// DragonRelayView.qml
//
// Add a DragonRelay server and connect to its VPN.
// Wire this view up to a DragonRelayBackend C++ object exposed to QML via
// qmlRegisterType or setContextProperty:
//
//   // main.cpp
//   engine.rootContext()->setContextProperty("dragonRelay", &g_relayBackend);
//
// DragonRelayBackend (to be written as a thin QObject wrapper around
// RelayClient + TunnelManager) should expose:
//   Q_PROPERTY(int  status  ...)      // 0=Idle, 1=Connecting, 2=Connected, 3=Error
//   Q_PROPERTY(QString statusText ...) // human-readable status
//   Q_PROPERTY(var  hosts ...)        // list model of {name, ip, port}
//   Q_INVOKABLE void connectRelay(url, username, password)
//   Q_INVOKABLE void disconnectRelay()
//   Q_INVOKABLE void streamHost(ip, app)
//   signal: hostsChanged()
//   signal: errorOccurred(message)

import QtQuick 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15

Page {
    id: root
    title: qsTr("DragonRelay")

    // ── State ──────────────────────────────────────────────────────────────

    readonly property int stateIdle:       0
    readonly property int stateConnecting: 1
    readonly property int stateConnected:  2
    readonly property int stateError:      3

    // Bound to dragonRelay.status in real integration
    property int  currentState: stateIdle
    property string statusText:  qsTr("Not connected")

    // Display picker state
    property bool showDisplayPicker: false
    property var pickerDisplays: []
    property string pickerHostIP: ""
    property string pickerHostName: ""

    // ── Header bar ─────────────────────────────────────────────────────────

    header: ToolBar {
        RowLayout {
            anchors.fill: parent
            anchors.leftMargin:  12
            anchors.rightMargin: 12

            Image {
                source: "qrc:/app/assets/wilddragon-icon.jpg"
                width:  24
                height: 24
                fillMode: Image.PreserveAspectFit
                smooth: true
            }

            Label {
                text: qsTr("DragonRelay")
                font.pixelSize: 16
                font.bold: true
            }

            Item { Layout.fillWidth: true }

            // Connection status pill
            Rectangle {
                width:  statusLabel.implicitWidth + 20
                height: 24
                radius: 12
                color: {
                    switch (root.currentState) {
                        case root.stateConnecting: return "#f59e0b"  // amber
                        case root.stateConnected:  return "#10b981"  // green
                        case root.stateError:      return "#ef4444"  // red
                        default:                   return "#6b7280"  // grey
                    }
                }

                Label {
                    id: statusLabel
                    anchors.centerIn: parent
                    text: root.statusText
                    color: "white"
                    font.pixelSize: 12
                }
            }
        }
    }

    // ── Body ───────────────────────────────────────────────────────────────

    ColumnLayout {
        anchors.fill: parent
        anchors.margins: 24
        spacing: 20

        // ── Login form (shown when idle or errored) ────────────────────────

        GroupBox {
            id: loginBox
            title: qsTr("Connect to a DragonRelay server")
            Layout.fillWidth: true
            visible: root.currentState === root.stateIdle
                  || root.currentState === root.stateError

            ColumnLayout {
                anchors.fill: parent
                spacing: 12

                // Logo
                Image {
                    Layout.alignment: Qt.AlignHCenter
                    source: "qrc:/app/assets/wilddragon-logo.jpg"
                    width:  80
                    height: 80
                    fillMode: Image.PreserveAspectFit
                    smooth: true
                }

                TextField {
                    id: urlField
                    Layout.fillWidth: true
                    placeholderText: qsTr("Relay URL  e.g. https://relay.wilddragon.net")
                    text: "https://"
                    inputMethodHints: Qt.ImhUrlCharactersOnly
                }

                TextField {
                    id: userField
                    Layout.fillWidth: true
                    placeholderText: qsTr("Username")
                }

                TextField {
                    id: passField
                    Layout.fillWidth: true
                    placeholderText: qsTr("Password")
                    echoMode: TextInput.Password
                }

                CheckBox {
                    id: saveCheck
                    text: qsTr("Remember this server")
                    checked: true
                }

                Button {
                    id: connectBtn
                    Layout.fillWidth: true
                    text: root.currentState === root.stateConnecting
                          ? qsTr("Connecting…")
                          : qsTr("Connect")
                    enabled: urlField.text.length > 7
                          && userField.text.length > 0
                          && passField.text.length > 0
                          && root.currentState !== root.stateConnecting

                    onClicked: {
                        root.currentState = root.stateConnecting
                        root.statusText   = qsTr("Connecting…")
                        // Real call: dragonRelay.connectRelay(urlField.text, userField.text, passField.text)
                    }
                }

                // Error message
                Label {
                    id: errorLabel
                    Layout.fillWidth: true
                    visible: root.currentState === root.stateError
                    color: "#ef4444"
                    wrapMode: Text.WordWrap
                    text: root.statusText
                }
            }
        }

        // ── Host list (shown when connected) ──────────────────────────────

        GroupBox {
            title: qsTr("Streaming hosts")
            Layout.fillWidth: true
            Layout.fillHeight: true
            visible: root.currentState === root.stateConnected

            ColumnLayout {
                anchors.fill: parent
                spacing: 8

                ListView {
                    id: hostList
                    Layout.fillWidth: true
                    Layout.fillHeight: true
                    clip: true
                    spacing: 8

                    // In real integration: model: dragonRelay.hosts
                    model: ListModel {
                        // Placeholder for design-time preview
                        ListElement { hostName: "Gaming PC";    hostIp: "10.99.0.10" }
                        ListElement { hostName: "Living Room";  hostIp: "10.99.0.11" }
                    }

                    delegate: Rectangle {
                        width:  hostList.width
                        height: 56
                        radius: 8
                        color:  hostMouse.containsMouse ? "#374151" : "#1f2937"

                        RowLayout {
                            anchors.fill:        parent
                            anchors.leftMargin:  16
                            anchors.rightMargin: 16

                            Column {
                                Label {
                                    text:  model.hostName
                                    font.pixelSize: 14
                                    font.bold: true
                                    color: "white"
                                }
                                Label {
                                    text:  model.hostIp
                                    font.pixelSize: 11
                                    color: "#9ca3af"
                                }
                            }

                            Item { Layout.fillWidth: true }

                            Button {
                                text: qsTr("Stream")
                                onClicked: {
                                    var displays = dragonRelay.displaysForHost(model.hostIp)
                                    if (displays && displays.length > 1) {
                                        root.pickerHostIP = model.hostIp
                                        root.pickerHostName = model.hostName
                                        root.pickerDisplays = displays
                                        root.showDisplayPicker = true
                                    } else {
                                        dragonRelay.streamHost(model.hostIp, "Desktop")
                                    }
                                }
                            }
                        }

                        MouseArea {
                            id: hostMouse
                            anchors.fill: parent
                            hoverEnabled: true
                            onDoubleClicked: {
                                // Real call: dragonRelay.streamHost(model.hostIp, "Desktop")
                            }
                        }
                    }
                }

                Button {
                    Layout.alignment: Qt.AlignRight
                    text: qsTr("Disconnect")
                    flat: true
                    onClicked: {
                        root.currentState = root.stateIdle
                        root.statusText   = qsTr("Not connected")
                        // Real call: dragonRelay.disconnectRelay()
                    }
                }
            }
        }

        Item { Layout.fillHeight: true; visible: root.currentState !== root.stateConnected }
    }

    // ── Display Picker Modal ───────────────────────────────────────────────

    DragonDisplayPicker {
        visible: root.showDisplayPicker
        anchors.fill: parent
        hostIP: root.pickerHostIP
        hostName: root.pickerHostName
        displays: root.pickerDisplays
        onDisplaySelected: function(idx) {
            root.showDisplayPicker = false
            dragonRelay.streamHostDisplay(root.pickerHostIP, idx)
        }
        onCancelled: { root.showDisplayPicker = false }
    }
}