import QtQuick
import QtQuick.Layouts
import Quickshell
import Quickshell.Io

import "../../config" as Cfg

Rectangle {
    id: root

    property real panelRadius: Cfg.Config.radius / 2
    property int  borderWidth: Cfg.Config.panelBorderWidth
    property int  barHeight:   Cfg.Config.barHeight
    property int  barMargin:   Cfg.Config.margin
    readonly property var t: Cfg.Config.theme

    width:  statsLayout.implicitWidth + 20
    height: Cfg.Config.moduleHeight
    color:  t.statsBg
    radius: panelRadius
    border.color: t.statsBorder
    border.width: borderWidth

    Behavior on width {
        NumberAnimation { duration: 250; easing.type: Easing.OutCubic }
    }

    HoverHandler { cursorShape: Qt.PointingHandCursor }

    property real cpuVal:  0
    property real memVal:  0
    property real diskVal: 0

    Timer {
        interval: 2000
        running: true
        repeat: true
        triggeredOnStart: true
        onTriggered: {
            cpuProc.running  = true
            memProc.running  = true
            diskProc.running = true
        }
    }

    Process {
        id: cpuProc
        command: ["sh", "-c", "top -bn1 | awk '/^%Cpu/ {print 100-$8}'"]
        stdout: SplitParser {
            onRead: data => {
                let val = parseFloat(data.trim())
                root.cpuVal = isNaN(val) ? 0 : val
            }
        }
    }

    Process {
        id: memProc
        command: ["sh", "-c", "free | awk '/Mem:/ {print ($2-$7)/$2 * 100}'"]
        stdout: SplitParser {
            onRead: data => {
                let val = parseFloat(data.trim())
                root.memVal = isNaN(val) ? 0 : val
            }
        }
    }

    Process {
        id: diskProc
        command: ["sh", "-c", "df / --output=pcent | tail -1 | tr -dc '0-9'"]
        stdout: SplitParser {
            onRead: data => {
                let val = parseFloat(data.trim())
                root.diskVal = isNaN(val) ? 0 : val
            }
        }
    }

    component StatRing: Item {
        id: ring

        property real   value:      0.0
        property string label:      ""
        property color  ringColor:  Cfg.Config.theme.accent
        property color  trackColor: Cfg.Config.theme.statsTrackColor
        property color  labelColor: Cfg.Config.theme.textMain

        Behavior on value {
            NumberAnimation {
                duration: 800
                easing.type: Easing.OutCubic
            }
        }

        readonly property real fraction: Math.max(0, Math.min(value, 100)) / 100

        width:  Cfg.Config.statsRingSize
        height: Cfg.Config.statsRingSize

        onFractionChanged:  arc.requestPaint()
        onRingColorChanged: arc.requestPaint()

        Canvas {
            id: arc
            anchors.fill: parent
            antialiasing: true

            onPaint: {
                var ctx = getContext("2d")
                ctx.reset()
                ctx.clearRect(0, 0, width, height)

                var cx = width / 2
                var cy = height / 2
                var lw = 2.8
                var r  = Math.min(cx, cy) - lw / 2 - 0.5

                ctx.beginPath()
                ctx.arc(cx, cy, r, 0, Math.PI * 2)
                ctx.strokeStyle = ring.trackColor
                ctx.lineWidth = lw
                ctx.stroke()

                if (ring.fraction > 0) {
                    var start = -Math.PI / 2
                    var end   = start + (ring.fraction * Math.PI * 2)
                    ctx.beginPath()
                    ctx.arc(cx, cy, r, start, end)
                    ctx.strokeStyle = ring.ringColor
                    ctx.lineWidth = lw
                    ctx.lineCap = "round"
                    ctx.stroke()
                }
            }
        }

        HoverHandler { id: hov }


        property bool showAlt: false
        onShowAltChanged: arc.requestPaint()

        Connections {
            target: hov
            function onHoveredChanged() {
                if (!hov.hovered) ring.showAlt = false
            }
        }

        TapHandler {
            enabled: !Cfg.Config.statsHideTextUntilHover || hov.hovered
            onTapped: ring.showAlt = !ring.showAlt
        }

        Text {
            anchors.centerIn: parent


            text: {
                if (Cfg.Config.statsHideTextUntilHover) {
                    if (!hov.hovered) return ""
                    var showPct = ring.showAlt
                        ? !Cfg.Config.statsShowPercentByDefault
                        :  Cfg.Config.statsShowPercentByDefault
                    return showPct ? Math.round(ring.value) + "%" : ring.label
                } else {
                    var baseShowPct = Cfg.Config.statsShowPercentByDefault
                        ? !hov.hovered   
                        :  hov.hovered  
                    var finalShowPct = ring.showAlt ? !baseShowPct : baseShowPct
                    return finalShowPct ? Math.round(ring.value) + "%" : ring.label
                }
            }

            color: ring.labelColor
            font.pixelSize: Cfg.Config.statsRingFontSize
            font.bold: true
            font.family: "monospace"

            opacity: (Cfg.Config.statsHideTextUntilHover && !hov.hovered) ? 0 : 1
            Behavior on opacity {
                NumberAnimation { duration: 180; easing.type: Easing.OutCubic }
            }
        }
    }

    RowLayout {
        id: statsLayout
        anchors.centerIn: parent
        spacing: 10

        StatRing {
            value:      root.cpuVal
            label:      "cpu"
            ringColor:  root.t.statsCpuColor
            trackColor: root.t.statsTrackColor
            labelColor: root.t.statsText
        }

        StatRing {
            value:      root.memVal
            label:      "ram"
            ringColor:  root.t.statsMemColor
            trackColor: root.t.statsTrackColor
            labelColor: root.t.statsText
        }

        StatRing {
            value:      root.diskVal
            label:      "disk"
            ringColor:  root.t.statsDiskColor
            trackColor: root.t.statsTrackColor
            labelColor: root.t.statsText
        }
    }
}