            radius: 1
            color: Theme.overlay
        }

        MouseArea {
            anchors.fill: parent
            enabled: meter.audio !== null
            preventStealing: true
            cursorShape: Qt.PointingHandCursor

            onPressed: mouse => set(mouse.x)
            onPositionChanged: mouse => { if (pressed) set(mouse.x); }

            // Wheel-up never lowers: a level already past max (set by
            // something else) stays where it is rather than snapping down.
            onWheel: wheel => {
                const a = meter.audio;
                if (!a || wheel.angleDelta.y === 0) return;
                if (wheel.angleDelta.y > 0) {
                    a.muted = false;
                    a.volume = Math.max(a.volume, Math.min(meter.max, a.volume + 0.05));
                } else {
                    a.volume = Math.max(0, a.volume - 0.05);
                }
                wheel.accepted = true;
            }

            function set(x) {
                if (meter.audio) meter.audio.volume = Math.max(0, Math.min(meter.max, x / width * meter.max));
            }
        }
    }

    // Output and input. Each shows the current device, a slider for it, and an
    // in-place device list that sets the default. The list expands within the
    // page rather than opening a popup: a QtQuick.Controls popup is a separate
    // window and does not position reliably on this layer surface.
    Repeater {
        model: [
            { label: "Output", node: page.service.sink, devices: page.service.outputs,
              setDefault: n => Pipewire.preferredDefaultAudioSink = n },
            { label: "Input", node: page.service.source, devices: page.service.inputs,
              setDefault: n => Pipewire.preferredDefaultAudioSource = n },
        ]

        Column {
            id: section
            required property var modelData
            readonly property var audio: modelData.node?.audio ?? null
            property bool expanded: false

            width: page.width
            spacing: 6

            Item {
                width: parent.width
                implicitHeight: name.implicitHeight

                Text {
                    id: name
                    anchors.left: parent.left
                    text: modelData.label
                    font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 1; bold: true }
                    color: Theme.text
                }

                // State glyph and level, clickable to mute/unmute.
                Row {
                    id: levelRow
                    anchors { right: parent.right; verticalCenter: parent.verticalCenter }
                    spacing: 6

                    Text {
                        anchors.verticalCenter: parent.verticalCenter
                        text: page.stateIcon(audio, modelData.label === "Input")
                        font { family: Theme.iconFamily; pixelSize: Theme.fontSize }
                        color: audio?.muted ? Theme.red : Theme.accent
                    }

                    Text {
                        anchors.verticalCenter: parent.verticalCenter
                        text: !audio ? "—" : audio.muted ? "muted" : Math.round(audio.volume * 100) + "%"
                        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 1 }
                        color: audio?.muted ? Theme.red : Theme.subtext
                    }
                }

                MouseArea {
                    anchors.fill: levelRow
                    enabled: audio !== null
                    cursorShape: Qt.PointingHandCursor
                    onClicked: if (audio) audio.muted = !audio.muted
                }
            }

            // The current device; click to open the device list.
            Item {
                width: parent.width
                implicitHeight: devRow.implicitHeight

                Row {
                    id: devRow
                    width: parent.width
                    spacing: 6

                    Text {
                        width: parent.width - chevron.implicitWidth - parent.spacing
                        elide: Text.ElideRight
                        text: page.devLabel(modelData.node)
                        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 2 }
                        color: Theme.text
                    }

                    Text {
                        id: chevron
                        text: section.expanded ? "\uf077" : "\uf078"
                        font { family: Theme.iconFamily; pixelSize: Theme.fontSize - 4 }
                        color: Theme.overlay
                    }
                }

                MouseArea {
                    anchors.fill: parent
                    cursorShape: Qt.PointingHandCursor
                    onClicked: section.expanded = !section.expanded
                }
            }

            // The devices, expanded in place. The current one is highlighted;
            // clicking a row makes it the default and folds the list away.
            Column {
                width: parent.width
                spacing: 2
                visible: section.expanded

                Repeater {
                    model: section.modelData.devices

                    Rectangle {
                        required property var modelData
                        readonly property bool current: section.modelData.node === modelData

                        width: section.width
                        implicitHeight: devText.implicitHeight + 8
                        radius: 6
                        color: devArea.containsMouse ? Qt.alpha(Theme.accent, 0.18)
                             : current ? Qt.alpha(Theme.accent, 0.10) : "transparent"

                        Text {
                            id: devText
                            anchors {
                                left: parent.left; right: parent.right
                                verticalCenter: parent.verticalCenter
                                leftMargin: 8; rightMargin: 8
                            }
                            elide: Text.ElideRight
                            text: page.devLabel(modelData)
                            font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 3; bold: current }
                            color: current ? Theme.accent : Theme.text
                        }

                        MouseArea {
                            id: devArea
                            anchors.fill: parent
                            hoverEnabled: true
                            cursorShape: Qt.PointingHandCursor
                            onClicked: {
                                section.modelData.setDefault(modelData);
                                section.expanded = false;
                            }
                        }
                    }
                }
            }

            Meter {
                audio: section.audio
                // Output goes to 150%, the ceiling the volume keybind already
                // uses (wpctl -l 1.5). A boosted microphone only clips.
                max: section.modelData.label === "Output" ? 1.5 : 1
            }
        }
    }

    // Applications playing right now, each with its own level. Playback
    // streams only: a recording stream is the privacy dot's business. Nothing
    // binds these outside the page, so the tracker lives here and stops when
    // the drawer closes.
    PwObjectTracker { objects: page.service.streams }

    Column {
        width: parent.width
        spacing: 10
        visible: page.service.streams.length > 0

        Text {
            text: "Applications"
            font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 1; bold: true }
            color: Theme.text
        }

        Repeater {
            model: page.service.streams

            Column {
                id: stream
                required property var modelData
                readonly property var audio: modelData.audio

                width: page.width
                spacing: 2

                Item {
                    width: parent.width
                    implicitHeight: appName.implicitHeight

                    Text {
                        id: appName
                        anchors { left: parent.left; right: appLevel.left; rightMargin: 8 }
                        elide: Text.ElideRight
                        text: stream.modelData.properties?.["application.name"] || page.devLabel(stream.modelData)
                        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 2 }
                        color: Theme.text
                    }

                    Text {
                        id: appLevel
                        anchors { right: parent.right; verticalCenter: parent.verticalCenter }
                        text: stream.audio.muted ? "muted" : Math.round(stream.audio.volume * 100) + "%"
                        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 2 }
                        color: stream.audio.muted ? Theme.red : Theme.subtext

                        MouseArea {
                            anchors.fill: parent
                            cursorShape: Qt.PointingHandCursor
                            onClicked: stream.audio.muted = !stream.audio.muted
                        }
                    }
                }

                // What the app is playing, when it says: two browser tabs are
                // otherwise two identical rows.
                Text {
                    width: parent.width
                    visible: text !== ""
                    elide: Text.ElideRight
                    text: stream.modelData.properties?.["media.name"] ?? ""
                    font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
                    color: Theme.subtext
                }

                Meter { audio: stream.audio }
            }
        }
    }
}