import QtQuick 2.0
import QtQuick.Controls 2.9
import QtQuick.Layouts 1.0
import de.itsblue.omobidisplayapp 1.0
import de.itsblue.bluetoothleuart 1.0
import QtQuick.Controls.Material 2.0
import QtGraphicalEffects 1.0

Page {
    id: root

    property bool actionButtonVisible: false
    property bool backButtonVisible: false
    property string statusText
    property bool working

    title: qsTr("Available displays")

    ColumnLayout {
        id: mainLayout
        anchors {
            fill: parent
            margins: Math.min(parent.height, parent.width) * 0.05
        }

        Chip {
            Layout.fillWidth: true
            Layout.preferredHeight: mainLayout.height * 0.05
            Layout.alignment: Layout.Center

            color: "white"

            onClicked: {
                backend.bleClient.startScanningForDevices()
            }

            RowLayout {
                spacing: mainLayout.anchors.margins

                anchors.fill: parent
                anchors.leftMargin: width * 0.05
                anchors.rightMargin: 0

                Text {
                    Layout.fillHeight: true
                    Layout.fillWidth: true
                    verticalAlignment: Text.AlignVCenter
                    font.pixelSize: parent.height * 0.4
                    text: root.statusText
                }

                BusyIndicator {
                    Layout.fillHeight: true
                    Layout.preferredWidth: height

                        id: busyIndicator

                        scale: 0.8

                        opacity: root.working ? 1:0
                    }

            }
        }

        Item {
            Layout.fillWidth: true
            Layout.preferredHeight: mainLayout.height * 0.025
        }

        ListView {
            id: availableDisplaysListView

            Layout.preferredWidth: parent.width
            Layout.fillHeight: true
            Layout.alignment: Layout.Center

            clip: true
            boundsBehavior: Flickable.OvershootBounds

            model: backend.bleClient.availableDevicesModel

            add: Transition {
                NumberAnimation { property: "opacity"; from: 0; to: 1; duration: 200 }
                NumberAnimation { property: "scale"; from: 0.9; to: 1; duration: 200 }
            }

            remove: Transition {
                NumberAnimation { property: "opacity"; from: 1; to: 0; duration: 200 }
                NumberAnimation { property: "scale"; from: 1; to: 0.9; duration: 200 }
            }

            spacing: 5

            delegate: ItemDelegate {
                width: parent.width

                text: name

                onClicked: backend.bleClient.connectToDevice(device)

                Rectangle {
                    anchors {
                        top: parent.top
                        left: parent.left
                        right: parent.right
                        topMargin: - availableDisplaysListView.spacing * 0.5
                    }

                    color: "lightgrey"
                    height: 1
                    visible: index !== 0
                }
            }

            Item {
                anchors.centerIn: parent

                width: Math.min(parent.height, parent.width)
                height: Math.min(parent.height, parent.width)

                opacity: availableDisplaysListView.model.rowCount === 0 ? 1:0

                Behavior on opacity {
                    NumberAnimation {}
                }

                Rectangle {
                    id: noDisplaysRect

                    anchors {
                        top: parent.top
                        topMargin: parent.height * 0.2
                        horizontalCenter: parent.horizontalCenter
                    }

                    width: parent.width * 0.7
                    height: width * 0.3

                    color: "transparent"

                    border.width: height * 0.15
                    border.color: "lightgrey"

                    Text {
                        anchors.centerIn: parent
                        anchors.verticalCenterOffset: text === "..." ? -height * 0.25:0
                        color: "lightgrey"
                        font.pixelSize: parent.height * 0.6
                        font.bold: true
                        text: parseInt(root.state) === OmobiDisplayBackend.Scanning ? "...":"?"
                    }
                }

                Text {
                    id: noDisplaysText
                    anchors {
                        top: noDisplaysRect.bottom
                        topMargin: noDisplaysRect.height * 0.15
                        horizontalCenter: parent.horizontalCenter
                    }

                    font.bold: true
                    font.pixelSize: noDisplaysRect.height * 0.3

                    color: Qt.darker("lightgrey", 1.1)
                    text: parseInt(root.state) === OmobiDisplayBackend.Scanning ? qsTr("Still scanning"):qsTr("No displays found")
                }
            }
        }
    }

    Dialog {
        id: authenticationDialog

        property bool shouldBeOpened: false

        parent: Overlay.overlay
        x: (parent.width - width) / 2
        y: (parent.height - height) / 2

        width: parent.width * 0.9

        modal: true
        closePolicy: Popup.NoAutoClose
        standardButtons: Dialog.Ok | Dialog.Cancel

        title: qsTr("Input code")

        onShouldBeOpenedChanged:  {
            if(shouldBeOpened)
                open()
            else
                close()
        }

        onAccepted: {
            backend.authenticate(secretTextInput.text)
        }

        onRejected: {
            backend.bleClient.disconnectFromDevice()
        }

        contentItem: TextField {
            id: secretTextInput
            placeholderText: qsTr("code")
            Keys.onReturnPressed: authenticationDialog.accept()
        }
    }

    states: [
        State {
            name: OmobiDisplayBackend.Idle

            PropertyChanges {
                target: root
                statusText: qsTr("Tap here to scan")
                working: false
            }
        },
        State {
            name: OmobiDisplayBackend.Scanning

            PropertyChanges {
                target: root
                statusText: qsTr("Scanning...")
                working: true
            }
        },
        State {
            name: OmobiDisplayBackend.ReadyToConnect

            PropertyChanges {
                target: root
                statusText: availableDisplaysListView.model.rowCount > 0 ? qsTr("Please select a device or tap to scan again"):qsTr("No displays found. Tap to scan again")
                working: false
            }
        },

        State {
            name: OmobiDisplayBackend.AuthenticationRequired

            PropertyChanges {
                target: authenticationDialog
                shouldBeOpened: true
            }

            PropertyChanges {
                target: availableDisplaysListView
                enabled: false
            }

            PropertyChanges {
                target: root
                statusText: qsTr("trying to authenticate...")
                working: true
            }
        },
        State {
            name: OmobiDisplayBackend.Authenticating

            PropertyChanges {
                target: availableDisplaysListView
                enabled: false
            }

            PropertyChanges {
                target: root
                statusText: qsTr("trying to authenticate...")
                working: true
            }
        },

        State {
            name: OmobiDisplayBackend.Connecting

            PropertyChanges {
                target: availableDisplaysListView
                enabled: false
            }

            PropertyChanges {
                target: root
                statusText: qsTr("trying to connect...")
                working: true
            }
        },
        State {
            name: OmobiDisplayBackend.Initing

            PropertyChanges {
                target: availableDisplaysListView
                enabled: false
            }

            PropertyChanges {
                target: root
                statusText: qsTr("loading data...")
                working: true
            }
        }
    ]
}