/*
    SPDX-FileCopyrightText: 2016 David Edmundson <davidedmundson@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

import QtQuick 2.2

import QtQuick.Layouts 1.1
import QtQuick.Controls 2.12 as QQC2

import org.kde.plasma.components 3.0 as PlasmaComponents3
import org.kde.plasma.extras 2.0 as PlasmaExtras
import org.kde.kirigami 2.20 as Kirigami
import org.kde.kscreenlocker 1.0 as ScreenLocker

import org.kde.breeze.components

SessionManagementScreen {
    id: sessionManager

    readonly property alias mainPasswordBox: passwordBox
    property bool lockScreenUiVisible: false
    property alias showPassword: passwordBox.showPassword

    //the y position that should be ensured visible when the on screen keyboard is visible
    property int visibleBoundary: mapFromItem(loginButton, 0, 0).y
    onHeightChanged: visibleBoundary = mapFromItem(loginButton, 0, 0).y + loginButton.height + Kirigami.Units.smallSpacing
    /*
     * Login has been requested with the following username and password
     * If username field is visible, it will be taken from that, otherwise from the "name" property of the currentIndex
     */
    signal passwordResult(string password)

    onUserSelected: {
        const nextControl = (passwordBox.visible ? passwordBox : loginButton);
        // Don't startLogin() here, because the signal is connected to the
        // Escape key as well, for which it wouldn't make sense to trigger
        // login. Using TabFocusReason, so that the loginButton gets the
        // visual highlight.
        nextControl.forceActiveFocus(Qt.TabFocusReason);
    }

    function startLogin() {
        const password = passwordBox.text

        // This is partly because it looks nicer, but more importantly it
        // works round a Qt bug that can trigger if the app is closed with a
        // TextField focused.
        //
        // See https://bugreports.qt.io/browse/QTBUG-55460
        loginButton.forceActiveFocus();
        passwordResult(password);
    }

    RowLayout {
        Layout.fillWidth: true

        PlasmaExtras.PasswordField {
            id: passwordBox
            font.pointSize: Kirigami.Theme.defaultFont.pointSize + 1
            Layout.fillWidth: true

            placeholderText: i18nd("plasma_shell_org.kde.plasma.desktop", "Password")
            focus: true
            enabled: !authenticator.graceLocked

            // In Qt this is implicitly active based on focus rather than visibility
            // in any other application having a focussed invisible object would be weird
            // but here we are using to wake out of screensaver mode
            // We need to explicitly disable cursor flashing to avoid unnecessary renders
            cursorVisible: visible

            onAccepted: {
                if (lockScreenUiVisible) {
                    startLogin();
                }
            }

            //if empty and left or right is pressed change selection in user switch
            //this cannot be in keys.onLeftPressed as then it doesn't reach the password box
            Keys.onPressed: event => {
                if (event.key === Qt.Key_Left && !text) {
                    userList.decrementCurrentIndex();
                    event.accepted = true
                }
                if (event.key === Qt.Key_Right && !text) {
                    userList.incrementCurrentIndex();
                    event.accepted = true
                }
            }

            Connections {
                target: root
                function onClearPassword() {
                    passwordBox.forceActiveFocus()
                    passwordBox.text = "";
                }
                function onNotificationRepeated() {
                    sessionManager.playHighlightAnimation();
                }
            }
        }

        PlasmaComponents3.Button {
            id: loginButton
            Accessible.name: i18nd("plasma_shell_org.kde.plasma.desktop", "Unlock")
            Layout.preferredHeight: passwordBox.implicitHeight
            Layout.preferredWidth: loginButton.Layout.preferredHeight

            icon.name: LayoutMirroring.enabled ? "go-previous" : "go-next"

            onClicked: startLogin()
            Keys.onEnterPressed: clicked()
            Keys.onReturnPressed: clicked()
        }
    }

    component FailableLabel : PlasmaComponents3.Label {
        id: _failableLabel
        required property int kind
        required property string label

        visible: authenticator.authenticatorTypes & kind
        text: label
        textFormat: Text.PlainText
        horizontalAlignment: Text.AlignHCenter
        Layout.fillWidth: true

        RejectPasswordAnimation {
            id: _rejectAnimation
            target: _failableLabel
            onFinished: _timer.restart()
        }

        Connections {
            target: authenticator
            function onNoninteractiveError(kind, authenticator) {
                if (kind & _failableLabel.kind) {
                    _failableLabel.text = Qt.binding(() => authenticator.errorMessage)
                    _rejectAnimation.start()
                }
            }
        }
        Timer {
            id: _timer
            interval: Kirigami.Units.humanMoment
            onTriggered: {
                _failableLabel.text = Qt.binding(() => _failableLabel.label)
            }
        }
    }

    FailableLabel {
        kind: ScreenLocker.Authenticator.Fingerprint
        label: i18nd("plasma_shell_org.kde.plasma.desktop", "(or scan your fingerprint on the reader)")
    }
    FailableLabel {
        kind: ScreenLocker.Authenticator.Smartcard
        label: i18nd("plasma_shell_org.kde.plasma.desktop", "(or scan your smartcard)")
    }
}