import QtQuick 2.13
import QtQuick.Controls 2.13
import QtQuick.Window 2.13
import QtQuick.Layouts 1.13
import QtQml.Models 2.13
import QtGraphicalEffects 1.13
import QtQuick.Dialogs 1.3

import utils 1.0
import shared 1.0
import shared.views 1.0
import shared.panels 1.0
import shared.popups 1.0
import shared.status 1.0
import shared.controls 1.0
import shared.views.chat 1.0

import "../controls"

Item {
    id: root
    //anchors.fill: parent

    property var store
    property var messageStore
    property var contactsStore

    property bool stickersLoaded: false
    property alias chatLogView: chatLogView
    property alias scrollToMessage: chatLogView.scrollToMessage

    property var messageContextMenuInst

    property real scrollY: chatLogView.visibleArea.yPosition * chatLogView.contentHeight
    property int newMessages: 0

    property int countOnStartUp: 0
    signal openStickerPackPopup(string stickerPackId)
    signal showReplyArea(string messageId, string author)

    Item {
        id: loadingMessagesIndicator
        visible: messageStore.messageModule? messageStore.messageModule.loadingHistoryMessagesInProgress : false
        anchors.top: parent.top
        anchors.left: parent.left
        height: visible? 20 : 0
        width: parent.width

        Loader {
            active: messageStore.messageModule? messageStore.messageModule.loadingHistoryMessagesInProgress : false
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.verticalCenter: parent.verticalCenter
            sourceComponent: Component {
                LoadingAnimation {
                    width: 18
                    height: 18
                }
            }
        }
    }

    ListView {
        id: chatLogView
        anchors.top: loadingMessagesIndicator.bottom
        anchors.bottom: parent.bottom
        anchors.left: parent.left
        anchors.right: parent.right
        spacing: 0
        boundsBehavior: Flickable.StopAtBounds
        clip: true
        verticalLayoutDirection: ListView.BottomToTop

        // This header and Connections is to create an invisible padding so that the chat identifier is at the top
        // The Connections is necessary, because doing the check inside the header created a binding loop (the contentHeight includes the header height
        // If the content height is smaller than the full height, we "show" the padding so that the chat identifier is at the top, otherwise we disable the Connections
        header: Item {
            height: 0
            width: chatLogView.width
        }

        function checkHeaderHeight() {
            if (!chatLogView.headerItem) {
                return
            }

            if (chatLogView.contentItem.height - chatLogView.headerItem.height < chatLogView.height) {
                chatLogView.headerItem.height = chatLogView.height - (chatLogView.contentItem.height - chatLogView.headerItem.height) - 36
            } else {
                chatLogView.headerItem.height = 0
            }
        }

        property var scrollToMessage: function (messageId, isSearch = false) {
            // Not Refactored Yet
//            delayPositioningViewTimer.msgId = messageId;
//            delayPositioningViewTimer.isSearch = isSearch;
//            delayPositioningViewTimer.restart();
        }

//        Timer {
//            id: delayPositioningViewTimer
//            interval: 1000
//            property string msgId
//            property bool isSearch
//            onTriggered: {
//                let item
//                for (let i = 0; i < messages.rowCount(); i++) {
//                    item = messageListDelegate.items.get(i);
//                    if (item.model.messageId === msgId) {
//                        chatLogView.positionViewAtIndex(i, ListView.Beginning);
//                        if (isSearch) {
//                            chatLogView.itemAtIndex(i).startMessageFoundAnimation();
//                        }
//                    }
//                }
//                msgId = "";
//                isSearch = false;
//            }
//        }

        ScrollBar.vertical: ScrollBar {
            visible: chatLogView.visibleArea.heightRatio < 1
        }

//        Connections {
//            id: contentHeightConnection
//            enabled: true
//            target: chatLogView
//            onContentHeightChanged: {
//                chatLogView.checkHeaderHeight()
//            }
//            onHeightChanged: {
//                chatLogView.checkHeaderHeight()
//            }
//        }

        Timer {
            id: timer
        }

        Button {
            readonly property int buttonPadding: 5

            id: scrollDownButton
            visible: false
            height: 32
            width: nbMessages.width + arrowImage.width + 2 * Style.current.halfPadding + (nbMessages.visible ? scrollDownButton.buttonPadding : 0)
            anchors.bottom: parent.bottom
            anchors.right: parent.right
            anchors.rightMargin: Style.current.padding
            background: Rectangle {
                color: Style.current.buttonSecondaryColor
                border.width: 0
                radius: 16
            }
            onClicked: {
                newMessages = 0
                scrollDownButton.visible = false
                chatLogView.scrollToBottom(true)
            }

            StyledText {
                id: nbMessages
                visible: newMessages > 0
                width: visible ? implicitWidth : 0
                text: newMessages
                anchors.verticalCenter: parent.verticalCenter
                anchors.left: parent.left
                color: Style.current.pillButtonTextColor
                font.pixelSize: 15
                anchors.leftMargin: Style.current.halfPadding
            }

            SVGImage {
                id: arrowImage
                width: 24
                height: 24
                anchors.verticalCenter: parent.verticalCenter
                anchors.left: nbMessages.right
                source: Style.svg("leave_chat")
                anchors.leftMargin: nbMessages.visible ? scrollDownButton.buttonPadding : 0
                rotation: -90

                ColorOverlay {
                    anchors.fill: parent
                    source: parent
                    color: Style.current.pillButtonTextColor
                }
            }

            MouseArea {
                cursorShape: Qt.PointingHandCursor
                anchors.fill: parent
                onPressed: mouse.accepted = false
            }
        }

        function scrollToBottom(force, caller) {
            if (!force && !chatLogView.atYEnd) {
                // User has scrolled up, we don't want to scroll back
                return false
            }
            if (caller && caller !== chatLogView.itemAtIndex(chatLogView.count - 1)) {
                // If we have a caller, only accept its request if it's the last message
                return false
            }
            // Call this twice and with a timer since the first scroll to bottom might have happened before some stuff loads
            // meaning that the scroll will not actually be at the bottom on switch
            // Add a small delay because images, even though they say they say they are loaed, they aren't shown yet
            Qt.callLater(chatLogView.positionViewAtBeginning)
            timer.setTimeout(function() {
                Qt.callLater(chatLogView.positionViewAtBeginning)
            }, 100);
            return true
        }

//        Connections {
        // Not Refactored Yet
//            target: root.store.chatsModelInst

//            onAppReady: {
//                chatLogView.scrollToBottom(true)
//            }
//        }

        Connections {
            target: messageStore.messageModule

            onMessageSuccessfullySent: {
                chatLogView.scrollToBottom(true)
            }

            onSendingMessageFailed: {
                sendingMsgFailedPopup.open();
            }

            // Not Refactored Yet
//            onNewMessagePushed: {
//                if (!chatLogView.scrollToBottom()) {
//                    newMessages++
//                }
//            }
        }

//        Connections {
        // Not Refactored Yet
//            target: root.store.chatsModelInst.communities

//            // Note:
//            // Whole this Connection object (both slots) should be moved to the nim side.
//            // Left here only cause we don't have a way to deal with translations on the nim side.

//            onMembershipRequestChanged: function (communityId, communityName, accepted) {
//                chatColumnLayout.currentNotificationChatId = null
//                chatColumnLayout.currentNotificationCommunityId = communityId

//                const title = "Status"
//                const message = //% "You have been accepted into the ‘%1’ community"
//                              accepted ? qsTrId("you-have-been-accepted-into-the---1--community").arg(communityName) :
//                                         //% "Your request to join the ‘%1’ community was declined"
//                                         qsTrId("your-request-to-join-the---1--community-was-declined").arg(communityName)

//                if (Qt.platform.os === "linux") {
//                    // Linux Notifications are not implemented in Nim/C++ yet
//                    return systemTray.showMessage(title, message, systemTray.icon.source, 4000)
//                }

//                root.store.chatsModelInst.showOSNotification(title,
//                                              message,
//                                              accepted? Constants.osNotificationType.acceptedIntoCommunity :
//                                                        Constants.osNotificationType.rejectedByCommunity,
//                                              communityId,
//                                              "",
//                                              "",
//                                              localAccountSensitiveSettings.useOSNotifications)
//            }

//            onMembershipRequestPushed: function (communityId, communityName, pubKey) {
//                chatColumnLayout.currentNotificationChatId = null
//                chatColumnLayout.currentNotificationCommunityId = communityId

//                //% "New membership request"
//                const title = qsTrId("new-membership-request")
//                //% "%1 asks to join ‘%2’"
//                const message = qsTrId("-1-asks-to-join---2-").arg(Utils.getContactDetailsAsJson(pubKey).displayName).arg(communityName)

//                if (Qt.platform.os === "linux") {
//                    // Linux Notifications are not implemented in Nim/C++ yet
//                    return systemTray.showMessage(title, message, systemTray.icon.source, 4000)
//                }

//                root.store.chatsModelInst.showOSNotification(title,
//                                              message,
//                                              Constants.osNotificationType.joinCommunityRequest,
//                                              communityId,
//                                              "",
//                                              "",
//                                              localAccountSensitiveSettings.useOSNotifications)
//            }
//        }

        onContentYChanged: {
            scrollDownButton.visible = contentHeight - (scrollY + height) > 400
            let loadMore = scrollDownButton.visible && scrollY < 500
            if(loadMore){
                messageStore.loadMoreMessages()
            }
        }

        model: messageStore.messagesModel

        // Not Refactored Yet
        //Component.onCompleted: scrollToBottom(true)

        delegate: MessageView {
            id: msgDelegate

            messageStore: root.messageStore
            contactsStore: root.contactsStore

            messageContextMenu: messageContextMenuInst

            messageId: model.id
            responseToMessageWithId: model.responseToMessageWithId
            senderId: model.senderId
            senderDisplayName: model.senderDisplayName
            senderLocalName: model.senderLocalName
            senderIcon: model.senderIcon
            isSenderIconIdenticon: model.isSenderIconIdenticon
            amISender: model.amISender
            message: model.messageText
            messageImage: model.messageImage
            messageTimestamp: model.timestamp
            messageOutgoingStatus: model.outgoingStatus
            messageContentType: model.contentType
            pinnedMessage: model.pinned
            messagePinnedBy: model.pinnedBy
            reactionsModel: model.reactions
            sticker: model.sticker
            stickerPack: model.stickerPack

            // This is possible since we have all data loaded before we load qml.
            // When we fetch messages to fulfill a gap we have to set them at once.
            // Also one important thing here is that messages are set in descending order
            // in terms of `timestamp` of a message, that means a message with the most
            // recent time is added at index 0.
            prevMessageIndex: index + 1
            prevMessageAsJsonObj: messageStore.getMessageByIndexAsJson(index + 1)
            nextMessageIndex: index - 1
            nextMessageAsJsonObj: messageStore.getMessageByIndexAsJson(index - 1)
            onOpenStickerPackPopup: {
                root.openStickerPackPopup(stickerPackId);
            }

            onShowReplyArea: {
                root.showReplyArea(messageId, author)
            }

            stickersLoaded: root.stickersLoaded
        }
    }

    MessageDialog {
        id: sendingMsgFailedPopup
        standardButtons: StandardButton.Ok
        //% "Failed to send message."
        text: qsTrId("failed-to-send-message-")
        icon: StandardIcon.Critical
    }
}