/**
 * SPDX-FileCopyrightText: 2018-2020 Black Hat <bhat@encom.eu.org>
 * SPDX-FileCopyrightText: 2020 Carl Schwan <carl@carlschwan.eu>
 *
 * SPDX-License-Identifier: GPL-3.0-only
 */
import QtQuick 2.12
import QtQuick.Controls 2.12 as QQC2
import QtQuick.Layouts 1.12
import Qt.labs.qmlmodels 1.0
import Qt.labs.platform 1.0 as Platform
import QtQuick.Controls.Material 2.12

import org.kde.kirigami 2.13 as Kirigami
import org.kde.kitemmodels 1.0
import org.kde.neochat 1.0

import NeoChat.Component 1.0
import NeoChat.Component.Timeline 1.0
import NeoChat.Dialog 1.0
import NeoChat.Menu.Timeline 1.0

Kirigami.ScrollablePage {
    id: page

    property var currentRoom

    signal switchRoomUp()
    signal switchRoomDown()

    title: currentRoom.name
    titleDelegate: Component {
        RowLayout {
            visible: !Kirigami.Settings.isMobile
            Layout.fillWidth: true
            Layout.maximumWidth: implicitWidth + 1 // The +1 is to make sure we do not trigger eliding at max width
            Layout.minimumWidth: 0
            spacing: Kirigami.Units.gridUnit * 0.8
            Kirigami.Heading {
                id: titleLabel
                level: 2
                Layout.alignment: Qt.AlignVCenter
                text: page.title
                opacity: page.isCurrentPage ? 1 : 0.4
                maximumLineCount: 1
                elide: Text.ElideRight
            }
            QQC2.Label {
                Layout.fillWidth: true
                Layout.alignment: Qt.AlignVCenter
                anchors.baseline: lineCount < 2 ? titleLabel.baseline : undefined // necessary, since there is no way to do this with Layout.alignment
                text: currentRoom.topic
                maximumLineCount: 2
                wrapMode: Text.Wrap
                elide: Text.ElideRight
                color: Kirigami.Theme.disabledTextColor
                font.pointSize: Kirigami.Theme.defaultFont.pointSize * 0.9
            }
        }
    }
    focus: true

    Keys.onTabPressed: {
        if (event.modifiers & Qt.ControlModifier) {
            switchRoomDown();
        }
    }

    Keys.onBacktabPressed: {
        if (event.modifiers & Qt.ControlModifier) {
            switchRoomUp();
        }
    }

    Keys.onPressed: {
        if (event.key === Qt.Key_PageDown) {
            switchRoomDown();
        } else if (event.key === Qt.Key_PageUp) {
            switchRoomUp();
        } else if (!(event.modifiers & Qt.ControlModifier) && event.key < Qt.Key_Escape) {
            event.accepted = true;
            chatTextInput.addText(event.text);
            chatTextInput.focus();
            return;
        }
    }

    ListView {
        id: messageListView

        readonly property int largestVisibleIndex: count > 0 ? indexAt(contentX + (width / 2), contentY + height - 1) : -1
        readonly property bool noNeedMoreContent: !currentRoom || currentRoom.eventsHistoryJob || currentRoom.allHistoryLoaded
        readonly property bool isLoaded: page.width * page.height > 10

        spacing: Kirigami.Units.smallSpacing
        clip: true

        verticalLayoutDirection: ListView.BottomToTop
        highlightMoveDuration: 500

        model: !isLoaded ? undefined : sortedMessageEventModel

        onContentYChanged: updateReadMarker()
        onCountChanged: updateReadMarker()

        function updateReadMarker() {
            if(!noNeedMoreContent && contentY  - 5000 < originY)
                currentRoom.getPreviousContent(20);
            const index = eventToIndex(currentRoom.readMarkerEventId)
            if(index === -1) {
                return
            }
            if(firstVisibleIndex() === -1 || lastVisibleIndex() === -1) {
                return
            }
            if(index < firstVisibleIndex() && index > lastVisibleIndex()) {
                currentRoom.readMarkerEventId = sortedMessageEventModel.data(sortedMessageEventModel.index(lastVisibleIndex(), 0), MessageEventModel.EventIdRole)
            }
        }

        MessageEventModel {
            id: messageEventModel

            room: currentRoom
        }

        Kirigami.PlaceholderMessage {
            anchors.centerIn: parent
            visible: messageListView.count === 0 && !currentRoom.allHistoryLoaded
            QQC2.BusyIndicator {
                running: true
            }
        }

        QQC2.Popup {
            anchors.centerIn: parent

            id: attachDialog

            padding: 16

            contentItem: RowLayout {
                QQC2.ToolButton {
                    Layout.preferredWidth: 160
                    Layout.fillHeight: true

                    icon.name: 'mail-attachment'

                    text: i18n("Choose local file")

                    onClicked: {
                        attachDialog.close()

                        var fileDialog = openFileDialog.createObject(ApplicationWindow.overlay)

                        fileDialog.chosen.connect(function(path) {
                            if (!path) return

                            chatTextInput.attach(path)
                        })

                        fileDialog.open()
                    }
                }

                Kirigami.Separator {}

                QQC2.ToolButton {
                    Layout.preferredWidth: 160
                    Layout.fillHeight: true

                    padding: 16

                    icon.name: 'insert-image'
                    text: i18n("Clipboard image")
                    onClicked: {
                        var localPath = Platform.StandardPaths.writableLocation(Platform.StandardPaths.CacheLocation) + "/screenshots/" + (new Date()).getTime() + ".png"
                        if (!Clipboard.saveImage(localPath)) return
                        chatTextInput.attach(localPath)
                        attachDialog.close()
                    }
                }
            }
        }

        Component {
            id: openFileDialog

            OpenFileDialog {}
        }


        KSortFilterProxyModel {
            id: sortedMessageEventModel

            sourceModel: messageEventModel

            filterRowCallback: Config.showLeaveJoinEvent ? dontFilterLeaveJoin : filterLeaveJoin

            function dontFilterLeaveJoin(row, parent) {
                return messageEventModel.data(messageEventModel.index(row, 0), MessageEventModel.MessageRole) !== 0x10
                    && messageEventModel.data(messageEventModel.index(row, 0), MessageEventModel.EventTypeRole) !== "other";
            }

            function filterLeaveJoin(row, parent) {
                return messageEventModel.data(messageEventModel.index(row, 0), MessageEventModel.MessageRole) !== 0x10
                    && messageEventModel.data(messageEventModel.index(row, 0), MessageEventModel.EventTypeRole) !== "other"
                    && messageEventModel.data(messageEventModel.index(row, 0), MessageEventModel.EventTypeRole) !== "state";
            }
        }

        //        populate: Transition {
        //            NumberAnimation {
        //                property: "opacity"; from: 0; to: 1
        //                duration: 200
        //            }
        //        }

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

        //        move: Transition {
        //            NumberAnimation {
        //                property: "y"; duration: 200
        //            }
        //            NumberAnimation {
        //                property: "opacity"; to: 1
        //            }
        //        }

        //        displaced: Transition {
        //            NumberAnimation {
        //                property: "y"; duration: 200
        //                easing.type: Easing.OutQuad
        //            }
        //            NumberAnimation {
        //                property: "opacity"; to: 1
        //            }
        //        }

        delegate: DelegateChooser {
            id: timelineDelegateChooser
            role: "eventType"

            DelegateChoice {
                roleValue: "state"
                delegate: TimelineContainer {
                    width: messageListView.width

                    innerObject: StateDelegate {
                        Layout.maximumWidth: parent.width
                        Layout.alignment: Qt.AlignHCenter
                    }
                }
            }

            DelegateChoice {
                roleValue: "emote"
                delegate: TimelineContainer {
                    width: messageListView.width
                    innerObject: MessageDelegate {
                        Layout.fillWidth: true
                        Layout.maximumWidth: messageListView.width
                        isEmote: true
                        mouseArea: MouseArea {
                            acceptedButtons: Qt.RightButton
                            anchors.fill: parent
                            onClicked: openMessageContext(author, display, eventId, toolTip);
                        }
                        onReplyClicked: goToEvent(eventID)
                        onReplyToMessageClicked: replyToMessage(replyUser, replyContent, eventId);
                        innerObject: [
                            TextDelegate {
                                isEmote: true
                                Layout.fillWidth: true
                                Layout.rightMargin: Kirigami.Units.largeSpacing
                            },
                            ReactionDelegate {
                                Layout.fillWidth: true
                                Layout.topMargin: 0
                                Layout.bottomMargin: Kirigami.Units.largeSpacing * 2
                            }
                        ]
                    }
                }
            }

            DelegateChoice {
                roleValue: "message"
                delegate: TimelineContainer {
                    width: messageListView.width
                    innerObject: MessageDelegate {
                        Layout.fillWidth: true
                        Layout.maximumWidth: messageListView.width
                        onReplyClicked: goToEvent(eventID)
                        onReplyToMessageClicked: replyToMessage(replyUser, replyContent, eventId);
                        innerObject: [
                            MouseArea {
                                acceptedButtons: (Kirigami.Settings.isMobile ? Qt.LeftButton : 0) | Qt.RightButton
                                anchors.fill: parent
                                onClicked: {
                                    if (mouse.button == Qt.RightButton) {
                                        openMessageContext(author, display, eventId, toolTip);
                                    }
                                }
                                onPressAndHold: openMessageContext(author, display, eventId, toolTip);
                            },
                            TextDelegate {
                                Layout.fillWidth: true
                                Layout.rightMargin: Kirigami.Units.largeSpacing
                            },
                            ReactionDelegate {
                                Layout.fillWidth: true
                                Layout.topMargin: 0
                                Layout.bottomMargin: Kirigami.Units.largeSpacing * 2
                            }
                        ]
                    }
                }
            }

            DelegateChoice {
                roleValue: "notice"
                delegate: TimelineContainer {
                    width: messageListView.width

                    innerObject: MessageDelegate {
                        Layout.fillWidth: true
                        onReplyClicked: goToEvent(eventID)
                        onReplyToMessageClicked: replyToMessage(replyUser, replyContent, eventId);

                        innerObject: TextDelegate {
                            Layout.fillWidth: true
                        }
                    }
                }
            }

            DelegateChoice {
                roleValue: "image"
                delegate: TimelineContainer {
                    width: messageListView.width

                    innerObject: MessageDelegate {
                        Layout.fillWidth: true
                        onReplyClicked: goToEvent(eventID)
                        onReplyToMessageClicked: replyToMessage(replyUser, replyContent, eventId);

                        innerObject: [
                            ImageDelegate {
                                Layout.maximumWidth: parent.width
                                Layout.minimumWidth: 320
                                Layout.preferredHeight: info.h / info.w * width
                            },
                            ReactionDelegate {
                                Layout.fillWidth: true
                                Layout.topMargin: 0
                                Layout.maximumHeight: 320
                                Layout.bottomMargin: 8
                            }
                        ]
                    }
                }
            }

            DelegateChoice {
                roleValue: "audio"
                delegate: TimelineContainer {
                    width: messageListView.width

                    innerObject: MessageDelegate {
                        Layout.fillWidth: true
                        onReplyClicked: goToEvent(eventID)
                        mouseArea: MouseArea {
                            acceptedButtons: (Kirigami.Settings.isMobile ? Qt.LeftButton : 0) | Qt.RightButton
                            anchors.fill: parent
                            onClicked: {
                                if (mouse.button == Qt.RightButton) {
                                    openMessageContext(author, display, eventId, toolTip);
                                }
                            }
                            onPressAndHold: openMessageContext(author, display, eventId, toolTip);
                        }
                        onReplyToMessageClicked: replyToMessage(replyUser, replyContent, eventId);

                        innerObject: AudioDelegate {
                            Layout.fillWidth: true
                        }
                    }
                }
            }

            DelegateChoice {
                roleValue: "video"
                delegate: TimelineContainer {
                    width: messageListView.width

                    innerObject: MessageDelegate {
                        Layout.fillWidth: true
                        onReplyClicked: goToEvent(eventID)
                        mouseArea: MouseArea {
                            acceptedButtons: (Kirigami.Settings.isMobile ? Qt.LeftButton : 0) | Qt.RightButton
                            anchors.fill: parent
                            onClicked: {
                                if (mouse.button == Qt.RightButton) {
                                    openMessageContext(author, display, eventId, toolTip);
                                }
                            }
                            onPressAndHold: openMessageContext(author, display, eventId, toolTip);
                        }
                        onReplyToMessageClicked: replyToMessage(replyUser, replyContent, eventId);

                        innerObject: VideoDelegate {
                            Layout.maximumWidth: parent.width
                            Layout.minimumWidth: 320
                            Layout.maximumHeight: 320
                            Layout.preferredHeight: content.info.h / content.info.w * width
                        }
                    }
                }
            }

            DelegateChoice {
                roleValue: "file"
                delegate: TimelineContainer {
                    width: messageListView.width

                    innerObject: MessageDelegate {
                        Layout.fillWidth: true
                        onReplyClicked: goToEvent(eventID)
                        onReplyToMessageClicked: replyToMessage(replyUser, replyContent, eventId);

                        innerObject: FileDelegate {
                            Layout.fillWidth: true
                        }
                    }
                }
            }

            DelegateChoice {
                roleValue: "other"
                delegate: Item {}
            }
        }

        QQC2.RoundButton {
            anchors.right: parent.right
            anchors.top: parent.top
            anchors.topMargin: Kirigami.Units.largeSpacing
            anchors.rightMargin: Kirigami.Units.largeSpacing
            implicitWidth: Kirigami.Units.gridUnit * 2
            implicitHeight: Kirigami.Units.gridUnit * 2

            padding: 8

            id: goReadMarkerFab

            visible: currentRoom && currentRoom.hasUnreadMessages && currentRoom.readMarkerLoaded || !messageListView.atYEnd
            action: Kirigami.Action {
                onTriggered: {
                    if (currentRoom && currentRoom.hasUnreadMessages) {
                        goToEvent(currentRoom.readMarkerEventId)
                    } else {
                        currentRoom.markAllMessagesAsRead()
                        messageListView.positionViewAtBeginning()
                    }
                }
                icon.name: currentRoom && currentRoom.hasUnreadMessages ? "go-up" : "go-down"
            }

            QQC2.ToolTip {
                text: currentRoom && currentRoom.hasUnreadMessages ? i18n("Jump to first unread message") : i18n("Jump to latest message")
            }
        }

        header: RowLayout {
            id: typingNotification

            visible: currentRoom && currentRoom.usersTyping.length > 0
            height: visible ? implicitHeight: 0
            spacing: Kirigami.Units.largeSpacing

            QQC2.BusyIndicator {
                Layout.preferredWidth: Kirigami.Units.iconSizes.smallMedium
                Layout.preferredHeight: Kirigami.Units.iconSizes.smallMedium
            }
            QQC2.Label {
                text: visible ? i18ncp("Message displayed when some users are typing", "%2 is typing", "%2 are typing", currentRoom.usersTyping.length, currentRoom.usersTyping.map(user => user.displayName).join(", ")) : ""
            }
        }


        Component.onCompleted: {
            updateReadMarker()
            if (currentRoom) {
                if (currentRoom.timelineSize < 20)
                    currentRoom.getPreviousContent(50)
            }

            positionViewAtBeginning()
        }

        DropArea {
            id: dropAreaFile
            anchors.fill: parent
            onDropped: chatTextInput.attach(drop.urls[0])
        }

        QQC2.Pane {
            visible: dropAreaFile.containsDrag
            anchors {
                fill: parent
                margins: Kirigami.Units.gridUnit
            }

            Kirigami.PlaceholderMessage {
                anchors.centerIn: parent
                width: parent.width - (Kirigami.Units.largeSpacing * 4)
                text: i18n("Drag items here to share them")
            }
        }

        Component {
            id: messageDelegateContextMenu

            MessageDelegateContextMenu {}
        }

        Component {
            id: messageSourceSheet

            MessageSourceSheet {}
        }
    }

    footer: ChatTextInput {
        id: chatTextInput
        Layout.fillWidth: true
    }

    Kirigami.Theme.colorSet: Kirigami.Theme.View

    function goToEvent(eventID) {
        messageListView.positionViewAtIndex(eventToIndex(eventID), ListView.Contain)
    }

    function eventToIndex(eventID) {
        const index = messageEventModel.eventIDToIndex(eventID)
        if (index === -1)
            return -1
        return sortedMessageEventModel.mapFromSource(messageEventModel.index(index, 0)).row
    }

    function firstVisibleIndex() {
        let center = messageListView.x + messageListView.width / 2;
        let index = -1
        let i = 0
        while(index === -1 && i < 100) {
            index = messageListView.indexAt(center, messageListView.y + messageListView.contentY + i);
            i++;
        }
        return index
    }

    function lastVisibleIndex() {
        let center = messageListView.x + messageListView.width / 2;
        let index = -1
        let i = 0
        while(index === -1 && i < 100) {
            index = messageListView.indexAt(center, messageListView.y + messageListView.contentY + messageListView.height - i);
            i++
        }
        return index;
    }

    function openMessageContext(author, message, eventId, toolTip, model) {
        const contextMenu = messageDelegateContextMenu.createObject(page, {
            'author': author,
            'message': message,
            'eventId': eventId,
        });
        contextMenu.viewSource.connect(function() {
            messageSourceSheet.createObject(page, {
                'sourceText': toolTip,
            }).open();
            contextMenu.close();
        });
        contextMenu.reply.connect(function(replyUser, replyContent) {
            replyToMessage(replyUser, replyContent, eventId);
            contextMenu.close();
        })
        contextMenu.remove.connect(function() {
            currentRoom.redactEvent(eventId);
            contextMenu.close();
        })
        contextMenu.open()
    }

    function replyToMessage(replyUser, replyContent, eventId) {
        chatTextInput.replyUser = replyUser;
        chatTextInput.replyEventID = eventId;
        chatTextInput.replyContent = replyContent;
        chatTextInput.isReply = true;
        chatTextInput.focus();
    }
}