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

PluginComponent {
    id: root

    property bool isConnected: false
    property string tailscaleIP: ""
    property string currentExitNode: ""
    property var peers: []
    property string _copyText: ""
    property int _copyIndex: 0

    layerNamespacePlugin: "tailscalectl"
    popoutWidth: 360
    popoutHeight: 400

    // Transient coordination for the defensive poll-act-poll toggle (exact behavior preserved).
    // We poll for on-the-ground truth (so we choose the correct "up"/"down" and don't lie to the user),
    // act, then poll again for verification. This is *not* long-term cached state.
    // The _pendingAction is short-lived per user action only.
    property string _pendingAction: ""

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

    function _runStatusCheck() {
        Proc.runCommand("tailscale-status", TailscaleLib.getStatusCommand(), (stdout, code) => {
            if (code === 0) {
                const state = TailscaleLib.parseStatusResult(stdout);
                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", I18n.tr(TailscaleLib.formatError("status")));
            }

            const cmd = TailscaleLib.commandForPendingAction(root._pendingAction, root.isConnected);
            if (cmd) {
                // Exact same decision point as before: act based on fresh poll truth, then verify.
                Proc.runCommand("tailscale-toggle", cmd, (out, c) => {
                    if (c !== 0) {
                        const action = root.isConnected ? "disconnect" : "connect";
                        ToastService.showError("tailscalectl", I18n.tr(TailscaleLib.formatError(action)));
                    }
                    root._pendingAction = "";
                    root._runStatusCheck();  // post-action verification poll (exact behavior)
                });
            } else {
                root._pendingAction = "";
            }
        });
    }

    function toggleTailscale() {
        root._pendingAction = "toggle";
        root._runStatusCheck();
    }

    function refreshStatus() {
        root._runStatusCheck();
    }

    function setExitNode(hostname) {
        const cmd = TailscaleLib.makeExitNodeCommand(hostname);
        if (!cmd) {
            ToastService.showError("tailscalectl", I18n.tr(TailscaleLib.getStrings().invalidExitNodeHostname));
            return;
        }
        Proc.runCommand("tailscale-exit", cmd, (stdout, code) => {
            if (code !== 0) {
                // Note: no stderr detail available from Proc (accepted per plan).
                ToastService.showError("tailscalectl", I18n.tr(TailscaleLib.formatError("set")));
            }
            root._runStatusCheck();
        });
    }

    function copyToClipboard(text) {
        root._copyText = text;
        root._copyIndex = 0;
        root._runNextCopy();
    }

    function _runNextCopy() {
        const cmds = TailscaleLib.getClipboardCommands(root._copyText);
        if (root._copyIndex >= cmds.length) {
            ToastService.showError("tailscalectl", I18n.tr(TailscaleLib.formatError("clipboard")));
            return;
        }
        Proc.runCommand("tailscale-copy-" + root._copyIndex, cmds[root._copyIndex], (stdout, code) => {
            if (code === 0) {
                ToastService.showInfo(I18n.tr(TailscaleLib.getStrings().copied).arg(root._copyText));
            } else {
                root._copyIndex += 1;
                root._runNextCopy();
            }
        });
    }

    popoutContent: Component {
        PopoutComponent {
            headerText: I18n.tr(TailscaleLib.getStrings().header)
            detailsText: root.isConnected ? I18n.tr(TailscaleLib.getStrings().connected) : I18n.tr(TailscaleLib.getStrings().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: I18n.tr(TailscaleLib.getStrings().exitNodePrefix) + (root.currentExitNode || I18n.tr(TailscaleLib.getStrings().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
            }
        }
    }
}