import QtQuick 2.15
import QtQuick.Controls 2.15

import AppLayouts.Communities.controls 1.0
import AppLayouts.Communities.layouts 1.0
import AppLayouts.Communities.views 1.0

import StatusQ 0.1
import StatusQ.Controls 0.1
import StatusQ.Core 0.1
import StatusQ.Core.Utils 0.1

import utils 1.0
import shared.popups 1.0

import SortFilterProxyModel 0.2

StackView {
    id: root

    required property var permissionsModel
    required property var assetsModel
    required property var collectiblesModel
    required property var channelsModel
    property bool showChannelSelector: true
    property alias initialPage: initialItem

    // id, name, image, color, owner properties expected
    required property var communityDetails

    property int viewWidth: 560 // by design
    property string previousPageName: depth > 1 ? qsTr("Permissions") : ""

    signal createPermissionRequested(int permissionType, var holdings,
                                     var channels, bool isPrivate)
    signal updatePermissionRequested(string key, int permissionType,
                                     var holdings, var channels, bool isPrivate)
    signal removePermissionRequested(string key)
    signal navigateToMintTokenSettings(bool isAssetType)

    function navigateBack() {
        if (depth === 2 && currentItem.toast.active)
            currentItem.toast.notifyDirty()
        else
            pop(StackView.Immediate)
    }

    function pushEditView(properties) {
        root.push(newPermissionView, properties, StackView.Immediate);
    }

    SortFilterProxyModel {
        id: allChannelsTransformed

        sourceModel: root.channelsModel

        proxyRoles: [
            FastExpressionRole {
                name: "key"
                expression: model.itemId ?? ""
                expectedRoles: ["itemId"]
            },
            FastExpressionRole {
                name: "text"
                expression: "#" + model.name
                expectedRoles: ["name"]
            },
            FastExpressionRole {
                name: "imageSource"
                expression: model.icon
                expectedRoles: ["icon"]
            },
            FastExpressionRole {
                name: "operator"

                // Direct call for singleton enum is not handled properly by SortFilterProxyModel.
                readonly property int none: OperatorsUtils.Operators.None

                expression: none
                expectedRoles: []
            }
        ]
    }


    // Community Permissions possible view contents:
    initialItem: SettingsPage {
        id: initialItem
        implicitWidth: 0

        title: qsTr("Permissions")

        buttons: StatusButton {
            objectName: "addNewItemButton"

            text: qsTr("Add new permission")

            onClicked: root.push(newPermissionView, StackView.Immediate)
        }

        contentItem: StatusScrollView {
            contentHeight: (permissionsView.height + topPadding)
            topPadding: permissionsView.topPadding
            padding: 0
            PermissionsView {
                id: permissionsView
                permissionsModel: root.permissionsModel
                assetsModel: root.assetsModel
                collectiblesModel: root.collectiblesModel
                channelsModel: allChannelsTransformed

                communityDetails: root.communityDetails

                viewWidth: root.viewWidth

                onEditPermissionRequested: {
                    const item = ModelUtils.get(root.permissionsModel, index)

                    const properties = {
                        permissionKeyToEdit: item.key,
                        holdingsToEditModel: item.holdingsListModel,
                        channelsToEditModel: item.channelsListModel,
                        permissionTypeToEdit: item.permissionType,
                        isPrivateToEditValue: item.isPrivate
                    }

                    root.pushEditView(properties);
                }

                onDuplicatePermissionRequested: {
                    const item = ModelUtils.get(root.permissionsModel, index)

                    const properties = {
                        holdingsToEditModel: item.holdingsListModel,
                        channelsToEditModel: item.channelsListModel,
                        permissionTypeToEdit: item.permissionType,
                        isPrivateToEditValue: item.isPrivate
                    }

                    root.pushEditView(properties);
                }

                onRemovePermissionRequested: {
                    const key = ModelUtils.get(root.permissionsModel, index, "key")
                    root.removePermissionRequested(key)
                }
            }
        }
    }

    Component {
        id: newPermissionView

        SettingsPage {
            id: newPermissionViewPage
            implicitWidth: 0
            title: isEditState ? qsTr("Edit permission") : qsTr("New permission")

            property alias isSaveEnabled: editPermissionView.saveEnabled
            property alias isPrivateToEditValue: editPermissionView.isPrivate
            property alias permissionTypeToEdit: editPermissionView.permissionType
            property alias holdingsToEditModel: editPermissionView.selectedHoldingsModel
            property alias channelsToEditModel: editPermissionView.selectedChannelsModel

            property bool holdingsRequired: editPermissionView.dirtyValues.holdingsRequired

            property string permissionKeyToEdit
            readonly property bool isEditState: !!permissionKeyToEdit

            readonly property alias toast: settingsDirtyToastMessage

            function resetChanges() {
                editPermissionView.resetChanges();
            }
            function updatePermission() {
                editPermissionView.saveChanges();
            }
            function createPermission() {
                editPermissionView.createPermissionClicked();
            }

            contentItem: EditPermissionView {
                id: editPermissionView

                viewWidth: root.viewWidth

                SortFilterProxyModel {
                    id: nonOwnerCollectibles
                    sourceModel: root.collectiblesModel
                    filters: [
                        ValueFilter {
                            roleName: "privilegesLevel"
                            value: Constants.TokenPrivilegesLevel.Owner
                            inverted: true
                        }
                    ]
                }

                assetsModel: root.assetsModel
                collectiblesModel: nonOwnerCollectibles
                channelsModel: allChannelsTransformed
                communityDetails: root.communityDetails
                showChannelSelector: root.showChannelSelector
                isEditState: newPermissionViewPage.isEditState
                holdingsRequired: selectedHoldingsModel
                                  ? selectedHoldingsModel.count > 0 : false

                permissionDuplicated: {
                    // dependencies
                    holdingsTracker.revision
                    channelsTracker.revision
                    editPermissionView.dirtyValues.permissionType
                    editPermissionView.dirtyValues.isPrivate
                    const model = root.permissionsModel
                    const count = model.rowCount()

                    for (let i = 0; i < count; i++) {
                        const item = ModelUtils.get(model, i)

                        if (newPermissionViewPage.permissionKeyToEdit === item.key)
                            continue

                        const holdings = item.holdingsListModel
                        const channels = item.channelsListModel
                        const permissionType = item.permissionType

                        const same = (a, b) => ModelUtils.checkEqualitySet(a, b, ["key"])

                        if (holdings.rowCount() === 0)
                            if (dirtyValues.holdingsRequired)
                                continue
                            else
                                return true

                        if (holdings.rowCount() !== 0 && !dirtyValues.holdingsRequired)
                            continue

                        const channelsModel = showChannelSelector ?
                                              dirtyValues.selectedChannelsModel :
                                              selectedChannelsModel

                        if (same(dirtyValues.selectedHoldingsModel, holdings)
                                && same(channelsModel, channels)
                                && dirtyValues.permissionType === permissionType)
                            return true
                    }

                    return false
                }

                readonly property var permissionTypeLimitReachedOrExceeded: {
                    const type = dirtyValues.permissionType
                    const limit = PermissionTypes.getPermissionsCountLimit(type)

                    if (limit === -1)
                        return [false, false]

                    const model = root.permissionsModel
                    const count = model.rowCount()
                    let sameTypeCount = 0

                    for (let i = 0; i < count; i++)
                        if (type === ModelUtils.get(model, i, "permissionType"))
                            sameTypeCount++

                    return [sameTypeCount >= limit, sameTypeCount > limit]
                }

                permissionTypeLimitReached: permissionTypeLimitReachedOrExceeded[0]
                permissionTypeLimitExceeded: permissionTypeLimitReachedOrExceeded[1]

                onCreatePermissionClicked: {
                    const holdings = dirtyValues.holdingsRequired ?
                                       ModelUtils.modelToArray(
                                           dirtyValues.selectedHoldingsModel,
                                           ["key", "type", "amount"]) : []

                    const channels = root.showChannelSelector ?
                                   ModelUtils.modelToArray(
                                       dirtyValues.selectedChannelsModel, ["key"]) :
                                   ModelUtils.modelToArray(selectedChannelsModel, ["key"])

                    root.createPermissionRequested(
                                dirtyValues.permissionType, holdings, channels,
                                dirtyValues.isPrivate)

                    if (root.showChannelSelector) {
                        root.pop(StackView.Immediate)
                    }
                }

                onNavigateToMintTokenSettings: root.navigateToMintTokenSettings(isAssetType)

                function saveChanges() {
                    const holdings = dirtyValues.holdingsRequired ?
                                       ModelUtils.modelToArray(
                                           dirtyValues.selectedHoldingsModel,
                                           ["key", "type", "amount"])
                                     : []

                    const channels = ModelUtils.modelToArray(
                                       dirtyValues.selectedChannelsModel, ["key"])

                    root.updatePermissionRequested(
                                newPermissionViewPage.permissionKeyToEdit,
                                dirtyValues.permissionType, holdings, channels,
                                dirtyValues.isPrivate)
                }

                ModelChangeTracker {
                    id: holdingsTracker

                    model: editPermissionView.dirtyValues.selectedHoldingsModel
                }

                ModelChangeTracker {
                    id: channelsTracker

                    model: editPermissionView.dirtyValues.selectedChannelsModel
                }
            }

            SettingsDirtyToastMessage {
                id: settingsDirtyToastMessage

                z: 1
                anchors {
                    bottom: parent.bottom
                    horizontalCenter: parent.horizontalCenter
                    bottomMargin: 16
                }

                saveChangesText: qsTr("Update permission")
                cancelChangesText: qsTr("Revert changes")

                saveChangesButtonEnabled: editPermissionView.saveEnabled

                onSaveChangesClicked: {
                    editPermissionView.saveChanges()
                    root.pop(StackView.Immediate)
                }

                onResetChangesClicked: editPermissionView.resetChanges()

                Component.onCompleted: {
                    // delay to avoid toast blinking on entry
                    settingsDirtyToastMessage.active = Qt.binding(
                                     () => editPermissionView.isEditState &&
                                           editPermissionView.dirty &&
                                           root.showChannelSelector)
                }
            }
        }
    }
}