import QtQuick
import QtQuick.Layouts
import qs.Common
import qs.Services
import qs.Widgets
import qs.Modules.Plugins
import Quickshell.Io
import "./lib.js" as TailscaleLib

PluginComponent {
    id: root

    property bool isConnected: false
    property string tailscaleIP: ""
    property string currentExitNode: ""
    property var peers: []
    property string cachedClipboardTool: ""
    property string _copyText: ""
    property string _copyCurrentTool: ""
    property int _copyAttempted: 0
    property bool _pendingToggle: false  // transient one-shot for post-action verification (to be removed in first-principles refactor)

    layerNamespacePlugin: "tailscalectl"
    popoutWidth: 360
    popoutHeight: 400

    Component.onCompleted: {
        // Initial status fetch on load. Subsequent fetches are on-demand (popout open, explicit refresh, or post-action verification).
        statusCheck.running = true
    }

    Process {
        id: toggleProcess

        stderr: StdioCollector {}

        onExited: (code, status) => {
            if (code !== 0) {
                var action = root.isConnected ? "disconnect" : "connect"
                var detail = toggleProcess.stderr.text.trim().slice(0, 120)
                ToastService.showError("tailscalectl", TailscaleLib.errorMessage(action) + (detail ? " — " + detail : ""))
            }
            statusCheck.running = true
        }
    }

    Process {
        id: copyProcess

        stderr: StdioCollector {}

        onExited: (code, status) => {
            if (code === 0) {
                root.cachedClipboardTool = root._copyCurrentTool
                ToastService.showInfo("Copied " + root._copyText + " to clipboard")
            } else {
                root._copyAttempted += 1
                if (root._copyAttempted < TailscaleLib.allClipboardTools().length) {
                    root._copyCurrentTool = TailscaleLib.nextClipboardTool(root._copyCurrentTool)
                    root._executeCopy()
                } else {
                    var detail = copyProcess.stderr.text.trim().slice(0, 120)
                    ToastService.showError("tailscalectl", "No clipboard tool found" + (detail ? " — " + detail : ""))
                }
            }
        }
    }

    Process {
        id: exitNodeProcess

        stderr: StdioCollector {}

        onExited: (code, status) => {
            if (code !== 0) {
                var detail = exitNodeProcess.stderr.text.trim().slice(0, 120)
                ToastService.showError("tailscalectl", TailscaleLib.errorMessage("set") + (detail ? " — " + detail : ""))
            }
            statusCheck.running = true
        }
    }

    Process {
        id: statusCheck

        command: ["tailscale", "status", "--json"]

        stdout: StdioCollector {}

        onExited: (code, status) => {
            if (code === 0) {
                const state = TailscaleLib.parseStatusResult(statusCheck.stdout.text)
                root.isConnected = state.isConnected
                root.tailscaleIP = state.tailscaleIP
                root.currentExitNode = state.currentExitNode
                root.peers = state.peers
            } else {
                root.isConnected = false
                root.tailscaleIP = ""
                root.currentExitNode = ""
                root.peers = []
                ToastService.showError("tailscalectl", TailscaleLib.errorMessage("status"))
            }

            // Post-action verification: if a toggle was requested, use the fresh state we just received.
            if (root._pendingToggle) {
                root._pendingToggle = false
                toggleProcess.command = TailscaleLib.buildToggleCommand(root.isConnected)
                toggleProcess.running = true
            }
        }
    }

    function toggleTailscale() {
        // Post-action verification: force a fresh status check, then act on the real ground truth.
        root._pendingToggle = true
        statusCheck.running = true
    }

    function setExitNode(hostname) {
        exitNodeProcess.command = TailscaleLib.makeExitNodeCommand(hostname)
        exitNodeProcess.running = true
    }

    function copyToClipboard(text) {
        root._copyText = text
        root._copyAttempted = 0
        if (root.cachedClipboardTool) {
            root._copyCurrentTool = root.cachedClipboardTool
        } else {
            root._copyCurrentTool = TailscaleLib.allClipboardTools()[0]
        }
        root._executeCopy()
    }

    function _executeCopy() {
        var cmd = TailscaleLib.buildCopyCommand(root._copyText, root._copyCurrentTool)
        if (!cmd) {
            ToastService.showError("tailscalectl", "Invalid clipboard command")
            return
        }
        copyProcess.command = cmd
        copyProcess.running = true
    }

    popoutContent: Component {
        PopoutComponent {
            headerText: "Tailscale"
            detailsText: root.isConnected ? "Connected" : "Disconnected"
            showCloseButton: true

            Item {
                id: contentItem
                width: parent.width
                height: Theme.spacingM + statusRow.implicitHeight + Theme.spacingM + peerList.height + Theme.spacingM

                Row {
                    id: statusRow
                    y: Theme.spacingM
                    width: parent.width
                    spacing: Theme.spacingS
                    anchors.left: parent.left
                    anchors.leftMargin: Theme.spacingM
                    anchors.right: parent.right
                    anchors.rightMargin: Theme.spacingM

                    MouseArea {
                        cursorShape: Qt.PointingHandCursor
                        hoverEnabled: true
                        anchors.verticalCenter: parent.verticalCenter
                        width: toggleIcon.implicitWidth
                        height: toggleIcon.implicitHeight
                        onClicked: {
                            root.toggleTailscale()
                        }

                        DankIcon {
                            id: toggleIcon
                            name: root.isConnected ? "power" : "power_off"
                            size: Theme.iconSize
                            color: Theme.primary
                            anchors.centerIn: parent
                        }
                    }

                    StyledText {
                        text: root.tailscaleIP || "—"
                        font.pixelSize: Theme.fontSizeSmall
                        color: Theme.primary
                        anchors.verticalCenter: parent.verticalCenter
                    }

                    Item { width: 1; height: 1; Layout.fillWidth: true }

                    StyledText {
                        text: "Exit node: " + (root.currentExitNode || "None")
                        font.pixelSize: Theme.fontSizeSmall
                        color: Theme.surfaceVariantText
                        anchors.verticalCenter: parent.verticalCenter
                    }

                    MouseArea {
                        visible: TailscaleLib.shouldShowClearExitNode(root.currentExitNode)
                        cursorShape: Qt.PointingHandCursor
                        hoverEnabled: true
                        anchors.verticalCenter: parent.verticalCenter
                        width: clearExitNodeText.implicitWidth
                        height: clearExitNodeText.implicitHeight
                        onClicked: {
                            root.setExitNode("")
                        }

                        StyledText {
                            id: clearExitNodeText
                            text: "×"
                            font.pixelSize: Theme.fontSizeSmall
                            color: Theme.surfaceVariantText
                        }
                    }
                }

                ListView {
                    id: peerList
                    y: Theme.spacingM + statusRow.implicitHeight + Theme.spacingM
                    width: parent.width - Theme.spacingM * 2
                    height: Math.min(root.peers.length * (Theme.fontSizeSmall + Theme.spacingXS), 200)
                    anchors.left: parent.left
                    anchors.leftMargin: Theme.spacingM
                    model: root.peers
                    interactive: true
                    boundsBehavior: Flickable.DragAndOvershootBounds

                    delegate: Item {
                        width: peerList.width
                        height: Theme.fontSizeSmall + Theme.spacingXS

                        Row {
                            anchors.fill: parent
                            spacing: Theme.spacingS
                            anchors.verticalCenter: parent.verticalCenter

                            MouseArea {
                                cursorShape: Qt.PointingHandCursor
                                hoverEnabled: true
                                anchors.verticalCenter: parent.verticalCenter
                                width: peerHostnameText.implicitWidth
                                height: peerHostnameText.implicitHeight
                                onClicked: {
                                    root.copyToClipboard(modelData.hostname)
                                }

                                StyledText {
                                    id: peerHostnameText
                                    text: modelData.hostname
                                    font.pixelSize: Theme.fontSizeSmall
                                    color: modelData.online ? Theme.primary : Theme.surfaceVariantText
                                }
                            }

                            MouseArea {
                                cursorShape: Qt.PointingHandCursor
                                hoverEnabled: true
                                anchors.verticalCenter: parent.verticalCenter
                                width: peerIpText.implicitWidth
                                height: peerIpText.implicitHeight
                                onClicked: {
                                    root.copyToClipboard(modelData.ip)
                                }

                                StyledText {
                                    id: peerIpText
                                    text: modelData.ip
                                    font.pixelSize: Theme.fontSizeSmall
                                    color: Theme.surfaceVariantText
                                }
                            }

                            MouseArea {
                                visible: modelData.exitNode
                                cursorShape: Qt.PointingHandCursor
                                hoverEnabled: true
                                anchors.verticalCenter: parent.verticalCenter
                                width: exitNodeButton.implicitWidth
                                height: exitNodeButton.implicitHeight
                                onClicked: {
                                    root.setExitNode(modelData.hostname)
                                }

                                StyledText {
                                    id: exitNodeButton
                                    text: "↗"
                                    font.pixelSize: Theme.fontSizeSmall
                                    color: TailscaleLib.isActiveExitNode(root.currentExitNode, modelData.hostname) ? Theme.primary : Theme.surfaceVariantText
                                }
                            }
                        }
                    }
                }
            }
        }
    }

    MouseArea {
        anchors.fill: parent
        acceptedButtons: Qt.RightButton
        onClicked: {
            root.toggleTailscale()
        }
    }

    horizontalBarPill: Component {
        Row {
            spacing: Theme.spacingS

            DankIcon {
                name: root.isConnected ? "vpn_key" : "vpn_key_off"
                size: Theme.iconSize
                color: root.isConnected ? Theme.primary : Theme.surfaceText
            }
        }
    }

    verticalBarPill: Component {
        Column {
            spacing: Theme.spacingXS

            DankIcon {
                name: root.isConnected ? "vpn_key" : "vpn_key_off"
                size: Theme.iconSize
                color: root.isConnected ? Theme.primary : Theme.surfaceText
            }
        }
    }
}