import QtQuick 2.9
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.14
import QtGraphicalEffects 1.0

import "../themes/themes.js" as Theme

/* TODO
 [ ] build a better gateway object list (location, user-friendly, country, bridge, etc)
 [ ] ui: mark manual override icon somehow?
 [ ] ui: auto radiobutton should use also the bridge icon
 [ ] corner case: manual override, not full list yet
     [ ] persist bridges
     [ ] persist manual selection
     [ ] display the location we know
 [ ] corner case: user selects bridges with manual selection
     (I think the backend should discard any manual selection when selecting bridges...
      unless the current selection provides the bridge, in which case we can maintain it)
 */

ThemedPage {

    id: locationPage
    title: qsTr("Select Location")

    // TODO add ScrollIndicator 
    // https://doc.qt.io/qt-5.12//qml-qtquick-controls2-scrollindicator.html

    //: this is in the radio button for the auto selection
    property var autoSelectionLabel: qsTr("Automatically use best connection")
    //: Location Selection: label for radio buttons that selects manually
    property var manualSelectionLabel: qsTr("Manually select")
    //: A little display to signal that the clicked gateway is being switched to
    property var switchingLocationLabel: qsTr("Switching gateways...")
    //: Subtitle to explain that only bridge locations are shown in the selector
    property var onlyBridgesWarning: qsTr("Only locations with bridges")

    property bool switching: false

    ButtonGroup {
        id: locsel
    }

    Rectangle {
        id: autoBox
        width: root.width * 0.90
        height: 100
        radius: 10
        color: "white"

        anchors {
            horizontalCenter: parent.horizontalCenter
            top: parent.top
            margins: 10
        }

        Rectangle {
            anchors {
                fill: parent
                margins: 10
            }
            Label {
                id: recommendedLabel
                //: Location Selection: label for radio button that selects automatically
                text: qsTr("Recommended")
                font.bold: true
            }
            WrappedRadioButton {
                id: autoRadioButton
                anchors.top: recommendedLabel.bottom
                text: getAutoLabel() 
                ButtonGroup.group: locsel
                checked: false
                onClicked: {
                    root.selectedGateway = "auto"
                    console.debug("Selected gateway: auto")
                    backend.useAutomaticGateway()
                }
            }
        }
    }

    Rectangle {
        id: manualBox
        visible: root.locationsModel.length > 0
        width: root.width * 0.90
        height: getManualBoxHeight()
        radius: 10
        color: Theme.fgColor
        anchors {
            horizontalCenter: parent.horizontalCenter
            top: autoBox.bottom
            margins: 10
        }
        Rectangle {
            anchors {
                fill: parent
                margins: 10
            }
            Label {
                id: manualLabel
                text: manualSelectionLabel
                font.bold: true
            }
            Label {
                id: bridgeWarning
                text: onlyBridgesWarning
                color: "gray"
                visible: isBridgeSelected()
                wrapMode: Text.Wrap
                anchors {
                    topMargin: 5
                    top: manualLabel.bottom
                }
                font.pixelSize: Theme.fontSize - 3
            }
            ColumnLayout {
                id: gatewayListColumn
                width: parent.width
                spacing: 1
                anchors.top: getManualAnchor()

                Repeater {
                    id: gwManualSelectorList
                    width: parent.width
                    model: root.locationsModel

                    RowLayout {
                        width: parent.width
                        WrappedRadioButton {
                            text: getLocationLabel(modelData)
                            location: modelData
                            ButtonGroup.group: locsel
                            checked: false
                            enabled: locationPage.switching ? false : true
                            onClicked: {
                                if (ctx.status == "on") {
                                    locationPage.switching = true
                                }
                                root.selectedGateway = location
                                backend.useLocation(location)
                            }
                        }
                        Item {
                            Layout.fillWidth: true
                        }
                        Image {
                            height: 16
                            width: 16
                            visible: isBridgeSelected()
                            source: "../resources/bridge.png"
                            Layout.alignment: Qt.AlignRight
                            Layout.rightMargin: 10
                        }
			SignalIcon {
                            // TODO mocked!
			    quality: getSignalFor(modelData)
			    Layout.alignment: Qt.AlignRight
			    Layout.rightMargin: 20
			}
                    }
                }
            }
        }
    }

    StateGroup {
        states: [
            State {
                when: locationPage.switching && ctx.status != "on"
                PropertyChanges {
                    target: manualLabel
                    text: switchingLocationLabel
                }
            },
            State {
                when: ctx && ctx.status == "on"
                PropertyChanges {
                    target: manualLabel
                    text: manualSelectionLabel
                }
                StateChangeScript {
                    script: {
                        locationPage.switching = false
                    }
                }
            }
        ]
    }

    function getAutoLabel() {
        let l = autoSelectionLabel
        if (ctx && ctx.locations && ctx.bestLocation) {
            let best = ctx.locationLabels[ctx.bestLocation]
            let label = best[0] + ", " + best[1]
            l += " (" + label + ")"
        }
        return l
    }

    function getLocationLabel(location) {
        if (!ctx) { return ""}
        let l = ctx.locationLabels[location]
        return l[0] + ", " + l[1]
    }

    function getManualBoxHeight() {
        let h = gatewayListColumn.height + manualLabel.height
        if (bridgeWarning.visible) {
            h += bridgeWarning.height
        }
        return h + 15
    }

    function getSignalFor(location) {
        switch(location) {
        case "amsterdam":
        case "paris":
            return "good"
        case "newyork":
            return "medium"
        case "montreal":
            return "medium"
        default:
            return "low"
        }
    }

    function isBridgeSelected() {
        if (ctx && ctx.transport == "obfs4") {
            return true
        } else {
            return false
        }
    }

    function getManualAnchor() {
        if (isBridgeSelected()) {
            return bridgeWarning.bottom
        } else {
            return manualLabel.bottom
        }
    }

    Component.onCompleted: {
        if (root.selectedGateway == "auto") {
            autoRadioButton.checked = true;
        } else {
            let match = false
            for (var i=1; i<locsel.buttons.length; i++) {
                let b = locsel.buttons[i]
                if (b.location == root.selectedGateway) {
                    match = true;
                    b.checked = true;
                }
            }
        }
    }
}