
/*
 * Copyright (C) 2020 by Savoir-faire Linux
 * Author: Mingrui Zhang <mingrui.zhang@savoirfairelinux.com>
 * Author: Sébastien Blin <sebastien.blin@savoirfairelinux.com>
 *
 * 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; either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 <https://www.gnu.org/licenses/>.
 */
import QtQuick 2.14
import QtQuick.Controls 2.14
import QtQuick.Layouts 1.14
import QtQuick.Controls.Universal 2.12
import QtGraphicalEffects 1.14
import net.jami.Models 1.0

import "../../commoncomponents"

Rectangle {
    id: videoCallPageRect

    property string bestName: "Best Name"
    property string bestId: "Best Id"
    property variant clickPos: "1,1"
    property int previewMargin: 15
    property int previewMarginY: previewMargin + 56
    property int previewToX: 0
    property int previewToY: 0

    property var linkedWebview: null

    signal needToShowInFullScreen

    function updateUI(accountId, convUid) {
        videoCallOverlay.handleParticipantsInfo(CallAdapter.getConferencesInfos())

        bestName = ClientWrapper.utilsAdaptor.getBestName(accountId, convUid)

        var id = ClientWrapper.utilsAdaptor.getBestId(accountId, convUid)
        bestId = (bestName !== id) ? id : ""
    }

    function setDistantRendererId(id) {
        distantRenderer.setRendererId(id)
    }

    function setLinkedWebview(webViewId) {
        linkedWebview = webViewId
        linkedWebview.needToHideConversationInCall.disconnect(
                    closeInCallConversation)
        linkedWebview.needToHideConversationInCall.connect(
                    closeInCallConversation)
    }

    function closeInCallConversation() {
        if (inVideoCallMessageWebViewStack.visible) {
            linkedWebview.resetMessagingHeaderBackButtonSource(
                        true)
            linkedWebview.setMessagingHeaderButtonsVisible(true)
            inVideoCallMessageWebViewStack.visible = false
            inVideoCallMessageWebViewStack.clear()
        }
    }

    function closeContextMenuAndRelatedWindows() {
        videoCallOverlay.closePotentialContactPicker()
    }

    function handleParticipantsInfo(infos) {
        if (infos.length === 0) {
            bestName = ClientWrapper.utilsAdaptor.getBestName(accountId, convUid)
        } else {
            bestName = ""
        }
        videoCallOverlay.handleParticipantsInfo(infos)
    }

    function previewMagneticSnap() {


        /*
         * Calculate the position where the previewRenderer should attach to.
         */
        var previewRendererCenter = Qt.point(
                    previewRenderer.x + previewRenderer.width / 2,
                    previewRenderer.y + previewRenderer.height / 2)
        var distantRendererCenter = Qt.point(
                    distantRenderer.x + distantRenderer.width / 2,
                    distantRenderer.y + distantRenderer.height / 2)

        if (previewRendererCenter.x >= distantRendererCenter.x) {
            if (previewRendererCenter.y >= distantRendererCenter.y) {


                /*
                 * Bottom right.
                 */
                previewToX = Qt.binding(function () {
                    return videoCallPageMainRect.width - previewRenderer.width - previewMargin
                })
                previewToY = Qt.binding(function () {
                    return videoCallPageMainRect.height - previewRenderer.height - previewMarginY
                })
            } else {


                /*
                 * Top right.
                 */
                previewToX = Qt.binding(function () {
                    return videoCallPageMainRect.width - previewRenderer.width - previewMargin
                })
                previewToY = previewMarginY
            }
        } else {
            if (previewRendererCenter.y >= distantRendererCenter.y) {


                /*
                 * Bottom left.
                 */
                previewToX = previewMargin
                previewToY = Qt.binding(function () {
                    return videoCallPageMainRect.height - previewRenderer.height - previewMarginY
                })
            } else {


                /*
                 * Top left.
                 */
                previewToX = previewMargin
                previewToY = previewMarginY
            }
        }
        previewRenderer.state = "geoChanging"
    }

    anchors.fill: parent

    SplitView {
        id: mainColumnLayout

        anchors.fill: parent

        orientation: Qt.Vertical

        handle: Rectangle {
            implicitWidth: videoCallPageRect.width
            implicitHeight: JamiTheme.splitViewHandlePreferredWidth
            color: SplitHandle.pressed ? JamiTheme.pressColor : (SplitHandle.hovered ? JamiTheme.hoverColor : JamiTheme.tabbarBorderColor)
        }


        Rectangle {
            id: videoCallPageMainRect
            SplitView.preferredHeight: (videoCallPageRect.height / 3) * 2
            SplitView.minimumHeight: videoCallPageRect.height / 2 + 20
            SplitView.fillWidth: true

            MouseArea {
                anchors.fill: parent
                hoverEnabled: true
                propagateComposedEvents: true

                acceptedButtons: Qt.LeftButton

                onDoubleClicked: {
                    needToShowInFullScreen()
                }

                CallOverlay {
                    id: videoCallOverlay

                    anchors.fill: parent

                    Connections {
                        target: CallAdapter

                        function onUpdateTimeText(time) {
                            videoCallOverlay.timeText = time
                            videoCallOverlay.setRecording(CallAdapter.isRecordingThisCall())
                        }

                        function onUpdateOverlay(isPaused, isAudioOnly, isAudioMuted, isVideoMuted, isRecording, isSIP, isConferenceCall, bestName) {
                            videoCallOverlay.showOnHoldImage(isPaused)
                            videoCallOverlay.updateButtonStatus(isPaused,
                                                                isAudioOnly,
                                                                isAudioMuted,
                                                                isVideoMuted,
                                                                isRecording, isSIP,
                                                                isConferenceCall)
                            videoCallPageRect.bestName = bestName
                        }

                        function onShowOnHoldLabel(isPaused) {
                            videoCallOverlay.showOnHoldImage(isPaused)
                        }
                    }

                    onOverlayChatButtonClicked: {
                        if (inVideoCallMessageWebViewStack.visible) {
                            linkedWebview.resetMessagingHeaderBackButtonSource(
                                        true)
                            linkedWebview.setMessagingHeaderButtonsVisible(
                                        true)
                            inVideoCallMessageWebViewStack.visible = false
                            inVideoCallMessageWebViewStack.clear()
                        } else {
                            linkedWebview.resetMessagingHeaderBackButtonSource(
                                        false)
                            linkedWebview.setMessagingHeaderButtonsVisible(
                                        false)
                            inVideoCallMessageWebViewStack.visible = true
                            inVideoCallMessageWebViewStack.push(
                                        linkedWebview)
                        }
                    }
                }

                DistantRenderer {
                    id: distantRenderer

                    anchors.centerIn: videoCallPageMainRect
                    z: -1

                    width: videoCallPageMainRect.width
                    height: videoCallPageMainRect.height

                    onOffsetChanged: {
                        videoCallOverlay.handleParticipantsInfo(CallAdapter.getConferencesInfos())
                    }
                }

                VideoCallPreviewRenderer {
                    id: previewRenderer


                    /*
                    * Property is used in the {} expression for height (extra dependency),
                    * it will not affect the true height expression, since expression
                    * at last will be taken only, but it will force the height to update
                    * and reevaluate getPreviewImageScalingFactor().
                    */
                    property int previewImageScalingFactorUpdated: 0

                    Connections {
                        target: CallAdapter

                        onPreviewVisibilityNeedToChange: previewRenderer.visible = visible
                    }

                    width: videoCallPageMainRect.width / 4
                    height: {
                        previewImageScalingFactorUpdated
                        return previewRenderer.width * previewRenderer.getPreviewImageScalingFactor()
                    }
                    x: videoCallPageMainRect.width - previewRenderer.width - previewMargin
                    y: videoCallPageMainRect.height - previewRenderer.height - previewMargin - 56 /* Avoid overlay */
                    z: -1

                    states: [
                        State {
                            name: "geoChanging"
                            PropertyChanges {
                                target: previewRenderer
                                x: previewToX
                                y: previewToY
                            }
                        }
                    ]

                    transitions: Transition {
                        PropertyAnimation {
                            properties: "x,y"
                            easing.type: Easing.OutExpo
                            duration: 250

                            onStopped: {
                                previewRenderer.state = ""
                            }
                        }
                    }

                    MouseArea {
                        id: dragMouseArea

                        anchors.fill: previewRenderer

                        onPressed: {
                            clickPos = Qt.point(mouse.x, mouse.y)
                        }

                        onReleased: {
                            previewRenderer.state = ""
                            previewMagneticSnap()
                        }

                        onPositionChanged: {


                            /*
                            * Calculate mouse position relative change.
                            */
                            var delta = Qt.point(mouse.x - clickPos.x,
                                                mouse.y - clickPos.y)
                            var deltaW = previewRenderer.x + delta.x + previewRenderer.width
                            var deltaH = previewRenderer.y + delta.y + previewRenderer.height


                            /*
                            * Check if the previewRenderer exceeds the border of videoCallPageMainRect.
                            */
                            if (deltaW < videoCallPageMainRect.width
                                    && previewRenderer.x + delta.x > 1)
                                previewRenderer.x += delta.x
                            if (deltaH < videoCallPageMainRect.height
                                    && previewRenderer.y + delta.y > 1)
                                previewRenderer.y += delta.y
                        }
                    }

                    onPreviewImageAvailable: {
                        previewImageScalingFactorUpdated++
                        previewImageScalingFactorUpdated--
                    }
                }
            }

            color: "transparent"
        }


        StackView {
            id: inVideoCallMessageWebViewStack

            SplitView.preferredHeight: videoCallPageRect.height / 3
            SplitView.fillWidth: true

            visible: false

            clip: true
        }
    }

    onBestNameChanged: {
        ContactAdapter.setCalleeDisplayName(bestName)
    }

    color: "black"
}