/*
 * Copyright (C) 2013 Canonical, Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import QtQuick 2.0
import QtQuick.Window 2.0
import AccountsService 0.1
import GSettings 1.0
import Unity.Application 0.1
import Ubuntu.Components 0.1
import Ubuntu.Components.Popups 1.0
import Ubuntu.Gestures 0.1
import Ubuntu.Telephony 0.1 as Telephony
import Unity.Connectivity 0.1
import Unity.Launcher 0.1
import Utils 0.1
import LightDM 0.1 as LightDM
import Powerd 0.1
import SessionBroadcast 0.1
import "Greeter"
import "Launcher"
import "Panel"
import "Components"
import "Notifications"
import "Stages"
import "Panel/Indicators"
import "Wizard"
import Unity.Notifications 1.0 as NotificationBackend
import Unity.Session 0.1
import Unity.DashCommunicator 0.1

Item {
    id: shell

    // this is only here to select the width / height of the window if not running fullscreen
    property bool tablet: false
    width: tablet ? units.gu(160) : applicationArguments.hasGeometry() ? applicationArguments.width() : units.gu(40)
    height: tablet ? units.gu(100) : applicationArguments.hasGeometry() ? applicationArguments.height() : units.gu(71)

    enabled: !greeter.waiting

    property real edgeSize: units.gu(2)
    property url defaultBackground: Qt.resolvedUrl(shell.width >= units.gu(60) ? "graphics/tablet_background.jpg" : "graphics/phone_background.jpg")
    property url background: asImageTester.status == Image.Ready ? asImageTester.source
                             : gsImageTester.status == Image.Ready ? gsImageTester.source : defaultBackground
    readonly property real panelHeight: panel.panelHeight

    readonly property alias locked: greeter.locked

    property bool sideStageEnabled: shell.width >= units.gu(100)
    readonly property string focusedApplicationId: ApplicationManager.focusedApplicationId

    property int maxFailedLogins: -1 // disabled by default for now, will enable via settings in future
    property int failedLoginsDelayAttempts: 7 // number of failed logins
    property int failedLoginsDelayMinutes: 5 // minutes of forced waiting

    property int orientation
    readonly property int deviceOrientationAngle: Screen.angleBetween(Screen.primaryOrientation, Screen.orientation)
    onDeviceOrientationAngleChanged: {
        if (!OrientationLock.enabled) {
            orientation = Screen.orientation;
        }
    }
    readonly property bool orientationLockEnabled: OrientationLock.enabled
    onOrientationLockEnabledChanged: {
        if (orientationLockEnabled) {
            OrientationLock.savedOrientation = Screen.orientation;
        } else {
            orientation = Screen.orientation;
        }
    }

    function activateApplication(appId) {
        if (ApplicationManager.findApplication(appId)) {
            ApplicationManager.requestFocusApplication(appId);
        } else {
            var execFlags = shell.sideStageEnabled ? ApplicationManager.NoFlag : ApplicationManager.ForceMainStage;
            ApplicationManager.startApplication(appId, execFlags);
        }
    }

    function startLockedApp(app) {
        if (shell.locked) {
            greeter.lockedApp = app;
        }
        shell.activateApplication(app);
    }

    // This is a dummy image to detect if the custom AS set wallpaper loads successfully.
    Image {
        id: asImageTester
        source: AccountsService.backgroundFile != undefined && AccountsService.backgroundFile.length > 0 ? AccountsService.backgroundFile : ""
        height: 0
        width: 0
        sourceSize.height: 0
        sourceSize.width: 0
    }

    GSettings {
        id: backgroundSettings
        schema.id: "org.gnome.desktop.background"
    }

    // This is a dummy image to detect if the custom GSettings set wallpaper loads successfully.
    Image {
        id: gsImageTester
        source: backgroundSettings.pictureUri != undefined && backgroundSettings.pictureUri.length > 0 ? backgroundSettings.pictureUri : ""
        height: 0
        width: 0
        sourceSize.height: 0
        sourceSize.width: 0
    }

    Binding {
        target: LauncherModel
        property: "applicationManager"
        value: ApplicationManager
    }

    Component.onCompleted: {
        Theme.name = "Ubuntu.Components.Themes.SuruGradient"
        if (ApplicationManager.count > 0) {
            ApplicationManager.focusApplication(ApplicationManager.get(0).appId);
        }
        if (orientationLockEnabled) {
            orientation = OrientationLock.savedOrientation;
        }
        Connectivity.unlockAllModems();
    }

    VolumeControl {
        id: volumeControl
    }

    DashCommunicator {
        id: dash
        objectName: "dashCommunicator"
    }

    ScreenGrabber {
        id: screenGrabber
        z: edgeDemo.z + 10
        enabled: Powerd.status === Powerd.On
    }

    Binding {
        target: ApplicationManager
        property: "forceDashActive"
        value: launcher.shown || launcher.dashSwipe
    }

    VolumeKeyFilter {
        id: volumeKeyFilter
        onVolumeDownPressed: volumeControl.volumeDown()
        onVolumeUpPressed: volumeControl.volumeUp()
        onBothVolumeKeysPressed: screenGrabber.capture()
    }

    WindowKeysFilter {
        Keys.onPressed: {
            if (event.key == Qt.Key_PowerOff || event.key == Qt.Key_PowerDown) {
                dialogs.onPowerKeyPressed();
                event.accepted = true;
            } else {
                volumeKeyFilter.onKeyPressed(event.key);
                event.accepted = false;
            }
        }

        Keys.onReleased: {
            if (event.key == Qt.Key_PowerOff || event.key == Qt.Key_PowerDown) {
                dialogs.onPowerKeyReleased();
                event.accepted = true;
            } else {
                volumeKeyFilter.onKeyReleased(event.key);
                event.accepted = false;
            }
        }
    }

    Item {
        id: stages
        objectName: "stages"
        width: parent.width
        height: parent.height
        visible: !ApplicationManager.empty

        Connections {
            target: ApplicationManager

            onFocusRequested: {
                if (appId === "dialer-app" && callManager.hasCalls && greeter.locked) {
                    // If we are in the middle of a call, make dialer lockedApp and show it.
                    // This can happen if user backs out of dialer back to greeter, then
                    // launches dialer again.
                    lockedApp = appId;
                }

                greeter.notifyAppFocused(appId);
            }

            onFocusedApplicationIdChanged: {
                greeter.notifyFocusChanged(ApplicationManager.focusedApplicationId);
                panel.indicators.hide();
            }

            onApplicationAdded: {
                if (edgeDemo.running && appId != "unity8-dash") {
                    // If this happens on first boot, we may be in edge
                    // tutorial or wizard while receiving a call.  But a call
                    // is more important than wizard so just bail out of those.
                    edgeDemo.hideEdgeDemos();
                    wizard.hide();
                }

                greeter.notifyAppAdded(appId);
                launcher.hide();
            }
        }

        Loader {
            id: applicationsDisplayLoader
            objectName: "applicationsDisplayLoader"
            anchors.fill: parent

            // When we have a locked app, we only want to show that one app.
            // FIXME: do this in a less traumatic way.  We currently only allow
            // locked apps in phone mode (see FIXME in Lockscreen component in
            // this same file).  When that changes, we need to do something
            // nicer here.  But this code is currently just to prevent a
            // theoretical attack where user enters lockedApp mode, then makes
            // the screen larger (maybe connects to monitor) and tries to enter
            // tablet mode.
            property bool tabletMode: shell.sideStageEnabled && !greeter.hasLockedApp
            source: tabletMode ? "Stages/TabletStage.qml" : "Stages/PhoneStage.qml"

            Binding {
                target: applicationsDisplayLoader.item
                property: "objectName"
                value: "stage"
            }
            Binding {
                target: applicationsDisplayLoader.item
                property: "dragAreaWidth"
                value: shell.edgeSize
            }
            Binding {
                target: applicationsDisplayLoader.item
                property: "maximizedAppTopMargin"
                // Not just using panel.panelHeight as that changes depending on the focused app.
                value: panel.indicators.minimizedPanelHeight + units.dp(2) // dp(2) for orange line
            }
            Binding {
                target: applicationsDisplayLoader.item
                property: "interactive"
                value: edgeDemo.stagesEnabled && !greeter.fullyShown && panel.indicators.fullyClosed && launcher.progress == 0 && !notifications.useModal
            }
            Binding {
                target: applicationsDisplayLoader.item
                property: "spreadEnabled"
                value: edgeDemo.stagesEnabled && !greeter.hasLockedApp
            }
            Binding {
                target: applicationsDisplayLoader.item
                property: "inverseProgress"
                value: launcher.progress
            }
            Binding {
                target: applicationsDisplayLoader.item
                property: "orientation"
                value: shell.orientation
            }
        }
    }

    InputMethod {
        id: inputMethod
        objectName: "inputMethod"
        anchors { fill: parent; topMargin: panel.panelHeight }
        z: notifications.useModal || panel.indicators.shown ? overlay.z + 1 : overlay.z - 1
    }

    Connections {
        target: SurfaceManager
        onSurfaceCreated: {
            if (surface.type == MirSurfaceItem.InputMethod) {
                inputMethod.surface = surface;
            }
        }

        onSurfaceDestroyed: {
            if (inputMethod.surface == surface) {
                inputMethod.surface = null;
                surface.parent = null;
            }
            if (!surface.parent) {
                // there's no one displaying it. delete it right away
                surface.release();
            }
        }
    }
    Connections {
        target: SessionManager
        onSessionStopping: {
            if (!session.parentSession && !session.application) {
                // nothing is using it. delete it right away
                session.release();
            }
        }
    }

    Greeter {
        id: greeter
        objectName: "greeter"

        hides: [launcher, panel.indicators]
        tabletMode: shell.sideStageEnabled
        launcherOffset: narrowMode ? launcher.progress : 0
        forcedUnlock: edgeDemo.running
        background: shell.background

        anchors.fill: parent
        anchors.topMargin: panel.panelHeight

        onSessionStarted: {
            launcher.hide();
        }

        onTease: launcher.tease()
        onEmergencyCall: startLockedApp("dialer-app")

        Binding {
            target: ApplicationManager
            property: "suspended"
            value: greeter.fullyShown
        }
    }

    Connections {
        id: callConnection
        target: callManager

        onHasCallsChanged: {
            if (shell.locked && callManager.hasCalls) {
                // We just received an incoming call while locked.  The
                // indicator will have already launched dialer-app for us, but
                // there is a race between "hasCalls" changing and the dialer
                // starting up.  So in case we lose that race, we'll start/
                // focus the dialer ourselves here too.  Even if the indicator
                // didn't launch the dialer for some reason (or maybe a call
                // started via some other means), if an active call is
                // happening, we want to be in the dialer.
                startLockedApp("dialer-app")
            }
        }
    }

    Connections {
        id: powerConnection
        target: Powerd

        onStatusChanged: {
            if (Powerd.status === Powerd.Off && reason !== Powerd.Proximity &&
                    !callManager.hasCalls && !edgeDemo.running) {
                greeter.showNow()
            }
        }
    }

    function showHome() {
        if (edgeDemo.running) {
            return
        }

        if (LightDM.Greeter.active) {
            greeter.startUnlock()
        }

        var animate = !LightDM.Greeter.active && !stages.shown
        dash.setCurrentScope(0, animate, false)
        ApplicationManager.requestFocusApplication("unity8-dash")
    }

    function showDash() {
        if (greeter.hasLockedApp || // just in case user gets here
            (!greeter.narrowMode && shell.locked)) {
            return
        }

        if (greeter.shown) {
            greeter.hideRight();
            launcher.fadeOut();
        }

        if (ApplicationManager.focusedApplicationId != "unity8-dash") {
            ApplicationManager.requestFocusApplication("unity8-dash")
            launcher.fadeOut();
        }
    }

    Item {
        id: overlay
        z: 10

        anchors.fill: parent

        Panel {
            id: panel
            objectName: "panel"
            anchors.fill: parent //because this draws indicator menus
            indicators {
                hides: [launcher]
                available: edgeDemo.panelEnabled && (!shell.locked || AccountsService.enableIndicatorsWhileLocked) && !greeter.hasLockedApp
                contentEnabled: edgeDemo.panelContentEnabled
                width: parent.width > units.gu(60) ? units.gu(40) : parent.width

                minimizedPanelHeight: units.gu(3)
                expandedPanelHeight: units.gu(7)

                indicatorsModel: visibleIndicators.model
            }

            VisibleIndicators {
                id: visibleIndicators
                // TODO: This should be sourced by device type (eg "desktop", "tablet", "phone"...)
                Component.onCompleted: initialise(indicatorProfile)
            }
            callHint {
                greeterShown: greeter.fullyShown
            }

            property bool topmostApplicationIsFullscreen:
                ApplicationManager.focusedApplicationId &&
                    ApplicationManager.findApplication(ApplicationManager.focusedApplicationId).fullscreen

            fullscreenMode: (topmostApplicationIsFullscreen && !LightDM.Greeter.active && launcher.progress == 0)
                            || greeter.hasLockedApp
        }

        Launcher {
            id: launcher
            objectName: "launcher"

            readonly property bool dashSwipe: progress > 0

            anchors.top: parent.top
            anchors.bottom: parent.bottom
            width: parent.width
            dragAreaWidth: shell.edgeSize
            available: edgeDemo.launcherEnabled && (!shell.locked || AccountsService.enableLauncherWhileLocked) && !greeter.hasLockedApp

            onShowDashHome: showHome()
            onDash: showDash()
            onDashSwipeChanged: {
                if (dashSwipe) {
                    dash.setCurrentScope(0, false, true)
                }
            }
            onLauncherApplicationSelected: {
                if (!edgeDemo.running) {
                    greeter.notifyAboutToStartApp(appId);
                    shell.activateApplication(appId)
                }
            }
            onShownChanged: {
                if (shown) {
                    panel.indicators.hide()
                }
            }
        }

        Wizard {
            id: wizard
            anchors.fill: parent
            background: shell.background
        }

        Rectangle {
            id: modalNotificationBackground

            visible: notifications.useModal && (notifications.state == "narrow")
            color: "#000000"
            anchors.fill: parent
            opacity: 0.9

            MouseArea {
                anchors.fill: parent
            }
        }

        Notifications {
            id: notifications

            model: NotificationBackend.Model
            margin: units.gu(1)

            y: topmostIsFullscreen ? 0 : panel.panelHeight
            width: parent.width
            height: parent.height - (topmostIsFullscreen ? 0 : panel.panelHeight)

            states: [
                State {
                    name: "narrow"
                    when: overlay.width <= units.gu(60)
                    AnchorChanges { target: notifications; anchors.left: parent.left }
                },
                State {
                    name: "wide"
                    when: overlay.width > units.gu(60)
                    AnchorChanges { target: notifications; anchors.left: undefined }
                    PropertyChanges { target: notifications; width: units.gu(38) }
                }
            ]
        }
    }

    Dialogs {
        id: dialogs
        anchors.fill: parent
        z: overlay.z + 10
        onPowerOffClicked: {
            shutdownFadeOutRectangle.enabled = true;
            shutdownFadeOutRectangle.visible = true;
            shutdownFadeOut.start();
        }
    }

    EdgeDemo {
        id: edgeDemo
        objectName: "edgeDemo"
        z: dialogs.z + 10
        paused: Powerd.status === Powerd.Off || wizard.active // Saves power
        greeter: greeter
        launcher: launcher
        panel: panel
        stages: stages
    }

    Connections {
        target: SessionBroadcast
        onShowHome: showHome()
    }

    Rectangle {
        id: shutdownFadeOutRectangle
        z: edgeDemo.z + 10
        enabled: false
        visible: false
        color: "black"
        anchors.fill: parent
        opacity: 0.0
        NumberAnimation on opacity {
            id: shutdownFadeOut
            from: 0.0
            to: 1.0
            onStopped: {
                if (shutdownFadeOutRectangle.enabled && shutdownFadeOutRectangle.visible) {
                    DBusUnitySessionService.Shutdown();
                }
            }
        }
    }

}