import QtQuick 2.15
import QtQuick.Layouts 1.15

import StatusQ 0.1
import StatusQ.Components 0.1
import StatusQ.Controls 0.1
import StatusQ.Core 0.1
import StatusQ.Core.Theme 0.1
import StatusQ.Core.Utils 0.1
import StatusQ.Popups 0.1

import AppLayouts.Communities.controls 1.0
import shared.controls 1.0

import SortFilterProxyModel 0.2

StatusDropdown {
    id: root

    width: 289
    padding: 8

    // force keeping within the bounds of the enclosing window
    margins: 0

    property bool allowChoosingEntireCommunity: false
    property bool showAddChannelButton: false

    property string communityName
    property string communityImage
    property string communityColor

    property var model

    property int acceptMode: InDropdown.AcceptMode.Add

    enum AcceptMode {
        Add, Update
    }

    signal addChannelClicked
    signal communitySelected
    signal channelsSelected(var channels)

    function setSelectedChannels(channels) {
        d.selectedChannels.clear()
        channels.forEach(c => d.selectedChannels.add(c))
        d.selectedChannelsChanged()
    }

    onAboutToHide: {
        searcher.text = ""
        listView.positionViewAtBeginning()
    }

    onAboutToShow: listView.Layout.preferredHeight = Math.min(
                       listView.implicitHeight, 420)

    // only channels (no entries representing categories), sorted according to
    // category position and position
    SortFilterProxyModel {
        id: onlyChannelsModel

        sourceModel: root.model

        filters: ValueFilter {
            roleName: "isCategory"
            value: false
        }

        sorters: [
            RoleSorter {
                roleName: "categoryPosition"
                priority: 2 // Higher number -> higher priority
            },
            RoleSorter {
                roleName: "position"
                priority: 1
            }
        ]
    }

    // only items representing categories
    SortFilterProxyModel {
        id: categoriesModel

        sourceModel: root.model

        filters: ValueFilter {
            roleName: "isCategory"
            value: true
        }
    }

    // categories, name role renamed to categoryName
    RolesRenamingModel {
        id: categoriesModelRenamed

        sourceModel: categoriesModel

        mapping: RoleRename {
            from: "name"
            to: "categoryName"
        }
    }

    // categories joined to channels model in order to provide channelName,
    // in order to be used in section.property.
    LeftJoinModel {
        id: joined

        leftModel: onlyChannelsModel
        rightModel: categoriesModelRenamed

        joinRole: "categoryId"
        rolesToJoin: "categoryName"
    }

    // final filtering based on user's input in search bar
    SortFilterProxyModel {
        id: filtered

        sourceModel: joined

        filters: RegExpFilter {
            roleName: "name"
            pattern: `*${searcher.text}*`
            caseSensitivity : Qt.CaseInsensitive
            syntax: RegExpFilter.Wildcard
        }
    }

    QtObject {
        id: d

        readonly property int defaultVMargin: 9
        readonly property int maxHeightCountNo: 5
        readonly property int itemStandardHeight: 44
        readonly property var selectedChannels: new Set()

        function resolveEmoji(emoji) {
            return !!emoji ? emoji : ""
        }

        function resolveColor(color, colorId) {
            return !!color ? color : Theme.palette.userCustomizationColors[colorId]
        }
    }

   contentItem: ColumnLayout {
        spacing: 0

        SearchBox {
            id: searcher

            Layout.fillWidth: true

            topPadding: 0
            bottomPadding: 0
            minimumHeight: 36
            maximumHeight: 36
        }

        StatusListItem {
            Layout.fillWidth: true
            Layout.topMargin: d.defaultVMargin
            Layout.preferredHeight: d.itemStandardHeight

            visible: root.allowChoosingEntireCommunity
            title: root.communityName
            subTitle: qsTr("Community")

            asset.name:  root.communityImage
            asset.color: root.communityColor
            asset.isImage: true
            asset.width: 32
            asset.height: 32
            asset.isLetterIdenticon: !asset.name
            asset.charactersLen: 2
            asset.letterSize: 15

            leftPadding: 8
            rightPadding: 6

            statusListItemTitleArea.anchors.leftMargin: 8
            statusListItemTitle.font.pixelSize: 13
            statusListItemTitle.font.weight: Font.Medium

            statusListItemSubTitle.font.pixelSize: 12

            components: [
                StatusRadioButton {
                    id: radioButton

                    size: StatusRadioButton.Size.Small
                    rightPadding: 0
                }
            ]

            // using MouseArea instead of build-in 'clicked' signal to avoid
            // intercepting event by the StatusRadioButton
            MouseArea {
                anchors.fill: parent
                onClicked: {
                    radioButton.toggle()
                    radioButton.toggled()
                }
                cursorShape: Qt.PointingHandCursor
            }
        }

        StatusMenuSeparator {
            Layout.fillWidth: true
            Layout.topMargin: 4 - implicitHeight / 2
            Layout.bottomMargin: 4 - implicitHeight / 2

            visible: root.allowChoosingEntireCommunity
        }

        StatusListView {
            id: listView

            model: filtered

            Layout.fillWidth: true
            Layout.minimumHeight: Math.min(d.maxHeightCountNo * d.itemStandardHeight,
                                           contentHeight)
            Layout.maximumHeight: Layout.minimumHeight
            Layout.bottomMargin: d.defaultVMargin
            Layout.topMargin: !root.allowChoosingEntireCommunity
                              && !root.allowChoosingEntireCommunity ? d.defaultVMargin : 0

            Component {
                id: addChannelButtonComponent

                StatusIconTextButton {
                    height: 36
                    leftPadding: 8
                    spacing: 8
                    statusIcon: "add"
                    icon.width: 16
                    icon.height: 16
                    iconRotation: 0
                    text: qsTr("Add channel")
                    onClicked: root.addChannelClicked()
                }
            }

            header: root.showAddChannelButton ? addChannelButtonComponent : null

            section.delegate: CategoryListItem {
                title: section

                width: ListView.view.width

                MouseArea {
                    anchors.fill: parent

                    onClicked: {
                        const categoryId = ModelUtils.getByKey(
                                             categoriesModel, "name", section, "categoryId")
                        const allKeys = ModelUtils.modelToArray(
                                          filtered, ["itemId", "categoryId"])
                        const inCategoryKeys = allKeys.filter(
                                                 e => e.categoryId === categoryId)
                        const allSelected = inCategoryKeys.every(
                                              e => d.selectedChannels.has(e.itemId))

                        if (allSelected)
                            inCategoryKeys.forEach(
                                        e => d.selectedChannels.delete(e.itemId))
                        else
                            inCategoryKeys.forEach(
                                        e => d.selectedChannels.add(e.itemId))

                        d.selectedChannelsChanged()
                    }
                }
            }

            section.property: "categoryName"

            delegate: CommunityListItem {
                id: communitySubItem

                objectName: "communityListItem_" + model.name

                width: ListView.view.width
                visible: show

                title: "#" + model.name

                asset.name: model.icon ?? ""
                asset.emoji: d.resolveEmoji(model.emoji)
                asset.color: d.resolveColor(model.color, model.colorId)

                checked: d.selectedChannels.has(model.itemId)

                checkBox.onToggled: {
                    if (checked)
                        d.selectedChannels.add(model.itemId)
                    else
                        d.selectedChannels.delete(model.itemId)

                    d.selectedChannelsChanged()
                }
            }
        }

        StatusButton {
            Layout.fillWidth: true

            enabled: root.acceptMode === InDropdown.AcceptMode.Update
                     || d.selectedChannels.size > 0

            text: {
                if (root.acceptMode === InDropdown.AcceptMode.Update)
                    return qsTr("Update")

                if (radioButton.checked)
                    return qsTr("Add community")

                if (d.selectedChannels.size === 0)
                    return qsTr("Add")

                return qsTr("Add %n channel(s)", "", d.selectedChannels.size)
            }


            onClicked: {
                if (radioButton.checked) {
                    root.communitySelected()
                    return
                }

                root.channelsSelected(Array.from(d.selectedChannels.values()))
            }
        }
    }
}