import Combine from "./Base/Combine"
import { FixedUiElement } from "./Base/FixedUiElement"
import BaseUIElement from "./BaseUIElement"
import { default as FeatureTitle } from "./Popup/Title.svelte"
import { RenderingSpecification, SpecialVisualization, SpecialVisualizationState } from "./SpecialVisualization"
import { HistogramViz } from "./Popup/HistogramViz"
import { UploadToOsmViz } from "./Popup/UploadToOsmViz"
import { MultiApplyViz } from "./Popup/MultiApplyViz"
import { PlantNetDetectionViz } from "./Popup/PlantNetDetectionViz"
import TagApplyButton from "./Popup/TagApplyButton"
import { MapillaryLinkVis } from "./Popup/MapillaryLinkVis"
import { ImmutableStore, Store, Stores, UIEventSource } from "../Logic/UIEventSource"
import AllTagsPanel from "./Popup/AllTagsPanel.svelte"
import { VariableUiElement } from "./Base/VariableUIElement"
import { Utils } from "../Utils"
import Wikidata, { WikidataResponse } from "../Logic/Web/Wikidata"
import { Translation } from "./i18n/Translation"
import Translations from "./i18n/Translations"
import OpeningHoursVisualization from "./OpeningHours/OpeningHoursVisualization"
import { SubtleButton } from "./Base/SubtleButton"
import StatisticsPanel from "./BigComponents/StatisticsPanel"
import AutoApplyButton from "./Popup/AutoApplyButton"
import { LanguageElement } from "./Popup/LanguageElement/LanguageElement"
import SvelteUIElement from "./Base/SvelteUIElement"
import { BBoxFeatureSourceForLayer } from "../Logic/FeatureSource/Sources/TouchesBboxFeatureSource"
import { Feature, GeoJsonProperties, LineString } from "geojson"
import { GeoOperations } from "../Logic/GeoOperations"
import LayerConfig from "../Models/ThemeConfig/LayerConfig"
import TagRenderingConfig from "../Models/ThemeConfig/TagRenderingConfig"
import ExportFeatureButton from "./Popup/ExportFeatureButton.svelte"
import WikipediaPanel from "./Wikipedia/WikipediaPanel.svelte"
import TagRenderingEditable from "./Popup/TagRendering/TagRenderingEditable.svelte"
import { PointImportButtonViz } from "./Popup/ImportButtons/PointImportButtonViz"
import WayImportButtonViz from "./Popup/ImportButtons/WayImportButtonViz"
import ConflateImportButtonViz from "./Popup/ImportButtons/ConflateImportButtonViz"
import OpenIdEditor from "./BigComponents/OpenIdEditor.svelte"
import SendEmail from "./Popup/SendEmail.svelte"
import Constants from "../Models/Constants"
import Wikipedia from "../Logic/Web/Wikipedia"
import { TagUtils } from "../Logic/Tags/TagUtils"
import OpenJosm from "./Base/OpenJosm.svelte"
import NextChangeViz from "./OpeningHours/NextChangeViz.svelte"
import { Unit } from "../Models/Unit"
import DirectionIndicator from "./Base/DirectionIndicator.svelte"
import ComparisonTool from "./Comparison/ComparisonTool.svelte"
import SpecialTranslation from "./Popup/TagRendering/SpecialTranslation.svelte"
import SpecialVisualisationUtils from "./SpecialVisualisationUtils"
import Toggle from "./Input/Toggle"
import LinkedDataLoader from "../Logic/Web/LinkedDataLoader"
import DynLink from "./Base/DynLink.svelte"
import MarkdownUtils from "../Utils/MarkdownUtils"
import Trash from "@babeard/svelte-heroicons/mini/Trash"
import { And } from "../Logic/Tags/And"
import GroupedView from "./Popup/GroupedView.svelte"
import { QuestionableTagRenderingConfigJson } from "../Models/ThemeConfig/Json/QuestionableTagRenderingConfigJson"
import NoteCommentElement from "./Popup/Notes/NoteCommentElement.svelte"
import FediverseLink from "./Popup/FediverseLink.svelte"
import { ImageVisualisations } from "./SpecialVisualisations/ImageVisualisations"
import { NoteVisualisations } from "./SpecialVisualisations/NoteVisualisations"
import { FavouriteVisualisations } from "./SpecialVisualisations/FavouriteVisualisations"
import { UISpecialVisualisations } from "./SpecialVisualisations/UISpecialVisualisations"
import { SettingsVisualisations } from "./SpecialVisualisations/SettingsVisualisations"
import { ReviewSpecialVisualisations } from "./SpecialVisualisations/ReviewSpecialVisualisations"
import { MapRouletteSpecialVisualisations } from "./SpecialVisualisations/MapRouletteSpecialVisualisations"


class StealViz implements SpecialVisualization {
    // Class must be in SpecialVisualisations due to weird cyclical import that breaks the tests

    funcName = "steal"
    docs = "Shows a tagRendering from a different object as if this was the object itself"
    args = [
        {
            name: "featureId",
            doc: "The key of the attribute which contains the id of the feature from which to use the tags",
            required: true
        },
        {
            name: "tagRenderingId",
            doc: "The layer-id and tagRenderingId to render. Can be multiple value if ';'-separated (in which case every value must also contain the layerId, e.g. `layerId.tagRendering0; layerId.tagRendering1`). Note: this can cause layer injection",
            required: true
        }
    ]
    needsUrls = []
    svelteBased = true

    constr(state: SpecialVisualizationState, featureTags, args) {
        const [featureIdKey, layerAndtagRenderingIds] = args
        const tagRenderings: [LayerConfig, TagRenderingConfig][] = []
        for (const layerAndTagRenderingId of layerAndtagRenderingIds.split(";")) {
            const [layerId, tagRenderingId] = layerAndTagRenderingId.trim().split(".")
            const layer = state.theme.layers.find((l) => l.id === layerId)
            const tagRendering = layer.tagRenderings.find((tr) => tr.id === tagRenderingId)
            tagRenderings.push([layer, tagRendering])
        }
        if (tagRenderings.length === 0) {
            throw "Could not create stolen tagrenddering: tagRenderings not found"
        }
        return new VariableUiElement(
            featureTags.map(
                (tags) => {
                    const featureId = tags[featureIdKey]
                    if (featureId === undefined) {
                        return undefined
                    }
                    const otherTags = state.featureProperties.getStore(featureId)
                    const otherFeature = state.indexedFeatures.featuresById.data.get(featureId)
                    const elements: BaseUIElement[] = []
                    for (const [layer, tagRendering] of tagRenderings) {
                        elements.push(
                            new SvelteUIElement(TagRenderingEditable, {
                                config: tagRendering,
                                tags: otherTags,
                                selectedElement: otherFeature,
                                state,
                                layer
                            })
                        )
                    }
                    if (elements.length === 1) {
                        return elements[0]
                    }
                    return new Combine(elements).SetClass("flex flex-col")
                },
                [state.indexedFeatures.featuresById]
            )
        )
    }

    getLayerDependencies(args): string[] {
        const [, tagRenderingId] = args
        if (tagRenderingId.indexOf(".") < 0) {
            throw "Error: argument 'layerId.tagRenderingId' of special visualisation 'steal' should contain a dot"
        }
        const [layerId] = tagRenderingId.split(".")
        return [layerId]
    }
}


export default class SpecialVisualizations {
    public static specialVisualizations: SpecialVisualization[] = SpecialVisualizations.initList()
    public static specialVisualisationsDict: Map<string, SpecialVisualization> = new Map<
        string,
        SpecialVisualization
    >()

    static {
        for (const specialVisualization of SpecialVisualizations.specialVisualizations) {
            SpecialVisualizations.specialVisualisationsDict.set(
                specialVisualization.funcName,
                specialVisualization
            )
        }
    }

    public static DocumentationFor(viz: string | SpecialVisualization): string {
        if (typeof viz === "string") {
            viz = SpecialVisualizations.specialVisualizations.find((sv) => sv.funcName === viz)
        }
        if (viz === undefined) {
            return ""
        }
        const example =
            viz.example ??
            "`{" + viz.funcName + "(" + viz.args.map((arg) => arg.defaultValue).join(",") + ")}`"
        return [
            "### " + viz.funcName,
            viz.docs,
            viz.args.length > 0
                ? MarkdownUtils.table(
                    ["name", "default", "description"],
                    viz.args.map((arg) => {
                        let defaultArg = arg.defaultValue ?? "_undefined_"
                        if (defaultArg == "") {
                            defaultArg = "_empty string_"
                        }
                        return [arg.name, defaultArg, arg.doc]
                    })
                )
                : undefined,
            "#### Example usage of " + viz.funcName,
            "<code>" + example + "</code>"
        ].join("\n\n")
    }

    public static constructSpecification(
        template: string,
        extraMappings: SpecialVisualization[] = []
    ): RenderingSpecification[] {
        return SpecialVisualisationUtils.constructSpecification(
            template,
            SpecialVisualizations.specialVisualisationsDict,
            extraMappings
        )
    }

    public static HelpMessage(): string {

        const vis = [...SpecialVisualizations.specialVisualizations]
        vis.sort((a, b) => {
            return a.funcName < b.funcName ? -1 : 1
        })
        vis.sort((a, b) => {
            if (a.group === b.group) {
                return 0
            }
            return (a.group ?? "xxx") < (b.group ?? "xxx") ? -1 : 1
        })

        const groupExplanations: Record<string, string> = {
            "default": "These special visualisations are (mostly) interactive components that most elements get by default. You'll normally won't need them in custom layers. There are also a few miscellaneous elements supporting the map UI.",
            "favourites": "Elements relating to marking an object as favourite (giving it a heart). Default element",
            "settings": "Elements part of the usersettings-ui",
            "images": "Elements related to adding or manipulating images. Normally also added by default, but in some cases a tweaked version is needed",
            "notes": "Elements relating to OpenStreetMap-notes, e.g. the component to close and/or add a comment",
            "reviews": "Elements relating to seeing and adding ratings and reviews with Mangrove.reviews",
            "maproulette": "Elements to close a maproulette task"
        }

        const helpTexts: string[] = []
        let lastGroup: string = null
        for (const viz of vis) {
            if (viz.group !== lastGroup) {
                lastGroup = viz.group
                if (viz.group === undefined) {


                    helpTexts.push("## Unclassified elements\n\nVarious elements")
                } else {

                    helpTexts.push("## " + viz.group)
                    if (!groupExplanations[viz.group]) {
                        throw "\n\n >>>> ERROR <<<<  Unknown visualisation group type: " + viz.group + "\n\n\n"
                    }
                    helpTexts.push(groupExplanations[viz.group])
                }
            }
            helpTexts.push(SpecialVisualizations.DocumentationFor(viz))
        }

        const example = JSON.stringify(
            {
                render: {
                    special: {
                        type: "some_special_visualisation",
                        argname: "some_arg",
                        message: {
                            en: "some other really long message",
                            nl: "een boodschap in een andere taal"
                        },
                        other_arg_name: "more args"
                    },
                    before: {
                        en: "Some text to prefix before the special element (e.g. a title)",
                        nl: "Een tekst om voor het element te zetten (bv. een titel)"
                    },
                    after: {
                        en: "Some text to put after the element, e.g. a footer"
                    }
                }
            },
            null,
            "  "
        )

        const firstPart = [
            "# Special tag renderings",
            "In a tagrendering, some special values are substituted by an advanced UI-element. This allows advanced features and visualizations to be reused by custom themes or even to query third-party API's.",
            "General usage is `{func_name()}`, `{func_name(arg, someotherarg)}` or `{func_name(args):cssClasses}`. Note that you _do not_ need to use quotes around your arguments, the comma is enough to separate them. This also implies you cannot use a comma in your args",
            "#### Using expanded syntax",
            `Instead of using \`{"render": {"en": "{some_special_visualisation(some_arg, some other really long message, more args)} , "nl": "{some_special_visualisation(some_arg, een boodschap in een andere taal, more args)}}\`, one can also write`,
            "```\n" + example + "\n```\n",
            "In other words: use `{ \"before\": ..., \"after\": ..., \"special\": {\"type\": ..., \"argname\": ...argvalue...}`. The args are in the `special` block; an argvalue can be a string, a translation or another value. (Refer to class `RewriteSpecial` in case of problems)"
        ].join("\n\n")
        return firstPart + "\n\n" + helpTexts.join("\n\n")
    }

    private static initList(): SpecialVisualization[] {
        const specialVisualizations: SpecialVisualization[] = [
            ...ImageVisualisations.initList(),
            ...NoteVisualisations.initList(),
            ...FavouriteVisualisations.initList(),
            ...UISpecialVisualisations.initList(),
            ...SettingsVisualisations.initList(),
            ...ReviewSpecialVisualisations.initList(),
            ...MapRouletteSpecialVisualisations.initList(),

            new HistogramViz(),
            new StealViz(),


            {
                funcName: "export_as_gpx",
                docs: "Exports the selected feature as GPX-file",
                args: [],
                needsUrls: [],

                constr(
                    state: SpecialVisualizationState,
                    tags: UIEventSource<Record<string, string>>,
                    argument: string[],
                    feature: Feature,
                    layer: LayerConfig
                ) {
                    if (feature.geometry.type !== "LineString") {
                        return undefined
                    }
                    const t = Translations.t.general.download

                    return new SvelteUIElement(ExportFeatureButton, {
                        tags,
                        feature,
                        layer,
                        mimetype: "{gpx=application/gpx+xml}",
                        extension: "gpx",
                        construct: (feature: Feature<LineString>, title: string) =>
                            GeoOperations.toGpx(feature, title),
                        helpertext: t.downloadGpxHelper,
                        maintext: t.downloadFeatureAsGpx
                    })
                }
            },
            new UploadToOsmViz(),
            new MultiApplyViz(),

            new PlantNetDetectionViz(),

            new TagApplyButton(),

            new PointImportButtonViz(),
            new WayImportButtonViz(),
            new ConflateImportButtonViz(),

            {
                funcName: "wikipedia",
                docs: "A box showing the corresponding wikipedia article(s) - based on the **wikidata** tag.",
                args: [
                    {
                        name: "keyToShowWikipediaFor",
                        doc: "Use the wikidata entry from this key to show the wikipedia article for. Multiple keys can be given (separated by ';'), in which case the first matching value is used",
                        defaultValue: "wikidata;wikipedia"
                    }
                ],
                needsUrls: [...Wikidata.neededUrls, ...Wikipedia.neededUrls],

                example:
                    "`{wikipedia()}` is a basic example, `{wikipedia(name:etymology:wikidata)}` to show the wikipedia page of whom the feature was named after. Also remember that these can be styled, e.g. `{wikipedia():max-height: 10rem}` to limit the height",
                constr: (_, tagsSource, args) => {
                    const keys = args[0].split(";").map((k) => k.trim())
                    const wikiIds: Store<string[]> = tagsSource.map((tags) => {
                        const key = keys.find((k) => tags[k] !== undefined && tags[k] !== "")
                        return tags[key]?.split(";")?.map((id) => id.trim()) ?? []
                    })
                    return new SvelteUIElement(WikipediaPanel, {
                        wikiIds
                    })
                }
            },
            {
                funcName: "wikidata_label",
                docs: "Shows the label of the corresponding wikidata-item",
                args: [
                    {
                        name: "keyToShowWikidataFor",
                        doc: "Use the wikidata entry from this key to show the label",
                        defaultValue: "wikidata"
                    }
                ],
                needsUrls: Wikidata.neededUrls,
                example:
                    "`{wikidata_label()}` is a basic example, `{wikipedia(name:etymology:wikidata)}` to show the label itself",
                constr: (_, tagsSource, args) =>
                    new VariableUiElement(
                        tagsSource
                            .map((tags) => tags[args[0]])
                            .map((wikidata) => {
                                wikidata = Utils.NoEmpty(
                                    wikidata?.split(";")?.map((wd) => wd.trim()) ?? []
                                )[0]
                                const entry = Wikidata.LoadWikidataEntry(wikidata)
                                return new VariableUiElement(
                                    entry.map((e) => {
                                        if (e === undefined || e["success"] === undefined) {
                                            return wikidata
                                        }
                                        const response = <WikidataResponse>e["success"]
                                        return Translation.fromMap(response.labels)
                                    })
                                )
                            })
                    )
            },
            new MapillaryLinkVis(),
            new LanguageElement(),
            {
                funcName: "all_tags",
                docs: "Prints all key-value pairs of the object - used for debugging",
                args: [],
                constr: (
                    state,
                    tags: UIEventSource<Record<string, string>>,
                    _,
                    __,
                    layer: LayerConfig
                ) => new SvelteUIElement(AllTagsPanel, { tags, layer })
            },
            {
                funcName: "reviews",
                group: "reviews",

                example:
                    "`{reviews()}` for a vanilla review, `{reviews(name, play_forest)}` to review a play forest. If a name is known, the name will be used as identifier, otherwise 'play_forest' is used",
                docs: "A pragmatic combination of `create_review` and `list_reviews`",
                args: [
                    {
                        name: "subjectKey",
                        defaultValue: "name",
                        doc: "The key to use to determine the subject. If specified, the subject will be <b>tags[subjectKey]</b>"
                    },
                    {
                        name: "fallback",
                        doc: "The identifier to use, if <i>tags[subjectKey]</i> as specified above is not available. This is effectively a fallback value"
                    },
                    {
                        name: "question",
                        doc: "The question to ask in the review form. Optional"
                    }
                ],
                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    args: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    return new Combine([
                        SpecialVisualizations.specialVisualisationsDict
                            .get("create_review")
                            .constr(state, tagSource, args, feature, layer),
                        SpecialVisualizations.specialVisualisationsDict
                            .get("list_reviews")
                            .constr(state, tagSource, args, feature, layer)
                    ])
                }
            },


            {
                funcName: "opening_hours_table",
                docs: "Creates an opening-hours table. Usage: {opening_hours_table(opening_hours)} to create a table of the tag 'opening_hours'.",
                args: [
                    {
                        name: "key",
                        defaultValue: "opening_hours",
                        doc: "The tagkey from which the table is constructed."
                    },
                    {
                        name: "prefix",
                        defaultValue: "",
                        doc: "Remove this string from the start of the value before parsing. __Note: use `&LPARENs` to indicate `(` if needed__"
                    },
                    {
                        name: "postfix",
                        defaultValue: "",
                        doc: "Remove this string from the end of the value before parsing. __Note: use `&RPARENs` to indicate `)` if needed__"
                    }
                ],
                needsUrls: [Constants.countryCoderEndpoint],
                example:
                    "A normal opening hours table can be invoked with `{opening_hours_table()}`. A table for e.g. conditional access with opening hours can be `{opening_hours_table(access:conditional, no @ &LPARENS, &RPARENS)}`",
                constr: (state, tagSource: UIEventSource<any>, args) => {
                    const [key, prefix, postfix] = args
                    return new OpeningHoursVisualization(tagSource, key, prefix, postfix)
                }
            },
            {
                funcName: "opening_hours_state",
                docs: "A small element, showing if the POI is currently open and when the next change is",
                args: [
                    {
                        name: "key",
                        defaultValue: "opening_hours",
                        doc: "The tagkey from which the opening hours are read."
                    },
                    {
                        name: "prefix",
                        defaultValue: "",
                        doc: "Remove this string from the start of the value before parsing. __Note: use `&LPARENs` to indicate `(` if needed__"
                    },
                    {
                        name: "postfix",
                        defaultValue: "",
                        doc: "Remove this string from the end of the value before parsing. __Note: use `&RPARENs` to indicate `)` if needed__"
                    }
                ],
                constr(
                    state: SpecialVisualizationState,
                    tags: UIEventSource<Record<string, string>>,
                    args: string[]
                ): SvelteUIElement {
                    const keyToUse = args[0]
                    const prefix = args[1]
                    const postfix = args[2]
                    return new SvelteUIElement(NextChangeViz, {
                        state,
                        keyToUse,
                        tags,
                        prefix,
                        postfix
                    })
                }
            },
            {
                funcName: "canonical",

                docs: "Converts a short, canonical value into the long, translated text including the unit. This only works if a `unit` is defined for the corresponding value. The unit specification will be included in the text. ",
                example:
                    "If the object has `length=42`, then `{canonical(length)}` will be shown as **42 meter** (in english), **42 metre** (in french), ...",
                args: [
                    {
                        name: "key",
                        doc: "The key of the tag to give the canonical text for",
                        required: true
                    }
                ],
                constr: (state, tagSource, args) => {
                    const key = args[0]
                    return new VariableUiElement(
                        tagSource
                            .map((tags) => tags[key])
                            .map((value) => {
                                if (value === undefined) {
                                    return undefined
                                }
                                const allUnits: Unit[] = [].concat(
                                    ...(state?.theme?.layers?.map((lyr) => lyr.units) ?? [])
                                )
                                const unit = allUnits.filter((unit) =>
                                    unit.isApplicableToKey(key)
                                )[0]
                                if (unit === undefined) {
                                    return value
                                }
                                const getCountry = () => tagSource.data._country
                                return unit.asHumanLongValue(value, getCountry)
                            })
                    )
                }
            },
            {
                funcName: "export_as_geojson",
                docs: "Exports the selected feature as GeoJson-file",
                args: [],

                constr: (state, tags, args, feature, layer) => {
                    const t = Translations.t.general.download
                    return new SvelteUIElement(ExportFeatureButton, {
                        tags,
                        feature,
                        layer,
                        mimetype: "application/vnd.geo+json",
                        extension: "geojson",
                        construct: (feature: Feature<LineString>) =>
                            JSON.stringify(feature, null, "  "),
                        maintext: t.downloadFeatureAsGeojson,
                        helpertext: t.downloadGeoJsonHelper
                    })
                }
            },
            {
                funcName: "open_in_iD",
                docs: "Opens the current view in the iD-editor",
                args: [],

                constr: (state, feature) => {
                    return new SvelteUIElement(OpenIdEditor, {
                        mapProperties: state.mapProperties,
                        objectId: feature.data.id
                    })
                }
            },
            {
                funcName: "open_in_josm",
                docs: "Opens the current view in the JOSM-editor",
                args: [],
                needsUrls: ["http://127.0.0.1:8111/load_and_zoom"],

                constr: (state) => {
                    return new SvelteUIElement(OpenJosm, { state })
                }
            },
            {
                funcName: "clear_location_history",
                docs: "A button to remove the travelled track information from the device",
                args: [],

                constr: (state) => {
                    return new SubtleButton(
                        new SvelteUIElement(Trash),
                        Translations.t.general.removeLocationHistory
                    ).onClick(() => {
                        state.historicalUserLocations.features.setData([])
                        state.selectedElement.setData(undefined)
                    })
                }
            },
            {
                funcName: "visualize_note_comments",
                docs: "Visualises the comments for notes",
                args: [
                    {
                        name: "commentsKey",
                        doc: "The property name of the comments, which should be stringified json",
                        defaultValue: "comments"
                    },
                    {
                        name: "start",
                        doc: "Drop the first 'start' comments",
                        defaultValue: "0"
                    }
                ],
                needsUrls: [Constants.osmAuthConfig.url],
                constr: (state, tags, args) =>
                    new VariableUiElement(
                        tags
                            .map((tags) => tags[args[0]])
                            .map((commentsStr) => {
                                const comments: { text: string }[] = JSON.parse(commentsStr)
                                const startLoc = Number(args[1] ?? 0)
                                if (!isNaN(startLoc) && startLoc > 0) {
                                    comments.splice(0, startLoc)
                                }
                                return new Combine(
                                    comments
                                        .filter((c) => c.text !== "")
                                        .map(
                                            (comment) =>
                                                new SvelteUIElement(NoteCommentElement, {
                                                    comment,
                                                    state
                                                })
                                        )
                                ).SetClass("flex flex-col")
                            })
                    )
            },
            {
                funcName: "title",
                args: [],

                docs: "Shows the title of the popup. Useful for some cases, e.g. 'What is phone number of {title()}?'",
                example:
                    "`What is the phone number of {title()}`, which might automatically become `What is the phone number of XYZ`.",
                constr: (
                    state: SpecialVisualizationState,
                    tags: UIEventSource<Record<string, string>>,
                    _: string[],
                    feature: Feature,
                    layer: LayerConfig
                ) => {
                    return new SvelteUIElement(FeatureTitle, { state, tags, feature, layer })
                }
            },
            {
                funcName: "statistics",
                docs: "Show general statistics about the elements currently in view. Intended to use on the `current_view`-layer",
                args: [],

                constr: (state) => {
                    return new Combine(
                        state.theme.layers
                            .filter(
                                (l) =>
                                    l.name !== null &&
                                    l.title &&
                                    state.perLayer.get(l.id) !== undefined
                            )
                            .map(
                                (l) => {
                                    const fs = state.perLayer.get(l.id)
                                    console.log(">>>", l.id, fs)
                                    const bbox = state.mapProperties.bounds
                                    const fsBboxed = new BBoxFeatureSourceForLayer(fs, bbox)
                                    return new StatisticsPanel(fsBboxed)
                                },
                                [state.mapProperties.bounds]
                            )
                    )
                }
            },
            {
                funcName: "send_email",
                docs: "Creates a `mailto`-link where some fields are already set and correctly escaped. The user will be promted to send the email",
                args: [
                    {
                        name: "to",
                        doc: "Who to send the email to?",
                        required: true
                    },
                    {
                        name: "subject",
                        doc: "The subject of the email",
                        required: true
                    },
                    {
                        name: "body",
                        doc: "The text in the email",
                        required: true
                    },

                    {
                        name: "button_text",
                        doc: "The text shown on the button in the UI",
                        required: true
                    }
                ],

                constr(__, tags, args) {
                    return new SvelteUIElement(SendEmail, { args, tags })
                }
            },
            {
                funcName: "link",
                docs: "Construct a link. By using the 'special' visualisation notation, translations should be easier",
                args: [
                    {
                        name: "text",
                        doc: "Text to be shown",
                        required: true
                    },
                    {
                        name: "href",
                        doc: "The URL to link to. Note that this will be URI-encoded before ",
                        required: true
                    },
                    {
                        name: "class",
                        doc: "CSS-classes to add to the element"
                    },
                    {
                        name: "download",
                        doc: "Expects a string which denotes the filename to download the contents of `href` into. If set, this link will act as a download-button."
                    },
                    {
                        name: "arialabel",
                        doc: "If set, this text will be used as aria-label"
                    },
                    {
                        name: "icon",
                        doc: "If set, show this icon next to the link. You might want to combine this with `class: button`"
                    }
                ],

                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    args: string[]
                ): SvelteUIElement {
                    let [text, href, classnames, download, ariaLabel, icon] = args
                    if (download === "") {
                        download = undefined
                    }
                    const newTab = download === undefined && !href.startsWith("#")
                    const textStore = tagSource.map((tags) => Utils.SubstituteKeys(text, tags))
                    const hrefStore = tagSource.map((tags) => Utils.SubstituteKeys(href, tags))
                    return new SvelteUIElement(DynLink, {
                        text: textStore,
                        href: hrefStore,
                        classnames: new ImmutableStore(classnames),
                        download: tagSource.map((tags) => Utils.SubstituteKeys(download, tags)),
                        ariaLabel: tagSource.map((tags) => Utils.SubstituteKeys(ariaLabel, tags)),
                        newTab: new ImmutableStore(newTab),
                        icon: tagSource.map((tags) => Utils.SubstituteKeys(icon, tags))
                    }).setSpan()
                }
            },
            {
                funcName: "multi",
                docs: "Given an embedded tagRendering (read only) and a key, will read the keyname as a JSON-list. Every element of this list will be considered as tags and rendered with the tagRendering",
                example:
                    "```json\n" +
                    JSON.stringify(
                        {
                            render: {
                                special: {
                                    type: "multi",
                                    key: "_doors_from_building_properties",
                                    tagrendering: {
                                        en: "The building containing this feature has a <a href='#{id}'>door</a> of width {entrance:width}"
                                    }
                                }
                            }
                        },
                        null,
                        "  "
                    ) +
                    "\n```",
                args: [
                    {
                        name: "key",
                        doc: "The property to read and to interpret as a list of properties",
                        required: true
                    },
                    {
                        name: "tagrendering",
                        doc: "An entire tagRenderingConfig",
                        required: true
                    },
                    {
                        name: "classes",
                        doc: "CSS-classes to apply on every individual item. Seperated by `space`"
                    }
                ],
                constr(
                    state: SpecialVisualizationState,
                    featureTags: UIEventSource<Record<string, string>>,
                    args: string[],
                    feature: Feature,
                    layer: LayerConfig
                ) {
                    const [key, tr, classesRaw] = args
                    let classes = classesRaw ?? ""
                    const translation = new Translation({ "*": tr })
                    return new VariableUiElement(
                        featureTags.map((tags) => {
                            let properties: object[]
                            if (typeof tags[key] === "string") {
                                properties = JSON.parse(tags[key])
                            } else {
                                properties = <any>tags[key]
                            }
                            if (!properties) {
                                console.debug(
                                    "Could not create a special visualization for multi(",
                                    args.join(", ") + ")",
                                    "no properties found for object",
                                    feature.properties.id
                                )
                                return undefined
                            }
                            const elements = []
                            for (const property of properties) {
                                const subsTr = new SvelteUIElement(SpecialTranslation, {
                                    t: translation,
                                    tags: new ImmutableStore(property),
                                    state,
                                    feature,
                                    layer
                                    // clss: classes ?? "",
                                }).SetClass(classes)
                                elements.push(subsTr)
                            }
                            return elements
                        })
                    )
                }
            },
            {
                funcName: "translated",
                docs: "If the given key can be interpreted as a JSON, only show the key containing the current language (or 'en'). This specialRendering is meant to be used by MapComplete studio and is not useful in map themes",

                args: [
                    {
                        name: "key",
                        doc: "The attribute to interpret as json",
                        defaultValue: "value"
                    }
                ],
                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    argument: string[],
                ): BaseUIElement {
                    return new VariableUiElement(
                        tagSource.map((tags) => {
                            const v = tags[argument[0] ?? "value"]
                            try {
                                const tr = typeof v === "string" ? JSON.parse(v) : v
                                return new Translation(tr).SetClass("font-bold")
                            } catch (e) {
                                console.error("Cannot create a translation for", v, "due to", e)
                                return JSON.stringify(v)
                            }
                        })
                    )
                }
            },
            {
                funcName: "fediverse_link",
                docs: "Converts a fediverse username or link into a clickable link",
                args: [
                    {
                        name: "key",
                        doc: "The attribute-name containing the link",
                        required: true
                    }
                ],

                constr(
                    state: SpecialVisualizationState,
                    tags: UIEventSource<Record<string, string>>,
                    argument: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    const key = argument[0]
                    return new SvelteUIElement(FediverseLink, { key, tags, state })
                }
            },
            {
                funcName: "braced",
                docs: "Show a literal text within braces",

                args: [
                    {
                        name: "text",
                        required: true,
                        doc: "The value to show"
                    }
                ],
                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    args: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    return new FixedUiElement("{" + args[0] + "}")
                }
            },
            {
                funcName: "tags",
                docs: "Shows a (json of) tags in a human-readable way + links to the wiki",

                args: [
                    {
                        name: "key",
                        defaultValue: "value",
                        doc: "The key to look for the tags"
                    }
                ],
                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    argument: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    const key = argument[0] ?? "value"
                    return new VariableUiElement(
                        tagSource.map((tags) => {
                            let value = tags[key]
                            if (!value) {
                                return new FixedUiElement("No tags found").SetClass("font-bold")
                            }
                            if (typeof value === "string" && value.startsWith("{")) {
                                value = JSON.parse(value)
                            }
                            try {
                                const parsed = TagUtils.Tag(value)
                                return parsed.asHumanString(true, false, {})
                            } catch (e) {
                                return new FixedUiElement(
                                    "Could not parse this tag: " +
                                    JSON.stringify(value) +
                                    " due to " +
                                    e
                                ).SetClass("alert")
                            }
                        })
                    )
                }
            },

            {
                funcName: "direction_indicator",
                args: [],

                docs: "Gives a distance indicator and a compass pointing towards the location from your GPS-location. If clicked, centers the map on the object",
                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    argument: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    return new SvelteUIElement(DirectionIndicator, { state, feature })
                }
            },

            {
                funcName: "direction_absolute",
                docs: "Converts compass degrees (with 0° being north, 90° being east, ...) into a human readable, translated direction such as 'north', 'northeast'",
                args: [
                    {
                        name: "key",
                        doc: "The attribute containing the degrees",
                        defaultValue: "_direction:centerpoint"
                    }
                ],

                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    args: string[]
                ): BaseUIElement {
                    const key = args[0] === "" ? "_direction:centerpoint" : args[0]
                    return new VariableUiElement(
                        tagSource
                            .map((tags) => {
                                console.log("Direction value", tags[key], key)
                                return tags[key]
                            })
                            .mapD((value) => {
                                const dir = GeoOperations.bearingToHuman(
                                    GeoOperations.parseBearing(value)
                                )
                                console.log("Human dir", dir)
                                return Translations.t.general.visualFeedback.directionsAbsolute[dir]
                            })
                    )
                }
            },
            {
                funcName: "compare_data",
                needsUrls: (args) => args[1].split(";"),
                args: [
                    {
                        name: "url",
                        required: true,
                        doc: "The attribute containing the url where to fetch more data"
                    },
                    {
                        name: "host",
                        required: true,
                        doc: "The domain name(s) where data might be fetched from - this is needed to set the CSP. A domain must include 'https', e.g. 'https://example.com'. For multiple domains, separate them with ';'. If you don't know the possible domains, use '*'. "
                    },
                    {
                        name: "readonly",
                        required: false,
                        doc: "If 'yes', will not show 'apply'-buttons"
                    }
                ],
                docs: "Gives an interactive element which shows a tag comparison between the OSM-object and the upstream object. This allows to copy some or all tags into OSM",
                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    args: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    const url = args[0]
                    const readonly = args[3] === "yes"
                    const externalData = Stores.FromPromiseWithErr(Utils.downloadJson(url))
                    return new SvelteUIElement(ComparisonTool, {
                        url,
                        state,
                        tags: tagSource,
                        layer,
                        feature,
                        readonly,
                        externalData
                    })
                }
            },
            {
                funcName: "linked_data_from_website",
                docs: "Attempts to load (via a proxy) the specified website and parsed ld+json from there. Suitable data will be offered to import into OSM",
                args: [
                    {
                        name: "key",
                        defaultValue: "website",
                        doc: "Attempt to load ld+json from the specified URL. This can be in an embedded <script type='ld+json'>"
                    },
                    {
                        name: "useProxy",
                        defaultValue: "yes",
                        doc: "If 'yes', uses the provided proxy server. This proxy server will scrape HTML and search for a script with `lang='ld+json'`. If `no`, the data will be downloaded and expects a linked-data-json directly"
                    },
                    {
                        name: "host",
                        doc: "If not using a proxy, define what host the website is allowed to connect to"
                    },
                    {
                        name: "mode",
                        doc: "If `display`, only show the data in tabular and readonly form, ignoring already existing tags. This is used to explicitly show all the tags. If unset or anything else, allow to apply/import on OSM"
                    },
                    {
                        name: "collapsed",
                        defaultValue: "yes",
                        doc: "If the containing accordion should be closed"
                    }
                ],
                needsUrls: [Constants.linkedDataProxy, "http://www.schema.org"],
                constr(
                    state: SpecialVisualizationState,
                    tags: UIEventSource<Record<string, string>>,
                    argument: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    const key = argument[0] ?? "website"
                    const useProxy = argument[1] !== "no"
                    const readonly = argument[3] === "readonly"
                    const isClosed = (argument[4] ?? "yes") === "yes"

                    const countryStore: Store<string | undefined> = tags.mapD(
                        (tags) => tags._country
                    )
                    const sourceUrl: Store<string | undefined> = tags.mapD((tags) => {
                        if (!tags[key] || tags[key] === "undefined") {
                            return null
                        }
                        return tags[key]
                    })
                    const externalData: Store<{ success: GeoJsonProperties } | { error: any }> =
                        sourceUrl.bindD(
                            (url) => {
                                const country = countryStore.data
                                if (url.startsWith("https://data.velopark.be/")) {
                                    return Stores.FromPromiseWithErr(
                                        (async () => {
                                            try {
                                                const loadAll =
                                                    layer.id.toLowerCase().indexOf("maproulette") >=
                                                    0 // Dirty hack
                                                const features =
                                                    await LinkedDataLoader.fetchVeloparkEntry(
                                                        url,
                                                        loadAll
                                                    )
                                                const feature =
                                                    features.find(
                                                        (f) => f.properties["ref:velopark"] === url
                                                    ) ?? features[0]
                                                const properties = feature.properties
                                                properties["ref:velopark"] = url
                                                console.log(
                                                    "Got properties from velopark:",
                                                    properties
                                                )
                                                return properties
                                            } catch (e) {
                                                console.error(e)
                                                throw e
                                            }
                                        })()
                                    )
                                }
                                if (country === undefined) {
                                    return undefined
                                }
                                return Stores.FromPromiseWithErr(
                                    (async () => {
                                        try {
                                            return await LinkedDataLoader.fetchJsonLd(
                                                url,
                                                { country },
                                                useProxy ? "proxy" : "fetch-lod"
                                            )
                                        } catch (e) {
                                            console.log(
                                                "Could not get with proxy/download LOD, attempting to download directly. Error for ",
                                                url,
                                                "is",
                                                e
                                            )
                                            return await LinkedDataLoader.fetchJsonLd(
                                                url,
                                                { country },
                                                "fetch-raw"
                                            )
                                        }
                                    })()
                                )
                            },
                            [countryStore]
                        )

                    externalData.addCallbackAndRunD((lod) =>
                        console.log("linked_data_from_website received the following data:", lod)
                    )

                    return new Toggle(
                        new SvelteUIElement(ComparisonTool, {
                            feature,
                            state,
                            tags,
                            layer,
                            externalData,
                            sourceUrl,
                            readonly,
                            collapsed: isClosed
                        }),
                        undefined,
                        sourceUrl.map((url) => !!url)
                    )
                }
            },

            {
                funcName: "preset_description",
                docs: "Shows the extra description from the presets of the layer, if one matches. It will pick the most specific one (e.g. if preset `A` implies `B`, but `B` does not imply `A`, it'll pick B) or the first one if no ordering can be made. Might be empty",
                args: [],
                constr(
                    state: SpecialVisualizationState,
                    tagSource: UIEventSource<Record<string, string>>,
                    argument: string[],
                    feature: Feature,
                    layer: LayerConfig
                ): BaseUIElement {
                    const translation = tagSource.map((tags) => {
                        const layer = state.theme.getMatchingLayer(tags)
                        return layer?.getMostMatchingPreset(tags)?.description
                    })
                    return new VariableUiElement(translation)
                }
            },


            {
                funcName: "group",
                docs: "A collapsable group (accordion)",
                args: [
                    {
                        name: "header",
                        doc: "The _identifier_ of a single tagRendering. This will be used as header"
                    },
                    {
                        name: "labels",
                        doc: "A `;`-separated list of either identifiers or label names. All tagRenderings matching this value will be shown in the accordion"
                    }
                ],
                constr(
                    state: SpecialVisualizationState,
                    tags: UIEventSource<Record<string, string>>,
                    argument: string[],
                    selectedElement: Feature,
                    layer: LayerConfig
                ): SvelteUIElement {
                    const [header, labelsStr] = argument
                    const labels = labelsStr.split(";").map((x) => x.trim())
                    return new SvelteUIElement<any, any, any>(GroupedView, {
                        state,
                        tags,
                        selectedElement,
                        layer,
                        header,
                        labels
                    })
                }
            },
            {
                funcName: "preset_type_select",
                docs: "An editable tag rendering which allows to change the type",
                args: [],
                constr(
                    state: SpecialVisualizationState,
                    tags: UIEventSource<Record<string, string>>,
                    argument: string[],
                    selectedElement: Feature,
                    layer: LayerConfig
                ): SvelteUIElement {
                    const t = Translations.t.preset_type
                    const question: QuestionableTagRenderingConfigJson = {
                        id: layer.id + "-type",
                        question: t.question.translations,
                        mappings: layer.presets.map((pr) => ({
                            if: new And(pr.tags).asJson(),
                            icon: "auto",
                            then: (pr.description ? t.typeDescription : t.typeTitle).Subs({
                                title: pr.title,
                                description: pr.description
                            }).translations
                        }))
                    }
                    const config = new TagRenderingConfig(question)
                    return new SvelteUIElement(TagRenderingEditable, {
                        config,
                        tags,
                        selectedElement,
                        state,
                        layer
                    })
                }
            }

        ]

        specialVisualizations.push(new AutoApplyButton(specialVisualizations))

        const regex = /[a-zA-Z_]+/
        const invalid = specialVisualizations
            .map((sp, i) => ({ sp, i }))
            .filter((sp) => sp.sp.funcName === undefined || !sp.sp.funcName.match(regex))

        if (invalid.length > 0) {
            throw (
                "Invalid special visualisation found: funcName is undefined or doesn't match " +
                regex +
                invalid.map((sp) => sp.i).join(", ") +
                ". Did you perhaps type \n  funcName: \"funcname\" // type declaration uses COLON\ninstead of:\n  funcName = \"funcName\" // value definition uses EQUAL"
            )
        }

        const allNames = specialVisualizations.map((f) => f.funcName)
        const seen = new Set<string>()
        for (let name of allNames) {
            name = name.toLowerCase()
            if (seen.has(name)) {
                throw "Invalid special visualisations: detected a duplicate name: " + name
            }
            seen.add(name)
        }

        return specialVisualizations
    }
}