pragma ComponentBehavior: Bound

import Quickshell
import Quickshell.Io
import QtQuick
import QtQuick.Layouts
import qs.hyprchrome.theme
import qs.hyprchrome.widgets.panels

// Host identity in the hyprchrome panel chrome: the machine's name set large,
// with its timezone and the current date and time.
//
// Expanded: name on the left, clock stack on the right.
// Collapsed: name, time and zone abbreviation on the header line.
//
// The name and the zone come from one shell call at startup — neither changes
// while the shell runs, so there is nothing to poll. The clock is a plain
// Timer; `now` is the single source both densities read, so they always agree
// down to the second.
BarPanel {
    id: panel

    panelId: "HST"
    title: "HOST"
    meta: panel.zoneAbbrev

    property string hostName: "LOCAL"
    property string zoneName: ""          // IANA, e.g. EUROPE/BERLIN
    property string userName: ""         // whoever is logged in, e.g. DARMAN
    property string localIp: ""          // interface holding the default route
    property string tailnetIp: ""        // tailscale0, when the tailnet is up
    property date now: new Date()

    // Qt resolves the abbreviation ("CEST") against the same zone the offset
    // comes from, so the two can never disagree.
    readonly property string zoneAbbrev: Qt.formatDateTime(panel.now, "t")
    readonly property string utcOffset: {
        const hours = -panel.now.getTimezoneOffset() / 60;
        return "UTC" + (hours >= 0 ? "+" : "") + (Number.isInteger(hours) ? hours : hours.toFixed(1));
    }

    function two(value) {
        return value < 10 ? "0" + value : String(value);
    }

    function timeText(value) {
        return panel.two(value.getHours()) + ":" + panel.two(value.getMinutes()) + ":" + panel.two(value.getSeconds());
    }

    function dateText(value) {
        const days = ["SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"];
        const months = ["JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"];
        return days[value.getDay()] + " // " + panel.two(value.getDate()) + " " + months[value.getMonth()] + " " + value.getFullYear();
    }

    Timer {
        interval: 1000
        running: true
        repeat: true
        triggeredOnStart: true
        onTriggered: panel.now = new Date()
    }

    Process {
        running: true

        // /etc/localtime is a symlink into the zoneinfo tree; its tail is the
        // IANA name, which no environment variable reliably carries.
        command: ["sh", "-c", "cat /proc/sys/kernel/hostname; readlink -f /etc/localtime; id -un"]

        stdout: StdioCollector {
            onStreamFinished: {
                const lines = this.text.trim().split("\n");
                if (lines.length > 0 && lines[0].trim().length > 0)
                    panel.hostName = lines[0].trim().toUpperCase();
                if (lines.length > 1) {
                    const zone = lines[1].match(/zoneinfo\/(.+)$/);
                    if (zone)
                        panel.zoneName = zone[1].toUpperCase();
                }
                if (lines.length > 2 && lines[2].trim().length > 0)
                    panel.userName = lines[2].trim().toUpperCase();
            }
        }
    }

    // Addresses, unlike the name and the zone, can change under a running
    // shell — a lease renewal, `tailscale up`/`down` — so this one polls.
    //
    // The local address is taken from the interface carrying the default
    // route, with tailscale0 excluded: as an exit node it holds the default
    // route itself, and the panel would then show the tailnet address twice.
    Process {
        id: addresses

        command: ["sh", "-c",
            "dev=$(ip -4 route show default | grep -v tailscale0 | awk '{print $5; exit}');"
            + " ip -4 -o addr show dev \"$dev\" scope global 2>/dev/null | awk '{split($4,a,\"/\"); print a[1]; exit}';"
            + " ip -4 -o addr show dev tailscale0 scope global 2>/dev/null | awk '{split($4,a,\"/\"); print a[1]; exit}'"]

        stdout: StdioCollector {
            onStreamFinished: {
                const lines = this.text.trim().split("\n");
                panel.localIp = lines.length > 0 ? lines[0].trim() : "";
                panel.tailnetIp = lines.length > 1 ? lines[1].trim() : "";
            }
        }
    }

    Timer {
        interval: 30000
        running: true
        repeat: true
        triggeredOnStart: true
        onTriggered: {
            if (!addresses.running)
                addresses.running = true;
        }
    }

    // Collapsed: who and when, nothing else.
    summary: Row {
        spacing: 10

        Text {
            id: hostLabel

            text: panel.hostName
            color: Theme.text
            font.family: Theme.displayFont
            font.pixelSize: 13
            font.bold: true
            font.letterSpacing: 1.2
        }

        // The pieces are set at two sizes. A Row positions its children at the
        // top and has no item alignment of its own (that is Grid), and a
        // vertical anchor inside a positioner is ignored — so the smaller
        // pieces take the tallest one's height and centre their text in it.
        Text {
            text: panel.timeText(panel.now)
            color: Theme.accent
            font.family: Theme.displayFont
            font.pixelSize: 13
            font.bold: true
            height: hostLabel.implicitHeight
            verticalAlignment: Text.AlignVCenter
        }

        Text {
            text: panel.dateText(panel.now)
            color: Theme.text
            font.family: Theme.microFont
            font.pixelSize: 11
            height: hostLabel.implicitHeight
            verticalAlignment: Text.AlignVCenter
        }

        Text {
            text: panel.zoneAbbrev
            color: Theme.muted
            font.family: Theme.microFont
            font.pixelSize: 11
            height: hostLabel.implicitHeight
            verticalAlignment: Text.AlignVCenter
        }
    }

    // Expanded: name left, clock stack right.
    RowLayout {
        width: parent.width
        // No explicit height: a third line in the identity column has to grow
        // the panel, and BarPanel measures the body to decide how tall it is.
        spacing: 16

        Column {
            Layout.fillWidth: true
            Layout.fillHeight: true

            Text {
                id: hostText

                text: panel.hostName
                color: Theme.text
                font.family: Theme.displayFont
                font.pixelSize: 25
                font.bold: true
                font.letterSpacing: 2
                elide: Text.ElideRight
            }

            Text {
                text: (panel.userName || "NODE") + " // " + (panel.zoneName || "LOCAL")
                color: Theme.accent
                font.family: Theme.microFont
                font.pixelSize: 9
                font.letterSpacing: 1.4
                elide: Text.ElideRight
            }

            Text {
                text: (panel.localIp || "--") + " // " + (panel.tailnetIp || "NO TAILNET")
                color: Theme.muted
                font.family: Theme.microFont
                font.pixelSize: 9
                font.letterSpacing: 1.4
                elide: Text.ElideRight
            }
        }

        // Rule between identity and clock, the same hairline the dense bar
        // puts between its host name and node readout.
        Rectangle {
            // The layout owns x/y/width/height: the 8px inset that was
            // `height: parent.height - 8` becomes margins, and a bare `width: 2`
            // would be overridden.
            Layout.preferredWidth: 2
            Layout.fillHeight: true
            Layout.topMargin: 4
            Layout.bottomMargin: 4
            color: Theme.hair
        }

        Column {
            id: clock

            // Both columns share the width evenly, as before. `width: 210` here was
            // dead — a layout assigns width — and `Layout.alignment` is ignored
            // while an item fills.
            Layout.fillWidth: true
            Layout.fillHeight: true

            spacing: 2

            Text {
                width: parent.width
                text: panel.timeText(panel.now)
                horizontalAlignment: Text.AlignRight
                color: Theme.text
                font.family: Theme.displayFont
                font.pixelSize: 18
                font.bold: true
                font.letterSpacing: 1
            }

            Text {
                width: parent.width
                text: panel.dateText(panel.now)
                horizontalAlignment: Text.AlignRight
                color: Theme.accent
                font.family: Theme.microFont
                font.pixelSize: 11
            }

            Text {
                width: parent.width
                text: panel.zoneAbbrev + " // " + panel.utcOffset
                horizontalAlignment: Text.AlignRight
                color: Theme.muted
                font.family: Theme.microFont
                font.pixelSize: 9
                font.letterSpacing: 0.7
            }
        }
    }
}