import DeltaChat 1.0
import QtQml.Models 2.1
import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12
import org.kde.kirigami 2.13 as Kirigami

Kirigami.ScrollablePage {
    id: chatlistPage

    required property DcContext context
    required property DcAccountsEventEmitter eventEmitter
    property bool archivedOnly: false

    function chatClicked(chatId) {
        if (chatId > 9) {
            // chatId > DC_CHAT_ID_LAST_SPECIAL
            loadChat(chatId);
        } else if (chatId == 6) {
            chatlistPage.archivedOnly = true;
            chatlist.currentIndex = -1;
            updateChatlist();
        }
    }

    function loadChat(chatId) {
        chatlistPage.context.marknoticedChat(chatId);
        console.log("Selected chat " + chatId);
        console.log("Depth is " + pageStack.depth);
        let chatPageComponent = Qt.createComponent("qrc:/qml/ChatPage.qml");
        if (chatPageComponent.status == Component.Ready) {
            let myPage = chatPageComponent.createObject(pageStack, {
                "chatId": chatId,
                "context": chatlistPage.context,
                "eventEmitter": chatlistPage.eventEmitter
            });
            if (pageStack.depth == 1) {
                pageStack.push(myPage);
            } else if (pageStack.depth == 2) {
                pageStack.currentIndex = 1;
                pageStack.replace(myPage);
            }
        } else if (chatPageComponent.status == Component.Error) {
            console.log("Error loading chat page: " + chatPageComponent.errorString());
        }
    }

    function updateChatlist() {
        // Merge new chatlist with existing one.
        // To preserve selected item, we do not simply clear and fill
        // the model from scratch.

        let chatlist = chatlistPage.context.getChatlist(chatlistPage.archivedOnly ? 1 : 0, searchField.text);
        for (let i = 0; i < chatlist.getChatCount(); i++) {
            const summary = chatlist.getSummary(i);
            const chatId = chatlist.getChatId(i);
            const chat = chatlistPage.context.getChat(chatId);
            const profileImage = chat.getProfileImage();
            const item = {
                "chatId": chatId,
                "msgId": chatlist.getMsgId(i),
                "username": (summary.text1 != "" ? summary.text1 + ": " : "") + summary.text2,
                "avatarSource": profileImage ? "file:" + profileImage : "",
                "chatName": chat.name,
                "freshMsgCnt": chatlistPage.context.getFreshMsgCnt(chatId),
                "isContactRequest": chat.isContactRequest,
                "visibility": chat.visibility
            };
            let j;
            for (j = i; j < chatlistModel.count; j++) {
                if (chatlistModel.get(j).chatId == chatId) {
                    // This chat was already in the chatlist,
                    // move it to the new place and update.
                    chatlistModel.move(j, i, 1);
                    chatlistModel.set(i, item);
                    break;
                }
            }
            // This chat is new, insert it.
            if (j == chatlistModel.count)
                chatlistModel.insert(i, item);

        }
        // Remove any chats that are not present in the new chatlist.
        if (chatlistModel.count > chatlist.getChatCount())
            chatlistModel.remove(chatlist.getChatCount(), chatlistModel.count - chatlist.getChatCount());

    }

    title: qsTr("Chats")
    Component.onCompleted: {
        updateChatlist();
    }
    contextualActions: [
        Kirigami.Action {
            text: "Settings"
            iconName: "configure"
            onTriggered: {
                let settingsPageComponent = Qt.createComponent("qrc:/qml/SettingsPage.qml");
                if (settingsPageComponent.status == Component.Ready) {
                    let settingsPage = settingsPageComponent.createObject(pageStack, {
                        "context": chatlistPage.context
                    });
                    pageStack.layers.push(settingsPage);
                } else {
                    console.log("Can't open Settings page");
                }
            }
        }
    ]

    Connections {
        function onMessagesChanged() {
            // Reload chatlist
            updateChatlist();
        }

        function onMessagesNoticed() {
            // Reload chatlist
            updateChatlist();
        }

        function onChatModified() {
            // Reload chatlist
            updateChatlist();
        }

        target: chatlistPage.eventEmitter
    }

    ListModel {
        id: chatlistModel
    }

    ListView {
        id: chatlist

        anchors.fill: parent
        model: chatlistModel

        delegate: ChatlistItem {
            context: chatlistPage.context
            chatId: model.chatId
            chatName: model.chatName
            avatarSource: model.avatarSource
            username: model.username
            freshMsgCnt: model.freshMsgCnt
            isContactRequest: model.isContactRequest
            isPinned: model.visibility == 2
            width: chatlist.width
            onClicked: chatClicked(model.chatId)
        }

    }

    header: Kirigami.SearchField {
        id: searchField

        onTextChanged: chatlistPage.updateChatlist()
    }

    mainAction: Kirigami.Action {
        text: "New chat"
        iconName: "list-add"
        onTriggered: {
            let newChatPageComponent = Qt.createComponent("qrc:/qml/NewChatPage.qml");
            if (newChatPageComponent.status == Component.Ready) {
                let newChatPage = newChatPageComponent.createObject(pageStack, {
                    "context": chatlistPage.context
                });
                pageStack.layers.push(newChatPage);
            } else if (newChatPageComponent.status == Component.Error) {
                console.log("Error loading new chat page: " + newChatPageComponent.errorString());
            }
        }
    }

}