/**
 * SPDX-FileCopyrightText: 2020 Carl Schwan <carl@carlschwan.de>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12
import org.kde.kirigami 2.13 as Kirigami

import NeoChat.Component 1.0
import NeoChat.Component.Emoji 1.0
import NeoChat.Dialog 1.0
import NeoChat.Effect 1.0
import NeoChat.Setting 1.0

import org.kde.neochat 1.0

Control {
    id: root

    property alias isReply: replyItem.visible
    property bool isReaction: false
    property var replyUser
    property string replyEventID
    property string replyContent

    property alias isAutoCompleting: autoCompleteListView.visible
    property var autoCompleteModel
    property int autoCompleteBeginPosition
    property int autoCompleteEndPosition

    property bool hasAttachment: false
    property url attachmentPath

    padding: 0

    background: Rectangle {
        color: Kirigami.Theme.backgroundColor
        Kirigami.Separator {
            Rectangle {
                anchors.fill: parent
                color: Kirigami.Theme.focusColor
            }
            anchors {
                left: parent.left
                right: parent.right
                top: parent.top
            }
        }
    }

    contentItem: ColumnLayout {
        spacing: 0
        EmojiPicker {
            id: emojiPicker

            Layout.fillWidth: true

            visible: false

            textArea: inputField
            emojiModel: EmojiModel { id: emojiModel }
        }

        RowLayout {
            Layout.fillWidth: true
            Layout.margins: 8

            id: replyItem

            visible: false

            spacing: 8

            Control {
                Layout.alignment: Qt.AlignTop

                padding: 4

                contentItem: RowLayout {
                    Kirigami.Avatar {
                        Layout.preferredWidth: Kirigami.Units.gridUnit
                        Layout.preferredHeight: Kirigami.Units.gridUnit

                        source: replyUser ? "image://mxc/" + replyUser.avatarMediaId: ""
                        name: replyUser ? replyUser.displayName : "No name"
                    }

                    Label {
                        Layout.alignment: Qt.AlignVCenter
                        text: replyUser ? replyUser.displayName : "No name"
                        rightPadding: 8
                    }
                }
            }

            TextEdit {
                Layout.fillWidth: true

                text: "<style>a{color: " + color + ";} .user-pill{}</style>" + replyContent

                selectByMouse: true
                readOnly: true
                wrapMode: Label.Wrap
                selectedTextColor: "white"
                textFormat: Text.RichText
            }
        }

        ListView {
            Layout.fillWidth: true
            Layout.preferredHeight: 36
            Layout.margins: 8

            id: autoCompleteListView

            visible: false

            model: autoCompleteModel

            clip: true
            spacing: 4
            orientation: ListView.Horizontal
            highlightFollowsCurrentItem: true
            keyNavigationWraps: true

            delegate: Control {
                property string autoCompleteText: modelData.displayName ?? modelData.unicode
                property bool isEmoji: modelData.unicode != null
                readonly property bool highlighted: autoCompleteListView.currentIndex == index

                height: 36
                padding: 6

                background: Rectangle {
                    visible: !isEmoji
                    color: highlighted ? border.color : "transparent"
                    border.color: isEmoji ? MPalette.accent : modelData.color
                    border.width: 2
                    radius: height / 2
                }

                contentItem: RowLayout {
                    spacing: Kirigami.Units.largeSpacing

                    Label {
                        width: Kirigami.Units.gridUnit
                        height: Kirigami.Units.gridUnit
                        visible: isEmoji
                        text: autoCompleteText
                        font.family: "Emoji"
                        verticalAlignment: Text.AlignVCenter
                        horizontalAlignment: Text.AlignHCenter
                    }

                    Kirigami.Avatar {
                        Layout.preferredWidth: Kirigami.Units.gridUnit
                        Layout.preferredHeight: Kirigami.Units.gridUnit
                        
                        source: modelData.avatarMediaId ? "image://mxc/" + modelData.avatarMediaId : ""
                        color: modelData.color ? Qt.darker(modelData.color, 1.1) : null
                    }
                    Label {
                        Layout.fillHeight: true

                        visible: !isEmoji
                        text: autoCompleteText
                        color: highlighted ? Kirigami.Theme.highlightTextColor : Kirigami.Theme.textColor
                        verticalAlignment: Text.AlignVCenter
                        rightPadding: Kirigami.Units.largeSpacing
                    }
                }

                MouseArea {
                    anchors.fill: parent
                    onClicked: {
                        autoCompleteListView.currentIndex = index
                        inputField.replaceAutoComplete(autoCompleteText)
                    }
                }
            }
        }

        Kirigami.Separator {
            Layout.fillWidth: true
            Layout.preferredHeight: 1
            visible: emojiPicker.visible || replyItem.visible || autoCompleteListView.visible
        }

        RowLayout {
            Layout.fillWidth: true

            spacing: 0

            ToolButton {
                id: uploadButton

                Layout.preferredWidth: 48
                Layout.preferredHeight: 48
                Layout.alignment: Qt.AlignBottom

                visible: !isReply && !hasAttachment

                icon.name: "mail-attachment"

                onClicked: {
                    if (Clipboard.hasImage) {
                        attachDialog.open()
                    } else {
                        var fileDialog = openFileDialog.createObject(ApplicationWindow.overlay)

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

                            root.attach(path)
                        })

                        fileDialog.open()
                    }
                }

                BusyIndicator {
                    anchors.fill: parent

                    running: currentRoom && currentRoom.hasFileUploading
                }
            }

            ToolButton {
                Layout.preferredWidth: 48
                Layout.preferredHeight: 48
                Layout.alignment: Qt.AlignBottom

                id: cancelReplyButton

                visible: isReply

                icon.name: "dialog-cancel"

                onClicked: clearReply()
            }

            Control {
                Layout.margins: 6
                Layout.preferredHeight: 36
                Layout.alignment: Qt.AlignVCenter

                visible: hasAttachment

                rightPadding: 8

                contentItem: RowLayout {
                    spacing: 0

                    ToolButton {
                        Layout.preferredWidth: height
                        Layout.fillHeight: true

                        id: cancelAttachmentButton

                        icon.name: "dialog-cancel"

                        onClicked: {
                            hasAttachment = false;
                            attachmentPath = "";
                        }
                    }

                    Label {
                        Layout.alignment: Qt.AlignVCenter

                        text: attachmentPath !== "" ? attachmentPath.toString().substring(attachmentPath.toString().lastIndexOf('/') + 1, attachmentPath.length) : ""
                    }
                }
            }

            TextArea {
                property real progress: 0

                Layout.fillWidth: true
                Layout.minimumHeight: 48

                id: inputField

                wrapMode: Text.Wrap
                placeholderText: "Send a Message"
                topPadding: 0
                bottomPadding: 0
                selectByMouse: true
                verticalAlignment: TextEdit.AlignVCenter

                text: currentRoom != null ? currentRoom.cachedInput : ""

                background: Item {}

                Rectangle {
                    width: currentRoom && currentRoom.hasFileUploading ? parent.width * currentRoom.fileUploadingProgress / 100 : 0
                    height: parent.height

                    opacity: 0.2
                }

                Timer {
                    id: timeoutTimer

                    repeat: false
                    interval: 2000
                    onTriggered: {
                        repeatTimer.stop()
                        currentRoom.sendTypingNotification(false)
                    }
                }

                Timer {
                    id: repeatTimer

                    repeat: true
                    interval: 5000
                    triggeredOnStart: true
                    onTriggered: currentRoom.sendTypingNotification(true)
                }

                Keys.onReturnPressed: {
                    if (event.modifiers & Qt.ShiftModifier) {
                        insert(cursorPosition, "\n")
                    } else {
                        postMessage(text)
                        text = ""
                        clearReply()
                        closeAll()
                    }
                }

                Keys.onEscapePressed: closeAll()

                Keys.onBacktabPressed: if (isAutoCompleting) autoCompleteListView.decrementCurrentIndex()

                Keys.onTabPressed: {
                    if (isAutoCompleting) {
                        autoCompleteListView.incrementCurrentIndex()
                    } else {
                        autoCompleteBeginPosition = text.substring(0, cursorPosition).lastIndexOf(" ") + 1
                        var autoCompletePrefix = text.substring(0, cursorPosition).split(" ").pop()
                        if (!autoCompletePrefix) return
                        if (autoCompletePrefix.startsWith(":")) {
                            autoCompleteBeginPosition = text.substring(0, cursorPosition).lastIndexOf(" ") + 1
                            autoCompleteModel = emojiModel.filterModel(autoCompletePrefix)
                            if (autoCompleteModel.length === 0) return
                            isAutoCompleting = true
                            autoCompleteEndPosition = cursorPosition
                        } else {
                            autoCompleteModel = currentRoom.getUsers(autoCompletePrefix)
                            if (autoCompleteModel.length === 0) return
                            isAutoCompleting = true
                            autoCompleteEndPosition = cursorPosition
                        }
                    }
                    replaceAutoComplete(autoCompleteListView.currentItem.autoCompleteText)
                }

                onTextChanged: {
                    timeoutTimer.restart()
                    repeatTimer.start()
                    currentRoom.cachedInput = text

                    if (cursorPosition !== autoCompleteBeginPosition && cursorPosition !== autoCompleteEndPosition) {
                        isAutoCompleting = false
                        autoCompleteListView.currentIndex = 0
                    }
                }

                function replaceAutoComplete(word) {
                    remove(autoCompleteBeginPosition, autoCompleteEndPosition)
                    autoCompleteEndPosition = autoCompleteBeginPosition + word.length
                    insert(cursorPosition, word)
                }

                function postMessage(text) {
                    if(!currentRoom) { return }

                    if (hasAttachment) {
                        currentRoom.uploadFile(attachmentPath, text)
                        clearAttachment()
                        return
                    }

                    if (text.trim().length === 0) { return }

                    var PREFIX_ME = '/me '
                    var PREFIX_NOTICE = '/notice '
                    var PREFIX_RAINBOW = '/rainbow '

                    var messageEventType = RoomMessageEvent.Text

                    if (text.indexOf(PREFIX_RAINBOW) === 0) {
                        text = text.substr(PREFIX_RAINBOW.length)

                        var parsedText = ""
                        var rainbowColor = ["#ff2b00", "#ff5500", "#ff8000", "#ffaa00", "#ffd500", "#ffff00", "#d4ff00", "#aaff00", "#80ff00", "#55ff00", "#2bff00", "#00ff00", "#00ff2b", "#00ff55", "#00ff80", "#00ffaa", "#00ffd5", "#00ffff", "#00d4ff", "#00aaff", "#007fff", "#0055ff", "#002bff", "#0000ff", "#2a00ff", "#5500ff", "#7f00ff", "#aa00ff", "#d400ff", "#ff00ff", "#ff00d4", "#ff00aa", "#ff0080", "#ff0055", "#ff002b", "#ff0000"]
                        for (var i = 0; i < text.length; i++) {
                            parsedText = parsedText + "<font color='" + rainbowColor[i % rainbowColor.length] + "'>" + text.charAt(i) + "</font>"
                        }
                        currentRoom.postHtmlMessage(text, parsedText, RoomMessageEvent.Text, replyEventID)
                        return
                    }

                    if (text.indexOf(PREFIX_ME) === 0) {
                        text = text.substr(PREFIX_ME.length)
                        messageEventType = RoomMessageEvent.Emote
                    } else if (text.indexOf(PREFIX_NOTICE) === 0) {
                        text = text.substr(PREFIX_NOTICE.length)
                        messageEventType = RoomMessageEvent.Notice
                    }

                    console.log(replyContent, replyUser, replyEventID, messageEventType);
                    currentRoom.postArbitaryMessage(text, messageEventType, replyEventID)
                }
            }

            ToolButton {
                Layout.preferredWidth: 48
                Layout.preferredHeight: 48
                Layout.alignment: Qt.AlignBottom

                id: emojiButton
                icon.name: "preferences-desktop-emoticons"
                icon.color: "transparent"

                onClicked: emojiPicker.visible = !emojiPicker.visible
            }
            ToolButton {
                Layout.preferredWidth: 48
                Layout.preferredHeight: 48
                Layout.alignment: Qt.AlignBottom

                icon.name: "document-send"
                icon.color: "transparent"

                onClicked: {
                    inputField.postMessage(inputField.text)
                    inputField.text = ""
                    root.clearReply()
                    root.closeAll()
                }
            }
        }
    }

    function insert(str) {
        inputField.insert(inputField.cursorPosition, str)
    }

    function clear() {
        inputField.clear()
    }

    function clearReply() {
        isReply = false
        replyUser = null;
        replyContent = "";
        replyEventID = ""
    }

    function focus() {
        inputField.forceActiveFocus()
    }

    function closeAll() {
        replyItem.visible = false
        autoCompleteListView.visible = false
        emojiPicker.visible = false
    }

    function attach(localPath) {
        hasAttachment = true
        attachmentPath = localPath
    }

    function clearAttachment() {
        hasAttachment = false
        attachmentPath = ""
    }
}