import QtQuick 2.9
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3

import ComputerModel 1.0

import ComputerManager 1.0
import StreamingPreferences 1.0
import SdlGamepadKeyNavigation 1.0

CenteredGridView {
    property ComputerModel computerModel : createModel()

    id: pcGrid
    focus: true
    activeFocusOnTab: true
    topMargin: 20
    bottomMargin: 5
    cellWidth: 310; cellHeight: 330;
    objectName: qsTr("Computers")

    Component.onCompleted: {
        // Don't show any highlighted item until interacting with them.
        // We do this here instead of onActivated to avoid losing the user's
        // selection when backing out of a different page of the app.
        currentIndex = -1
    }

    // Note: Any initialization done here that is critical for streaming must
    // also be done in CliStartStreamSegue.qml, since this code does not run
    // for command-line initiated streams.
    StackView.onActivated: {
        // Setup signals on CM
        ComputerManager.computerAddCompleted.connect(addComplete)

        // This is a bit of a hack to do this here as opposed to main.qml, but
        // we need it enabled before calling getConnectedGamepads() and PcView
        // is never destroyed, so it should be okay.
        SdlGamepadKeyNavigation.enable()

        // Highlight the first item if a gamepad is connected
        if (currentIndex == -1 && SdlGamepadKeyNavigation.getConnectedGamepads() > 0) {
            currentIndex = 0
        }
    }

    StackView.onDeactivating: {
        ComputerManager.computerAddCompleted.disconnect(addComplete)
    }

    function pairingComplete(error)
    {
        // Close the PIN dialog
        pairDialog.close()

        // Display a failed dialog if we got an error
        if (error !== undefined) {
            errorDialog.text = error
            errorDialog.helpText = ""
            errorDialog.open()
        }
    }

    function addComplete(success, detectedPortBlocking)
    {
        if (!success) {
            errorDialog.text = qsTr("Unable to connect to the specified PC.")

            if (detectedPortBlocking) {
                errorDialog.text += "\n\n" + qsTr("This PC's Internet connection is blocking Moonlight. Streaming over the Internet may not work while connected to this network.")
            }
            else {
                errorDialog.helpText = qsTr("Click the Help button for possible solutions.")
            }

            errorDialog.open()
        }
    }

    function createModel()
    {
        var model = Qt.createQmlObject('import ComputerModel 1.0; ComputerModel {}', parent, '')
        model.initialize(ComputerManager)
        model.pairingCompleted.connect(pairingComplete)
        model.connectionTestCompleted.connect(testConnectionDialog.connectionTestComplete)
        return model
    }

    Row {
        anchors.centerIn: parent
        spacing: 5
        visible: pcGrid.count === 0

        BusyIndicator {
            id: searchSpinner
            visible: StreamingPreferences.enableMdns
        }

        Label {
            height: searchSpinner.height
            elide: Label.ElideRight
            text: StreamingPreferences.enableMdns ? qsTr("Searching for PCs on your local network with NVIDIA GameStream enabled...")
                                                  : qsTr("Automatic PC discovery is disabled. Add your PC manually.")
            font.pointSize: 20
            verticalAlignment: Text.AlignVCenter
            wrapMode: Text.Wrap
        }
    }

    model: computerModel

    delegate: NavigableItemDelegate {
        width: 300; height: 320;
        grid: pcGrid

        Image {
            id: pcIcon
            anchors.horizontalCenter: parent.horizontalCenter
            source: "qrc:/res/desktop_windows-48px.svg"
            sourceSize {
                width: 200
                height: 200
            }
        }

        Image {
            // TODO: Tooltip
            id: stateIcon
            anchors.horizontalCenter: pcIcon.horizontalCenter
            anchors.verticalCenter: pcIcon.verticalCenter
            anchors.verticalCenterOffset: -15
            visible: !model.statusUnknown && (!model.online || !model.paired)
            source: !model.online ? "qrc:/res/baseline-warning-24px.svg" : "qrc:/res/baseline-lock-24px.svg"
            sourceSize {
                width: 75
                height: 75
            }
        }

        BusyIndicator {
            id: statusUnknownSpinner
            anchors.horizontalCenter: pcIcon.horizontalCenter
            anchors.verticalCenter: pcIcon.verticalCenter
            anchors.verticalCenterOffset: -15
            width: 75
            height: 75
            visible: model.statusUnknown
        }

        Label {
            id: pcNameText
            text: model.name

            width: parent.width
            anchors.top: pcIcon.bottom
            anchors.bottom: parent.bottom
            font.pointSize: 36
            horizontalAlignment: Text.AlignHCenter
            wrapMode: Text.Wrap
            elide: Text.ElideRight
        }

        NavigableMenu {
            id: pcContextMenu
            MenuItem {
                text: qsTr("PC Status: %1").arg(model.online ? qsTr("Online") : qsTr("Offline"))
                font.bold: true
                enabled: false
            }
            NavigableMenuItem {
                parentMenu: pcContextMenu
                text: qsTr("View All Apps")
                onTriggered: {
                    var component = Qt.createComponent("AppView.qml")
                    var appView = component.createObject(stackView, {"computerIndex": index, "objectName": model.name, "showHiddenGames": true})
                    stackView.push(appView)
                }
                visible: model.online && model.paired
            }
            NavigableMenuItem {
                parentMenu: pcContextMenu
                text: qsTr("Wake PC")
                onTriggered: computerModel.wakeComputer(index)
                visible: !model.online && model.wakeable
            }
            NavigableMenuItem {
                parentMenu: pcContextMenu
                text: qsTr("Test Network")
                onTriggered: {
                    computerModel.testConnectionForComputer(index)
                    testConnectionDialog.open()
                }
            }

            NavigableMenuItem {
                parentMenu: pcContextMenu
                text: qsTr("Rename PC")
                onTriggered: {
                    renamePcDialog.pcIndex = index
                    renamePcDialog.originalName = model.name
                    renamePcDialog.open()
                }
            }
            NavigableMenuItem {
                parentMenu: pcContextMenu
                text: qsTr("Delete PC")
                onTriggered: {
                    deletePcDialog.pcIndex = index
                    // get confirmation first, actual closing is called from the dialog
                    deletePcDialog.open()
                }
            }
        }

        onClicked: {
            if (model.online) {
                if (model.paired) {
                    // go to game view
                    var component = Qt.createComponent("AppView.qml")
                    var appView = component.createObject(stackView, {"computerIndex": index, "objectName": model.name})
                    stackView.push(appView)
                }
                else {
                    if (!model.busy) {
                        var pin = computerModel.generatePinString()

                        // Kick off pairing in the background
                        computerModel.pairComputer(index, pin)

                        // Display the pairing dialog
                        pairDialog.pin = pin
                        pairDialog.open()
                    }
                    else {
                        // cannot pair while something is streaming or attempting to pair
                        errorDialog.text = qsTr("You cannot pair while a previous session is still running on the host PC. Quit any running games or reboot the host PC, then try pairing again.")
                        errorDialog.helpText = ""
                        errorDialog.open()
                    }
                }
            } else if (!model.online) {
                // Using open() here because it may be activated by keyboard
                pcContextMenu.open()
            }
        }

        onPressAndHold: {
            // popup() ensures the menu appears under the mouse cursor
            if (pcContextMenu.popup) {
                pcContextMenu.popup()
            }
            else {
                // Qt 5.9 doesn't have popup()
                pcContextMenu.open()
            }
        }

        MouseArea {
            anchors.fill: parent
            acceptedButtons: Qt.RightButton;
            onClicked: {
                parent.onPressAndHold()
            }
        }

        Keys.onMenuPressed: {
            // We must use open() here so the menu is positioned on
            // the ItemDelegate and not where the mouse cursor is
            pcContextMenu.open()
        }
    }

    ErrorMessageDialog {
        id: errorDialog

        // Using Setup-Guide here instead of Troubleshooting because it's likely that users
        // will arrive here by forgetting to enable GameStream or not forwarding ports.
        helpUrl: "https://github.com/moonlight-stream/moonlight-docs/wiki/Setup-Guide"
    }

    NavigableMessageDialog {
        id: pairDialog

        // Pairing dialog must be modal to prevent double-clicks from triggering
        // pairing twice
        modal: true
        closePolicy: Popup.CloseOnEscape

        // don't allow edits to the rest of the window while open
        property string pin : "0000"
        text:qsTr("Please enter %1 on your GameStream PC. This dialog will close when pairing is completed.").arg(pin)
        standardButtons: Dialog.Cancel
        onRejected: {
            // FIXME: We should interrupt pairing here
        }
    }

    NavigableMessageDialog {
        id: deletePcDialog
        // don't allow edits to the rest of the window while open
        property int pcIndex : -1;
        text:qsTr("Are you sure you want to remove this PC?")
        standardButtons: Dialog.Yes | Dialog.No

        function deletePc() {
            console.log("deleting PC pairing for PC at index: " + pcIndex)
            computerModel.deleteComputer(pcIndex);
        }

        onAccepted: deletePc()
    }

    NavigableMessageDialog {
        id: testConnectionDialog
        closePolicy: Popup.CloseOnEscape
        standardButtons: Dialog.Ok

        onAboutToShow: {
            testConnectionDialog.text = qsTr("Moonlight is testing your network connection to determine if NVIDIA GameStream is blocked.") + "\n\n" + qsTr("This may take a few seconds…")
            showSpinner = true
        }

        function connectionTestComplete(result, blockedPorts)
        {
            if (result === -1) {
                text = qsTr("The network test could not be performed because none of Moonlight's connection testing servers were reachable from this PC. Check your Internet connection or try again later.")
                imageSrc = "qrc:/res/baseline-warning-24px.svg"
            }
            else if (result === 0) {
                text = qsTr("This network does not appear to be blocking Moonlight. If you still have trouble connecting, check your PC's firewall settings.") + "\n\n" + qsTr("If you are trying to stream over the Internet, install the Moonlight Internet Hosting Tool on your gaming PC and run the included Internet Streaming Tester to check your gaming PC's Internet connection.")
                imageSrc = "qrc:/res/baseline-check_circle_outline-24px.svg"
            }
            else {
                text = qsTr("Your PC's current network connection seems to be blocking Moonlight. Streaming over the Internet may not work while connected to this network.") + "\n\n" + qsTr("The following network ports were blocked:") + "\n"
                text += blockedPorts
                imageSrc = "qrc:/res/baseline-error_outline-24px.svg"
            }

            // Stop showing the spinner and show the image instead
            showSpinner = false
        }
    }

    NavigableDialog {
        id: renamePcDialog
        property string label: qsTr("Enter the new name for this PC:")
        property string originalName
        property int pcIndex : -1;

        standardButtons: Dialog.Ok | Dialog.Cancel

        onOpened: {
            // Force keyboard focus on the textbox so keyboard navigation works
            editText.forceActiveFocus()
        }

        onClosed: {
            editText.clear()
        }

        onAccepted: {
            if (editText.text) {
                computerModel.renameComputer(pcIndex, editText.text)
            }
        }

        ColumnLayout {
            Label {
                text: renamePcDialog.label
                font.bold: true
            }

            TextField {
                id: editText
                placeholderText: renamePcDialog.originalName
                Layout.fillWidth: true
                focus: true

                Keys.onReturnPressed: {
                    renamePcDialog.accept()
                }
            }
        }
    }

    ScrollBar.vertical: ScrollBar {}
}